Composite slab structure, and construction method for composite slab structure

Abstract

To provide a composite slab structure improved in fire resistance performance.SOLUTION: In a composite slab structure 100, a composite slab 101 is formed of: a deck slab 60 formed of a deck plate 20 alternately provided with crest parts 22 and trough parts 24 and a reinforced concrete slab 50 on the deck plate 20; and a wooden face material 30 located under the deck plate 20 and joined to the deck plate 20 through a rod-like fixing member 5. A clearance G1 is formed between the crest part 22 of the deck plate 20 and the wooden face material 30, and the wooden face material 30 is supported by beams 10.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a composite slab structure and a construction method of the composite slab structure.

Background Art

[0002] In recent years, deck slabs or flat slabs are often constructed on slabs. Such slabs are formed by placing concrete on a deck plate or flat slab supported by the beams of a building. Instead of this deck plate or flat slab, there is a case where a CLT panel (Cross Laminated Timber, cross-laminated timber) is used as the lower surface of a reinforced concrete slab (see, for example, Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Wooden materials such as CLT panels have low carbon dioxide emissions during production and can fix a large amount of carbon, so the need for the use of wooden materials is increasing. In response to such an increase in demand, for example, the adoption of CLT panels in structural floors is increasing. However, as a weakness of wooden materials, their fire resistance is low, and since wooden materials self-ignite, it is difficult to use wooden materials alone in a fire-resistant structure. Therefore, there are cases where a wooden material and reinforced concrete having fire resistance are combined and used.

[0005] The present invention aims to provide a composite slab structure comprising a deck slab and a wood-based surface material, which can improve fire resistance, and a method for constructing such a composite slab structure. [Means for solving the problem]

[0006] To achieve the aforementioned objective, one embodiment of the composite slab structure according to the present invention is: A deck slab is formed by a deck plate having alternating peaks and valleys, and a reinforced concrete slab placed on top of the deck plate, A composite slab is formed by a wooden surface material located below the aforementioned deck plate and joined to the deck plate via a rod-shaped fixing member, A gap is formed between the ridge portion of the deck plate and the wood surface material. The wood panel is characterized by being supported by a beam.

[0007] According to this embodiment, the underside of the deck slab, which consists of a deck plate and a reinforced concrete slab, is covered with a wooden panel. In the event of a fire, the deck slab, with its underside covered by the wooden panel, can bear the load. Because the underside of the deck slab is covered with the wooden panel, the damage caused by the fire to the entire composite slab structure can be delayed. In addition, a gap is formed between the wooden panel and the ridges of the deck plate, creating an air layer. This air layer provides thermal insulation, which suppresses heat transfer from the wooden panel to the deck slab during a fire, thereby reducing damage to the deck slab. As a result, the fire resistance of the composite slab structure can be improved.

[0008] Furthermore, in the composite slab structure of this embodiment, the wood panel is joined to the deck slab via rod-shaped fixing members, allowing stress to be transmitted by the fixing members, and enabling the deck slab and wood panel to withstand long-term loads. As a result, the slab thickness of the reinforced concrete slab can be reduced compared to a configuration without wood paneling. In the composite slab structure of this embodiment, fire resistance is improved and the slab thickness can be reduced, thus eliminating the need to provide fire-resistant reinforcement bars. For example, compared to conventional structures that require fire-resistant reinforcement bars above the valleys of the deck plate, the composite slab structure of this embodiment has improved fire resistance, so it can meet the required fire resistance performance even without fire-resistant reinforcement bars.

[0009] Furthermore, according to the composite slab structure of this embodiment, since the underside of the deck slab is covered with a wood-based panel, the ceiling formed by the deck slab can be made of exposed wood.

[0010] In another embodiment of the present invention, The aforementioned rod-shaped fixing member is a bolt. A hole is formed in the valley portion of the deck plate through which the bolt is inserted. A cylindrical reinforcing member is fixed to the upper surface of the valley portion at a position corresponding to the hole, to reinforce the area around the hole. The bolt is inserted through the cylindrical reinforcing member and protrudes from the cylindrical reinforcing member on the side opposite to the deck plate. The reinforcing member and the portion of the bolt protruding from the reinforcing member are characterized by being embedded in the reinforced concrete slab.

[0011] According to this embodiment, by using bolts as rod-shaped fixing members, the deck slab and the wood panel can be joined with high strength by inserting the bolts into holes formed in the valleys of the deck slab. Furthermore, according to this embodiment, the portion of the bolt protruding from the reinforcing member is embedded in the reinforced concrete slab, thereby integrating the concrete, deck plate, and wood panel.

[0012] Also, in another aspect of the present invention, the bolt is a lag screw bolt or a coach screw bolt.

[0013] According to this aspect, the deck slab and the wooden surface material can be joined with high strength by a lag screw bolt or a coach screw bolt.

[0014] Also, in another aspect of the present invention, on the upper surface of the beam, ends of a plurality of the wooden surface materials extending in a direction intersecting the longitudinal direction of the beam are placed with a gap therebetween, and concrete is placed in the gap above the beam, and the reinforced concrete slab and the beam are integrated.

[0015] According to this aspect, by integrating the reinforced concrete slab and the beam, the reinforced concrete slab can be firmly supported by the beam.

[0016] Also, in another aspect of the present invention, studs embedded in the concrete are provided in the gap above the beam.

[0017] According to this aspect, the reinforced concrete slab and the beam can be firmly integrated, and the reinforced concrete slab can be supported by the beam.

[0018] Also, in another aspect of the present invention, the wooden surface material is a CLT panel.

[0019] According to this aspect, since the wooden surface material is a CLT panel, the shear strength is high and a wooden surface material with as wide a width as possible can be used, so the workability is also improved.

[0020] Also, in another aspect of the present invention, The gap is provided with a sound-absorbing material in part or in whole, which is a feature.

[0021] According to this aspect, the sound-absorbing material provided in the gap can reduce the transmission of sound from the upper floor to the lower floor and from the lower floor to the upper floor.

[0022] Also, one aspect of the construction method of the composite slab structure according to the present invention is as follows: A step of placing the deck plate on the wooden facing material so that the valley portion of the deck plate having alternating peak portions and valley portions contacts the wooden facing material and a gap is formed between the peak portion and the wooden facing material; A step of joining the deck plate and the wooden facing material using a rod-shaped fixing member; A step of placing the wooden facing material joined with the deck plate on the beam; A step of forming a reinforced concrete slab on the deck plate, which is characterized by including these steps.

[0023] According to this aspect, by joining the wooden facing material and the deck plate before placing the wooden facing material on the beam, it is possible to eliminate the need to place the wooden facing material and the deck plate separately on the beam, and the construction time at the construction site can be shortened.

[0024] Also, one aspect of the construction method of the composite slab structure according to the present invention is as follows: A step of placing the wooden facing material on the beam; A step of placing the deck plate on the wooden facing material so that the valley portion of the deck plate having alternating peak portions and valley portions contacts the wooden facing material and a gap is formed between the peak portion and the wooden facing material; A step of joining the deck plate and the wooden facing material using a rod-shaped fixing member; A step of forming a reinforced concrete slab on the deck plate, which is characterized by including these steps.

[0025] According to this embodiment, by placing the wooden panel on the beam and then placing the deck plate on top of the wooden panel on the beam, the wooden panel and the deck plate can be placed on the beam separately. When lifting the wooden panel and the deck plate onto the beam, the wooden panel and the deck plate can be lifted separately, thus reducing the weight of the members that need to be lifted at once. [Effects of the Invention]

[0026] As can be understood from the above explanation, with the composite slab structure and the construction method for the composite slab structure, the gap formed between the wood panel and the ridge of the deck plate suppresses heat transfer from the wood panel to the deck plate, thereby reducing damage to the deck plate. As a result, the fire resistance performance of the composite slab structure can be improved. [Brief explanation of the drawing]

[0027] [Figure 1] This is a perspective view showing an example of a composite slab structure according to the first embodiment. [Figure 2] This is a cross-sectional view showing an example of a composite slab structure according to the first embodiment. [Figure 3] This is a plan view showing an example of a composite slab structure according to the first embodiment, and shows the deck plate before concrete is poured. [Figure 4] This is an enlarged cross-sectional view showing the bolts and reinforcing members of a modified composite slab structure. [Figure 5] This is a cross-sectional view showing an example of a composite slab structure according to the second embodiment. [Figure 6] This is a process diagram showing the procedure for the construction method of the composite slab structure according to the third embodiment. [Figure 7] This is a process diagram showing the procedure for the construction method of the composite slab structure according to the fourth embodiment. [Modes for carrying out the invention]

[0028] The composite slab structure and the construction method of the composite slab structure according to the embodiment will be described below with reference to the attached drawings. In this specification and the drawings, substantially identical components may be denoted by the same reference numerals to avoid redundant explanations.

[0029] [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 3. Here, Figure 1 is a perspective 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 plan view showing an example of a composite slab structure according to the first embodiment, and shows the deck plate before concrete is poured. 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 Z-axis direction is along the vertical direction.

[0030] The building frame having a composite slab structure 100 comprises columns 2 and main beams 10A and 10B. Column 2 is shown in Figure 3. Column 2 is positioned at the grid points of a rectangular grid in plan view. Multiple columns 2 are arranged at predetermined intervals in the X-axis and Y-axis directions. Note that Figure 3 shows a single column 2.

[0031] Column 2 is, for example, made of steel (S structure) and is a square steel pipe. Column 2 is not limited to a steel structure; it may also be made of reinforced concrete (RC structure) or steel-reinforced concrete (SRC structure). Furthermore, Column 2 may be a column formed from CFT (Concrete-Fiber Capacitor).

[0032] The main beams 10A and 10B are, for example, steel beams. Main beam 10A extends in the X-axis direction, and main beam 10B extends in the Y-axis direction. Both ends of main beams 10A and 10B are connected to a pair of columns 2. The building structure may also include secondary beams connected to main beams 10A and 10B.

[0033] As shown in Figures 1 and 2, the main beams 10A and 10B are made of, for example, H-shaped steel and have a web 11, an upper flange 12, and a lower flange 13. Note that the main beams 10A and 10B are not limited to steel beams, but may also be steel-reinforced concrete or RC beams. The main beams 10A and 10B may also be beams in a hybrid construction method.

[0034] The composite slab structure 100 comprises a composite slab 101, which has a deck slab 60 and a CLT panel 30. The deck slab 60 has a deck plate 20 and a reinforced concrete slab 50. Note that "reinforced concrete slab" may be abbreviated as "RC slab".

[0035] The deck plate 20 is provided with alternating peaks 22 and valleys 24. The deck plate 20 may be made of, for example, corrugated steel. The peaks 22 and valleys 24 are arranged alternately in the Y-axis direction. The deck plate 20 has a top plate 26, a bottom plate 27, and inclined plates 28, 29. The top plate 26, inclined plate 29, bottom plate 27, and inclined plate 28 are arranged in this order in the Y-axis direction. The top plate 26 is positioned above the bottom plate 27 in the Z-axis direction. When viewed in the X-axis direction, the inclined plates 28, 29 are inclined with respect to the top plate 26 and bottom plate 27. These top plate 26, bottom plate 27, and inclined plates 28, 29 are formed, for example, by bending a single sheet of material by press working.

[0036] The RC slab 50 comprises concrete 40 poured onto the deck plate 20 and reinforcing bars 120 and 150 embedded in the concrete 40. The concrete 40 is, for example, ordinary concrete. The RC slab 50 also includes portions on the main beams 10A and 10B.

[0037] Reinforcement bars 120 are spaced apart in the Y-axis direction and extend in the X-axis direction. Reinforcement bars 150 are spaced apart in the X-axis direction and extend in the Y-axis direction. Reinforcement bars 120 and 150 are, for example, deformed reinforcement bars and are arranged in directions that intersect each other. Reinforcement bars 150 are main reinforcement bars, and reinforcement bars 120 are distribution reinforcement bars. Note that reinforcement bars 120 and 150 are not limited to deformed reinforcement bars, but may also be other types of reinforcement bars or welded wire mesh. In addition, the reinforcement of the RC slab 50 may include reinforcement bars other than main reinforcement bars and distribution reinforcement bars.

[0038] The CLT panel 30 is positioned beneath the deck plate 20. 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.

[0039] The CLT panel 30 has fire-resistant properties. For example, in the case of a 45mm thick CLT panel 30 made from larch, when heated for one hour, the temperature of the steel material on the opposite side of the heated surface can be kept below 300°C, and the 2% offset yield strength of the steel material at that time is about 2 / 3 of that before heating.

[0040] The CLT panel 30 is supported by multiple main beams 10A and 10B. The ends of the CLT panel 30 rest on the upper flanges 12 of the main beams 10A and 10B.

[0041] As shown in Figure 2, the CLT panel 30 and the deck plate 20 are joined via a plurality of bolts 5. As shown in Figure 3, a plurality of bolt holes 6 are opened in the valley 24 of the deck plate 20. The bolt holes 6 are provided in the bottom plate 27 of the deck plate 20. The plurality of bolt holes 6 are formed at predetermined intervals in the X-axis and Y-axis directions.

[0042] The bolt 5 is inserted through the bolt hole 6 to join the deck plate 20 and the CLT panel 30. The head of the bolt 5 is positioned in the valley 24 of the deck plate 20 and embedded in the concrete 40. The bolt 5 is an example of a rod-shaped fastener, such as a lag screw bolt or a coach screw bolt. The rod-shaped fastener is not limited to a bolt and may be any other type of screw.

[0043] The CLT panel 30 is positioned to cover the underside of the deck plate 20. In other words, the deck plate 20 is placed on top of the CLT panel 30. Specifically, the bottom plate 27 of the deck plate 20 is positioned to be in contact with the top surface of the CLT panel 30, and the top plate 26 and the inclined plates 28, 29 are positioned to form a gap G1 between them and the CLT panel 30. A gap G1 is formed between the ridges 22 of the deck plate 20 and the CLT panel 30.

[0044] The CLT panel 30 may be fixed to the upper flange 12 of the main beams 10A and 10B.

[0045] As shown in Figure 2, multiple CLT panels 30 are mounted on the upper flange 12, spaced apart in the Y-axis direction. The ends of the multiple CLT panels 30 are spaced apart from each other.

[0046] Multiple studs 8 are provided in the gaps between the ends of multiple CLT panels 30, projecting upward from the upper flange 12. The multiple studs 8 are arranged at predetermined intervals along the longitudinal direction of the main beam 10A. The studs 8 are welded to the upper flange 12, for example.

[0047] Concrete 40 is poured into the gap on the upper flange 12, integrating the RC slab 50 and the main beam 10A. Multiple studs 8 are embedded in the concrete 40.

[0048] Similar to the main beam 10A, multiple CLT panels 30 are placed on the upper flange 12 of the main beam 10B, creating gaps between the ends of the CLT panels 30. Multiple studs 8 are provided on the upper flange 12 of the main beam 10B. Concrete 40 is poured into the gaps on the upper flange 12 of the main beam 10B, integrating the RC slab 50 and the main beam 10B.

[0049] Furthermore, fire-resistant coating 80 is applied to the main beams 10A and 10B. For example, fire-resistant coating 80 is applied to the lower surface of the upper flange 12, the side surface of the web 11, and the upper and lower surfaces of the lower flange 13 of the main beams 10A and 10B.

[0050] (Effects of the composite slab structure 100) According to the composite slab structure 100 of the first embodiment, the lower surface of the composite slab 101, which consists of a deck plate 20 and an RC slab 50, is covered by a CLT panel 30. In the event of a fire, the composite slab 101, with its lower surface covered by the CLT panel 30, can bear the load. Because the lower surface of the composite slab 101 is covered by a wood-based panel, the damage to the composite slab structure 100 as a whole can be delayed due to the fire. In addition, a gap G1 is formed between the CLT panel 30 and the ridge portion 22 of the deck plate 20, and an air layer is formed in this gap G1. This air layer exhibits thermal insulation properties, which suppresses heat transfer from the CLT panel 30 to the deck slab 60 in the event of a fire, thereby reducing damage to the deck slab 60. As a result, the fire resistance performance of the composite slab structure 100 can be improved.

[0051] Furthermore, in the composite slab structure 100, the CLT panel 30 is joined to the deck slab 60 via bolts 5, which are lag screw bolts or coach screw bolts. This allows stress to be transmitted by the bolts 5, and the deck slab 60 and CLT panel 30 can withstand long-term loads. As a result, the slab thickness of the RC slab 50 can be reduced compared to a configuration without CLT panel 30. In this embodiment of the composite slab structure 100, fire resistance is improved and the slab thickness can be reduced, thus eliminating the need to provide fire-resistant reinforcement bars. For example, in a conventional structure, it is necessary to provide fire-resistant reinforcement bars on the valleys 24 of the deck plate 20, whereas in the composite slab structure 100, fire resistance can be met without providing fire-resistant reinforcement bars.

[0052] In the composite slab structure 100, the deck slab 60 and the CLT panel 30 can be joined with high strength using lag screw bolts or coach screw bolts.

[0053] In the composite slab structure 100, even if the CLT panel 30 is heated during a fire and heat is transferred to the deck slab 60 via the bolts 5, the impact on the compression edge of the concrete 40 that bears the compressive load is minimal.

[0054] Furthermore, with the composite slab structure 100, the underside of the deck slab 60 is covered by the CLT panel 30, so the ceiling formed by the deck slab 60 can be left as exposed wood.

[0055] Furthermore, with the composite slab structure 100, the shear strength is high because the wood surface material is CLT panel 30, and the workability is also improved because the widest possible width of the wood surface material can be used.

[0056] Furthermore, in the composite slab structure 100, the ends of multiple CLT panels 30 extending in a direction intersecting the longitudinal direction of the main beams 10A and 10B are placed on the upper surfaces of the main beams 10A and 10B at intervals from each other. Concrete 40 is poured in the spaces between the main beams 10A and 10B, integrating the RC slab 50 with the main beams 10A and 10B. With this configuration of the composite slab structure 100, the RC slab 50 can be firmly supported by the main beams 10A and 10B.

[0057] Furthermore, in the composite slab structure 100, studs 8 embedded in the concrete 40 are provided in the gaps above the main beams 10A and 10B. With this configuration of the composite slab structure 100, the RC slab 50 and the main beams 10A and 10B are integrated even more firmly, and the RC slab 50 can be supported by the main beams 10A and 10B.

[0058] [Bolts and reinforcing members of a composite slab structure according to a modified example] Next, with reference to Figure 4, the bolts 5 and reinforcing members 70 of the modified composite slab structure will be described. Figure 4 is an enlarged cross-sectional view showing the bolts and reinforcing members of the modified composite slab structure.

[0059] As shown in Figure 4, cylindrical reinforcing members 70 are provided in the valleys 24 of the deck plate 20 to reinforce the area around the bolt holes 6. The cylindrical reinforcing members 70 are positioned corresponding to the bolt holes 6 and are fixed to the bottom plate 27 of the deck plate 20. The reinforcing members 70 are, for example, welded to the bottom plate 27. The cylindrical reinforcing members 70 are positioned to protrude upward from the bottom plate 27.

[0060] The bolt 5 is inserted through the cylindrical reinforcing member 70 and the bolt hole 6, and protrudes above the reinforcing member 70. The portion of the bolt 5 that protrudes above the reinforcing member 70 is embedded in the concrete 40. The bolt 5 is positioned, for example, so as to be in contact with the inner circumferential surface of the cylindrical reinforcing member 70 and is held in place by the reinforcing member 70. The upper end of the bolt 5 may be positioned, for example, above the ridge 22 of the deck plate 20.

[0061] The inner circumferential surface of the cylindrical reinforcing member 70 may have a female thread formed thereon for screwing onto the bolt 5. The cylindrical reinforcing member 70 may also be, for example, a nut.

[0062] In this modified composite slab structure, the portion of the bolt 5 protruding from the reinforcing member 70 is embedded in the RC slab 50, thereby integrating the concrete 40, deck plate 20, and CLT panel 30. Furthermore, since the reinforcing member 70 is fixed around the bolt hole 6, the opening of the bolt hole 6 can be reinforced by the reinforcing member 70.

[0063] [Composite slab structure according to the second embodiment] Next, with reference to Figure 5, a composite slab structure 100 according to the second embodiment will be described. Figure 5 is a cross-sectional view showing an example of a composite slab structure according to the second embodiment. The difference between the composite slab structure 100 according to the second embodiment and the composite slab structure 100 according to the first embodiment is that sound-absorbing material 90 is placed in the space between the ridge portion 22 of the deck plate 20 and the CLT panel 30. As the sound-absorbing material 90, for example, glass wool, rock wool, or foamed resin can be used. A gap is created between the sound-absorbing material 90 and the top plate 26 and inclined plates 28, 29 of the deck plate 20. The sound-absorbing material 90 may be embedded in a part of the space between the ridge portion 22 of the deck plate 20 and the CLT panel 30, or it may be embedded in the entire space between the ridge portion 22 and the CLT panel 30.

[0064] In this second embodiment, a gap exists between the CLT panel 30 and the ridge portion 22 of the deck plate 20 in the composite slab structure 100, and an air layer is formed in this gap. Since this air layer provides thermal insulation, heat transfer from the CLT panel 30 to the deck slab 60 is suppressed in the event of a fire, and damage to the deck slab 60 can be reduced. As a result, the fire resistance performance of the composite slab structure 100 can be improved.

[0065] Furthermore, according to the composite slab structure 100 of the second embodiment, sound-absorbing material 90 is provided between the ridge portion 22 of the deck plate 20 and the CLT panel 30, thereby reducing the transmission of sound from the upper floor to the lower floor and from the lower floor to the upper floor.

[0066] [Construction method for the composite slab structure according to the third embodiment] Next, a construction method for the composite slab structure 100 according to the third embodiment will be described. Figure 6 is a process diagram showing the steps of the construction method for the composite slab structure according to the third embodiment. Here, we will describe the case in which the composite slab structure 100 according to the first embodiment described above is constructed.

[0067] As shown in Figure 6, the construction method for the composite slab structure 100 according to the third embodiment includes the steps of: placing the deck plate 20 on the CLT panel 30 (step S11); joining the deck plate 20 and the CLT panel 30 using bolts 5 (step S12); placing the joined deck plate 20 and CLT panel 30 on the main beams 10A and 10B (step S13); and forming the RC slab 50 on the deck plate 20 (step S14).

[0068] First, the deck plate 20 is placed on top of the CLT panel 30 (step S11). Step S11 is performed, for example, in a factory. Step S11 may also be performed at the construction site where the composite slab structure 100 is installed. In step S11, the deck plate 20 is placed on top of the CLT panel 30 such that the bottom plate 27 of the valley portion 24 of the deck plate 20 is in contact with the upper surface of the CLT panel 30. This creates a gap G1 between the peak portion 22 of the deck plate 20 and the CLT panel 30.

[0069] Next, the deck plate 20 and the CLT panel 30 are joined using bolts 5 (step S12). Pre-drilled holes for the bolts 5 are formed in the CLT panel 30. Bolt holes 6 are also formed in the deck plate 20 at positions corresponding to the pre-drilled holes in the CLT panel 30. In step S12, the bolts 5 are inserted through the bolt holes 6 to join the deck plate 20 and the CLT panel 30. The bolts 5 are fixed to the CLT panel 30 and the deck plate 20. Step S12, like step S11, may be performed in a factory or on-site.

[0070] Next, the joined deck plate 20 and CLT panel 30 are placed on the main beams 10A and 10B (step S14). For example, heavy machinery is used to lift the deck plate 20 and CLT panel 30 and place them on the main beams 10A and 10B. The ends of the CLT panel 30 are placed on the upper flanges 12 of the main beams 10A and 10B. The deck plate 20 is located on top of the CLT panel 30.

[0071] Next, an RC slab 50 is formed on the deck plate 20 (step S14). In step S14, reinforcing bars 120 and 150 are placed on the deck plate 20, and concrete 40 is poured to form the RC slab 50. After pouring the concrete 40, concrete 40 is poured as needed.

[0072] The above-mentioned composite slab structure 100 is constructed by performing the construction method for the composite slab structure 100 described above.

[0073] According to the composite slab structure 100 of this embodiment, by joining the CLT panel 30 and the deck plate 20 before placing the CLT panel 30 on the main beams 10A and 10B, it is possible to eliminate the need to place the CLT panel 30 and the deck plate 20 separately on the main beams 10A and 10B. As a result, construction time at the construction site can be reduced.

[0074] Furthermore, with this composite slab structure 100, the CLT panels 30 and the deck plates 20 can be joined using bolts 5 before the CLT panels 30 are placed on the main beams 10A and 10B, thereby reducing the amount of work that workers have to do at heights.

[0075] [Construction method for the composite slab structure according to the fourth embodiment] Next, the construction method of the composite slab structure according to the fourth embodiment will be described. Figure 7 is a process diagram showing the procedure for the construction method of the composite slab structure according to the fourth embodiment. The difference between the construction method of the composite slab structure according to the fourth embodiment and the construction method of the composite slab structure according to the third embodiment is that the deck plate 20 is placed after the CLT panel 30 is placed on the main beams 10A and 10B. In the description of the fourth embodiment, explanations that are the same as those given in the description of the third embodiment will be omitted.

[0076] As shown in Figure 7, the construction method for the composite slab structure 100 according to the fourth embodiment includes the steps of: placing the CLT panel 30 on the main beams 10A and 10B (step S21); placing the deck plate 20 on the CLT panel 30 (step S22); joining the deck plate 20 and the CLT panel 30 using bolts 5 (step S12); and forming the RC slab 50 on the deck plate 20 (step S14). These steps are carried out in the order of steps S21, S22, S12, and S14. The composite slab structure 100 may be constructed by performing each step in this order.

[0077] According to the composite slab structure 100 of this embodiment, by joining the CLT panel 30 and the deck plate 20 before placing the CLT panel 30 on the main beams 10A and 10B, it is possible to eliminate the need to place the CLT panel 30 and the deck plate 20 separately on the main beams 10A and 10B. As a result, construction time at the construction site can be reduced.

[0078] According to the construction method of the composite slab structure of this embodiment, after placing the CLT panels 30 on the main beams 10A and 10B, the deck plates 20 are placed on top of the CLT panels 30 that are on the main beams 10A and 10B. This allows the CLT panels 30 and deck plates 20 to be placed separately on the main beams 10A and 10B. When lifting the CLT panels 30 and deck plates 20 onto the main beams 10A and 10B, the CLT panels 30 and deck plates 20 can be lifted separately, thus reducing the weight of the members that need to be lifted at once.

[0079] 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. [Explanation of Symbols]

[0080] 100: Composite slab structure 2: Pillar 5: Bolts (rod-shaped fixing members, lag screw bolts, coach screw bolts) 6: Bolt holes 8: Stud 10,10A,10B: Large beam (beam) 11: Web 12: Upper flange 13: Lower flange 20: Deck Plate 22: Yamabe 24: Tanibe 26: Top plate 27: Bottom plate 28,29: Inclined plate 30: CLT panel (wood-based paneling) 32,34,36: layer 50: Reinforced concrete slab 60: Deck Slab 70: Reinforcement member (nut) 80: Fire-resistant coating 90: Sound-absorbing material 120: Reinforcement bars 150: Reinforcement bars G1: Gap X:X-axis direction Y: Y axis Z: Z-axis direction

Claims

1. A deck slab is formed by a deck plate having alternating peaks and valleys, and a reinforced concrete slab placed on top of the deck plate, A composite slab is formed by a wooden surface material located below the aforementioned deck plate and joined to the deck plate via a rod-shaped fixing member, A gap is formed between the ridge portion of the deck plate and the wood surface material. The aforementioned wooden panel is supported by the beam, The aforementioned rod-shaped fixing member is a bolt. A hole is formed in the valley portion of the deck plate through which the bolt is inserted. The bolt protrudes on the side opposite to the deck plate, The protruding portion of the bolt is embedded in the reinforced concrete slab. The composite slab structure described above, characterized in that the bolt is a lag screw bolt or a coach screw bolt.

2. A cylindrical reinforcing member is fixed to the upper surface of the valley portion at a position corresponding to the hole, to reinforce the area around the hole. The bolt is inserted through the cylindrical reinforcing member and protrudes from the cylindrical reinforcing member on the side opposite to the deck plate. The composite slab structure according to claim 1, characterized in that the reinforcing member and the portion of the bolt protruding from the reinforcing member are embedded in the reinforced concrete slab.

3. A deck slab formed by a deck plate having alternating peaks and valleys, and a reinforced concrete slab on the deck plate, A composite slab is formed by a wooden surface material located below the aforementioned deck plate and joined to the deck plate via a rod-shaped fixing member, A gap is formed between the ridge portion of the deck plate and the wood surface material. The aforementioned wooden panel is supported by the beam, On the upper surface of the beam, the ends of a plurality of the wooden panel members extending in a direction intersecting the longitudinal direction of the beam are placed at intervals from each other. A composite slab structure characterized in that concrete is poured in the gap above the beam, thereby integrating the reinforced concrete slab and the beam.

4. The aforementioned rod-shaped fixing member is a bolt. A hole is formed in the valley portion of the deck plate through which the bolt is inserted. A cylindrical reinforcing member is fixed to the upper surface of the valley portion at a position corresponding to the hole, to reinforce the area around the hole. The bolt is inserted through the cylindrical reinforcing member and protrudes from the cylindrical reinforcing member on the side opposite to the deck plate. The composite slab structure according to claim 3, characterized in that the reinforcing member and the portion of the bolt protruding from the reinforcing member are embedded in the reinforced concrete slab.

5. The composite slab structure according to claim 4, characterized in that the bolt is a lag screw bolt or a coach screw bolt.

6. The composite slab structure according to any one of claims 3 to 5, characterized in that studs embedded in the concrete are provided in the gaps above the beam.

7. The composite slab structure according to any one of claims 1 to 6, characterized in that the wood surface material is a CLT panel.

8. The composite slab structure according to any one of claims 1 to 7, characterized in that sound-absorbing material is provided in part or all of the gap.

9. The process involves placing the wooden panel on top of the beam, The process involves placing the deck plate on the wood surface material such that the valleys of the deck plate, which has alternating peaks and valleys, are brought into contact with the wood surface material, and a gap is formed between the peaks and the wood surface material. A step of joining the deck plate and the wood surface material using a rod-shaped fixing member, A method for constructing a composite slab structure, characterized by comprising the step of forming a reinforced concrete slab on the deck plate.

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