JPS6231136B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an assembled reinforcing bar and a method for manufacturing the same.

Conventionally, reinforcing steel reinforcement work in reinforced concrete construction required a great deal of labor as each reinforcing bar was manually transported to a predetermined position and assembled into the required cross-sectional shape.

In recent years, due to the shortage of labor and the aging of workers, various pre-assembled reinforcing bar cages have been proposed for pre-assembling reinforcing bars, automatic assembly, etc., as part of efforts to save labor in reinforcing bar construction. It is like the assembled reinforcing bar cage 1 of columns and beams shown in .

This is done by fixing both ends A and B of the main reinforcing bars 2 with mechanical jigs (not shown), then welding band plates 3 to both ends to hold the designed cross section, and then using hoop bars or stirrups. Wrap the wire 4 and tie it, release the fixed end above and attach the basket 1.
Let's take it out.

However, with such means, the degree of freedom of the cross-sectional shape is greatly restricted by the fixing jigs at both ends, and the fixing grips must have some play when attaching the reinforcing bars, making it difficult to assemble the frame. Care must be taken to ensure the dimensional accuracy of the reinforcing bar spacing required for vertical installation.
Alternatively, since only both ends are fixed, it is not possible to ensure sufficient spacing between reinforcing bars in the center, and furthermore, the hoop or stirrup bars 4 hardly contribute as shear reinforcement for the cage 1, which is a three-dimensional frame. Therefore, the basket 1 lacks rigidity and has poor self-reliance, resulting in problems such as deformation during storage and transportation.

The present invention has been made in view of the above circumstances, and its gist is that in assembled reinforcing bars as a main reinforcement three-dimensional frame before wrapping hoop or stirrup bars, for example, in the case of a beam, the top chord The opposing upper and lower end units, which are constructed by connecting the side main reinforcements and the lower chord side main reinforcements with plates or flat bars arranged at regular intervals, are made into flat bars with the arrangement interval of the plates or flat bars set in one cycle. Alternatively, by combining round steel or deformed steel bars with a lattice material made by bending, it is possible to provide sufficient shear-resistant rigidity to ensure dimensional accuracy of reinforcing bar spacing over the entire length. At the point.

Details of this will be explained below based on embodiment figures.

That is, FIGS. 2a and 2b show, for example, an upper end unit constructed by connecting the upper chord main reinforcements 5, 5 and the lower chord side main reinforcements 6, 6 of a beam with plates or flat bars 7 arranged at regular intervals. 8 and a lower end unit 9, and the relative arrangement of the plates or flat bars 7 in both is in a staggered relationship in accordance with the lattice material bonding described later.

In addition, figure c shows the plate or flat bar 7.
A lattice material 10 is shown in which a flat steel, a round steel, or a deformed steel bar is bent and formed with the coordination interval of .

Figure d shows a main reinforcement three-dimensional frame structure before hoop reinforcement or stirrup reinforcement is wound, which is constructed by joining the upper end unit 8 and the lower end unit 9 by welding the bent portion 10a of the lattice material 10 with the plate or flat bar 7. The assembled reinforcing bars 11 are shown as follows.

If necessary additional main reinforcement, hoop reinforcement, or stirrup reinforcement is attached to this, it becomes an assembled reinforcing bar cage.

As described above, according to the present invention, the sizes of the cross sections of the columns and beams are determined by the plates or flat bars 7 and the lattice material 10, so that their adjustment is simple and flexible.

In addition, if the column/beam width is particularly large, use lattice material 1.
It is sufficient to stiffen the reinforcing bar cage 12 by attaching the reinforcing bars 0 at two or more locations, and an example of this is shown in FIG. 3.

The present invention configured as described above provides various effects as described below.

(1) Since the rigidity of the assembled reinforcing bars is increased by the presence of lattice material, deformation does not occur when hoop or stirrup bars are wrapped, when transported from the factory to the site, and when lifted by heavy machinery at the site. , no damage will occur.

(2) The main reinforcing bars at the protruding corners can be easily and precisely joined in advance, and in combination with the lower end units 8 and 9 and the lattice material 10 that forms an accurate spacer,
Since the columns and beams can be reliably fixed in the correct position over the entire length, assembly accuracy can be easily ensured.

(3) Additionally, since the lattice material 10 is effective against shear force, it increases the strength of the columns and beams.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional assembled rebar cage, Figure 2a
-c are each component of the present invention, d is a plan view, perspective view, and end view of each component assembly, and FIG. 3 is a perspective view of an assembled reinforcing bar cage according to the present invention. 5... Main muscle on the superior chord side, 6... Main muscle on the inferior chord side, 7
... Plate or flat bar, 8 ... Upper end unit, 9 ... Lower end unit, 10 ... Lattice material, 10a ... Bent part, 11 ... Assembly reinforcing bar.

Claims (1)

[Claims] 1 For example, in the case of a beam, upper and lower ends facing each other are constructed by connecting main reinforcements on the upper chord side and between main reinforcements on the lower chord side with plates or flat bars arranged at regular intervals. Before winding hoop or stirrup bars, the unit is constructed by connecting the plates or flat bars with a lattice material made by bending and forming flat steel, round steel, or deformed steel bars so that the arrangement interval of the plates or flat bars is one cycle. Assembling reinforcing bars as the main reinforcement three-dimensional frame structure. 2 For example, in the case of a beam, the upper chord side main reinforcements and the lower chord side main reinforcements are connected by plates or flat bars arranged at regular intervals to form the upper and lower end units facing each other, and the plates Alternatively, the lattice material is constructed by bending and forming flat steel, round steel, or deformed steel bars with the arrangement interval of the flat bars set to one cycle, and then welding the bent portions of the lattice material to the plates or flat bars of the upper and lower end units. A method for manufacturing assembled reinforcing bars as a main reinforcement-based frame before wrapping around hoop or stirrup bars.