pre-anchor catheter

Abstract

The present invention relates to a pre-anchored conduit, which is an improvement to the existing pipe-slit anchor, comprising: a rod body, an expansion core, a backing plate, and a nut; the front half of the rod body is a tubular rod body with a longitudinal seam , the second half is a hollow bolt body made of seamless steel pipe and rolled into a fully threaded shape, which is connected into a whole by welding. The front end of the rod body is provided with an expansion core, and the rear end of the rod body is provided with a nut and a backing plate . The bolt can realize top fixing, significantly increase the anchoring force, and at the same time, the hollow bolt body can be used for grouting to the rock formation. In addition, the tail end uses a nut to replace the pull ring, which is more stable. The anchor rod has low production cost, can significantly improve the anchoring effect of the pipe-slit anchor rod, and has high economic benefits.

Description

technical field [0001] The invention relates to the field of geotechnical engineering support, in particular to a novel pre-anchor conduit, which is an improvement to the existing pipe-slit type anchor rod. Background technique [0002] Slotted anchors are known. The pipe slot bolt is a full-length anchor and actively reinforces the surrounding rock. It is mainly suitable for temporary support or permanent support of mine metallurgy, hydropower, railway and other shaft projects. Its three-dimensional part is made of high-strength metal plate rolled into a tubular rod body with longitudinal seams, and a pull ring is welded at the end, which is used together with the supporting plate. When it is installed in a hole slightly smaller than the diameter of the pipe, it can immediately exert radial pressure on the hole wall over the entire length and generate frictional force to prevent the surrounding rock from sliding down. Therefore, the surrounding rock is in a three-dimensio...

AI Technical Summary

Problems solved by technology

[0003] The main disadvantages of this known pipe-slit type bolt are: (1) the anchoring force is low, mainly showing that the anchoring force at the top is small, the ratio of the anchor rod to the borehole diameter does not match, and the installation is not in place, etc., (2 ) The pull ring welded at the tail end is easy to fall off during installation and use due to welding quality problems, resulting in accidents; (3) cannot be grouted, the rod body is easy to corrode, and cannot meet the requirements of permanent support

[0004] It can be seen that the above-mentioned existing slit type anchor rod obviously still has inconvenience and defects in structure and use, and needs to be further improved urgently.

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