JP2014114664A - Precast block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a precast block capable of enhancing workability of a structure for drawing out at least ones of pipelines and electric wirings.SOLUTION: In a building structure in which at least ones of pipelines 2a and electric wirings 2b are drawn out from a space between a reinforced-concrete or steel frame reinforced-concrete column 3 and a lightweight cellular concrete wall panel 4, an inventive precast block 1 is formed of lightweight cellular concrete and is arranged in the space, and is provided with insertion holes 24 communicating an indoor and an outdoor with each other for making at least ones of the pipelines 2a and the electric wirings 2b pass therethrough. The precast block 1 dispenses with reinforcement work for constructing a non-bearing wall, form work, and concrete placing work, and workability of the building structure can be enhanced.

Description

  The present invention relates to a precast block used for a structure of a building having columns made of reinforced concrete or steel reinforced concrete and wall panels made of lightweight cellular concrete.

  In a building such as an apartment house, pipes such as water supply pipes and gas pipes and electrical wiring may be drawn from between a column and a wall panel. For this reason, the non-bearing wall which has the insertion hole for allowing piping and wiring to penetrate is provided between the pillar and the wall panel. When the non-bearing wall is sufficiently small, the non-bearing wall is integrated with the column. When constructing a non-bearing wall that is integrated with a column, install a formwork for forming the non-bearing wall on the column, and install a cylindrical shape to form an insertion hole inside the formwork . Concrete is placed on the formwork to form a non-bearing wall.

  On the other hand, in order to improve the seismic performance of the building, there is a case where an earthquake-resistant slit mainly made of a foam is provided between the non-bearing wall and the column without integrating the non-bearing wall and the column. A structure in which the non-bearing wall and the column are structurally separated by arranging the earthquake-resistant slit is called a complete slit-type structure (see, for example, Non-Patent Document 1).

“2007 edition of structural technical standards for buildings”, National Gazette Sales Cooperative, August 2007, Appendix 1-3.2, p. 51.

  When a non-bearing wall is formed by placing concrete using a formwork, the shape of the non-bearing wall is small, so it takes time to construct the reinforcing bar, formwork, and concrete placing work. In comparison, there was a problem that workability deteriorated. Moreover, in order to form a through-hole in a non-bearing wall, the construction work which arrange | positions a cylindrical shape material to a formwork in a formwork requires further, and there existed a problem which workability worsened further.

  Then, an object of this invention is to provide the precast block which can improve the workability of the structure for drawing out at least one of piping and wiring.

  The precast block according to the present invention is a lightweight cellular concrete in a building structure in which at least one of piping and wiring is drawn out from a space formed between a column made of reinforced concrete or steel reinforced concrete and a wall panel made of lightweight cellular concrete. And an insertion hole that is disposed in the space and communicates between the room and the outside in order to allow insertion of at least one of the pipe and the wiring.

  The above-mentioned precast block can be easily placed between the pillar and the wall panel, so rebar construction, formwork and concrete placement work for constructing non-bearing walls are not required, and piping and wiring The workability of the structure for pulling out at least one can be improved. Moreover, since the through-hole is provided in the precast block, the operation | work which arrange | positions a cylindrical shape material to a formwork becomes unnecessary, and workability can further be improved. Therefore, it is possible to reduce the labor cost required for the construction of the structure for drawing out at least one of the piping and the wiring. In addition, the above-described precast block can be easily disposed so that a gap (slit) is formed between the pillars even when a complete slit structure is applied to ensure earthquake resistance. . Therefore, the structure for drawing out at least one of the piping and the wiring can be simplified.

  The precast block has a net-like reinforcing member embedded so as to be sandwiched between an inner part and an outer part made of lightweight cellular concrete, and the insertion hole penetrates the reinforcing member. According to such a configuration, the periphery of the insertion hole can be reinforced, cracking of the lightweight cellular concrete can be suppressed, and the insertion hole can be easily formed by punching the lightweight cellular concrete.

  Moreover, the precast block is further provided with an attachment hole that communicates the room with the outside in order to allow the rod for attachment to the column to pass therethrough. Thus, the precast block is attached to the pillar using the rod inserted through the attachment hole. Therefore, the attachment and removal structure of the precast block to the pillar using the rod body is enabled.

  ADVANTAGE OF THE INVENTION According to this invention, the precast block which can improve the workability of the structure for drawing out at least one of piping and wiring is provided.

1 is a perspective view showing a first embodiment of a structure to which a precast block according to the present invention is applied. FIG. 2 is a front view of the structure shown in FIG. 1. It is sectional drawing of the structure shown by FIG. (A) is a perspective view which shows the precast block which concerns on this invention, (b) is the perspective view which notched some precast blocks which concern on this invention. It is a perspective view which shows the state before attaching the precast block which concerns on this invention to a pillar. It is a perspective view which shows the state after attaching the precast block which concerns on this invention to the pillar. It is a perspective view which shows the state which attached the wall panel next to the precast block which concerns on this invention. It is sectional drawing which shows 2nd Embodiment of the structure to which the precast block which concerns on this invention is applied. It is sectional drawing which shows 3rd Embodiment of the structure to which the precast block which concerns on this invention is applied. It is sectional drawing which shows 4th Embodiment of the structure to which the precast block which concerns on this invention is applied. It is sectional drawing which shows 5th Embodiment of the structure to which the precast block which concerns on this invention is applied.

  Hereinafter, a preferred embodiment of a precast block according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  In a building such as an apartment house, piping for supplying water and gas and wiring for supplying electricity are installed for each dwelling unit. The piping is routed around the water in the bathroom, washbasin, kitchen, etc., and the wiring is routed to the outlet in each room. These pipes and wires pass through the floor, ceiling, or between the structural wall and the interior wall, which are not visible to the human eye, and are drawn out of the room and connected to a meter box or the like installed outside the room.

[First Embodiment]
1 to 3 show a non-bearing wall structure 100 where these wiring and piping are drawn from the indoor side to the outdoor side. As shown in FIG. 1, the pipe 2 a and the wiring 2 b are routed to the vicinity of the columns 3 made of reinforced concrete or steel reinforced concrete through the back of the wall or under the floor, and the small edge surface 4 a of the wall panel 4 and the It passes between the side surface 3a of the column 3 facing the fore end surface 4a and is drawn from the indoor side to the outdoor side. The non-bearing wall structure 100 includes a precast block 1 disposed between the pillar 3 and the wall panel 4, and a block attachment structure 10 (see FIG. 3) for attaching the precast block 1 to the pillar 3. .

  The small edge surface 4a of the wall panel 4 made of lightweight cellular concrete is separated from the side surface 3a of the pillar 3 by about 100 mm to 200 mm, and the upper surface 4b and the lower surface 4c of the wall panel 4 are fixed to a ruler angle (not shown) with hardware or the like. Has been.

  The precast block 1 according to the present embodiment is formed of lightweight cellular concrete from the viewpoint of workability and continuity of characteristics with the adjacent wall panel 4, and has a substantially rectangular parallelepiped shape extending in one direction. In the space formed between the pillar 3 and the wall panel 4, the two precast blocks 1 are stacked one above the other with the longitudinal direction of the precast block 1 as the vertical direction, and are arranged so as to fill the space. In addition, the number of the precast blocks 1 arrange | positioned between the pillar 3 and the wall panel 4 is not limited to two.

  As shown in FIG. 2, the precast block 1 has a size that can be arranged in a space formed between the pillar 3 and the wall panel 4. The width H2 of the precast block 1 is shorter than the distance H1 between the pillar 3 and the wall panel 4. The thickness T1 of the precast block 1 is substantially the same as that of the wall panel 4 (see FIG. 3).

  The length L1 in the longitudinal direction of the precast block 1 is shorter than the length L2 in the height direction of the wall panel 4, and when the two precast blocks 1 are stacked in the vertical direction, the height L2 of the wall panel 4 is It is almost the same. That is, the length L1 of the precast block 1 is about half the height L2 of the wall panel 4. Thus, since the length L1 in the longitudinal direction of the precast block 1 is shorter than the height L2, the internal stress generated by the handling load or wind load during the construction is greater than the allowable stress of the precast block 1. By reducing the size, damage to the precast block 1 can be suppressed.

  When the precast block 1 is arranged between the pillar 3 and the wall panel 4, slits 6a to 6d in which the precast block 1 is structurally separated from the pillar 3 or the wall panel 4 in order to improve the earthquake resistance of the building. It is formed. A slit 6 a is formed between the side surface 1 a of the precast block 1 facing the column 3 and the side surface 3 a of the column 3, and the side surface 1 b of the precast block 1 facing the small edge surface 4 a of the wall panel 4 and the small edge of the wall panel 4. A slit 6b is formed between the surface 4a. A slit 6 c is formed between the floor-side precast block 1 and the ceiling-side precast block 1, and a slit 6 d is formed between the floor-side precast block 1 and the base portion 5. In these slits 6a to 6d, a sealing material 7 for ensuring waterproofness and a fireproof joint material 8 for ensuring fire resistance are arranged (see FIG. 3).

  As shown in FIG. 3, the precast block 1 includes a mounting bracket 9 embedded in the pillar 3, a mounting bracket 11 fixed to the mounting bracket 9, and a fastener for fixing the precast block 1 to the mounting bracket 11. 15 is attached to the pillar 3 by a block mounting structure 10 including

  At both ends of the precast block 1, there are provided mounting holes 12 through which rods for attaching the precast block 1 to the pillars 3 are inserted (see FIG. 4A). Here, the rod body is a bolt 13. Further, a seat portion 14 having a concave shape concentric with the attachment hole 12 is provided on the outdoor surface 1 c of the precast block 1.

  The mounting hole 12 and the seat portion 14 are formed by removing the mounting hole 12 from the bottom surface of the seat portion 14 after the seat portion 14 is processed. These processes may be performed at the factory before the precast block 1 is carried into the building construction site, or may be performed at the construction site.

  The mounting bracket 9 embedded in the pillar 3 includes an angle having an L-shaped cross section, and is disposed at a corner 3b on the indoor side of the side surface 3a of the pillar 3, and includes one piece 9a and another piece 9b along the side face 3a of the pillar 3. The surface is exposed from the pillar 3. The mounting bracket 9 has a leg piece 9c fixed to the back surface of the piece 9a. The leg piece 9c is embedded in the column 3.

  The mounting bracket 11 fixed to the mounting bracket 9 has an L-shaped cross section, and includes a first piece 11a fixed to one piece 9a of the mounting bracket 9 and a first piece 11a extending vertically from the first piece 11a. 2 pieces 11b. The surface 1d of the precast block 1 is in contact with the outdoor surface of the piece 11b. Further, a bolt hole 16 into which a bolt 13 for attaching the precast block 1 to the mounting bracket 11 is inserted is formed in the piece 11b.

  Here, the length L3 from the side surface 3a of the pillar 3 to the center of the bolt hole 16 is longer than the length L4 from the side surface 1a of the precast block 1 to the center of the mounting hole 12. By setting in this way, the center of the bolt hole 16 and the center of the mounting hole 12 are made to coincide with each other, and a slit is formed between the side surface 3a of the pillar 3 and the side surface 3a of the precast block 1 simply by passing the bolt 13 therethrough. 6a is formed.

  Moreover, since the precast block 1 is attached to the column 3 via the fittings 9 and 11 by the fastener 15 including the bolt 13 and the nut 17, it can be easily attached. Furthermore, the precast block 1 can be easily removed from the pillar 3 by removing the nut 17 from the bolt 13. According to such a structure, the maintainability of a building can be improved. Further, another precast in which the number and shape of the insertion holes 24 (see FIG. 4A) for drawing out the pipe 2a and the wiring 2b are changed in response to the change of the pipe 2a and the wiring 2b due to the change of the indoor equipment. It can be easily exchanged for a block.

  As shown in FIGS. 4 (a) and 4 (b), the precast block 1 is embedded in the vicinity of the first reinforcing member 18 embedded in the vicinity of the outdoor surface 1c and in the vicinity of the indoor surface 1d. A second reinforcing member 19.

  Here, in the precast block 1, an outdoor side outer portion 21 and an indoor side inner portion 22 are set, and an intermediate portion 23 is set between the outer side portion 21 and the inner side portion 22. The reinforcing members 18 and 19 are arranged so as to sandwich an intermediate portion 23 made of lightweight cellular concrete, and are embedded so as to be sandwiched between an outer portion 21 and an inner portion 22 made of lightweight cellular concrete. The shape of the reinforcing members 18 and 19 in plan view is substantially the same as the shape of the precast block 1 in plan view.

  The reinforcing members 18 and 19 are planar mesh members made of a wire material or a thin steel plate material, and for example, a lath mesh can be used. The material of the reinforcing members 18 and 19 and the dimensions of the wire material or the thin steel plate material constituting the mesh member are determined according to the workability of the lightweight cellular concrete punching process for forming the insertion hole 24 and the mounting hole 12 described later, and the insertion hole 24. And it is determined in consideration of the reinforcing effect around the mounting hole 12. The mesh size of the reinforcing members 18 and 19 is determined in consideration of the adhesion of the reinforcing members 18 and 19 to the lightweight cellular concrete and the positions of the insertion holes 24 and the mounting holes 12.

  The precast block 1 is provided with a plurality of insertion holes 24 that allow communication between the interior and the exterior of the pipe 2a and the wiring 2b. The plurality of insertion holes 24 are provided along the longitudinal direction of the precast block 1. In the precast block 1 of the present embodiment, five insertion holes 24 are provided at intervals of 125 mm. The number of insertion holes 24 is not limited to five. Further, the interval between the insertion holes 24 is not limited to 125 mm. These insertion holes 24 having a circular cross section have an inner diameter of 30 mm to 80 mm. Since the insertion hole 24 through which the pipe 2 a and the wiring 2 b are inserted has an inner diameter larger than the mesh of the reinforcing members 18 and 19, the reinforcing members 18 and 19 have through holes at positions corresponding to the respective insertion holes 24. It is formed (see FIG. 4B).

  As described above, the first and second reinforcing members 18 and 19 are embedded in the precast block 1, and the insertion hole 24 is formed so as to penetrate the reinforcing members 18 and 19. Therefore, since the periphery of the insertion hole 24 is reinforced by the reinforcing members 18 and 19 and cracks are suppressed, the insertion hole 24 can be formed close to the side surface 3a. For this reason, as shown in FIG. 2, the center positions 24 c of the plurality of insertion holes 24 are set closer to the column 3 side than the center line C <b> 1 of the width H <b> 2 of the precast block 1. The position where the center position 24c of the insertion hole 24 is set is not limited to the position closer to the column 3 side than the center line C1 of the width H2 of the precast block 1.

  More specifically, it is preferable that the position of the insertion hole 24 is set so that the wall thickness between the inner surface of the insertion hole 24 and the side surface 3a of the precast block 1 is secured to a predetermined thickness or more. Accordingly, as the hole diameter of the insertion hole 24 increases, the center position 24c of the insertion hole 24 is set to the width center line C1 side. On the other hand, as the hole diameter of the insertion hole 24 becomes smaller, the center position 24 c of the insertion hole 24 is set closer to the side surface 3 a of the precast block 1. By setting the position of the insertion hole 24 in this way, the piping 2a and the wiring 2b can be arranged closer to the column 3 side, and the space for hiding the piping 2a and the wiring 2b on the indoor side can be reduced.

  By the way, when placing a plurality of cylindrical shapes in a formwork in advance and placing concrete, it is difficult to uniformly place the concrete between the tubular shapes and the like. May occur. Since the insertion hole 24 of the present embodiment is formed by a punching process performed at a factory before the precast block 1 is carried into a building construction site, it is possible to suppress the occurrence of construction defects in concrete placement. it can.

  In addition, when punching is performed at a construction site, since a processing error becomes large, a larger hole diameter is set in consideration of a dimension margin. However, when punching is performed at a factory, high-precision processing is performed. Since it can be performed, the hole diameter can be set small, and a decrease in strength of the precast block 1 can be suppressed. Thus, precasting of the precast block 1 means cutting in advance into a predetermined external dimension at the factory and punching for the insertion hole 24.

  Next, a procedure for constructing the non-bearing wall structure 100 for drawing out the pipe 2a and the wiring 2b using the precast block 1 will be described. First, a form for the pillar 3 is formed. After the mounting bracket 9 (see FIG. 5) is placed in advance inside the mold, concrete is placed. Subsequently, the mounting bracket 11 is fixed to the mounting bracket 9 by welding.

  Subsequently, as shown in FIG. 5, the precast block 1 is arranged adjacent to the pillar 3 so that the center of the bolt hole 16 of the mounting bracket 11 and the center of the mounting hole 12 of the precast block 1 substantially coincide with each other. In this way, by aligning the center of the bolt hole 16 of the mounting bracket 11 with the center of the mounting hole 12 of the precast block 1 and passing the bolt 13 described later, the side surface 3a of the pillar 3 and the side surface 3a of the precast block 1 are passed. A slit 6a (see FIG. 2) is automatically formed between the two. Therefore, the slit 6a for making a complete slit structure can be easily formed.

  Next, the bolt 13 is inserted from the outdoor side in the order of the washer 26, the mounting hole 12 of the precast block 1 and the bolt hole 16 of the mounting bracket 11, and the screw portion of the bolt 13 protrudes to the indoor side. The nut 17 is screwed and fixed.

  The bolting operation described above is performed for each mounting hole 12 provided at the upper and lower ends of the precast block 1. Next, the ceiling-side precast block 1 is disposed adjacent to the pillar 3. In this case, the same procedure as that for fixing the floor-side precast block 1 is performed. By the above operation, the precast block 1 is attached to the pillar 3 via the attachment fittings 9 and 11 as shown in FIG.

  Next, as shown in FIG. 7, the wall panel 4 is disposed adjacent to the precast block 1. Then, connecting fittings (not shown) provided on the upper surface 4b and the lower surface 4c of the wall panel 4 are fixed to a ruler angle (not shown) provided on the base 5 on the floor side and the beam (not shown) on the ceiling side. By doing so, the wall panel 4 is arranged. And the sealing material 7 and the fireproof joint material 8 are arrange | positioned in the slit 6a between the pillar 3 and the precast block 1, and the slit 6b between the precast block 1 and a wall panel (refer FIG. 3).

  Subsequently, the wiring 2 b and the pipe 2 a are inserted through the insertion hole 24. A fireproof section penetrating treatment material such as a sealing material or a fireproof joint material is also disposed between the pipe 2a and the inner wall surface of the insertion hole 24 or between the wiring 2b and the inner wall surface of the insertion hole 24 as necessary. Further, in order to ensure the rust prevention and waterproofness of the bolt 13 and the washer 26, a repair material is filled and embedded in the seat portion 14 which is a recess (see FIG. 1). Through the above steps, as shown in FIG. 1, the non-bearing wall structure 100 for drawing out the pipe 2 a and the wiring 2 b is constructed between the pillar 3 and the wall panel 4.

  According to the precast block 1 described above, it is not necessary to provide a non-bearing wall integrated with the pillar 3 in the non-bearing wall structure 100 of the building. Therefore, the reinforcing work, formwork and concrete placing work for constructing the non-bearing wall are not required, and the workability of the non-bearing wall structure 100 can be improved. Moreover, since the insertion hole 24 is provided in the precast block 1, the operation | work which arrange | positions a cylindrical shape material in the formwork for concrete placement becomes unnecessary, and also improves the workability of the non-bearing wall structure 100. be able to.

  In addition, since the precast block 1 described above can be easily arranged so that the slit 6a is formed between the precast block 1 and the pillar 3, it is between the pillar 3 and the precast block 1 as in the prior art. It is not necessary to arrange earthquake-resistant slits or the like in order to make a complete slit type structure. Therefore, the non-bearing wall structure 100 for drawing out at least one of the pipe 2a and the wiring 2b can be simplified.

  Further, the precast block 1 has net-like reinforcing members 18 and 19 embedded so as to be sandwiched between an outer portion 21 and an inner portion 22 made of lightweight cellular concrete. The plurality of insertion holes 24 penetrate the reinforcing members 18 and 19. According to such a configuration, the periphery of the insertion hole 24 can be reinforced, cracking of the lightweight cellular concrete can be suppressed, and the insertion hole 24 can be easily formed by punching the lightweight cellular concrete.

  In addition, the precast block 1 is further provided with a mounting hole 12 that allows the interior and the exterior to communicate with each other so that a bolt 13 for mounting the precast block 1 can be inserted into the column 3. Thus, the precast block 1 is attached to the pillar 3 using the bolt 13 inserted through the attachment hole 12. Therefore, the attachment and removal structure of the precast block 1 to the pillar 3 using the bolt 13 is enabled.

[Second Embodiment]
As shown in FIG. 8, the second embodiment is different from the first embodiment in that the non-bearing wall structure 101 has a block mounting structure 10 </ b> B using an L-shaped rod body 27. To do. The rod body 27 includes a male screw portion 27a formed on one end side, and a bent portion 27b bent so as to be orthogonal to the male screw portion 27a. According to this rod 27, the male screw portion 27a is inserted from the indoor side into the bolt hole 16 of the mounting bracket 11, the mounting hole 12 of the precast block 1, and the washer 26, and a part of the male screw portion 27a is moved to the outdoor side. Make it protrude. When the nut 17 is screwed onto the male screw portion 27a, the bent portion 27b comes into contact with the one piece 11b of the mounting bracket 11, so that the movement of the rod body 27 is restricted. Therefore, since the precast block 1 and the mounting bracket 11 are clamped by the bent portion 27b of the rod 27 and the nut 17, the precast block 1 can be attached to the column 3.

[Third Embodiment]
As shown in FIG. 9, in the third embodiment, the non-bearing wall structure 102 is mounted on the side surface 3a of the pillar 3 between the corner 3b on the indoor side and the corner 3c on the outdoor side. This is different from the first embodiment. The block mounting structure 10 </ b> C includes a mounting bracket 28 embedded in the pillar 3. The mounting bracket 28 includes a flat plate material, is disposed between the indoor corner 3 b and the outdoor corner 3 c of the side surface 3 a of the column 3, and the surface 28 a is exposed from the column 3. The mounting bracket 11 is fixed to the surface 28a by welding. Further, the mounting bracket 28 has a leg piece 28c fixed to the back surface 28b. The leg piece 28c is embedded in the column 3 and extends obliquely with respect to the side surface 3a from the side surface 3a toward the outdoor side surface 3d.

[Fourth Embodiment]
As shown in FIG. 10, the fourth embodiment is different from the first embodiment in that the non-bearing wall structure 103 is attached to the corner 3 c on the outdoor side on the side surface 3 a of the column 3. To do. The block mounting structure 10 </ b> D includes a mounting bracket 29 embedded in the pillar 3. The mounting bracket 29 includes a flat plate material, is disposed in the vicinity of the corner 3 c on the outdoor side of the column 3, and the surface 29 a is exposed from the column 3. The mounting bracket 11 is fixed to the surface 29a by welding. The mounting bracket 29 has a leg piece 29c fixed to the back surface 29b. The leg piece 29c is embedded in the column 3 and is inclined with respect to the side surface 3a from the side surface 3a toward the indoor side surface 3e. Extending in the direction.

[Fifth Embodiment]
As shown in FIG. 11, in the fifth embodiment, the non-bearing wall structure 104 has a block mounting structure 10 </ b> E including a post-installed anchor 31 and a mounting bracket 32 attached to the column 3 by the post-constructed anchor 31. This is different from the first embodiment. The post-construction anchor 31 is disposed in the vicinity of the corner 3 b on the indoor side of the column 3, and has a buried portion embedded in the column 3 and a screw portion protruding from the side surface 3 a of the column 3. A nut 33 is screwed onto the screw portion with the mounting bracket 32 interposed therebetween. The mounting bracket 32 has an L-shaped angle, and includes a first piece 32a that contacts the side surface 3a of the column 3 and a second piece 32b that extends vertically from the first piece 32a. Yes. The first piece 32 a is formed with a bolt hole 34 through which the post-construction anchor 31 for attaching the mounting bracket 32 to the column 3 is inserted.

  The present invention is not limited to the embodiment described above. The non-bearing wall structure 101 of the second embodiment using the L-shaped rod body 27 may be attached between the indoor corner portion 3b and the outdoor corner portion 3c of the column 3. Further, the non-bearing wall structure 101 may be attached to the corner 3 c on the outdoor side of the column 3.

  Further, the non-bearing wall structure 104 of the fifth embodiment using the post-construction anchor 31 may be attached between the indoor corner portion 3b and the outdoor corner portion 3c of the column 3. Further, the non-bearing wall structure 101 may be attached to the corner 3 c on the outdoor side of the column 3.

DESCRIPTION OF SYMBOLS 1 ... Precast block, 2a ... Piping, 2b ... Wiring, 3 ... Column, 4 ... Wall panel, 6a-6d ... Slit, 12 ... Mounting hole, 13 ... Bolt (rod), 18, 19 ... Reinforcement member, 21 ... Inner part, 22 ... outer part, 24 ... insertion hole, 27 ... bar, 100-104 ... non-bearing wall structure.

Claims (3)

In the structure of a building in which at least one of piping and wiring is drawn out from a space formed between a column made of reinforced concrete or steel reinforced concrete and a wall panel made of lightweight cellular concrete,
A precast block which is formed of lightweight cellular concrete and is provided in the space, and is provided with an insertion hole for communicating at least one of the pipe and the wiring with the interior and the exterior. . Having a net-like reinforcing member embedded so as to be sandwiched between an inner part and an outer part made of the lightweight cellular concrete,
The precast block according to claim 1, wherein the insertion hole penetrates the reinforcing member.   The precast block according to claim 1 or 2, further comprising a mounting hole for communicating the room and the outdoor space so that a rod for mounting on the pillar is inserted.

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