JP7180897B2 - foundation penetrating sleeve - Google Patents

Description

The present invention relates to a foundation penetration sleeve installed to penetrate the foundation of a building.

BACKGROUND ART Conventionally, there are cases in which through-holes are formed in the foundation of a building for pipes to pass from the outside to the inside or from the inside to the outside. When forming this through-hole, a void tube made of a tubular member made of paper, or a tubular member made of resin, metal, or ceramics disclosed in Patent Document 1 is used.

When forming a foundation through-hole using the tubular member, first, the tubular member is fixed to the reinforcing bar before pouring the concrete that constitutes the foundation. Then, formwork is installed so as to close the indoor-side opening and the outdoor-side opening of the tubular member. Concrete is poured into the installed formwork, and the formwork is removed after the concrete hardens. Then, when the void tube is used, the void tube is removed, but when the tubular member of Patent Document 1 is used, the tubular member is left.

Japanese Patent No. 5175655

By the way, since the cylindrical member of Patent Document 1 is made of resin, metal, or ceramics, it does not need to be removed unlike the void tube, and there is an advantage of good workability during construction.

However, there is a concern that concrete may enter the interior of the cylindrical member during placement. That is, when installing the formwork, the formwork is brought into contact with the indoor end surface of the tubular member so that the inner surface of one formwork closes the indoor-side opening of the tubular member, and , and the other mold frame is brought into contact with the outdoor end surface of the tubular member so that the inner surface of the other mold closes the outdoor opening of the tubular member. However, the cylindrical member is made of a hard material such as resin, metal, or ceramics and is not easily deformed. Gaps are likely to form between the inner surface of the formwork. If there is a gap between the end surface of the tubular member and the inner surface of the formwork, the cast concrete enters the tubular member through the gap and solidifies, hindering the formation of the foundation through-hole. Sometimes. In order to solve this problem, it is possible to remove the concrete that has solidified inside the tubular member. .

The present invention has been made in view of this point, and its object is to make it difficult for concrete to enter the inside of a cylindrical member that forms a foundation through-hole at the time of placing, so that a desired foundation through-hole is formed. to be able to form

In order to achieve the above object, a first invention provides a foundation penetration sleeve for forming a through hole for passing a pipe through a concrete foundation, which extends in the thickness direction of the foundation and has a tubular shape having the through hole. a member, a first annular packing made of an elastic material provided at the peripheral edge of the one end opening of the tubular member and in contact with the inner surface of one of the molds, and a peripheral edge of the other end opening of the tubular member. A second annular packing made of an elastic material that is provided and is in contact with the inner surface of the other formwork, and an anti-termite material that is provided so as to surround the outer peripheral surface of the cylindrical member and contains an anti-termite component. characterized by

According to this configuration, when the through-hole is formed in the foundation by the foundation-penetrating sleeve, the cylindrical member is fixed to a reinforcing bar or the like, and the molds are formed on the one end opening side and the other end opening side of the cylindrical member, respectively. Install a frame. Since the first annular packing is arranged around the peripheral edge of the one end opening, the first annular packing abuts against the inner surface of one of the molds to seal the peripheral edge of the one end opening of the cylindrical member. be. In addition, since the second annular packing is provided on the peripheral edge of the other end opening, the second annular packing comes into contact with the inner surface of the other formwork, and the peripheral edge of the other end opening of the tubular member part is sealed. This makes it difficult for the concrete to enter the tubular member when it is poured, so that the formation of the foundation through-hole is not hindered.

Further, after the concrete has solidified, the anti-termite material is interposed between the cylindrical member and the concrete, so that a high anti-termite effect can be obtained.

Further, an intermediate portion of the cylindrical member in the center line direction is a fixed portion to be fixed to a reinforcing bar of a foundation, and the termite-preventing material is composed of a butyl rubber sheet material containing a termite-preventing component. It is characterized in that it is provided so as to deviate from the fixed portion of the member in one direction of the center line.

According to this configuration, by fixing the central portion of the cylindrical member to the reinforcing bar, the cylindrical member can be stabilized when concrete is placed. Then, the anti-termite material can be positioned so as not to interfere with fixing to the reinforcing bars.

A second aspect of the invention is characterized in that the first annular packing and the second annular packing are made of an elastic material containing an anti-termite component. According to this configuration, the anti-termite effect can be further enhanced.

In the third invention, the tubular member has the one end opening disposed on the outdoor side of the foundation, and the first annular packing extends circumferentially along the one end opening side on the outer peripheral surface of the tubular member. and an annular first covering portion extending radially inward from one end of the first annular portion, wherein the hole formed by the first covering portion corresponds to the through hole characterized by being in communication with

According to this configuration, the first annular packing can be attached to the tubular member by inserting the one end opening side of the tubular member into the first annular portion. In this state, the radially outer portion of the one-end opening is covered by the first cover, but since the hole is formed by the first cover, the pipe is passed through the through hole by inserting the pipe into the hole. be able to. At this time, the tubular member and the pipe can be sealed by bringing the first cover portion into contact with the outer peripheral surface of the pipe.

A fourth aspect of the present invention is characterized in that the first annular portion is formed with an annular first projection that projects in the direction of the center line and abuts against the inner surface of the one formwork.

According to this configuration, by bringing the first protruding portion into contact with the inner surface of one of the molds, it becomes difficult for a gap to form between the first projecting portion and the mold, and the sealing performance can be further improved.

In a fifth aspect of the invention, the second annular packing includes a second annular portion extending in the circumferential direction along the other end opening side of the outer peripheral surface of the tubular member, and a second annular portion extending from the other end portion of the second annular portion. an annular second covering portion extending radially inward; a hole formed by the second covering portion communicates with the through hole; It is characterized in that it is set thinner than the thickness of the annular portion.

According to this configuration, the second annular packing is provided on the indoor side of the foundation. The second annular packing provided on the indoor side may require lower sealing performance than the first annular packing provided on the outdoor side because it is not exposed to the outside. The cost of the second annular packing can be reduced by making the thickness of the second annular portion thinner than that of the first annular portion so as to correspond to the required difference in sealing performance.

A sixth aspect of the invention is characterized in that the thickness of the second cover portion is set thinner than the thickness of the first cover portion.

According to this configuration, the second annular packing provided on the indoor side may require lower sealing performance than the first annular packing provided on the outdoor side. Even if it is thin, there is no problem in sealing performance, and the cost of the second annular packing can be reduced.

According to the present invention, the first annular packing is provided on the peripheral edge of the opening at one end of the tubular member having the through hole, and the second annular packing is provided on the peripheral edge of the opening on the other end. is less likely to enter the cylindrical member, and a desired base through-hole can be formed.

FIG. 3 is a cross-sectional view showing an example of a foundation in which a foundation through hole is formed using a foundation penetration sleeve according to an embodiment of the present invention; FIG. 11 is a side view of a foundation penetrating sleeve; FIG. 3 is a longitudinal section through the base penetrating sleeve; It is the figure which looked at the base penetration sleeve from the outdoor side. It is the figure which looked at the base penetration sleeve from the indoor side. It is a longitudinal cross-sectional view of the base penetration sleeve which concerns on a modification. It is a figure which shows the state which installed the reinforcing bar. It is a figure which shows the state which fixed the foundation penetration sleeve to the reinforcing bar. It is a figure which shows the state which installed the formwork. FIG. 2 is a vertical cross-sectional view of a foundation formed by solidifying concrete after placement;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail based on the drawings. It should be noted that the following description of preferred embodiments is essentially merely illustrative, and is not intended to limit the invention, its applications, or its uses.

FIG. 1 is a cross-sectional view showing an example of a foundation 100 in which a foundation through-hole 10 is formed using a foundation through-sleeve 1 according to an embodiment of the present invention. In FIG. 1, reference numeral 300 indicates the ground. The foundation 100 is a foundation for a building such as a house, an office, a warehouse, or the like. Foundation 100 has an outdoor side facing the outdoors (right side in FIG. 1) and an indoor side facing indoors (left side in FIG. 1). The thickness of the foundation 100 can be set to any thickness according to the building or the like, and the height of the foundation 100 can also be set to any height according to the building or the like.

A foundation through hole 10 formed by the foundation penetration sleeve 1 is a hole for passing a pipe 200, for example, from the indoor side to the outdoor side or from the outdoor side to the indoor side. The pipe 200 may be, for example, a vinyl chloride pipe made of vinyl chloride, but is not limited to this, and may be, for example, a bendable pipe such as a hose, or a pipe through which electrical wiring and communication lines pass. may The diameter of the base through-hole 10 may be set according to the diameter of the pipe passing therethrough, and is generally set to a diameter sufficiently larger than the diameter of the pipe.

The foundation 100 has a plurality of main reinforcing bars 400 extending in the vertical direction and a plurality of distributing reinforcing bars 401 extending in the horizontal direction. A plurality of main reinforcements 400 are provided at intervals in the direction in which the foundation 100 extends. In addition, the plurality of distributing reinforcements 401 extend horizontally so as to connect the main reinforcements 400 and are spaced apart from each other in the vertical direction. The main reinforcing bars 400 and the distributing bars 401 are so-called reinforcing bars.

The foundation 100 also has a concrete portion 403 . The main reinforcing bars 400 and the distributing bars 401 are embedded in the concrete portion 403 . The thickness direction of the foundation 100 is the horizontal direction in FIG.

(Structure of foundation penetrating sleeve 1)
As shown in FIGS. 2 and 3, the base penetrating sleeve 1 extends in the thickness direction of the base 100 and includes a tubular member 2 having a through hole 10, an outdoor side annular packing (first annular packing) 3, a roof An inner annular packing (second annular packing) 4 and an anti-termite material 5 are provided. The tubular member 2 can be configured by a tubular member made of, for example, a hard resin material, a metal material, or the like. The tubular member 2 may have sufficient rigidity to prevent deformation due to the weight and flow pressure of the concrete when the concrete is placed, which will be described later. For example, a vinyl chloride pipe made of vinyl chloride can be used.

As shown in FIG. 1, the length of the tubular member 2 is set so that the tubular member 2 reaches from the vicinity of the outdoor surface of the foundation 100 to the vicinity of the indoor surface. The diameter of the tubular member 2 is the same from the indoor side to the outdoor side. The thickness of the cylindrical member 2 can be, for example, several millimeters or more.

An opening located on the outdoor side of the cylindrical member 2 is an outdoor side opening (one end side opening) 2a. On the other hand, the opening located on the indoor side of the cylindrical member 2 is an indoor side opening (other end side opening) 2b.

A central portion of the cylindrical member 2 in the center line direction is a portion to be fixed 2 c that is fixed to the force distributing bar 401 of the foundation 100 . The fixed portion 2c may include the central portion of the cylindrical member 2 in the center line direction, may be a portion deviating from the central portion toward the indoor side, or may be a portion deviating from the central portion toward the outdoor side. There may be. Further, the fixed portion 2 c may be a predetermined region that spreads in the center line direction, and a part of this region can be fixed to the force distribution reinforcement 401 .

A fixture 410 can be used to fix the fixed portion 2 c to the force distributing bar 401 . The fixture 410 includes an upper engaging portion 410a that engages with the force distributing bar 401, and a ring-shaped portion 410b that surrounds the outer peripheral surface of the fixed portion 2c. The annular portion 410b can be fixed to the fixed portion 2c by tightening the outer peripheral surface of the fixed portion 2c. The upper portion of the ring-shaped portion 410b is integrated with the lower portion of the upper engaging portion 410a. The upper engaging portion 410 a may be configured to bind to the force distribution muscle 401 . The fixture 410 may be composed of, for example, wire for binding such as cord wire, or may be composed of a sheet metal member.

The outdoor-side annular packing 3 is provided on the periphery of the outdoor-side opening 2a of the tubular member 2, and is a member that contacts the inner surface of the outdoor-side formwork (one formwork) 450 shown in FIG. . Examples of the material forming the outdoor-side annular packing 3 include elastic materials such as rubber such as ethylene propylene rubber (EPT) and thermoplastic elastomers. The elastic material contains an anti-termite component. An anti-termite component is a component for preventing ants from invading from the outdoors, and is a conventionally well-known component. Also, conventionally well-known methods can be used for the method of incorporating the anti-termite component into the elastic material.

The outdoor-side annular packing 3 includes an outdoor-side annular portion (first annular portion) 3a extending in the circumferential direction along the outdoor-side opening 2a side of the outer peripheral surface of the tubular member 2, and an outdoor-side of the outdoor-side annular portion 3a. and an annular outdoor-side cover portion (first cover portion) 3b extending radially inward from an end (one end) of the outdoor-side opening 2a to cover the radially outer portion of the outdoor-side opening 2a. The outdoor side of the tubular member 2 is fitted inside the outdoor-side annular portion 3a. can be attached to the shaped member 2 . In this attached state, the inner surface of the outdoor-side annular packing 3 and the outer peripheral surface of the tubular member 2 are in close contact with each other, ensuring watertightness. The center line of the outdoor-side annular packing 3 and the center line of the tubular member 2 are aligned.

As also shown in FIG. 4, the outdoor side cover portion 3b has an annular shape, and a circular hole 3c is formed in the central portion. The hole 3 c communicates with the outdoor side of the through hole 10 formed inside the cylindrical member 2 . The center of the hole 3c and the centerline of the tubular member 2 are positioned on the same straight line. The diameter of the hole 3c is set smaller than the outer diameter of the pipe 200, so that the outer peripheral surface of the pipe 200 contacts the outdoor side cover portion 3b. Thereby, the space between the pipe 200 and the tubular member 2 can be sealed by the outdoor-side annular packing 3 .

The extension direction tip part of the outdoor side cover part 3b is a part which forms the internal peripheral surface of the hole 3c. As shown in FIG. 3, a protrusion 3d that protrudes radially inward and extends continuously in the circumferential direction is provided at the leading end in the extension direction of the outdoor side cover portion 3b. A plurality of protrusions 3d can be provided so as to be aligned in the center line direction of the outdoor-side annular packing 3, but only one protrusion may be provided. The portion that contacts the outer peripheral surface of the pipe 200 may be only the tip portion of the protrusion 3d. Since the protruding portion 3d is made of an elastic material, it can be elastically deformed along the outer peripheral surface of the pipe 200 in contact with the outer peripheral surface of the pipe 200 to eliminate the gap.

An outdoor projection (first projection) 3e is formed in an annular shape on the outdoor annular portion 3a so as to project toward the outdoor side in the direction of the center line and contact the inner surface of the mold 450 on the outdoor side. The outdoor-side projecting portion 3e is continuous in the circumferential direction of the outdoor-side annular portion 3a, and is elastically deformed by coming into contact with the inner surface of the outdoor-side formwork 450, resulting in a gap with the inner surface of the outdoor-side formwork 450. can be eliminated.

The indoor-side annular packing 4 is provided on the periphery of the indoor-side opening 2b of the tubular member 2, and is a member that contacts the inner surface of the indoor-side formwork (the other formwork) 451 shown in FIG. . The same material as that of the outdoor annular packing 3 can be used for the indoor annular packing 4, but the material may be changed.

The indoor-side annular packing 4 includes an indoor-side annular portion (second annular portion) 4a extending in the circumferential direction along the indoor-side opening 2b side of the outer peripheral surface of the tubular member 2, and an indoor-side of the indoor-side annular portion 4a. and an annular indoor side cover portion (second cover portion) 4b extending radially inward from the end portion (the other end portion) of to cover the radially outer portion of the indoor side opening portion 2b. The indoor side of the tubular member 2 is fitted inside the indoor-side annular portion 4a. can be attached to the shaped member 2 . In this attached state, the inner surface of the indoor-side annular packing 4 and the outer peripheral surface of the cylindrical member 2 are in close contact with each other, ensuring watertightness. The center line of the indoor-side annular packing 4 and the center line of the tubular member 2 are aligned.

As also shown in FIG. 5, the indoor side cover portion 4b has an annular shape, and a circular hole 4c is formed in the central portion. The hole 4 c communicates with the indoor side of the through hole 10 formed inside the cylindrical member 2 . The center of the hole 4c and the centerline of the cylindrical member 2 are positioned on the same straight line. As shown in FIG. 1, the diameter of the hole 4c is set smaller than the outer diameter of the pipe 200, so that the outer peripheral surface of the pipe 200 contacts the indoor cover portion 4b. Thereby, the space between the pipe 200 and the tubular member 2 can be sealed by the indoor-side annular packing 4 . The leading end portion of the indoor side cover portion 4b in the extending direction is a portion that forms the inner peripheral surface of the hole 4c, and is made of an elastic material. The gap can be eliminated by elastic deformation.

The indoor-side annular portion 4a is provided with an annular indoor-side projecting portion (second projecting portion) 4e that projects toward the outdoor side in the direction of the center line and contacts the inner surface of the indoor-side formwork 451 . The indoor-side projecting portion 4e is continuous in the circumferential direction of the indoor-side annular portion 4a, and is elastically deformed by coming into contact with the inner surface of the indoor-side formwork 451, creating a gap between the indoor-side projecting portion 4e and the inner surface of the indoor-side formwork 451. can be eliminated.

The thickness of the indoor-side annular portion 4a is set thinner than the thickness of the outdoor-side annular portion 3a. That is, the indoor-side annular packing 4 is not exposed to the outside as compared with the outdoor-side annular packing 3, and thus the required sealing performance may be lower. The cost of the indoor-side annular packing 4 can be reduced by making the indoor-side annular portion 4a thinner than the outdoor-side annular portion 3a so as to correspond to the required difference in sealing performance.

The thickness of the indoor side cover portion 4b is set thinner than the thickness of the outdoor side cover portion 3b. As described above, the indoor-side annular packing 4 may require lower sealing performance than the outdoor-side annular packing 3, so even if the thickness of the indoor-side cover portion 4b is thin, there is a problem in sealing performance. Therefore, the cost of the indoor-side annular packing 4 can be reduced.

The thickness of the indoor side annular portion 4a and the thickness of the outdoor side annular portion 3a may be equal. Further, the thickness of the indoor side cover portion 4b and the thickness of the outdoor side cover portion 3b may be equal.

As shown in FIG. 2, the anti-termite material 5 is made of a sheet material made of butyl rubber containing an anti-termite component, and is a conventionally well-known member. An example of a butyl rubber containing an anti-termite component is disclosed in Japanese Patent No. 5537061. The thickness of the anti-termite material 5 can be set to, for example, about 3 mm, and the width of the anti-termite material 5 can be set to about 100 mm. The anti-termite material 5 is provided so as to surround the outer peripheral surface of the tubular member 2, and is in close contact with the outer peripheral surface of the tubular member 2 without any gap. A gap is not formed between them. As a result, outdoor ants are prevented from entering the room from between the foundation-penetrating sleeve 1 and the foundation 100 .

The anti-termite material 5 is provided so as to deviate from the fixed portion 2c of the cylindrical member 2 in one direction of the center line. In this embodiment, the termite-preventive material 5 is deviated toward the indoor side from the fixed portion 2c so that the termite-resistant material 5 does not become an obstacle when the fixed portion 2c is fixed to the force distribution bars 401. there is The anti-termite material 5 may be deviated to the outdoor side from the fixed portion 2c.

The shapes of the outdoor-side annular packing 3 and the indoor-side annular packing 4 are not limited to the above-described shapes, and may be modified, for example, as shown in FIG. In the modified example, the front end portion of the outdoor side cover portion 3b of the outdoor side annular packing 3 is formed thinner than the base end portion. Thereby, it becomes easy to deform|transform along the outer peripheral surface of the piping 200. FIG. In addition, the dimension in the extension direction of the indoor side cover portion 4b of the indoor side annular packing 4 is set short. The outdoor side cover portion 3b can be formed thinner toward the tip.

(Construction procedure)
Next, the procedure for constructing the foundation 100 using the foundation penetrating sleeve 1 configured as described above will be described. First, as shown in FIG. 7, the main reinforcement 400 and the distributing reinforcement 401 are installed. After that, as shown in FIG.

After fixing the base penetrating sleeve 1, the outdoor side formwork 450 and the indoor side formwork 451 are installed as shown in FIG. The inner surface of the outdoor-side formwork 450 abuts on the outdoor-side projecting portion 3 e of the outdoor-side annular packing 3 . Since the outdoor protrusion 3e is elastically deformed along the inner surface of the outdoor mold 450, the gap between the outdoor annular packing 3 and the inner surface of the outdoor mold 450 is eliminated.

In addition, the inner surface of the indoor-side formwork 451 abuts on the indoor-side projecting portion 4 e of the indoor-side annular packing 4 . The indoor-side protruding part 4 e is elastically deformed along the inner surface of the indoor-side formwork 451 , so that there is no gap between the inner surface of the indoor-side formwork 451 and the indoor-side annular packing 4 .

Next, concrete is placed between the outdoor-side formwork 450 and the indoor-side formwork 451 to flow. At this time, since the foundation penetrating sleeve 1 is fixed to the distributing bar 401, displacement of the foundation penetrating sleeve 1 due to the flow pressure of the concrete is suppressed. Moreover, since the rigidity of the cylindrical member 2 is sufficiently ensured, the cylindrical member 2 is not deformed by the weight of the concrete or the flow pressure. In addition, since there is no gap between the inner surface of the outdoor-side formwork 450 and the outdoor-side annular packing 3 and between the inner surface of the indoor-side formwork 451 and the indoor-side annular packing 4, the concrete is It becomes difficult to enter the inside of the

After the concrete has solidified, the outdoor side formwork 450 and the indoor side formwork 451 are removed to obtain the foundation 100 in which the foundation penetrating sleeve 1 is embedded as shown in FIG. Since it is difficult for concrete to enter the inside of the cylindrical member 2, the formation of the through hole 10 is not hindered, and the through hole 10 can be obtained as intended. Then, as shown in FIG. 1, the pipe 200 can be passed through the through hole 10 .

(Action and effect of the embodiment)
As described above, according to this embodiment, the outdoor annular packing 3 is provided on the periphery of the outdoor opening 2a of the tubular member 2 having the through hole 10, and the indoor opening 2b is surrounded by the outer annular packing. Since the outer annular packing 4 is provided, when the molds 450, 451 are installed, the gap between the molds 450, 451 and the outdoor side annular packing 3 and the outdoor side annular packing 4 can be eliminated. This makes it difficult for the concrete to enter the cylindrical member 2 during placement, and the desired through-hole 10 can be formed.

In addition, since the outdoor-side annular packing 3 and the outdoor-side annular packing 4 have an anti-termite effect, it is possible to enhance the effect of suppressing the intrusion of ants.

The above-described embodiments are merely examples in all respects and should not be construed in a restrictive manner. Furthermore, all modifications and changes within the equivalent range of claims are within the scope of the present invention.

INDUSTRIAL APPLICABILITY As described above, the base penetrating sleeve according to the present invention can be used, for example, when forming through holes in the bases of various buildings.

1 base penetrating sleeve 2 cylindrical member 2a outdoor side opening (one end side opening)
2b Indoor side opening (other end side opening)
2c Fixed portion 3 Outdoor-side annular packing (first annular packing)
3a Outdoor-side annular portion (first annular portion)
3b Outdoor side cover (first cover)
3c hole 3e outdoor projection (first projection)
4 Indoor-side annular packing (second annular packing)
4a Indoor side annular portion (second annular portion)
4b indoor side cover (second cover)
4c hole 4e indoor projection (second projection)
5 Ant-proof material 10 Foundation through hole 100 Foundation 200 Piping 450 Outdoor side formwork (one formwork)
451 Indoor formwork (other formwork)

Claims (6)

A base penetrating sleeve for forming a through hole for pipes in a concrete base,
a cylindrical member extending in the thickness direction of the base and having the through hole;
a first annular packing made of an elastic material provided on the peripheral edge of the one end opening of the cylindrical member and in contact with the inner surface of one mold;
a second annular packing made of an elastic material provided at the peripheral edge of the other end opening of the tubular member and in contact with the inner surface of the other formwork;
An anti-termite material containing an anti-termite component provided between the first annular packing and the second annular packing so as to surround the outer peripheral surface of the tubular member,
The first annular packing includes a first annular portion extending in the circumferential direction along the one end opening side of the outer peripheral surface of the tubular member,
The second annular packing has a second annular portion extending in the circumferential direction along the other end opening side of the outer peripheral surface of the tubular member,
An intermediate portion in the center line direction of the tubular member is a portion to be fixed to be fixed to the reinforcing bar of the foundation,
The anti-termite material is composed of a sheet material made of butyl rubber containing an anti-termite component, and is provided deviated from the fixed portion of the cylindrical member in one direction of the center line. through sleeve. A base penetration sleeve according to claim 1, wherein
The base penetrating sleeve, wherein the first annular packing and the second annular packing are made of an elastic material containing an anti-termite component. A base penetration sleeve according to claim 1 or 2,
The cylindrical member has the one end opening arranged on the outdoor side of the foundation,
The first annular packing includes an annular first covering portion extending radially inward from one end of the first annular portion,
A base through-sleeve, wherein a hole formed by said first covering portion communicates with said through-hole. A base penetration sleeve according to claim 3,
The base penetrating sleeve, wherein the first annular portion is annularly formed with a first protrusion that protrudes in the direction of the center line and abuts against the inner surface of the one formwork. A base penetration sleeve according to claim 3 or 4,
The second annular packing includes an annular second covering portion extending radially inward from the other end of the second annular portion ,
A hole formed by the second cover portion communicates with the through hole,
The base penetrating sleeve, wherein the thickness of the second annular portion is set thinner than the thickness of the first annular portion. A base penetration sleeve according to claim 5,
The base penetrating sleeve, wherein the thickness of the second covering portion is set thinner than the thickness of the first covering portion.

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