Composite slab structure

Abstract

To provide a composite slab structure capable of integrating wooden surface material and a concrete slab while reducing construction load.SOLUTION: A composite slab structure 100 is provided with a wooden surface material 30 both ends of which are placed on a beam 10 and a reinforcement concrete slab 50 on the wooden surface material 30. The composite slab structure 100 is provided with shaped steel members 70 fixed on the wooden surface material 30, wherein the shaped steel members 70 are buried in the reinforcement concrete slab 50.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[0002] For example, in a composite slab using a deck plate, there is a method of integrating the deck plate and the concrete slab by embossing the deck plate. Also, in a composite slab using a wooden floor having a CLT panel (Cross Laminated Timber), there is a method of integrating the CLT panel and the concrete slab by driving lag screw bolts into the CLT panel (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, in consideration of the social situation demanding reduction of carbon dioxide emissions and the concern for the environment, the needs for building technologies utilizing wooden materials have been increasing. In a composite slab in which a concrete slab is constructed on the above-mentioned wooden material, the wooden material and the concrete slab are integrated by driving a plurality of lag screw bolts into the wooden material. However, there are problems such as a large amount of labor required for construction using a plurality of lag screw bolts and an extremely large construction burden.

[0005] An object of the present invention is to provide a composite slab structure capable of integrating a wooden facing material and a concrete slab while reducing the construction burden.

Means for Solving the Problems

[0006] To achieve the aforementioned objective, one embodiment of the composite slab structure according to the present invention is: A composite slab structure comprising a wooden panel with both ends resting on beams, and a reinforced concrete slab on top of the wooden panel, The structure includes a shaped steel member fixed on the aforementioned wooden surface material, The aforementioned shaped steel material is characterized by being embedded in the reinforced concrete slab.

[0007] According to this embodiment, by fixing a structural steel member having a predetermined length onto the wooden panel, the wooden panel and the concrete slab can be integrated using the structural steel member. Since the structural steel member has a predetermined length, the wooden panel and the concrete slab can be integrated without having to drive in a large number of lag screw bolts. Therefore, the burden of construction can be reduced. In this embodiment, the portion of the structural steel member that protrudes above the wooden panel acts as resistance, enabling high-strength integration of the wooden panel and the concrete slab.

[0008] In another embodiment of the present invention, The aforementioned steel material is A first board is positioned with its thickness direction aligned with the thickness direction of the wood surface material and fixed on top of the wood surface material, The material comprises a second plate which is positioned in a direction whose thickness direction intersects with the thickness direction of the first plate and which protrudes upward from the first plate, The second plate material is characterized by having an opening that penetrates through the plate material in the thickness direction.

[0009] According to this embodiment, the second plate material protrudes upward, allowing the wood panel material and the concrete slab to be integrated with high strength. Furthermore, an opening is provided in the second plate material that protrudes upward, so that when concrete is poured, the concrete flows through the opening, preventing obstruction of the concrete flow. In addition, after the concrete has achieved its strength, the concrete remains in the opening, and by pouring the concrete so that it penetrates the second plate material, the wood panel material and the concrete slab can be integrated with high strength.

[0010] In another embodiment of the present invention, The reinforced concrete slab has reinforcing bars extending in a direction intersecting the longitudinal direction of the shaped steel member, The reinforcing bars are characterized in that they are arranged on top of the shaped steel material, which is used as a spacer.

[0011] According to this embodiment, by using structural steel as a spacer, the need to install spacers separately is eliminated. This reduces the burden of construction. Furthermore, the structural steel has a predetermined length and can support multiple reinforcing bars.

[0012] In another embodiment of the present invention, The aforementioned shaped steel member is characterized in that it extends in the longitudinal direction of the aforementioned wood panel.

[0013] According to this embodiment, the length of the structural steel can be increased by extending the structural steel in the longitudinal direction of the wooden panel. This reduces the amount of structural steel to be installed, thereby easing the construction burden.

[0014] In another embodiment of the present invention, The structural steel members are characterized by extending in a direction intersecting the longitudinal direction of the wood panel.

[0015] According to this embodiment, by extending the shaped steel members in a direction intersecting the longitudinal direction of the wood panel, displacement between the wood panel and the concrete slab in the longitudinal direction of the wood panel can be suppressed.

[0016] In another embodiment of the present invention, On the upper surface of the beam, the ends of multiple wooden panel members extending in a direction intersecting the longitudinal direction of the beam are arranged spaced apart from each other. The present invention is characterized in that multiple structural steel members fixed to the multiple wooden surface materials are connected to one another.

[0017] According to this aspect, a plurality of wood surface materials spaced apart in a direction intersecting the longitudinal direction of the beam can be connected via steel sections. Thereby, before placing concrete, the plurality of wood surface materials can be temporarily fixed by connecting them to each other. Therefore, displacement of the wood surface materials is suppressed. Further, above the beam, by extending steel sections so as to intersect the beam, the beam, the concrete slab, and the wood surface materials can be integrated with high strength.

Advantages of the Invention

[0018] As can be understood from the above description, according to the composite slab structure, while reducing the construction burden, the wood surface material and the concrete slab can be integrated.

Brief Description of the Drawings

[0019] [Figure 1] It is a plan view showing an example of the composite slab structure according to the first embodiment. [Figure 2] It is a cross-sectional view showing an example of the composite slab structure according to the first embodiment. [Figure 3] It is a perspective view showing the steel sections and reinforcing bars of the composite slab structure according to the first embodiment. [Figure 4] It is a cross-sectional view showing the steel sections and reinforcing bars embedded in the concrete slab. [Figure 5] It is a cross-sectional view showing an example of the composite slab structure according to a modification. [Figure 6] It is a plan view showing an example of the composite slab structure according to a modification. [Figure 7] It is a plan view showing an example of the composite slab structure according to the second embodiment. [Figure 8] It is a cross-sectional view showing an example of the composite slab structure according to the second embodiment. [Figure 9] It is a cross-sectional view showing an example of the composite slab structure according to the second embodiment.

Modes for Carrying Out the Invention

[0020] The composite slab structure according to the embodiment will be described below with reference to the attached drawings. In this specification and drawings, substantially identical components may be denoted by the same reference numerals to avoid redundant explanations.

[0021] [Composite slab structure according to the first embodiment] First, an example of a composite slab structure according to the embodiment will be described with reference to Figures 1 to 4. Here, Figure 1 is a plan view showing an example of a composite slab structure according to the first embodiment. Figure 2 is a cross-sectional view showing an example of a composite slab structure according to the first embodiment. Figure 3 is a perspective view showing the shaped steel and reinforcing bars of the composite slab structure according to the first embodiment. Figure 4 is a cross-sectional view showing the shaped steel and reinforcing bars embedded in a concrete slab. In addition, in each figure, arrows indicating the X-axis, Y-axis, and Z-axis directions, which are three mutually orthogonal directions, may be shown as appropriate. The X-axis and Y-axis directions are along the horizontal direction. The Y-axis direction is along the longitudinal direction of the beam 10. The X-axis direction is a direction that intersects the longitudinal direction of the beam 10. The Z-axis direction is along the vertical direction.

[0022] The building frame having a composite slab structure 100 comprises columns and beams 10. The columns may be, for example, steel-framed (S-frame) columns. The columns are not limited to steel-framed (S-frame) columns, but may also be reinforced concrete (RC-frame) or steel-reinforced concrete (SRC-frame) columns.

[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 Figure 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. Note that the beam 10 is not limited to a steel frame beam, but may also be a reinforced concrete (SRC) or steel-reinforced concrete (RC) beam.

[0025] The composite slab structure 100 comprises a CLT panel 30 and a reinforced concrete slab 50. Note that "reinforced concrete slab" may be abbreviated as "RC slab".

[0026] The RC slab 50 has concrete 40 poured on top of the CLT panel 30 and reinforcing bars 120 and 150 embedded in the concrete 40. The concrete 40 may be ordinary concrete, for example.

[0027] As shown in Figures 2 and 3, the reinforcing bars 120 are spaced apart in the X-axis direction and extend in the Y-axis direction. The reinforcing bars 150 are spaced apart in the Y-axis direction and extend in the X-axis direction. The reinforcing bars 120 and 150 are, for example, deformed reinforcing bars and are arranged in directions that intersect each other. Note that the reinforcing bars 120 and 150 are not limited to deformed reinforcing bars, but may be other types of reinforcing bars. The reinforcing bars 120 and 150 may also be wires arranged in a grid pattern. The reinforcing bars 120 and 150 may each be arranged in two layers, upper and lower.

[0028] As shown in Figure 2, the CLT panel 30 is positioned below the RC slab 50. The CLT panel 30 is formed by laminating multiple layers 32, 34, and 36, and the sawn lumber contained in these layers 32, 34, and 36 is arranged so that the grain direction is perpendicular to that of the sawn lumber in the adjacent layers. The multiple layers 32, 34, and 36 are bonded to each other. The CLT panel 30 is an example of a wood-based panel. The wood-based panel is not limited to the CLT panel 30, and other wood-based panels such as LVL (Laminated Veneer Lumber) may also be used.

[0029] 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 of the beam 10.

[0030] As shown in Figures 1 to 4, the composite slab structure 100 comprises structural steel members 70 fixed on the CLT panel 30. The structural steel members 70 are spaced apart in the Y-axis direction and extend in the X-axis direction. The structural steel members 70 extend along the longitudinal direction of the CLT panel 30. The structural steel members 70 have a predetermined length in the X-axis direction.

[0031] As shown in Figures 3 and 4, the structural steel member 70 is, for example, an angle steel. The structural steel member 70 has a first piece 72 fixed on the CLT panel 30 and a second piece 74 projecting upward from the second piece 74. The first piece 72 is an example of a first plate, and the second piece 74 is an example of a second plate. The thickness direction of the first piece 72 is along the Z-axis direction. The thickness direction of the second piece 74 is along the Y-axis direction.

[0032] The first piece 72 is fixed to the CLT panel 30 by a plurality of bolts 5. Bolt holes are formed in the first piece 72 through which the bolts 5 are inserted. The bolts 5 extend in the Z-axis direction and are driven into the CLT panel 30. The plurality of bolts 5 are arranged at predetermined intervals in the X-axis direction. The bolts 5 are, for example, lag screw bolts or coach screw bolts. Alternatively, the structural steel member 70 may be fixed to the CLT panel 30 using other rod-shaped fixing members such as nails instead of bolts 5.

[0033] The width of the second piece 74, which is its height along the Z-axis direction, may be, for example, about half the thickness of the concrete 40 on the CLT panel 30. The second piece 74 has openings 76 that penetrate in the thickness direction. Multiple openings 76 are arranged in the longitudinal direction of the structural steel member 70. When concrete 40 is poured, the concrete 40 can flow through the openings 76. The concrete 40 penetrates the openings 76 and continues in the thickness direction of the second piece 74. The concrete 40 present on both sides in the thickness direction of the second piece 74 is connected through the openings 76.

[0034] The structural steel members 70 function as spacers when arranging the reinforcing bars 120 and 150. The reinforcing bar 120 extends in the thickness direction of the second piece 74 and rests on the second piece 74. The reinforcing bar 120 is supported and arranged by multiple structural steel members 70. The reinforcing bar 150 is arranged on top of the reinforcing bar 120.

[0035] As shown in Figure 2, multiple CLT panels 30 are mounted on the upper flange 12, spaced apart in the X-axis direction. The ends 30a of the multiple CLT panels 30 are spaced apart from each other.

[0036] Multiple studs 8 are provided in the gaps between the ends of multiple CLT panels 30, projecting upward from the upper flange 12. Multiple studs 8 are arranged at predetermined intervals in the X-axis direction. Multiple studs 8 are arranged at predetermined intervals in the longitudinal direction of the beam 10. The studs 8 are welded to the upper flange 12, for example.

[0037] Concrete 40 is poured into the gap on the upper flange 12, integrating the RC slab 50 and the beam 10. Multiple studs 8 are embedded in the concrete 40.

[0038] (Effects of the composite slab structure 100) According to the composite slab structure 100 of the first embodiment, by fixing a shaped steel member 70 having a predetermined length onto the CLT panel 30, the CLT panel 30 and the RC slab 50 can be integrated using the shaped steel member 70. Since the shaped steel member 70 has a predetermined length, the wood panel and the concrete slab can be integrated without having to drive in lag screw bolts to integrate them with the concrete 40. The portion of the shaped steel member 70 that protrudes above the CLT panel 30 acts as resistance, transmitting shear force and enabling high-strength integration of the CLT panel 30 and the concrete slab. Furthermore, even when lag screw bolts are driven in to fix the shaped steel member 70, it is not necessary to drive in lag screw bolts that are positioned to protrude upward from the CLT panel 30, thus reducing the construction burden.

[0039] Furthermore, in the composite slab structure 100, the shaped steel members 70 extend in the longitudinal direction (X-axis direction) of the wood panel 30. With this configuration of the composite slab structure 100, the length of the shaped steel members 70 can be increased by extending them in the longitudinal direction of the CLT panel 30. By using long shaped steel members 70, the quantity of shaped steel members to be installed can be reduced, thereby easing the construction burden.

[0040] Furthermore, in the composite slab structure 100, the shaped steel member 70 has a first piece 72 whose thickness direction is arranged in the thickness direction of the CLT panel 30 and fixed on the CLT panel 30, and a second piece 74 whose thickness direction is arranged in a direction intersecting the thickness direction of the first piece 72 and protruding upward from the first piece 72. In the composite slab structure 100, angle steel can be used as the shaped steel member 70. By using angle steel, which is a general-purpose product, costs can be reduced. With the composite slab structure 100 configured in this way, the second piece 74 is arranged to protrude upward from the CLT panel 30, thereby enabling high-strength integration of the CLT panel 30 and the RC slab 50.

[0041] Furthermore, in the composite slab structure 100, the RC slab 50 has reinforcing bars 120 that extend in a direction intersecting the longitudinal direction of the shaped steel member 70, and the reinforcing bars 120 are arranged on top of the shaped steel member 70, which acts as a spacer.

[0042] With this composite slab structure 100 configuration, the structural steel member 70 used as a shear key is used as a spacer, eliminating the need to construct a separate spacer. This reduces the construction burden. In addition, the structural steel member 70 has a predetermined length and can support multiple reinforcing bars 120.

[0043] Furthermore, the second piece 74 of the structural steel member 70 has an opening 76 that penetrates in the thickness direction of the second piece 74. With this configuration of composite slab structure 100, the opening 76 is provided in the second piece 74 that protrudes upward, so that when concrete 40 is poured, the concrete 40 flows through the opening 76, preventing the flow of concrete 40 from being obstructed. In addition, after the strength of the concrete 40 is achieved, the concrete remains in the opening 76 and continues to penetrate the second piece 74, thereby enabling a higher strength integration of the CLT panel 30 and the RC slab 50.

[0044] [Composite slab structure related to a modified example] Next, a modified composite slab structure 100 will be described with reference to Figures 5 and 6. Figure 5 is a cross-sectional view showing an example of a modified composite slab structure. Figure 6 is a plan view showing an example of a modified composite slab structure.

[0045] As shown in Figures 5 and 6, in the composite slab structure 100, multiple CLT panels 30 are arranged spaced apart in the X-axis direction. The beam 10 supports the multiple CLT panels 30 spaced apart in the X-axis direction. In the modified composite slab structure 100, the structural steel members 70, 70C fixed to the multiple CLT panels 30 are connected to each other in the X-axis direction. However, the structural steel members 70, 70C may not be connected to each other.

[0046] A structural steel member 70C fixed to one CLT panel 30 that is spaced apart in the X-axis direction extends outward from the CLT panel 30 and spans across the other CLT panel 30. The ends of the connected structural steel members 70 and 70C are arranged to overlap in the Y-axis direction. Specifically, the second pieces 74 are overlapped in the Y-axis direction.

[0047] The ends of the structural steel members 70 and 70C are provided with openings that penetrate in the direction of the plate thickness. The ends of the structural steel members 70 and 70C are connected by rod-shaped fixing members 9 that penetrate in the direction of the plate thickness. The rod-shaped fixing members 9 may be bolts and nuts, pins, or other fixing members. The connection of the structural steel members 70 and 70C is not limited to using rod-shaped fixing members 9, but can be connected using other fixing members. Furthermore, the connection of the structural steel members 70 and 70C may also be made by arranging the first pieces 72 so that they overlap in the Z-axis direction, for example.

[0048] In the composite slab structure 100 according to this modified example, multiple CLT panels 30 spaced apart in a direction intersecting the longitudinal direction of the beam 10 can be connected via structural steel members 70 and 70C. This allows for temporary fixing of the multiple CLT panels 30 by connecting them to each other before pouring the concrete 40. As a result, displacement of the CLT panels 30 is suppressed. Furthermore, by extending the structural steel members 70C above the beam 10 so as to intersect the beam 10, the beam 10, the RC slab 50, and the CLT panels 30 can be integrated with high strength.

[0049] Furthermore, the structural steel member 70C positioned above the beam 10 may have an opening that penetrates the first piece 72 in the thickness direction. This allows the concrete 40 to flow through the opening in the first piece 72 above the beam 10 when the concrete 40 is poured, preventing obstruction of the concrete 40's flow. Additionally, after the concrete 40 has developed its strength, it can be formed to be continuous, penetrating the structural steel member 70C in the Z-axis direction, thereby enabling a stronger integration of the beam 10, RC slab 50, and CLT panel 30.

[0050] [Composite slab structure according to the second embodiment] Next, the composite slab structure 100B according to the second embodiment will be described with reference to Figures 7 to 9. Figure 7 is a plan view showing an example of the composite slab structure according to the second embodiment. Figure 8 is a cross-sectional view showing an example of the composite slab structure according to the second embodiment. Figure 9 is a cross-sectional view showing an example of the composite slab structure according to the second embodiment. The difference between the composite slab structure 100B according to the second embodiment and the composite slab structure 100 according to the first embodiment is that it includes a shaped steel member 70B arranged in a different orientation from the shaped steel member 70. Note that in the description of the second embodiment, the same explanation as in the first embodiment will be omitted.

[0051] The structural steel members 70B extend in the Y-axis direction. Multiple structural steel members 70B are arranged at intervals along the Y-axis direction. Furthermore, multiple structural steel members 70B arranged in the Y-axis direction are then arranged at intervals along the X-axis direction.

[0052] Reinforcing bar 150 extends in the X-axis direction. Reinforcing bar 150 is arranged to rest on multiple structural steel members 70B. Reinforcing bar 120 is placed on top of reinforcing bar 150 and extends in the Y-axis direction. This allows the structural steel members 70B to be used as spacers, enabling the arrangement of multiple reinforcing bars 120 and 150.

[0053] In this second embodiment, the composite slab structure 100B can be integrated with the CLT panel 30 and the RC slab 50 by arranging the shaped steel members 70B in a direction intersecting the longitudinal direction of the CLT panel 30.

[0054] In the composite slab structure 100B, the use of short-length structural steel members 70B makes handling of the structural steel members 70B easier. Furthermore, since multiple structural steel members 70B are arranged at predetermined intervals in the Y-axis direction, when concrete 40 is poured, the concrete 40 flows between the structural steel members 70B that are spaced apart in the Y-axis direction. Therefore, it is not necessary to provide an opening in the second piece 74.

[0055] Furthermore, in the composite slab structure 100B, the thickness direction of the second piece 74 is positioned in the longitudinal direction of the CLT panel 30, thereby suppressing displacement between the CLT panel 30 and the RC slab 50 in the longitudinal direction of the CLT panel 30.

[0056] In the composite slab structure 100B according to this second embodiment, other structural steel members extending in the X-axis direction may be placed above the beam 10 to connect and temporarily fix the structural steel members 70B fixed to the multiple CLT panels 30 that are spaced apart in the X-axis direction.

[0057] 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.

[0058] In the above embodiment, an example is given in which angle steel is used as the structural steel material 70, but the structural steel material 70 is not limited to angle steel, and other structural steel materials such as channel steel may be used.

[0059] Alternatively, the structural steel members 70 fixed to multiple CLT panels 30 aligned in the longitudinal direction of the beam 10 may be connected to each other. This can suppress misalignment between the CLT panels 30 aligned in the longitudinal direction of the beam 10. [Explanation of Symbols]

[0060] 100,100B: Composite slab structure 5: Bolt 8: Stud 9: Fixing member 10: Beam 11: Web 12: Upper flange 12a:Top surface 30: CLT panel (wood-based paneling) 32,34,36: layer 40: Concrete 50: RC slab (reinforced concrete slab) 70,70B,70C: Shaped steel material 72: 1st piece (1st plate material) 74:Second piece (second board material) 76:Aperture 120: Reinforcement bars 150: Reinforcement bars X: X-axis direction (longitudinal direction of the wood panel) Y: Y-axis direction (longitudinal direction of the beam) Z: Z-axis direction (vertical direction)

Claims

1. A composite slab structure comprising a wooden panel with both ends resting on beams, and a reinforced concrete slab on top of the wooden panel, It comprises a plurality of shaped steel members having a predetermined length and fixed on each of the aforementioned wooden surface materials, A composite slab structure characterized in that a plurality of the aforementioned shaped steel members extend from one end to the other of the wood panel along a first direction which is the longitudinal direction of the wood panel and are arranged at intervals in a second direction intersecting the first direction, or a plurality of the aforementioned shaped steel members extend in the second direction and are arranged at intervals in the second direction and aligned in the second direction are arranged at intervals in the first direction and are embedded in the reinforced concrete slab.

2. The aforementioned steel material is A first board is positioned with its thickness direction aligned with the thickness direction of the wood surface material and fixed on top of the wood surface material, The material comprises a second plate which is positioned in a direction whose thickness direction intersects with the thickness direction of the first plate and which protrudes upward from the first plate, The composite slab structure according to claim 1, characterized in that the second plate material has an opening that penetrates through the thickness direction of the second plate material.

3. The reinforced concrete slab has reinforcing bars extending in a direction intersecting the longitudinal direction of the shaped steel member, The composite slab structure according to claim 1 or 2, characterized in that the reinforcing bars are arranged on top of the shaped steel material as spacers.

4. On the upper surface of the beam, the ends of multiple wooden panel members extending in a direction intersecting the longitudinal direction of the beam are arranged spaced apart from each other. The composite slab structure according to any one of claims 1 to 3, characterized in that the multiple shaped steel members fixed to the multiple wood-based surface materials are connected to one another.

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