JP7499294B2 - Structural slit member and wall structure construction method - Google Patents

Description

The present invention relates to a structural slit member that is placed along the side edge of a wall body of a structure such as a building, and a method for constructing a wall body adjacent to a column body using the structural slit member.

As disclosed in Patent Documents 1 and 2, it is known that structural slits are provided in reinforced concrete buildings to separate the edges between columns and beams and walls, and serve to prevent brittle fracture of the building in the event of an earthquake.

Structural slits were included as a method of earthquake-resistant design in the 1981 Building Standards Act's "New Earthquake Resistance Standards," and are widely used in apartment buildings, mainly made of reinforced concrete. With typical structural slits, it is difficult to maintain or fix the shape of the slits to a certain height (for example, about 1.0m-1.5m) against the lateral pressure of the concrete, so a construction method is used in which concrete is poured in sequence on both sides of the structural slit.

JP 2007-186925 A JP 2012-67495 A

However, if the structural slits are not installed properly or if construction management during concrete pouring is not carried out properly, the structural slits may become bent or misaligned, requiring correction after construction.

The present invention aims to provide a structural slit member that can reduce the burden of construction management during concrete pouring and prevent bending or misalignment of the structural slit, as well as a method for constructing a wall structure adjacent to a column structure using the structural slit member.

In order to achieve the above-mentioned object, the structural slit member of the present invention is a structural slit member for arranging a structural slit along the side edge of the wall body of a structure, and is characterized by comprising: a band-shaped structural slit arranged on the side edge of the wall body; a precast section formed in a long shape from concrete on the inside side of the wall body along the structural slit; wall cross bars whose ends are embedded in the precast section and protrude toward the center of the wall body; and an insert embedded in the precast section so as to communicate with the through hole of the structural slit.

The inserts can be embedded in the precast section at intervals in the longitudinal direction. The precast section can have a vertical wall surface that is a part of the first wall surface of the wall structure, and no wall surface that is exposed at the position where the second wall surface of the wall structure facing the first wall surface is to be formed. Furthermore, it is preferable that a part of a separator that is connected to the wall formwork that forms the second wall surface is embedded in the precast section.

The invention of the method for constructing a wall structure is a method for constructing a wall structure adjacent to a column structure using any of the structural slit members described above, characterized by comprising the steps of: arranging the structural slit member at a position that is the boundary with the column structure; connecting the end of an intermediate support material inserted from the column structure side to the insert; and continuously filling the inside of the formwork of the wall structure in which the precast section is arranged and reinforced with concrete up to the height of the wall structure.

Another wall structure construction method invention is a method for constructing a wall structure adjacent to a column structure using any of the structural slit members described above, characterized by comprising the steps of: fabricating a wall unit by reinforcing the wall structure against the structural slit member; hoisting the wall unit and positioning it so that the structural slit member is located at the boundary with the column structure; connecting the end of an intermediate support material inserted from the column structure side to the insert; and continuously filling the wall unit placed inside the formwork of the wall structure with concrete up to the height of the wall structure.

The structural slit member of the present invention thus constructed comprises a precast section formed in a long shape from concrete along the structural slit, a wall cross bar whose end is embedded in the precast section, and an insert that communicates with the through hole of the structural slit.

In other words, the precast section added to increase the rigidity of the structural slit can be supported by intermediate supports connected to the insert from the outside of the wall structure, and can be integrated with the concrete of the wall structure that is filled in later via the wall cross bars.

This allows the concrete to withstand large lateral pressure, and allows concrete to be poured high in one go, reducing the burden of construction management during concrete pouring. Furthermore, the structural slits are supported by the highly rigid precast section, preventing bending and shifting.

In particular, if multiple inserts are embedded in the precast section at intervals along the length of the precast section, the structural slits located on the side edges of the wall structure can be supported without bias in the vertical direction.

In addition, if the precast section does not have any exposed wall surface on one side of the wall structure, the surface can be covered with concrete that is filled in later without creating any joints, so there is no need to apply sealants or other materials that would be required for joints on the exterior side of the wall.

Furthermore, if a portion of the separator connected to the wall formwork is embedded in the precast section, the wall formwork can be connected by the separator even at the position where the precast section is placed.

In addition, in the invention of the wall structure construction method, structural slit members are placed, the ends of the intermediate support members inserted from the column structure side are connected to the inserts, and then concrete is continuously filled up to the height of the wall structure.

In this way, by using structural slit members in which the highly rigid precast section is supported by intermediate supports, the height of the wall structure can be constructed with a single concrete pour, reducing the burden of construction management during concrete pouring.

Furthermore, if structural slit members are used to manufacture wall units by arranging the reinforcement for the wall structure using ground assembly, workability will improve, allowing the wall structure to be constructed more efficiently.

1 is an explanatory diagram of the process of constructing a wall structure adjacent to a column structure using the structural slit member of this embodiment. FIG. 1 is an explanatory diagram showing the schematic configuration of the wall and column structures of a building in which structural slits are arranged. FIG. FIG. 2 is a perspective view illustrating the relationship between the structural slit member of the present embodiment and wall reinforcement and column reinforcement. 1 is a perspective view illustrating the configuration of a wall unit manufactured using a pair of structural slit members. FIG. This is an explanatory diagram showing an enlarged view of the vicinity of the boundary with the column body. FIG. 11 is an explanatory diagram showing an example of the use of the structural slit member of this embodiment when constructing a wall structure on only one side of a column structure. FIG. 1 is an explanatory diagram illustrating a conventional concrete pouring sequence for columns and walls.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Fig. 1 is a diagram for explaining a process for constructing a column skeleton 11 and an adjacent wall skeleton 12 of a building 1, which is a structure, using a structural slit member 2 according to this embodiment. Fig. 2 is an explanatory diagram showing a schematic configuration of the wall skeleton 12 and column skeleton 11 of the building 1, in which a structural slit 3 is arranged.

In order to prevent brittle fracture, such as shear failure, of columns and beams in buildings 1 such as buildings and apartment buildings when a large earthquake occurs, structural slits are placed at the boundaries between columns and walls, as shown in Figure 2. The structural slits 3 shown in the figure are members that separate the edges between the column body 11 and the wall body 12, and are sometimes called vertical slits, vertical slits, earthquake-resistant slits, etc.

The structural slits 3 are arranged on the side edge 12a of the wall body 12, which forms the boundary with the column body 11. The wall body 12 is a body called a miscellaneous wall, such as a sleeve wall, waist wall, or hanging wall, which is different from the main structural members. On the other hand, as shown in FIG. 3, the structural slits arranged for the purpose of cutting the edge between the beam body 13 and the wall body 12 are called horizontal slits 15.

As shown in Figures 4 and 5, the structural slit member 2 of this embodiment comprises a band-shaped structural slit 3, a precast section 4 formed in an elongated shape along the structural slit 3, a wall cross bar 51 whose end is embedded in the precast section 4, and an insert 6 embedded in the precast section 4.

The structural slit 3 is a rectangular plate-shaped member made of a material such as polystyrene foam, urethane foam, polystyrene foam, or phenol foam. The structural slit 3 is formed in a long shape with a length approximately equal to the height of the wall structure 12.

As shown in Figure 5, the width of the structural slit 3 is narrower than the wall thickness of the wall structure 12 (approximately 150mm-230mm), and a frame material 32 is attached to each of the two edge portions in the wall thickness direction of the wall structure 12. The frame material 32 has grooves on both sides, and one groove fits the edge of the structural slit 3, while the other groove fits a rectangular joint rod 33 fixed to the wall formwork 72.

As shown in FIG. 5, a partition formed by the structural slit 3, frame material 32, and joint rod 33 described above is placed at the boundary between the pair of wall forms 72, 72 and the column structure 11, and the flow of concrete filled to construct the wall structure 12 and the column structure 11 is blocked by this partition.

The precast section 4 is formed in a long shape from concrete on the inside of the wall structure 12 along the longitudinal direction (vertical direction) of the structural slit 3. One side of the structural slit 3 is in close contact with the precast section 4, and part of the frame material 32 is embedded in it, so the precast section 4 and the structural slit 3 can be treated as a single unit.

The precast section 4 described in this embodiment is formed in an irregular trapezoidal shape in plan view, but is not limited to this and can also be formed in an approximate trapezoid or an approximate right-angled triangle in plan view. Here, as shown in Figure 5, one wall surface of the wall structure 12 is the first wall surface 121, and the other wall surface opposite it is the second wall surface 122.

The precast section 4 has a vertical wall surface 41 that is part of the first wall surface 121. That is, the side edge 12a of the wall structure 12 is formed by the vertical wall surface 41 of the precast section 4. In contrast, the wall surface of the precast section 4 is not exposed on the second wall surface 122 side of the wall structure 12. That is, the wall surface of the precast section 4 on the second wall surface 122 side is formed into an inclined surface 42 that tapers from the column structure 11 side toward the center of the wall structure 12 in a plan view.

Even at the position of the inclined surface 42 of the precast section 4 closest to the second wall surface 122, there is a distance of about the width of the joint rod 33, so the inclined surface 42 of the precast section 4 is covered by the concrete filled on the second wall surface 122 side.

In this way, the ends of the horizontally extending wall reinforcement bars 51 are embedded in the precast section 4, which is formed into a long length with a trapezoidal cross section. In other words, the wall reinforcement bars 51 protrude from the precast section 4 toward the center of the wall structure 12. Multiple wall reinforcement bars 51 are embedded at intervals in the longitudinal direction of the precast section 4.

In addition, as shown in Figure 5, an insert 6 is embedded in the precast section 4 on the rear side of the structural slit 3, which faces the column body 11. At the position of the structural slit 3 opposite this insert 6, a through hole 31 is drilled, as shown in Figure 4. In other words, the insert 6 is positioned so that it communicates with the through hole 31 of the structural slit 3.

As can be seen from the position of the through holes 31 shown in Figure 4, multiple inserts 6 are embedded at intervals in the longitudinal direction of the precast section 4. For example, the inserts 6 are embedded in the precast section 4 at intervals of about 200 mm to 400 mm in the vertical direction.

The end of the intermediate support material 61, which is inserted from the column body 11 side, is connected to this insert 6 (see Figure 1). The intermediate support material 61 can be made of a rod-shaped material such as a reinforcing bar, a separator, or a full screw. In addition, the intermediate support material 61 is not limited to being made of a single rod-shaped material, but may be made by combining multiple rod-shaped materials, such as by having joints in between.

The structural slit member 2 can be supported by the intermediate support member 61 connected to the insert 6. For this reason, it is preferable to arrange the inserts 6 closer together at the bottom of the structural slit member 2, where the lateral pressure of the concrete is greater, than at the top.

The structural slit member 2 of this embodiment is connected to the column body 11 by an intermediate support member 61 that is screwed into the insert 6. In conventional earthquake-resistant structures with structural slits, it was necessary to place anti-sway bars to prevent the wall that is separated from the column from collapsing, but by using the structural slit member 2 of this embodiment, in which the wall body 12 is connected to the column body 11 via the intermediate support member 61, the intermediate support member 61 can function as an anti-sway bar.

As shown in FIG. 5, a portion of a separator 52 connected to the wall formwork 72 forming the second wall surface 122 can be embedded in the precast section 4 with its end protruding. Multiple separators 52 are embedded at intervals in the longitudinal direction of the precast section 4. For example, the separators 52 are attached to the precast section 4 at intervals of about 200 mm to 400 mm in the vertical direction.

The separator 52 penetrates the precast section 4 in the direction between the opposing wall forms 72, 72, with one end fixed to the first wall surface 121 and the other end fixed to the second wall surface 122. In short, by having the separator 52 protrude from the precast section 4, the opposing wall forms 72, 72 can be easily connected by the separator 52 even in the position where the precast section 4 is placed.

Furthermore, as shown in FIG. 3, the precast section 4 has vertical wall reinforcement 53 protruding upward from its upper end. The vertical wall reinforcement 53 is used to connect to the beam structure 13. As shown in FIG. 4, the upper end of the wall reinforcement 123 also has vertical wall reinforcement 53 protruding upward.

Next, a method for constructing a wall structure 12 adjacent to a column structure 11 using the structural slit member 2 of this embodiment will be described. In this embodiment, as shown in Figure 1 or Figure 6, a case in which a wall structure 12 is constructed adjacent to a column structure 11 will be described.

The column reinforcement 111 of the column body 11 is made up of tie bars that act as shear reinforcement bars and surround the outside of the main bars that extend vertically. In addition, intermediate tie bars that act as shear reinforcement bars are placed across the tie bars, which are roughly rectangular in plan view, to separate the internal space (see Figures 1 and 3).

Before the structural slit member 2 is installed in a predetermined position, the wall formwork 72 that forms one wall surface of the wall structure 12 is assembled. For example, the upper wall formwork 72 that is connected to the column formwork 71 shown in Figure 1 is installed first. The formwork (71, 72) is made up of shoring 7, which is assembled using single pipes and battens, sheathing, separators 52, etc.

Then, column reinforcement 111 is assembled inside the column formwork 71, and wall reinforcement 123 is assembled inside the wall formwork 72. Structural slit members 2 are installed on both side edges of this wall reinforcement 123.

There are two ways to arrange the structural slit members 2 and wall reinforcement 123. The first method is to first arrange the structural slit members 2 at the boundary with the column body 11, and then assemble the wall reinforcement 123.

The second method is to assemble the wall unit 20 as shown in Figure 4 by ground assembly. For example, a lattice-shaped wall reinforcement 123 is assembled using horizontal and vertical reinforcement between a pair of structural slit members 2, 2 placed sideways at a distance in a work yard. If ground assembly is used, which can be carried out in a wide space such as a work yard, the wall reinforcement 123 can be assembled efficiently.

The structural slit member 2 or wall unit 20 is lifted by a hoist or crane and installed adjacent to the column body 11. Figure 3 is a perspective view illustrating the structural slit member 2 and wall reinforcement 123 installed adjacent to the column reinforcement 111.

As shown in FIG. 3, the wall cross bars 51 protruding from the precast portion 4 of the structural slit member 2 are arranged in the wall reinforcement 123 at intervals in the vertical direction, and the precast portion 4 can be integrated with the wall reinforcement 123 by the concrete poured afterwards.

The wall reinforcement 123 is placed on the floor surface formed on the beam structure 13 of the lower floor through a horizontal slit 15. In other words, the wall structure 12 and the floor surface are separated by the horizontal slit 15.

For the structural slit member 2 arranged at the boundary with the column body 11, as shown in Figure 1, one end of the intermediate support material 61 is screwed into the insert 6 through the through hole 31 (see Figure 4) from the column reinforcement 111 side.

In the building 1 shown in FIG. 1, the other end of the intermediate support member 61 is also screwed into the insert 6 of the structural slit member 2 for the wall structure 12 constructed on the opposite side of the column structure 11. In short, the intermediate support member 61 maintains the distance between the structural slit members 2, 2 on both sides of the column structure 11.

On the other hand, in the building 1A shown in Figure 6, the wall structure 12 is provided in only one direction relative to the column structure 11, so the other end of the intermediate support member 61, one end of which is screwed into the insert 6, is fixed to the support 7 that supports the column formwork 71.

After assembling the column reinforcement 111 and wall reinforcement 123 in this manner, the remaining column formwork 71 and wall formwork 72 are installed. When installing the wall formwork 72, in the precast section 4, as shown in FIG. 5, the protruding end of the separator 52 is connected to the wall formwork 72. In this way, the section is prepared for filling with cast-in-place concrete.

Now, with reference to Figure 7, we will explain the order in which concrete is poured into the columns, walls, and beams of a conventional building a1. In this building a1, structural slits a2 are placed between the columns and the walls on either side.

First, pour the concrete into the bottom of the column. Since concrete is fluid when filled, a lateral pressure according to the pouring height acts on the structural slit a2, as shown in the partial image in the center of the wall on the left side of Figure 7.

The structural slit a2 itself is a low-rigidity plate material made from polystyrene foam or similar, so if a large lateral pressure from the concrete is applied, it may bend or shift. Therefore, first pour concrete to about 1/3 of the height of the column.

Next, concrete is filled into the lower parts of the walls on the left and right of the pillar to the same height. Then, concrete is poured into the middle parts of the pillar and the walls on the left and right, and then concrete is poured into the upper parts of the pillar and the walls on the left and right. Finally, concrete is poured into the beams, and the concrete pouring process involves 10 steps.

In contrast, the structural slit member 2 of this embodiment has a highly rigid precast section 4, and the precast section 4 is supported by an intermediate support member 61 connected from the column body 11 side.

The intermediate support material 61 is inserted into the through hole 31 shown in Figure 4, and is placed not only at the vertical ends of the precast section 4 but also in the middle, so that the structural slit member 2 can be supported evenly over its entire length.

As a result, as shown in Figure 2, concrete can be poured continuously into the column structure 11 at one time up to a depth of about 2.5 m. Concrete can also be poured continuously into the wall structures 12 on the left and right sides of the column structure 11 up to the height of the wall structures 12.

Finally, the concrete for the beam structure 13 is poured, but the concrete pouring process can be completed in just four steps. In short, six steps can be eliminated compared to the conventional concrete pouring process.

Next, we will explain the function of the structural slit member 2 of this embodiment and the method of constructing a wall structure 12 adjacent to a column structure 11 using the structural slit member 2.

The structural slit member 2 of this embodiment configured in this manner includes a precast section 4 formed in a long shape from concrete along the structural slit 3, a wall cross bar 51 whose end is embedded in the precast section 4, and an insert 6 that communicates with the through hole 31 of the structural slit 3.

In other words, the precast section 4 added to the structural slit 3 to increase rigidity can be supported by intermediate supports 61 connected to the insert 6 from the outside of the wall structure 12, and can be integrated with the concrete of the wall structure 12 that is filled later via the wall cross bars 51.

If the concrete can withstand the large lateral pressure, it will be possible to continuously pour concrete to a height of more than 1.5m at a time, which will reduce the burden of construction management during concrete pouring.

Furthermore, because the structural slits 3 are supported by the highly rigid precast section 4, bending or shifting can be prevented. In particular, if multiple inserts 6 are embedded in the precast section 4 at intervals along the longitudinal direction of the precast section 4, the structural slits 3 located on the side edge 12a of the wall structure 12 can be supported without bias in the height direction.

In addition, if the precast section 4 does not have an exposed wall surface on one side of the wall structure 12 (second wall surface 122 in Figure 5), the surface is covered with concrete to be filled in later, and no joints are created, so there is no need to apply sealant or other materials that would be required for joints in the wall surface on the outdoor side. In addition, since there is no need to waterproof the wall surface on the indoor side (first wall surface 121 in Figure 5), it is sufficient to expose the vertical wall surface 41 of the precast section 4.

In addition, in the method for constructing the wall structure of this embodiment, the structural slit member 2 is placed, the end of the intermediate support member 61 inserted from the column structure 11 side is connected to the insert 6, and then concrete is continuously filled up to the height of the wall structure 12.

In this way, by using a structural slit member 2 in which a highly rigid precast section 4 is supported by an intermediate support member 61, the height of the wall structure 12 can be constructed in a single concrete pour, reducing the burden of construction management during concrete pouring.

Furthermore, if the wall unit 20 is manufactured by using the structural slit member 2 to arrange the reinforcement of the wall structure 12 on the ground, workability is improved compared to working in a narrow space with formwork close together, and the wall structure 12 can be constructed more efficiently.

The embodiment of the present invention has been described in detail above with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes that do not deviate from the gist of the present invention are included in the present invention.

For example, the materials and shapes of the structural slit 3 and frame material 32 described in the above embodiment are merely examples and are not limited thereto, and the present invention can be applied to structural slits of various shapes.

1, 1A: Buildings (structures)
11: Column body 12: Wall body 12a: Side edge 121: First wall surface 122: Second wall surface 123: Wall reinforcement 2: Structural slit member 20: Wall unit 3: Structural slit 31: Through hole 4: Precast part 41: Vertical wall surface 51: Wall horizontal reinforcement 6: Insert 61: Intermediate support material 72: Wall formwork (formwork)

Claims (6)

A structural slit member for arranging a structural slit along a side edge of a wall body of a structure,
A band-shaped structural slit arranged on a side edge of the wall body;
A precast portion formed in a long shape from concrete on the inside side of the wall body along the structural slit;
A wall cross bar having an end embedded in the precast portion and protruding toward the center of the wall structure;
A structural slit member characterized by being equipped with an insert embedded in the precast portion so as to communicate with the through hole of the structural slit. The structural slit member according to claim 1, characterized in that multiple inserts are embedded at intervals in the longitudinal direction of the precast section. The structural slit member according to claim 1 or 2, characterized in that the precast section has a vertical wall surface that is part of the first wall surface of the wall structure, and no wall surface is exposed at the position where the second wall surface of the wall structure facing the first wall surface is formed. The structural slit member according to claim 3, characterized in that a part of a separator connected to a wall formwork forming the second wall surface is embedded in the precast section. A method for constructing a wall structure adjacent to a column structure using the structural slit member according to claim 1 or 2,
A step of arranging the structural slit member at a position that is a boundary with the column body;
A step of connecting an end of an intermediate support material inserted from the column body side to the insert;
and continuously filling the inside of the formwork of the wall structure in which the precast sections are placed and reinforcement is applied with concrete up to the height of the wall structure. A method for constructing a wall structure adjacent to a column structure using the structural slit member according to claim 1 or 2,
a step of producing a wall unit by arranging reinforcement of the wall frame to the structural slit member;
A step of lifting the wall unit and arranging the structural slit member at the boundary with the column body;
A step of connecting an end of an intermediate support material inserted from the column body side to the insert;
A method for constructing a wall structure, comprising a step of continuously filling the wall units arranged inside the formwork of the wall structure with concrete up to the height of the wall structure.