JP7741266B2 - Sleeve and through-hole structure - Google Patents

Description

The present invention relates to a sleeve, a through-hole structure, and a sleeve installation method.

In order to pass a penetrating member through a through hole that penetrates a partition wall of a building in the wall thickness direction, a sleeve is arranged in the through hole of the partition wall (see, for example, Patent Document 1).
As shown in Figure 21, a large-sized opening 111a is formed in one wall panel 111 of a hollow wall 110 serving as a partition wall, and a small-sized opening 112a is formed in the other wall panel 112. A through hole 114 formed in the hollow wall 110 is formed by the large-sized opening 111a and the small-sized opening 112a communicating with each other via an internal space 113 between the two wall panels 111, 112. The small-sized opening 112a is of a size necessary to pass a cable, which is an example of a penetration member, through. The large-sized opening 111a and the small-sized opening 112a are each rectangular holes and similar in shape to each other.

The frame 115, which serves as a sleeve and is placed in the through-hole 114, has a rectangular cylindrical tube portion 116, a rectangular frame-shaped large flange portion 117, and a rectangular frame-shaped small flange portion 118. The tube portion 116 is sized to fit into the large-size opening 111a. The tube portion 116 is slightly larger than the small-size opening 112a.

The large flange portion 117 is connected to one axial edge of the tubular portion 116. The outer peripheral edge of the large flange portion 117 is slightly larger than the large-size opening 111a. The outer peripheral edge of the small flange portion 118 is connected to the other axial edge of the tubular portion 116. The inner peripheral edge of the small flange portion 118 is the same size as or slightly larger than the small-size opening 112a.

The frame 115 is inserted through the large opening 111a in the through-hole 114. The large flange 117 is in close contact with the outer surface of one wall panel 111. The small flange 118 is in close contact with the inner surface of the other wall panel 112. The frame 115 prevents small animals and flames from entering the internal space 113 through the large opening 111a and the small opening 112a. Wiring and piping materials are inserted into the frame 115.

Japanese Patent Application Laid-Open No. 2006-104738

However, through holes 114 of various sizes are formed in the hollow wall 110. In order to match the size of the frame body 115 to the size of the through holes 114 that are formed, it is necessary to prepare multiple types of frame bodies 115 of different sizes. Alternatively, if a single size frame body 115 is used, it is necessary to form the through holes 114 to match the size of the frame body 115.

The sleeve that solves the above problem is a sleeve that penetrates a partition wall in the wall thickness direction and surrounds a penetrating member that is placed inside a through hole that is square when viewed in the wall thickness direction. It has a peripheral wall formed into a square frame by combining multiple peripheral wall components made of metal plate. The peripheral wall components have four bending members and two or four straight portion forming members. If the direction in which the internal space surrounded by the peripheral wall opens is defined as the penetrating direction of the peripheral wall, each of the four bending members is L-shaped when viewed along the penetrating direction and is made of metal plate with a constant width in the penetrating direction. The peripheral wall has a corner forming portion and two plate portions that protrude perpendicularly from the corner forming portion and have a constant width in the protruding direction, the straight portion forming body has a shape that extends at the constant width, the peripheral wall has four side walls, and at least two of the four side walls are composed of a tip end of the plate portion of one of two bending members located apart in the circumferential direction of the peripheral wall, a tip end of the other plate portion, and the straight portion forming body overlapping both tip ends in the plate thickness direction so as to connect the two tip ends, and the internal space can be expanded or contracted by changing the overlap length in the protruding direction.

Regarding the sleeve, the peripheral wall has a rectangular frame-shaped flange that protrudes outward from one end edge in the penetration direction, and all of the multiple peripheral wall constituent bodies have plate-shaped flange forming portions that form the flanges at one end edge in the penetration direction, and two adjacent flange forming portions in the circumferential direction are overlapped in the plate thickness direction of the flange forming portions, the peripheral wall has two sets of two opposing side walls in the four side walls, each of the two side walls in one set is composed of two bending members and one straight portion forming body, and each of the side walls in the other set is composed of two bending members of one set that face each other across the internal space, and the two bending members positioned circumferentially apart in one of the two side walls in one set are The outer polymer is polymerized on the outside of the rectangular frame shape of the first straight portion forming body connecting the two bending members, and the flange forming portion is polymerized on the other edge side in the penetration direction of the flange forming portion of the first straight portion forming body. In the other of the two side walls of one of the sets, the two bending members positioned apart in the circumferential direction are polymerized on the inside of the rectangular frame shape of the second straight portion forming body connecting the two bending members, and the flange forming portion is polymerized on one edge side in the penetration direction of the flange forming portion of the second straight portion forming body. In each of the two side walls of the other set, the tip end of the plate portion of the outer polymer is polymerized outward of the tip end of the plate portion of the inner polymer.

For the sleeve, the peripheral wall has the flange on the other end edge in the penetration direction, and all four of the bending members have the flange-forming portion on the other end edge in the penetration direction. When the peripheral wall is composed only of the four bending members, and each of the two side walls in one set and each of the two side walls in the other set are composed of two bending members, it is preferable that the outer polymer and the inner polymer in one set face each other across the internal space, and the outer polymer and the inner polymer in the other set face each other across the internal space.

The sleeve for solving the above problem is a sleeve that penetrates a partition wall in the wall thickness direction and surrounds a penetrating member that is placed inside a through hole that is square when viewed in the wall thickness direction. It has a square-frame-shaped peripheral wall formed by combining multiple peripheral wall constituents, and the direction of penetration is the direction in which the internal space surrounded by the peripheral wall opens. Each of the peripheral wall constituents is made of a metal plate having a plate portion with a constant width in the penetration direction. The peripheral wall has a square-frame-shaped flange that protrudes outward from one edge of the peripheral wall in the penetration direction, and all of the multiple peripheral wall constituents have a plate-shaped flange-forming portion that forms the flange at one edge of the penetration direction. The flange forming portions of the two mating peripheral wall constituents are overlapped in the plate thickness direction of the flange forming portions, one of the overlapping flange forming portions is formed in a stepped shape in the plate thickness direction, and the other of the overlapping flange forming portions overlaps with the stepped portion of one of the flange forming portions, so that the overlapping flange forming portions are flush with each other, the peripheral wall has four side walls, and each side wall is formed by overlapping, in the plate thickness direction, a tip end portion of one of at least two peripheral wall constituents adjacent to each other in the circumferential direction of the peripheral wall, and the internal space can be expanded or contracted by changing the overlap length of the peripheral walls in the circumferential direction.

In the sleeve, the flange forming portions adjacent to each other in the circumferential direction may be arranged in a stacking order in the plate thickness direction that is alternated in the circumferential direction.
With regard to the sleeve, it is preferable that the length from the base end to the tip end of one of the two plate portions of the peripheral wall constituent body is different from the length from the base end to the tip end of the other plate portion.

The sleeve preferably has an outer blocking member that has a thickness greater than the thickness dimension of the peripheral wall constituent member and is compressible and deformable in the thickness direction by an amount equal to or greater than the thickness of the peripheral wall constituent member.

The through-hole structure for solving the above problems is characterized in that a penetrating member is disposed within a through-hole that penetrates a partition wall in the wall thickness direction and is rectangular when viewed in the wall thickness direction, and the penetrating member is surrounded by a sleeve as described in any one of claims 1 to 7 that is disposed within the through-hole, the sleeve having a rectangular frame shape formed by combining multiple peripheral wall constituents, each of which is made of a metal plate having a constant width in the penetration direction, two peripheral wall constituents adjacent to each other in the circumferential direction of the peripheral wall overlap at their tip ends in the plate thickness direction of the peripheral wall constituents, and an outer blocking member that is compressively deformed in the plate thickness direction of the peripheral wall constituents is disposed between the overlapping peripheral wall constituents and the inner surface of the through-hole.

The through-hole structure for solving the above problems is characterized in that a penetrating member is disposed in a through-hole that penetrates a hollow wall formed by a pair of partition walls that form a cavity therebetween in the wall thickness direction and is rectangular when viewed in the wall thickness direction, and the penetrating member is surrounded by a sleeve as described in any one of claims 1 to 7 that is disposed in the through-hole, each of the multiple peripheral wall constituents is made of a metal plate having a constant width in the penetration direction that is greater than the wall thickness of the hollow wall, and two peripheral wall constituents that are adjacent in the circumferential direction of the peripheral wall are positioned in the hollow wall with their tip ends overlapping in the plate thickness direction of the peripheral wall constituents.

In the through-hole structure, one end of the sleeve in the penetration direction protrudes from the surface of the partition wall, and the sleeve is positioned relative to the partition wall by positioning tape affixed across the outer surface of the sleeve protruding from the partition wall and the surface of the partition wall.

A sleeve installation method for solving the above problems is a sleeve installation method that penetrates a partition wall in the wall thickness direction and surrounds a penetrating member that is placed within a through hole that is square when viewed in the wall thickness direction. The sleeve has a peripheral wall formed by combining four peripheral wall components into a rectangular frame shape, and where the direction in which the internal space enclosed by the peripheral wall opens is the penetration direction and the direction in which the internal space is enclosed is the circumferential direction, the sleeve is L-shaped when viewed along the penetration direction and is made of metal plate with a constant width in the penetration direction, and the four peripheral wall components have an angular forming portion and two plate portions that protrude perpendicularly from the angular forming portion and have a constant width in the protruding direction, are arranged within the through hole, and multiple peripheral wall components are adjacent to each other so that the protruding direction extends in the circumferential direction, and of the two adjacent peripheral wall components, the tip of the plate portion of one peripheral wall component and the tip of the plate portion of the other peripheral wall component are overlapped in the plate thickness direction to form the sleeve with the peripheral wall.

The sleeve installation method for solving the above problem is a sleeve installation method that penetrates a partition wall in the wall thickness direction and surrounds a penetrating member that is placed inside a through hole that is rectangular when viewed in the wall thickness direction. The sleeve has a peripheral wall formed by combining four peripheral wall components into a rectangular frame shape. Along the inner surface of the through hole that penetrates the partition wall, an outer blocking member is placed that has a thickness greater than the dimension in the thickness direction of the peripheral wall components and is compressible and deformable in the thickness direction by an amount equal to or greater than the thickness of the peripheral wall components. If the direction in which the internal space surrounded by the peripheral wall opens is defined as the penetration direction and the direction in which the internal space is surrounded is defined as the circumferential direction, then: The peripheral wall constituent is L-shaped when viewed from the outside and made of a metal plate having a constant width in the through-hole direction, and has an angular portion and two plate portions that protrude perpendicularly from the angular portion and have a constant width in the protruding direction. A plurality of the peripheral wall constituents are arranged adjacent to each other so that the protruding direction extends in the circumferential direction. Of the two adjacent peripheral wall constituents, the tip end of the plate portion of one peripheral wall constituent and the tip end of the plate portion of the other peripheral wall constituent are overlapped in the thickness direction of the two tip ends, and the amount of overlap of the two tip ends is changed while compressing the outer blocking member, and the two tip ends are joined to form the sleeve having the peripheral wall.

This invention allows for flexible adaptation to through-hole sizes.

FIG. FIG. FIG. FIG. FIG. 10 is a perspective view showing the sleeve in a contracted state. FIG. 10 is a perspective view showing the state in which the outer blocking member is placed along the inner surface of the through hole. FIG. 10 is a front view of the state in which the outer blocking member is placed along the inner surface of the through hole. FIG. 10 is a perspective view showing a state in which a first bending member is disposed in a through hole. FIG. 10 is a front view showing a state in which the second bending member is disposed in the through hole. FIG. 10 is a front view showing the state in which the third bending member is placed in the through hole. FIG. 10 is a front view showing the state in which the sleeve is placed in the through hole. FIG. FIG. 10 is a front view showing a sleeve according to a second embodiment. FIG. 10A is a perspective view showing a sleeve of a third embodiment, and FIG. 10B is an enlarged view showing an overlapping portion of a flange forming portion. FIG. 10 is a perspective view showing components of a sleeve of a third embodiment. FIG. 10 is a plan view showing a sleeve according to a third embodiment. FIG. 10 is a plan view showing a sleeve of another example. FIG. 2 is a perspective view showing a first assembly and a second assembly. FIG. 10 is a front view showing another example of the sleeve. FIG. 1 illustrates the background art.

(First embodiment)
A first embodiment of the sleeve, the through-hole structure, and the sleeve installation method will be described below with reference to FIGS.

As shown in Figures 1 and 2, the fire-resistant hollow wall W serving as a partition wall is constructed from multiple lightweight steel members 10 and a first partition wall 11 and a second partition wall 12 erected on either side of the lightweight steel members 10. The first partition wall 11 and the second partition wall 12 are made of, for example, gypsum board.

A cavity S is formed between the first partition wall 11 and the second partition wall 12, which face each other with a lightweight steel member 10 in between. The fire-resistant hollow wall W has a through-hole 14 formed therein for passing a fluid pipe 13, an example of a penetrating member. The through-hole 14 penetrates the fire-resistant hollow wall W in the wall thickness direction. The wall thickness direction of the fire-resistant hollow wall W is the direction in which the first partition wall 11 and the second partition wall 12 are arranged side by side. Examples of penetrating members include wiring (control cables, coaxial cables, optical cables, etc.) and piping materials (flexible synthetic resin electrical conduits, steel electrical conduits, fluid pipes, etc.) installed within a building.

The fluid pipe 13 is covered with a cylindrical insulating material 17. A fire-resistant member 18 is wrapped around the insulating material 17. The fire-resistant member 18 is in the form of a rectangular sheet. The fire-resistant member 18 includes a thermally expandable fire-resistant material layer (not shown). The fire-resistant member 18 is wrapped around the insulating material 17 by being tightened around the fluid pipe 13 by wire 19.

The through hole 14 is formed by communication between the first hole 11a in the first partition wall 11, the second hole 12a in the second partition wall 12, and the cavity S. When viewed from the front of the first partition wall 11, the first hole 11a is rectangular, and when viewed from the front of the second partition wall 12, the second hole 12a is rectangular. The center point P1 of the first hole 11a and the center point P2 of the second hole 12a coincide in the wall thickness direction of the fireproof hollow wall W. The through hole 14 penetrates the fireproof hollow wall W in the wall thickness direction and is rectangular when viewed in the wall thickness direction.

Next, a through-hole structure in which the fluid pipe 13 passes through the through-hole 14 will be described.
Within the through hole 14, a rectangular frame-shaped sleeve 20 surrounds the fluid pipe 13 that is disposed through the through hole 14. The fluid pipe 13 is inserted into the sleeve 20, thereby penetrating the through hole 14 in the fireproof hollow wall W. A filler material 15 is filled between the inner surface of the sleeve 20 and the outer peripheral surface of the fluid pipe 13, with the insulating material 17 and the fire-resistant member 18 interposed therebetween. The filler material 15 seals the gap between the inner surface of the sleeve 20 and the outer peripheral surface of the fluid pipe 13, with the insulating material 17 and the fire-resistant member 18 interposed therebetween. The filler material 15 is made of a flame-retardant, thermally expandable, heat-resistant material, but may also be made of a non-flammable, thermally expandable material, or may not have thermal expandability.

An outer blocking member 16 is disposed between the inner surface of the first hole 11a and the outer surface of the sleeve 20, and between the inner surface of the second hole 12a and the outer surface of the sleeve 20. The outer blocking member 16 is formed from non-breathable rock wool. However, the material of the outer blocking member 16 can be changed as appropriate as long as it is made from a non-flammable material such as ceramic wool. The outer blocking member 16 is in the form of a long, thin strip and a sheet. The outer blocking member 16 is formed by cutting a large sheet-shaped outer blocking member 16, but a pre-formed long, thin sheet may also be used.

As shown in Figure 6, the dimension of the outer blocking member 16 in the short side direction is equal to or greater than the wall thickness of the first partition wall 11 and the wall thickness of the second partition wall 12. However, if the dimension of the outer blocking member 16 in the short side direction is greater than the wall thickness of the first partition wall 11 and the wall thickness of the second partition wall 12, the outer blocking member 16 protrudes toward the cavity S and does not protrude toward the front side of the fire-resistant hollow wall W.

The direction perpendicular to the short and long sides of the outer blocking member 16 is defined as the thickness direction, and the dimension of the outer blocking member 16 in the thickness direction is defined as the thickness. The outer blocking member 16 is compressible and deformable in the thickness direction, and its thickness can be reduced by compression.

As shown in FIG. 2 , an outer blocking member 16 is disposed along the inner surface of the first hole 11a in the first partition wall 11 and the inner surface of the second hole 12a in the second partition wall 12. The outer blocking member 16 disposed in the first hole 11a blocks the gap between the inner surface of the first hole 11a and the outer surface of the sleeve 20 facing that inner surface. The outer blocking member 16 disposed in the second hole 12a blocks the gap between the inner surface of the second hole 12a and the outer surface of the sleeve 20 facing that inner surface. The outer blocking member 16 is compressed in the thickness direction between the inner surfaces of the holes 11a, 12a and the outer surface of the sleeve 20. The compressed and deformed outer blocking member 16 returns to its original shape, deforming along and contacting the inner surfaces of the holes 11a, 12a and the outer surface of the sleeve 20. In other words, the outer blocking member 16 blocks the gap between the inner surfaces of the holes 11a, 12a and the outer surface of the sleeve 20 without leaving any gaps.

The through hole 14 in the fireproof hollow wall W is sealed using a filler material 15, an outer sealing member 16, and a sleeve 20. In other words, the filler material 15, the outer sealing member 16, and the sleeve 20 form a through hole structure that seals the through hole 14.

Next, the sleeve 20 will be described.
3 and 5, the sleeve 20 includes a peripheral wall 21 configured into a rectangular frame shape by combining four bending members 30, which are an example of a peripheral wall constructing body. The sleeve 20 in Fig. 5 is a reduced-size version of the sleeve 20 shown in Fig. 3.

An internal space K is defined inside the peripheral wall 21. The direction in which the central axis L of the peripheral wall 21 extends is the direction in which the internal space K opens, and the direction in which the central axis L extends is referred to as the penetration direction Z. The peripheral wall 21 has four side walls 22 and corners 23 formed at the intersections of adjacent side walls 22. Each of the four side walls 22 is in the shape of a rectangular plate. The direction in which the peripheral wall 21 surrounds the internal space K is referred to as the circumferential direction.

Next, a description will be given of the bending members 30. Since the four bending members 30 have the same shape and size, a specific description will be given of one bending member 30.
As shown in Figure 4, the bending member 30 is formed by bending a metal plate having an elongated rectangular shape when viewed in the plate thickness direction into an L-shape. The bending member 30 has a rectangular first plate portion 31, a second plate portion 32 perpendicular to the first plate portion 31, and a corner-forming portion 33 located at the intersection of the first plate portion 31 and the second plate portion 32. Therefore, the bending member 30 is made of a metal plate that is L-shaped when viewed along the penetration direction Z and has a constant width in the penetration direction Z. The bending member 30 also has the corner-forming portion 33 and two plate portions that protrude perpendicularly from the corner-forming portion 33 in the protruding direction and have a constant width in the protruding direction, one of which is the first plate portion 31 and the other is the second plate portion 32.

The first plate portion 31 has a rectangular first inner surface 31a on one side in the thickness direction, and a rectangular first outer surface 31b on the other side in the thickness direction. The second plate portion 32 has a rectangular second inner surface 32a on one side in the thickness direction, and a rectangular second outer surface 32b on the other side in the thickness direction.

The first inner surface 31a of the first plate portion 31 is perpendicular to the second inner surface 32a of the second plate portion 32. The first outer surface 31b of the first plate portion 31 is perpendicular to the second outer surface 32b of the second plate portion 32. When the first plate portion 31 is viewed in the thickness direction, the direction in which the long sides of the first inner surface 31a and the first outer surface 31b extend is defined as the first direction H1 of the first plate portion 31. The first direction H1 is the direction in which the two long edges of the first plate portion 31 extend. The first direction H1 is the protruding direction in which the first plate portion 31 protrudes from the second plate portion 32.

When the second plate portion 32 is viewed in the thickness direction, the direction in which the short sides of the second inner surface 32a and the second outer surface 32b extend is the second direction H2 of the second plate portion 32. The second direction H2 is the direction in which the two short edges of the second plate portion 32 extend. The second direction H2 is the protruding direction in which the second plate portion 32 protrudes from the first plate portion 31.

The direction in which the short sides of the first inner surface 31a and the first outer surface 31b extend is the same as the direction in which the long sides of the second inner surface 32a and the second outer surface 32b extend, and these directions are referred to as the width direction H3. The dimension of the first plate portion 31 in the width direction H3 is constant in the first direction H1. Therefore, the first plate portion 31 has a constant width that does not change along the first direction H1, which is the direction in which the first plate portion 31 protrudes from the corner forming portion 33. The dimension of the second plate portion 32 in the width direction H3 is constant in the second direction H2. Therefore, the second plate portion 32 has a constant width that does not change along the second direction H2, which is the direction in which the second plate portion 32 protrudes from the corner forming portion 33. The dimension of the first plate portion 31 in the width direction H3 is equal to the dimension of the second plate portion 32 in the width direction H3. The dimension from the base end to the tip of the first plate portion 31 along the first direction H1 is longer than the dimension from the base end to the tip of the second plate portion 32 along the second direction H2. In other words, the dimension of the first plate portion 31 along the first direction H1 is different from the dimension of the second plate portion 32 along the second direction H2.

The corner forming portion 33 is the area where the first plate portion 31 and the second plate portion 32 intersect. In the bending member 30, the base ends of the first plate portion 31 and the second plate portion 32 are located at the corner forming portion 33, at the boundary between the first plate portion 31 and the second plate portion 32. In the first plate portion 31, the edge located at the tip of the first plate portion 31 is referred to as the first tip edge 31c, and the edge located at the tip of the second plate portion 32 is referred to as the second tip edge 32c. The first tip edge 31c and the second tip edge 32c are thin in the plate thickness direction and have a dimension in the width direction H3 that is greater than the dimension in the plate thickness direction.

As described above, the peripheral wall 21 is formed by combining four of the bending members 30. Specifically, as shown in Figure 3 or Figure 5, the peripheral wall 21 is formed by arranging the four bending members 30 to form a square frame. The four corners 23 of the peripheral wall 21 are formed by the corner-forming portions 33 of the four bending members 30.

Each side wall 22 is formed by combining the first plate portion 31 of one of two circumferentially adjacent bending members 30 with the second plate portion 32 of the other. In other words, each side wall 22 is formed by overlapping the tip end of the first plate portion 31 of one circumferentially adjacent bending member 30 with the tip end of the second plate portion 32 of the other sleeve 20 in the plate thickness direction.

Here, the reference method refers to a method of forming the peripheral wall 21 while forming the side wall 22 by butting the first tip edge 31c of the first plate portion 31 against the second tip edge 32c of the second plate portion 32. Figure 3 shows the peripheral wall 21 formed using the reference method.

On the other hand, as shown in Figure 5, the reduction method involves aligning the tip of the first plate portion 31 of one of two adjacent bending members 30 with the tip of the second plate portion 32 of the other bending member 30, and overlapping the plate portions 31, 32 in the thickness direction to form the side wall 22 while forming the peripheral wall 21.

In this case, it is preferable to uniformly determine which of the first plate portion 31 and the second plate portion 32 is on the outside in the overlapping direction for each of the four side walls 22. However, it is optional which of the first plate portion 31 and the second plate portion 32 is on the outside in the overlapping direction. When the first plate portion 31 is on the outside of the second plate portion 32 in the overlapping direction, the first inner surface 31a contacts the second outer surface 32b, and when the second plate portion 32 is on the outside of the first plate portion 31 in the overlapping direction, the second inner surface 32a contacts the first outer surface 31b.

When four bending members 30 are combined to form a peripheral wall 21, if the side walls 22 are formed using the standard method, the circumferential dimension of each of the four side walls 22 will be maximum. On the other hand, if the side walls 22 are formed using the reduction method, the circumferential dimension of each of the four side walls 22 will be smaller than the side walls 22 formed using the standard method.

When the side wall 22 is formed using the reduction method, the greater the amount of overlap between the first plate portion 31 and the second plate portion 32 along the circumferential direction of the peripheral wall 21, the smaller the dimension of the side wall 22 in the circumferential direction of the peripheral wall 21. Furthermore, in peripheral walls 21 formed using the reduction method, the internal space K of the peripheral wall 21 can be expanded or contracted by increasing or decreasing the overlap length between the first plate portion 31 and the second plate portion 32.

The peripheral wall 21 has two sets of four side walls 22, each consisting of two opposing side walls 22, with the overlap length of each pair of side walls 22 being the same. If the overlap length of each pair is the same, the peripheral wall 21 will be formed into a square rectangular frame when viewed in the penetration direction Z. If the overlap length of each pair is different, the peripheral wall 21 will be formed into a rectangular rectangular frame when viewed in the penetration direction Z.

In each of the four side walls 22 of the peripheral wall 21, the tip of the first plate portion 31 and the tip of the second plate portion 32 are joined by a joining member 50. In this embodiment, the joining member 50 is aluminum tape.

In the standard method and reduced method, the joining member 50 is attached across the first inner surface 31a at the tip of the first plate portion 31 and the second inner surface 32a at the tip of the second plate portion 32, or across the first outer surface 31b at the tip of the first plate portion 31 and the second outer surface 32b at the tip of the second plate portion 32. In the peripheral wall 21, each side wall 22 has one location where the tip of the first plate portion 31 and the tip of the second plate portion 32 overlap or adjoin. Therefore, there are four locations on the peripheral wall 21 where the two bending members 30 are joined by the joining member 50.

The four bending members 30 are assembled together by joining two adjacent bending members 30 with joining members 50, maintaining the rectangular frame shape of the peripheral wall 21. Therefore, the four joining members 50 function as retaining members that maintain the shape of the peripheral wall 21. The sleeve 20 is composed of the peripheral wall 21 formed from the four bending members 30 and the four joining members 50.

As shown in Figure 3, when the peripheral wall 21 is formed using the standard method, the first plate portion 31 and the second plate portion 32 that are adjacent in the circumferential direction on each side wall 22 are joined by the joining member 50 with the first leading edge 31c and the second leading edge 32c abutting against each other. Even when the peripheral wall 21 is formed using the standard method, the surfaces of the first plate portion 31 and the second plate portion 32 to which the joining member 50 is attached can be selected appropriately.

The dimension of the peripheral wall 21 in the penetration direction Z is greater than the wall thickness of the fireproof hollow wall W. Therefore, when the sleeve 20 is placed in the through hole 14, both ends of the peripheral wall 21 in the penetration direction Z can protrude from the fireproof hollow wall W. Each of the four corners 23 of the peripheral wall 21 is a right angle.

In the through-hole structure equipped with the sleeve 20 configured as described above, the outer blocking member 16 disposed within the first hole 11a blocks the gap between the inner surface of the first hole 11a and the first outer surface 31b and second outer surface 32b of each bending member 30 that face the inner surface. Furthermore, the outer blocking member 16 disposed within the second hole 12a blocks the gap between the inner surface of the second hole 12a and the first outer surface 31b and second outer surface 32b of each bending member 30 that face the inner surface.

The outer blocking member 16 is compressed in the thickness direction between the inner surfaces of each hole 11a, 12a and the first outer surface 31b and second outer surface 32b of each bending member 30. The compressed and deformed outer blocking member 16 returns to its original shape, deforming along and contacting the inner surfaces of each hole 11a, 12a and the first outer surface 31b and second outer surface 32b of each bending member 30.

In each side wall 22 of the peripheral wall 21 formed using the reduction method, when the second plate portion 32 overlaps the outside of the first plate portion 31, a step is formed between the first outer surface 31b, the second leading edge 32c, and the second outer surface 32b. When the first plate portion 31 overlaps the outside of the second plate portion 32, a step is formed between the second outer surface 32b, the first leading edge 31c, and the first outer surface 31b. The outer blocking member 16 deforms along and comes into contact with this step.

As described above, steps are formed in each side wall 22. However, if the joining members 50 are adhered to the first inner surface 31a and the second inner surface 32a, the number of contact points between the sleeve 20 and the outer blocking member 16 is reduced. Therefore, it is preferable to adhere the joining members 50 to the first inner surface 31a and the second inner surface 32a. Furthermore, if the peripheral wall 21 is formed using the shrinking method, the joining members 50 can be adhered to the first inner surface 31a and the second inner surface 32a after the four bending members 30 are placed inside the through hole 14. This makes it easier to match the size of the peripheral wall 21 to the through hole 14 and also makes it easier to determine the position where the outer blocking member 16 is compressed.

The outer blocking member 16 is strip-shaped and its dimension in the penetration direction Z is smaller than that of the bending member 30. Furthermore, the outer blocking member 16 has a thickness greater than the dimension in the plate thickness direction of the bending member 30, and in the through-hole structure, the outer blocking member 16 is compressed and deformed by an amount equal to or greater than the plate thickness of the bending member 30.

Next, a method for installing the sleeve 20 and a method for constructing the through-hole structure will be described.
First, a case will be described in which a through-hole structure is constructed while installing a sleeve 20 using the reduction method. As shown in Fig. 7, one of the four corners of the through-hole 14 is designated as a first corner 14a, another corner adjacent to the first corner 14a in the horizontal direction is designated as a second corner 14b, another corner adjacent to the second corner 14b in the vertical direction is designated as a third corner 14c, and another corner adjacent to the first corner 14a and the third corner 14c is designated as a fourth corner 14d.

Of the pair of inner surfaces of the through hole 14 that sandwich the first corner 14a, one of the inner surfaces located between the first corner 14a and the fourth corner 14d is referred to as the first inner surface 141, and the other inner surface is referred to as the second inner surface 142. Of the pair of inner surfaces of the through hole 14 that sandwich the second corner 14b, one inner surface is referred to as the second inner surface 142, and the other inner surface is referred to as the third inner surface 143. Of the pair of inner surfaces of the through hole 14 that sandwich the third corner 14c, one inner surface is referred to as the third inner surface 143, and the other inner surface is referred to as the fourth inner surface 144. Of the pair of inner surfaces of the through hole 14 that sandwich the fourth corner 14d, one inner surface is referred to as the fourth inner surface 144, and the other inner surface is referred to as the first inner surface 141.

The four bending members 30 forming the sleeve 20 are designated as a first bending member 30a, a second bending member 30b, a third bending member 30c, and a fourth bending member 30d.
First, as shown in Figures 6 and 7, outer blocking members 16 are placed along the four sides of the inner surface of the first hole 11a of the first partition wall 11. Similarly, outer blocking members 16 are placed along the four sides of the inner surface of the second hole 12a. As a result, the inner surfaces of the first hole 11a and the second hole 12a are covered with the outer blocking members 16. The thickness of each outer blocking member 16 is greater than the plate thickness of the four bending members 30.

Next, as shown in Figures 8 and 9, the corner forming portion 33 of the first bending member 30a is placed inside the through hole 14, aligning it with the first corner 14a of the through hole 14. The second plate portion 32 of the first bending member 30a is placed along the first inner surface 141, and the first plate portion 31 of the first bending member 30a is placed along the second inner surface 142. At this time, the first bending member 30a is supported by the second inner surface 142 via the outer blocking member 16. In addition, a gap remains between the first tip edge 31c of the first bending member 30a and the third inner surface 143, with the outer blocking member 16 in between.

Next, the corner forming portion 33 of the second bending member 30b is placed inside the through-hole 14, aligned with the second corner 14b. The second plate portion 32 of the second bending member 30b is placed along the second inner surface 142, and the first plate portion 31 of the second bending member 30b is placed along the third inner surface 143.

At this time, the tip of the first plate portion 31 of the first bending member 30a and the second plate portion 32 of the second bending member 30b are overlapped in the thickness direction. This brings the first inner surface 31a of the first plate portion 31 of the first bending member 30a into contact with the second outer surface 32b of the second plate portion 32 of the second bending member 30b.

The overlap length of the first plate portion 31 and the second plate portion 32 is adjusted to match the longitudinal dimension of the second inner surface 142. At this time, the outer blocking member 16 arranged along the second inner surface 142 is compressed in the thickness direction by more than the plate thickness of the bending member 30 between the first outer surface 31b and first tip edge 31c of the first plate portion 31 of the first bending member 30a, and the second outer surface 32b of the second plate portion 32 of the second bending member 30b, and the second inner surface 142. Then, the first plate portion 31 of the first bending member 30a and the second plate portion 32 of the second bending member 30b are joined by the joining member 50.

Next, as shown in FIG. 10, the corner forming portion 33 of the third bending member 30c is placed inside the through hole 14, aligned with the third corner 14c. The second plate portion 32 of the third bending member 30c is placed along the third inner surface 143, and the first plate portion 31 of the third bending member 30c is placed along the fourth inner surface 144. At this time, the tip end of the first plate portion 31 of the second bending member 30b and the tip end of the second plate portion 32 of the third bending member 30c are overlapped in the thickness direction. This brings the first inner surface 31a of the first plate portion 31 of the second bending member 30b into contact with the second outer surface 32b of the second plate portion 32 of the third bending member 30c.

The overlap length of the first plate portion 31 and the second plate portion 32 is adjusted to match the longitudinal dimension of the third inner surface 143. At this time, the outer blocking member 16 arranged along the third inner surface 143 is compressed in the thickness direction by more than the plate thickness of the bending member 30 between the third inner surface 143 and the first outer surface 31b and first tip edge 31c of the first plate portion 31 of the second bending member 30b and the second outer surface 32b of the second plate portion 32 of the third bending member 30c. Then, the first plate portion 31 of the second bending member 30b and the second plate portion 32 of the third bending member 30c are joined by the joining member 50.

Next, as shown in FIG. 11 , the corner forming portion 33 of the fourth bending member 30d is placed inside the through hole 14, aligned with the fourth corner 14d. The second plate portion 32 of the fourth bending member 30d is placed along the fourth inner surface 144, and the first plate portion 31 of the fourth bending member 30d is placed along the first inner surface 141. At this time, the tip of the first plate portion 31 of the third bending member 30c and the second plate portion 32 of the fourth bending member 30d are overlapped in the thickness direction. This brings the first inner surface 31a of the first plate portion 31 of the third bending member 30c into contact with the second outer surface 32b of the second plate portion 32 of the fourth bending member 30d.

The overlap length of the first plate portion 31 and the second plate portion 32 is adjusted to match the longitudinal dimension of the fourth inner surface 144. At this time, the outer blocking member 16 arranged along the fourth inner surface 144 is compressed in the thickness direction by more than the plate thickness of the bending member 30 between the fourth inner surface 144 and the first outer surface 31b and first tip edge 31c of the first plate portion 31 of the third bending member 30c and the second outer surface 32b of the second plate portion 32 of the fourth bending member 30d. The first plate portion 31 of the third bending member 30c and the second plate portion 32 of the fourth bending member 30d are then joined by the joining member 50.

Furthermore, the outer blocking member 16 arranged along the first inner surface 141 is compressed in the thickness direction by more than the plate thickness of the bending member 30 between the first outer surface 31b and first tip edge 31c of the first plate portion 31 of the fourth bending member 30d and the second outer surface 32b of the second plate portion 32 of the first bending member 30a and the first inner surface 141. The first plate portion 31 of the fourth bending member 30d and the second plate portion 32 of the first bending member 30a are then joined by the joining member 50.

As a result, a peripheral wall 21 is formed within the through-hole 14 from the four bending members 30 and four connecting members 50, and the sleeve 20 is placed in place. The fluid pipe 13 is then inserted into the sleeve 20, completing the through-hole structure.

In the through-hole structure, a fluid pipe 13 is disposed in a through-hole 14 that penetrates the fire-resistant hollow wall W in the wall thickness direction and is rectangular when viewed in the wall thickness direction. In the through-hole structure, the fluid pipe 13 is surrounded by a sleeve 20 within the through-hole 14. The sleeve 20 has a rectangular frame-shaped peripheral wall 21 formed by combining four bending members 30. Each of the four side walls 22 has two bending members 30 arranged adjacent to each other in the circumferential direction of the peripheral wall 21, with the tips of two adjacent bending members 30 overlapping in the thickness direction of the bending members 30. In addition, in the through-hole structure, an outer blocking member 16 that is compressively deformed in the thickness direction of the bending members 30 is disposed between the overlapping bending members 30 and the inner surface of the through-hole 14.

The installation method for the sleeve 20 can be said to include the following steps. Specifically, the installation method for the sleeve 20 includes the steps of placing the first to fourth bending members 30a to 30d within the through hole 14 and arranging two bending members 30 adjacent to each other so that the protruding directions of the first plate portion 31 and the second plate portion 32 extend in the circumferential direction of the peripheral wall 21. The installation method for the sleeve 20 also includes the steps of overlapping the tip end of the first plate portion 31 of one bending member 30 with the tip end of the second plate portion 32 of the other bending member 30 in the thickness direction to form side walls 22, thereby forming a peripheral wall 21 with four side walls 22.

When forming the sleeve 20 using the standard method, the corner forming portion 33 of the first bending member 30a is positioned within the through hole 14 so that it is aligned with the first corner 14a of the through hole 14. The second plate portion 32 of the first bending member 30a is positioned along the first inner surface 141, and the first plate portion 31 of the first bending member 30a is positioned along the second inner surface 142. At this time, the first bending member 30a is supported by the second inner surface 142 via the outer blocking member 16.

Next, the corner forming portion 33 of the second bending member 30b is placed inside the through hole 14, aligned with the second corner 14b. The second plate portion 32 of the second bending member 30b is placed along the second inner surface 142, and the first plate portion 31 of the second bending member 30b is placed along the third inner surface 143. At this time, the first tip edge 31c of the first plate portion 31 of the first bending member 30a is butted against the second tip edge 32c of the second plate portion 32 of the second bending member 30b. The first plate portion 31 of the first bending member 30a and the second plate portion 32 of the second bending member 30b are joined using a joining member 50.

Next, the corner forming portion 33 of the third bending member 30c is placed within the through hole 14, aligned with the third corner 14c. The second plate portion 32 of the third bending member 30c is placed along the third inner surface 143, and the first plate portion 31 of the third bending member 30c is placed along the fourth inner surface 144. At this time, the first tip edge 31c of the first plate portion 31 of the second bending member 30b is butted against the second tip edge 32c of the second plate portion 32 of the third bending member 30c. The first plate portion 31 of the second bending member 30b and the second plate portion 32 of the third bending member 30c are joined using a joining member 50.

Next, the corner forming portion 33 of the fourth bending member 30d is placed inside the through hole 14 along the fourth corner 14d. The second plate portion 32 of the fourth bending member 30d is placed along the fourth inner surface 144, and the first plate portion 31 of the fourth bending member 30d is placed along the first inner surface 141.

At this time, the first tip edge 31c of the first plate portion 31 of the third bending member 30c is butted against the second tip edge 32c of the second plate portion 32 of the fourth bending member 30d. The first plate portion 31 of the third bending member 30c and the second plate portion 32 of the fourth bending member 30d are joined by a joining member 50.

Furthermore, the first tip edge 31c of the first plate portion 31 of the fourth bending member 30d is butted against the second tip edge 32c of the second plate portion 32 of the first bending member 30a. Then, the second plate portion 32 of the first bending member 30a and the first plate portion 31 of the fourth bending member 30d are joined with a joining member 50. As a result, a peripheral wall 21 is formed within the through hole 14, and the sleeve 20 is positioned therein.

Next, as shown in Figure 12, waterproof tape 60 is attached to the sleeve 20 and the fire-resistant hollow wall W so as to cover the outer blocking member 16, and then the sleeve 20 is positioned on the fire-resistant hollow wall W using positioning tape 61. Note that the waterproof tape 60 may be attached only to the sleeve 20 or only to the fire-resistant hollow wall W. The waterproof tape 60 is made of a non-breathable material. By attaching the waterproof tape 60 so as to cover the outer blocking member 16, it is possible to prevent outside air from reaching the outer blocking member 16.

Then, the fluid pipe 13 is inserted through the peripheral wall 21 of the sleeve 20. Filling material 15 is then inserted between the inner surface of the sleeve 20 and the insulating material 17 and refractory material 18 on the outer periphery of the fluid pipe 13, completing the through-hole structure.

According to the above embodiment, the following effects can be obtained.
(1-1) The peripheral wall 21 of the sleeve 20 can be formed by combining four bending members 30. Then, by adjusting the overlap length between the first plate portion 31 and the second plate portion 32 of the bending members 30 that are adjacent in the circumferential direction of the peripheral wall 21, the dimension of the side wall 22 in the circumferential direction of the peripheral wall 21 can be adjusted, and the size of the peripheral wall 21 can be flexibly matched to the size of the through hole 14. Therefore, it is no longer necessary to prepare multiple sleeves 20 to match the size of the through hole 14. Or, it is no longer necessary to form the through hole 14 to match the size of the sleeve 20.

(1-2) The first plate portion 31 and the second plate portion 32 of two adjacent bending members 30 are joined together with a joining member 50 while overlapping each other. This allows the overlap length of the first plate portion 31 and the second plate portion 32 to be maintained, and allows the length to be adjusted to match the size of the through hole 14.

(1-3) The outer blocking member 16 is compressible and deformable. Therefore, the outer blocking member 16 is compressed in the thickness direction by more than the plate thickness of the bending member 30 between the outer surface of the peripheral wall 21 of the sleeve 20 and the inner surface of the through hole 14, and is pressed against the outer surface of the peripheral wall 21 and the inner surface of the through hole 14. Therefore, the outer blocking member 16 can close the gap between the outer surface of the peripheral wall 21 and the inner surface of the through hole 14.

In particular, when the peripheral wall 21 is formed using the shrinking method, a step is formed at the overlapping portion of the first plate portion 31 and the second plate portion 32. However, the outer blocking member 16 deforms to conform to the step, allowing the outer blocking member 16 to close the gap between the outer surface of the peripheral wall 21 and the inner surface of the through hole 14. Furthermore, even if the corners of the through hole 14 are not right angles but are rounded, or if the inner surface of the through hole 14 is uneven, the outer blocking member 16 deforms to conform to the shape of the through hole 14, allowing the gap between the outer surface of the peripheral wall 21 and the inner surface of the through hole 14 to be closed.

(1-4) When the waterproof tape 60 is applied so as to cover the outer blocking member 16, the waterproof tape 60 is non-breathable, making it difficult for outside air to reach the outer blocking member 16. This prevents the outer blocking member 16 from becoming damp due to water vapor contained in the outside air. Furthermore, the waterproof tape 60 prevents the outer blocking member 16 from being exposed to the front side of the fire-resistant hollow wall W, thereby preventing deterioration of the outer blocking member 16.

Second Embodiment
Next, a second embodiment that embodies a sleeve, a through-hole structure, and a sleeve installation method will be described with reference to Figures 13 and 14. Since the second embodiment is configured by simply modifying the sleeve 20 of the first embodiment, detailed descriptions of similar parts will be omitted. The circumferential direction, penetration direction Z, first direction H1, second direction H2, and width direction H3 defined in the first embodiment are also the same in the second embodiment.

As shown in Figures 13 and 14, the sleeve 70 has a rectangular frame-shaped peripheral wall 71. The peripheral wall 71 is composed of four bending members 30 that form the peripheral wall structure, and four straight portion forming members 80 that also form the peripheral wall structure.

The straight portion forming body 80 is rectangular plate-shaped. The straight portion forming body 80 has a rectangular inner surface 81a on one side in the plate thickness direction and a rectangular outer surface 81b on the other side in the plate thickness direction. When the straight portion forming body 80 is viewed in the plate thickness direction, the direction in which the short sides of the inner surface 81a and outer surface 81b extend is defined as the fourth direction H4. When the straight portion forming body 80 is used to form a sleeve 70, the direction in which the long sides of the inner surface 81a and outer surface 81b of the straight portion forming body 80 extend is the same as the direction in which the long sides of the second inner surface 32a and second outer surface 32b of the second plate portion 32 extend. In the straight portion forming body 80, the direction in which the long sides of the inner surface 81a and outer surface 81b extend is defined as the width direction H3. The dimension of the straight portion forming body 80 in the width direction H3 is constant in the fourth direction H4. Therefore, the straight portion forming body 80 has a constant width that does not change along the fourth direction H4.

The peripheral wall 71 has four side walls 72 and four corners 73. The peripheral wall 71 is formed by combining four bending members 30 and four straight portion forming bodies 80. Specifically, the peripheral wall 71 is formed by combining and arranging the four bending members 30 and four straight portion forming bodies 80 to form a rectangular frame. The four corners 73 of the peripheral wall 71 are formed by the corner forming portions 33 of the four bending members 30.

Each of the four side walls 72 is formed by combining the tip of the first plate portion 31 of one of two bending members 30 positioned circumferentially apart around the peripheral wall 71, the tip of the second plate portion 32 of the other bending member 30, and a straight portion forming body 80 adjacent to the tip of the first plate portion 31 and the tip of the second plate portion 32 so as to overlap both tips in the plate thickness direction and connect them. In each side wall 72, the tip of the first plate portion 31 overlaps one end of the straight portion forming body 80 in the fourth direction H4, and the tip of the second plate portion 32 overlaps the other end of the straight portion forming body 80 in the fourth direction H4.

When the peripheral wall 71 is formed by combining the bending member 30 and the straight portion forming body 80, the greater the overlap amount between the first plate portion 31 and the second plate portion 32 relative to the straight portion forming body 80 along the circumferential direction of the peripheral wall 71, the smaller the dimension of the side wall 72 of the peripheral wall 71 in the circumferential direction. Conversely, the less the overlap amount between the first plate portion 31 and the second plate portion 32 relative to the straight portion forming body 80 along the circumferential direction of the peripheral wall 71, the larger the dimension of the side wall 72 of the peripheral wall 71 in the circumferential direction. Furthermore, by increasing or decreasing the overlap length between the first plate portion 31 and the second plate portion 32 in the peripheral wall 71 along the circumferential direction of the peripheral wall 71, the internal space K of the peripheral wall 71 can be expanded or contracted.

In each of the four side walls 72 of the peripheral wall 71, the tip of the first plate portion 31 and the straight portion forming body 80, and the tip of the second plate portion 32 and the straight portion forming body 80 are joined by joining members 50. It is preferable to uniformly position either the first plate portion 31, the second plate portion 32, or the straight portion forming body 80 on the outside in the overlapping direction in each of the four side walls 72. However, it is optional to determine whether the first plate portion 31, the second plate portion 32, or the straight portion forming body 80 is on the outside in the overlapping direction.

On each side wall 72, two joints are formed by the joining members 50. Therefore, eight joints are formed by the joining members 50 on the peripheral wall 71. By joining the four bending members 30 and the four straight portion forming bodies 80 with the joining members 50, the four bending members 30 and the four straight portion forming bodies 80 are assembled together and the shape of the peripheral wall 71 is maintained. The joining members 50 also serve as maintaining members that maintain the shape of the sleeve 70. The sleeve 70 is composed of the peripheral wall 71, which is formed from the four bending members 30 and the four straight portion forming bodies 80, and the joining members 50.

Therefore, according to the second embodiment, the following effect can be obtained in addition to the effect described in the first embodiment.
(2-1) Each of the four side walls 72 of the peripheral wall 71 is formed from a first plate portion 31, a second plate portion 32, and a straight portion forming body 80. Even if two circumferentially adjacent bending members 30 of the peripheral wall 21 are spaced apart in the circumferential direction, the straight portion forming body 80 prevents the side walls 72 from being interrupted between the first plate portion 31 and the second plate portion 32, and allows each side wall 72 to be extended in the circumferential direction. Therefore, the internal space K of the peripheral wall 71 can be expanded.

(Third embodiment)
Next, a third embodiment that embodies the sleeve, the through-hole structure, and the sleeve installation method will be described with reference to Figures 15 to 17. Since the third embodiment is configured by simply changing the sleeve 20 and the fireproof hollow wall W from the first embodiment, detailed descriptions of similar parts will be omitted. The circumferential direction, penetration direction Z, first direction H1, second direction H2, and width direction H3 defined in the first embodiment are also the same in the third embodiment.

As shown in FIG. 15(a), the sleeve 82 of the third embodiment surrounds a penetrating member (not shown) in a rectangular through-hole Fa that penetrates a floorboard F serving as a partition wall. Examples of penetrating members that penetrate the floorboard F include control cables, coaxial cables, and optical cables used as wiring, as well as flexible synthetic resin electrical conduits, steel electrical conduits, and fluid pipes used as piping materials. The sleeve 82 is used as a formwork for forming the through-hole Fa in the floorboard F. After the through-hole Fa is formed in the floorboard F by the sleeve 82, the sleeve 82 remains installed in the floorboard F.

As shown in Figure 17, the through hole Fa is square in plan view when the floorboard F is viewed from above. A square frame-shaped sleeve 82 is disposed within the through hole Fa. A penetrating member (not shown) is inserted into the sleeve 82, thereby passing through the through hole Fa in the floorboard F.

The sleeve 82 has a rectangular frame-shaped peripheral wall 83. The peripheral wall 83 has flanges 84 on both edges in the penetration direction Z. The peripheral wall 83 is composed of two long side walls 83a that face each other across the internal space K, and two short side walls 83b that face each other across the internal space K. Therefore, the peripheral wall 83 has four side walls: two long side walls 83a and two short side walls 83b. The flanges 84 are rectangular frame-shaped and protrude outward from the sleeve 82.

As shown in Figures 15(a), 15(b), and 16, the peripheral wall 83 is composed of two outer polymers 85 as bending members of the peripheral wall structure, two inner polymers 90 as bending members, and an outer straight portion forming body 100 and an inner straight portion forming body 105 as peripheral wall structures.

The outer polymer 85 has a rectangular first plate portion 86, a second plate portion 87 perpendicular to the first plate portion 86, a corner portion 88 located at the intersection of the first plate portion 86 and the second plate portion 87, and an outer flange portion 89 as a flange portion. The outer polymer 85 is made of a metal plate that is L-shaped when viewed along the penetration direction Z and has a constant width in the penetration direction Z. The outer polymer 85 also has the corner portion 88 and two plate portions that protrude perpendicularly from the corner portion 88 in the protruding direction and have a constant width in the protruding direction, one of which is the first plate portion 86 and the other is the second plate portion 87.

The first plate portion 86 has a rectangular first inner surface 86a on one side in the thickness direction, and a rectangular first outer surface 86b on the other side in the thickness direction. The second plate portion 87 has a rectangular second inner surface 87a on one side in the thickness direction, and a rectangular second outer surface 87b on the other side in the thickness direction.

The first inner surface 86a of the first plate portion 86 is perpendicular to the second inner surface 87a of the second plate portion 87. The first outer surface 86b of the first plate portion 86 is perpendicular to the second outer surface 87b of the second plate portion 87. The first plate portion 86 has a constant width that does not change along the first direction H1, which is the direction of protrusion from the corner forming portion 88. The second plate portion 87 has a constant width that does not change along the second direction H2, which is the direction of protrusion from the corner forming portion 88. The dimension of the first plate portion 86 along the first direction H1 is different from the dimension of the second plate portion 87 along the second direction H2. The dimension of the first plate portion 86 along the first direction H1 is larger than the dimension of the second plate portion 87 along the second direction H2.

The outer flange forming portions 89 are located at both end edges of the outer polymer 85 in the penetration direction Z. The outer flange forming portions 89 are provided over the entire direction in which the first plate portion 86 protrudes from the corner forming portion 88, and over the entire direction in which the second plate portion 87 protrudes from the corner forming portion 88. In other words, the outer flange forming portions 89 are provided over the entire L-shape of the outer polymer 85. The outer flange forming portions 89 are composed of a base end flange portion 89a near the first plate portion 86 and the second plate portion 87, and a tip end flange portion 89b protruding from the base end flange portion 89a.

The base end flange portion 89a and the tip flange portion 89b are offset in the penetration direction Z. The base end flange portion 89a is located closer to the first plate portion 86 and the second plate portion 87 than the tip flange portion 89b. Therefore, the outer flange forming portion 89 is formed in a stepped shape by the base end flange portion 89a and the tip flange portion 89b. In the outer flange forming portion 89, the base end flange portion 89a can be said to be positioned recessed from the tip flange portion 89b in the penetration direction Z.

Each of the two outer flange forming portions 89 has a surface 89c of the base flange portion 89a located at both ends of the outer polymer 85 in the penetration direction Z, and a back surface 89d on the opposite side of the surface 89c in the thickness direction of the outer flange forming portion 89.

The outer polymer 85 has an outer overlapping step 85a in the center in the penetration direction Z. The outer overlapping step 85a is provided over the entire direction in which the first plate portion 86 protrudes from the corner forming portion 88, and over the entire direction in which the second plate portion 87 protrudes from the corner forming portion 88. In other words, the outer overlapping step 85a is provided over the entire L-shape of the outer polymer 85.

The outer overlapping step 85a is formed by bulging the metal plate toward the first outer surface 86b of the first plate portion 86 and toward the second outer surface 87b of the second plate portion 87. The outer overlapping step 85a is recessed from the first inner surface 86a and the second inner surface 87a. The opening width of the outer overlapping step 85a along the penetration direction Z is constant throughout the entire L-shape of the outer polymer 85.

The outer overlapping step 85a has multiple holes 85b that penetrate the outer overlapping step 85a in the plate thickness direction. The multiple holes 85b are provided at equal intervals throughout the entire L-shape of the outer overlapping step 85a.

The inner polymer 90 has a rectangular first plate portion 91, a second plate portion 92 perpendicular to the first plate portion 91, a corner portion 93 located at the intersection of the first plate portion 91 and the second plate portion 92, and an inner flange portion 94 as a flange portion. The inner polymer 90 is made of a metal plate that is L-shaped when viewed along the penetration direction Z and has a constant width in the penetration direction Z. The inner polymer 90 also has the corner portion 93 and two plate portions that protrude perpendicularly from the corner portion 93 in the protrusion direction and have a constant width in the protrusion direction, one of which is the first plate portion 91 and the other is the second plate portion 92.

The first plate portion 91 has a rectangular first inner surface 91a on one side in the thickness direction, and a rectangular first outer surface 91b on the other side in the thickness direction. The second plate portion 92 has a rectangular second inner surface 92a on one side in the thickness direction, and a rectangular second outer surface 92b on the other side in the thickness direction.

The first inner surface 91a of the first plate portion 91 is perpendicular to the second inner surface 92a of the second plate portion 92. The first outer surface 91b of the first plate portion 91 is perpendicular to the second outer surface 92b of the second plate portion 92. The first plate portion 91 has a constant width that does not change along the first direction H1, which is the direction of protrusion from the corner forming portion 93. The second plate portion 92 has a constant width that does not change along the second direction H2, which is the direction of protrusion from the corner forming portion 93. The dimension of the first plate portion 91 along the first direction H1 is different from the dimension of the second plate portion 92 along the second direction H2. The dimension of the first plate portion 91 along the first direction H1 is larger than the dimension of the second plate portion 92 along the second direction H2.

The inner flange forming portions 94 are located at both end edges of the inner polymer 90 in the penetration direction Z. The inner flange forming portions 94 are provided over the entire direction in which the first plate portion 91 protrudes from the corner forming portion 93, and over the entire direction in which the second plate portion 92 protrudes from the corner forming portion 93. In other words, the inner flange forming portions 94 are provided over the entire L-shape of the inner polymer 90.

The inner flange forming portion 94 has a surface 94a located at both ends in the penetration direction Z, and a back surface 94b located on the opposite side of the surface 94a in the plate thickness direction of the inner flange forming portion 94.
In the inner polymer 90, the dimension in the penetration direction Z between the two back surfaces 94b is slightly larger than the dimension in the penetration direction Z between the two front surfaces 89c in the outer polymer 85. Therefore, the inner polymer 90 and the outer polymer 85 can be combined with each other with the back surface 94b of the inner flange forming portion 94 of the inner polymer 90 facing the front surface 89c of the base end flange portion 89a of the outer polymer 85.

The inner polymer 90 has an inner overlapping step 90a in the center in the penetration direction Z. The inner overlapping step 90a is provided over the entire direction in which the first plate 91 protrudes from the corner forming portion 93, and over the entire direction in which the second plate 92 protrudes from the corner forming portion 93. In other words, the inner overlapping step 90a is provided over the entire L-shape of the inner polymer 90.

The inner overlapping step 90a is formed by bulging the metal plate toward the first outer surface 91b of the first plate portion 91 and toward the second outer surface 92b of the second plate portion 92. The thickness of the inner overlapping step 90a along the penetration direction Z is constant throughout the L-shape of the inner polymer 90. The thickness of the inner overlapping step 90a along the penetration direction Z is smaller than the opening width of the outer overlapping step 85a along the penetration direction Z. The inner overlapping step 90a has multiple holes 90b that penetrate the inner overlapping step 90a in the plate thickness direction. The multiple holes 90b are arranged at equal intervals throughout the L-shape of the inner overlapping step 90a.

The outer straight portion forming body 100 has a rectangular plate-shaped outer main body portion 101, outer flange forming portions 102 located at both end edges of the outer main body portion 101 in the penetration direction Z, and an outer bulge portion 103 located in the center of the outer main body portion 101 in the penetration direction Z.

The outer main body portion 101 has a rectangular inner surface 101a on one side in the thickness direction, and a rectangular outer surface 101b on the other side in the thickness direction. The outer flange forming portions 102 are located on both end edges of the outer main body portion 101 in the penetration direction Z. The outer flange forming portions 102 are provided over the entire both end edges of the outer main body portion 101. The outer flange forming portions 102 are composed of a base end flange portion 102a closer to the outer main body portion 101, and a tip end flange portion 102b extending from the base end flange portion 102a.

The base end flange portion 102a and the tip flange portion 102b are offset in the penetration direction Z. The base end flange portion 102a is located closer to the outer main body portion 101 than the tip flange portion 102b. Therefore, the outer flange forming portion 102 is formed in a stepped shape by the base end flange portion 102a and the tip flange portion 102b. In the outer flange forming portion 102, the base end flange portion 102a can be said to be positioned recessed from the tip flange portion 102b in the penetration direction Z.

Each of the two outer flange forming portions 102 has a surface 102c of the base end flange portion 102a located at both ends of the outer straight portion forming body 100 in the penetration direction Z, and a back surface 102d on the opposite side of the surface 102c in the plate thickness direction of the outer flange forming portion 102.

Here, the dimension in the penetration direction Z between the two back surfaces 94b of the inner polymer 90 is slightly larger than the dimension in the penetration direction Z between the two front surfaces 102c of the outer straight portion forming body 100. Therefore, the inner polymer 90 and the outer straight portion forming body 100 can be combined with each other by facing the back surface 94b of the inner flange forming portion 94 of the inner polymer 90 to the front surface 102c of the base end flange portion 102a of the outer straight portion forming body 100.

The outer bulge 103 is formed by a metal plate that bulges toward the outer surface 101b of the outer main body 101. The opening width of the outer bulge 103 along the penetration direction Z is constant throughout the entire width of the outer main body 101.

The inner straight portion forming body 105 has a rectangular plate-shaped inner main body portion 106, inner flange forming portions 107 located at both end edges of the inner main body portion 106 in the penetration direction Z, and an inner bulge portion 108 located in the center of the inner main body portion 106 in the penetration direction Z.

The inner main body portion 106 has a rectangular inner surface 106a on one side in the thickness direction, and a rectangular outer surface 106b on the other side in the thickness direction. The inner flange forming portions 107 are located at both end edges of the inner main body portion 106 in the penetration direction Z. The inner flange forming portions 107 are provided over the entire both end edges of the inner main body portion 106. Each of the two inner flange forming portions 107 has a surface 107c located at both ends of the inner straight portion forming body 105 in the penetration direction Z, and a back surface 107d on the opposite side of the surface 107c in the thickness direction of the inner flange forming portion 107.

Here, the dimension in the penetration direction Z between the two back surfaces 107d of the inner straight portion forming body 105 is slightly larger than the dimension in the penetration direction Z between the two front surfaces 89c of the outer polymer 85. Therefore, the inner straight portion forming body 105 and the outer polymer 85 can be combined with each other by facing the back surface 107d of the inner flange forming portion 107 of the inner straight portion forming body 105 to the front surface 89c of the base end flange portion 89a of the outer polymer 85.

The inner bulge 108 is formed by a metal plate that bulges toward the outer surface 106b of the inner main body 106. The opening width of the inner bulge 108 is constant throughout the entire width of the inner main body 106.

Next, a method for installing the sleeve 82 and a method for constructing the through-hole structure will be described.
As shown in Figure 17, the sleeve 82 of this embodiment is installed in the through hole Fa by previously integrating two outer polymers 85, two inner polymers 90, one outer straight portion forming body 100, and one inner straight portion forming body 105.

The two outer polymers 85 are arranged so that the two first plate portions 86 are aligned circumferentially around the peripheral wall 83. In this case, the first plate portions 86 of the two outer polymers 85 may be spaced apart circumferentially around the peripheral wall 83, or their tips may be in contact with each other.

The inner straight portion forming body 105 is placed on the first inner surface 86a side of the first plate portion 86 of the two outer polymers 85, and the back surface 107d of the inner flange forming portion 107 of the inner straight portion forming body 105 faces the surface 89c of the outer flange forming portion 89 of each outer polymer 85. At this time, the tip ends of the two outer polymers 85 and the tip end of the inner straight portion forming body 105 are overlapped in the plate thickness direction. The outer overlapping step portion 85a and the inner bulge portion 108 of the overlapped outer polymer 85 and inner straight portion forming body 105 fit together and overlap.

Then, the outer surface 106b of the inner main body portion 106 of the inner straight portion forming body 105 faces the first inner surfaces 86a of the two outer polymers 85. As a result, one long side wall 83a of the peripheral wall 83 is formed by the first plate portions 86 of the two outer polymers 85 and the inner straight portion forming body 105.

The two inner polymers 90 are arranged so that the two first plate portions 91 are aligned in the circumferential direction of the peripheral wall 83. In this case, the first plate portions 91 of the two inner polymers 90 may be spaced apart in the circumferential direction of the peripheral wall 83, or their tips may be in contact with each other.

An outer straight portion forming body 100 is placed on the first outer surface 91b of the two inner polymers 90, with the outer flange forming portion 102 of the outer straight portion forming body 100 facing the inner flange forming portion 94 of the two inner polymers 90. The front surface 102c of the outer flange forming portion 102 of the outer straight portion forming body 100 faces the back surface 94b of the inner flange forming portion 94 of each inner polymer 90. At this time, the tip ends of the two inner polymers 90 and the tip end of the outer straight portion forming body 100 are overlapped in the thickness direction. The overlapped inner polymers 90 and outer straight portion forming body 100 are overlapped with each other, with the inner overlap step portion 90a and outer bulge portion 103 fitting together.

Then, the inner surface 101a of the outer main body portion 101 of the outer straight portion forming body 100 faces the first outer surface 91b of the two inner polymers 90. As a result, one long side wall 83a of the peripheral wall 83 is formed by the first plate portions 91 of the two inner polymers 90 and the outer straight portion forming body 100.

The second plate portion 92 of the inner polymer 90 is positioned on the inside of each of the second plate portions 87 of the two outer polymers 85. The back surface 94b of the inner flange forming portion 94 of the inner polymer 90 faces the surface 89c of the outer flange forming portion 89 of each outer polymer 85. At this time, the tip end of the second plate portion 87 of the outer polymer 85 and the tip end of the second plate portion 92 of the inner polymer 90 are overlapped in the plate thickness direction. The overlapped outer polymer 85 and inner polymer 90 are overlapped with each other, with the outer overlapping step portion 85a and the inner overlapping step portion 90a fitting together.

Then, the second outer surface 92b of the second plate portion 92 of the inner polymer 90 faces the second inner surface 87a of the second plate portion 87 of the outer polymer 85. As a result, the second plate portion 87 of the outer polymer 85 and the second plate portion 92 of the inner polymer 90 form two short side walls 83b of the peripheral wall 83.

The peripheral wall 83 has rectangular frame-shaped flanges 84 that protrude outward from both end edges in the penetration direction Z. The flanges 84 are formed into a rectangular frame shape by combining outer flange forming portions 89 of the two outer polymers 85, inner flange forming portions 94 of the two inner polymers 90, outer flange forming portions 102 of the outer straight portion forming body 100, and inner flange forming portions 107 of the inner straight portion forming body 105.

Two of the four corners of the peripheral wall 83 are formed by corner forming portions 88 of the outer polymer 85 , and the remaining two are formed by corner forming portions 93 of the inner polymer 90 .
The outer flange forming portions 89 of the outer polymers 85 adjacent in the circumferential direction of the peripheral wall 83 and the inner flange forming portions 107 of the inner straight portion forming bodies 105 are overlapped in the plate thickness direction. In addition, the inner flange forming portions 94 of the inner polymers 90 adjacent in the circumferential direction of the peripheral wall 83 and the outer flange forming portions 102 of the outer straight portion forming bodies 100 are overlapped in the plate thickness direction. Furthermore, the outer flange forming portions 89 of the outer polymers 85 adjacent in the circumferential direction of the peripheral wall 83 and the inner flange forming portions 94 of the inner polymers 90 are overlapped in the plate thickness direction.

The peripheral wall 83 includes a pair of opposing long side walls 83a and a pair of opposing short side walls 83b. In one of the pair of long side walls 83a, two bending members positioned circumferentially apart are outer polymers 85. The two outer polymers 85 are overlapped on the outside of the rectangular frame with respect to an inner straight portion forming body 105, which serves as a first straight portion forming body connecting the outer polymers 85. Furthermore, the outer flange forming portions 89 of the two outer polymers 85 are overlapped on the other edge side in the penetration direction Z relative to the inner flange forming portion 107 of the inner straight portion forming body 105.

On the other long side wall 83a of one set of two long side walls 83a, the two bending members positioned circumferentially apart are inner polymers 90. The two inner polymers 90 overlap with the outer straight portion forming body 100, which serves as a second straight portion forming body connecting the inner polymers 90, on the inside of the rectangular frame. In addition, the inner flange forming portions 94 of the two inner polymers 90 overlap with the outer flange forming portion 102 of the outer straight portion forming body 100 on one edge side in the penetration direction Z.

Each of the two short side walls 83b is composed of one set of two bending members, an outer polymer 85 and an inner polymer 90, which face each other across the internal space K. In each of the other set of two short side walls 83b, the tip of the second plate portion 87 of the outer polymer 85 overlaps with the tip of the second plate portion 92 of the inner polymer 90 so that it is located further outward than the tip of the second plate portion 92.

Furthermore, in each long side wall 83a, the greater the amount of polymerization of each inner polymer 90 relative to the outer straight portion forming body 100 and the amount of polymerization of each outer polymer 85 relative to the inner straight portion forming body 105 along the circumferential direction of the peripheral wall 83, the smaller the dimension of the long side wall 83a in the circumferential direction of the peripheral wall 83. Conversely, the less the amount of polymerization of each inner polymer 90 relative to the outer straight portion forming body 100 and the amount of polymerization of each outer polymer 85 relative to the inner straight portion forming body 105 along the circumferential direction of the peripheral wall 83, the larger the dimension of the long side wall 83a in the circumferential direction of the peripheral wall 83.

When adjusting the overlap length of the long side wall 83a, the overlap length in the circumferential direction of the peripheral wall 83 is guided by the fit between the overlapped outer overlap step 85a and the inner bulge 108, and the fit between the inner overlap step 90a and the outer bulge 103.

Furthermore, in the pair of short side walls 83b, the greater the amount of overlap between the second plate portion 87 of the outer polymer 85 and the second plate portion 92 of the inner polymer 90 along the circumferential direction of the peripheral wall 83, the smaller the dimension of the short side wall 83b in the circumferential direction of the peripheral wall 83. Conversely, the less the amount of overlap between the second plate portion 87 of the outer polymer 85 and the second plate portion 92 of the inner polymer 90 along the circumferential direction of the peripheral wall 83, the larger the dimension of the short side wall 83b in the circumferential direction of the peripheral wall 83.

When adjusting the overlap length of the short side wall 83b, the overlapping outer overlapping step 85a and inner overlapping step 90a fit together, guiding the adjustment of the overlap length in the circumferential direction of the peripheral wall 83. By increasing or decreasing the amount of overlap in the long side wall 83a and short side wall 83b of the peripheral wall 83 along the circumferential direction of the peripheral wall 83, the internal space K of the peripheral wall 83 can be expanded or contracted.

Although not shown, in the long side wall 83a of the peripheral wall 83, the outer polymer 85 and the inner straight portion forming body 105, and the inner polymer 90 and the outer straight portion forming body 100 are joined by joining members similar to the joining member 50 shown in the first embodiment, and in the short side wall 83b, the outer polymer 85 and the inner polymer 90 are joined by joining members.

Two joints are formed by the joining members on each long side wall 83a. One joint is formed by the joining members on each short side wall 83b. Therefore, six joints are formed by the joining members on the peripheral wall 83. The two outer polymers 85, the two inner polymers 90, the outer straight portion forming body 100, and the inner straight portion forming body 105 are joined by the joining members, which assembles them together and maintains the shape of the peripheral wall 83. The joining members also serve as maintaining members that maintain the shape of the sleeve 82.

The sleeve 82 is composed of two outer polymers 85, two inner polymers 90, an outer straight portion forming body 100, an inner straight portion forming body 105, and a connecting member. When the sleeve 82 is used as a formwork for forming the through hole Fa, the flange 84 is engaged around the through hole Fa in the floor plate F.

In addition, instead of aluminum tape, the joining member may be a bolt or a tapping screw. In this case, the bolt or tapping screw may be inserted into a hole 85b formed in the outer overlapping step portion 85a of the outer polymer 85, and the bolt or tapping screw may be screwed into the inner bulge portion 108 of the overlapping inner straight portion forming body 105 to join the outer polymer 85 and the inner straight portion forming body 105. Therefore, the hole 85b is a hole that allows the bolt or tapping screw to be threaded back and forth.

Similarly, a bolt or tapping screw may be inserted into a hole 90b formed in the inner overlapping step 90a of the inner polymer 90, and the bolt or tapping screw may be threaded into the outer bulge 103 of the overlapping outer straight portion forming body 100 to join the inner polymer 90 and the outer straight portion forming body 100. Therefore, the hole 90b is a hole that allows the bolt or tapping screw to be threaded back and forth. Alternatively, a bolt or tapping screw may be inserted into the hole 85b of the outer polymer 85 or the hole 90b of the inner polymer 90, and the bolt or tapping screw may be threaded into the overlapping inner overlapping step 90a or the outer overlapping step 85a to join the outer polymer 85 and the inner polymer 90.

Therefore, according to the third embodiment, in addition to the effects (1-1) to (1-4) described in the first embodiment and the effect (2-1) described in the second embodiment, the following effect can be obtained.
(3-1) The peripheral wall 83 has flanges 84 at both end edges in the penetration direction Z. In the flange 84, an outer flange forming portion 89 of the outer polymer 85 and an inner flange forming portion 107 of the inner straight portion forming body 105 overlap in the plate thickness direction. At this time, the inner flange forming portion 107 overlaps with a base end flange portion 89a that is recessed in the penetration direction Z more than a tip flange portion 89b of the outer flange forming portion 89. Therefore, the outer flange forming portion 89 and the inner flange forming portion 107 can be made flush with each other.

Furthermore, in the flange 84, the outer flange forming portion 102 of the outer straight portion forming body 100 and the inner flange forming portion 94 of the inner polymer 90 overlap in the plate thickness direction. At this time, the inner flange forming portion 94 overlaps the base end flange portion 102a, which is recessed in the penetration direction Z more than the tip flange portion 102b of the outer flange forming portion 102. This allows the outer flange forming portion 102 and the inner flange forming portion 94 to be flush with each other.

In addition, in the flange 84, the outer flange forming portion 89 of the outer polymer 85 and the inner flange forming portion 94 of the inner polymer 90 overlap in the plate thickness direction. At this time, the inner flange forming portion 94 overlaps the base end flange portion 89a, which is recessed in the penetration direction Z more than the tip flange portion 89b of the outer flange forming portion 89. This allows the outer flange forming portion 89 and the inner flange forming portion 94 to be flush with each other.

Furthermore, by overlapping the outer flange forming portion 89 with the inner flange forming portion 107, the outer flange forming portion 102 with the inner flange forming portion 94, and the outer flange forming portion 89 with the inner flange forming portion 94, gaps between adjacent peripheral wall components can be eliminated. Therefore, when forming the floor plate F, the flange 84 is engaged around the through hole Fa in the floor plate F, but due to the overlapping of the flange forming portions, no gaps are formed between the through hole Fa and the peripheral wall 83, preventing concrete from entering the sleeve 82.

(3-2) When adjusting the overlap length of the long side wall 83a, the overlapped outer overlap step 85a fits into the inner bulge 108, guiding the adjustment of the overlap length in the circumferential direction of the peripheral wall 83. Therefore, when adjusting the overlap length, it is possible to prevent the outer overlap portion 85 and the inner straight portion forming body 105 from shifting in the penetration direction Z.

Similarly, when adjusting the overlap length of the long side wall 83a, the fit between the overlapped inner overlap step portion 90a and the outer bulge portion 103 guides the adjustment of the overlap length in the circumferential direction of the peripheral wall 83. Therefore, when adjusting the overlap length, it is possible to prevent the inner polymer 90 and the outer straight portion forming body 100 from shifting in the penetration direction Z.

When adjusting the overlap length of the short side wall 83b, the fit between the overlapped outer overlap step 85a and inner overlap step 90a guides the adjustment of the overlap length in the circumferential direction of the peripheral wall 83. Therefore, when adjusting the overlap length, it is possible to prevent the outer polymer 85 and inner polymer 90 from shifting in the penetration direction Z.

As a result, the overlap length of the peripheral wall 83 in the circumferential direction can be easily adjusted overall.
This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

- In the third embodiment, the peripheral wall 83 of the sleeve 82 may be composed of two outer polymers 85 and two inner polymers 90. In other words, the peripheral wall 83 of the sleeve 82 may be composed of only two outer polymers 85 and two inner polymers 90 as four bending members. The peripheral wall 83 also has flanges 84 at both end edges in the penetration direction Z. This form of sleeve 82 is formed by removing the outer straight portion forming body 100 and inner straight portion forming body 105 from the peripheral wall 83 of the third embodiment and instead constituting the peripheral wall 83 with two outer polymers 85 and two inner polymers 90.

As shown in FIG. 18, each of the two long side walls 83 a in one set and each of the two short side walls 83 b in the other set are made up of an outer polymer 85 and an inner polymer 90 .
At this time, in a pair of long side walls 83a, the outer polymer 85 and the inner polymer 90 face each other between the two long side walls 83a with the internal space K interposed therebetween, and in a pair of short side walls 83b, the outer polymer 85 and the inner polymer 90 face each other between the two short side walls 83b with the internal space K interposed therebetween. In other words, the two outer polymers 85 are located on a diagonal line of the peripheral wall 83, and the two inner polymers 90 are located on a diagonal line of the peripheral wall 83.

Therefore, for one outer polymer 85, the first plate portion 91 of one inner polymer 90 is arranged inside the first plate portion 86, and the second plate portion 92 of the other inner polymer 90 is arranged inside the second plate portion 87. Thus, the two outer polymers 85 are arranged in a position where one outer polymer 85 is inverted upside down relative to the other outer polymer 85, and the two inner polymers 90 are arranged in a position where one inner polymer 90 is inverted upside down relative to the other inner polymer 90.

In the flange 84, the order of stacking in the thickness direction of circumferentially adjacent flange forming portions alternates in the circumferential direction. In other words, in the flange 84, the order of stacking in the thickness direction of the outer flange forming portion 89 of the outer polymer 85 and the inner flange forming portion 94 of the inner polymer 90 alternates in the circumferential direction.

Two of the four corners of the peripheral wall 83 are formed by corner forming portions 88 of the outer polymer 85 , and the remaining two are formed by corner forming portions 93 of the inner polymer 90 .
By configuring in this manner, the sleeve 82 can have a smaller internal space K than the sleeve 82 of the third embodiment.

In addition, by adding an outer straight portion forming body 100 and an inner straight portion forming body 105 to the peripheral wall 83 of the sleeve 82 shown in Figure 18, it is possible to return to the sleeve 82 of the third embodiment and create a sleeve 82 with an expanded internal space K.

The method of installing the sleeve 20 in the first embodiment may be modified as follows.
The outer blocking member 16 is positioned along the first inner surface 141 and the second inner surface 142. Next, as shown in Figure 19, the tip of the second plate portion 32 of the first bending member 30a and the tip of the first plate portion 31 of the fourth bending member 30d are overlapped in the plate thickness direction, and the adjacent first plate portion 31 and second plate portion 32 are joined with a joining member 50. When the first bending member 30a and the fourth bending member 30d are joined, a first assembly 51 is formed. This first assembly 51 includes one side wall 22, the first plate portion 31 protruding from one end of the side wall 22, and the second plate portion 32 protruding from the other end of the side wall 22.

The length of the side wall 22 formed in the first assembly 51 is adjusted by adjusting the overlap length of the first plate portion 31 and the second plate portion 32 so that it fits one of the four inner surfaces of the through-hole 14 .
Then, the first assembly 51 is inserted into the through-hole 14. At this time, the side wall 22 of the first assembly 51 is aligned with the surface of the inner surface of the outer blocking member 16 arranged in the through-hole 14 that is aligned with the first inner surface 141. In addition, the first plate portion 31 is aligned with the second inner surface 142, and the second plate portion 32 of the fourth inner surface 144 is aligned with the second inner surface 142.

Next, the tip of the first plate portion 31 of the second bending member 30b and the tip of the second plate portion 32 of the third bending member 30c are overlapped in the plate thickness direction, and the adjacent first plate portion 31 and second plate portion 32 are joined with a joining member 50. When the second bending member 30b and the third bending member 30c are joined, a second assembly 52 is formed. This second assembly 52 includes one side wall 22, a first plate portion 31 protruding from one end of the side wall 22, and a second plate portion 32 protruding from the other end of the side wall 22.

The length of the side wall 22 formed in the second assembly 52 is adjusted by adjusting the overlap length of the first plate portion 31 and the second plate portion 32 so that it fits one of the four inner surfaces of the through-hole 14 .
Then, the second assembly 52 is inserted into the through hole 14. At this time, the side wall 22 of the second assembly 52 is aligned along the surface of the inner surface of the outer blocking member 16 arranged in the through hole 14 that is aligned with the third inner surface 143, the second plate portion 32 is aligned along the second inner surface 142, and the first plate portion 31 is aligned along the fourth inner surface 144.

The first plate portion 31 of the first assembly 51 and the second plate portion 32 of the second assembly 52 are overlapped in the plate thickness direction to form the side wall 22. At the same time, the second plate portion 32 of the first assembly 51 and the first plate portion 31 of the second assembly 52 are overlapped in the plate thickness direction to form the side wall 22. At this time, the overlap length of the first plate portion 31 and the second plate portion 32 is adjusted so that the length of the side wall 22 matches one of the four inner surfaces of the through hole 14. Then, in the first assembly 51 and the second assembly 52, the overlapped first plate portion 31 and second plate portion 32 are joined by the joining member 50.

The combination of the two bending members 30 forming the first assembly 51 and the combination of the two bending members 30 forming the second assembly 52 may be changed as appropriate.
The method of installing the sleeve 20 in the first embodiment may be modified as follows.

The overlapping length of the first plate portion 31 and second plate portion 32 of adjacent four bending members 30 is adjusted to form the peripheral wall 21, and the sleeve 20 is then pre-formed by joining them with a joining member 50. At this time, the overlapping length of the four side walls 22 is adjusted so that they fit along the inner surface of the through hole 14 and allow the outer blocking member 16 to be in a compressed state. The sized sleeve 20 is then placed inside the through hole 14.

The peripheral wall constituents may be rectangular plate-shaped materials. In this case, one corner 23 of the peripheral wall 21 is formed by combining two peripheral wall constituents in an L shape. Also, one side wall 22 of the peripheral wall 21 is formed by combining at least two peripheral wall constituents. When the peripheral wall 21 is formed using multiple peripheral wall constituents, adjacent peripheral wall constituents may be joined by a joining member 50 or by welding. Alternatively, the peripheral wall constituents may be adhered to the inner surface of the through hole 14.

The bending member 30 does not have to be formed by bending a metal plate, but may be formed by two metal plates of a fixed width into an L shape with adhesive tape. When configured in this way, the bending member 30 may be formed into an L shape at the installation site of the sleeve 20, or it may be formed into an L shape in a factory.

The outer polymer 85 and inner polymer 90 do not necessarily have to be formed by bending metal plates, but may be formed by two metal plates of a fixed width being formed into an L shape with adhesive tape. When configured in this way, the outer polymer 85 and inner polymer 90 may be formed into an L shape at the installation site of the sleeve 82, or they may be formed into an L shape in a factory.

The joining member 50 is attached to the first plate portion 31 and the second plate portion 32 so as to span the first plate portion 31 and the second plate portion 32. However, if the joining member 50 is double-sided tape, the joining member 50 may be interposed between the overlapping first plate portion 31 and the second plate portion 32 to join the first plate portion 31 and the second plate portion 32.

The joining member 50 is attached to the overlapping peripheral wall structure so as to span the outer polymer 85 and inner straight portion forming body 105, the inner polymer 90 and outer straight portion forming body 100, and the outer polymer 85 and inner polymer 90. However, if the joining member 50 is double-sided tape, the joining member 50 may be interposed between the overlapping outer polymer 85 and inner straight portion forming body 105, the inner polymer 90 and outer straight portion forming body 100, and the outer polymer 85 and inner polymer 90 to join them.

- In the bending member 30, the dimension of the first plate portion 31 in the first direction H1 and the dimension of the second plate portion 32 in the second direction H2 may be the same or may be changed as appropriate. Furthermore, in the outer polymer 85, the dimension of the first plate portion 86 in the first direction H1 and the dimension of the second plate portion 87 in the second direction H2 may be the same or may be changed as appropriate. In the inner polymer 90, the dimension of the first plate portion 91 in the first direction H1 and the dimension of the second plate portion 92 in the second direction H2 may be the same or may be changed as appropriate.

- Adhesive tape may be applied around the entire circumferential surface of the peripheral wall 21, 71, 83 to maintain the rectangular cylindrical shape of the sleeve 20, 70, 82. In this case, the adhesive tape constitutes the maintaining member.

- In the first embodiment, the first plate portion 31 and the second plate portion 32 are overlapped by the two bending members 30 that make up one side wall 22. However, the first plate portions 31 may also be overlapped by the two bending members 30 that make up one side wall 22. In this case, as shown in FIG. 20, the side wall 22 opposite the side wall 22 formed by overlapping the first plate portions 31 also has the first plate portions 31 overlapped by the adjacent bending members 30. Therefore, the remaining two side walls 22 have the second plate portions 32 overlapped by the adjacent bending members 30.

When configured in this manner, the peripheral wall 21 formed has an elongated rectangular frame shape. Therefore, by selecting the plate portions to be overlapped, the peripheral wall 21 can be easily matched to the shape of the through hole 14. In other words, the bending member 30 has a first plate portion 31 and a second plate portion 32 of different lengths. Therefore, by selecting the first plate portion 31 and the second plate portion 32 to be overlapped, it is possible to flexibly adapt to the shape and size of the through hole 14.

- In the second embodiment, one set of side walls 72 of the peripheral wall 71 is formed using the first plate portion 31 and the second plate portion 32 of two bending members 30 positioned circumferentially apart on the peripheral wall 71 and the straight portion forming body 80, and the remaining set of side walls 72 may be formed using the first plate portion 31 and the second plate portion 32 of two bending members 30 adjacent to each other in the circumferential direction of the peripheral wall 71 without using the straight portion forming body 80.

The partition wall does not have to be a hollow wall, but may be a solid wall.
In the through-hole structure of the fire-resistant hollow wall W, the outer blocking member 16 may be omitted.
The technical ideas that can be understood from the above-described embodiment and modified examples will be described.

<Appendix 1>
A sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction,
A peripheral wall is provided which is formed into a rectangular frame shape by combining four peripheral wall constituent bodies,
If the direction in which the internal space surrounded by the peripheral wall opens is defined as the penetration direction of the peripheral wall,
Each of the four peripheral wall constituents is L-shaped when viewed along the penetration direction, is made of a metal plate having a constant width in the penetration direction, and has an angle forming portion and two plate portions that protrude perpendicularly from the angle forming portion and have a constant width in the protruding direction,
The peripheral wall has four side walls;
Each side wall is formed by overlapping a tip end of the plate portion of one of the peripheral wall constituents adjacent to each other in the circumferential direction of the peripheral wall with a tip end of the plate portion of the other peripheral wall constituent in the plate thickness direction, and the internal space is expanded or contracted by changing the overlap length in the protruding direction.

<Appendix 2>
A sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction,
A peripheral wall is formed into a rectangular frame shape by combining a plurality of peripheral wall constituent members made of metal plates,
The peripheral wall structure has four bending members and two or four straight portion forming members,
If the direction in which the internal space surrounded by the peripheral wall opens is defined as the penetration direction of the peripheral wall,
Each of the four bending members is L-shaped when viewed along the penetration direction, is made of a metal plate having a constant width in the penetration direction, and has a corner forming portion and two plate portions that protrude perpendicularly from the corner forming portion and have a constant width in the protruding direction,
The straight portion forming body has a shape extending with the constant width,
The peripheral wall has four side walls;
At least two of the four side walls are composed of a tip end portion of the plate portion of one of the two bending members positioned apart in the circumferential direction of the peripheral wall, a tip end portion of the other plate portion, and the straight portion forming body overlapped with both tip ends in the plate thickness direction so as to connect the two tip ends,
A sleeve characterized in that the internal space is expanded or contracted by changing the overlap length in the protruding direction.

<Appendix 3>
A sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction,
A rectangular frame-shaped peripheral wall is provided which is formed by combining a plurality of peripheral wall constituent bodies,
The direction in which the internal space surrounded by the peripheral wall opens is defined as a penetration direction,
Each of the peripheral wall constituents is made of a metal plate having a plate portion with a constant width in the penetration direction,
The peripheral wall has four side walls;
each side wall is formed by overlapping a tip end portion of one of at least two peripheral wall constituents adjacent to each other in the circumferential direction of the peripheral wall with a tip end portion of the other peripheral wall constituent in the plate thickness direction, and the internal space is expanded or contracted by changing the overlap length of the peripheral wall in the circumferential direction.

<Appendix 4>
a penetrating member is disposed in a through hole that penetrates the partition wall in a wall thickness direction and has a rectangular shape when viewed in the wall thickness direction;
the penetrating member is surrounded by a sleeve within the through hole;
the sleeve has a rectangular frame-shaped peripheral wall formed by combining a plurality of peripheral wall constituent bodies,
The direction in which the internal space surrounded by the peripheral wall opens is defined as a penetration direction,
The peripheral wall has four side walls;
Each of the plurality of peripheral wall constituents is made of a metal plate having a constant width in the penetration direction,
In the side wall, two of the peripheral wall constituents are arranged adjacent to each other in the circumferential direction of the peripheral wall, and tip portions of the two adjacent peripheral wall constituents overlap with each other in the plate thickness direction of the peripheral wall constituents,
A through-hole structure characterized in that an outer blocking member compressively deformed in the thickness direction of the peripheral wall constituent body is disposed between the overlapped peripheral wall constituent body and the inner surface of the through-hole.

<Appendix 5>
A method for installing a sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction, the method comprising:
The sleeve has a peripheral wall formed by combining four peripheral wall constituent bodies into a rectangular frame shape,
If the direction in which the internal space surrounded by the peripheral wall opens is defined as a penetration direction, and the direction in which the internal space is surrounded is defined as a circumferential direction,
Four peripheral wall structures are arranged in the through hole, each of which is L-shaped when viewed along the penetration direction, is made of a metal plate having a constant width in the penetration direction, and has a corner forming portion and two plate portions that protrude perpendicularly from the corner forming portion and have a constant width in the protruding direction,
The plurality of peripheral wall constituents are adjacent to each other so that the protruding direction extends in the circumferential direction,
A sleeve installation method comprising the step of overlapping a tip end of the plate portion of one of the two adjacent peripheral wall constituents with a tip end of the plate portion of the other peripheral wall constituent in a plate thickness direction to form the sleeve having the peripheral wall.

<Appendix 6>
A method for installing a sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction, the method comprising:
The sleeve includes a peripheral wall formed in a rectangular frame shape by combining a first peripheral wall constituent, a second peripheral wall constituent, a third peripheral wall constituent, and a fourth peripheral wall constituent, and when a direction in which an internal space surrounded by the peripheral wall opens is defined as a penetration direction, each of the four peripheral wall constituents is L-shaped when viewed along the penetration direction, is made of a metal plate having a constant width in the penetration direction, and has an angular forming portion and two plate portions that protrude from the angular forming portion perpendicular to each other and have a constant width in the protruding direction,
the first circumferential wall constituent is arranged so that the corner forming portion is aligned with a first corner that is one of the four corners of the through hole, the corner forming portion of the second circumferential wall constituent is aligned with a second corner adjacent to the first corner, and the first circumferential wall constituent and the second circumferential wall constituent are arranged so that a tip end portion of the plate portion of the first circumferential wall constituent and a tip end portion of the plate portion of the second circumferential wall constituent overlap on an inner surface between the first corner and the second corner, and the first circumferential wall constituent and the second circumferential wall constituent are joined together;
the corner forming portion of the third circumferential wall constituent is aligned with a third corner adjacent to the second corner, and the tip end portion of the plate portion of the second circumferential wall constituent and the tip end portion of the plate portion of the third circumferential wall constituent are arranged so as to overlap on an inner surface between the second corner and the third corner, thereby joining the second circumferential wall constituent and the third circumferential wall constituent,
a sleeve installation method comprising: aligning the corner forming portion of the fourth circumferential wall constituent with a fourth corner adjacent to the third corner; arranging the fourth circumferential wall constituent so that a tip end of the plate portion of the third circumferential wall constituent and a tip end of the plate portion of the fourth circumferential wall constituent overlap on an inner surface between the third corner and the fourth corner; joining the third circumferential wall constituent and the fourth circumferential wall constituent; and arranging the fourth circumferential wall constituent so that a tip end of the plate portion of the fourth circumferential wall constituent and a tip end of the plate portion of the first circumferential wall constituent overlap on an inner surface between the fourth corner and the first corner.

<Appendix 7>
The joining member is a bolt that passes through both of the plate portions with the direction in which the tip ends of the plate portions overlap as the screw forward/backward direction, and the peripheral wall structure has a plurality of holes in the circumferential direction through which the bolts pass.
<Appendix 8>
A method for installing a sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction, the method comprising:
The sleeve has a peripheral wall formed by combining four peripheral wall constituent bodies into a rectangular frame shape,
If the direction in which the internal space surrounded by the peripheral wall opens is defined as a penetration direction, and the direction in which the internal space is surrounded is defined as a circumferential direction,
Four peripheral wall constituents are arranged in the through hole, each of which is L-shaped when viewed along the penetration direction, is made of a metal plate having a constant width in the penetration direction, and has an angle forming portion and two plate portions that protrude perpendicularly from the angle forming portion and have a constant width in the protruding direction,
The plurality of peripheral wall constituents are adjacent to each other so that the protruding direction extends in the circumferential direction,
A sleeve installation method comprising the step of overlapping a tip end of the plate portion of one of the two adjacent peripheral wall constituents with a tip end of the plate portion of the other peripheral wall constituent in a plate thickness direction to form the sleeve having the peripheral wall.
<Appendix 9>
A method for installing a sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction, the method comprising:
The sleeve has a peripheral wall formed into a rectangular frame shape by combining four peripheral wall constituent bodies,
an outer blocking member having a thickness greater than the dimension in the thickness direction of the peripheral wall constituent member and capable of being compressed and deformed in the thickness direction by an amount of compression equal to or greater than the thickness of the peripheral wall constituent member is disposed along an inner surface of the through hole penetrating the partition wall;
If the direction in which the internal space surrounded by the peripheral wall opens is defined as a penetration direction, and the direction in which the internal space is surrounded is defined as a circumferential direction,
The peripheral wall constructing member is L-shaped when viewed along the through-hole direction, is made of a metal plate having a constant width in the through-hole direction, and has a corner forming portion and two plate portions that protrude perpendicularly from the corner forming portion and have a constant width in the protruding direction, and is disposed in the through-hole;
The plurality of peripheral wall constituents are adjacent to each other so that the protruding direction extends in the circumferential direction,
a sleeve installation method comprising the steps of overlapping a tip end of the plate portion of one of the two adjacent peripheral wall constituents with a tip end of the plate portion of the other peripheral wall constituent in a plate thickness direction of both tip ends, changing the amount of overlap of both tip ends while compressing the outer blocking member, and joining both tip ends to form the sleeve comprising the peripheral wall.

F...floor panel as a partition wall, K...internal space, W...fire-resistant hollow wall as a partition wall, 13...fluid pipe as a penetrating member, Fa, 14...through hole, 16...external blocking member, 20, 70, 82...sleeve, 21, 71, 83...peripheral wall, 22, 72...side wall, 30...bending member as a peripheral wall constituent member, 31, 86, 91...first plate portion, 32, 87, 92...second plate portion, 33, 88, 93...angle forming portion, 50...maintenance member and joining member, 80...straight portion forming member as a peripheral wall constituent member, 83a...side Long side wall as wall, 83b...short side wall as side wall, 84...flange, 85...outer polymer, 85a...outer overlapping step as guide portion, 89, 102...outer flange forming portion, 90...inner polymer, 90a...inner overlapping step as guide portion, 94, 107...inner flange forming portion, 100...outer straight portion forming body as second straight portion forming body, 103...outer bulge portion as guide portion, 105...inner straight portion forming body as first straight portion forming body, 108...inner bulge portion as guide portion.

Claims (10)

A sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction,
A peripheral wall is formed into a rectangular frame shape by combining a plurality of peripheral wall constituent members made of metal plates,
The peripheral wall structure has four bending members and two or four straight portion forming members,
If the direction in which the internal space surrounded by the peripheral wall opens is defined as the penetration direction of the peripheral wall,
Each of the four bending members is L-shaped when viewed along the penetration direction, is made of a metal plate having a constant width in the penetration direction, and has a corner forming portion and two plate portions that protrude perpendicularly from the corner forming portion and have a constant width in the protruding direction,
The straight portion forming body has a shape extending with the constant width,
The peripheral wall has four side walls;
At least two of the four side walls are composed of a tip end portion of the plate portion of one of the two bending members positioned apart in the circumferential direction of the peripheral wall, a tip end portion of the plate portion of the other of the two bending members positioned apart in the circumferential direction of the peripheral wall, and the straight portion forming body overlapped in the plate thickness direction from the inside or outside of the rectangular frame shape with respect to both tip ends so as to connect the two tip ends,
A sleeve characterized in that the internal space is expanded or contracted by changing the overlap length in the protruding direction. A sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction,
A peripheral wall is formed into a rectangular frame shape by combining a plurality of peripheral wall constituent members made of metal plates,
The peripheral wall structure has four bending members and two or four straight portion forming members,
If the direction in which the internal space surrounded by the peripheral wall opens is defined as the penetration direction of the peripheral wall,
Each of the four bending members is L-shaped when viewed along the penetration direction, is made of a metal plate having a constant width in the penetration direction, and has a corner forming portion and two plate portions that protrude perpendicularly from the corner forming portion and have a constant width in the protruding direction,
The straight portion forming body has a shape extending with the constant width,
The peripheral wall has four side walls;
At least two of the four side walls are composed of a tip end portion of the plate portion of one of the two bending members positioned apart in the circumferential direction of the peripheral wall, a tip end portion of the other plate portion, and the straight portion forming body overlapped with both tip ends in the plate thickness direction so as to connect the two tip ends,
A sleeve characterized in that the internal space can be expanded or contracted by changing the overlap length in the protruding direction to form the rectangular frame shape of different sizes . A sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction,
A peripheral wall is formed into a rectangular frame shape by combining a plurality of peripheral wall constituent members made of metal plates,
The peripheral wall structure has four bending members and two or four straight portion forming members,
If the direction in which the internal space surrounded by the peripheral wall opens is defined as the penetration direction of the peripheral wall,
Each of the four bending members is L-shaped when viewed along the penetration direction, is made of a metal plate having a constant width in the penetration direction, and has a corner forming portion and two plate portions that protrude perpendicularly from the corner forming portion and have a constant width in the protruding direction,
The straight portion forming body has a shape extending with the constant width,
The peripheral wall has four side walls;
At least two of the four side walls are composed of a tip end portion of the plate portion of one of the two bending members positioned apart in the circumferential direction of the peripheral wall, a tip end portion of the other plate portion, and the straight portion forming body overlapped with both tip ends in the plate thickness direction so as to connect the two tip ends,
The internal space is expanded or contracted by changing the overlap length in the protruding direction ,
The peripheral wall has a rectangular frame-shaped flange that protrudes outward from the peripheral wall at one end edge in the penetration direction, and all of the plurality of peripheral wall constituents have plate-shaped flange forming portions that form the flange at one end edge in the penetration direction, and two flange forming portions adjacent to each other in the circumferential direction are overlapped in the plate thickness direction of the flange forming portions,
The peripheral wall includes two sets of two side walls facing each other among the four side walls,
Each of the two side walls of one of the sets is constituted by two of the bending members and one of the straight portion forming bodies, and each of the side walls of the other set is constituted by two of the bending members of one of the sets that face each other across the internal space,
In one of the two side walls of one of the sets, the two bending members positioned apart in the circumferential direction are outer polymers that overlap with the first straight portion forming body connecting the two bending members on the outside of the rectangular frame shape, and the flange forming portion is overlapped on the other end edge side in the penetration direction relative to the flange forming portion of the first straight portion forming body,
In the other side wall of one of the two side walls of the pair, the two bending members positioned apart in the circumferential direction are inner polymers that are polymerized on the inside of the rectangular frame shape with respect to the second straight portion forming body connecting the two bending members, and the flange forming portion is polymerized on one end edge side in the penetration direction relative to the flange forming portion of the second straight portion forming body,
A sleeve characterized in that in each of the two side walls of the other set, the tip of the plate portion of the outer polymer is overlapped so as to be more outer than the tip of the plate portion of the inner polymer . A sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction,
A peripheral wall is provided which is formed into a rectangular frame shape by combining a plurality of peripheral wall constituent bodies made of metal plates, and the direction in which an internal space surrounded by the peripheral wall opens is defined as the penetration direction of the peripheral wall.
The peripheral wall has flanges that protrude outward from both end edges in the penetration direction ,
The peripheral wall structure has four bending members,
Each of the four bending members is L-shaped when viewed along the penetration direction, is made of a metal plate having a constant width in the penetration direction, and has a corner forming portion, two plate portions that protrude perpendicularly from the corner forming portion and have a constant width in the protruding direction, and a plate-shaped flange forming portion that forms the flange,
The four bending members are arranged such that the protruding direction of the plate portions from the corner forming portion is the circumferential direction of the peripheral wall, and the plate portions of the bending members adjacent to each other in the circumferential direction are overlapped in the plate thickness direction, so that the peripheral wall is formed into the rectangular frame shape, thereby constituting four side walls,
The two flange forming portions adjacent to each other in the circumferential direction are overlapped in the plate thickness direction of the flange forming portions,
The sleeve is capable of changing the expansion and contraction of the internal space by changing the overlap length in the protruding direction,
two of the four bending members that are located at one diagonal corner and spaced apart in the circumferential direction of the peripheral wall are outer polymers that polymerize with the two bending members that are located at the other diagonal corner on the outside of the rectangular frame shape, and the two bending members that are located at the other diagonal corner are inner polymers that polymerize with the outer polymer on the inside of the rectangular frame shape,
the flange forming portion at one of the both end edges of the inner polymer overlaps with the flange forming portion at one end edge of the both end edges of the outer polymer at one end side in the penetration direction,
A sleeve characterized in that the flange forming portion at the other end edge of the inner polymer overlaps with the flange forming portion at the other end edge of the outer polymer at the other end side in the penetration direction. A sleeve as described in claim 3 or claim 4, wherein one of the overlapping flange forming portions is formed in a stepped shape in the plate thickness direction, and the other of the overlapping flange forming portions overlaps with the step of one of the flange forming portions, so that the overlapping flange forming portions are flush with each other. A sleeve as described in any one of claims 1 to 5, wherein the length from the base end to the tip of one of the two plate portions of the peripheral wall constituent is different from the length from the base end to the tip of the other plate portion. A sleeve as described in any one of claims 1 to 6, comprising an outer blocking member that has a thickness greater than the thickness dimension of the peripheral wall constituent and is compressible and deformable in the thickness direction by an amount equal to or greater than the thickness of the peripheral wall constituent. a penetrating member is disposed in a through hole that penetrates the partition wall in a wall thickness direction and has a rectangular shape when viewed in the wall thickness direction;
The penetrating member is surrounded by the sleeve according to any one of claims 1 to 7, which is disposed in the through hole;
The sleeve is formed in a rectangular frame shape by combining a plurality of peripheral wall constituent bodies,
Each of the plurality of peripheral wall constituents is made of a metal plate having a constant width in the penetration direction,
The two peripheral wall constituents adjacent to each other in the circumferential direction of the peripheral wall have tip portions overlapping each other in the plate thickness direction of the peripheral wall constituents,
A through-hole structure characterized in that an outer blocking member compressively deformed in the thickness direction of the peripheral wall constituent body is disposed between the overlapped peripheral wall constituent body and the inner surface of the through-hole. The partition wall is a hollow wall formed by a pair of partition walls that form a cavity therebetween, and a penetrating member is disposed in a through hole that penetrates the hollow wall in a wall thickness direction and has a rectangular shape when viewed in the wall thickness direction,
The penetrating member is surrounded by the sleeve according to any one of claims 1 to 7, which is disposed in the through hole;
Each of the plurality of peripheral wall constituents is made of a metal plate having a constant width in the penetration direction that is greater than the wall thickness of the hollow wall,
A through-hole structure characterized in that two peripheral wall constituents adjacent to each other in the circumferential direction of the peripheral wall are positioned in the hollow wall with their tip portions overlapping each other in the plate thickness direction of the peripheral wall constituents. The through hole structure according to claim 9, wherein one end of the sleeve in the penetration direction protrudes from the surface of the partition wall, and the sleeve is positioned relative to the partition wall by positioning tape attached across the outer surface of the sleeve protruding from the partition wall and the surface of the partition wall .