JPH073094B2 - Floor structural material - Google Patents

Description

TECHNICAL FIELD The present invention relates to a floor structure material used when forming a floor of a building.

[Conventional technology]

A conventional floor structure material includes a plurality of lattice materials, a plurality of support materials, and a deck plate. The support member is formed by alternately forming flat skirt portions and chevron portions, and the flat skirt portions are fixed to the deck plate. The lattice member is formed by connecting the upper chord member and the lower chord member with a bending member, and the upper chord member is supported by the chevron portion of the support member in an orthogonal state.

[Problems to be Solved by the Invention]

The upper chord member of the lattice material and the chevron portion of the supporting material are fixed by welding, but the lattice material is in a suspended state and thus has poor stability. For this reason, there is a risk that the lattice material may fall or bend when an operator climbs up to the floor structural material during construction. Further, when the worker moves on the floor structural material, it is necessary to provide a road board. Furthermore, since the direction of the lattice material is one direction, there is a problem that concrete cracks occur between the lattice materials and the like.

Further, at the time of construction of the floor structure material, the lower-end crack preventing reinforcing bars are placed on the lower chord members of the lattice members in an orthogonal state, but it was necessary to pass the reinforcing bars through a plurality of lattice members. For this reason, there is a problem that the work cannot be performed easily and the workability is deteriorated.

Therefore, an object of the present invention is to provide a floor structure material that prevents the lattice material from falling and bending, does not require a road plate, can prevent the occurrence of concrete cracks, and has good workability.

[Means for Solving the Problems]

The floor structure material of the present invention has a pair of lattice members in which upper chord members and lower chord members are connected by bending members, and each upper chord member is connected by a corrugated member and both ends of each upper chord member and lower chord member are paired. A box girder with a portal cross section is formed by connecting the gate girder end fixing materials of the box girder, and a plurality of box girders are mounted on the deck plate of a size that the gate end fixing material at both ends of this box girder protrudes. Are arranged in parallel, joined together through a spacer, and a plurality of crack preventing reinforcing bars whose end portions are retracted from the side ends of the deck plate are fixed to the lower chord member in an orthogonal state.

[Action]

A horizontal truss is formed by the upper chord member of the pair of lattice members and the corrugated member, and both ends of the pair of lattice members are positioned and fixed by the gate-shaped end portion fixing member. Therefore, it is possible to prevent the lattice material from falling down or bending. Further, the horizontal truss allows the worker to walk on the floor structure without using the road board. Furthermore, the corrugated material reinforces the space between the lattice materials and prevents cracks from occurring at this portion.

On the other hand, since the crack-preventing reinforcing bars placed on the lower chord member of the lattice material are fixed to the lower chord member in advance, workability is good. Also,
Since the end portion of the crack preventing reinforcing bar is set back from the side edge of the deck plate, the crack preventing reinforcing bar does not become an obstacle when the floor structural material is installed on the beam. Along with this, a portion without a reinforcing bar is formed in the connecting portion of the floor structure material, and it is possible to induce a crack in the concrete in this portion and prevent a crack from occurring in another portion through which the crack preventing reinforcing bar passes.

〔Example〕

A floor structure material according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

This floor structural material comprises a box girder 1, a spacer 2, a deck plate 3 and a crack preventing reinforcing bar 20.

The box girder 1 includes a pair of lattice members 4, 4 in which an upper chord member 5 and a lower chord member 6 are connected by a bending member 7, a corrugated member 8, and a pair of substantially C-shaped gate-shaped end portions in which an end portion 9a is bent inward. It consists of fixing materials 9,9. Specifically, each upper chord member 5, 5 is a corrugated member 8
Both ends of each upper chord member 5, 5 are supported by the upper side of the pair of gate-shaped end portion fixing members 9, 9. Further, both ends of each lower chord member 6, 6 are fixed to the inside of the pair of gate-shaped end fixing members 9, 9 to form the box girder 1 having a gate-shaped cross section. In this case, the joining position of the upper chord member 5 and the corrugated member 8 is located between the joining positions of the upper chord member 5 and the bending member 7. All the joints are fixed by welding. The spacer 2 is formed by alternately forming a mountain-shaped portion 10 having a flat top portion and a flat skirt portion 11. The deck plate 3 is formed by pressing a steel plate to form the chevron portion 10 of the spacer 2.
And the concave portion and the convex portion are provided in parallel so as to correspond to the flat skirt portion 11,
The side end 3a is bent. The length of the deck plate 3 in the direction of the uneven portion is formed to be slightly shorter than the length of the box girder 1, so that the gate-shaped end portion fixing material 9 protrudes from the deck plate 3. Reinforcing bar 20 for crack prevention is lower chord member 6
The end portion 20a is retracted from the side end 3a of the deck plate 3 in an orthogonal state.

Next, a procedure for assembling the floor structure material will be described. First, the flat skirt portions 11 of the spacer 2 are welded to the convex portions of the deck plate 3 at a predetermined interval. Next, spacer 2
The lower chord member 6 is placed on the top of the chevron portion 10 so as to be orthogonal to and welded to join the box girder 1. At this time, the gate-shaped end fixing members 9 provided at both ends of the box girder 1 are made to protrude from the deck plate 3 so that the end 9a of the gate-shaped end fixing member 9 and the deck plate 3 are substantially at the same level. Then, a plurality of crack preventing reinforcing bars 20 are welded by passing through the lower chord members 6 so as to be orthogonal to the lattice members 4.
Alternatively, the crack preventing reinforcing bars 20 may be first fixed to the lower chord member 6 and then the box girder 1 may be joined to the spacer 2. Further, in this case, two box girders 1 are arranged side by side, but the number of box girders 1 is not limited to this.

FIG. 5 shows an example of construction of this floor structure material at a construction site. That is, the gate-shaped end fixing member 9 of the floor structure and the edge of the deck plate 3 located inside the gate-shaped end fixing member 9 are placed on the beam 12 and welded. Then, a wire net 15 as shown in FIG. 7 is placed from above the lattice member 4 in the vicinity of the beam 12 to which the floor structural member is connected. This wire mesh 15 has upper end connecting bars 16
And a plurality of upper end force distribution bars 17 welded in a mesh form are prepared, and the upper end force distribution bars 17 are overlapped and welded. In this case, since the corrugated member 8 and the gate-shaped end fixing member 9 are fixed to the lower surface of the upper chord member 5 of the lattice member 4, the wire net 15 is easy to be placed and the stability is high. At other places, a wire mesh 25 as shown in FIG. 8 is placed on the lattice member 4. The wire netting 25 is formed by connecting both ends of the upper end force distribution bar 19 with fixed rebars 26 and welding the upper end force distribution bar 19 by overlapping.

According to this embodiment, since the crack preventing reinforcing bar 20 to be placed on the lower chord member 6 is attached in advance in the factory, the work at the site does not take much time and the workability is improved. Further, as shown in FIG. 5, since the end portion of the crack preventing reinforcing bar 20 is set back from the side end 3a of the deck plate 3, a part A without the reinforcing bar is formed, and concrete cracks are induced in this part A. be able to. Therefore, it is possible to avoid the occurrence of cracks in other parts. Further, since the end portion 9a of the gate-shaped end portion fixing member 9 is provided in the beam 12 direction, it can be laid even if the width of the beam 12 is narrow. The end 9a may be bent outward to form a hat shape. In addition, when transporting floor structural materials, gate-shaped end fixing materials 9
Is a gripping part and is easy to transport.

Also, after laying the floor structure material, when the worker walks on the floor structure material, the horizontal truss formed by the upper chord members 5, 5 of the pair of lattice members 4, 4 and the corrugated material 8 becomes the road plate. Instead. Along with this horizontal truss, a pair of lattice members 4, 4 with the gate-shaped end fixing member 9
Since both ends of the lattice member are positioned and fixed, the lattice member 4 does not fall or bend. Moreover, the corrugated material 8 can prevent concrete cracks from being generated between the lattice materials 4, 4.

〔The invention's effect〕

According to the floor structure material of the present invention, a horizontal truss is formed by the upper chord member and the corrugated member of the pair of lattice members, and both ends of the pair of lattice members are positioned and fixed by the gate-shaped end portion fixing member. Does not fall or bend when walking on the floor panel. Further, the horizontal truss allows the worker to walk on the floor structure without using the road board. Furthermore, the corrugated material reinforces the space between the lattice materials and prevents cracks from occurring at this portion.

On the other hand, the crack-preventing rebar, which has been placed on the lower chord member through the lattice material at the conventional construction site, is fixed to the lower chord member in a factory or the like in advance, so that there is no need to work on the site and the workability is good. Further, since the end portion of the crack preventing reinforcing bar is set back from the side edge of the deck plate, the crack preventing reinforcing bar does not interfere when the floor structural material is installed on the beam. In addition, along with this, a portion without a reinforcing bar is formed in the connecting portion of the floor structure material. For this reason, it is possible to induce concrete cracks in this portion and to prevent concrete cracks from occurring in other portions through which the crack preventing reinforcing bars pass.

[Brief description of drawings]

FIG. 1 is a front view of a floor structure material according to an embodiment of the present invention, and FIG.
The figure is a side view, FIG. 3 is a plan view, FIG. 4 is a front view showing a construction state of a floor structural material, FIG. 5 is a VV sectional view of FIG. 4, and FIG.
Fig. 6 is a sectional view taken along line VI-VI in Fig. 4, Fig. 7 is a plan view of a wire net installed near the beam, and Fig. 8 is a plan view of the wire net installed at a position apart from the beam. 1 ... Box girder, 2 ... Spacer, 3 ... Deck plate, 3a ... Side edge, 4 ... Lattice material, 5 ... Upper chord material, 6 ... Lower chord material, 7 ... Bending material, 8 ... Corrugated material, 9 ...
… Gate-shaped end fixing material, 20 …… Reinforcing bar for crack prevention, 20a…
…edge

Claims (1)

[Claims] 1. A pair of lattice members in which an upper chord member and a lower chord member are connected by a bending member are arranged in parallel, each upper chord member is connected by a corrugated member, and both ends of each upper chord member and a lower chord member are paired in a gate shape. A box girder with a gate-shaped cross section is formed by connecting with end fixing materials, and multiple box girders are installed side by side on the deck plate of a size that the gate-shaped end fixing material at both ends of this box girder protrudes. Then, the floor structure material is characterized in that a plurality of crack preventing rebars whose ends are set back from the side end of the deck plate are fixed to the lower chord member in an orthogonal state while being joined through a spacer.