JPH03464B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for fixing beam main reinforcements at joints between columns and beams.

As shown in Fig. 1, for example, H-shaped steel is used as the longitudinal aggregate 2 buried in the concrete column A',
Threaded reinforcing bars 1 are used as the main reinforcement of the beam, and the threaded reinforcing bars 1 are passed horizontally through the opposing face members (flanges of H-shaped steel) 2a, 2a of the longitudinal aggregate 2, and the screws are The facing surface material 2a,
There is a method of constructing columns and beams A' and B' by tightening 3a from both outside sides and then pouring concrete 4.

Although this method is superior in terms of the application process, it has the following drawbacks.

That is, when a tensile stress is applied to the threaded reinforcing bar 1 in the axial direction, as shown in FIG.
The threaded joint a of the threaded reinforcing bar 1 becomes a cam surface, and tensile stress acts to push and spread the concrete 4 around the threaded reinforcing bar 1, which has the disadvantage that the anchoring strength of the threaded reinforcing bar 1 to the concrete 4 decreases. Ta.

In order to overcome this drawback, as shown in FIG.
An excellent method of clamping was adopted.

According to this method, the threaded reinforcing bars 1 between the face materials 2a, 2a have a function as a stiffener, and there is an advantage that the fixing strength is increased.

However, the threaded reinforcing bar 1 is connected to the opposing face material 2a,
2a, when installing it on the facing surface material 2a, 2a
At the same time, the anchoring fittings 3, 3 are rotated and the threaded reinforcing bar 1 is moved in the longitudinal direction, or the anchoring fittings 3, 3 are held in a predetermined position and the threaded reinforcing bar 1 is rotated and moved in the longitudinal direction. This work requires a lot of manpower and many hours of work, resulting in poor workability and work efficiency.

An object of the present invention is to provide a new and useful fixing method that is almost the same as the method shown in FIG. 1, which is superior in terms of construction, but can achieve greater fixing strength.

Hereinafter, embodiments of the present invention will be described based on the drawings from FIG. 4 onwards.

In FIGS. 4 and 5, reference numeral 1 denotes a large-diameter threaded reinforcing bar with threaded joints a formed along its entire length in the longitudinal direction, which is used as the main reinforcement of the beam. 2 is a conventional aggregate made of H-shaped steel, and its opposing flange face material 2
Reinforcing bar insertion holes b having a slightly larger diameter than the threaded reinforcing bars 1 are bored at predetermined positions of a and 2a.

Reference numerals 3 and 3 indicate fixing fittings screwed onto the threaded reinforcing bars 1, and when the threaded reinforcing bars 1 are horizontally passed through the holes b of the facing surfaces 2a and 2a, the fixing fittings 3 and 3 are screwed together. The threaded reinforcing bars 1 are fixed to the longitudinal aggregate 2 by tightening the opposing facing members 2a, 2a from both outsides thereof.

If concrete 4 is poured after the above fixation,
In the conventional method, the column A' and the beam B' shown in FIG.
The annular reinforcing bar 5 is externally fitted onto the screw plug reinforcing bar 1 between the facing facing members 2a, 2a in such a manner that both ends thereof are in close contact with the inner surfaces of the facing facing members 2a, 2a. The method is the same as the one shown in Fig. 1 because the method is simply to position the reinforcing bars 5 on both sides of the longitudinal aggregate 2, and the difference is that the annular reinforcing bars 5 are placed. Knotted reinforcing bar 1
This can be done by a simple operation such as fitting it on the outside when penetrating the opposing face materials 2a, 2a, or fitting it on the threaded reinforcing bar 1 while rotating the annular reinforcing bar 5 after passing through. Although the construction method is no different from that shown in Figure 1, at the joint between the concrete column A and the beam B constructed there, a circular reinforcing bar 5 is installed around the threaded reinforcing bar 1 between the facing facing members 2a, 2a. Because of the location of threaded reinforcing bar 1
Even if a tensile stress is applied to the concrete 4 and a stress of diameter expansion is applied to the concrete 4 by the cam action of the screw node a,
The annular reinforcing bar 5 resists this with a strong concrete binding force, and the anchoring strength of the threaded reinforcing bar 1 to the concrete 4 can be dramatically increased.

Note that the annular reinforcing bar 5 is suspended and fixed by a wire (not shown) or the like so that the annular center of the annular reinforcing bar 5 and the axis of the threaded reinforcing bar 1 almost coincide, but the central part of the annular reinforcing bar 5 It is possible to make changes such as attaching hooks in series and suspending it, and it is also possible to change it to circular reinforcing bars 5 and welding multiple reinforcing bars to bar-shaped reinforcing bars, etc. In this case, , it is necessary to externally fit the threaded reinforcing bars 1 through the opposing face members 2a, 2a.

Figures 6 and 7 show longitudinal aggregates 2 with different shapes.
This figure shows a column-beam joint using . The one in Figure 6 is H
The shaped steel is used as the aggregate main body 2b, and the opposing face material 2 of this is used as the aggregate main body 2b.
A longitudinal aggregate 2 is obtained by welding facing materials 2c, 2c wider than the facing materials 2a to the outer surfaces of the facing materials 2a, 2a, and threaded reinforcing bars 1 are installed on both sides of the facing materials 2c, 2c. It has been penetrated.

In the case shown in Fig. 7, a plurality of reinforcing bars assembled in a basket shape is used as the aggregate main body 2b, and a face material 2d made of square steel strips is fitted onto the aggregate to form a longitudinal aggregate 2. It is something.

As explained above, the method of fixing the main beam reinforcement in the column-beam joint of the present invention is to use threaded reinforcing bars as the beam main reinforcement, and to horizontally attach them to the opposing face members of the longitudinal aggregate embedded in the concrete column. The opposing surface material is tightened from both outside sides by two fixing metal fittings screwed onto the threaded reinforcing bars, and annular reinforcing bars are externally fitted to the threaded reinforcing bars between the opposing surface materials. The anchoring strength of the threaded reinforcing bars to the concrete between the opposing facing materials can be increased by simply adding the external placement of circular reinforcing bars to the method shown in Figure 1, which has excellent workability. Overall, we have created a column-beam joint structure that has a fixing strength comparable to that of the method shown in Figure 3, in which each of the face materials is clamped using fixing metal fittings, and is extremely easy to construct. It was now available in good condition.

[Brief explanation of the drawing]

1 and 3 are side views showing a joint between columns and beams according to the conventional method, and FIG. 2 is an enlarged view of the main part of FIG. 1. Figure 4 and subsequent figures relate to the present invention;
The figure is a side view of the column-beam joint, and FIG. 5 is a cross-sectional view of the same. 6 and 7 are cross-sectional views of different embodiments, respectively. 1... Threaded joint reinforcement, 2... Longitudinal aggregate, 2a...
Face material, 3... Fixture fitting, 5... Circular reinforcing bar, A...
Concrete column, B...beam.

Claims (1)

[Claims] 1 Threaded reinforcing bars are used as beam main reinforcements, and this is passed through horizontally to opposing face members of longitudinal aggregate buried in concrete columns, and two anchors are screwed to these threaded reinforcing bars. A method for fixing main beam reinforcement at a beam-column joint, comprising: tightening the facing facing material from both outside sides with metal fittings, and externally arranging circular reinforcing bars on the threaded reinforcing bars between the facing facing facing materials.