JP7163527B1 - Floor slab structure and lateral buckling stiffening method for floor slab structure - Google Patents

Abstract

A floor slab structure and a lateral buckling stiffening method for a floor slab structure capable of suppressing lateral buckling, shortening a construction period due to labor saving, and suppressing influence on an interior. SOLUTION: A floor slab structure 1 includes a large beam 2, a prestressed concrete composite floor 6 spanned between the facing large girders 2, and a brace member connected to the prestressed concrete composite floor 6 and the large girders 2. 13 and cast-in-place concrete 19 placed on the upper surface of the prestressed concrete composite floor 6, and the prestressed concrete composite floor 6 and the girders 2 are united by the cast-in-place concrete 19 together with the girders studs 23 and the bracket studs 24. , and no small girders are spanned between the large girders 2 . [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to a floor slab structure and a lateral buckling stiffening method for the floor slab structure.

Conventionally, it has been required to supplement the rigidity that does not cause lateral buckling as the lateral stiffening of the steel-framed girders. When the horizontal force transmitted from the slab placed on the steel beam is transmitted to the steel beam, the steel beam is bent around its strong axis, and the compression side protrudes out of the plane, causing lateral buckling. As a method for suppressing lateral buckling, for example, a small beam is used in a floor formation method described in Patent Document 1 below (hereinafter referred to as "publicly known document 1 invention"). In the invention disclosed in Document 1, small girders are spanned over large girders spanned over columns, and slabs are formed on these girders.

JP 2010-265689 A

However, if small beams are used, the steel frame material will increase, and the processing and construction of the small beams will be required. In addition, the small beams occupy the space required for lighting, air-conditioning, and other facilities in the ceiling, and thus affect the interior decoration.

The present invention has been proposed in view of the above circumstances. SUMMARY OF THE INVENTION An object of the present invention is to provide a floor slab structure and a method for stiffening the floor slab structure for lateral buckling, which can suppress lateral buckling, shorten the construction period due to labor saving, and suppress influence on the interior.

In order to achieve the above object, the floor slab structure according to the present invention comprises a girder having a joint member at its upper end, a prestressed concrete composite floor that spans between the facing girders, and the prestressed concrete composite floor. Concrete that is cast on the upper surface of the floor and integrates the large girders and the prestressed concrete composite floor together with the joining members, and does not have small girders between the large girders. and

In the floor slab structure according to the present invention, PC steel wires protrude from the ends of the prestressed concrete composite floor, and the ends of the girders are placed facing each other with a gap therebetween at the upper ends of the girders. Each of the PC steel wires of the prestressed concrete composite floor is connected by a connecting member.

The floor slab structure according to the present invention has a brace member having a first end attached to an opening formed in the prestressed concrete composite floor and a second end attached to the girders, It is characterized by

In the floor slab structure according to the present invention, a stud is provided on the upper surface of the first end, the second end is attached to a gusset plate provided on the girder, and the stud passes through the opening. and integrated with the concrete.

A method for stiffening lateral buckling of a floor slab structure according to the present invention comprises a girder having girders studs at its upper ends, a prestressed concrete composite floor having openings near its ends, and a brace at one end. A lateral buckling stiffening method for a floor slab structure using longitudinal brace members provided with studs, comprising: placing an end of a prestressed concrete composite floor on the upper end of the girders; The first end, which is one end, is attached to the opening from the lower surface side of the prestressed concrete composite floor, and the stud stud is passed through the opening to be exposed on the upper surface of the prestressed concrete composite floor, and , a step of attaching the second end, which is the other end of the brace member, to a gusset plate provided on the girders; and integrating the girders and the prestressed concrete composite floor together with the girders studs and the bracket studs.

The floor slab structure according to the present invention includes a girder having a joint member at its upper end, a prestressed concrete composite floor that spans between the facing girders, and a prestressed concrete composite floor that is placed on the upper surface and jointed. It has concrete that integrates the girders and the prestressed concrete composite floor together with the members, and does not have small girders between the girders. That is, the prestressed concrete composite floor and the girders are integrated with concrete together with the joining members to form a composite structure. Therefore, the present invention can suppress lateral buckling without requiring small beams between large beams. In addition, since no small beams are required, labor can be saved, the construction period can be shortened, and the impact on the interior can be suppressed.

In the floor slab structure according to the present invention, PC steel wires protrude from the ends of the prestressed concrete composite floor, and a plurality of prestressed concrete composite floors are placed on the upper end of the girders so that the ends face each other with a space therebetween. are connected by connecting members. That is, since the PC steel wires are connected by the connecting member, the rigidity is increased and the resistance to lateral buckling is improved.

The floor slab structure according to the invention comprises a brace member having a first end attached to an opening formed in a prestressed concrete composite floor and a second end attached to a girder. The brace members provide additional stiffness against horizontal forces on the girders. Therefore, the present invention can suppress lateral buckling. In addition, compared to the case where small beams are provided between large beams, labor can be saved, the construction period can be shortened, and the influence on the interior can be suppressed.

In the floor slab structure according to the present invention, a stud is provided on the upper surface of the first end, the second end is attached to a gusset plate provided on the girders, and the stud penetrates through the opening and is integrated with the concrete. It has become. With this configuration, the prestressed concrete composite floor and the square member are integrated with the concrete through the studs. Therefore, the present invention can suppress lateral buckling.

A method for stiffening lateral buckling of a floor slab structure according to the present invention comprises a girder having girders studs at its upper ends, a prestressed concrete composite floor having openings near its ends, and a brace at one end. A procedure of placing the end of the prestressed concrete composite floor on the upper end of the girders using a longitudinal brace member provided with studs, and placing the first end, which is one end of the brace member, on the prestressed concrete composite floor It is attached to the opening from the lower surface side, the bracket stud is passed through the opening and exposed to the upper surface of the prestressed concrete composite floor, and the second end, which is the other end of the bracket member, is attached to the girders and placing concrete on the upper surface of the prestressed concrete composite floor and the upper ends of the girders to integrate the girders and the prestressed concrete composite floor with the girders studs and stilt studs. there is Therefore, the present invention can suppress lateral buckling without requiring small beams between large beams.

FIG. 1 is a cross-sectional first explanatory view for explaining the floor slab structure according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view along II-II in FIG. 1, which is a cross-sectional second explanatory view for describing the floor slab structure according to the first embodiment of the present invention. FIG. 3 is a cross section along III-III in FIG. 1, which is a cross-sectional third explanatory view for explaining the floor slab structure according to the first embodiment of the present invention. FIG. 4 is a cross section taken along line IV-IV in FIG. 5, and is a cross-sectional first explanatory view for explaining the prestressed concrete composite floor of the floor slab structure according to the first embodiment of the present invention. FIG. 5 is a cross section taken along line VV in FIG. 4, which is a second explanatory cross-sectional view for explaining the prestressed concrete composite floor of the floor slab structure according to the first embodiment of the present invention. FIG. 6 is an explanatory plan view for explaining the brace member of the floor slab structure according to the first embodiment of the present invention. FIG. 7 is an explanatory front view for explaining the brace member of the floor slab structure according to the first embodiment of the present invention. FIG. 8 is a VIII-VIII cross section of FIG. 10, showing the first cross-sectional reinforcement arrangement for explaining the reinforcement arrangement of the floor slab structure and the lateral buckling stiffening method of the floor slab structure according to the first embodiment of the present invention. It is an explanatory diagram. FIG. 9 is a sectional view taken along line IX-IX of FIG. 10, showing a second cross-sectional reinforcement arrangement for explaining the reinforcement arrangement of the floor slab structure and the lateral buckling stiffening method of the floor slab structure according to the first embodiment of the present invention. It is an explanatory diagram. FIG. 10 is an XX cross section of FIG. 9, showing a third cross-sectional reinforcement arrangement for explaining the floor slab structure reinforcement arrangement and the floor slab structure lateral buckling stiffening method according to the first embodiment of the present invention. It is an explanatory diagram. FIG. 11 is an enlarged explanatory view of a main part for explaining the floor slab structure according to the second embodiment of the present invention.

A floor slab structure and a lateral buckling stiffening method for the floor slab structure according to the first embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show a floor slab structure 1 according to a first embodiment.

The floor slab structure 1 is realized, for example, in a steel-frame construction, and as shown in FIG. Only one girder 2 of the pair is shown, and the other girder 2 is omitted.), and the prestressed concrete composite floor 6 and the girder 2 are connected. and cast-in-place concrete 19 placed on the upper surface of the prestressed concrete composite floor 6 and the upper ends 3 of the girders 2. In this floor slab structure 1, no small girders are spanned between the large girders 2.例文帳に追加That is, the floor slab structure 1 does not have small beams, and the large beams 2 and the prestressed concrete composite floor 6 are joined by the square members 13. In this state, the large beams 2, the prestressed concrete composite floor 6, and the square members 13 are joined. are integrated by the cast-in-place concrete 19.

The girders 2 are appropriately provided with rib plates 4 and gusset plates 5 . The upper end portion 3 of the girders 2 is provided with girders studs 23 as a plurality of joining members. The brace member 13 has a first end 14 which is one end joined to the prestressed concrete composite floor 6, a second end 15 which is the other end joined to the gusset plate 5, and a first It has a brace body 16 connecting the end 14 and the second end 15 . The upper surface of the first end portion 14 is provided with bracket studs 24 as a plurality of joining members. The bracket studs 24 pass through openings 11 formed in the prestressed concrete composite floor 6 .

The prestressed concrete composite floor 6 and the brace members 13 will be further described below with reference to the drawings. In figures 4 and 5 a prestressed concrete composite floor 6 is shown and in figures 6 and 7 a brace member 13 is shown.

The prestressed concrete composite floor 6 is, for example, a precast floor slab manufactured in advance at a factory or the like, and is a slab of prestressed concrete structure. The introduction of prestress is a pretension method. As shown in FIGS. 4 and 5, the prestressed concrete composite floor 6 is formed in a plate shape and has a concrete layer 7 and a heat insulating layer 8 preliminarily formed on the lower surface of the concrete layer 7 . An upper rib portion 9 projecting upward is formed on the placing surface, which is the upper surface of the concrete layer 7, and a lower rib portion 25 projecting downward is formed on the lower surface. Between the upper rib portion 9 and the lower rib portion 25 and inside the concrete layer 7, a PC steel wire 10 is embedded in advance and prestressed. The heat insulating layer 8 is made of, for example, polystyrene foam, urethane foam, phenol foam, cellulose fiber, carbonized cork, glass wool, rock wool, etc., and is formed in advance into a plate shape and arranged between the lower rib portions 25 .

As shown in FIG. 5, the prestressed concrete composite floor 6 is formed with openings 11 penetrating in the plate thickness direction. The opening 11 is rectangular and is formed in the prestressed concrete composite floor 6 in the vicinity of the floor slab end 12 which is the end in the longitudinal direction.

The shape and type of the prestressed concrete composite floor 6 are arbitrary. Therefore, the prestressed concrete composite floor 6 may have a shape that does not have the upper rib portion 9 and the lower rib portion 25, a shape that does not have the upper rib portion 9 or the lower rib portion 25, or a heat insulating layer. It does not have to have 8. The prestressed concrete composite floor 6 may have, for example, a shape having a flat bottom surface and an upper rib portion 9 on the top surface (a so-called inverted T shape), or a shape having a so-called C-channel cross section. . Introduction of prestress may be a post-tension method.

As shown in FIGS. 6 and 7, the first end 14, which is the upper end of the brace member 13, includes a square plate-like member 17 and a support member 18 connected to the lower surface of the plate-like member 17. have. A plurality of bracket studs 24 are provided on the upper surface of the plate-like member 17 . The plate member 17 is attached to the opening 11 from the lower surface side of the prestressed concrete composite floor 6 , and the bracket stud 24 is exposed to the upper surface of the prestressed concrete composite floor 6 through the opening 11 .

Next, the pouring of the cast-in-place concrete 19 in the floor slab structure 1 will be described together with the lateral buckling stiffening method of the floor slab structure with reference to the drawings. FIGS. 8 to 10 show the state of bonding and reinforcement arrangement of each member.

The slab end 12 of the prestressed concrete composite floor 6 rests on the upper end 3 of the girders 2 as shown in FIG. The second end 15 of the brace member 13 is joined to the gusset plate 5 of the girders 2 and the first end 14 is attached to the opening 11 of the prestressed concrete composite floor 6 . In this state, as shown in FIGS. 8 to 10, top main reinforcements 20, bottom main reinforcements 21, top distributing reinforcements 22, etc. are appropriately arranged on the upper surface of the prestressed concrete composite floor 6. FIG. In this state, the cast-in-place concrete 19 is cast on the upper surface of the prestressed concrete composite floor 6 and the upper end portion 3 of the girders 2, thereby forming the girders 2 and the prestressed concrete composite floor 6 together with the girders studs 23 and the bracket studs 24. to form a composite structure. In addition, in this embodiment, the procedure of connecting a small beam between the large beams 2 is not performed.

Although not shown, in the first embodiment, floor slab end portions 12 of a plurality of prestressed concrete composite floors 6 are placed facing each other at the upper end portion 3 of the girders 2 with a space therebetween, and cast-in-place concrete is placed. It also includes embodiments integrated by 19.

Next, effects of the first embodiment will be described.

As described above, in the first embodiment, the prestressed concrete composite floor 6 and the girders 2 are integrated together with the girders studs 23 by the cast-in-place concrete 19 to form a composite structure. Therefore, the floor slab structure 1 can suppress lateral buckling without requiring a small beam that spans between the large girders 2 . In addition, since no small beams are required, labor can be saved, the construction period can be shortened, and the impact on the interior can be suppressed. The prestressed concrete composite floor 6 has high rigidity because the PC steel wires 10 are embedded to introduce prestress and the ribs 9 and 25 are formed on the upper and lower sides. Therefore, even if the distance between the girders 2 is relatively long, the prestressed concrete composite floor 6 can be laid between the girders 2 without using small girders.

In particular, the brace member 13 is joined to the prestressed concrete composite floor 6 with cast-in-place concrete 19 with the first end 14 attached to the opening 11 of the prestressed concrete composite floor 6 and having the brace stud 24 passed therethrough. Integral, the second end 15 is joined to the gusset plate 5 of the girder 2 . Therefore, the brace member 13 complements the rigidity against the horizontal force applied to the girders 2 and suppresses lateral buckling. Moreover, compared with the case where a small beam is provided between the large beams 2, labor can be saved, the construction period can be shortened, and the influence on the interior can be suppressed.

Next, the floor slab structure according to the second embodiment will be described based on the drawings. FIG. 11 shows a floor slab structure 101 according to the second embodiment. In addition, the structure same as the floor slab structure 1 which concerns on 1st embodiment is illustrated with the code|symbol same as the floor slab structure 1. As shown in FIG.

As shown in FIG. 11, in the floor slab structure 101, the floor slab ends 112 of the prestressed concrete composite floor 106 abut each other with a gap on the upper end 3 of the girder 2. A portion 112 is placed on the upper end portion 3, and a PC steel wire 110 projecting from the floor slab end portion 112 is connected by a coupler 125 as a connecting member. The connection of the PC steel wires 110 by the coupler 125 increases rigidity and improves resistance to lateral buckling. Other configurations such as the brace member 13 are the same as those of the floor slab structure 1 according to the first embodiment.

Although not shown, in the floor slab structure according to the third embodiment, PC steel wires are connected by couplers as in the second embodiment, but unlike the first embodiment, there is no brace member. Even with this configuration, the PC steel wires are connected by the coupler, so that the rigidity is increased and the resistance to lateral buckling is improved.

Although not shown, the floor slab structure according to the fourth embodiment does not have the brace members of the first embodiment and the couplers of the second embodiment. That is, the floor slab structure according to the fourth embodiment has girders, a prestressed concrete composite floor spanned between the facing girders, and cast-in-place concrete placed on the upper surface of the prestressed concrete composite floor. is doing. Even with this configuration, the prestressed concrete composite floor and the girders are integrated together with the joining members by concrete to form a composite structure, so that lateral buckling can be suppressed.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. Various design changes can be made to the present invention without departing from the scope of the claims.

Reference Signs List 1, 101 Floor slab structure 2 Large beam 3 Upper end 4 Rib plate 5 Gusset plate 6, 106 Prestressed concrete composite floor 7 Concrete layer 8 Thermal insulation layer 9 Upper rib 10, 110 PC steel wire 11 Opening 12, 112 Floor slab edge 13 Bracket member 14 First end 15 Second end 16 Bracket main body 17 Plate-like member 18 Support member 19 Cast-in-place concrete (concrete)
20 upper end main reinforcement 21 lower end main reinforcement 22 upper end connecting reinforcement 23 girder stud (joint member)
24 cane stud 25 lower rib portion 125 coupler (connecting member)

Claims (5)

A girder with a joint member provided at the upper end;
a precast prestressed concrete composite floor spanned between the facing girders and having openings near the ends thereof;
a brace member having a first end attached to the opening and a second end attached to the girders;
Concrete that is cast on the upper surface of the precast prestressed concrete composite floor and integrates the girders and the precast prestressed concrete composite floor together with the joining member and the first end ,
having no girders between said girders,
A floor slab structure characterized by: The precast prestressed concrete composite floor is
Having a rib portion in which a PC steel wire is embedded and a non-rib portion in which the PC steel wire is not embedded,
wherein the opening is formed in the non-rib portion ;
The floor slab structure according to claim 1, characterized by: The PC steel wire protrudes from the end,
The PC steel wires of each of the plurality of precast prestressed concrete composite floors placed with the ends facing each other with a gap at the upper end of the girders are connected by a connecting member ,
The floor slab structure according to claim 2 , characterized in that: A stud is provided on the upper surface of the first end,
said second end attached to a gusset plate on said girders;
the stud passes through the opening and is integral with the concrete;
The floor slab structure according to any one of claims 1 to 3, characterized in that: girders with girders studs at the top,
a precast prestressed concrete composite floor with openings near the edges;
A lateral buckling stiffening method for a floor slab structure using a longitudinal brace member provided with a brace stud at one end thereof,
a step of spanning the end of the precast prestressed concrete composite floor over the upper end of the girders;
A first end, which is one end of the brace member, is attached to the opening from the lower surface side of the precast prestressed concrete composite floor, and the brace stud is passed through the opening to pass the precast prestressed concrete composite floor. and attaching the second end, which is the other end of the brace member, to a gusset plate provided on the girders;
placing concrete on the upper surface of the precast prestressed concrete composite floor and the upper end of the girders, and integrating the girders and the precast prestressed concrete composite floor together with the girders studs and the square studs. ,
A lateral buckling stiffening method for a floor slab structure, characterized by:

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