JP2023057486A - Composite floor structure and method of constructing the same - Google Patents

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 The present invention relates to a composite floor structure comprising steel beams and wooden boards, and a method for constructing this composite floor structure.

Conventionally, there are composite floor structures that combine steel beams and wooden boards (see Patent Documents 1 to 3).
In Patent Document 1, a steel beam, an orthogonal laminated board laid so that the edge rests on the steel beam, and an orthogonal laminated board so as to cover the upper surface and end face of the orthogonal laminated board and hardened. A floor CLT structure is shown with reinforced concrete.
Patent Document 2 discloses a beam having a stud protruding from the upper surface, a wooden floor slab supported by the beam and formed with a through-hole into which the stud is inserted, a slab concrete filled in the through-hole of the wooden floor slab, is shown.
Patent Document 3 discloses a beam with a bolt protruding from the upper surface, a wooden floor slab supported on the upper surface of the beam, and a bolt and the wooden floor slab fixed to transmit horizontal force between the bolt and the wooden floor slab. A joint structure with steel plates is shown.

JP 2020-105694 A JP 2019-31787 A JP 2019-39177 A

SUMMARY OF THE INVENTION An object of the present invention is to provide a composite floor structure that is lightweight and has a thin floor thickness, and a construction method thereof.

The present inventors have developed a composite floor structure in which steel beams and wooden boards are joined together. The inventors have focused on the point that the thickness of the floor structure can be made thinner compared to the composite floor structure in which wooden boards are laid on the upper surface of the beams, and have arrived at the present invention.
The composite floor structure of the first invention (for example, the composite floor structures 1 and 1A described later) is a composite floor comprising a steel beam (for example, a steel beam 30 described later) and a wood board (for example, a wood board 40 described later). The structure, wherein the steel beams include horizontally extending flanges (for example, a lower flange 31 and an upper flange 32 to be described later) and webs extending vertically from the flanges (for example, a web 33 to be described later). The side end faces of the wooden board (for example, the side end faces 40A to be described later) are arranged in contact with the side faces of the web, and the web of the steel beam is provided with a projecting portion (for example, a stud to be described later) protruding to the side. 35) is provided, and a recess (for example, a recess 44 described later) into which the projecting portion is inserted is formed on the side end surface of the wooden board, and a filler (for example, grout described later) is provided inside the recess. It is characterized by being filled with material 46).

According to this invention, since the floor structure is formed by attaching the wooden boards to the side surfaces of the web of the steel beams, the weight can be reduced compared to the reinforced concrete floor structure, and the wooden boards are placed on the steel beams. The floor thickness can be made thinner compared to the composite structure.
In addition, by inserting the protrusion provided on the web of the steel beam into the recess of the wooden board and filling the inside of this recess with a filler material, the gap around the protrusion is closed and the steel frame is joined by one-sided shear bonding of the protrusion. Join beams and wooden boards. Therefore, instead of the conventional wet construction method in which concrete is placed at the construction site at the joint between the steel frame beam and the wooden board, a dry construction method that integrates the steel frame beam and the wooden board at the factory is adopted. and the wooden board can be secured in a short period of time.

The composite floor structure of the second invention further comprises reinforced concrete beams (for example, large girders 20 described later) that support the wooden boards, and the beams include the ends of the steel beams and the steel beams of the wooden boards. It is characterized in that an end portion (for example, a side end face 40B described later) that is not joined to the edge is joined.
According to this invention, since the ends of the wooden boards that are not joined to the steel beams are joined to the reinforced concrete beams, a composite floor structure in which the steel beams, the wooden boards, and the reinforced concrete beams are joined can be realized.

A method for constructing a composite floor structure according to a third aspect of the invention is a method for constructing the above-described composite floor structure, wherein a composite floor panel in which the steel beams and the wooden boards are integrated is prepared, and temporary beams (for example, , a step of constructing a temporary beam 61) described later and arranging the composite floor panel on the temporary beam (for example, steps S1 and S2 described later); The step of erecting a frame (for example, the bottom formwork 62 and the side formwork 63 to be described later) (for example, steps S3 and S4 to be described later) and placing concrete inside the beam formwork, the composite floor and a step of building a beam integrated with the panel (for example, step S5 described later).

According to this invention, the composite floor panel is placed on the temporary beam, the composite floor panel is supported from below by the temporary beam, and in this state, the beam formwork is erected along the side end face of the composite floor panel. The composite floor panel and the reinforced concrete beam can be easily integrated by pouring the concrete.

ADVANTAGE OF THE INVENTION According to this invention, the composite floor structure which can be light weight and can make a floor thickness thin, and its construction method can be provided.

1 is a plan view of a composite floor structure according to a first embodiment of the present invention; FIG. 2 is a cross-sectional view of the composite floor structure of FIG. 1 taken along line II. FIG. FIG. 2 is a cross-sectional view of the composite floor structure of FIG. 1 taken along line II-II; 1 is a plan view of a composite floor panel making up a composite floor structure; FIG. Figure 5 is a cross-sectional view III-III of the composite floor panel of Figure 4; Figure 5 is a cross-sectional view IV-IV of the composite floor panel of Figure 4; 4 is a flow chart of a procedure for constructing a composite floor structure; 1 is an explanatory diagram of a construction procedure of a composite floor structure (No. 1, plan view showing arrangement of composite floor panels); FIG. FIG. 10 is an explanatory view of the construction procedure of the composite floor structure (No. 2, vertical cross-sectional view of joints between composite floor panels); It is an explanatory view of the construction procedure of the composite floor structure (No. 3, longitudinal sectional view showing the state where the bottom formwork of the girders is erected). FIG. 10 is an explanatory drawing of the construction procedure of the composite floor structure (No. 4, a vertical cross-sectional view showing a state in which the side formwork of the girders is erected). 4 is a longitudinal section of a composite floor structure according to a second embodiment of the invention;

The present invention is a composite floor structure in which wooden boards are attached to the sides of a web of steel beams. In this composite floor structure, instead of laying wooden boards on the steel beams, wooden boards were installed on the side of the web, which was the beam of the steel beams, and joined to the steel beams. According to the composite floor structure of the present invention, the thickness of the floor structure can be kept low compared to the case where wooden boards are laid on the upper surfaces of steel beams.
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. In the following description of the embodiments, the same components are denoted by the same reference numerals, and the description thereof will be omitted or simplified.
FIG. 1 is a plan view of a composite floor structure 1 according to a first embodiment of the invention. FIG. 2 is a cross-sectional view of the composite floor structure 1 of FIG. 1 taken along line II. FIG. 3 is a II-II sectional view of the composite floor structure 1 of FIG.
The composite floor structure 1 includes columns 10, reinforced concrete girders 20 erected between the pillars 10, steel beams 30 which are small steel girders erected between the girders 20, the girders 20 and A wooden plate 40 provided in a portion surrounded by the steel beams 30, and a steel or wooden frame member 50 provided along the lower surface of the peripheral portion of the wooden plate 40 joined to the girders 20. Prepare.

The steel beam 30 includes a horizontally extending lower flange 31 and an upper flange 32, a vertically extending web 33 connecting the lower flange 31 and the upper flange 32, and a side surface of the web 33 extending horizontally. a support flange 34;
Above the support flange 34 in the web 33 of the steel frame beam 30, studs 35 are provided as projecting portions that project sideways at predetermined intervals along the length direction of the web 33 (see FIG. 4). ). In the vicinity of the stud 35 of the web 33, an air vent hole 36 is formed for filling with a grout material, which will be described later.
Bolt insertion holes 37 for connecting the adjacent steel beams 30 with bolts are provided on the lower side of the support flange 34 of the web 33 of the steel beams 30 at predetermined intervals along the length direction of the web 33 . is formed. High-strength bolts 38 are inserted through the bolt insertion holes 37 of the adjacent steel beams 30, and nuts 39 are tightened. Adjacent steel beams 30 are connected to each other by frictional joining with the high-strength bolts (see FIGS. 3 and 8).

The wooden board 40 has a rectangular shape in a plan view, and includes a CLT (Cross Laminated Timber) 41 in which seven layers of sawn board (lamina) are laminated, a wooden form plywood 42 laminated on the CLT 41, and the CLT 41. and a wooden ceiling base 43 provided on the lower surface.
Hereinafter, the side end surface of the wood plate 40 joined to the steel beam 30 is referred to as a side end surface 40A, and the side end surface of the remaining girders 20 (the side end surface of the wood plate 40 that is not bonded to the steel beam 30) is referred to as a side end surface 40B. do.
The side end surface 40A of the wooden board 40 is arranged in contact with the side surface of the web 33 of the steel beam 30, and the end of the wooden board 40 on the side end surface 40A side of the CLT 41 is connected to the support flange 34 of the steel beam 30. It is interposed between it and the upper flange 32 . In addition, the upper surface of the formwork plywood 42 is flush with the upper surface of the upper flange 32 of the steel beam 30 . In addition, the lower surface of the ceiling base 43 and the lower surface of the frame member 50 are flush with the lower surface of the lower flange 31 of the steel beam 30 .

A recess 44 into which the stud 35 of the steel frame beam 30 is inserted is formed in the side end surface 40A of the wooden plate 40 . A grout injection hole 45 is formed in the lower surface of the wooden board 40 to reach the recess 44 from the outside. With the stud 35 of the steel beam 30 inserted into the recess 44 , the recess 44 is filled with a grout material 46 as a filler through the grout injection hole 45 , thereby joining the wooden board 40 to the steel beam 30 . are integrated.
The side end surface 40B of the wooden board 40 is coated with a waterproof coating, and female threads 47 are embedded at predetermined intervals along the length direction of the side end surface 40B (see FIG. 4).

The girders 20 are joined to the ends of the steel beams 30 and the side end faces 40B, which are the ends of the wood plates 40 not joined to the steel beams 30 . The girders 20 are provided with jaws 21 that support the frame members 50 forming the side end faces 40B of the wooden boards 40 from below. The girders 20 are composed of main beam reinforcements 22, stirrups 23 provided surrounding the main beam reinforcements 22, plinths 24 arranged in the jaw 21, and these main beams 22, stirrups 23, and plinths 24. and an embedded concrete body 25 .
A bolt (lag screw bolt) 48 is screwed into the female threaded portion 47 of the wooden plate 40 , and the wooden plate 40 is joined to the large beam 20 by embedding the bolt 48 in the concrete body 25 of the large beam 20 . there is In the present embodiment, the female threaded portion 47 is provided on the side end surface 40B of the wooden board 40, and the bolt 48 is screwed into the female threaded portion 47. However, the present invention is not limited to this. Protruding flat steel or section steel may be provided.

In the present invention, the composite floor panel 60 is formed by integrating the steel beam 30, the wooden board 40, and the frame member 50, and the composite floor panel 60 is laid and integrated with the reinforced concrete girder 20 to form a composite floor structure. build 1.
4 is a plan view of composite floor panel 60. FIG. FIG. 5 is a cross-sectional view of the composite floor panel 60 of FIG. 4 taken along line III-III. FIG. 6 is a cross-sectional view IV-IV of the composite floor panel 60 of FIG.
In the composite floor panel 60, the studs 35 of the steel beams 30 are inserted into the recesses 44 of the wooden board 40, and in this state, the grout material 46 as a filler is injected from the grout injection hole 45 provided on the lower surface of the wooden board 40. to fill the recess 44 . The injection of the grout material 46 is performed until the grout material 46 overflows from the air vent hole 36 . As a result, the wooden board 40 is joined to the steel beam 30 .

The procedure for constructing the composite floor structure 1 using the composite floor panel 60 will be described below with reference to the flowchart of FIG.
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. FIG. As a result, the side end surface 40B of the wooden board 40 of the composite floor panel 60 is positioned on the side surface of the girder 20 (see FIG. 10).
In step S2, as shown in FIGS. 8 and 9, adjacent composite floor panels 60 are connected. Specifically, the adjacent composite floor panels 60 are connected by inserting the high-strength bolts 38 into the bolt insertion holes 37 of the steel beams 30 of the adjacent composite floor panels 60 and tightening the nuts 39 .

In step S3, as shown in FIG. 10, the bottom formwork 62 of the girders 20 is erected along the side end faces 40B of the composite floor panel 60, and the reinforcement of the girders 20 and jaws 21 is arranged. Specifically, the beam main reinforcements 22 and the stirrups 23 are assembled, and the beam main reinforcements 22 and the stirrups 23 are dropped onto the bottom formwork 62 of the girders 20 . After that, puffs 24 are arranged.
In step S4, as shown in FIG. 11, the side formwork 63 of the girders 20 is erected. After that, the bolt 48 is screwed into the female screw portion 47 of the side end surface 40B of the composite floor panel 60 .
In step S<b>5 , concrete is placed inside the bottom formwork 62 and the side formwork 63 to integrate them with the composite floor panel 60 to construct the girders 20 . At this time, the side end surfaces 40B of the wooden board 40 to which the waterproof coating is applied function as a beam formwork. After that, the side molds 63, the bottom molds 62, and the temporary beams 61 are dismantled.

According to this embodiment, there are the following effects.
(1) Since the composite floor structure 1 is formed by attaching the wooden boards 40 to the side surfaces of the webs 33 of the steel beams 30, the weight can be reduced compared to the reinforced concrete floor structure. The floor thickness can be reduced compared to a mounted composite structure.
Further, by inserting the studs 35 provided on the webs 33 of the steel beams 30 into the recesses 44 of the wooden board 40 and filling the interiors of the recesses 44 with the grout material 46, the gaps around the studs 35 are closed and the studs 35 are The steel frame beam 30 and the wood plate 40 are joined by single-sided shear joining. Therefore, instead of the conventional wet construction method in which concrete is placed at the construction site at the joint between the steel frame beam and the wooden board, a dry construction method that integrates the steel frame beam and the wooden board at the factory is adopted. and the wooden board can be secured in a short period of time. In addition, since the steel beams 30 of the adjacent composite floor panels 60 are joined together by high-strength bolt friction bonding using the high-strength bolts 38 and nuts 39, the adjacent composite floor panels 60 can be firmly integrated.

(2) A composite floor structure in which the steel beams 30, the wooden boards 40, and the girders 20 are integrated because the side end surfaces 40B of the wooden boards 40 that are not joined to the steel girders are joined to the side surfaces of the girders 20 of reinforced concrete construction. 1 can be realized. In the composite floor structure 1, after the composite floor panel 60 is installed first, the ends of the composite floor panel 60 are placed inside the beam forms 62 and 63 of the girders 20, and concrete is placed in this state. Therefore, it is possible to reduce the number of formwork materials compared to the case where the reinforced concrete girders are first constructed and then the composite floor panels are joined to the girders, and the composite floor panel 60 and the girders 20 are integrated. can be made
(3) The composite floor panel 60 is supported from below by the temporary beams 61, and in this state, the bottom formwork 62 and the side formwork 63 are erected along the side end surfaces 40B of the composite floor panel 60, and concrete is poured. Thus, the composite floor panel 60 and the girders 20 can be easily integrated.
(4) The composite floor panel 60 is not manufactured at a construction site, but is manufactured at a factory by using H-shaped steel or U-shaped steel materials as steel beams 30 and joining wooden boards 40 to the steel beams 30. It is possible to shorten the construction period by carrying it to the construction site.

[Second embodiment]
FIG. 12 is a longitudinal section of a composite floor structure 1A according to the second embodiment of the invention.
This embodiment differs from the first embodiment in that the floor of the current floor is a double anti-vibration floor and the ceiling of the lower floor is a sound insulation ceiling.
That is, three layers of reinforced gypsum boards 70 are laminated on the upper surfaces of the girders 20, the steel beams 30, and the wooden boards 40, and supporting legs 71 are arranged on the upper surfaces of the laminated reinforced gypsum boards 70. A floor material 72 is installed on the support leg 71 .
Three layers of reinforced gypsum boards 80 are laminated on the lower surfaces of the steel beams 30 and the wooden boards 40 . Hanging bolts 81 are attached to the ceiling base 43 , and the hanging bolts 81 extend downward through the reinforced gypsum board 80 . A ceiling material 82 is supported by the hanging 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, the same effects as (1) to (4) described above are obtained.

It should be noted that the present invention is not limited to the above-described embodiments, and includes modifications, improvements, etc. within the scope of achieving the object of the present invention.
For example, in each of the above-described embodiments, the temporary beams 61 were erected, and after the composite floor panel 60 was placed on the temporary beams 61, the bottom formwork 62 of the girders 20 was erected. After erecting the bottom formwork 62 of 20, the temporary girders 61 may be constructed, and the composite floor panels 60 may be arranged and the reinforcing bars of the girders 20 may be arranged.
Further, in each of the above-described embodiments, the studs 35 are provided on the webs 33 of the steel beams 30 as projecting portions, but the present invention is not limited to this, and flat steel or shaped steel may be provided as projecting portions.
Further, in each of the above-described embodiments, the grouting material 46 is injected into the recessed portion 44 of the wooden board 40 through the grout injection hole 45 provided on the lower surface of the wooden board 40, and the air is removed from the air vent hole 36. However, the present invention is not limited to this. Alternatively, the grouting material 46 may be injected into the recessed portion 44 of the wooden board 40 through the air vent hole 36 shown in FIG.

DESCRIPTION OF SYMBOLS 1, 1A... Composite floor structure 10... Column 20... Large beam 21... Jaw 22... Beam main reinforcement 23... Stirrup 24... Reinforcement 25... Concrete body 30... Steel beam 31... Lower flange 32... Upper flange 33... Web 34... Support flange 35 Stud (projection) 36 Air vent hole 37 Bolt insertion hole 38 High-strength bolt 39 Nut 40 Wooden board 40A Side end face joined to steel beam of wooden board 40B Large beam of wooden board Side end faces to be joined (ends not joined to steel beams of wooden boards)
DESCRIPTION OF SYMBOLS 41... CLT 42... Formwork plywood 43... Ceiling foundation 44... Recess 45... Grout injection hole 46... Grout material (filler) 47... Female screw part 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 insulating material

Claims (3)

A composite floor structure comprising steel beams and wooden boards,
the steel beam includes a horizontally extending flange and a web extending vertically from the flange;
a side end surface of the wooden board is arranged in contact with a side surface of the web;
The web of the steel beam is provided with a projecting portion projecting sideways,
A concave portion into which the protruding portion is inserted is formed in a side end surface of the wooden board,
The composite floor structure, wherein the interior of the recess is filled with a filler. Further comprising a reinforced concrete beam that supports the wooden board,
2. The composite floor structure according to claim 1, wherein the ends of the steel beams and the ends of the wood plates not joined to the steel beams are joined to the beams. A method of constructing a composite floor structure according to claim 2, comprising:
a step of preparing a composite floor panel in which the steel beam and the wooden board are integrated, erecting a temporary beam, and arranging the composite floor panel on the temporary beam;
erecting a beam formwork along a side end face of the composite floor panel;
A method of constructing a composite floor structure, comprising a step of constructing a beam integrated with the composite floor panel by placing concrete inside the beam formwork.

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