JPH0524732Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> This invention relates to a lap joint of main reinforcement, and more specifically to a lap joint of main reinforcement using spiral reinforcing bars.

<<Prior Art>> Lap joints are used as one method of joining main reinforcing bars when constructing reinforced concrete columns and beams. A lap joint is a method in which the main reinforcing bars that are joined are partially overlapped, and stress is transmitted to each other's main reinforcing bars by the adhesive strength of the concrete placed in the overlapped area.

However, simply by partially overlapping the main reinforcing bars and placing concrete in the overlapping area, stress cannot be smoothly transmitted to each other's main reinforcing bars at the overlap joint, and stress is concentrated on the concrete around the outer periphery of the overlap joint. Since this part is often damaged, spiral reinforcing bars are often placed around the outer periphery of the lap joint. As a result, the concrete poured around the outer periphery of the lap joint can be attached to the spiral reinforcing bars, and stress concentrated in the concrete around the outer periphery of the lap joint can be diffused.

Conventionally, as a method for placing spiral reinforcing bars around the outer periphery of overlap joints, when circular spiral reinforcing bars are placed around the outer periphery of overlap joints of main reinforcement, oval spiral reinforcing bars are placed around the outer periphery of overlap joints of main reinforcement. There have been cases (eg, Japanese Patent Publication No. 53-2254).

FIG. 3 shows a case where circular spiral reinforcing bars are arranged around the outer periphery of the overlapped joint of the main reinforcing bars, and the circular spiral reinforcing bars 4 are fitted around the outer periphery of the overlapped joint of the main reinforcing bars 2a and 2b to be overlapped.

Figure 4 shows the case where oval spiral reinforcing bars are arranged around the outer periphery of the overlapped joint of the main reinforcements, and the direction in which the main reinforcements 2a, 2b are overlapped is shown on the outer periphery of the overlapped joint of the main reinforcements 2a, 2b. An elliptical spiral reinforcing bar 6 having a long axis is fitted onto the outside.

<<Problems to be solved by the invention>> However, when circular spiral reinforcing bars are arranged around the outer periphery of the lap joint, as shown in FIG. 8 is large, that is, the width in the direction perpendicular to the main reinforcement overlap direction occupied by the circular spiral reinforcing bars 4 is large, and it interferes with and becomes a hindrance when building other main reinforcements, hoop reinforcements, stirrup and other auxiliary reinforcements, etc. Alternatively, if the blank area 8 is on the surface side of the concrete placed around the reinforcing bars, it is necessary to increase the concrete thickness by the amount of the blank area 8 in order to ensure the concrete cover thickness.

In addition, when elliptical spiral reinforcing bars are placed around the outer periphery of the lap joint, the problems that occur when arranging circular spiral reinforcing bars do not occur, but it is difficult to fabricate elliptical spiral reinforcing bars. There was a problem.

This idea was made in view of these problems, and its purpose is to use spiral reinforcing bars that can be easily manufactured, and to reduce the width of the spiral reinforcing bars in the direction perpendicular to the direction in which the main bars overlap. To provide an overlapping joint part of main reinforcement which can be narrow.

<<Means for solving the problem>> In order to achieve the above object, the overlap joint of the main reinforcement according to the present invention is made by partially overlapping two circular spiral reinforcing bars and inserting a support reinforcing bar into the overlapped part, A main reinforcing bar was inserted into each of the circular spiral reinforcing bars.

《Operation》 Since the splice reinforcing bars are inserted into the overlapping part of the circular spiral reinforcing bars, the integrity of the two circular spiral reinforcing bars is improved, and the overlap joint between the main bars inserted into each circular spiral reinforcing bar to be overlapped is improved. It is possible to prevent deformation.

<<Embodiment>> FIG. 1 is an explanatory diagram showing an embodiment of the present invention, and the configuration of the present invention will be explained below based on FIG. 1.

Reference numerals 2a and 2b are a pair of main reinforcing bars that are overlapped and spliced, and their respective ends are overlapped by a predetermined length in the lateral direction. At the end of each pair of main reinforcing bars 2a, 2b, there is a circular spiral reinforcing bar 20a, which has a length corresponding to the overlapping length of the main reinforcing bars 2a, 2b, and has a diameter larger than the diameter of the main reinforcing bars 2a, 2b. , 20b are fitted on the outside. The respective circular spiral reinforcing bars 20a, 20b partially overlap each other in the lateral direction. In the overlapping part of the circular spiral reinforcing bars 20a, 20b, a splint reinforcing bar 22, which has a smaller diameter than the main reinforcing bars 2a, 2b and is slightly longer than the overlapping length of the main reinforcing bars 2a, 2b, is inserted over the entire length of the overlapping part. There is.

This embodiment has the above-mentioned configuration, and the reinforcement reinforcement 22
By inserting the reinforcing bars 20a, 20b into the overlapping part of the circular spiral reinforcing bars 20a, 20b, the integrity of the two circular spiral reinforcing bars 20a, 20b is improved, and the shape of the reinforcing bars 2a, 2b that are overlapped is prevented from deforming at the overlapped part. can do.

When concrete is poured into the lap joints of the main reinforcements according to this embodiment having the above configuration, the main reinforcements 2a, 2
b. Concrete adheres around the circular spiral reinforcing bars 20a, 20b and splice reinforcing bars 22, and stress concentration occurs in the concrete around the lap joint, compared to a lap joint where the main reinforcements 2a, 2b are only partially overlapped. can be alleviated.

In this embodiment, circular spiral reinforcing bars 20a, 2
The length of 0b was set to correspond to the overlapping length of the main reinforcing bars 2a and 2b, and the support reinforcing bar 22, which was slightly longer than that length, was inserted through the overlapping part of the circular spiral reinforcing bars 20a and 20b over its entire length. The length of the spiral reinforcing bars 20a, 20b is the main reinforcing bars 2a, 2
It is not limited to the overlapping length of main reinforcing bars 2a and 2b, but may be longer or shorter than that, for example, it should be sufficiently shorter than the overlapping length of main reinforcing bars 2a and 2b, and as shown in FIG. Fitting circular spiral reinforcing bars onto the main reinforcing bars 2a and 2b, partially overlapping those circular spiral reinforcing bars in the lateral direction, and simultaneously inserting one splicing reinforcing bar into the overlapping part of the two sets of left and right circular spiral reinforcing bars; Furthermore, it is also possible to insert separate reinforcement reinforcing bars into the overlapping portions of the two sets of left and right circular spiral reinforcing bars.

In addition, two circular spiral reinforcing bars 20a, 20
b may have different diameters, and the length of the overlapping portion of the circular spiral reinforcing bars 20a, 20b in the overlapping direction of the main reinforcing bars 2a, 2b is the length of the reinforcing bar 22.
A gap may be formed in the overlapping direction between the support reinforcing bars 22 and the circular spiral reinforcing bars 20a, 20b, which have a diameter larger than the diameter of .

《Effects of the invention》 In this invention, two circular spiral reinforcing bars partially overlap, a support reinforcing bar is inserted in the overlapped part, and a main reinforcing bar is inserted into each circular spiral reinforcing bar.
Spiral reinforcing bars are circular and can be easily produced, and the width of the circular spiral reinforcing bars in the direction perpendicular to the direction of overlapping the main bars is larger than that when the main bars are overlapped in one circular spiral reinforcing bar.
It's narrow and you can get away with it.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention, in which figure a is a front view, figure b is a side view, and figure 2 is a front view showing another embodiment of the present invention. Figure 3 is an explanatory diagram showing a conventional example, and figure a is a front view;
4B is a side view, FIG. 4 is an explanatory diagram showing another conventional example, FIG. 4A is a front view, and FIG. 4B is a side view. 2a, 2b...Main reinforcement, 20a, 20b...Circular spiral reinforcing bar, 22...Support reinforcing bar.

Claims (1)

[Scope of utility model registration request] A lap joint of main reinforcing bars, characterized in that two circular spiral reinforcing bars partially overlap, a support reinforcing bar is inserted into the overlapping part, and a main reinforcing bar is inserted into each of the circular spiral reinforcing bars.