Composite bed structure and method for constructing the same

Abstract

To provide a composite floor structure that can be lightweight and thin in floor thickness.SOLUTION: A composite floor structure 1 is provided with steel beams 30 and woody plates 40. The steel beam 30 is provided with a lower flange 31 and an upper flange 32 extending in the horizontal direction and a web 33 extending in the vertical direction from the flanges 31 and 32. Side end faces 40A of the wood plate 40 are placed abutting against side faces of the web 33. A lateral protruding stud 35 is provided on the web 33 of the steel beam 30. A recess 44 into which a stud 35 is inserted is formed on the side end faces 40A of the wood plate 40, and the inside of the recess 44 is filled with a grout material 46.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a composite floor structure including a steel frame beam and a wooden board, and a construction method of this composite floor structure.

Background Art

[0002] Conventionally, there has been a composite floor structure combining a steel frame beam and a wooden board (see Patent Documents 1 to 3). Patent Document 1 shows a floor CLT structure including a steel frame beam, an orthogonal laminated board laid so that an edge is placed on the steel frame beam, and concrete placed and cured on the orthogonal laminated board so as to cover the upper surface and end surface of the orthogonal laminated board. Patent Document 2 shows a joining structure including a beam having studs protruding from the upper surface, a wooden floor slab supported by the beam and having through holes formed therein into which the studs are inserted, and slab concrete filled in the through holes of the wooden floor slab. Patent Document 3 shows a joining structure including a beam having bolts protruding from the upper surface, a wooden floor slab supported on the upper surface of the beam, and a steel plate fixed to the bolts and the wooden floor slab to transmit a horizontal force between the bolts and the wooden floor slab.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to provide a composite floor structure that is lightweight and can reduce the floor thickness, and a construction method thereof.

Means for Solving the Problems

[0005] The inventors of the present invention have reached the present invention by focusing on the fact that as a composite floor structure in which a steel frame beam and a wooden board are joined, by attaching the wooden board to the side surface of the web of the steel frame beam, it is lighter than a concrete floor structure, and the thickness of the floor structure can be reduced compared to a composite floor structure in which a wooden board is laid on the upper surface of the steel frame beam. The composite floor structure of the first invention (for example, the composite floor structures 1 and 1A described later) is a composite floor structure including a steel frame beam (for example, the steel frame beam 30 described later) and a wooden board (for example, the wooden board 40 described later), wherein the steel frame beam includes a flange extending in the horizontal direction (for example, the lower flange 31 and the upper flange 32 described later) and a web extending in the vertical direction from the flange (for example, the web 33 described later), the side end surface (for example, the side end surface 40A described later) of the wooden board is disposed in contact with the side surface of the web, a protruding portion protruding laterally (for example, the stud 35 described later) is provided on the web of the steel frame beam, a recess (for example, the recess 44 described later) into which the protruding portion is inserted is formed in the side end surface of the wooden board, and a filler (for example, the grout material 46 described later) is filled in the recess.

[0006] According to this invention, as a floor structure, since it is formed by attaching a wooden board to the side surface of the web of the steel frame beam, it can be made lighter than a reinforced concrete floor structure, and the floor thickness can be reduced compared to a composite structure in which a wooden board is placed on the steel frame beam. Further, by inserting the protruding portion provided on the web of the steel frame beam into the recess of the wooden board and filling the filler inside the recess, the gap around the protruding portion is blocked, and the steel frame beam and the wooden board are joined by single-sided shear joining of the protruding portion. Therefore, instead of the wet method of placing concrete at the construction site at the joint portion between the steel frame beam and the wooden board as in the conventional method, the dry method of integrating the steel frame beam and the wooden board at the factory is adopted, so that the integrity of the steel frame beam and the wooden board can be ensured in a short period.

[0007] The composite floor structure of the second invention further includes a reinforced concrete beam (for example, the main beam 20 described later) that supports the wooden board, and the beam is joined to the end of the steel beam and the end of the wooden board that is not joined to the steel beam (for example, the side end face 40B described later). According to this invention, since the end of the wooden board that is not joined to the steel beam is joined to the reinforced concrete beam, a composite floor structure in which the steel beam, the wooden board, and the reinforced concrete beam are joined can be realized.

[0008] The construction method of the composite floor structure of the third invention is a method of constructing the above-described composite floor structure, and includes preparing a composite floor panel in which the steel beam and the wooden board are integrated, erecting a temporary beam (for example, the temporary beam 61 described later), and placing the composite floor panel on the temporary beam (for example, steps S1 and S2 described later); a step of building a beam formwork (for example, the bottom formwork 62 and the side formwork 63 described later) along the side end face of the composite floor panel (for example, steps S3 and S4 described later); and a step of constructing a beam integrated with the composite floor panel by placing concrete inside the beam formwork (for example, step S5 described later).

[0009] According to this invention, by placing the composite floor panel on the temporary beam and supporting the composite floor panel from below with the temporary beam, and in this state, building a beam formwork along the side end face of the composite floor panel and placing concrete, the composite floor panel and the reinforced concrete beam can be easily integrated.

Effect of the Invention

[0010] According to the present invention, it is possible to provide a composite floor structure that is lightweight and has a thin floor thickness, and a construction method thereof.

Brief Description of the Drawings

[0011]

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Mode for Carrying Out the Invention

[0012] The present invention is a composite floor structure in which a wooden board is attached to the side surface of the web of a steel beam. In this composite floor structure, instead of laying a wooden board on the steel beam, the wooden board is installed on the side surface of the web that forms the beam of the steel beam and joined to the steel beam. According to the composite floor structure of the present invention, the thickness of the floor structure can be kept lower compared to the case where a wooden board is laid on the upper surface of the steel beam. Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the following embodiments, the same reference numerals are given to the same constituent elements, and the description thereof is omitted or simplified. FIG. 1 is a plan view of a composite floor structure 1 according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line I-I of the composite floor structure 1 of FIG. 1. FIG. 3 is a cross-sectional view taken along line II-II of the composite floor structure 1 of FIG. 1. The composite floor structure 1 includes a column 10, a large beam 20 made of reinforced concrete installed between the columns 10, a steel beam 30 which is a small beam made of steel and installed between the large beams 20, a wooden board 40 provided in a portion surrounded by the large beam 20 and the steel beam 30, and a frame member 50 made of steel or wood provided along the lower surface of the peripheral edge joined to the large beam 20 of the wooden board 40.

[0013] The steel beam 30 includes a lower flange 31 and an upper flange 32 extending in the horizontal direction, a web 33 connecting the lower flange 31 and the upper flange 32 and extending in the vertical direction, and a support flange 34 provided on the side surface of the web 33 and extending in the horizontal direction. On the upper side of the support flange 34 of the web 33 of the steel beam 30, studs 35 as protruding portions protruding laterally are provided at predetermined intervals along the length direction of the web 33 (see Fig. 4). Near the studs 35 of the web 33, air vent holes 36 are formed when filling the grout material described later. Also, on the lower side of the support flange 34 of the web 33 of the steel beam 30, bolt insertion holes 37 for connecting adjacent steel beams 30 with bolts are formed at predetermined intervals along the length direction of the web 33. High-strength bolts 38 are inserted into the bolt insertion holes 37 of adjacent steel beams 30, and nuts 39 are tightened. By the friction joint with these high-strength bolts, adjacent steel beams 30 are connected (see Fig. 3 and Fig. 8).

[0014] The wooden board 40 is rectangular in plan view and includes a CLT (Cross Laminated Timber) 41 in which 7 layers of veneers are laminated, a wooden formwork plywood 42 laminated on the CLT 41, and a wooden ceiling base 43 provided on the lower surface of the CLT 41. Hereinafter, the side end face of the wooden board 40 joined to the steel beam 30 is defined as the side end face 40A, and the remaining side end face joined to the large beam 20 (the side end face of the wooden board 40 not joined to the steel beam 30) is defined as the side end face 40B. The side end face 40A of the wooden board 40 is arranged in contact with the side face of the web 33 of the steel frame beam 30, and the end of the CLT 41 of the wooden board 40 on the side end face 40A side is interposed between the support flange 34 and the upper flange 32 of the steel frame beam 30. Further, the upper surface of the formwork plywood 42 is flush with the upper surface of the upper flange 32 of the steel frame beam 30. Further, the lower surface of the ceiling base material 43 and the lower surface of the frame material 50 are flush with the lower surface of the lower flange 31 of the steel frame beam 30.

[0015] A recess 44 into which the stud 35 of the steel frame beam 30 is inserted is formed in the side end face 40A of the wooden board 40. Further, a grout injection hole 45 leading from the outside to the recess 44 is formed in the lower surface of the wooden board 40. With the stud 35 of the steel frame beam 30 inserted into the recess 44, grout material 46 as a filling material is filled into the recess 44 through the grout injection hole 45, whereby the wooden board 40 is joined to the steel frame beam 30 and integrated. Further, the side end face 40B of the wooden board 40 is subjected to waterproof painting, and female screw portions 47 are embedded at predetermined intervals along the length direction of the side end face 40B (see Fig. 4).

[0016] The end of the steel frame beam 30 and the side end face 40B, which is the end of the wooden board 40 not joined to the steel frame beam 30, are joined to the main beam 20. The main beam 20 is provided with a jaw portion 21 that supports the frame material 50 constituting the side end face 40B of the wooden board 40 from below. This main beam 20 includes a main beam main reinforcement 22, stirrups 23 provided to surround the main beam main reinforcement 22, additional reinforcement 24 arranged in the jaw portion 21, and a concrete body 25 in which the main beam main reinforcement 22, stirrups 23, and additional reinforcement 24 are embedded. A bolt (lag screw bolt) 48 is screwed into the female screw portion 47 of the wooden board 40, and by embedding this bolt 48 in the concrete body 25 of the main beam 20, the wooden board 40 is joined to the main beam 20. In this embodiment, the female screw portion 47 is provided on the side end face 40B of the wooden board 40 and the bolt 48 is screwed into the female screw portion 47, but it is not limited to this, and flat steel or shaped steel protruding laterally may be provided on the side end face 40B of the wooden board 40.

[0017] In the present invention, a steel frame beam 30, a wooden board 40, and a frame material 50 are integrated into a composite floor panel 60, and the composite floor panel 60 is laid and integrated with a large beam 20 made of reinforced concrete to construct a composite floor structure 1. FIG. 4 is a plan view of the composite floor panel 60. FIG. 5 is a sectional view taken along line III-III of the composite floor panel 60 in FIG. 4. FIG. 6 is a sectional view taken along line IV-IV of the composite floor panel 60 in FIG. 4. In the composite floor panel 60, the studs 35 of the steel frame beam 30 are inserted into the recesses 44 of the wooden board 40. In this state, grout material 46 as a filling material is injected from the grout injection holes 45 provided on the lower surface of the wooden board 40 to fill the recesses 44. The injection of the grout material 46 is performed until the grout material 46 overflows from the air vent holes 36. Thereby, the wooden board 40 is joined to the steel frame beam 30.

[0018] Hereinafter, the procedure for constructing the composite floor structure 1 using the composite floor panel 60 will be described with reference to the flowchart in FIG. 7. That is, in step S1, as shown in FIGS. 8 and 9, a temporary beam 61 for supporting the composite floor panel 60 is erected, and the composite floor panel 60 is arranged on the temporary beam 61. Thereby, the side end surface 40B of the wooden board 40 of the composite floor panel 60 will be located on the side surface of the large beam 20 (see FIG. 10). In step S2, as shown in FIGS. 8 and 9, adjacent composite floor panels 60 are connected to each other. Specifically, high-strength bolts 38 are inserted into the bolt insertion holes 37 of the steel frame beams 30 of adjacent composite floor panels 60, and nuts 39 are tightened to connect adjacent composite floor panels 60 to each other.

[0019] In step S3, as shown in FIG. 10, a bottom formwork 62 of the large beam 20 is built along the side end surface 40B of the composite floor panel 60, and the large beam 20 and the reinforcement of the jaw part 21 are arranged. Specifically, the main beam reinforcement 22 and the stirrup 23 are assembled on the ground, and the assembled main beam reinforcement 22 and stirrup 23 are dropped onto the bottom formwork 62 of the large beam 20. Thereafter, the bent-up bars 24 are arranged. In step S4, as shown in FIG. 11, the side formwork 63 of the girder 20 is erected. Then, a bolt 48 is screwed into the female screw portion 47 of the side end face 40B of the composite floor panel 60. In step S5, by placing concrete inside the bottom formwork 62 and the side formwork 63, the girder 20 is constructed integrally with the composite floor panel 60. At this time, the side end face 40B of the wooden board 40 with the waterproof coating functions as a beam formwork. Then, the side formwork 63, the bottom formwork 62, and the temporary beam 61 are disassembled.

[0020] According to this embodiment, there are the following effects. (1) As the composite floor structure 1, since the wooden board 40 is attached to the side surface of the web 33 of the steel beam 30, it can be made lighter than a reinforced concrete floor structure, and the floor thickness can be made thinner than a composite structure in which a wooden board is placed on a steel beam. Also, the stud 35 provided on the web 33 of the steel beam 30 is inserted into the recess 44 of the wooden board 40, and the gap around the stud 35 is filled with grout material 46 to block the gap around the stud 35, and the steel beam 30 and the wooden board 40 are joined by single-sided shear joining of the stud 35. Therefore, instead of the wet method of placing concrete at the construction site at the joint portion between the steel beam and the wooden board as in the conventional method, the dry method of integrating the steel beam and the wooden board at the factory is adopted, so that the integrity between the steel beam and the wooden board can be ensured in a short period. In addition, since the steel beams 30 of adjacent composite floor panels 60 are joined by high-strength bolt friction joining with high-strength bolts 38 and nuts 39, adjacent composite floor panels 60 can be firmly integrated.

[0021] (2) Since the side end face 40B of the wooden board 40 that is not joined to the steel frame beam is joined to the side face of the large beam 20 made of reinforced concrete, a composite floor structure 1 in which the steel frame beam 30, the wooden board 40, and the large beam 20 are integrated can be realized. Also, in the composite floor structure 1, after the composite floor panel 60 is attached in advance, the end portion of the composite floor panel 60 is disposed inside the large beam 20 beam forms 62, 63, and concrete is placed in this state. Therefore, compared with the case where the large beam made of reinforced concrete is constructed in advance and then the composite floor panel is joined to this large beam, the formwork material can be reduced, and the composite floor panel 60 and the large beam 20 can be integrated. (3) By supporting the composite floor panel 60 from below with the temporary beam 61 and, in this state, building the bottom form 62 and the side form 63 along the side end face 40B of the composite floor panel 60 and placing concrete, the composite floor panel 60 and the large beam 20 can be easily integrated. (4) Instead of manufacturing the composite floor panel 60 at the construction site, at the factory, H-shaped steel or C-shaped steel is used as the steel frame beam 30, and the wooden board 40 is joined to this steel frame beam 30 for manufacturing and then transported to the construction site, thereby shortening the construction period.

[0022] 〔Second Embodiment〕 FIG. 12 is a longitudinal cross-section of a composite floor structure 1A according to the second embodiment of the present invention. In this embodiment, the floor of this floor is a vibration-isolation double floor, and the ceiling of the lower floor is a sound-insulating ceiling, which is different from the first embodiment. That is, three layers of reinforced gypsum boards 70 are laminated on the upper surfaces of the large beam 20, the steel frame beam 30, and the wooden board 40. Support legs 71 are disposed on the upper surface of the laminated reinforced gypsum boards 70, and a floor material 72 is installed on the support legs 71. Also, three layers of reinforced gypsum boards 80 are laminated on the lower surfaces of the steel frame beam 30 and the wooden board 40. Suspension bolts 81 are attached to the ceiling base 43, and the suspension bolts 81 penetrate the reinforced gypsum boards 80 and extend downward. A ceiling material 82 is supported by the suspension bolts 81, and a sound-insulating material 83 is provided on the back side of the ceiling of the ceiling material 82. According to this embodiment, there are the same effects as those of the above (1) to (4).

[0023] Note that the present invention is not limited to the above-described embodiments, and modifications, improvements, etc. within the scope that can achieve the object of the present invention are included in the present invention. For example, in each of the above-described embodiments, the temporary beam 61 was installed, and after the composite floor panel 60 was disposed on the temporary beam 61, the bottom formwork 62 of the main beam 20 was constructed. However, the present invention is not limited thereto. After the bottom formwork 62 of the main beam 20 is constructed, the temporary beam 61 may be installed, and the composite floor panel 60 may be disposed and the reinforcement of the main beam 20 may be performed. Also, in each of the above-described embodiments, the stud 35 was provided as a protruding portion on the web 33 of the steel beam 30. However, the present invention is not limited thereto, and a flat steel or a shaped steel may be provided as the protruding portion. Further, in each of the above-described embodiments, the grout material 46 was injected from the grout injection hole 45 provided on the lower surface of the wooden board 40 into the recess 44 of the wooden board 40, and the air was vented from the air vent hole 36. However, the present invention is not limited thereto. The grout material 46 may be injected from the air vent hole 36 shown in FIG. 3 into the recess 44 of the wooden board 40, and the air may be vented from the grout injection hole 45 shown in FIG. 3.

Explanation of Reference Numerals

[0024] 1, 1A... Composite floor structure 10... Column 20... Main beam 21... Jaw portion 22... Main beam reinforcement 23... Stirrup 24... Bent-up bar 25... Concrete body 30... Steel beam 31... Lower flange 32... Upper flange 33... Web 34... Support flange 35... Stud (protruding portion) 36... Air vent hole 37... Bolt insertion hole 38... High-strength bolt 39... Nut 40... Wooden board 40A... Side end face of the wooden board joined to the steel beam 40B... Side end face of the wooden board joined to the main beam (end portion of the wooden board not joined to the steel beam) 41... CLT 42... Formwork plywood 43... Ceiling base 44... Recess 45... Grout injection hole 46... Grout material (filling material) 47... Female thread portion 48... Bolt 50... Frame material 60... Composite floor panel 61... Temporary beam 62... Bottom formwork (beam formwork) 63... Side formwork (beam formwork) 70... Reinforced gypsum board 71... Support leg 72... Floor material 80... Reinforced gypsum board 81... Bolt 82... Ceiling material 83... Sound insulation material

Claims

1. A composite floor structure comprising a steel frame beam and a wooden board, The steel frame beam includes upper and lower flanges extending in the horizontal direction, and a web connecting the upper and lower flanges and extending in the vertical direction, The side end face of the wooden board is arranged in contact with the side face of the web, The wooden board is composed of a CLT formed by laminating veneers, The entire side end face of the CLT of the wooden board is sandwiched between the upper and lower flanges, A protruding portion protruding laterally is provided on the web of the steel frame beam, A recess into which the protruding portion is inserted is formed on the side end face of the CLT of the wooden board, A composite floor structure, characterized in that a filler is filled inside the recess.

2. Further comprising a reinforced concrete beam for supporting the wooden board, The composite floor structure according to claim 1, characterized in that the ends of the steel frame beam and the ends of the wooden board not joined to the steel frame beam are joined to the beam.

3. A method for constructing a composite floor structure comprising a steel frame beam, a reinforced concrete beam, and a wooden board, The end of the wooden board is joined to the steel frame beam, The ends of the steel frame beam and the ends of the wooden board not joined to the steel frame beam are joined to the reinforced concrete beam, The steel frame beam includes a flange extending in the horizontal direction and a web extending in the vertical direction from the flange, The side end face of the wooden board is arranged in contact with the side face of the web, A protruding portion protruding laterally is provided on the web of the steel frame beam, A recess into which the protruding portion is inserted is formed on the side end face of the wooden board, A filler is filled inside the recess, Preparing a composite floor panel integrating the steel frame beam and the wooden board, erecting a temporary beam, and arranging the composite floor panel on the temporary beam; Constructing a beam formwork along the side end face of the composite floor panel; A method for constructing a composite floor structure, comprising constructing a beam integrally with the composite floor panel by placing concrete inside the beam formwork.

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