Internal-expansion-type retaining device, system and method for receding of jacking pipe

Abstract

The invention discloses an internal-expansion-type retaining device for receding of a jacking pipe. The internal-expansion-type retaining device comprises connecting plates and a plurality of supporting hydraulic cylinders; the connecting plates are located in the jacking pipe, and the surfaces of the connecting plates are roughly perpendicular to the axis of the jacking pipe; one ends of the supporting hydraulic cylinders are hinged to the connecting plates, and the other ends of the supporting hydraulic cylinders are selectively supported on the inner wall of the jacking pipe; and the multiple supporting hydraulic cylinders are roughly symmetrical. The retaining device provides reverse retaining thrust through friction force of the retaining device and the inner wall of the pipeline, and thrust exerted by a main jacking hydraulic cylinder can be effectively controlled.

Description

technical field [0001] The invention belongs to the field of underground pipeline construction equipment, and in particular relates to an internal expansion type pipe jacking and pipe withdrawal stop device, system and method. Background technique [0002] When using the pipe jacking method to construct underground pipelines, if you encounter extremely serious external problems, such as serious damage to the pipeline, obstacles that cannot be removed at the front end of the pipeline, which make it impossible to continue jacking, etc., you need to use the pipe withdrawal method to remove The pipe is pulled out from the jacking hole, that is, the pipe is withdrawn. [0003] During the pipe withdrawal process, a steel seal door is installed at the front end of the pipe. Under the pulling force of the steel strand, the steel seal door can exert a force on the pipe toward the hole, driving the pipe joint to exit the hole. Depend on figure 1 It can be seen that there is the foll...

AI Technical Summary

Problems solved by technology

However, this method has two defects. One is that the jacking force of the main jacking hydraulic cylinder is not easy to control. Once the jacking force is too large, it will push back the pipeline. Second, it is impossible to always apply reverse thrust to the pipeline. After exiting, it needs to be transported out of the work site with a spreader, but at this time, the main top hydraulic cylinder needs to be retracted to make enough space for hoisting the pipe joint out, but once the main top hydraulic cylinder is retracted, The pipeline system that loses the reverse thrust is very likely to cause engineering quality or safety accidents

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