JP2001081724A - Joint structure of composite floor slab - Google Patents

Abstract

(57) [Problem] To provide a joint structure which improves the strength of a joint portion of a composite floor slab and can withstand even a relatively large bending force, shear force or the like acting thereon. SOLUTION: In a composite slab in which a steel bottom plate, a shaped steel disposed on the steel bottom plate, and a reinforcing bar are integrated with concrete, a joint for connecting adjacent steel bottom plates. And the adjacent steel slabs 12
The distance between the joints of the H-section steel 20 of the
a is smaller than the interval of a.
For example, by arranging the loop-shaped portion 25 of FIG. 4 and providing concrete stiffening means along the longitudinal direction of the joint H-beam 20 and casting concrete 19, a direction perpendicular to the longitudinal direction of the joint H-beam is provided. And the joints of adjacent steel bottom plates are continuously integrated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a steel-concrete composite slab applied to a bridge.

[0002]

2. Description of the Related Art Various prior arts of a joint structure between panels of a steel-concrete composite slab have been proposed. One example is a joint section of a composite slab disclosed in JP-A-9-242237 and a method of constructing the joint. There is.

The technique disclosed in Japanese Patent Application Laid-Open No. 9-242237 discloses a composite floor slab 1 in which a concrete slab 2 is filled with concrete 3 as shown in FIGS. From the ends of the floor slabs 1, 1 to the joint bottom plates 2a, 2a
And the stoppers 4, 4 protruding from the joint bottom plates 2a, 2a are surrounded by a reinforcing bar 5, so that the joints 4 are buried between the two joint sections 6, 6 facing each other. Partial concrete 7 is cast, and the upper steel plates 8 are joined to each other via welding of the connection steel plates 9, and the connection steel plates 9 cover the upper part of the joint concrete 7. Reference numeral 10 denotes a butt portion.

[0004] In Japanese Patent Application Laid-Open No. 9-242237, it is assumed that the upper side of the floor slab is covered with a steel plate.
The burden on the lower part of the joint is reduced. Therefore, this structure is effective when the effect borne by the joint is not so large, but when a relatively large force acts on the joint, the joint structure of the composite floor slab is not effective.

[0005]

In the conventional joint structure of a composite floor slab, when a relatively large force such as a bending force, a shearing force or a torsion force acts on the joint, the force at which these joints are destroyed. The structure was not able to withstand enough.

An object of the present invention is to provide a joint structure of a composite floor slab which solves the above problems.

[0007]

In order to achieve the above object, the joint structure of the composite floor slab according to the present invention is constituted as follows. According to a first aspect of the present invention, in a composite slab in which a steel bottom plate, and a shaped steel and a reinforcing bar provided on the steel bottom plate are integrated with concrete, the adjacent steel bottom plates are joined to each other. The joint section steel of each of the adjacent steel floor slabs is provided with rigidity strengthening means along the longitudinal direction, so that the action in the direction perpendicular to the longitudinal direction of the joint section steel is provided. It is characterized by reducing the force and continuously integrating the joints of the adjacent steel bottom plates. According to a second aspect of the present invention, as a means for enhancing rigidity in the longitudinal direction of the section steel at the joint section, the interval between the section steel sections located adjacent to the joint section is provided at a smaller interval than the section steel section at the other section. It is characterized by the following. According to a third aspect of the present invention, as the means for reinforcing rigidity in the longitudinal direction of the section steel at the joint portion, the steel bottom plates adjacent to each other are simply joined to each other by a joint fitting to such an extent that leakage at the time of filling concrete is prevented. In the joint space between each joint section steel located adjacent to the section, a reinforcing bar that extends in the direction perpendicular to the longitudinal direction of the joint section steel and has a loop-shaped portion at the end is disposed, and It is characterized by being provided with a plurality at predetermined intervals along the longitudinal direction and filled with concrete. According to a fourth aspect of the present invention, as the means for reinforcing rigidity in the longitudinal direction of the section steel at the joint section, the joint section section steel located adjacent to the joint section is constituted by a channel steel provided in an arrangement in which webs are back to back. A connecting jig and a bar-shaped steel material are installed on the web of the channel steel so as to penetrate each web, and a reinforcing bar is arranged above the channel steel in a direction perpendicular to the longitudinal direction of the channel steel. It is characterized by a structure filled with concrete. According to a fifth aspect of the present invention, as the means for strengthening the rigidity in the longitudinal direction of the section steel at the joint section, each of the adjacent section steel sections is made of a joint section steel material such as a channel section steel, an H section steel or an I section steel. Then, a joint reinforcing steel made of a shaped steel pipe or a square steel pipe is installed in a joint closed space formed by the adjacent joint steel, and both joints are bolted through the joint steel and the joint reinforcing steel. Join steel,
On the upper side of the joint steel material, a reinforcing bar is arranged in a direction perpendicular to the longitudinal direction thereof, and then concrete is filled. According to a sixth aspect of the present invention, as a means for enhancing rigidity in the longitudinal direction of the section steel at the joint portion, a stopper is welded to the upper surfaces of the end portions of both adjacent steel bottom plates, and an opening is formed so as to penetrate the stopper. Install the provided steel plate, or
An overhanging steel plate is joined to the upper surface of the end of one adjacent steel bottom plate by bolting or welding, and a stopper is welded to the upper surface of the end of the other steel bottom plate. It is characterized in that the stopper is pierced, a reinforcing bar is arranged in a direction perpendicular to the longitudinal direction of the section steel, and concrete is filled.

[0008]

According to the present invention, in the steel-concrete composite slab, the joint portion of the steel bottom plate adjacent to the steel-concrete composite slab is provided with a joint portion rigidity strengthening means made of a reinforcing steel material or the like arranged densely in the joint portion or in the joint space. The joint section rigidity strengthening means is arranged along the longitudinal direction of the joint section steel, so that most of the bending moment acting on the joint section is reduced by the joint section rigidity along the longitudinal direction of the joint section steel. The point is that the load is borne by the reinforcing means, the load of the bending moment is reduced in the direction perpendicular to the longitudinal direction of the section steel, and only the shear force is transmitted. Thereby, it also effectively functions as a joint part of a composite floor slab on which a relatively large force acts. In addition, the upper part of the floor slab is not covered with the upper steel plate as in the past, and it is open, so it is possible to build joints only by working from the top before placing concrete, which has the advantage of excellent workability. is there.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a first embodiment, which is an embodiment corresponding to claims 2 and 3. In the first embodiment, the opposing ends 13 of the adjacent steel bottom plates 12 and 12 in the composite floor slab 11 are disposed close to each other with a slight gap 14 therebetween, and the opposing ends 13 of the respective steel bottom plates 12 and 12 are arranged. A connecting steel plate 15 is disposed so as to straddle and close the gap 14, and the two members are connected via bolts and nuts. That is, the connecting steel plate 15 and the opposing end 13
In the illustrated example, threaded stud pins 16 are erected on the upper surfaces of the end portions of the steel bottom plates 12, 12, and the stud pins 16 are connected to both sides of the connection steel plate 15. By fitting a pin hole 17 opened in the portion and screwing a nut 18 into a thread portion of the stud pin 16, each steel bottom plate 12 and the connection steel plate 15 are connected, and the gap 14 is closed.

Before the connection, the steel bottom plates 12 and 12 are separated from each other and form one unit of steel panel before being connected. Concrete 19 is placed on the upper side of each steel bottom plate 12. The continuous composite floor slab 11 is constructed by providing.

The upper surface of each steel bottom plate 12, which is the main element of each unit of steel panel, is spaced from the H-shaped steel, I by a predetermined distance.
A plurality of section steels (indicated as H-section steels) 20, 20a, such as section steels, are arranged in parallel, and the lower flange 21 is attached to the steel bottom plate 12.
And is fixed to the steel bottom plate 12 by connecting fillet welding or intermittent fillet welding 9 on both side edges of the flange. Hereinafter, the H-shaped steel provided at the opposite end 13 of the steel bottom plate 12 is referred to as a joint H-shaped steel 20.

Openings 23 are opened at predetermined intervals in the web 22 of each joint H-section steel 20 as shown in the figure. Reinforcing bars 24 are disposed on the upper portions of the steel bottom plates 12, 12, respectively, in a direction perpendicular to the longitudinal direction of the steel bottom plates 12, and loop-shaped portions 25 are provided at the ends of the reinforcing bars 24.
The loop-shaped portion 25 is formed by the adjacent steel bottom plates 12 and 1.
2, a joint H-section steel 20 located at the opposite end 13;
After being located in the joint space 26, which is the interval of 20,
A tip-end folded reinforcing bar 27 extending from the loop-shaped portion 25,
The joint H is inserted into an opening 23 formed in a web 22 of the H-section steel 20.

In the joint space 26, the right and left reinforcing bars 24 extending above the adjacent left and right steel bottom plates 12 are provided.
The loop-shaped portions 25a and 25b of the joints a and 24b are alternately arranged in the longitudinal direction of the joint H-beam 20 alternately. When the reinforcing bar 14 is viewed with the loop-shaped portion 25 as a reference, every other one of the loop-shaped portions 25a and 25b arranged at a predetermined interval in the longitudinal direction of the joint H-beam 20 is on the right side. Then, it extends along the upper part of each steel bottom plate 12 on the left side. In the illustrated example, the loop-shaped portion 2
The ends 25c and 25d of the other reinforcing bar 24 extending from the side where the 5a and 25b are not provided are cut in a straight state.

The distance L1 between adjacent joint H-beams 20, 20 is different from that of H-beams 20a, 2 at other portions.
0a is provided smaller than the interval L. That is, the arrangement of the H-shaped steel 20 in the joint portion is changed to the H-shaped steel 20 in another portion.
This is provided more densely than the interval a, thereby improving the longitudinal rigidity of the joint H-beams 20, 20 in the joint space 26.

As described above, the H-beam 2
0a, a joint H-section steel 20 is welded to the steel bottom plate 12 to constitute a steel floor panel alone, which is transported to the site, and the steel floor plate 12 in the steel floor panel alone is conveyed.
Is constructed on site and connected by a simple connecting device via the connecting steel plate 15. Further, a reinforcing bar 24 with a loop-shaped portion 25 is arranged on the upper part of each joint H-beam 20, and the loop-shaped portion 25 is arranged in a joint space 26. Further, the joint H
The steel-concrete composite floor slab 11 is constructed by casting concrete 19 with a predetermined thickness on the upper surface of the steel bottom plate 12 so that the section steel 20 and the reinforcing bar 24 with a loop portion are buried.

In the steel-concrete composite slab 11 according to the first embodiment, as described above, in the joint space 26 between the adjacent steel bottom plates 12, 12, the adjacent joint H-section steel 20, The spacing L1 of 20 is provided smaller than the spacing L of the H-beams 20a, 20a at other portions, thereby reducing the longitudinal rigidity of the joint H-beams 20, 20 in the joint space 26. Has improved.

Further, a loop-shaped portion 25 integral with the reinforcing bar 24 is provided.
Are present at predetermined intervals along the longitudinal direction of the joint H-beam 20, and the presence of the loop 25 increases the rigidity of the joint in the longitudinal direction.
Can be reduced in the direction perpendicular to the longitudinal direction.

That is, in the first embodiment, in the joint between the adjacent steel bottom plates 12, 12, most of the bending moment applied to the joint H-shaped steel 20 in the longitudinal direction is substantially equal to the joint H-shaped steel 20. The joint steel plate 15, which also serves as a cover plate, resists a small bending moment in the direction perpendicular to the longitudinal direction of the joint H-section steel 20. Also, for the shear force acting on the joint,
The resistance is obtained by integrating the loop-shaped portion 25 formed in the joint space 26 between the joint H-shaped steel members 20 and the concrete.

FIGS. 4 and 5 show a second embodiment, which is an embodiment corresponding to claim 4. In the second embodiment, the opposed end portions 13 of the steel bottom plates 12 and 12 are butted against each other without any gap, and both the steel bottom plates 12 and 12 are opposed to each other.
That the section steel provided at the opposite end portion 13 of the channel section is the channel section 29, and that the connecting means between the channel sections 29 is different,
The second embodiment differs from the first embodiment in that the ends of the reinforcing bars 24 are straight, and the other configurations are the same as those in the first embodiment.

The second embodiment will be described mainly with respect to differences from the first embodiment. The two channel steels 29, 29 are disposed so that the back sides of the webs 30 face each other, and the respective lower flanges 21 are provided. Are fixed to the upper surface of the steel bottom plate 12 by continuous fillet welding or intermittent fillet welding 9.

As shown in FIGS. 4 and 5, both channel steels 29,
29, when the opposing end portions 13 of both steel bottom plates 12 abut against each other, a slight gap is formed between the two webs 30, and through the gaps, both the webs 30 are penetrated and a coupling jig 32 such as a bolt is formed. And a nut is screwed into the screw portion of the connecting jig 32 to prevent the two webs 30 from separating from each other, and then the concrete 19 is cast.

Further, the web 30 of the channel steel 29 at both joints is used.
Has a plurality of openings 33 at predetermined intervals in the longitudinal direction thereof, and each opening 33 of both webs 30 is provided in conformity with each other. A rod-shaped steel material 34 having an outer diameter and a predetermined length is inserted.

In Embodiment 2, in a factory,
An H-shaped steel 20a and a joint channel steel 29 are welded to the steel bottom plate 12 to produce a steel panel alone, and this steel panel alone is transported to the site, and is joined by a connecting jig 32 at the site construction. By joining the joint channel steel 29, the bottom plate 12
To join. Next, the web 3 of the joint channel steel 29 will be described.
After inserting and holding the bar-shaped steel material 34 in the opening 33 of the
By casting concrete 28 with a predetermined thickness on the steel bottom plate 12 such that each joint channel steel 29, reinforcing steel 24, and bar-shaped steel material 34 are buried, the steel-concrete composite (composite) floor slab 11 is formed. Be built.

In the steel-concrete composite slab 11 according to the second embodiment, at the joint between the adjacent steel bottom plates 12, 12, the openings 33 of the two webs 30 of the two channel steels 29 are formed. Concrete 19 is also filled in the inserted bar-shaped steel material 34, and a plurality of the bar-shaped steel materials 34 are present at a predetermined interval in the longitudinal direction of both joint portion channel steels 29,
The joint portion is reinforced by the bar-shaped steel material 34 and the connecting jig 32.

That is, most of the bending moment acting on the joint portion is borne by the joint portion channel steels 29 arranged so that the webs 30 overlap (that is, more densely than the other H-section steels 20a). Then, a small bending moment in the direction perpendicular to the longitudinal direction of the joint channel steel 29 is resisted by the coupling jig 32 penetrating the lower part of the web 30. Further, the bar-shaped steel material 34 penetrating the two webs 30 of both the joint channel steels 29 resists the shearing force acting on the joint.

FIGS. 6 and 7 show a third embodiment, which is an embodiment corresponding to claim 5. In the third embodiment, an H-section steel 20a and a joint H-section steel 20 are disposed in parallel on a top surface of a steel bottom plate 12 at a predetermined interval, and a lower flange 21 is fixed by continuous fillet welding or intermittent fillet welding 9. Have been. These configurations are the same as in the first embodiment.

In the third embodiment, in addition to the above-described structure, the joint closed space 26a formed between the joints H-shaped steel 20 at the joint is provided along the longitudinal direction of the joints H-shaped steel 20. In addition, a reinforcing joint steel member made of a shaped steel such as an H-shaped steel, an I-shaped steel, a channel steel, or a square steel pipe is provided. Is shown in the example. The joint-section reinforcing H-shaped steel 36 is provided with dimensions such that both the width and the height can be accommodated in the joint closed space 26a. In the web 37 of the H-shaped steel 36 for reinforcing the joint portion, an insertion hole 38 for the coupling jig 32 such as a bolt is formed.

Then, a connecting jig 32 such as a bolt is provided so as to penetrate a lower portion of the web 22 of the H-shaped steel 20 at both joint portions of each steel bottom plate 12 and the web 37 of the H-shaped steel 36 for reinforcing the joint portion.
A nut 35 is screwed into the screw portion of the jig 32 to form a joint H
The joint between the steel bottom plates 12 is formed by preventing the separation of the webs 22 of the section steel 20 and casting the concrete 19.

In Embodiment 3, in a factory in advance,
A steel floor panel alone is manufactured by welding the H-section steel 20a and the joint H-section steel 20 to the steel bottom plate 12, and the steel floor panel alone is transported to the site, and the connection jig 32 is constructed at the site.
By connecting both joint H-section steels 20, both steel bottom plates 12 are connected. Further, an H-section steel 36 for reinforcing the joint section is provided in the joint section closed space 26a,
0, a concrete 19 is cast on the upper surface of the steel bottom plate 12 with a predetermined thickness such that the H-shaped steel 36 for reinforcing the joint portion and the reinforcing bar 24 are buried.
1 is built.

In the steel-concrete composite slab 11 according to the third embodiment, in the joint portion of the adjacent steel bottom plate 12, both joint portions H-section steel 20 are connected by a connecting jig 32, and H-section steel 3 for reinforcing the joint in the joint closed space 26a
6 and the concrete 19 is filled, so that the joint part is formed by the joint jig 32 and the joint part reinforcing H-shaped steel 36.
Reinforced with.

That is, most of the bending moment acting on the joint portion is borne by the joint H-beams 20, and a small bending moment in the perpendicular direction passes through the lower portion of the web 22 of each joint H-beam 20. It is resisted by a connecting jig 32 such as a bolt. Further, the H-shaped steel 36 for reinforcing the joint in the joint closed space 26a resists the shearing force acting on the joint.

FIGS. 8 and 9 show embodiments 4 and 5, which are embodiments corresponding to claim 6. FIG. Each embodiment 4,
5, the opposite end 13 of the steel bottom plate 12 is disposed with a slight gap 14, and the joint H-shaped steel 20 is disposed on the upper surface of the steel bottom plate 12 in parallel at a predetermined interval. The lower flange 21 is fixed by continuous fillet welding or intermittent fillet welding 9. These configurations are substantially the same as those of the first and third embodiments. However, in the fourth and fifth embodiments, the disposition position of the joint H-shaped steel 20 is different from that of the first and third embodiments in that the opposite end of the steel bottom plate 12 is provided. It is provided slightly away from the part 13.

In the joint portion of the fourth embodiment shown in FIG. 8, the joint portions H of the joint portions H of the steel bottom plates 12 and the upper surface of the steel bottom plate 12 between the opposed end portions 13 are respectively provided. At predetermined intervals along the longitudinal direction of the section steel 20, slip stoppers 39 such as studs are welded at a factory.

In the joint shown in FIG. 8, a connecting steel plate 40 is disposed over both steel bottom plates 12, and the slip stopper 39 is provided in an opening 44 formed on both sides of the connecting steel plate 40.
To the insertion position.

Further, in the joint portion of the fifth embodiment shown in FIG. 9, a joint portion H is formed on the upper surface of the steel bottom plate 12 between the joint portion H-section steel 20 of one steel bottom plate 12 and the opposite end portion 13.
At a predetermined interval along the longitudinal direction of the section steel 20, slip stoppers 39 such as studs are welded at a factory, and the joint H-section steel 20 of the other steel bottom plate 12 and the opposite end 13
Between the joint H-shaped steel 2
The bolts 42 are welded at predetermined intervals along the longitudinal direction of the zero.

In the joint portion shown in FIG. 9, a connecting steel plate 40 is provided so as to straddle both steel bottom plates 12, and a bolt 42 is fitted into an opening 41 formed on one side of the connecting steel plate 40.
By fastening the nut 43 from the upper side, the connecting steel plate 40 is fixed to the steel bottom plate 12 on one side (right side in the figure). At this time, the stopper 39 is inserted into the opening 44 provided on the other side of the connecting steel plate 40.

In each of the fourth and fifth embodiments, the joint H-shaped steel 20 and the stopper 39 are attached to the steel bottom plate 12 in advance in the factory.
And a bolt 42 are welded to produce a steel floor panel alone. Then, the steel floor panel alone is transported to a plurality of sites, a connecting steel plate 40 is arranged at the joint portion by site construction, and in the example of FIG. 8, the slip stoppers 39 on both sides are positioned in the openings 44 on both sides. In the example of FIG. 9, a nut 43 is screwed onto a bolt 42 to fix the connecting steel plate 40 to one steel bottom plate 12, and the stopper 39 is positioned in the opening 44, and H-section steel 20 and slip prevention 3
The concrete 19 and the reinforcing bar 24 are buried.
Is cast on a steel bottom plate 12 with a predetermined thickness, whereby the steel-concrete composite floor slab 11 is constructed.

In the steel-concrete plywood floor slabs 11 according to the fourth and fifth embodiments, at the joint portion of the adjacent steel bottom plates 12, the two steel bottom plates 12 are connected via the connection steel plate 40, In addition, the joint space 26 is filled with the concrete 19 via the slip stopper 39 to reinforce the joint portion.

That is, most of the bending moment acting on the joint portion is borne by the joint portion H-shaped steel 20, and the joint portion is not connected to the joint portion H-shaped steel 20 for a small bending moment perpendicular to the longitudinal direction. The steel plate 40 resists. In addition, the shear force acting on the joint portion is reduced by the joint portion connecting steel plate 40.
And the integrated structure of the concrete 19 and the slip stopper 39 penetrating therethrough.

[0040]

According to the present invention, in the joint portion of the adjacent steel bottom plate in the steel-concrete composite slab, the joint portion made of a reinforcing steel material or the like arranged densely in the joint section steel or in the joint space. Since the rigidity enhancing means is provided along the longitudinal direction of the joint section steel, most of the bending moment acting on the joint section is borne by the joint section steel with improved rigidity, Since the load of the bending moment can be reduced in the direction perpendicular to the longitudinal direction and only the shearing force can be transmitted, it can effectively function as a joint part of a composite slab on which a relatively large force acts. In addition, the upper part of the floor slab is not covered with the upper steel plate as in the past, and it is open, so it is possible to construct the joint part only by working from the top before casting concrete, so it is excellent in workability. effective.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a joint section of a composite floor slab according to a first embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view of FIG. 1;

FIG. 4 is a cross-sectional view of a joint portion of a composite floor slab according to a second embodiment.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a cross-sectional view of a joint section of a composite floor slab according to a third embodiment.

FIG. 7 is a sectional view taken along line CC of FIG. 6;

FIG. 8 is a perspective view of a joint section of a composite floor slab according to a fourth embodiment before concrete is cast.

FIG. 9 is a perspective view of a joint portion of a composite floor slab according to a fifth embodiment before concrete is cast.

FIG. 10 is a sectional view of a joint section of a composite floor slab according to a conventional example.

FIG. 11 is a sectional view taken along the line DD in FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Synthetic floor slab 2 Steel bottom plate 3 Concrete 4 Non-slip 5 Steel bar 6 Joint section steel 7 Joint concrete 8 Upper steel plate 9 Fillet weld 10 Butt joint 11 Synthetic slab 12 Steel bottom plate 13 Opposite end 14 Gap 15 Connection Steel plate 16 Stud pin 17 Pin hole 18 Nut 19 Concrete 20 Joint H-shaped steel 20a H-shaped steel 21 Lower flange 22 Web 23 Opening 24 Reinforcing bar 25 Loop-shaped portion 26 Joint space 27 Folded rebar 29 Joint groove steel REFERENCE SIGNS LIST 30 web 32 joining jig 33 opening 34 rod-shaped steel material 35 nut 36 H-shaped steel for reinforcing joint 37 web 38 insertion hole 39 stopper 40 connecting steel plate 41 opening 42 bolt 43 nut 44 opening

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[Procedure amendment]

[Submission date] September 24, 1999 (1999.9.2)
4)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

In the joint space 26, the right and left reinforcing bars 24 extending above the adjacent left and right steel bottom plates 12 are provided.
The loop-shaped portions 25a and 25b of the joints a and 24b are alternately arranged in the longitudinal direction of the joint H-beam 20 alternately. When the reinforcing bar 24 is viewed with the loop portion 25 as a reference, every other one of the loop portions 25a and 25b arranged at a predetermined interval in the longitudinal direction of the joint H-section steel 20 is on the right side. Then, it extends along the upper part of each steel bottom plate 12 on the left side. In the illustrated example, the loop-shaped portion 2
The ends 25c and 25d of the other reinforcing bar 24 extending from the side where the 5a and 25b are not provided are cut in a straight state.

Continued on the front page (72) Inventor Yasumori Fujii 2-6-3 Otemachi, Chiyoda-ku, Tokyo Inside Nippon Steel Corporation (72) Inventor Yutaka Sakata 2-6-3, Otemachi, Chiyoda-ku, Tokyo New Japan F-term (reference) in Steel Corporation 2D059 AA17 CC04 GG55

Claims (6)

[Claims] 1. A composite floor slab in which a steel bottom plate and a shaped steel and a reinforcing bar provided on the steel bottom plate are integrated with concrete to connect adjacent steel bottom plates. The joint section structure of each of the adjacent steel floor slabs is provided with rigidity strengthening means along the longitudinal direction, so that the acting force in the direction perpendicular to the longitudinal direction of the joint section steel section. The joint structure of a composite floor slab is characterized in that joints of adjacent steel bottom plates are continuously integrated. 2. As means for strengthening the rigidity in the longitudinal direction of the section steel at the joint section, the intervals between the joint section sections adjacent to the joint section are provided at smaller intervals than the section steel sections at the other sections. The joint structure of a composite floor slab according to claim 1, wherein: 3. As means for strengthening rigidity in the longitudinal direction of the section steel at the joint portion, the steel bottom plates adjacent to each other are simply joined together by a joint fitting to such an extent that leakage at the time of filling concrete is prevented. In the joint space between the joint sections that are positioned adjacent to each other, a reinforcing bar that extends in a direction perpendicular to the longitudinal direction of the joint section and that has a loop portion at the end is disposed, and the longitudinal section of the joint section The joint structure according to claim 1, wherein a plurality of joints are provided at predetermined intervals along the direction and are filled with concrete. 4. As a means for enhancing the rigidity of the joint section in the longitudinal direction of the section steel, the joint section section steel located adjacent to the joint section is constituted by a channel section steel provided in an arrangement in which webs are back to back, A connecting jig and a bar-shaped steel material are installed on the web of the channel steel so as to penetrate each web, and a reinforcing bar is arranged on the upper side of the channel steel in a direction perpendicular to the longitudinal direction of the channel steel, and then the concrete. The joint structure of a synthetic floor slab according to claim 1, characterized in that: 5. As the means for enhancing the rigidity in the longitudinal direction of the section steel at the joint section, each of the adjacent section steel sections is positioned as follows:
It is composed of joint steel such as channel steel, H-beam or I-beam,
A joint reinforcing steel made of a shaped steel or a square steel pipe is installed in the joint closed space formed by the adjacent joint steel, and both joint steels are bolted through the joint steel and the joint reinforcing steel. 2. A structure in which a steel bar is joined, a reinforcing bar is arranged on the upper side of the joint member in a direction perpendicular to a longitudinal direction thereof, and concrete is filled.
The joint structure of the composite floor slab described in the above. 6. As means for enhancing the rigidity of the joint in the longitudinal direction of the section steel, a stopper is welded to the upper surface of the end of both adjacent steel bottom plates, and an opening is provided so as to penetrate the stopper. A steel plate is placed on the end of one of the adjacent steel bottom plates by bolting or welding, and a stopper is welded to the upper surface of the end of the other steel bottom plate. 2. The joint according to claim 1, wherein the slip stopper is penetrated through an opening provided on one side of the steel plate, and a reinforcing bar is arranged in a direction perpendicular to a longitudinal direction of the section steel and filled with concrete. Part structure.