Composite floor, and joint structure and manufacturing method for composite floor

Abstract

To provide a composite floor which is excellent in sound insulation performance, fire protection performance, and connectivity of ceiling equipment, and can suppress deflection caused by secular change, and to provide a joint structure and a manufacturing method of the composite floor.SOLUTION: A composite floor 50 has a wooden face material 20 and a concrete floor slab 10 arranged on a lower wide face 22 of a pair of wide faces 2122, of the wooden face material 20.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to composite floors and to joint structures and methods for fabricating composite floors. [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] Conventional composite floors consisting of wooden surface materials and concrete floor slabs, including the load-bearing board member described in Patent Document 1, have a structure in which concrete is poured on top of the wooden surface materials, resulting in the concrete floor slabs being layered on top of the wooden surface materials.As a result, these composite floors have various inherent issues.

[0007] First, regarding vibration and noise, when residents walk on the relatively hard concrete floor slab, vibration and noise are likely to occur.

[0008] Furthermore, with regard to fire resistance, when the lower wooden panel serves as the ceiling surface (finished surface) of a room on the lower floor (i.e., when a suspended ceiling is not installed), since the ceiling surface is a flammable wooden panel, it becomes necessary to provide a fire-resistant coating or the like on at least the underside of the wooden panel (the underside facing the room) to impart non-flammability, which leads to an increase in production costs.

[0009] Furthermore, with regard to the connectivity of ceiling equipment, various ceiling equipment such as suspended ceilings, lighting equipment, and air conditioning equipment are installed via bolts or the like onto wooden surface materials below, so the installation strength, fire resistance, and weather resistance (collectively referred to as "connectivity") may be significantly reduced compared to when they are installed on a concrete floor slab using bolts or the like.

[0010] Furthermore, regarding deflection due to aging, fully dried wooden panels generally have less drying shrinkage than concrete, so the difference in the amount of drying shrinkage between the wooden panel and the concrete floor slab may cause the wooden panel to deform convexly over time. Also, because there is wooden paneling underneath, the composite floor will deform in a direction that increases deflection, and there is a risk of the floor deflecting more than if there were only a concrete floor slab.

[0011] As such, composite floors in which a concrete floor slab is layered on top of a wooden surface material have issues with vibration and noise, fire resistance, connectivity to ceiling equipment, and distortion due to aging, so a composite floor made of a wooden surface material and a concrete floor slab that can solve these issues is desired.

[0012] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a composite floor that has excellent sound insulation performance, fire prevention performance, and connectivity with ceiling equipment, and that can suppress distortion caused by aging, as well as its joining structure and manufacturing method. [Means for solving the problem]

[0013] In order to achieve the above object, one aspect of the synthetic bed according to the present invention is: The structure is characterized by comprising a wooden panel and a concrete floor slab placed on the lower wide surface of a pair of wide surfaces of the wooden panel.

[0014] According to this embodiment, the structure has a wooden surface material and a concrete floor slab arranged on the wide surface below the wooden surface material, in other words, the wooden surface material is layered on top of the concrete floor slab, so that the soft wooden surface material forms the floor surface, which can suppress vibrations and noise when walking, and the concrete floor slab serves as the ceiling surface for the lower floor, which can improve fire resistance.

[0015] Furthermore, since various ceiling equipment such as suspended ceilings, lighting equipment, air conditioning equipment, piping, and wiring are installed via bolts or the like onto the concrete floor slab below, the installation strength, fire resistance, and weather resistance can be greatly improved compared to when installing them onto wooden surface materials using bolts or the like.

[0016] Furthermore, by arranging the wooden surface material on top, which is relatively less susceptible to warping over time compared to concrete floor slabs, downward warping of the entire composite floor due to changes over time can be minimized.

[0017] Another aspect of the synthetic floor according to the present invention is A first recess is provided on the lower wide surface of the wood surface material, A portion of the concrete forming the concrete floor slab is inserted into the first recess to form a shear key.

[0018] According to this aspect, a portion of the concrete forming the concrete slab fits into the first recess provided on the wider surface below the wooden surface material to form a shear key, thereby forming a composite floor with high shear transfer performance between the concrete slab and the wooden surface material (exhibiting a high composite effect).

[0019] Another aspect of the synthetic floor according to the present invention is A first protrusion protruding downward is provided on the lower wide surface of the wood surface material, The first protrusion is characterized in that it penetrates into the concrete floor slab to form a shear key.

[0020] According to this aspect, the first convex portion, which is provided on the lower wide surface of the wooden surface material and protrudes downward, penetrates into the concrete floor slab to form a shear key, thereby forming a composite floor with high shear transfer performance (high composite effect) and anti-peeling performance between the concrete floor slab and the wooden surface material.

[0021] Another aspect of the synthetic floor according to the present invention is The first protrusion is one of a lag screw, a bolt, a rivet, a nail, and a metal plate.

[0022] According to this aspect, by applying a lag screw, bolt, or the like as the first convex portion, a composite floor can be formed that has high shear transmission performance and anti-peeling performance between the concrete floor slab and the wooden surface material with excellent manufacturability.

[0023] Another aspect of the synthetic floor according to the present invention is A first recess is provided on the lower wide surface of the wood surface material, A first protrusion protruding downward is provided on the lower wide surface of the wood surface material, The first protrusion is a rivet, and the rivet is disposed across the first recess, A portion of the concrete forming the concrete floor slab fits into the first recess, and the clamp fits into the concrete floor slab, thereby forming a shear key.

[0024] According to this aspect, a first convex portion, a clamp, which straddles a first concave portion provided on the lower wide surface of the wooden surface material, protrudes downward, and the clamp forms a shear key by penetrating into the concrete floor slab.As a result, a composite floor can be formed with even higher shear transfer performance (high composite effect) between the concrete floor slab and the wooden surface material, due to the shear key formed when part of the concrete enters the first concave portion and the shear key formed when the clamp enters into the concrete floor slab.

[0025] Another aspect of the synthetic floor according to the present invention is A first recess is provided on the lower wide surface of the wood surface material, A first protrusion protruding downward is provided on the lower wide surface of the wood surface material, the first protrusion is a fastener, In the area of ​​the lower wide surface of the wood panel where the first recess is not present, two fasteners are attached diagonally to form a V-shape in front view, forming a fastener unit; A portion of the concrete that forms the concrete floor slab enters the first recess, and the fastener unit enters the concrete floor slab, thereby forming a shear key.

[0026] According to this aspect, in an area on the lower wide surface of the wooden panel where there is no first recess, two fasteners are attached diagonally to form a fastener unit that is V-shaped in front view, and the fastener unit penetrates into the concrete floor slab to form a shear key.This shear key, formed when part of the concrete penetrates into the first recess, and the shear key, formed when the fastener unit penetrates into the concrete floor slab, create a composite floor with even higher shear transfer performance (high composite effect) between the concrete floor slab and the wooden panel.Here, lag screws, bolts, etc. can be used as the fasteners.

[0027] Another aspect of the synthetic floor according to the present invention is At the joint end where it is joined to another synthetic floor, The end of the wooden surface material is set back inward, and the end of the concrete floor slab protrudes laterally to form a protruding portion, The protruding portion is characterized in that it has second recesses and second protrusions alternately, and ends of the main reinforcement of the concrete slab protrude from the second recesses.

[0028] According to this aspect, at the joint end where the concrete floor is joined to another composite floor, the protruding portion at the end of the concrete floor slab, which is formed by setting back the end of the wood surface material inward, has alternating second recesses (cotters) and second convex portions, and the ends of the main reinforcement of the concrete floor slab protrude from the second recesses.This allows the main reinforcement of the concrete floor slab protruding from the second recesses at the joint end of the other composite floor to be joined via a lap joint, a mechanical joint, or welding, and then the second recesses are buried in concrete, etc., which contributes to the formation of a joint structure of the composite floor with high joint strength through efficient joint construction.

[0029] In addition, one aspect of the joint structure of the synthetic floor according to the present invention is as follows: The joint ends of the two composite floors are opposed to each other, and the second recesses of both are opposed to each other and aligned; Both of the main reinforcements protrude into the joint groove formed by both of the second recesses, and concrete is filled into the joint groove, A feature of this structure is that a gap-filling wooden surface material is disposed in the gap between the ends of two opposing wooden surface materials.

[0030] According to this embodiment, the main reinforcement bars of both composite floors extend into the joint groove formed by the second recess at the joint ends of the two composite floors, and are joined using a lap joint, a mechanical joint, or welding.The joint groove is then sealed by filling it with concrete, and a wooden surface material is placed in the gap between the ends of the two opposing wooden surface materials that are set back, resulting in a high joint strength and a wooden joint structure in which the surface of the joint has a unified look with the surface of the composite floor.

[0031] Also, one aspect of the method for producing a synthetic floor according to the present invention is to The wooden surface material is used as a bottom frame, side frames are installed on the sides of the bottom frame, a formwork is formed by the bottom frame and the side frames, reinforcement is placed on the wooden surface material, and concrete is poured inside the formwork, After the concrete has hardened to form a concrete floor slab, the side frames are removed from the form and the wooden surface material and the concrete floor slab are inverted to produce a composite floor having the wooden surface material and the concrete floor slab placed on the lower of a pair of wide surfaces of the wooden surface material.

[0032] According to this embodiment, a wooden panel is used as the lower frame, side frames are placed on the sides of the lower frame to form a formwork, and reinforcement is placed on top of the wooden panel and concrete is poured inside the formwork to form a concrete floor slab, thereby eliminating the need to install a lower frame and allowing for the production of a composite floor with good manufacturability.

[0033] Another aspect of the method for producing a composite floor according to the present invention is to Reinforcement is placed inside the formwork, and concrete is poured into the formwork. Before the concrete hardens, a wooden surface material is placed on the concrete. After the concrete has hardened to form a concrete floor slab, the formwork is removed and a composite floor is produced, comprising the wooden surface material and the concrete floor slab placed on the lower of a pair of wide surfaces of the wooden surface material.

[0034] According to this method, reinforcement is placed inside the formwork, concrete is poured, wooden surface material is placed on top before the concrete hardens, and the concrete is allowed to harden to integrate the two, thereby enabling the production of a composite floor with good manufacturability. [Effects of the Invention]

[0035] As can be seen from the above explanation, the composite floor and manufacturing method of the present invention can provide a composite floor that has excellent sound insulation and fire resistance, excellent connectivity with ceiling equipment, and can suppress distortion caused by aging. Furthermore, the joint structure of the composite floor of the present invention can provide a wooden joint structure with high joint strength and a consistent appearance on the surface of the joint with the surface of the composite floor. [Brief explanation of the drawings]

[0036] [Figure 1] FIG. 1 is a perspective view of an example of a synthetic floor according to an embodiment. [Figure 2] FIG. 2 is a view taken along the line II-II in FIG. [Figure 3] FIG. 10 is a perspective view of another example of a synthetic floor according to an embodiment. [Figure 4A] FIG. 4 is a view taken along the line IV-IV in FIG. 3, and is a longitudinal cross-sectional view showing an example of a shear key. [Figure 4B] 4 is a view taken along the line IV-IV in FIG. 3, and is a longitudinal sectional view showing another example of a shear key. [Figure 4C] 4 is a view taken along the line IV-IV in FIG. 3, and is a vertical cross-sectional view showing still another example of a shear key. [Figure 4D] 4 is a view taken along the line IV-IV in FIG. 3, and is a vertical cross-sectional view showing still another example of a shear key. [Figure 5A] FIG. 1 is a process diagram of an example of a method for manufacturing a synthetic floor according to an embodiment. [Figure 5B]5A, which is a process diagram of an example of a method for producing a synthetic floor according to an embodiment. [Figure 5C] 5B, which is a process diagram of an example of a method for producing a synthetic floor according to an embodiment. [Figure 6A] FIG. 1 is a process diagram of an example of a construction method for a joint structure of a composite floor according to an embodiment. [Figure 6B] 6A, followed by a process diagram of an example of a construction method for a joint structure of a composite floor according to an embodiment. [Figure 6C] 6B, and is a process diagram of an example of a construction method for a joint structure of a composite floor according to an embodiment, and is a perspective view of an example of a joint structure of a composite floor according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0037] Hereinafter, a composite floor, a joint structure for a composite floor, and a method for manufacturing the same according to an embodiment will be described 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, and redundant explanations may be omitted.

[0038] [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, Figure 1 is a perspective view of an example of a composite floor according to an embodiment, and Figure 2 is a view taken along arrows II-II in Figure 1. Also, Figure 3 is a perspective view of another example of a composite floor according to an embodiment, and Figures 4A to 4D are all views taken along arrows IV-IV in Figure 3, and are longitudinal cross-sectional views showing an example of a shear key.

[0039] The composite floor 50 shown in Figure 1 has a wood surface material 20 and a concrete floor slab 10 placed on the lower wide surface 22 of a pair of wide surfaces 21, 22 of the wood surface material, and is constructed in an integrated state. In other words, the wood surface material 20 is placed on the upper wide surface 11 of a pair of wide surfaces 11, 12 of the concrete floor slab 10, and the two are constructed in an integrated state.

[0040] The composite floor 50 has a flat rectangular parallelepiped shape, and the wooden surface material 20 and the concrete floor slab 10 are both plate-like members that are rectangular in plan view.

[0041] As will be explained in the manufacturing method below, the concrete floor slab 10 has a plurality of main reinforcements 16 (see Fig. 5A) extending in the longitudinal direction of the composite floor 50 arranged at a predetermined pitch in the lateral direction, a plurality of distribution reinforcements 17 (see Fig. 5A) extending in the lateral direction arranged at a predetermined pitch in the longitudinal direction, and a single reinforcement consisting of these main reinforcements 16 and distribution reinforcements 17 is provided at the center of the thickness, as in the case of a two-stage reinforcement arrangement in which units of main reinforcements 16 and distribution reinforcements 17 are provided at the top and bottom of the thickness, and two-stage reinforcement is applied when the thickness of the concrete floor slab 10 is relatively thick.

[0042] On the other hand, the wood surface material 20 is formed from cross laminated timber (CLT), nail laminated timber (NLT), dowel laminated timber (DLT), laminated veneer lumber (LVL), solid wood, etc.

[0043] As shown in Figure 2, the lower wide surface 22 of the wooden surface material 20 has a plurality of first protrusions 30 that protrude downward, and the first protrusions 30 penetrate into the concrete floor slab 10 to form a shear key, thereby integrating the concrete floor slab 10 and the wooden surface material 20.

[0044] Here, the first protrusion 30 in the illustrated example is a headed bolt, but instead of a headed bolt, it may be a lag screw, a nail, a metal plate, etc., and the metal plate may have a through hole therein with concrete filling the through hole. Furthermore, multiple types of first protrusions, such as a headed bolt and a lag screw, may be used.

[0045] In addition, the multiple first convex portions 30 may be arranged in various ways on the wide surface 22 of the wood surface material 20, such as being aligned at a predetermined pitch in the longitudinal and lateral directions, being randomly arranged on the wide surface 22, or being arranged concentrically.

[0046] When the composite floor 50 is placed on the beams that form the building frame, the concrete floor slab 10 located below is installed so that it rests on the beams. In other words, unlike conventional composite floors made of a general concrete floor slab and wooden surface materials, the composite floor 50 in the illustrated example has the concrete floor slab 10 located below and placed on the beams of the building frame, and the concrete floor slab faces the living rooms on the lower floors below to form the ceiling surface.

[0047] In this way, the non-flammable concrete floor slab 10 is located below the composite floor 50, which serves as the ceiling surface, thereby improving the fire resistance of the building.

[0048] Furthermore, since various ceiling equipment (none of which are shown) such as suspended ceilings, lighting equipment, air conditioning equipment, piping, and wiring are installed via bolts or the like onto the concrete floor slab 10 below, the installation strength, fire resistance, and weather resistance can be greatly improved compared to when installing them on wooden surface materials using bolts or the like.

[0049] In addition, by arranging the wooden surface material 20, which is relatively less susceptible to warping over time compared to the concrete floor slab 10, at the top, downward warping of the entire composite floor 50 due to warping over time can be minimized as much as possible.

[0050] Furthermore, since the wooden surface material 20, which is softer than the concrete floor slab 10, is located at the top, vibrations and noises that occur when walking on the wooden surface material 20 can be minimized.

[0051] Furthermore, by using the exposed wooden surface material 20, which has excellent design, the floor surface can be finished without the need for a separate floor finishing material. Furthermore, since this floor surface is not subject to interior decoration restrictions, measures such as fire-resistant coating are not required.

[0052] Furthermore, by having the multiple first protrusions 30 protruding downward from the lower wide surface 22 of the wooden surface material 20 penetrate into the concrete floor slab 10 and integrating the two, a composite floor 50 can be formed that has high shear transmission performance between the concrete floor slab 10 and the wooden surface material 20 (exhibiting a high composite effect).

[0053] On the other hand, the composite floor 60 shown in Figure 3 differs from the composite floor 50 in that a first recess 25 is provided on the broad surface 22 below the wooden surface material 20A, extending throughout the interior of the wooden surface material 20A, and part of the concrete that forms the concrete floor slab 10 enters into the first recess 25 to form a shear key 15.

[0054] Here, the first recess 25 may be a plurality of block-shaped recesses, or may be a plurality of groove recesses extending in the longitudinal direction.Furthermore, the first recess 25 may be a plurality of groove recesses extending in the lateral direction, or may have both groove recesses extending in the longitudinal direction and groove recesses extending in the lateral direction.

[0055] As shown in Figures 3 and 4A, in the illustrated example of composite floor 60, part of the concrete of concrete floor slab 10A enters first recess 25 to form shear key 15, thereby integrating concrete floor slab 10A and wooden surface material 20A. This configuration also makes it possible to form a composite floor 60 with high shear transmission performance between concrete floor slab 10A and wooden surface material 20A.

[0056] Here, in addition to the shear key 15 shown in FIG. 4A, a separate shear key may be further provided as shown in FIGS. 4B to 4D.

[0057] The configuration shown in FIG. 4B differs from the configuration shown in FIG. 4A in that a first protrusion 30 is provided in an area 23 of the lower broad surface 22 of the wood panel 20 where no first recess 25 is present.

[0058] Here, the first protrusion 30 in the illustrated example is a headed bolt, but the first protrusion 30 may also be a lag screw, a nail, a metal plate, etc., other than the illustrated example, and the metal plate may have a through hole therein.

[0059] The illustrated example has a shear key 15 formed by a portion of the concrete of the concrete floor slab 10 entering the first recess 25 of the wooden surface material 20, and a shear key consisting of a headed bolt 30 that protrudes downward from the lower wide surface 22 of the wooden surface material 20 and enters the concrete floor slab 10A, thereby forming a composite floor 60 with even higher shear transmission performance (high composite effect) between the concrete floor slab 10 and the wooden surface material 20.

[0060] On the other hand, the form shown in Figure 4C differs from the form shown in Figure 4A in that in the region 23 of the lower wide surface 22 of the wood panel 20 that does not have the first recess 25, two fasteners 30 (first convex portions) are attached diagonally to form a fastener unit 30A that is V-shaped when viewed from the front.

[0061] Even in the illustrated example, by having a shear key 15 formed by a portion of the concrete of the concrete floor slab 10 entering the first recess 25 of the wooden surface material 20, and a shear key consisting of a fastener unit 30A that protrudes downward from the lower wide surface 22 of the wooden surface material 20 and enters the concrete floor slab 10A, it is possible to form a composite floor 60 that has even higher shear transmission performance between the concrete floor slab 10 and the wooden surface material 20.

[0062] On the other hand, the configuration shown in Figure 4D differs from the configuration shown in Figure 4A in that a first protrusion 40 consisting of a downwardly protruding clamp is arranged across the first recess 25 on the lower wide surface 22 of the wood panel 20.

[0063] Even in the illustrated example, by having a shear key 15 formed by a portion of the concrete of the concrete floor slab 10 entering the first recess 25 of the wooden surface material 20, and a shear key consisting of a clamp 40 that protrudes downward from the lower wide surface 22 of the wooden surface material 20 and enters the concrete floor slab 10A, a composite floor 60 can be formed that has even higher shear transmission performance between the concrete floor slab 10 and the wooden surface material 20.

[0064] [Method for manufacturing a synthetic floor according to the embodiment] Next, an example of a method for manufacturing a composite floor according to an embodiment will be described with reference to Figures 5A to 5C. Figures 5A to 5C are process diagrams of an example of a method for manufacturing a composite floor according to an embodiment. In the following description, a method for manufacturing the composite floor 50 shown in Figure 1 will be described, but for ease of visualization, the first protrusion 30 shown in Figure 2 will be omitted.

[0065] The method of manufacturing a composite floor is as follows: first, as shown in Figure 5A, the upper wide surface 21 and the lower wide surface 22 of the wooden panel 20 are inverted to form the bottom frame, side frames (not shown) are placed on the sides of the bottom frame, a formwork is formed by the wooden panel 20 that serves as the bottom frame and the side frames (not shown), and spacers (not shown) are placed on top of the wide surface 22.

[0066] Next, on top of the spacers, multiple main reinforcements 16 extending in the longitudinal direction are arranged at a predetermined pitch in the lateral direction, and multiple distribution reinforcements 17 extending in the lateral direction are arranged at a predetermined pitch in the longitudinal direction. In the illustrated example, the height of the reinforcement is adjusted by spacers (not shown) so that the single reinforcement consisting of these main reinforcements 16 and distribution reinforcements 17 is arranged at the center of the thickness of the concrete floor slab 10 to be manufactured.

[0067] Next, concrete is poured into the formwork, and the side frames are removed after the concrete has hardened, thereby forming a composite floor intermediate body 50', in which the concrete floor slab 10 is layered on top of the wooden surface material 20 placed below, as shown in Figure 5B.

[0068] Next, as shown in FIG. 5C, the composite floor intermediate body 50' is turned over in the X direction to produce a composite floor 50 in which the wood surface material 20 is layered on the concrete floor slab 10.

[0069] According to the manufacturing method shown in the figure, the wooden surface material 20 is used as the lower frame, side frames are installed on the sides of the lower frame to form a formwork, reinforcement is arranged on top of the wooden surface material 20, and concrete is poured inside the formwork to form the concrete floor slab 10, thereby eliminating the need to install a lower frame and allowing the composite floor 50 to be manufactured with good manufacturability.

[0070] Although not shown here, a manufacturing method other than the illustrated example may be used, in which reinforcement is arranged inside the formwork, concrete is poured inside the formwork, a wooden surface material is placed on the surface of the concrete before the concrete hardens, and the formwork is removed after the concrete hardens to form a concrete floor slab. With this method, the composite floor 50 is produced at the same time as the formwork is removed, so there is no need to invert the produced intermediate body.

[0071] [Joint structure of composite floor according to the embodiment] Next, an example of a joint structure of a composite floor according to an embodiment will be described together with its construction method with reference to Figures 6A to 6C. Figures 6A to 6C are process diagrams of an example of a construction method of a joint structure of a composite floor according to an embodiment, and Figure 6C is a perspective view of an example of a joint structure of a composite floor according to an embodiment.

[0072] The illustrated example illustrates a method of joining multiple composite floors 50A, in which the joint ends 52 of the composite floors 50A are placed facing each other on top of a beam 80 made of H-shaped steel that has been installed on site, and the composite floors 50A whose joint ends 52 face each other are joined together, thereby explaining an example of a composite floor joining structure.

[0073] At the joint end 52 of the composite floor 50A, the end 24 of the wood surface material 20 is set back inward (away from the beam 80), and the end of the concrete floor slab 10 protrudes to the side (towards the opposing composite floor) to form a protruding portion 18.

[0074] The protruding portion 18 has second recesses 19B (cotters) and second protrusions 19A alternately, and the ends of the main reinforcements 16 of the concrete floor slab 10 protrude into the second recesses 19B.

[0075] The main reinforcements 16 extending from the ends of both concrete deck slabs 10 are arranged in the joint grooves 19C formed by the corresponding second recesses 19B of both joint ends 52, and the corresponding main reinforcements 16 are joined to each other by lap splicing at a predetermined lap length, by joining via a mechanical joint, or by welding.

[0076] In the illustrated example, a stud dowel 85 is attached to the upper surface of the upper flange 81 of the beam 80 so as to protrude upward, and the stud dowel 85 is also housed in the joint groove 19C.

[0077] Next, filling concrete 70 is poured into each joint groove 19C and the gap between the opposing second convex portions 19A, so that the main reinforcement bars 16 and stud dowels 85 that are joined to each other are embedded in the concrete 70, and the ends of the concrete floor slabs 10 of the opposing composite floors 50A are joined together.

[0078] In the illustrated example, the stud dowels 85 attached to the beams 80 are embedded in the concrete 70, and the concrete 70 is poured into the cotter 19B and integrated with the cotter 19B, thereby ensuring high bond strength between each composite floor 50A and the beams 80.

[0079] Next, as shown in Figure 6C, a gap-filling wooden surface material 20B is arranged in the gap between the ends 24 of each of the wooden surface materials 20 of two opposing synthetic floors 50A, thereby forming a composite floor joint structure 90 consisting of multiple synthetic floors 50A and gap-filling wooden surface materials 20B.

[0080] According to the joint structure 90 shown in the figure, the main reinforcements 16 of both composite floors 50A extend into the joint groove 19C formed by the second recesses 19B at the joint ends 52 of the two composite floors 50A and are joined together.The joint groove 19C is then filled with concrete 70 to close the joint groove 19C, and a wooden surface material 20B is placed in the gap between the ends 24 of the two opposing wooden surface materials 20 that are set back, thereby forming a wooden joint structure 90 with high joint strength and a unified appearance in which the surface of the wooden surface material 20B matches the surface of the composite floor 50A.

[0081] 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]

[0082] 10, 10A: Concrete floor slab 11: Upper broad surface (wide surface) 12: Lower broad surface (broad surface) 15: Shiaki 16: Main reinforcement 17: Distribution reinforcement 18:Protruding part 19A: Second convex part 19B: Second recess (cotter) 19C:Join groove 20, 20A: Wood surface material 20B: Wood surface material for filling gaps 21: Upper broad surface (broad surface) 22: Lower broad surface (broad surface) 23: Area without recesses 24:End 25: First recess 30: First convex part (fastener, headed bolt) 30A: Fastener unit 40: First protrusion (fastener, rivet) 50,50A:Synthetic floor 50': intermediate for synthetic floor 52:Joining end 60:Synthetic floor 70: Concrete 80: Beam 81: Upper flange 85: Stud dowel 90: Joint structure (joint structure of composite floor)

Claims

1. A composite floor comprising a wooden surface material and a concrete floor slab placed on the lower wide surface of a pair of wide surfaces of the wooden surface material.

2. A first recess is provided on the lower wide surface of the wood surface material, 2. The composite floor according to claim 1, wherein a portion of the concrete forming the concrete floor slab is inserted into the first recess to form a shear key.

3. A first protrusion protruding downward is provided on the lower wide surface of the wood surface material, 2. The composite floor according to claim 1, wherein the first protrusions are recessed into the concrete floor slab to form shear keys.

4. 4. The synthetic floor according to claim 3, wherein the first protrusion is one of a lag screw, a bolt, a rivet, a nail, and a metal plate.

5. A first recess is provided on the lower wide surface of the wood surface material, A first protrusion protruding downward is provided on the lower wide surface of the wood surface material, The first protrusion is a rivet, and the rivet is disposed across the first recess, 2. The composite floor described in claim 1, characterized in that a portion of the concrete forming the concrete floor slab enters the first recess, and the clamp enters the concrete floor slab, thereby forming a shear key.

6. A first recess is provided on the lower wide surface of the wood surface material, A first protrusion protruding downward is provided on the lower wide surface of the wood surface material, the first protrusion is a fastener, In the area of ​​the lower wide surface of the wood surface material where the first recess is not present, two fasteners are attached obliquely to form a V-shape in front view, forming a fastener unit; 2. The composite floor described in claim 1, characterized in that a portion of the concrete forming the concrete floor slab enters the first recess, and the fastening unit enters the concrete floor slab, thereby forming a shear key.

7. At the joint end where it is joined to another synthetic floor, The end of the wooden surface material is set back inward, and the end of the concrete floor slab protrudes laterally to form a protruding portion, 2. A composite floor as described in claim 1, characterized in that the protruding portion has alternating second recesses and second protrusions, and the ends of the main reinforcement of the concrete floor slab protrude from the second recesses.

8. The joint ends of the two composite floors according to claim 7 are opposed to each other, and the second recesses of both are opposed to each other and aligned; Both of the main reinforcements protrude into the joint grooves formed by both of the second recesses, and concrete is filled into the joint grooves, A joint structure for a composite floor, characterized in that a gap-filling wooden surface material is disposed in the gap between the ends of two opposing wooden surface materials.

9. The wooden surface material is used as a bottom frame, side frames are installed on the sides of the bottom frame, a formwork is formed by the bottom frame and the side frames, reinforcement is placed on the wooden surface material, and concrete is poured inside the formwork, After the concrete has hardened to form a concrete floor slab, the side frames are removed from the formwork and the wooden surface material and the concrete floor slab are inverted to produce a composite floor having the wooden surface material and the concrete floor slab arranged on the lower wide surface of a pair of wide surfaces of the wooden surface material.

10. Reinforcement is placed inside the formwork, and concrete is poured into the formwork. Before the concrete hardens, a wooden surface material is placed on the concrete. After the concrete has hardened to form a concrete floor slab, the formwork is removed and a composite floor is produced having the wooden surface material and the concrete floor slab placed on the lower wide surface of a pair of wide surfaces of the wooden surface material.

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