JPS59122656A - Connection of clustered iron wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] This invention relates to a method for joining spring reinforcing bars.

In general, the reinforcing bars of reinforced concrete structures are arranged one by one at predetermined intervals in order to sufficiently spread the concrete around the reinforcing bars. However, when arranging a large number of axial reinforcing bars in a limited cross section, the specified minimum spacing between reinforcing bars may not provide good concrete coverage, and in such cases, some reinforcing bars may be tied up. The reinforcement is arranged as a spring reinforcing bar, and the spacing between the spring reinforcing bars is increased to improve concrete rolling.

Conventionally, when joining spring reinforcing bars as mentioned above,
Because there are no gaps between the reinforcing bars that make up the spring reinforcing bars, gas pressure welding machines cannot be inserted, so lap joints are used. In the case of this lap joint, in order to transmit the stress of one spring reinforcing bar to the other spring reinforcing bar, the reinforcing bars must be overlapped for a predetermined effective overlap length determined by the adhesion between the reinforcing bar and the concrete. Therefore, there was a drawback that a large amount of reinforcing bars were used.

The purpose of this invention is to eliminate the above-mentioned conventional drawbacks, to provide a method for joining spring reinforcing bars that requires less reinforcing bars, does not require special skills, and can be joined reliably. It is said that

The first method of the invention is to overlap the ends of one spring reinforcing bar with the ends of the other spring reinforcing bar, fit a tube around this overlapped end, and then close both ends of the tube. The method is characterized in that a non-shrinking high-strength material is then injected into the pipe and hardened, and since the adhesive force between the non-shrinking high-strength material and the reinforcing bars is large, the effective overlap of the spring reinforcing bars is The length can be shortened and the amount of reinforcing bars used can be reduced.

The second method of this invention is to overlap the end of one spring reinforcing bar with the end of the other spring reinforcing bar, fit a coil spring around this overlapped end, and then fit a tube around the overlapped end. The method is characterized in that the pipe is fitted, the pipe is closed, and then a non-shrinkable high-strength material is injected into the pipe and hardened, and the coil spring restrains the non-shrinkable high-strength material by its tension. Therefore, when cracking occurs in non-shrinkable high-strength materials due to the stress of the reinforcing bars, the adhesion force increases.
The overlap length of the spring reinforcing bars can be further shortened.

The present invention will be described below with reference to embodiments shown in the drawings.

As shown in Figures 1 to 3, the spring reinforcing bars 1 to be joined
, 2 are made of two reinforcing bars 1a, lb and 2a, 2b in this example, and a coil spring 3 is fitted in advance around either one of the spring reinforcing bars 1, 2, and a steel pipe 4 is further fitted around it. Insert it. Spring reinforcing bars 1, 2
The reinforcing bars 1a, lb and 2g, 2b that constitute them are arranged in opposite directions when viewed in cross section,
Reinforcing bars 1a, lb and 2a when joining.

2b are overlapped by a predetermined length L so that they intersect with each other, and a coil spring 3 and a steel pipe 4 are fitted to the overlapping ends.

Then, both ends of the steel pipe are closed with iron lids 5 that have been inserted in advance through the spring reinforcing bars 1 and 2, and wedges 6 and 6 are inserted into the steel pipe 4 through holes that have been drilled in advance in a cross shape. Driving reinforcing bars 1a, Ib and 2a, 2b are bent into a barrel shape. Note that both ends of the tube may be closed using a cloth or a plastic lid.

Next, a non-shrinkable high-strength material is injected into the steel pipe 4 through the injection port 8 provided in the steel pipe 4, and after confirming that the injection material overflows from the air vent port 9, it is cured for a certain period of time to harden. Complete.

Non-shrinkage high-strength materials include cement-based or epoxy-based materials, such as MasterFollow manufactured by Chunichi-Kan Masters.

According to the above joining method, the stress of the spring reinforcing bars 1 and 2 is transmitted from one side to the other due to the adhesive force between the non-shrinkable high-strength material and the reinforcing bars la, lb, 2a, 2b, but this adhesive force The adhesive force between the concrete and the reinforcing bars is also large, and the overlap length L can be shortened. The coil spring 3 restrains the non-shrinkable high-strength material by its tension, and prevents splitting of the non-shrinkable high-strength material due to the stress of the spring reinforcing bars 1 and 2, thereby increasing the adhesion force. be able to. Therefore, by installing the coil spring 3, the overlap length can be further shortened <-tX, and the horizontal 6 prevents the spring reinforcing bars 1 and 2 from shifting, thereby ensuring reliable stress transmission. Furthermore, the steel pipe 4 serves as a formwork made of non-shrinkable high-strength material, and also serves as an auxiliary function for transmitting stress and stabilizing adhesion.

Other embodiments are shown in FIGS. 5 to 8, and FIGS. 5 and 6 show Example 1 in which the spring reinforcing bars 1.2 are each composed of three reinforcing bars 1a to 1c and 2a to 2C, and FIGS. Figure 8 shows spring reinforcing bars 1.2 and 4 reinforcing bars Ja-Jd and 2, respectively.
An example consisting of a to 2d is shown. Note that the iron lid 5, wedge 6, etc. are omitted in the illustration.

This invention is as described above, and since the spring reinforcing bars are joined by a non-shrinking high-strength material, the overlap length can be shortened due to the strong adhesion between the reinforcing bars and the non-shrinking high-strength material. , so less reinforcing steel is required.

The work can be completed within a short time by following the temporary assembly work without any special skills required, and it is not affected by weather etc., and the work itself is extremely safe, and there is no vibration, noise, There is no problem in terms of fire and other pollution, and it is extremely effective especially when applied to joining reinforcing bars such as columns and beams where many reinforcing bars are in close contact. As for the materials, ordinary commercially available products can be used, and there is almost no special order required, making it extremely advantageous from a cost standpoint.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing one embodiment of the present invention, Fig. 2 is a sectional view taken along the line -H in Fig. 1, and Fig.
A cross-sectional view taken along the line n1llll in the figure, Figure 4 is the 1st
Fig. 5 is a longitudinal sectional view showing an example in which three reinforcing bars are tied together, and Fig. 6 is a cross-sectional view taken along line IV-IV in Fig. 5. FIG. 7 is a vertical cross-sectional view showing an embodiment in which four reinforcing bars are tied together, and FIG. 8 is a cross-sectional view taken along the line 1--2 in FIG. 7. 1.2... Spring reinforcing bars 1a~ld, 2a~2d・
・・Reinforcement bar 3・・Coil spring 4・・Steel pipe 5・
... Iron lid 6... Patent Dejima person Tekken Construction Co., Ltd. 5 diagrams 7 engrases 6 d Hi 8 diagrams do c +a za

Claims (1)

[Claims] 1. The end of one spring reinforcing bar is overlapped with the end of the other spring reinforcing bar, a pipe is fitted around this overlapped end, and both ends of the pipe are closed. , a method for joining spring reinforcing bars, which is characterized by injecting a non-shrinking high-strength material into the pipe and then curing it. 2. Overlap the end of one spring reinforcing bar and the end of the other spring reinforcing bar, fit a coil cylinder around this overlapped end, fit a tube around it, and then A method for joining spring reinforcing bars, which is characterized by closing both ends of the tube, and then injecting a non-shrinking high-strength material into the tube and hardening it.