Composite slab

Abstract

To provide a composite slab capable of improving strength and stiffness by improving the shear force transmission performance between the reinforced concrete slab and the wooden surface material.SOLUTION: A composite slab 101 includes: a wooden surface material 30 having an upper surface 31 and a lower surface 32 opposed to each other in the thickness direction; a reinforced concrete slab 50 that is laminated on the upper surface 31 of the wooden surface material 30; a first shape steel 71 and a second shape steel 72 that extend in the first direction Y, intersecting the main bar 61 of the reinforced concrete slab 50, and are spaced apart in a second direction X that intersects the first direction Y and fixed to the top surface 31; and a block 81 that fits into a gap between the first shape steel 71 and the second shape steel 72.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a composite slab. [Background Art]

[0002] Conventionally, composite slabs combining reinforced concrete and wood have been known (see, for example, Patent Document 1). The composite slab described in Patent Document 1 includes a wood slab having a recess formed on the upper surface thereof, and a reinforced concrete slab provided on the upper surface of the wood slab. In the wood slab of this composite slab, end faces of a plurality of plate materials are butted against each other, and the recess is formed so as to straddle a portion where the end faces are butted against each other. [Prior Art Documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2019-39171 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] However, in the composite slab according to the prior art, the recess is formed only in a portion where end faces of a plurality of plate materials are butted against each other, so that transmission of shear force is not sufficient.

[0005] An object of the present invention is to provide a composite slab capable of improving the shear force transmission performance between a reinforced concrete slab and a wood face material, and improving the yield strength and rigidity. [Means for Solving the Problem]

[0006] In order to achieve the above object, one aspect of the composite slab according to the present invention is: a wood face material having a first surface and a second surface opposed to each other in a plate thickness direction; a reinforced concrete slab laminated on the first surface of the wood face material; A first-shaped steel member and a second-shaped steel member extend in a first direction intersecting the main reinforcement of the reinforced concrete slab, are spaced apart in a second direction intersecting the first direction, and are fixed to the first surface, The system comprises a block body that fits into the gap between the first and second steel members.

[0007] In this embodiment, the first and second shaped steel members are fixed to the first surface of the wood panel, and the block body is fitted into the gap between the first and second shaped steel members, thereby allowing the block body to be supported by the first and second shaped steel members. Furthermore, in this embodiment, the block body, the first and second shaped steel members are embedded inside the reinforced concrete slab constructed on top of the wood panel. This allows the shear force between the reinforced concrete slab and the wood panel to be transmitted via the block body, the first and second shaped steel members. In addition, in this embodiment, the first and second shaped steel members extend in a direction intersecting the main reinforcement of the concrete slab, allowing the block body, the first and second shaped steel members to receive the shear force in the direction in which the main reinforcement extends. Furthermore, in this embodiment, the shear force transmission performance between the reinforced concrete slab and the wood panel can be improved, thereby improving the load-bearing capacity and rigidity of the composite slab.

[0008] In another embodiment of the present invention, The upper part of the block body protrudes above the first and second steel members.

[0009] According to this embodiment, the upper part of the block body, which extends above the first and second type steel members, can receive shear forces. This allows the shear force between the reinforced concrete slab and the wood panel to be transmitted via the block body, the first type steel member, and the second type steel member. Furthermore, according to this embodiment, the shear force transmission performance between the reinforced concrete slab and the wood panel can be improved, thereby improving the load-bearing capacity and rigidity of the composite slab.

[0010] In another embodiment of the present invention, The plurality of the block bodies are characterized by being arranged at predetermined intervals in the first direction.

[0011] According to this embodiment, shear force can be received by a plurality of block bodies arranged at predetermined intervals in the first direction. Furthermore, according to this embodiment, shear force can be transmitted between the reinforced concrete slab and the wood panel through the plurality of block bodies aligned in the first direction. Moreover, according to this embodiment, the shear force transmission performance between the reinforced concrete slab and the wood panel can be improved, thereby improving the load-bearing capacity and rigidity of the composite slab.

[0012] In another embodiment of the present invention, The plurality of the aforementioned block bodies are characterized by being arranged at the grid points of a rectangular grid in plan view.

[0013] According to this embodiment, the shear force between the reinforced concrete slab and the timber panel can be transmitted by multiple block bodies arranged at the grid points, thereby improving the shear force transmission performance and enhancing the load-bearing capacity and rigidity of the composite slab. Furthermore, by evenly distributing multiple block bodies on the first surface of the timber panel, localized concentration of shear force transmission between the reinforced concrete slab and the timber panel is prevented. In addition, stress in the composite slab can be distributed, further enhancing the load-bearing capacity and rigidity.

[0014] In another embodiment of the present invention, The block body is characterized by being continuous in the longitudinal direction of the first and second steel members.

[0015] According to this embodiment, the shear force between the reinforced concrete slab and the wood face material can be transmitted via the block body continuous in the direction intersecting the main reinforcement, whereby the shear force transmission performance can be improved, and the yield strength and rigidity of the composite slab can be enhanced. Further, since the shear force can be transmitted via the block body continuous in the longitudinal direction, the shear force transmission performance can be improved compared with the case where the shear force is transmitted via a plurality of block bodies with short lengths. Therefore, the number of installed block bodies can be reduced.

[0016] Further, in another aspect of the present invention, The block body is characterized in that the material thereof is any one of wood, mortar and concrete.

[0017] According to this embodiment, the shear force between the reinforced concrete slab and the wood face material can be transmitted via the block body formed of wood, mortar or concrete. According to this embodiment, the shear force can be transmitted by the block body with ensured predetermined strength, whereby the shear force transmission performance can be improved, and the yield strength and rigidity of the composite slab can be enhanced. Effects of the Invention

[0018] As can be understood from the above description, according to the present invention, it is possible to provide a composite slab capable of improving the shear force transmission performance between a reinforced concrete slab and a wood face material, and improving the yield strength and rigidity. Brief Description of the Drawings

[0019] [Figure 1] FIG. 1 is a perspective view showing an example of the composite slab according to the first embodiment. [Figure 2] FIG. 2 is a cross-sectional view showing an example of the composite slab according to the first embodiment. [Figure 3] FIG. 3 is a plan view showing an example of the composite slab according to the first embodiment, which is a plan view showing the CLT panel before concrete is placed. [Figure 4]It is an enlarged cross-sectional view showing a pair of shaped steel members fixed to the upper surface of a CLT panel and a block disposed between the pair of shaped steel members. [Figure 5] It is a plan view showing an example of the composite slab according to the second embodiment, and is a plan view showing the CLT panel before concrete is placed. [Figure 6] It is an enlarged cross-sectional view showing a pair of shaped steel members fixed to the upper surface of the CLT panel of the composite slab according to the third embodiment, and a block disposed between the pair of shaped steel members. [Mode for Carrying Out the Invention]

[0020] Hereinafter, a composite slab according to an embodiment will be described with reference to the accompanying drawings. In the present specification and drawings, substantially identical components are denoted by the same reference numerals, and redundant description may be omitted.

[0021] [First Embodiment; Composite Slab] An example of the composite slab according to the first embodiment will be described with reference to FIGS. 1 to 4. Here, FIG. 1 is a perspective view showing an example of the composite slab according to the first embodiment. FIG. 2 is a cross-sectional view showing an example of the composite slab according to the first embodiment. FIG. 3 is a plan view showing an example of the composite slab according to the first embodiment. FIG. 4 is an enlarged cross-sectional view showing a pair of shaped steel members fixed to the upper surface of a CLT panel and a block disposed between the pair of shaped steel members. In addition, in each drawing, arrows indicating the mutually orthogonal X-axis direction, Y-axis direction, and Z-axis direction may be appropriately shown. The X-axis direction and the Y-axis direction are along the horizontal direction. The X-axis direction is along the longitudinal direction of the wooden surface material. The Y-axis direction is along the width direction of the wooden surface material. The Z-axis direction is along the vertical direction. The Z-axis direction is along the plate thickness direction of the wooden surface material.

[0022] The frame of a building having the composite slab 101 includes columns and beams 10. The column may be, for example, a steel structure (S structure) column. The column is not limited to a steel structure column, and may be a reinforced concrete structure (RC structure) column or a steel reinforced concrete structure (SRC structure) column. The column may also be a wooden column.

[0023] Beam 10 is, for example, a steel beam (steel frame beam). Beam 10 extends in the Y-axis direction. Both ends of beam 10 are connected to a pair of columns.

[0024] As shown in Figures 1 and 2, the beam 10 is made of, for example, an H-shaped steel and has a web 11, an upper flange 12, and a lower flange 13. The beam 10 is not limited to a steel beam, but may also be a reinforced concrete (SRC) or steel-reinforced concrete (RC) beam. The beam 10 may also be a wooden beam, or a composite wooden beam having multiple beams.

[0025] The composite slab 101 comprises a CLT panel 30 and a reinforced concrete slab 50. Note that "reinforced concrete slab" may be abbreviated as "RC slab".

[0026] The CLT panel 30 is positioned beneath the RC slab 50. The CLT panel 30 is formed by laminating multiple layers, and the sawn lumber in these layers is arranged so that the grain direction is perpendicular to that of the sawn lumber in adjacent layers. The multiple layers are bonded to each other. The CLT panel 30 is an example of a wood-based paneling material. The wood-based paneling material is not limited to the CLT panel 30, but may also be other wood-based paneling materials such as LVL (Laminated Veneer Lumber). The CLT panel 30 consists of, for example, 5 layers. The CLT panel 30 may also consist of, for example, 3 layers, 4 layers, 7 layers, or 9 layers. The number of layers in the CLT panel 30 is based, for example, on the provisions of JAS (Japanese Agricultural Standards). The wood-based paneling material may also be based on other laws and standards.

[0027] The CLT panel 30 has an upper surface (first surface) 31 and a lower surface (second surface) 32 facing each other in the thickness direction. The RC slab 50 is formed on the upper surface 31 of the CLT panel 30. The RC slab 50 is joined to the upper surface 31 of the CLT panel 30.

[0028] The RC slab 50 has concrete 51 poured onto the upper surface 31 of the CLT panel 30, and reinforcing bars 61 and 62 embedded in the concrete 51. The concrete 51 is, for example, ordinary concrete. The RC slab 50 also includes the portion above the upper flange 12 of the beam 10.

[0029] Reinforcement bars 61 are spaced apart in the Y-axis direction and extend in the X-axis direction. Reinforcement bars 62 are spaced apart in the X-axis direction and extend in the Y-axis direction. Reinforcement bars 61 and 62 are, for example, deformed reinforcement bars and are arranged in directions that intersect each other. Reinforcement bar 61 is the main reinforcement, and reinforcement bar 62 is the distribution reinforcement. Note that reinforcement bars 61 and 62 are not limited to deformed reinforcement bars, but may be other types of reinforcement bars. Also, the reinforcement of the RC slab 50 may include reinforcement bars other than the main reinforcement and distribution reinforcement bars.

[0030] The CLT panel 30 is supported by multiple beams 10. The end 30a of the CLT panel 30 rests on the upper surface 12a of the upper flange 12.

[0031] As shown in Figure 2, the beam 10 is provided with a plurality of studs 8 that protrude upward from the upper flange 12. The plurality of studs 8 are arranged at predetermined intervals along the longitudinal direction of the beam 10. The studs 8 are welded to the upper flange 12, for example.

[0032] Multiple studs 9 are provided on the end face 30b of the CLT panel 30. The end face 30b is the end face of the CLT panel 30 in the X-axis direction. The end face 30b is a surface that aligns with the YZ plane. The multiple studs 9 project from the end face 30b in the X-axis direction onto the upper flange 12. The multiple studs 9 are arranged at predetermined intervals along the longitudinal direction of the beam 10. The base ends of the studs 9 are embedded in the end face 30b.

[0033] Concrete 51 is poured onto the upper flange 12, integrating the beam 10 with the composite slabs 101 positioned on both sides of the beam 10 in the X-axis direction. Multiple studs 8 and 9 are embedded in the concrete 51.

[0034] Next, with reference to Figures 1 to 4, a pair of shaped steel members 71 and 72 fixed to the CLT panel 30, and a block 81 positioned between the pair of shaped steel members will be described. Multiple pairs of shaped steel members 71 and 72 are fixed to the upper surface 31 of the CLT panel 30. Shaped steel member 71 is an example of a first shaped steel member, and shaped steel member 72 is an example of a second shaped steel member.

[0035] The structural steel members 71 and 72 extend in the Y-axis direction and are arranged at predetermined intervals in the X-axis direction. The Y-axis direction is an example of a first direction and is the direction that intersects with the main reinforcement bars 61. The X-axis direction is an example of a second direction and is the direction that runs along the reinforcement bars 61.

[0036] The structural steel members 71 and 72 are, for example, angle steel. As shown in Figure 4, the structural steel member 71 has a first piece 73 fixed to the upper surface 31 of the CLT panel 30 and a second piece 74 projecting upward from the first piece 73. The thickness direction of the first piece 73 is along the Z-axis direction. The thickness direction of the second piece 74 is along the X-axis direction.

[0037] The structural steel member 72 has a first piece 75 fixed to the upper surface 31 of the CLT panel 30 and a second piece 76 projecting upward from the first piece 75. The thickness direction of the first piece 75 is along the Z-axis direction. The thickness direction of the second piece 76 is along the X-axis direction. In the pair of structural steel members 71 and 72, the second pieces 74 and 76 extend in opposite directions from each other.

[0038] The first pieces 73 and 75 are fixed to the upper surface 31 of the CLT panel 30 by a plurality of bolts. Bolt holes are formed in the first pieces 73 and 75 through which the bolts are inserted. The bolts extend in the Z-axis direction and are driven into the CLT panel 30. The plurality of bolts are arranged at predetermined intervals in the Y-axis direction. The bolts are, for example, lag screw bolts or coach screw bolts. Alternatively, the structural steel members 71 and 72 may be fixed to the CLT panel 30 using nails or other rod-shaped fixing members instead of bolts.

[0039] The height of the second pieces 74 and 76 along the Z-axis direction may be, for example, 20% or more and 50% or less of the thickness of the concrete 51 on the CLT panel 30. The second pieces 74 and 76 have openings that penetrate in the direction of the plate thickness. This allows the concrete 51 to flow through the openings when it is poured.

[0040] As shown in Figure 3, the pair of structural steel members 71 and 72 are arranged along substantially the entire length of the CLT panel 30 in the Y-axis direction. Multiple structural steel members 71 and 72 may be arranged along the longitudinal direction of the structural steel members 71 and 72. The pair of structural steel members 71 and 72 may be arranged continuously along the entire length of the CLT panel 30 in the Y-axis direction, or they may be arranged intermittently.

[0041] In the X-axis direction, multiple blocks 81 are placed in the gap between a pair of shaped steel members 71 and 72. A block 81 is an example of a block body, for example, a rectangular parallelepiped. A block 81 is not limited to a rectangular parallelepiped; it may be a cube or have other shapes. The material of the block 81 may be wood, mortar, or concrete. The strength of the block 81 may be the same as that of the CLT panel 30, or it may be higher than that of the CLT panel 30.

[0042] Multiple blocks 81 are arranged at predetermined intervals in the Y-axis direction. The upper part of block 81 protrudes above the upper ends of the second pieces 74, 76 of the structural steel members 71, 72. As shown in Figure 4, block 81 has an upper surface 82 and a lower surface 83.

[0043] Block 81 has side walls 84 and 85 that face each other in the X-axis direction. Block 81 is sandwiched between a pair of structural steel members 71 and 72. Block 81 is supported by the pair of structural steel members 71 and 72 and fixed to the upper surface 31 of the CLT panel 30. Side wall 84 of block 81 abuts against the second piece 74 of the opposing structural steel member 71. Side wall 85 of block 81 abuts against the second piece 76 of the opposing structural steel member 72. Block 81 is sandwiched between the second pieces 74 and 76.

[0044] The overhang height H1 of block 81 is, for example, 30 mm. The overhang height H1 of block 81 is the height from the top surface 31 of the CLT panel 30 to the top surface 82 of block 81 in the Z-axis direction. The overhang height H1 of block 81 is higher than the height H2 of the second pieces 74 and 76 of the structural steel members 71 and 72. The height H2 is the height from the top surface 31 to the top end of the second pieces 74 and 76.

[0045] The overhang height H1 of block 81 may be, for example, 30% or more and 60% or less of the plate thickness T1 of the CLT panel 30. Plate thickness T1 is the thickness from the top surface 31 to the bottom surface 32. The overhang height H1 of block 81 may be, for example, 0.2 times or more and 1.5 times the width W1 of block 81. The overhang height H1 of block 81 may be any other value. The plate thickness T1 of the CLT panel 30 is, for example, 90 mm or more and 270 mm or less. The thickness T2 of the RC slab 50 is, for example, 60 mm or more and 360 mm or less.

[0046] Furthermore, the thickness T2 of the RC slab 50 may be the same as the thickness T1 of the CLT panel 30. The thickness T2 of the RC slab 50 may be 50% or more and 400% or less of the thickness T1 of the CLT panel 30.

[0047] For example, as shown in Figures 2 and 3, the width W1 of block 81 in the X-axis direction may be 5% or more and 50% or less of the spacing L1 between adjacent blocks 81 in the X-axis direction. As shown in Figure 3, the width W2 of block 81 in the Y-axis direction may be 5% or more and 50% or less of the spacing L2 between adjacent blocks 81 in the Y-axis direction. The widths W1 and W2 of block 81 may be the same or different. The spacing L1 and L2 between blocks 81 may be the same or different. Spacing L1 is the distance between the center positions of adjacent blocks 81 in the X-axis direction. Spacing L2 is the distance between the center positions of adjacent blocks 81 in the Y-axis direction.

[0048] In a plan view, the total area of ​​the upper surfaces 82 of the multiple blocks 81 may be 5% or more and 25% or less of the total area of ​​the CLT panel 30.

[0049] Concrete 51 is poured onto the upper surface 31 of the CLT panel 30, and the structural steel members 71, 72 and the block 81 are embedded in the concrete 51. The second pieces 74, 76 of the structural steel members 71, 72 and the side walls 84, 85 of the block 81 engage with the concrete 51, thereby transmitting shear force between the RC slab 50 and the CLT panel 30.

[0050] The block 81 can be fixed by pushing it from above into the gap between the pair of structural steel members 71 and 72 fixed to the CLT panel 30. The method of fixing the block 81 is not limited to this. For example, the second pieces 74 and 76 of the structural steel members 71 and 72 and the block 81 may be fixed together with screws. Alternatively, the pair of structural steel members 71 and 72 and the block 81 may be fixed to each other and then fixed to the upper surface 31 of the CLT panel 30.

[0051] (Effects of Synthetic Slab 101) According to the composite slab 101 of the first embodiment, a pair of shaped steel members 71 and 72 are fixed to the upper surface 31 of the CLT panel 30, and a plurality of blocks 81 are fitted into the gaps between the shaped steel members 71 and 72, thereby allowing the blocks 81 to be supported by the shaped steel members 71 and 72. Furthermore, according to this embodiment, the shaped steel members 71 and 72 and the blocks 81 are embedded inside the RC slab 50 constructed on top of the CLT panel 30. This allows the shear force between the RC slab 50 and the CLT panel 30 to be transmitted via the blocks 81 and the shaped steel members 71 and 72. In addition, according to this embodiment, the shaped steel members 71 and 72 extend in a direction intersecting the reinforcing bars 61, which are the main reinforcement of the RC slab 50, so that the shear force in the direction in which the reinforcing bars 61 extend can be received by the blocks 81 and the shaped steel members 71 and 72. Furthermore, according to this embodiment, the shear force transmission performance between the RC slab 50 and the CLT panel 30 can be improved, thereby increasing the load-bearing capacity and rigidity of the composite slab 101.

[0052] Furthermore, in the composite slab 101, since the block 81 is fitted between the pair of structural steel members 71 and 72, the force acting on one structural steel member 71 can be transmitted to the other structural steel member 72 via the block 81. This allows the force acting on the structural steel member 71 in the X-axis direction to be distributed. Similarly, the force acting on the structural steel member 72 in the X-axis direction can be transmitted to the structural steel member 71. In addition, since the block 81 is fitted between the pair of structural steel members 71 and 72, the deformation of the structural steel members 71 and 72 in the X-axis direction can be suppressed. In the composite slab 101, the deformation of the structural steel members 71 and 72 in the X-axis direction can be suppressed by fitting the block 81 between the pair of structural steel members 71 and 72 compared to a configuration in which the block 81 is not placed.

[0053] Furthermore, the upper part of block 81 extends above the pair of structural steel members 71 and 72. According to this embodiment, the upper part of block 81, which extends above the structural steel members 71 and 72, can receive shear force. As a result, shear force can be transmitted between the RC slab 50 and the CLT panel 30 via block 81 and the structural steel members 71 and 72. The composite slab 101 can transmit a higher shear force compared to a configuration that does not include block 81 and only includes structural steel members 71 and 72. According to this embodiment, the shear force transmission performance between the RC slab 50 and the CLT panel 30 can be improved, and the load-bearing capacity and rigidity of the composite slab 101 can be improved.

[0054] Furthermore, in the composite slab 101, the multiple blocks 81 are arranged at predetermined intervals L2 in the longitudinal direction of the structural steel members 71 and 72. According to this embodiment, the shear force can be received by the multiple blocks 81 arranged at predetermined intervals L2 in the longitudinal direction of the structural steel members 71 and 72. In addition, concrete 51 is filled in the gap between the pair of structural steel members 71 and 72, in the area between the multiple blocks 81. According to this embodiment, the shear force can be transmitted between the RC slab 50 and the CLT panel 30 via the multiple blocks 81 and the structural steel members 71 and 72. According to this embodiment, the shear force transmission performance between the RC slab 50 and the CLT panel 30 can be improved, and the load-bearing capacity and rigidity of the composite slab 101 can be improved.

[0055] Furthermore, in the composite slab 101, the multiple blocks 81 are arranged at the grid points of a rectangular grid in plan view. According to this embodiment, the multiple blocks 81 arranged at the grid points can transmit shear force between the RC slab 50 and the CLT panel 30, improving the shear force transmission performance and improving the load-bearing capacity and rigidity of the composite slab. In addition, by evenly distributing the multiple blocks 81 on the upper surface 31 of the CLT panel 30, the transmission of shear force between the RC slab 50 and the CLT panel 30 is prevented from concentrating locally. This allows for the distribution of stress in the composite slab and improves its load-bearing capacity and rigidity.

[0056] Furthermore, in the composite slab 101, the material of the block 81 is one of wood, mortar, or concrete. According to the composite slab 101 of this embodiment, shear force can be transmitted between the RC slab 50 and the CLT panel 30 via the block 81 formed from wood, mortar, or concrete. According to this embodiment, shear force can be transmitted by the block 81 having a predetermined strength, improving the shear force transmission performance and improving the load-bearing capacity and rigidity of the composite slab 101.

[0057] Furthermore, according to the composite slab 101 of this embodiment, the CLT panel 30 has a predetermined thickness, and compared to the conventional technology, the thickness can be increased to ensure the load-bearing capacity and rigidity of the CLT panel 30, thereby reducing the amount of shoring required. The amount of shoring required when pouring concrete 51 can be reduced.

[0058] Furthermore, according to this embodiment, by increasing the thickness of the CLT panel 30, the amount of concrete in the RC slab 50 can be reduced, thereby making the overall composite slab 101 lighter. This reduces the number of shoring structures that need to be installed. As a result, the amount of work at the construction site can be reduced, shortening the construction period and reducing construction costs. The composite slab 101 may have cast-in-place concrete 51, or it may have precast concrete (PCa panels) that have been cast in advance at a factory or the like.

[0059] [Composite slab according to the second embodiment] Next, the composite slab 101B according to the second embodiment will be described with reference to Figure 5. Figure 5 is a plan view showing an example of the composite slab according to the second embodiment, and is a plan view showing the CLT panel before concrete is poured. The difference between the composite slab 101B according to the second embodiment shown in Figure 5 and the composite slab 101 according to the first embodiment is that the block 81B is continuous along the longitudinal direction of the pair of shaped steel members 71 and 72. Note that the same explanation as in the first embodiment will be omitted in the description of the second embodiment.

[0060] In the CLT panel 30 of the composite slab 101B, instead of multiple blocks 81 arranged at predetermined intervals L2 in the Y-axis direction, a continuous block 81B is arranged in the Y-axis direction. In the Y-axis direction, the length of block 81B may be longer than the length of the structural steel members 71 and 72. In the Y-axis direction, the length of block 81B may be the same as the length of the structural steel members 71 and 72, or it may be shorter than the length of the structural steel members 71 and 72.

[0061] The blocks 81B are arranged at a predetermined interval L3 in the X-axis direction. For example, the interval L3 is larger than the interval L1 in the first embodiment. The interval L3 is the distance between the center positions of adjacent blocks 81B in the X-axis direction.

[0062] Concrete 51 is poured onto the upper surface 31 of the CLT panel 30, and the structural steel members 71, 72 and block 81B are embedded in the concrete 51. Shear force is transmitted between the RC slab 50 and the CLT panel 30 by the engagement of the structural steel members 71, 72 and block 81B with the concrete 51.

[0063] The composite slab 101B according to this second embodiment also exhibits the same effects as the composite slab 101 according to the first embodiment. In the composite slab 101B, shear force can be transmitted between the RC slab 50 and the CLT panel 30 via blocks 81B that are continuous in a direction intersecting the reinforcing bars 61, thereby improving the shear force transmission performance and improving the load-bearing capacity and rigidity of the composite slab 101B. Furthermore, by transmitting shear force via blocks 81B that are continuous in the longitudinal direction, the efficiency of shear force transmission can be improved compared to when shear force is transmitted via multiple blocks 81 of short length. Therefore, the number of blocks 81B to be installed can be reduced.

[0064] [Synthetic slab according to the third embodiment] Next, the composite slab 101C according to the third embodiment will be described with reference to Figure 6. Figure 6 is an enlarged cross-sectional view showing a pair of structural steel members fixed to the upper surface of the CLT panel of the composite slab according to the third embodiment, and a block placed between the pair of structural steel members. The difference between the composite slab 101C according to the third embodiment shown in Figure 6 and the composite slab 101 according to the first embodiment is that the overhang height H3 of the block 81C is lower than the height H2 of the second pieces 74, 76 of the structural steel members 71, 72. In the description of the third embodiment, the same explanations as those for the first and second embodiments described above will be omitted.

[0065] The composite slab 101C includes block 81C in place of block 81. The upper surface 82 of block 81C is positioned lower than the upper ends of the second pieces 74 and 76 of the structural steel members 71 and 72. The overhang height H3 of block 81C is the height from the upper surface 31 of the CLT panel 30 to the upper surface 82 of block 81C. The overhang height H3 is lower than the height H2 of the second pieces 74 and 76 of the structural steel members 71 and 72. The upper ends of the second pieces 74 and 76 protrude above the upper surface 82 of block 81.

[0066] Concrete 51 is poured onto the upper surface 31 of the CLT panel 30, and the structural steel members 71, 72 and block 81C are embedded in the concrete 51. In the composite slab 101C, concrete 51 is filled into the recesses formed by the second pieces 74, 76 of the structural steel members 71, 72 and the upper surface 82 of block 81C. Shear force is transmitted between the RC slab 50 and the CLT panel 30 by the engagement of the structural steel members 71, 72 and block 81C with the concrete 51.

[0067] The composite slab 101C according to this third embodiment also exhibits the same effects as the composite slab 101 according to the first embodiment. In the composite slab 101C, shear force can be transmitted between the RC slab 50 and the CLT panel 30 via a pair of shaped steel members 71, 72 and block 81C, improving the shear force transmission performance and thereby improving the load-bearing capacity and rigidity of the composite slab 101B.

[0068] Furthermore, the force acting on one of the pair of structural steel members 71, 72 in the X-axis direction can be transmitted to the other structural steel member 72 via multiple blocks 81C. Similarly, the force acting on the structural steel member 72 in the X-axis direction can be transmitted to the structural steel member 71 via multiple blocks 81C. As a result, in the composite slab 101C, the forces acting on the structural steel members 71, 72 can be distributed via the blocks 81C.

[0069] Furthermore, other embodiments may be used in which other components are combined with the configurations listed in the above embodiments, and the present invention is not limited in any way to the configurations shown herein. In this regard, modifications can be made without departing from the spirit of the present invention, and can be appropriately determined according to the application form.

[0070] In the above embodiment, the case where the upper surface 82, lower surface 83, and side walls 84, 85 of the block 81 are flat is illustrated, but these surfaces may have irregular shapes formed on them. For example, grooves or steps may be formed on the upper surface 82 of the block 81.

[0071] In the above embodiment, wood, mortar, and concrete are given as examples of materials for the block 81, but the material of the block 81 is not limited to these. The material of the block 81 may be metal, for example, or any other material having a predetermined strength. It is sufficient that the shear force between the RC slab 50 and the CLT panel 30 can be transmitted through the block 81.

[0072] Furthermore, in the above embodiment, the shaped steel members 71 and 72 are not limited to angle steel, but may also be channel steel or other shaped steel members.

[0073] Furthermore, although the above embodiment illustrates the case where the first pieces 73 and 75 are arranged facing opposite directions, the arrangement of the structural steel members 71 and 72 is not limited to this. For example, the first pieces 73 and 75 may be arranged facing each other. In such a case, the first pieces 73 and 75 are placed below the block 81. Alternatively, the first pieces 73 and 75 may be arranged to protrude in the same direction.

[0074] The lower surface 83 of the block 81 may be in contact with the upper surface 31 of the CLT panel 30, or the lower surface 83 of the block 81 may be positioned above the upper surface 31 and not in contact with each other. For example, other members may be placed in the space between the lower surface 83 of the block 81 and the upper surface 31 of the CLT panel 30, or concrete 51 may be present.

[0075] Furthermore, although the above embodiment illustrates the case where the reinforcing bars 61 and 62 are positioned above the block 81, the reinforcing bars 61 and 62 may also be positioned on the upper surface 82 of the block 81. This allows the block 81 to be used as a support to hold up the reinforcing bars 61 and 62 when they are being placed. Similarly, a pair of shaped steel members 71 and 72 may be used as a support when placing the reinforcing bars 61 and 62. With such a composite slab 101, the number of supports required to hold up the reinforcing bars 61 and 62 can be reduced. [Explanation of Symbols]

[0076] 101, 101B, 101C: Composite slab 8,9: Stud 10: Beam 11: Web 12: Upper flange 12a:Top surface 13: Lower flange 30: CLT panel (wood-based paneling) 31: Top surface (first surface) 32: Bottom surface (2nd surface) 50: RC slab (reinforced concrete slab) 51: Concrete 61: Reinforcing bars (main reinforcement) 62: Reinforcement bars 71: Shape steel material (1st shape steel material) 72: Shape steel material (second shape steel material) 81, 81B, 81C: Block (block letters) X: X-axis direction (second direction) Y: Y-axis direction (first direction) Z: Z-axis direction (direction of the thickness of the wood panel)

Claims

1. A wood-based panel having a first surface and a second surface facing each other in the thickness direction, A reinforced concrete slab is laminated on the first surface of the aforementioned wood-based surface material, A first-shaped steel member and a second-shaped steel member extend in a first direction intersecting the main reinforcement of the reinforced concrete slab, are spaced apart in a second direction intersecting the first direction, and are fixed to the first surface. A composite slab characterized by comprising a block body that fits into the gap between the first structural steel member and the second structural steel member.

2. The composite slab according to claim 1, wherein the upper part of the block body protrudes above the first and second structural steel members.

3. The composite slab according to claim 1, characterized in that the plurality of block bodies are arranged at predetermined intervals in the first direction.

4. The composite slab according to claim 3, characterized in that the plurality of block bodies are arranged at the grid points of a rectangular grid in plan view.

5. The composite slab according to claim 1, characterized in that the block body is continuous in the longitudinal direction of the first and second structural steel members.

6. The composite slab according to claim 1, characterized in that the material of the block body is wood, mortar, or concrete.

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