Composite floor and joint structure of composite floor and beam

Abstract

To provide a composite floor having a wooden face material and a concrete floor slab arranged on a wide face above the wooden face material, which can suppress falling and peeling of the wooden face material from the concrete floor slab, and a joint structure of the composite floor and a beam, which is excellent in fire resistance performance.SOLUTION: A composite floor 50 includes a wooden face material 10 and a concrete floor slab 20 disposed on an upper wide face 11 of a pair of wide faces 11, 12 of the wooden face material 10, a joint metal 30 having an extension part 32 extending to the outside of the upper wide face 11 is attached to an end part 13 of the wooden face material 10, and at least the extension part 32 of the joint metal 30 is buried in the concrete floor slab 20.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a composite floor and a joint structure between a composite floor and a beam. [Background technology]

[0002] Amid the recent growing demand for reducing environmental impact and active efforts to be environmentally conscious, the construction industry has been actively developing technologies that make effective use of wood, and in wooden buildings and hybrid buildings made of wood, steel, or concrete, various structural components such as beams, columns, walls, and floors are made of wood. Wood is lighter than steel frames or concrete, has a high specific strength, is easy to process, has high thermal insulation properties, has moisture-regulating properties, and has the appearance design that comes from natural materials. As a natural material, it produces less carbon dioxide emissions and is highly effective in reducing environmental impact. It is a material that offers a variety of benefits.

[0003] When we look at the floors of buildings such as apartment buildings, when floors are constructed using only wood such as wood surface materials, composite floors made by laminating wood surface materials and concrete floor slabs may be installed in order to improve or enhance performance that is an issue with wood, such as sound insulation and fire resistance.

[0004] Patent Document 1 proposes a load-bearing board member. This load-bearing board member includes wood layers laminated so that the fiber direction of the wood fibers crosses each other in each layer, and a concrete or mortar layer bonded to one surface of the wood layer, and is provided with stress transmission means for transmitting stress between the wood layer and the concrete or mortar layer, and examples of the stress transmission means include cotters that protrude downward from the underside of the concrete or mortar layer and engage with recesses in the wood layer, or lag screws that are fixed to the wood layer and embedded in the concrete layer. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2017-78307 Summary of the Invention [Problem to be solved by the invention]

[0006] The load-bearing plate members described in Patent Document 1 have a structure in which cotters on the underside of the concrete or mortar layer engage with recesses in the wood layer, and vertically extending lag screws fixed to the wood layer are embedded in the concrete or mortar layer.While this improves the transmission performance of shear forces acting on these members, it raises concerns that the lower wood layer may fall or peel off from the upper concrete or mortar layer.

[0007] The present invention has been made in consideration of the above-mentioned problems, and relates to a composite floor having a wooden surface material and a concrete floor slab arranged on a wide surface above the wooden surface material.The present invention aims to provide a composite floor that can prevent the wooden surface material from falling or peeling off from the concrete floor slab, and a joint structure between the composite floor and beams that has excellent fire resistance. [Means for solving the problem]

[0008] In order to achieve the above object, one aspect of the synthetic bed according to the present invention is: A composite floor having a wood surface material and a concrete floor slab disposed on the upper wide surface of a pair of wide surfaces of the wood surface material, A metal joint having an extension extending outward from the upper wide surface, or a metal joint having an extension extending outward from the upper wide surface after protruding above the upper wide surface, is attached to the end of the wooden surface material, The joint is characterized in that at least the extension portion of the metal joint is embedded in the concrete slab.

[0009] According to this aspect, a connecting metal fitting having an extension portion extending outward from the upper wide surface, or a connecting metal fitting having an extension portion that protrudes above the upper wide surface and then extends outward or inward from the wide surface, is attached to the end of the wood surface material, and at least the extension portion of the connecting metal fitting is embedded in the concrete floor slab, thereby preventing the wood surface material from falling or peeling off from the concrete floor slab.

[0010] Here, "a metal joint having an extension extending outward from the upper wide surface" means, for example, that a plate-shaped metal joint is attached to the end of the upper wide surface, with the extension of the metal joint protruding outward from the wooden panel. On the other hand, "a metal joint having an extension that protrudes upward from the upper wide surface and then extends outward or inward from the wide surface" refers to a metal joint attached to the end face or upper wide surface of the wooden panel, and then the extension that is formed by bending extends inward from the wooden panel, or extends outward from the wooden panel. In this way, the extension of the metal joint extends in the direction in which the wooden panel expands (e.g., parallel to the wide surface of the wooden panel), so that the extension embedded in the concrete slab acts as a catch, helping to prevent the wooden panel from falling or peeling off from the concrete slab.

[0011] Examples of joining metals include flat steel (steel plate), angle steel, L-shaped steel, Z-shaped steel, and steel materials of these shapes cut out and cast.

[0012] Another aspect of the synthetic floor according to the present invention is The metal joint is fastened to the upper wide surface via a connector.

[0013] According to this aspect, the connecting metal is fastened to the upper wide surface via a connector, so that the end of the wood panel and the connecting metal can be firmly joined with easy fastening.

[0014] The connectors may be wood screws, nails, bolts, etc.

[0015] Another aspect of the synthetic floor according to the present invention is The connecting metal fitting is fastened to the end face of the wooden surface material via a connector.

[0016] According to this aspect, the connecting metal is fastened to the end face of the wooden panel via a fastener, so that the end of the wooden panel and the connecting metal can be firmly joined with easy fastening.

[0017] Another aspect of the synthetic floor according to the present invention is A first recess is provided on the end surface of the wooden panel, and a part of the metal joint is fitted into the first recess and fastened via a connector.

[0018] According to this aspect, a portion of the connecting metal fitting is fitted into the first recess provided on the end face of the wooden panel and fastened via a connector, thereby enabling easy fastening and firmly joining of the two parts in a flush manner, for example, without the connecting metal fitting protruding from the end face of the wooden panel.

[0019] Another aspect of the synthetic floor according to the present invention is A slit is provided on the end surface of the wooden panel, a part of the connecting metal is fitted into the slit, and a connector driven from the wide surface of the wooden panel passes through a connector hole provided in the fitting portion of the connecting metal, and the fitting portion is fastened.

[0020] According to this embodiment, a portion of the connecting metal piece fits into a slit provided on the end face of the wooden panel, and the connector driven from the wide face of the wooden panel passes through a connector hole provided in the fitting portion of the connecting metal piece to fasten the fitting portion, thereby enabling the end of the wooden panel to be firmly joined to the connecting metal piece with easy fastening properties.

[0021] Another aspect of the synthetic floor according to the present invention is The metal joint is characterized in that a sharpened portion is provided at one end thereof, and the sharpened portion is driven into the end face of the wooden surface material.

[0022] According to this aspect, the sharp tip provided at one end of the connecting metal fitting is driven into the end face of the wooden surface material, thereby enabling the end of the wooden surface material and the connecting metal fitting to be firmly joined with easy fastening.

[0023] Another aspect of the synthetic floor according to the present invention is A second recess is provided on the upper wide surface of the wooden panel, and a portion of the concrete floor slab is recessed into the second recess.

[0024] According to this aspect, a portion of the concrete floor slab is recessed into the second recess provided on the upper wide surface of the wooden surface material, so that in addition to integrating the two using the connecting metal fittings, a portion of the concrete floor slab acts as a shear key, making it possible to integrate the two more firmly.

[0025] In addition, one aspect of the joint structure between a composite floor and a beam according to the present invention is as follows: The wooden surface material is inserted into a receiving groove below the concrete floor slab, The ends of the concrete floor slabs of the composite floor on the left and right sides are placed on the top surface of the beam with a gap between them, Floor reinforcement bars extend from the end of the concrete floor slab, The floor reinforcements extending from the ends of the concrete floor slabs forming the left and right composite floors are lapped and welded together, or are connected to each other via short connecting bars; A shaft member is erected upward from the upper surface of the beam, A filler material is formed in the gap.

[0026] According to this embodiment, the ends of the concrete slabs of the two composite floors of the present invention are placed above the beam with a gap between them, and the floor reinforcement bars extending from both concrete slabs into the gap are joined directly or indirectly via connecting bars.The gap is blocked by filler material, which encases the axial member erected upward from the top surface of the beam and the floor reinforcement bars that are joined to each other.This prevents the concrete slabs from falling off the beam even if the wooden surface material is burned during a fire, and forms a joint structure with excellent fire resistance.

[0027] Here, the beam may be a wooden beam, a steel beam made of shaped steel (H-shaped steel, channel steel, angle steel, etc.) or square steel pipe, or a concrete beam (RC (Reinforced Concrete) beam). In the case of a wooden beam, an axial member such as a screw or lag screw bolt is joined to the top surface, in the case of a steel beam, an axial member such as a stud dowel is joined to the top surface, and in the case of a concrete beam, an axial member made of reinforcing steel or the like protrudes from the top surface.

[0028] Another aspect of the joint structure between a composite floor and a beam according to the present invention is as follows: The wooden surface material is inserted into a receiving groove below the concrete floor slab, The ends of the concrete floor slabs of the composite floor on the left and right are placed on the top surfaces of the two beams on the left and right that are spaced apart, with a gap between them. The boards are placed across the top of the two adjacent beams on the left and right. Floor reinforcement bars extend from the end of the concrete floor slab, The floor reinforcements extending from the ends of the concrete floor slabs forming the left and right composite floors are lapped and welded together, or are connected to each other via short connecting bars; A shaft member is erected upward from the upper surface of the beam, A filler material is formed in the gap.

[0029] According to this embodiment, the ends of the concrete floor slabs of the two composite floors of the present invention are placed on the top surfaces of two beams (joint beams) arranged side by side at a distance from each other, with a gap between them, and the floor reinforcement bars extending into the gap from both concrete floor slabs are joined directly or indirectly via connecting bars, and the gap is blocked by filler material, which encases the axial member erected upward from the top surface of the beam and the floor reinforcement bars that are joined to each other.This prevents the concrete floor slabs from falling off the beams even if the wooden surface material is burned during a fire, and forms a joint structure with excellent fire resistance. [Effects of the Invention]

[0030] As can be understood from the above explanation, the composite floor and the joint structure between the composite floor and the beam of the present invention, for a composite floor having a wooden surface material and a concrete floor slab arranged on the wide surface above the wooden surface material, can prevent the wooden surface material from falling or peeling off from the concrete floor slab, and can provide a joint structure between the composite floor and the beam with excellent fire resistance. [Brief explanation of the drawings]

[0031] [Figure 1] FIG. 1 is a perspective view of an example of a composite floor according to an embodiment, showing a portion of the concrete floor slab broken away. [Figure 2] FIG. 10 is a perspective view of another example of a composite floor according to an embodiment, showing a portion of the concrete floor slab cut away. [Figure 3] FIG. 10 is a perspective view of yet another example of a composite floor according to an embodiment, showing a portion of the concrete floor slab cut away. [Figure 4A] FIG. 10 is a perspective view showing another example of a mounting configuration of a metal joint to a wooden surface material. [Figure 4B] FIG. 10 is a perspective view showing yet another example of the mounting configuration of a metal joint to a wooden surface material. [Figure 4C] FIG. 10 is a perspective view showing yet another example of the mounting configuration of a metal joint to a wooden surface material. [Figure 5A]This is an oblique view of an example of a joint structure between a composite floor and a beam in an embodiment, showing a portion of the left and right concrete floor slabs broken away, and showing the state in which the gap between the left and right composite floors is blocked partway with filler material. [Figure 5B] This is an oblique view of another example of the joint structure between a composite floor and a beam according to an embodiment, showing a portion of the left and right concrete floor slabs broken away, and showing the state in which the gap between the left and right composite floors is partially blocked by filler material. DETAILED DESCRIPTION OF THE INVENTION

[0032] The composite floor and the joint structure between the composite floor and the beam according to the embodiment will be described below with reference to the accompanying drawings. Note that in this specification and the drawings, substantially identical components will be designated by the same reference numerals to avoid redundant description.

[0033] [Synthetic floor according to the embodiment] First, an example of a composite floor according to an embodiment will be described with reference to Figures 1 to 4. Here, Figures 1 to 3 are perspective views of an example of a composite floor according to an embodiment, showing a portion of a concrete floor slab cut away. Also, Figures 4A to 4C are perspective views showing other examples of attachment forms of metal joints to wooden surface materials.

[0034] The composite floor 50 shown in Figure 1 has a wooden panel 10 and a concrete floor slab 20 placed on the upper wide surface 11 of a pair of wide surfaces 11, 12 of the wooden panel 10. The concrete floor slab 20 has floor reinforcement bars 25 inside that intersect with each other.

[0035] The wooden surface material 10 in the illustrated example is made of CLT, but the wooden surface material may also be made of other materials such as LVL (Laminated Veneer Lumber) or solid wood.

[0036] In the composite floor 50, the wood surface material 10 fits into the accommodation groove 21 below the concrete slab 20, and therefore the end 22 of the concrete slab 20 is present on the side of the wood surface material 10. This end 22 of the concrete slab 20 is the area that will be placed on the beams 60, 70 in the composite floor and beam joint structures 90, 90A (see Figures 5A and 5B) described below. Because the wood surface material 10 is not placed directly on the beams 60, 70, even if the wood surface material 10 is burned during a fire, the beams 60, 70 are covered with the fire-resistant coatings 68, 78 and the concrete slab 20A (a modified version of the concrete slab 20), and there are no gaps through which the flames can directly circulate. This prevents the wood beams 70 from being burned and the strength of the steel beams 60 from being reduced due to high temperatures, which in turn helps prevent the beams 60, 70 from collapsing.

[0037] Of the wooden surface material 10, which is rectangular when viewed from above, a connecting metal fitting 30 having an extension portion 32 extending outward (toward the end 22 of the concrete floor slab 20) is attached to the wide surface 11 above the end 13 on the end 22 side of the concrete floor slab 20 via a connecting device 40.

[0038] The connecting hardware 30 in the illustrated example is formed from steel plate, and has multiple (three in the illustrated example) holes 31 for fasteners (see Figure 4A), and by hammering fasteners 40 through each of the holes 31 for fasteners, the connecting hardware 30 is joined to the wide surface 11 of the end 13 of the wooden panel 10.

[0039] Here, the metal joint 30 may be made of steel plate or stainless steel, may be plated or painted, or may be a cast member. Wood screws, nails, lag screws, coach bolts, coach screws, etc. are used as the connectors 40. If the metal joint 30 can be firmly joined to the wood panel 10 with an adhesive, the adhesive may be used instead of a connector.

[0040] By embedding the extension portion 32 of the connecting metal fitting 30, which is parallel or approximately parallel to the direction of extension of the wide surface 11 of the wooden surface material 10, in the end portion 22 of the concrete floor slab 20, not only is the wooden surface material 10 and the concrete floor slab 20 integrated by the connecting metal fitting 30, but the extension portion 32 also acts as a catch, preventing the wooden surface material 10 from falling or peeling off from the concrete floor slab 20.

[0041] In particular, when the composite floor 50 bends due to the load, peeling between the wood surface material 10 and the concrete floor slab 20 is likely to occur at the ends of the composite floor 50 supported by beams, etc., but by using multiple connecting metal fittings 30 to join the wood surface material 10 to the concrete floor slab 20 at the ends 13 of the wood surface material 10, peeling between the two is effectively suppressed.

[0042] The composite floor 50A shown in Figure 2 differs from the composite floor 50 in that the upper wide surface 11 of the wooden surface material 10A is provided with multiple second recesses 17 (recesses), and a portion of the concrete floor slab 20A (protrusion 27 (recesses)) extends into the second recesses 17 of the wooden surface material 10A.

[0043] According to the composite floor 50A, a portion of the concrete floor slab 20A (convex portion 27) fits into the second recess 17 provided on the upper wide surface 11 of the wood surface material 10A, so that in addition to integrating the two using the connecting metal fittings 30, the convex portion 27 of the concrete floor slab 20A acts as a shear key, making it possible to integrate the two more firmly.

[0044] In the composite floor 50A, the extensions 32 of the metal joints 30 also act as catches, preventing the wooden surface material 10A from falling off or peeling off from the concrete floor slab 20A.

[0045] The composite floor 50B shown in Figure 3 differs from the composite floor 50A in that a first recess 18 is provided on the other end face 16 of the wood panel 10B, and a portion of an L-shaped connecting metal fitting 30A is fitted into the first recess 18 and fastened to the first recess 18 via a connecting fixture 40.

[0046] By joining the two pieces in a manner in which a portion of the L-shaped connecting metal piece 30A is fitted into the first recess 18, the portion of the L-shaped connecting metal piece 30A and the end face 16 of the wooden surface material 10B can be positioned flush, for example, without having the portion of the L-shaped connecting metal piece 30A protrude to the side of the end face 16 of the wooden surface material 10B, resulting in a good external design.

[0047] Here, in the illustrated example of the composite floor 50B, the concrete floor slab 20B does not have a storage groove for storing the wood surface material 10B, but it may have a storage groove like the composite floors 50 and 50A.

[0048] In addition, in the illustrated example, a portion of the L-shaped connecting metal piece 30A is fitted into the first recess 18 to join the two together, but a portion of the L-shaped connecting metal piece 30A may also be joined to an end face 16 that does not have a first recess 18.

[0049] The L-shaped connecting metal fitting 30A has an extension 34 that bends from the piece that is housed in the first recess 18 and joined, and extends inward above the wide surface 11 of the wooden surface material 10B. By embedding this extension 34 inside the concrete floor slab 20B, the extension 34 acts as a catch, preventing the wooden surface material 10B from falling or peeling off from the concrete floor slab 20B.

[0050] Next, with reference to FIGS. 4A to 4C, perspective views are shown showing other examples of mounting methods of metal joints to wooden surface materials.

[0051] In the example shown in Figure 4A, a slit 19 is provided on the end face 15 of the wooden surface material 10, the fitting portion 35 of the flat connecting metal piece 30B fits into the slit 19 in the X1 direction, and a connector 40 is driven into the wide face 11 of the wooden surface material 10 in the X2 direction and passes through the connector hole 31 provided in the fitting portion 35, so that the extension portion 36 of the connecting metal piece 30B extends outside the end face 15 of the wooden surface material 10, thereby attaching the wooden surface material 10 and the connecting metal piece 30B.

[0052] On the other hand, in the example shown in Figure 4B, a slit 19 is provided on the end face 15 of the wooden surface material 10, and the fitting portion 35 of the connecting hardware 30C made of Z-shaped steel fits into the slit 19 in the X3 direction, and a connector 40 is driven into the wide face 11 of the wooden surface material 10 in the X4 direction and passes through the fitting hole 31 for the connector provided in the fitting portion 35, so that the extension portion 37 of the connecting hardware 30C extends outside the end face 15 of the wooden surface material 10, and the wooden surface material 10 and the connecting hardware 30C are attached in this manner.

[0053] On the other hand, in the example shown in Figure 4C, one piece of the U-shaped connecting hardware 30D is a sharpened portion 39, and the sharpened portion 39 is driven into the end face 15 of the wooden surface material 10 in the X5 direction, so that the extension portion 38 of the connecting hardware 30D extends inside the end face 15 of the wooden surface material 10, and the wooden surface material 10 and the connecting hardware 30D are attached to each other.

[0054] As described above, the shapes and configurations of the applicable metal joints 30B, 30C, and 30D vary, and the manner in which the metal joints 30B, 30C, and 30D are attached to the wooden surface material 10 also varies. In any configuration, the metal joints 30B, 30C, and 30D attached to the wooden surface material 10 have extensions 36, 37, and 38 that extend outward or inward from the end face 15 of the wooden surface material 10, and the extensions 36, 37, and 38 act as catches to prevent the wooden surface material 10 from falling or peeling off from the concrete floor slab.

[0055] [Joint structure between composite floor and beam according to the embodiment] Next, an example of a joint structure between a composite floor and a beam according to an embodiment will be described with reference to Figures 5A and 5B. Figures 5A and 5B are perspective views of an example of a joint structure between a composite floor and a beam according to an embodiment, each showing a state in which parts of the left and right concrete floor slabs are broken away and the gap between the left and right composite floors is partially blocked with filler material.

[0056] The joint structure 90 shown in Figure 5A is formed by placing the ends 22 of the concrete floor slabs 20A of the composite floor 50A on the left and right sides on the top surface of the steel beam 60 with a gap G between them, and filling the gap G with a filler material 80 such as concrete or mortar.

[0057] The steel beam 60 in the illustrated example is made of an H-shaped steel beam having a web 61, an upper flange 62, and a lower flange 63, around which a fire-resistant coating 68 is formed, and the lower end of a stud dowel 65 (an example of an axial member) is joined to the upper surface of the upper flange 62.

[0058] Here, the beam 60 in the illustrated example is a steel beam made of H-shaped steel, but it may also be a steel beam made of shaped steel materials other than H-shaped steel, such as channel steel, or square steel pipes, or it may also be a wooden beam or a concrete beam (reinforced concrete beam).

[0059] Floor reinforcement bars 25 protrude from the end 22 of the concrete floor slab 20A of the composite floor 50A, the end 22 of which rests on the upper surface of the upper flange 62, and connecting bars 28 lap over the floor reinforcement bars 25 of the left and right composite floors 50A, and the floor reinforcement bars 25 and connecting bars 28 are joined by flare welding or the like. Here, the floor reinforcement bars 25 on both sides may lap directly together and be welded together without using connecting bars 28.

[0060] In addition, if linear floor reinforcement cannot ensure the specified anchorage length inside the concrete floor slab 20A, L-shaped reinforcement 25A is applied as shown in the example shown to ensure the specified anchorage length inside the concrete floor slab 20A.

[0061] Furthermore, in the illustrated example, cotters 24 are provided at the ends of the left and right composite flooring 50A, and the cotters 24 are filled with filler material 80, which increases the bonding strength between the filler material 80 and the left and right composite flooring 50A. Here, if sufficient bonding strength can be ensured between the filler material 80 and the composite flooring 50A without the cotters 24, the cotters 24 may be unnecessary.

[0062] By filling the gap G with the filler material 80, the gap G is closed by the filler material 80 while enveloping the stud dowels 65 erected upward from the top surface of the steel beams 60 and the floor reinforcement bars 25 that are joined to each other, and a joint structure 90 is formed.

[0063] According to the joint structure 90, the ends 22 of the concrete floor slabs 20A that make up the left and right composite floors 50A are placed on the upper surfaces of the steel beams 60. This means that even if the wooden surface material 10A is burned during a fire, the steel beams 60 are covered with the fire-resistant coating 68 and the concrete floor slabs 20A, and there are no gaps through which the flames can directly circulate. This prevents the strength of the steel beams 60 from decreasing due to high temperatures, and ensures that the steel beams 60 will not collapse, forming a joint structure 90 with excellent fire resistance.

[0064] On the other hand, a joint structure 90A shown in FIG. 5B differs from the joint structure 90 in that, instead of the steel beam 60, a laminated wooden beam 70A made of two wooden beams 70 with fire-resistant coating 78 around them is used.

[0065] In the joint structure 90A, the ends 22 of the concrete floor slabs 20A of the left and right composite floors 50A are placed on the left and right wooden beams 70. Note that the illustrated example has a laminated wooden beam 70A, but it may also be a laminated beam made of two steel beams, a laminated beam made of two concrete beams, or the like.

[0066] In addition, boards 76 are placed across the upper surfaces of the left and right wooden beams 70, and function as a lower formwork when filling material 80 is poured.

[0067] An end of a lag screw bolt 75 is driven into the upper surface of each wooden beam 70, and the lag screw bolt 75 protrudes into the gap G. Furthermore, a plurality of gap reinforcements 29 are arranged in the gap G.

[0068] By filling the gap G with the filler material 80, the gap G is closed by the filler material 80 while enveloping the lag screw bolts 75 erected upward from the top surface of each wooden beam 70 that constitutes the laminated wooden beam 70A, the floor reinforcement 25 that are joined to each other, and the gap reinforcement 29, thereby forming a joint structure 90A.

[0069] With the joint structure 90A, the ends 22 of the concrete floor slabs 20A that make up the left and right composite floors 50A are placed on the top surfaces of the laminated wooden beams 70A, so that even if the wooden surface material 10A is burned during a fire, the wooden beams 70 are covered with the fire-resistant coating 78 and the concrete floor slabs 20A, and there are no gaps through which the flames can directly circulate. This prevents the wooden beams 70 from burning and guarantees that the wooden beams 70 will not collapse, forming a joint structure 90A with excellent fire resistance.

[0070] The present invention is not limited to the configurations shown here, and other embodiments may be possible in which other components are combined with the configurations described in the above embodiments. In this regard, the present invention can be modified within the scope of the present invention, and can be appropriately determined depending on the application form. [Explanation of symbols]

[0071] 10, 10A, 10B: Wood surface material 11: Upper broad surface (wide surface) 12: Lower broad surface (wide surface) 13,14:End 15,16: End face 17: Second recess 18: First recess 19: Slit 20, 20A, 20B: Concrete floor slab 21: Storage groove 24: Cotter 25: Floor line 25A: L muscle 27: Convex 28: Connecting muscle 29: Gap groove 30, 30A, 30B, 30C, 30D: Metal joints 31: Hole for connector 32,34,36,37,38: Extension part 35: Fitting part 39: Sharp part 40: Connector (wood screw) 50,50A,50B:Synthetic floor 60: Steel beam (beam, H-beam) 61:Web 62: Upper flange 63: Lower flange 65: Stud dowel (shaft component) 68: Fireproof coating 70: Wooden beam (beam) 70A: Laminated wooden beam 75: Lag screw bolt (shaft member) 76: Board material 78: Fireproof coating 80: Filling material 90, 90A: Joint structure of composite floor and beam (joint structure) G: Gap

Claims

1. A composite floor having a wood surface material and a concrete floor slab disposed on the upper wide surface of a pair of wide surfaces of the wood surface material, A metal joint having an extension extending outward from the upper wide surface, or a metal joint having an extension extending outward from the upper wide surface after protruding above the upper wide surface, is attached to the end of the wooden surface material, A composite floor, characterized in that at least the extension portion of the metal joint is embedded in the concrete floor slab.

2. 2. The composite floor according to claim 1, wherein the metal connectors are fastened to the upper wide surface via connectors.

3. 2. A composite floor according to claim 1, wherein the metal joints are fastened to the end faces of the wood surface materials via connectors.

4. A composite floor as described in claim 3, characterized in that a first recess is provided on the end surface of the wood surface material, and a part of the connecting metal is fitted into the first recess and fastened via a connecting device.

5. A composite floor as described in claim 1, characterized in that a slit is provided on the end surface of the wooden panel, a part of the connecting metal is fitted into the slit, and a connector driven from the wide surface of the wooden panel passes through a connector hole provided in the fitting portion of the connecting metal to fasten the fitting portion.

6. 2. A composite floor as described in claim 1, characterized in that a sharpened portion is provided at one end of the metal joint, and the sharpened portion is driven into the end face of the wood surface material.

7. 2. A composite floor as described in claim 1, characterized in that a second recess is provided on the upper wide surface of the wood surface material, and a portion of the concrete floor slab is recessed into the second recess.

8. The wooden surface material is inserted into a receiving groove below the concrete floor slab, The ends of the concrete floor slabs of the composite floor according to any one of claims 1 to 7, which are located on the left and right sides of the upper surface of the beam, are placed in a position with a gap between them, Floor reinforcement bars extend from the end of the concrete floor slab, The floor reinforcements extending from the ends of the concrete floor slabs forming the left and right composite floors are lapped and welded together, or are connected to each other via short connecting bars; A shaft member is erected upward from the upper surface of the beam, A joint structure between a composite floor and a beam, characterized in that filler material is formed in the gap.

9. The wooden surface material is inserted into a receiving groove below the concrete floor slab, The ends of the concrete floor slabs of the composite floor according to any one of claims 1 to 7 on the left and right sides are placed with a gap between them on the upper surfaces of the two beams arranged side by side at a distance, The boards are placed across the top of the two adjacent beams on the left and right. Floor reinforcement bars extend from the end of the concrete floor slab, The floor reinforcements extending from the ends of the concrete floor slabs forming the left and right composite floors are lapped and welded together, or are connected to each other via short connecting bars; A shaft member is erected upward from the upper surface of the beam, A joint structure between a composite floor and a beam, characterized in that filler material is formed in the gap.

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