JP2000355910A - Space truss with concrete extra form for civil engineering such as bridge floor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a space truss with a concrete extra form for civil engineering used in the case of construction such as a bridge floor in which the reinforcement machining and reinforcement arrangement of the bridge floor on a field are omitted and the assembly and disassembly removal operation of a bridge- floor form can be eliminated approximately. SOLUTION: The space truss with the concrete extra form is composed of three-dimensional welding reinforcement 1 formed by combining vertical reinforcements 11, horizontal reinforcements 12 and wave reinforcements 13 and a reinforced concrete slab 2 in which concrete is placed in the lower section of the three-dimensional welding reinforcement 1 and formed in specified size. The three-dimensional welding reinforcement 1 in which the vertical reinforcements 11 of the three-dimensional welding reinforcement 1 are projected from the concrete slab 2 and connecting sections 3 are formed may be manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional truss with a concrete dumping formwork for civil engineering used when constructing a bridge floor of a bridge having a road width of about two lanes.

[0002]

2. Description of the Related Art Conventionally, when constructing a bridge deck of a large-scale bridge, it has been laid sequentially on a bridge girder using a precast (concrete lithography containing steel material). Also, when the bridge girder is curved or inclined, the precast has been designed by designing one by one according to the original shape of the bridge and laying the precast one by one. Therefore, it took much time and cost until the precast was manufactured. In addition, since this precast is large and heavy, it is quite difficult to transport the precast to the site or lay it down on the site because it requires advanced technology, so it is quite difficult to construct a small bridge with a road width of about two lanes. In this case, even if the above-mentioned precast is used, the profitability does not match, so that the bridge deck is hardly constructed at present. For this reason, when constructing a general bridge deck that does not use precast, a wooden formwork for the bridge deck is assembled on the bridge girder at the site and rebar arrangement work is performed, and then concrete placement and curing is performed. After that, the wooden formwork was dismantled and removed to form the bridge floor.

[0003]

However, in the above-mentioned general method of constructing a bridge deck, since wood is used for the formwork, a large amount of unnecessary wooden formwork material is generated, so that disposal of the material is necessary. And caused environmental problems. In addition, since the assembling work of the wooden formwork and the reinforcing bar reinforcing work are performed on site, the construction period is affected by the weather, and many workers are required. Furthermore, since the wooden formwork is dismantled and removed after the concrete is placed and cured, it is difficult to shorten the construction period, reduce costs and save labor.

[0004] The present invention omits rebar processing and reinforcement of bridge floors and the like performed on site, and can substantially eliminate assembling and disassembly and removal of formwork such as bridge floors for civil engineering used in the construction of bridge floors and the like. It is an object of the present invention to provide a three-dimensional truss with a concrete dumping formwork.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, that is, a three-dimensional welded reinforcing bar formed by combining vertical streaks, horizontal streaks and wave streaks, and the three-dimensional welded bar It is composed of a concrete slab of a reinforcing bar formed by casting concrete under the reinforcing bar to have a predetermined size. Further, it is preferable to provide a connecting portion by protruding the vertical bars of the three-dimensional welding reinforcing bar from the concrete plate.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 3 show an embodiment of the present invention. (1) is a three-dimensional welded reinforcing bar formed by combining a vertical bar (11), a horizontal bar (12), and a wave bar (13), and the three-dimensional welded bar (1) is a vertical bar (11) and a horizontal bar (12). Are perpendicular to each other and are fixedly welded to each other so that a flat lattice portion of a predetermined size is
After the two sheets are stacked, the wave streaks (13) are fixed along the upper and lower vertical streaks (11) so that the upper lattice part floats at a predetermined height. The shape of the three-dimensional welded reinforcing bar (1) obtained by combining the vertical bar (11), the horizontal bar (12) and the wave bar (13) is not limited to the above. (2) is a concrete plate of a reinforcing bar formed by casting concrete under the three-dimensional welded reinforcing bar (1) to a predetermined size, and the position of the vertical bar (11) embedded in the concrete plate (2). Is 3 cm or more from the bottom surface of the concrete slab (2). At this time, if it is 3 cm or less from the bottom surface, the thickness from the reinforcing bar required for the concrete structure is insufficient, and it cannot be used as a residual formwork as it is. In addition, the concrete plate (2)
Before being transported to the site, a three-dimensional welded reinforcing bar in the factory in advance (1)
Is formed integrally with the lower part of

FIG. 2 is a view showing another embodiment of the present invention, which is different from the above-described embodiment in that the upper vertical streak (11) is used.
Are long and easy to connect, and the connecting portions (3) are provided by projecting the vertical streaks (11) from the concrete slab (2). Others are the same as the above embodiment.

Next, a method of using the product of the present invention will be described for a case where a bridge floor is constructed. First, the concrete plate (2) of the present invention is laid on the flange portion (41) of the steel girder (4). Then, the ends of the adjacent three-dimensional welded reinforcing bars (1) are connected with each other by being tightly connected with an iron wire, or temporarily fixed and fixedly connected by welding. In this way, all the products of the present invention are set. After setting, concrete is poured from above the three-dimensional welded reinforcing bar (1) to obtain a reinforced concrete floor having a predetermined thickness (see FIG. 4). When a conventional precast is used, the imaginary line shown on the right side in the figure is equivalent to the thickness of the precast, which is substantially the same as the predetermined thickness of the cast concrete shown on the left side in the figure. In the present invention, the thickness of the concrete slab (2) is about 1/3 to 1/5 smaller than that of the precast, so that it can be easily transported and suspended.

[0009]

The present invention having the above-described structure has the following effects.

According to the first aspect of the present invention, the longitudinal stripes (11) and the horizontal stripes (12) are provided.
And three-dimensional welded reinforcing bar (1)
By forming a concrete slab (2) of a predetermined size integrally under the three-dimensional welded reinforcing bar (1), the mass can be standardized and mass-produced in a factory, so that the quality is stabilized. In addition, if the construction of a bridge floor or the like is performed using the product of the present invention, the concrete slab (2) can be used as a disposal formwork also serving as a work floor. It is possible to greatly reduce the number of rebar arrangement work, and it is possible to perform the construction safely and promptly even for amateurs. Therefore, when the product of the present invention is used for civil works such as bridge decks, the work can be simplified and leveled, and the effects of labor saving, shortening of construction period, cost reduction, etc. can be enhanced. Moreover, since no wooden formwork is used, it can contribute to the protection of forest resources.

According to a second aspect of the present invention, the three-dimensional welding reinforcing bar (1)
The vertical streak (11) and the horizontal streak (12) are orthogonalized, and they are welded and fixed to each other.
The upper and lower grids are fixed along the upper and lower vertical streaks (11) so that the upper lattice part floats at a predetermined height after the two sheets are stacked. Also becomes a solid space truss. Therefore, the weight can be reduced,
Transportation and construction are easy, and costs can be reduced.

According to a third aspect of the present invention, the buried longitudinal streaks (1
The position of 1) is 3cm from the bottom of the concrete slab (2).
By the above, the concrete slab (2) itself can be left instead of the formwork, and therefore, by laying the product of the present invention on a bridge girder (4) or the like, formwork work and rebar work can be performed. Can be constructed simultaneously.

According to a fourth aspect of the present invention, a three-dimensional welded reinforcing bar is provided.
Vertical streaks (11) of the concrete slab (2)
By providing the connecting portion (3), the connecting portions (3) are overlapped with each other without using another reinforcing bar, and the connecting portions (3) are connected with each other by tightening them with an iron wire or temporarily fixed and connected by welding. This can be performed as an extremely simple connection operation.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing another embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a cross section of the present embodiment.

FIG. 4 is an explanatory diagram showing a use state of the present invention and a difference from a precast.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Three-dimensional welded reinforcing bar 11 Vertical bar 12 Horizontal bar 13 Wave bar 2 Concrete plate 3 Connection

Claims (4)

[Claims] 1. A longitudinal line (11), a horizontal line (12) and a wave line.
A three-dimensional welded reinforcing bar (1) formed by combining (13) and a concrete plate (2) of a reinforcing steel bar formed by casting concrete under the three-dimensionally welded reinforcing bar (1) to have a predetermined size. A three-dimensional truss with a concrete dumping formwork for civil engineering such as bridge floors. 2. The longitudinal reinforcing bar (11), wherein the three-dimensional welding reinforcing bar (1) is a longitudinal reinforcing bar (11).
And the horizontal streaks (12) are made orthogonal to each other, and they are welded and fixed to form two flat lattice portions of a predetermined size for up and down use, and the two lattices are stacked, and the upper lattice portion floats at a predetermined height. The three-dimensional truss with a concrete dumping formwork for civil works such as a bridge floor according to claim 1, wherein the wave streaks (13) are fixed along the upper and lower vertical streaks (11) as described above. 3. The position of the buried vertical streaks (11) is at least 3 cm from the bottom surface of the concrete slab (2).
3D truss with concrete dumping formwork for civil engineering such as the bridge floor described in 1. 4. The civil engineering work such as a bridge floor according to claim 1 or 2, wherein a vertical bar (11) of the three-dimensional welded reinforcing bar (1) is protruded from the concrete slab (2) to provide a connecting portion (3). Truss with concrete dumping formwork.