JP3984911B2 - Floor structure material - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a formwork used for construction of a concrete floor slab, a self-supporting truss, and a floor structure material including voids, and more particularly to a structure for fixing voids.
[0002]
[Prior art]
When constructing a floor slab by placing concrete using a floor structure material consisting of a formwork and a self-supporting truss, voids are buried in the floor slab to reduce the weight of the slab and to wire and pipe it. Building floor slabs is being implemented.
[0003]
Japanese Laid-Open Patent Publication No. 2001-303707 proposes a floor structure material in which a void is fixed to a floor structure material made of a mold and a self-supporting truss.
[0004]
As shown in the front view of FIG. 8, one upper chord 11 and two lower chords 12 are arranged in parallel vertically, and the upper bent portion of the two lattice muscles 13 bent into a waveform is the upper chord 11. And the lower part of the two lattices 13 is welded to the lower chord 12 and the lower bent part 15 is bent horizontally to form the self-supporting truss 1, and the lower bent part 15 of the self-supporting truss 1 Is welded to a mold 2 made of an iron plate to form a floor structure material.
[0005]
In this floor structure material, in order to fix the void 8 between the self-supporting trusses 1 arranged in parallel, the bent portions 61 at both ends of the support muscle 6 bent in an arc shape supporting the lower side of the void 8 are provided. The void 8 is placed on the support muscle 6 over the upper chord 11 of the adjacent self-supporting truss 1.
[0006]
When placing concrete, buoyancy acts on the void 8 due to the concrete having a large specific gravity, so that it floats up. Therefore, in order to press the upper side of the void 8, the presser bar 7 bent in an arc shape is placed on the upper side of the void 8. The bent portions 71 at both ends of the presser bar 7 are stretched over the lower chord 12 of the adjacent self-supporting truss 1 to fix the void 8.
[0007]
[Problems to be solved by the invention]
According to such a void support structure, the support bars 6 and presser bars 7 of various dimensions must be prepared in order to be applied to the voids 8 having different intervals or different thicknesses. The muscle 6 and the presser bar 7 had to be handed over. The present invention has been conceived to solve such problems.
[0008]
[Means for Solving the Problems]
The floor structure material of the present invention is a floor structure material in which a plurality of parallel self-supporting trusses are fixed to a formwork, and a U-shaped void attachment having a flat bottom surface obtained by bending a steel strip in the middle of adjacent self-supporting trusses. Place the member, fix the flat bottom surface of the void mounting member to the formwork, drop the void into the U-shaped opening of the void mounting member, and place the open end of the void mounting member along the side of the void It is bent and spot welded near the end to fix the void.
[0009]
The floor structure material according to another embodiment of the present invention is a floor structure material in which a plurality of parallel self-supporting trusses are fixed to a formwork. Bend both sides upward in a U-shape, bend one rising part inward at a predetermined height from the bottom, and then place two oppositely bent void mounting members facing each other. Fix the flat bottom surface to the above-mentioned formwork, drop the void into the two opposing arc surfaces of the void mounting member, bend the open end of the void mounting member along the side of the void, and spot near the end The void is fixed by welding.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
As shown in FIG. 1 (a), an iron plate mold 2 having a plurality of parallel groove molds such as a deck plate, a keystone plate, and a rib plate is prepared in advance, and one upper chord 11 and two The lower chord 12 is arranged in a triangle, and two lattice muscles 13 bent in a wave shape are attached to the mountain shape so that the upper chord 11 is sandwiched between the upper bent portions 14, and the upper flexion of both lattice muscles 13 A self-supporting truss 1 is prepared by welding the portion 14 to the upper chord muscle 11 and welding the lower part of both lattice muscles 13 to the two lower chord muscles 12 respectively.
[0011]
Then, a plurality of self-supporting trusses 1 are arranged in parallel on the mold 2 and the lower bent portions 15 of both lattice bars 13 of the self-supporting truss 1 are welded to the mold 2 to form a floor structure material.
[0012]
As shown in FIG.1 (b), the steel strip is bent and the U-shaped void attachment member 3a which has the flat bottom face 31 is made.
[0013]
Alternatively, as shown in FIG. 1C, the steel strip is bent to make an L-shaped void attachment member 3b having a flat bottom surface 31.
[0014]
Then, as shown in FIG. 2, a plurality of the void attachment members 3 (3a or 3b) are placed in the middle of the adjacent self-supporting truss 1 in a direction intersecting the self-supporting truss 1, and a flat bottom surface 31 is formed on the mold 2 Weld and fix it on the top surface.
[0015]
As shown in FIG. 3, a positioning rebar 16 is inserted over the lower chord 12 of the self-supporting truss 1 so as to cross a plurality of self-supporting truss 1 arranged in parallel, and a void mounting member 3 having a U-shape is formed. The void 8 is placed on the positioning rebar 16 after passing through the open end 32.
[0016]
As shown in FIG. 4, the open end 32 of the void attachment member 3 is bent so as to be along the side surface of the void 8, and the void 8 is fixed by spot welding 鋲 or pinching near the end.
[0017]
And this floor structure material is bridged between the cross beams, and the floor slab is constructed by placing concrete with the iron plate 2 being discarded as a formwork.
[0018]
(Second Embodiment)
In the first embodiment, the reinforcing bar 16 for positioning the void 8 is required in addition to the void mounting member 3. However, in the second embodiment, the void 8 is positioned by the void mounting member 4. It is composed.
[0019]
As shown in FIG. 5, the void mounting member 4 is formed by bending a steel strip. As shown in FIG. 5 (a), both sides of the portion that becomes the flat bottom surface 41 are U-shaped upward. Bending, as shown in FIG. 5 (b), one rising portion 42 is bent inward from the bottom surface at a height D, and further bent into an arc shape to form a receiving surface 43.
[0020]
Further, as shown in FIG. 5 (c), as the void attachment member 4, a steel strip previously formed in a loop shape is bent to form a flat bottom surface 41 and an arcuate void receiving surface 43. It may be.
[0021]
As shown in FIG. 6, a plurality of two void attachment members 4 are placed in the direction intersecting the self-supporting truss 1 in the middle of the adjacent self-supporting truss 1 so that the receiving surfaces 43 bent in an arc shape face each other. Each flat bottom surface 41 is fixed to the upper surface of the mold 2 by welding or clamping.
[0022]
Thus, when the two void attachment members 4 are opposed and fixed, the two arcuate receiving surfaces 43 form a substantially semicircular void receiver, and the void 8 is placed thereon. At this time, the void 8 is positioned at a height D from the mold 2.
[0023]
As shown in FIG. 7, the open end 44 of the void attachment member 4 is bent so as to be along the side surface of the void 8, and the void 8 is fixed by spot welding near the end.
[0024]
And this floor structure material is bridged between the cross beams, and the floor slab is constructed by placing concrete with the iron plate 2 being discarded as a formwork.
[0025]
【The invention's effect】
As is clear from the description based on the above embodiment, the void attachment member in the present invention can be applied to voids having different thicknesses even if the interval of the self-supporting truss 1 is changed, and The void can be easily attached by welding.
[Brief description of the drawings]
FIG. 1A is a front view showing a floor structure material in which a self-supporting truss is fixed to a mold, and FIG. 1B is a front view showing a first embodiment of a void mounting member of the present invention;
FIG. 2 is a front view showing a state in which the void mounting member of the present invention is fixed to a floor structure material;
FIG. 3 is a front view showing a state in which a void is placed on a floor structure material having a void mounting member of the present invention;
FIG. 4 is a front view showing a state in which the void is fixed to the floor structure material by the void mounting member according to the first embodiment of the present invention;
FIG. 5 is a front view showing the processing steps of the second embodiment of the void attachment member of the present invention;
FIG. 6 is a front view showing a state in which a void mounting member according to a second embodiment of the present invention is fixed to a floor structure material;
FIG. 7 is a front view showing a state in which the void is fixed to the floor structure material by the void mounting member according to the second embodiment of the present invention;
FIG. 8 is a front view showing an example of a state in which a void is fixed to a floor structure material by a conventional void attachment member.
[Explanation of symbols]
1 Self-supporting truss
11 First quarter muscle
12 Lower chord
13 Lattice muscle
14 Upper bend
15 Lower bending part 2 Formwork 3 Void mounting member 4 Void mounting member 8 Void

Claims (3)

In floor structure materials in which a plurality of parallel free-standing trusses are fixed to a formwork,
A void mounting member having a flat bottom surface obtained by bending a steel strip is placed between adjacent self-supporting trusses, the flat bottom surface of the void mounting member is fixed to the formwork, and a U-shaped opening of the void mounting member is provided. A floor structure material in which a void is dropped into a portion, the open end of the void attachment member is bent so as to follow the side surface of the void, and the void is fixed by spot welding near the end portion. In floor structure materials in which a plurality of parallel free-standing trusses are fixed to a formwork,
In the middle of the adjacent self-supporting truss, the steel strip was bent into a U-shape with the flat bottom part facing upward, and one rising part was bent inward at a predetermined height from the bottom, and then bent into an arc. Two void mounting members are placed facing each other, the flat bottom surfaces of the two void mounting members are fixed to the formwork, the voids are dropped into two opposing arc surfaces of the void mounting member, and along the side surfaces of the voids. The floor structure material characterized by bending the open end of the void mounting member so as to cause the spot to be spot-welded near the end and fixing the void. In floor structure materials in which a plurality of parallel free-standing trusses are fixed to a formwork,
Bending the steel strip previously formed in a loop shape in the middle of the adjacent self-supporting truss, and fixing the flat bottom surface of the void mounting member formed with a flat bottom surface and an arcuate receiving surface to the formwork The void is mounted on the arc-shaped receiving surface of the void mounting member, the open end of the void mounting member is bent along the side of the void, and the void is fixed by spot welding near the end. Floor structure material.

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