A second high-pressure grouting expansion head bolt and its construction method

Abstract

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. It includes the anchor rod body, grouting bag and grouting pipe. The key technology is that the front part of the anchor rod body is provided with a centering grouting bag, the rear part of the anchor rod body is provided with a secondary grouting bag, and the anchor rod body is provided with a primary grouting bag. For the grouting pipe and the secondary grouting pipe, the outlet of the primary grouting pipe is located at the front end of the anchor rod body in the centering grouting bag, and the outlet of the secondary grouting pipe is located at the front end of the secondary grouting bag. The construction method of the second high-pressure grouting expansion head bolt includes hole making, rod body placement, centering grouting bag grouting, secondary grouting and tension locking. The beneficial effect of the present invention is: after the primary grouting is solidified, the secondary grouting bag is grouted by using the secondary high pressure, and the high pressure grouting will compact or crack the cement and soil in the back section of the expansion head, so that the anchoring body Preload is applied to enhance the frictional resistance between the anchor and the soil, thereby improving the pullout resistance of the anchor.

Description

Technical field [0001] A secondary high-pressure grouting enlarged head anchor rod and a construction method thereof belong to a new type of anchoring structure and its construction method. The anchoring structure is widely involved in the fields of foundation pit support, 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 adhesion and friction of the anchoring section and the surrounding soil to transfer loads, and belong to friction anchor rods. The disadvantages are: 1. 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 is not good; 2. The ordinary high-pressure jet expansion head The anchor rod has the problems of low cement-soil strength and poor binding force betw...

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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