JPH09209500A - Prefabricated reinforcement member for rc structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive to save the manhour of work by arranging a plurality of steel bars in parallel with a definite spacing and stretching a connecting member to a plurality of locations which intersect with the axis of each steel bar at right angles. SOLUTION: A plurality of steel bars 1 are arranged in parallel. Each steel bar thus arranged is integrally connected with a connecting member 2, thereby producing an unit reinforcement member which is integrated and square-shaped on the plane. These reinforcements are prefabricated at a shop. This unit prefabricated reinforcement member is rolled up and packaged. A plurality of units of the unit packaged reinforcing member are shipped to a construction site. Then, the rolled up packages are opened on the construction site where they are laid out so that each unit package of reinforcement member may cross each other. Then, a clip type connector is preliminarily mounted on the connecting member 2, thereby combining integrally the points of intersection with each steel bar 1. It is, therefore, possible to place reinforcing bars with high efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pre-assembled rebar member used for an RC structure (reinforced concrete structure). Especially, labor saving of on-site rebar assembly work,
The present invention relates to a packaging type pre-assembled rebar member by a pre-assembly method capable of improving efficiency, improving quality, and shortening the construction period.

[0002]

2. Description of the Related Art The characteristics of RC structures are that they can be constructed as an integral structure, that main structural parts can be freely reinforced, and that if the bar arrangement is proper, they can exert a strong resistance to bending moments. Moreover, it is relatively rich in toughness. Therefore, it is used for various building civil engineering structures.

On the other hand, there is a drawback in that the weight of the joint is large and the processing of joints is troublesome and the construction becomes complicated. Among them, in the assembly of on-site rebar, it is difficult to secure on-site personnel called rebar or rebar, and it is difficult to thoroughly manage on-site rebar technology, which is a major problem in terms of seismic structure.

Therefore, as one means for solving this problem, a method called a pre-assembled rebar construction method has been developed in which the rebar is preassembled in advance, that is, it is prefabricated and brought into the field and assembled. What is called a welded wire mesh is a typical example.

By the way, in this so-called welded wire net, as shown in FIG. 6, linear iron wires are made orthogonal to each other in the vertical and horizontal directions to form a net, that is, a grid,
All intersections are integrally joined by resistance welding. The external appearance is a quadrilateral lattice-like sheet as shown.

That is, the required number of the sheet-like wire nets is assembled in a factory in advance, and is carried into the site to have a desired rebar structure.
After that, concrete was poured and constructed. As a result, it is evaluated as being useful for shortening the construction period and improving the quality, as compared with the conventional method of bringing in the material reinforcing bars to the site and assembling them one by one by hand.

[0007]

However, in this prefabricated welded wire mesh, the size of the wire used is as defined in the standard of JIS G3551 (1988).
It is specified to be 9.00 mm or less, the application range as an RC structure is limited, and there is a limit to the use for a large RC structure.

A further problem is that the welding wire mesh itself is a wire mesh having a lattice pattern, that is, the plane is a quadrilateral wire mesh.
There were the following problems in transporting the welded wire mesh from the factory to the site and arranging it in a predetermined position. First, when transporting from the factory to the site, you have to rely on trucks and the like. For that reason, it was necessary to fit it in a stackable size (vertical / horizontal width). In other words, it was limited in manufacturing size. Then, when the transferred welded wire mesh is to be installed at a predetermined setting position, that is, because it must be lifted and installed in a quadrilateral state, for example, when it is used as a slab streak for a high-rise building structure, it hits the frame structure part. There were cases where it hindered the lifting work and hindered the smooth deployment of the carry-in setting work.

Further, when there is a support or an opening in the setting site, a part of the welding wire mesh (sheet-like wire mesh) itself is cut off so that the welding wire mesh can be applied to the opening around the support pillar. Need to be molded. However, in the conventional welded wire mesh, the wire rods are crossed in the vertical and horizontal directions to form a grid, as described above.Therefore, in particular, both the vertical and horizontal wire rods of the lap joint are cut and the concrete thickness is increased. It was necessary to process so that it could handle.
In other words, since it is prefabricated as a grid pattern welded wire mesh, the advantage in building work is exhibited, but depending on the setting site, it is necessary to combine and construct welded wire mesh of various sizes, which is a negative factor in construction. As it was. Due to the circumstances described above, the prefabricated reinforcing bar method is becoming difficult to spread in manufacturing and construction.

The present invention solves the problems of such prefabricated pre-assembled rebars, and transports them from the factory to the site,
Setting work (reinforcing bar assembly) at a predetermined place on site can be done in the same way as general reinforcing bar construction, and it is a pre-assembled method that can develop highly accurate pitch bar construction, and for package type RC structures It was developed for the purpose of providing a reinforcing bar member.

[0011]

In order to achieve the above-mentioned object, the present invention firstly arranges a plurality of RC structure steel bars in parallel at a constant interval and orthogonally intersects the axis of the arranged steel bars. Connect the connecting members to multiple places,
The connecting point of this connecting member and each steel bar is connected to connect the plurality of steel bars in parallel and integrally with the connecting member.
It is characterized in that it is configured as a pre-assembled rebar member for a C structure.

For example, in the case of constructing a slab made of reinforced concrete, first, the plurality of steel bars are arranged in parallel, and the arranged steel bars are integrally connected by a connecting member so as to have a quadrilateral planar shape. The assembled unit reinforcing bar members are preassembled at the factory. Then, the unit-assembly rebar member is wound in a roll shape and packaged. Then, a plurality of the united pre-assembled rebar members that have been packaged are loaded to a construction site, and the necessary units are loaded on a truck or the like and shipped to the site.

At the construction site, roll-shaped packages are opened and laid out. At that time, the rebar members of each unit package are laid out so as to cross each other. In other words, they are laid out so as to form a grid-like reinforcement. Then, the intersections where the reinforcing members of the unit packages intersect are integrally connected, that is, they are connected in accordance with the procedure of the ordinary reinforcing bar construction, and then concrete is poured to perform the desired slab concrete construction. It is a thing.

As the RC structural steel bar, JI
It goes without saying that round or deformed steel bars for reinforced concrete based on the S standard or even commercially available steel bars are used.

As the connecting member extending at a plurality of positions orthogonal to the axis of the steel bars arranged in parallel, a connecting member made of synthetic resin or metal, for example, in the form of a cord or a band is used.

Further, the intersections of this connecting member and the respective steel bars arranged in parallel are integrally connected. As the joining means, welding (resistance welding) or a binding wire (a wire for binding) was used to integrally join at the stage of factory production.

When the connecting member is composed of a strip of thin metal, it may be joined to each steel bar by welding.

Further, a clip type fitting may be attached to the connecting member in advance, and the intersection of the connecting member and each steel bar may be integrally joined via the connecting fitting. In any case, it suffices that the interval between the steel bars arranged in parallel is held by the connecting member.

Further, when the rebar members having the above-mentioned structure are bound in a roll form and shipped as a rebar member of RC structure, from the viewpoint of maintaining the quality of the rebar member, waterproof paper or the like is used for packaging and shipping. It is preferable.

Then, the roll-shaped unit pre-assembled rebar members carried into the site are unpacked at the site one by one, spread and laid. At that time, the reinforcing bars in the unit package are laid out in a manner that they intersect at right angles. As a method of joining reinforcing bars to each other in a unit package, there are legal standards for conventional reinforcing bar joints, such as the Building Standards Law Construction Order No. 7
Article 1-79 Particularly, the joint structure defined in Article 73 and the joint structure according to it are used. By the way, lap joints, gas pressure welded joints, mechanical joints, and weld joints were used.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be specifically described based on the embodiments shown in the drawings. First, FIG.
It is a perspective view showing the composition of the unit pre-assembled rebar member for RC structures by this invention. That is, it is a perspective view of a unit rebar member assembled in advance in a factory. By the way, the width H and the length L as the unit pre-assembled rebar members are determined by the construction site, but in this embodiment, the width H is up to 4
m and the length L was 9 m. The size of the steel bar used was 6 to 13 mm. The dimensional values are limited because they are considered to be transported to the site by truck or the like.

Further, the pitch P between the steel bars 1 is 100.
The pitch was set to be equal to about 300 mm. Of course, the above design conditions are merely examples, and appropriate values are selected on a case-by-case basis depending on the RC structure to be constructed.

The connecting member 2 for connecting the positions orthogonal to the axis of the steel bars arranged in parallel is 4 in the drawing.
I made it a point. Of course, this number is also set according to the length L of the steel bar used.

Next, in the figure, as a connecting means of the connecting member 2 to each of the arranged steel bars 1, they are integrally connected by electric resistance welding. Of course, as described above, binding may be performed using a binding wire.

FIG. 2 shows another connecting means in the case where a clip-type connecting metal fitting 3 is provided on the side of the connecting member 2 in advance and the steel bar 1 is fitted into this connecting metal fitting 3 to be connected. The clip itself has a U-shaped fitting portion with a spring plate. Of course, it is not limited to this.

FIG. 3 is a perspective view showing a packaged form of the pre-assembled reinforcing bar members in a unit package (unit pre-assembled reinforcing bar member). The member can be easily suspended at the construction site by packaging in view of the object of the present invention. In addition, the construction work and the laying work can be done by one person, and it is possible to solve the drawbacks of the conventional welded wire mesh, such as the reinforcement work of particularly large size members.

FIG. 4 is a vertical cross-sectional view showing an example of the bar arrangement of the floor slab in which the package is opened and built in the site and the bar is reinforced as the floor slab reinforcing bar. 5 is a lower rebar, 6 is an upper rebar. Further, FIG. 5 is a plan view showing a bar arrangement condition by the unit pre-assembled reinforcing bar members A and B when there is an opening in the floor slab. The thin rebar around the mouth of the opening is the reinforcement.

[0028]

As described above, according to the present invention, since a plurality of steel bars are integrally connected by a connecting member and can be wound into a roll to be packaged, the weight and size of the unit package ( (Length) can be standardized and productivity can be improved. Therefore, if you package it in the desired size considering the convenience of transportation to the site, installation at the construction site on the site, and carry-in, the inconveniences such as those seen in the welded wire mesh described above will not occur. Will be resolved. In addition, for example, when constructing a wide floor slab, and if there are struts or openings in the construction site, in the conventional bar arrangement construction with welding wire mesh, wire rods (reinforcing bars) in the vertical and horizontal directions in the unit welding wire mesh. Since it was integrated, it was necessary to manufacture both wire rods (reinforcing bars) to a special size and perform bar arrangement work corresponding to the columns and openings. However, in the present invention, since the unit pre-assembled rebar member is constituted by rebars in only a fixed direction, that is, in the longitudinal direction, wire rods (rebars) in both the longitudinal direction and the lateral direction, as seen in the conventional welded wire mesh. Not only does it require special size and shape products, but it is also possible to construct diamond-shaped bar arrangements that are particularly effective in terms of earthquake resistance, and structurally excellent bar arrangements can be efficiently carried out.

[Brief description of drawings]

FIG. 1 is a perspective view of a unit pre-assembled rebar member for an RC structure according to the present invention.

FIG. 2 is an enlarged vertical cross-sectional view of a joint portion in which a crossover portion between a steel bar and a joint member is joined to a joint member (strip-shaped band) of a unit prefabricated rebar member via a clip-type joint fitting.

FIG. 3 is a perspective view showing a package shape at the time of shipment in which a unit pre-assembled rebar member packed in a roll shape is wound into a roll shape.

FIG. 4A is a vertical cross-sectional view of a floor slab in which a plurality of unit pre-assembled reinforcing bar members packed in a roll shape are spread at the site and constructed as a floor slab rebar, and FIG. 4B is a reinforcing bar diagram thereof.

FIG. 5 is a plan view showing an example of bar arrangement of the pre-assembled reinforcing bar member when the floor slab has an opening.

FIG. 6 is a partial plan view of a prefabricated rebar member called a conventional welded wire mesh (pre-assembly).

[Explanation of symbols]

 1 ... Steel bar (rebar) 2 ... Connection member 3 ... Coupling metal H ... Width of unit pre-assembled rebar member L ... Length of unit pre-assembled rebar member

Claims (4)

[Claims] 1. A plurality of steel bars for RC structures are arranged in parallel at a constant interval, and connecting members are provided at a plurality of positions orthogonal to the axis of each arranged steel bar, and the intersections of the connecting members and the respective steel bars. RC characterized by being integrally connected
Pre-assembled rebar members for structures. 2. The pre-assembled rebar member for an RC structure according to claim 1, wherein the connecting member is a string-shaped or band-shaped connecting member made of a synthetic resin or a metal material. 3. The pre-assembled rebar member for an RC structure according to claim 1, wherein an intersection of the connecting member and each steel bar is integrally joined by welding or a binding wire. 4. The pre-assembled rebar member for an RC structure according to claim 1, wherein an intersection of the connecting member and each steel bar is integrally connected via a clip-type connecting fitting.