Drilling, spraying, injection integral enlarging anchor rod construction method

Abstract

The invention relates to an anchor rod construction method in a drilling, spraying and infusing integrated enlargement body; a single-pipe drilling, spraying and infusing aiguille equipped with a hydraulic controllable on-off auxiliary grouting hole and a long drillrig anchor rod driller which can implement the single-pipe high-speed spraying jet cutting technique are adopted to drill holes; when the drilled hole reaches a set depth, the aiguille is moved to a set position of an anchor root hole section; high-pressure clear water or grout is conveyed to the aiguille to produce a high-speed spraying jet cutting anchor hole sidewall and form an anchor root hole meeting the design need; after the operation of the anchor root hole enlargement is completed, the aiguille is lowered to the bottom of the anchor hole, then the aiguille is slowly retreated and the grout is continuously infused by the auxiliary grouting hole till the grouting of the anchor hole or the grouting replacement of the anchor hole is completed, then an anchorage cable body is lowered to the anchor hole with filled grouts to form the anchor rod of the enlargement body. The aim of the invention is to provide an anchor rod construction method in the drilling, spraying and infusing integrated enlargement body, which has high bearing capacity of the anchor rod, good durability, less construction equipment, simple technology, high efficiency, low cost and no pollution, and can carry out construction operation under the conditions of various stratums.

Description

technical field [0001] The invention relates to a construction method for setting anchor rods or anchor piles by using special machines and fluid high-speed jet flow technology specially used for foundation engineering and anchoring engineering. Background technique [0002] Various types of soil anchor technology are widely used in slopes, foundation pits, tunnels, underground pipelines and anti-floating projects in transportation, construction, municipal, hydropower, mine construction and other industries. So far, the anchoring body of most engineering anchors is cylindrical and has a small diameter, so that the improvement of the bearing capacity of the anchor under certain stratum conditions mainly depends on the anchorage length, and the improvement of the pull-out bearing capacity of the anchor in the soil layer is affected by restrict. In order to improve the bearing capacity of the soil anchor, the Chinese invention patent application number 94108778.6 discloses "th...

AI Technical Summary

Problems solved by technology

In this method, a drill pipe with a drill bit is used in the drilling process. After the drilling is completed, the drill bit needs to be withdrawn, and the high-pressure pipe with the spray head is replaced, and then put into the anchor hole for high-pressure rotary spraying and reaming. The construction process is complicated and time-consuming, and it is easy to collapse holes in the soil layer with poor self-stability

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