Construction Method of Prestressed Soil Anchor Rod with One-time High Pressure Rotary Spraying Type Expansion Head

Abstract

The invention provides a one-time high pressure jet grouting type expansion head prestress soil anchor rod construction method. The one-time high pressure jet grouting type expansion head prestress soil anchor rod construction method comprises the step of measuring and marking of an anchor rod hole, the step of construction of a construction work platform, the step of installation of a drilling machine, the step of manufacturing and installing of a prestress anchor rod, the step of hole drilling, the step of rotary jet grouting, the step of construction of an expansion head at the anchor end, the step of installation of a purlin and an anchor bearing plate, and the step of prestress tension and construction of the anchor rod. Compared with conventional grouting prestress anchor rod construction methods, through the application practices in multiple ultra-large irregular deep foundation pit engineering, the one-time high pressure jet grouting type expansion head prestress soil anchor rod construction method has the extremely good anchoring force and anti-pulling bearing force. By adoption of the one-time high pressure jet grouting type expansion head prestress soil anchor rod construction method, the extreme anti-pulling bearing force of the anchor rod can be greatly improved, and the manufacturing cost of the anchor rod for unit bearing force is reduced.

Description

technical field [0001] The invention relates to the construction technology of a grouting type prestressed soil anchor, in particular to a construction method of a one-time high-pressure rotary spraying type expanding head prestressed soil anchor. Background technique [0002] With the continuous development and utilization of urban underground space, deep foundation pit projects have become more and more common, especially the emergence of super large and super deep irregular foundation pit projects, which has brought great challenges to our design and construction. [0003] For irregular deep foundation pits, there are many restrictions on the application of reinforced concrete or steel support systems, while rock-soil bolt support technology can be flexibly applied without being affected by the shape and depth of foundation pits. The anchor (cable) technology will develop rapidly in the future, and the prestressed anchor (cable) support system will be widely used in the b...

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Problems solved by technology

[0004] The embodiment of the present invention provides a one-time high-pressure rotary spraying type expansion head prestressed soil anchor construction method to solve the hidden dangers buried in engineering construction in the prior art because the quality of the grouting body in the anchorage section cannot reach the expected effect , and even directly brought about the problem of risk accidents

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