Detachable adaptive multi-stage resistance-increasing high-strength hollow grouting anchor pipe and its construction method

Abstract

The invention discloses a detachable adaptive multistage resistance increase high-strength hollow grouting anchorage tube and a construction method of the detachable adaptive multistage resistance increase high-strength hollow grouting anchorage tube. The detachable adaptive multistage resistance increase high-strength hollow grouting anchorage tube comprises arc-shaped tube sheets, wherein the corresponding tube sheets are connected in a surrounding mode to form an anchorage tube section of a tubular structure. Multiple anchorage tube sections are connected together through connecting clamps, and the anchorage tube sections are assembled. Expansion plugs connected in series through a connecting rod are arranged at the center of the tail of each anchorage tube section. Each tube sheet is provided with grout outlets. The tube sheets are of the same specification and can be machined and produced in batches, construction transportation is facilitated and the tube sheets are conveniently carried and installed by workers; when the external tube sheets are extruded along with surrounding rock, the tube sheets are made to unfold uniformly through the expansion plugs, and friction force between the tube sheets and the surrounding rock is enhanced; meanwhile, the surrounding rock is extruded, and the stress state of the surrounding rock is improved; high-pressure grouting is conducted at the tail of the anchorage tube, so that the surrounding rock is strengthened, binding power of the surrounding rock and the anchorage tube is improved, and latter deformation of the surrounding rock is better controlled.

Description

technical field [0001] The invention relates to a detachable self-adaptive multi-stage resistance-increasing high-strength hollow grouting anchor pipe and its construction method, in particular to a detachable freely assembled multi-stage resistance-increasing high A strength hollow grouting anchor pipe and its installation and use method. Background technique [0002] In order to maintain the rapid and healthy development of my country's economy, infrastructure construction is in full swing. In recent years, whether it is to increase the intensity of western development or to alleviate the pressure of urban traffic, urban subways are being built in full swing. Many underground transportation projects have to face the problem of supporting the surrounding rock after tunnel excavation; especially coal resources. In deep mining and in the ultra-long, deep-buried and high-in-situ stress traffic tunnels in western my country, the surrounding rock of this type of chamber is weak ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and provide a detachable self-adaptive multi-stage resistance-increasing high-strength hollow grouting anchor pipe, which can solve the problem that the traditional bolt size specification is relatively single during the excavation process of deep underground space. , and there are often problems such as being pulled out or breaking with the deformation of the surrounding rock, the grouted anchor pipe can realize the dynamic self-adaptive resistance increase and reinforcement of the bolt according to the deformation of the surrounding rock, providing an effective guarantee for the long-term stability of the chamber

Images