Pre-stressed anchoring conduit

Abstract

The invention relates to a pre-stressed anchoring conduit based on improvement of an existing tube seam type anchor rod. The pre-stressed anchoring conduit comprises a rod body, an expanding core, a base plate and a nut, wherein the front half section of the rod body is a tubular rod body with a longitudinal joint, the rear half section of the rod body is a hollow anchor rod body in a full thread shape and made and rolled from a seamless steel tube, the tubular rod body and the hollow anchor rod body are welded into a whole, the expanding core is arranged at the front end of the conduit, and the nut and the base plate are arranged at the rear end of the conduit. According to the pre-stressed anchoring conduit, top anchoring can be achieved, anchoring force is obviously increased, and grouting to a rock stratum can be achieved through the hollow anchor rod body. Due to the fact that a pull ring is replaced with the nut at the tail end, stability is improved. The pre-stressed anchoring conduit is low in manufacturing cost, capable of greatly improving the anchoring effect of the tube seam type anchor rod, and quite high in economic benefit.

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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