Construction method for pipe retreating of cross-river pipe jacking pipeline in soft soil stratum

Abstract

The invention discloses a construction method for pipe retreating of a cross-river pipe jacking pipeline in a soft soil stratum. The method comprises the following steps that firstly, original equipment devices in a pipe retreating pipeline are dismounted and removed, a steel seal door, a reverse jacking hydraulic cylinder, a counter pull steel beam, a steel strand set and other pipe retreating equipment devices are installed, safety measures of the steel seal door, the reverse jacking hydraulic cylinder, the counter pull steel beam, the steel strand set and other pipe retreating equipment devices are checked, and pipe retreating construction is conducted after debugging. In the method, measures of arrangement of a dewatering well and a packing water stop ring are adopted for solving the problem of water stop, and for solving the problem of collapse risks existing after pipe retreating, the manner that pipe retreating and soil filling are conducted at the same time is adopted; and meanwhile, in the later stage of pipe retreating, injected soil slurry is switched into cement slurry, and a hole is strengthened. According to the disclosed technical scheme, the collapse problem is effectively solved, and meanwhile long-distance pipe retreating is achieved.

Description

technical field [0001] The invention relates to the field of pipeline construction, in particular to a construction method for withdrawing pipes from cross-river pipe jacking pipes in soft ground. Background technique [0002] In the field of underground pipeline construction, the pipe jacking method is a common construction method. It uses machinery to excavate the soil in front, and the pipe joints at the rear are pushed forward under the push of hydraulic equipment, and the hydraulic equipment uses its powerful thrust to push the pipe joints into the formation. However, in some special cases, such as when an important underground structure is encountered during the jacking process of the pipeline, or when an extremely bad stratum is encountered, the pipeline can no longer be jacked. If the pipelines are not recycled, the abandoned pipelines may hinder the future construction of underground pipelines and may also cause secondary disasters. Therefore, it is necessary to r...

AI Technical Summary

Problems solved by technology

The reverse thrust required by the long-distance pipeline is very large, and the simple short-distance pipe withdrawal method cannot meet the requirements

At the same time, long-distance pipe withdrawal requires high pipe withdrawal speed and soil backfill technology, because once the pipe is withdrawn, the soil is not backfilled in time and fully, and the stratum will collapse due to stress loss on a large scale, resulting in an oversized surface Subsidence and other adverse consequences

Images