Composite material

Abstract

The present invention relates to a composite member having wood material and a concrete slab, and provides a composite member that exhibits excellent stress transfer between the wood material and the concrete slab and does not risk reducing on-site workability. [Solution] The composite member 50 (60) has a wood material 10 and a concrete floor slab 20 disposed on the upper surface 15 of the wood material 10. The upper surface 15 is provided with a slit 17 with a width t1, and a steel plate 30 with a thickness t2 that is thinner than the width t1 has two or more protrusions 36A, 36B that protrude from both sides of its pair of wide surfaces 31A, 31B. The embedded area 32 of the steel plate 30 is inserted into the slit 17, and the two or more protrusions 36A, 36B that protrude in opposite directions abut against a pair of opposing inner wall surfaces 17a, 17b of the slit 17 to maintain the embedded position and upright posture of the steel plate 30 relative to the slit 17. The slit 17 is filled with adhesive 40, and the protruding area 33 of the steel plate 30 that protrudes from the slit 17 acts as a shear key and is embedded in the concrete floor slab 20.

Description

Technical Field

[0001] The present invention relates to composite members such as composite floors and composite beams.

Background Art

[0002] On October 1, 2010, the "Law Concerning the Promotion of the Use of Wood in Public Buildings, etc." was enacted. As one of the purposes to contribute to the realization of carbon neutrality and the prevention of global warming, for example, the woodenization (conversion to a wooden structure) or the application of wood (such as to interior finishes) of low-rise public buildings is planned, and the promotion of the use of wood is currently underway.

[0003] Also, in the Building Standards Law, due to the law amendment in 2000, the previous regulation that wooden structures should be three stories or less has been abolished, and wooden buildings of four stories or more are permitted on the condition that even if the main structural members are made of wood, they are made of fire-resistant materials. In combination with the above-mentioned Law for the Promotion of the Use of Wood, the construction of wooden buildings including high-rise buildings is expected to become even more active in the future.

[0004] Here, when looking at the floors of buildings such as apartment houses, when constructing the floor only with wood such as a wooden surface material, in order to improve or enhance the performance that is a problem for wood such as sound insulation and fire resistance, a composite floor in which a wooden surface material and a concrete floor slab are laminated, or a composite beam in which a wooden beam and a concrete floor slab are laminated may be constructed.

[0005] Here, Patent Document 1 proposes a composite floor structure. This composite floor structure includes a wooden floor structure made of a wooden material, a reinforced concrete slab provided on the upper surface of the wooden floor structure, and screw-shaped nails driven into the upper surface of the wooden floor structure to connect the wooden floor structure and the reinforced concrete slab, and has a structure in which a fire-resistant coating material is not provided on the lower surface of the wooden floor structure.

Prior Art Documents

Patent Documents

[0006] [Patent Document 1] Japanese Patent Publication No. 2021-173020 [Overview of the project] [Problems that the invention aims to solve]

[0007] According to the composite floor structure described in Patent Document 1, since no fire-resistant coating material is provided on the underside of the wooden floor, the surface of the wooden floor can be left exposed. However, in the composite floor structure described in Patent Document 1, stress transfer between the wooden floor and the reinforced concrete slab is performed by screws, so it is unavoidable that a large number of screws will be needed to satisfy the required stress transfer performance. As a result, the reinforced concrete slab must be constructed under conditions where a large number of screws protrude from the upper surface of the wooden floor, which leads to a problem of reduced constructability of the reinforced concrete slab.

[0008] The present invention has been made in view of the above problems, and aims to provide a composite member having wood material and concrete slab that has excellent stress transmission properties between wood material and concrete slab and does not risk a decrease in on-site workability. [Means for solving the problem]

[0009] To achieve the above objective, one embodiment of the composite member according to the present invention is: A composite member comprising a wood material and a concrete floor slab disposed on the upper surface of the wood material, The upper surface is provided with a slit of width t1, A steel plate having a thickness t2 that is thinner than the width t1 is provided with two or more protrusions projecting from both of its pair of wide surfaces, and the embedded portion of the steel plate is inserted into the slit, and the two or more protrusions projecting in opposite directions each abut against a pair of opposing inner wall surfaces of the slit, thereby maintaining the embedded position and upright orientation of the steel plate relative to the slit. The slit is filled with adhesive, and the protruding region of the steel plate that extends from the slit acts as a shear key, which is embedded in the concrete slab.

[0010] In this embodiment, an embedded area of ​​a steel plate with a relatively thin thickness is inserted into a slit on the upper surface of the wood material, and a protruding area of ​​the steel plate that extends from the slit acts as a shear key and is embedded in the concrete floor slab. The embedded area has two or more protrusions that protrude in opposite directions, and adhesive is filled into the slit with each protrusion in contact with a pair of opposing inner wall surfaces of the slit. This allows the steel plate to be joined to the wood material with high strength while maintaining the embedded position and upright posture of the steel plate in the slit, and the wood material and the concrete floor slab can be joined with high strength via the steel plate, thereby forming a composite member with excellent stress transmission properties. Furthermore, since the steel plate that acts as a shear key is embedded and bonded in the slit, the number of steel plates required to achieve the same level of shear strength is significantly less compared to a configuration using multiple stud dowels as shear keys, resulting in improved workability. Additionally, since the number of steel plates that protrude from the upper surface of the wood material is small, it does not reduce the workability of the concrete floor slab on site, resulting in a composite member with excellent on-site workability.

[0011] For example, the sum of the protruding lengths of the left and right protrusions that protrude in opposite directions and the thickness t2 of the steel plate is set to be equivalent to the width t1 of the slit.

[0012] The protruding region (shear key) of the steel plate, which extends from the top surface of the wood material and is embedded in the concrete slab, resists the acting shear force with the bearing resistance force provided by the area of ​​the protruding region. Therefore, the bearing resistance performance can be changed by adjusting the area of ​​the protruding region.

[0013] Furthermore, other embodiments of the composite member according to the present invention are: The present invention is characterized in that each of the pair of wide surfaces is provided with two or more protrusions at different height levels.

[0014] According to this embodiment, since two or more protrusions at different height levels are provided on both of the pair of wide surfaces, the embedded position and upright posture of the steel plate relative to the slit can be maintained more stably.

[0015] Furthermore, other embodiments of the composite member according to the present invention are: The sear key is characterized by having a separate protrusion or through hole provided therein.

[0016] According to this embodiment, the shear strength can be further increased by providing the shear key with additional protrusions or through holes. Furthermore, the concrete that penetrates the protrusions or through holes in the shear key can form a separation resistance means (or peeling resistance means) that resists the separation (peeling) of the concrete slab and the wood material in the vertical direction.

[0017] Furthermore, in another embodiment of the composite member according to the present invention, The aforementioned protrusion is characterized by being an embossed portion on the wide surface.

[0018] According to this embodiment, since the protrusions provided on the steel plate are embossed portions, the protrusions can be formed using a relatively simple processing method.

[0019] Furthermore, in another embodiment of the composite member according to the present invention, The aforementioned protrusion is characterized by being a burring process portion on the wide surface.

[0020] According to this embodiment, since the protrusions provided on the steel plate are burring portions, the adhesive is filled into the slit while penetrating the through-holes of the burring portions, thereby further increasing the bonding strength between the embedded area of ​​the steel plate and the slit.

[0021] Furthermore, other embodiments of the composite member according to the present invention are: In the shear key, there is a protruding piece that protrudes laterally, and the protruding piece is a separation resistance means between the concrete floor slab and the wood material.

[0022] According to this aspect, since a protruding piece that protrudes laterally is provided in the shear key and is embedded in the concrete floor slab, the protruding piece can form a separation resistance means between the concrete floor slab and the wood material. Here, since convex portions or through holes are provided at positions different from the protruding piece in the shear key as described above, these also serve as separation resistance means, so the separation resistance between the concrete floor slab and the wood material is further improved.

[0023] The protruding piece can be formed by welding a separate steel plate to the wide surface of the steel plate or by bending the upper part of the steel plate. In the former form, a separate steel plate may be welded to both of the pair of wide surfaces of the steel plate. Also, in the latter form, the upper part of the steel plate may be bent in a zigzag shape.

[0024] Also, in another aspect of the composite member according to the present invention, the protruding piece is a bent piece that extends in a direction orthogonal to the embedding region by bending the upper part of the steel plate, the length from the upper surface to the bent piece is set to the cover thickness of the floor reinforcement embedded in the concrete floor slab, and the floor reinforcement is placed on the bent piece.

[0025] According to this aspect, the protruding piece is, for example, a bent piece formed by bending the upper part of a vertically standing steel plate in an orthogonal direction so as to extend horizontally, and the length from the upper surface of the wood material to the bent piece is set to the cover thickness of the floor reinforcement, so that a spacer or the like is not required, and the floor reinforcement can be stably placed and arranged at a position ensuring a predetermined cover thickness.

[0026] For example, to ensure that the steel plate is embedded in the slit with a predetermined embedding length even when the steel plate expands due to temperature changes, and to secure space for filling the area below the steel plate with adhesive, it is preferable that the slit be made deeper than the embedding length set for the embedding area of ​​the steel plate. In this case, the embedding area of ​​the steel plate is installed relative to the slit while measuring the cover thickness, so that the bent piece of the steel plate protrudes from the top surface of the wood material by the thickness of the floor reinforcement.

[0027] Furthermore, in another embodiment of the composite member according to the present invention, The protruding piece is a bent piece formed by bending the upper part of the steel plate, extending in a direction having an acute central angle with respect to the embedded region. The invention is characterized in that, when the tip of the bent piece is brought into contact with the upper surface of the wood material, the length from the upper surface to the bent portion of the steel plate is set to the cover thickness of the floor reinforcement embedded in the concrete floor slab, and the floor reinforcement is placed on the bent portion.

[0028] According to this embodiment, the overhanging piece is a bent piece formed such that, for example, the upper part of a vertically erected steel plate extends in a direction having an acute central angle with respect to the embedded area. When the tip of the bent piece is brought into contact with the upper surface of the wood material, the length of the steel plate up to the bent portion is set to the cover thickness of the floor reinforcement. As a result, simply by inserting the embedded area of ​​the steel plate into the slit, the bent portion of the steel plate is automatically positioned to match the cover thickness of the floor reinforcement without measuring the cover thickness. This allows the floor reinforcement to be stably placed and arranged on this bent portion.

[0029] Furthermore, in another embodiment of the composite member according to the present invention, The bending process piece is characterized by having a through hole.

[0030] According to this embodiment, since the bent piece, which is an overhanging piece, has through holes, the concrete that is filled when forming the concrete slab can be supplied to the lower part of the bent piece through the through holes, thereby suppressing the formation of air pockets, which are areas of unfilled concrete, below the bent piece. Furthermore, since the concrete penetrates through the through holes in the bent piece, the shear strength of the penetrating concrete is added to the shear strength of the composite member.

[0031] Furthermore, in another embodiment of the composite member according to the present invention, The wood material is characterized by being one of the following: laminated timber, solid wood, structural plywood, laminated veneer timber, cross-laminated board, or nail-jointed laminated board.

[0032] According to this embodiment, various forms of wood materials can be applied as long as the wood material is one of the following: laminated timber, solid wood, structural plywood, laminated veneer lumber (LVL), cross-laminated timber (CLT), or nail-laminated timber (NLT).

[0033] In particular, when the wood material is a flat wood panel, and this wood panel is formed from orthogonal laminated board, it is preferable because, for example, a wider range of wood panels with greater length and width dimensions can be applied compared to other forms, thereby minimizing the number of connection points between wood panels on site.

[0034] Furthermore, in another embodiment of the composite member according to the present invention, The aforementioned wood material is a wood surface material, and the composite floor consists of the wood surface material and the concrete floor slab. The wood material is characterized by being either a wooden beam or a composite beam consisting of the wooden beam and the concrete floor slab.

[0035] According to this embodiment, when the wood material is a wood surface material, the composite member becomes a composite floor, and when the wood material is a wood beam, the composite member becomes a composite beam. This makes it possible to form a composite floor or composite beam that has excellent stress transfer properties between the wood material and the concrete floor slab and does not risk a decrease in on-site constructability. [Effects of the Invention]

[0036] As can be understood from the above explanation, the present invention provides a composite member having wood material and a concrete slab, which has excellent stress transfer properties between the wood material and the concrete slab and does not risk reducing on-site workability. [Brief explanation of the drawing]

[0037] [Figure 1A] This is a perspective view of a part of a composite floor, which is an example of a composite member according to the embodiment. [Figure 1B] This is a perspective view of a part of a composite beam, which is another example of a composite member according to the embodiment. [Figure 2] This is a longitudinal cross-sectional view taken at the installation position of an example of a steel plate in a composite member according to the embodiment. [Figure 3] This is a perspective view of an example of a steel plate connecting wood and a concrete floor slab. [Figure 4] This is a longitudinal cross-sectional view taken at the installation position of another example of the steel plate in the composite member according to the embodiment. [Figure 5] This is a perspective view of another example of a steel plate connecting wood and a concrete floor slab. [Figure 6] This is a perspective view of yet another example of a steel plate connecting wood and a concrete floor slab. [Modes for carrying out the invention]

[0038] The composite members according to the embodiment will be described below with reference to the attached drawings. In this specification and drawings, substantially identical components may be denoted by the same reference numerals to avoid redundant explanations.

[0039] [Composite member according to the embodiment] An example of a composite member according to the embodiment will be described with reference to Figures 1 to 6. Here, Figure 1A is a perspective view of a part of a composite floor, which is an example of a composite member according to the embodiment, and Figure 1B is a perspective view of a part of a composite beam, which is another example of a composite member according to the embodiment. Figure 2 is a perspective view of an example of a steel plate connecting a wood material and a concrete floor slab, and Figure 3 is a longitudinal cross-sectional view taken at the installation position of another example of a steel plate in the composite member according to the embodiment. Furthermore, Figure 4 is a longitudinal cross-sectional view taken at the installation position of another example of a steel plate in the composite member according to the embodiment, and Figures 5 and 6 are both perspective views of other examples of a steel plate connecting a wood material and a concrete floor slab.

[0040] The composite members according to this embodiment include the composite floor 50 shown in Figure 1A and the composite beam 60 shown in Figure 1B.

[0041] The composite floor 50 (an example of a composite member) shown in Figure 1A has a wood-based surface material 10A (an example of a wood-based material) and a concrete floor slab 20 placed on the upper surface 15 (one of the wider surfaces) of the wood-based surface material 10A. Inside the concrete floor slab 20, there are single reinforcement (see Figure 3A) and double reinforcement, in which multiple floor reinforcements 28 are arranged in a grid pattern in plan view.

[0042] The illustrated example of the wood panel 10A is formed from cross-laminated timber (CLT). CLT 10A is formed by laminating multiple veneers 11, each made by joining multiple sawn boards 12 with aligned wood grain directions using adhesive, so that the grain directions are perpendicular to each other, and then joining them with adhesive. Note that there are also forms in which the multiple sawn boards 12 constituting the veneer 11 are not joined with adhesive.

[0043] Here, the wood panel 10A may be formed from materials other than CLT as shown in the illustrated example, such as nail-jointed laminated timber (NLT), laminated veneer lumber (LVL), or structural plywood. However, CLT can be used for a wide range of wood panels up to approximately 12m x 2m in length and width dimensions, thus minimizing the number of connection points between wood panels on site. This leads to improved load-bearing capacity and construction efficiency of the composite floor 50. Furthermore, since CLT is laminated with multiple veneers 11 arranged perpendicular to each other in the fiber direction, it is resistant to deformation, which is preferable as it further improves the rigidity of the composite floor 50.

[0044] The wooden panel 10A and the concrete floor slab 20 are joined via steel plates 30, etc., as described below.

[0045] On the other hand, the composite beam 60 shown in Figure 1B (another example of a composite member) has a wooden beam 10B (another example of a wooden material) and a concrete floor slab 20 placed on the upper surface 15 of the wooden beam 10B, and the two are joined together via a steel plate 30 or the like, similar to the composite floor 50.

[0046] The wooden beam 10B in the illustrated example is formed from laminated boards consisting of multiple veneers 13, but it may also be formed from CLT, LVL, solid wood, etc.

[0047] Since the composite floor 50 and composite beam 60 shown in Figures 1A and 1B both have a common joint structure for joining the wood material 10 and the concrete floor slab 20, the steel plates 30 and other components of the joint structure, and the joint structure via the steel plates 30 and other components will be explained in detail below.

[0048] As shown in Figure 2, the wood material 10 has a slit 17 with a length t8 and a width t1 extending from its top surface 15 into the interior. Although Figure 2 shows one slit 17, the wood material 10 has a number of slits 17 corresponding to the number of steel plates 30, depending on the required shear strength, and these slits are provided in a aligned or random arrangement.

[0049] An embedding area 32 of a steel plate 30 having a thickness t2 that is thinner than the width t1 of the slit 17 is provided in the slit 17, and the steel plate 30 is joined to the wood material 10 by filling the slit 17 with adhesive 40.

[0050] Of the steel plate 30, the protruding region 33 that extends upward from the upper surface 15 of the wood material 10 is embedded in the concrete floor slab 20 and functions as a shear key.

[0051] As shown in Figure 2 and Figure 3, which shows an enlarged perspective view of the steel plate 30, in the embedded area 32 of the pair of wide surfaces 31A and 31B of the steel plate 30, there are protrusions 36A and 36B that project from both wide surfaces 31A and 31B at a height t3 from the lower end 32a, and there are also protrusions 36A and 36B that project from both wide surfaces 31A and 31B at a height t4 (t4>t3) from the lower end 32a.

[0052] For example, when the wide surface 31A is viewed from the front, the four protrusions 36 are located at the four corners of a square or rectangle, two protrusions 36A are at diagonal positions, and similarly the other two protrusions 36B (which protrude to the opposite side) are also at diagonal positions.

[0053] Then, as shown in Figure 2, when the embedded area 32 is inserted into the slit 17 with a width t1, the two protrusions 36A protruding from the wide surface 31A abut against one inner wall surface 17a of the slit 17, and the other two protrusions 36B protruding from the wide surface 31B abut against the other inner wall surface 17b of the slit 17, thereby maintaining the embedded position and upright posture of the steel plate 30 relative to the slit 17. The steel plate 30 is embedded, for example, in the center of the width t1 of the slit 17.

[0054] For example, the sum of the protruding lengths of the left and right protrusions 36A and 36B, which protrude in opposite directions, and the thickness t2 of the steel plate 30 is set to be equivalent to the width t1 of the slit 17.

[0055] The two protrusions 36A and 36B that project from both wide surfaces 31A and 31B of the embedded area 32 are at different height levels, which allows the steel plate 30 to maintain a stable upright position relative to the slit 17. However, there are many other possible arrangements of the number and configuration of the protrusions 36 in the embedded area 32 besides those shown.

[0056] The protrusions 36 provided in the embedded area 32 are embossed portions formed by embossing the wide surface of the steel plate 30.

[0057] In the protruding region 33 of the steel plate 30, an intermediate position is bent at a bending angle of central angle θ1, and an overhanging piece 35 (bent piece) is provided that extends in a direction perpendicular to the embedded region 32, etc., via the bent portion 34. For example, the region from the embedded region 32 to the bent portion 34 of the protruding region 33 extends vertically, and the overhanging piece 35 extends horizontally via the bent portion 34 with a central angle θ1 of 90 degrees.

[0058] In the illustrated example, the protruding region 33 which serves as the shear key is provided with multiple (two in the illustrated example) through holes 38, and the overhanging piece 35 is also provided with multiple (two in the illustrated example) through holes 39.

[0059] As shown in Figure 2, when inserting the embedded area 32 into the slit 17, the embedded area 32 is inserted into the slit 17 and aligned so that the height t7 from the upper surface 15 of the wood material 10 to the overhanging piece 35 is equal to the cover thickness of the floor reinforcement 28 embedded in the concrete floor slab 20. In other words, the height t9 of the embedded area 32 is set to a length that prevents the embedded area 32 from being pulled out of the slit 17 when a shear force is applied to the steel plate 30, and the height t7 from the upper surface 15 of the wood material 10 to the overhanging piece 35 is set to be equal to the cover thickness of the floor reinforcement 28.

[0060] Since the steel plate 30 can expand due to temperature changes, the depth t9 of the slit 17 is set deeper than the embedding length t8 set for the embedding area 32 of the steel plate 30 in order to ensure that the steel plate 30 is embedded in the slit 17 with a predetermined embedding length even when the steel plate 30 expands. For this reason, the embedding area 32 of the steel plate 30 is installed in relation to the slit 17 while measuring the cover thickness, so that the protruding piece 35 of the steel plate 30 protrudes from the upper surface 15 of the wooden material 10 with the cover thickness of the floor reinforcement 28.

[0061] For example, by placing the floor reinforcement 28 on the horizontally extending overhang 35, the installation of spacers and the like is unnecessary, and the floor reinforcement 28 can be arranged with a predetermined cover thickness.

[0062] In this example, the protruding piece 35 is formed from a bent piece created by bending the steel plate 30 at an intermediate position in the protruding region 33. However, the protruding piece may also be formed by welding a separate steel plate to the steel plate. Nevertheless, the bent piece 35 in the illustrated example is formed by bending the steel plate 30, which is easier to process than welding, resulting in better manufacturability.

[0063] Here, as an example of the dimensions of the steel plate 30 to be applied, the length t5 of the vertical region of the steel plate 30 (length to the bent portion 34) can be set to about 100 mm, the cover thickness t7 to about 30 mm to 40 mm, the width t6 to about 100 mm, and the thickness t2 (plate thickness) to about 3.2 mm or 2.3 mm. In addition, the center distance between the two lateral protrusions 36 can be set to about 50 mm, the length from each protrusion 36 to the lateral edge can be set to 25 mm, and the length t5' of the overhang 35 can be set to about 30 mm.

[0064] When the thickness t2 of the steel plate 30 is 3.2 mm, the width t1 of the slit 17 can be set to about 6 mm, and when the thickness t2 of the steel plate 30 is 2.3 mm, the width t1 of the slit 17 can be set to about 4.5 mm to 5 mm.

[0065] After arranging multiple floor reinforcements 28 in each of the cantilevered pieces 35 of the multiple steel plates 30, concrete is poured into a formwork (not shown) to form a concrete floor slab 20. At this time, the concrete flows downward in the Y1 direction through the through holes 39 provided in the cantilevered pieces 35, effectively filling the area below the cantilevered pieces 35 with concrete, thereby suppressing the formation of air pockets, which are areas of unfilled concrete, below the cantilevered pieces 35.

[0066] In the protruding region 33 of the steel plate 30 that forms the shear key, the filled concrete will penetrate through the through hole 38 and harden.

[0067] A composite member 50 (60) is formed when the wood material 10 and the concrete floor slab 20 are joined together by multiple shear keys 33, including one shear key 33 as shown in Figure 2.

[0068] As shown in Figure 2, when a horizontal shear force Q acts on the composite member 50 (60), the steel plate 30 joining the wood material 10 and the concrete slab 20 will resist the force through its bearing resistance force S1 and the shear resistance force S2 provided by the concrete passing through the through-hole 39 of the overhanging piece 35. This makes it possible to form a composite member 50 (60) with excellent stress transfer properties between the wood material 10 and the concrete slab 20.

[0069] Furthermore, a force (separation force) may act on the wood material 10 and the concrete floor slab 20 in the vertical Z direction, but this separation force can be resisted by the separation resistance force S5 due to the bearing pressure of the overhanging piece 35 (an example of a separation resistance means) and the shear resistance force (separation resistance force S6) of the concrete (another example of a separation resistance means) that penetrates the through-hole 38 of the protruding region 33.

[0070] Furthermore, according to the composite member 50 (60) shown in the illustration, compared to conventional composite members that use numerous stud dowels as shear keys, the number of steel plates 30 that can exhibit the same level of shear strength is significantly reduced, resulting in improved ease of installation of the steel plates 30. In addition, it eliminates the need to construct a reinforced concrete slab under conditions where numerous screws protrude from the upper surface 15 of the wood material 10. The workability of the concrete slab 20 will also be improved.

[0071] The composite member 50A (60A) shown in Figure 4 differs from the composite member 50 (60) which uses steel plate 30 in that it uses a steel plate 30A (Figure 5 is an enlarged perspective view) which has a bent portion 35A in which the bending angle θ1 at the bent portion 34 is not 90 degrees, but the bending angle θ2, which is the central angle, is an acute angle of less than 90 degrees.

[0072] As shown in Figure 4, when the steel plate 30A is inserted into the slit 17, the tip 35a of the bent piece 35A comes into contact with the upper surface 15 of the wood material 10, and the central angle θ2 and the length t5" of the bent piece 35A are set so that the height t7 from the upper surface 15 to the bent portion 34 becomes the cover thickness of the floor reinforcement 28. Here, the central angle θ2 can be set to an acute angle of about 30 to 50 degrees.

[0073] As shown in Figure 4, the reinforcement bars 28 will be arranged so that they rest on the bent section 34.

[0074] In this way, by applying the steel plate 30A, when inserting and installing the steel plate 30A into the slit 17, the insertion of the steel plate 30A is completed when the tip 35a of the bent piece 35A comes into contact with the upper surface 15 of the wood material 10. This ensures that the cover thickness of the floor reinforcement 28 is guaranteed when the steel plate 30A is installed, without the need to measure the cover thickness of the floor reinforcement 28. As a result, the ease of installing the steel plate 30A into the slit 17 is significantly improved.

[0075] Furthermore, since the bent piece 35A is provided with through holes 39, the concrete filled when constructing the concrete slab 20 can flow downwards in the Y2 direction through the through holes 39, thereby preventing the formation of air pockets, which are areas of unfilled concrete, below the bent piece 35A.

[0076] On the other hand, steel plate 30B shown in Figure 6 differs from steel plates 30 and 30A in that, instead of having raised portions 36 formed by embossing as in steel plates 30 and 30A, it has raised portions 37 (burred portions) formed by burring.

[0077] In the steel plate 30B, burring-processed protrusions 37A and 37B are formed at different height levels on both wide surfaces 31A and 31B.

[0078] Here, Figure 6 shows a configuration where the bending angle is θ1 = 90 degrees, but as in Figure 5, a configuration with an acute angle of θ2 is also acceptable.

[0079] As mentioned above, burring is possible when the plate thickness t2 of steel plate 30B is 3.2 mm or less (such as 3.2 mm or 2.3 mm), so in this form as well, it is preferable to set the plate thickness t2 to 3.2 mm or 2.3 mm.

[0080] 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]

[0081] 10: Wood material 10A: Wood-based paneling (wood, cross-laminated timber, CLT) 10B: Wooden beam (wooden material, laminated board) 11: Solid wood 12: Saw board 13: Solid wood 15:Top surface 17: Slit 17a, 17b: Inner wall surface 20: Concrete slab 25: Bottom surface 30,30A,30B: Steel plate 31A, 31B: Wide surface 32: Embedded area 32a: Bottom end 33:Protruding area (shear key) 34: Folding part 35, 35A: Outward-extending piece (bent piece) 35a: Tip 36, 36A, 36B: Embossed area (raised area) 37, 37A, 37B: Burring process (protruding part) 38, 39: Through holes 40: Adhesive 50, 50A: Composite floor (composite material) 60, 60A: Composite beam (composite member) Q: Shear force S1: Bearing resistance force S2: Shear resistance S5,S6: Separation resistance

Claims

1. A composite member comprising a wood material and a concrete floor slab disposed on the upper surface of the wood material, The upper surface is provided with a slit of width t1, A steel plate having a thickness t2 that is thinner than the width t1 is provided with two or more protrusions projecting from both of its pair of wide surfaces, the embedded portion of the steel plate is inserted into the slit, and the two or more protrusions projecting in opposite directions each abut against a pair of opposing inner wall surfaces of the slit, thereby maintaining the embedded position and upright orientation of the steel plate relative to the slit. A composite member characterized in that an adhesive is filled into the slit, and a protruding region of the steel plate that protrudes from the slit acts as a shear key and is embedded in the concrete floor slab.

2. The composite member according to claim 1, characterized in that both of the pair of wide surfaces are provided with two or more protrusions at different height levels.

3. The composite member according to claim 1, characterized in that the shear key is provided with a separate protrusion or through hole.

4. The composite member according to claim 1, characterized in that the convex portion is an embossed portion on the wide surface.

5. The composite member according to claim 1, characterized in that the protrusion is a burring process portion on the wide surface.

6. The composite member according to claim 1, characterized in that the shear key is provided with a protruding piece that extends laterally, and the protruding piece is a means for resisting separation between the concrete slab and the wood material.

7. The protruding piece is a bent piece that extends in a direction perpendicular to the embedded area by bending the upper part of the steel plate. The composite member according to claim 6, characterized in that the length from the upper surface to the bent piece is set to the cover thickness of the floor reinforcement embedded in the concrete slab, and the floor reinforcement is placed on the bent piece.

8. The protruding piece is a bent piece that extends in a direction having an acute central angle with respect to the embedded area, due to the bending of the upper part of the steel plate. The composite member according to claim 6, characterized in that when the tip of the bent piece is brought into contact with the upper surface of the wood material, the length from the upper surface to the bent portion of the steel plate is set to the cover thickness of the floor reinforcement embedded in the concrete floor slab, and the floor reinforcement is placed on the bent portion.

9. The composite member according to claim 7 or 8, characterized in that the bent piece is provided with a through hole.

10. The composite member according to claim 1, characterized in that the wood material is one of the following: laminated timber, solid wood, structural plywood, laminated veneer timber, cross-laminated board, or nail-jointed laminated board.

11. The aforementioned wood material is a wood surface material, and the composite floor consists of the wood surface material and the concrete floor slab. The composite member according to claim 1, characterized in that the wood material is either a wooden beam or a composite beam consisting of the wooden beam and the concrete floor slab.

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