Secondary high-pressure grouting expansion bit anchor rod and construction method thereof

Abstract

The invention discloses a secondary high-pressure grouting expansion bit anchor rod and a construction method of the secondary high-pressure grouting expansion bit anchor rod and belongs to a novel anchoring structure. The secondary high-pressure grouting expansion bit anchor rod comprises an anchor rod body, grouting bags and grouting pipes. The secondary high-pressure grouting expansion bit anchor rod is characterized in that a centering grouting bag is arranged on the front segment of the anchor rod body, a secondary grouting bag is arranged on the rear segment of the anchor rod body, a primary grouting pipe and a secondary grouting pipe are arranged on the anchor rod body, an outlet of the primary grouting pipe is located at the foremost end of the portion, located in the centering grouting bag, of the anchor rod body, and an outlet of the secondary grouting pipe is located at the front end in the secondary grouting bag. The construction method of the secondary high-pressure grouting expansion bit anchor rod comprises the steps of pore forming, rod body placement, grouting of the centering grouting bag, secondary grouting and tensioning for locking. The secondary high-pressure grouting expansion bit anchor rod and the construction method of the secondary high-pressure grouting expansion bit anchor rod have the advantages that after primary grouting and solidification, secondary high pressure is adopted for grouting the secondary grouting bag, and cemented soil on the rear segment of an expansion bit is squeezed closely or cracked by means of high-pressure grouting, so that an anchoring body applies precompression to a soil body, the frictional resistance between the anchoring body and the soil body is enhanced, and consequently the pulling resistance of the anchor rod is increased.

Description

technical field [0001] The invention discloses a secondary high-pressure grouting expansion head anchor rod and a construction method, which belong to a novel anchor structure and its construction method. The anchoring structure widely relates to the fields of foundation pit support, side slope support and foundation anti-floating engineering of construction engineering. Background technique [0002] The existing anchor rods used in underground engineering and slope reinforcement projects mainly rely on the cohesive force and friction force between the anchorage section and the surrounding soil to transmit loads, and belong to frictional anchor rods. Its disadvantages are: 1. The size of the anchoring force depends on the length of the anchoring section and the nature of the soil in contact with the anchoring section. If it encounters special soft soil, the reinforcement effect will not be good; 2. Ordinary high-pressure jet expansion head The anchor has the problems of low...

AI Technical Summary

Problems solved by technology

The disadvantages are: 1. The anchoring force depends on factors such as the length of the anchoring section and the nature of the soil in contact with the anchoring section. If it encounters a special soft soil, the reinforcement effect will not be good; 2. Ordinary high-pressure jet expansion head The anchor has the problem of low cement-soil strength and poor grip between the anchor and the rod; 3. The Xiang-type anchor has poor grip between the anchor and the surrounding soil, and the compressed end is not compact

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