Injecting and mounting method of stretching anchor rod

Abstract

The invention discloses a grouting method for a stretch-draw anchor rod, wherein a fast-setting anchoring agent and a slow-setting anchoring agent are grouted into an anchor rod hole respectively by adoption of an extruding grouter by means of fast setting first and slow setting subsequently; a grout pipe is extruded by grouting pressure and smoothly withdrawn until the anchor rod hole is filled with serum; and stretch-draw locking of the anchor rod is performed before initial setting of the slow-setting anchoring agent and after final setting of the fast-setting anchoring agent when the anchor rod is arranged in place and the strength required is reached. The grouting is uniform and continuous, the grout pipe is slowly extruded by the serum and is not influenced by artificial influence, so that no gap can occur and the compactness can be fully guaranteed; grouting equipment only needs power supply, so that a complex blast pipe line is saved; and the grouting method has the advantages of simple and convenient technology, high construction efficiency and good application prospect, and safety and reliability.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and in particular relates to a method for injecting tension bolts used for working face support. Background technique [0002] In the support of tunnel excavation, it is often necessary to use tension anchors. The traditional tensioning anchor injection method is to transport the soaked quick-setting cement rolls and slow-setting cement rolls into the anchor holes one by one with an air pressure gun pump, and then install the anchors on a shelf or other climbing equipment. The defects of this construction technique are as follows: First, since the cement medicine rolls are conveyed in segments one by one, with an interval of 1 to 2 seconds in between, it cannot be guaranteed that the medicine rolls are close to each other. It is very easy to form a void inside, which seriously affects the strength of the tensioned anchor; secondly, due to the complex air supply system pipeline i...

AI Technical Summary

Problems solved by technology

The defects of this construction technique are as follows: First, since the cement medicine rolls are conveyed in segments one by one, with an interval of 1 to 2 seconds in between, it cannot be guaranteed that the medicine rolls are close to each other. It is very easy to form a void inside, which seriously affects the strength of the tensioned anchor; secondly, due to the complex air supply system pipeline in the cavern and a large number of air equipment, the stability of the wind pressure for the tensioned anchor cannot be guaranteed. If it is too low, the cement rolls cannot be compacted, and the bonding force between the rolls is not enough, and it may even fall due to its own weight; if the wind pressure is too large, the strong impact will make the cement rolls rebound out of the orifice, wasting materials; the third , the pump nozzle of the air pressure gun is small. Due to the short hardening time of the cement roll, it is easy to block the pipe, and the slurry is easy to spray out when cleaning the pipeline, which will injure the construction personnel and pose a safety hazard; fourth, the personnel who pull in the slurry pipe are familiar with The degree is uneven, easy to pull out, and gaps appear; fifth, the work efficiency is low. It takes at least 40 minutes to complete the injection of a 6m-long tension anchor, which seriously affects the construction progress of the project.

How to overcome the above defects has become a technical problem to be solved urgently in the prior art, but there is no good solution as yet

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