Extended anti-stripping prestressed hollow grouting anchor rod and its supporting method

Abstract

The invention discloses an extended anti-stripping prestressed hollow grouting anchor rod and its supporting method, which comprises an anchor head and an anchor rod body. Block expansion shell clips, wedge-shaped grooves and T-line grooves are symmetrically arranged on the wedge head in the expansion shell, and wedge-shaped wings and T-line wings respectively matched with wedge-shaped grooves and T-line grooves are arranged on the expansion shell clips , a grout stopper, a backing plate, a spherical nut and a prestressing device are sequentially arranged at the end of the anchor rod body. The present invention can effectively prevent the occurrence of the phenomenon that the expansion shell clip is pulled away from the anchor rod and falls off from the inner wedge head of the expansion shell when the pretightening force is applied; the present invention installs one or more The fixer for fixing the position of the anchor body and the anchor hole can overcome the problem that the super-long anchor rod is not easy to be centered; the present invention applies prestress by mechanical means, effectively overcoming the defects in the prior art of simply relying on manpower to apply prestress.

Description

technical field [0001] The invention relates to a lengthening anti-slip prestressed hollow grouting anchor rod and a supporting method thereof. Background technique [0002] With the rapid development of my country's transportation construction, more and more new tunnels need to pass through complex geology, and the demand for prestressed anchor rods for tunnel support is also increasing. However, in the actual use of anchor rods, there are the following three problems: [0003] (1) The expansion clips of the anchor head on the market do not have a limit device in the expansion direction of the anchor head, which makes it easier for the expansion clips to slip out of the T-shaped slot in harsh working environments. For example, for the bolts stored in the bolt warehouse of the bolt trolley, due to the large vibration of the trolley when it is working, the expansion shell clips will slide out along the T-shaped groove; The performance of the rock is poor. When the prestress...

AI Technical Summary

Problems solved by technology

The grout stopper is made of rubber, which is relatively soft, and the centering effect of the anchor rod is not good; at the same time, because the outer diameter of the anchor rod body is smaller than the diameter of the anchor hole, the length of the anchor rod body is long and the deflection is large, the distance between the middle section of the anchor rod body and the anchor hole The connection is not stable enough, resulting in extremely uneven grouting layer wrapped around the anchor body after grouting, poor grouting quality, poor anchoring effect, and the thinner grouting layer has poor anti-corrosion effect on the anchor body

[0005] (3) Since the prestressed anchor rod needs to be prestressed during installation, the simple manual prestressing has the disadvantages of low efficiency, poor effect, time-consuming and laborious, etc.

[0006] These problems have directly affected the quality and efficiency of tunnel bolt support, and further affected the project quality and construction progress.

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