Physical touch drag reduction method for pipe jacking mud

Abstract

The invention discloses a physical touch resistance reducing method of top pipe mud. The method is characterized in that thixotropic mud is prepared by mixing raw materials in parts by weight; a ratio of bentonite to carboxymethylcellulose to sodium carbonate to water is 8-10: 0.1-0.13: 0.8-0.9: 90; a concrete vibrating rod is anchored on the inner wall of a top pipe through a steel piece, and is attached to the pipe wall; and the prepared thixotropic mud is injected in a gap between the outer side surface of the top pipe and soil to form a mud sleeve. The physical touch resistance reducing method of the top pipe mud is convenient for use and low in production cost and adopts a physical vibrating method to activate thixotropy of the mud, and the problem of increment of jacking force caused by longer time of the mud standing between the pipe and the soil is solved. A thinking model of only researching a mud material and matching resistance reduction is broken through, and initial jacking force of the top pipe is largely reduced on the basis of reducing resistance by using the thixotropic mud.

Description

technical field [0001] The invention belongs to the technical field of drag reduction in pipe jacking construction, and relates to a physical touch drag reduction method for pipe jacking mud on the premise of using thixotropic mud. Background technique [0002] The pipe jacking construction method is a commonly used underground trenchless pipe laying technology. The friction between the pipe and the soil is relatively large, resulting in a large rear support force required by the working well, or even unable to provide support force, resulting in construction difficulties. At present, in the pipe jacking construction method, most of the methods to reduce the frictional resistance between the pipe and the soil lie in the thixotropic properties and proportion of the mud material, and have achieved certain results. However, the disadvantage of this type of method is that when thixotropic mud is used for drag reduction in pipe jacking construction, the jacking force after the mu...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this type of method is that when thixotropic mud is used for drag reduction in pipe jacking construction, the jacking force after the mud is left to stand is greatly increased due to the intermittent construction shutdown time, and a sufficiently large jacking force and subsequent The supporting force is to generate a certain displacement to promote the thixotropic drag reduction of the mud. If the displacement cannot be generated, the thixotropy cannot be generated, the friction force cannot be reduced, and the construction cannot continue

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