Pipe-jacking construction method for mealy sand stratum

Abstract

The invention discloses a pipe-jacking construction method for a mealy sand stratum. The pipe-jacking construction method for the mealy sand stratum comprises the steps that firstly, a working well is constructed, specifically, the working well used for jacking a constructed underground pipeline is constructed, the constructed underground pipeline is formed by splicing a plurality of pipeline assembly sections from front to back, and a steel bushing head tool pipe comprises a steel sleeve, a supporting ring mounted on the inner side of the rear end of the steel sleeve, and an insertion opening fixed to the supporting ring; secondly, jacking equipment is mounted, specifically, the jacking equipment is mounted at the bottom of the inner side of the working well; thirdly, the steel bushing head tool pipe is jacked through the process that the steel bushing head tool pipe is hoisted in place, the steel bushing head tool pipe is jacked, and manual intra-pipe earth cutting is conducted; fourthly, the pipeline is jacked, specifically, the multiple pipeline assembly sections of the constructed underground pipeline are jacked from front to back; fifthly, a pipeline port is treated; and sixthly, a closed water test for the pipeline is conducted. According to the pipe-jacking construction method for the mealy sand stratum, the steps are simple, the design is reasonable, construction is easy and convenient, and the using effect is good; and a pipe-jacking construction process of the mealy sand stratum can be completed easily, conveniently and rapidly, and the construction process is safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of underground pipeline construction, and in particular relates to a construction method for pipe jacking in silty soil layer. Background technique [0002] The pipe jacking method refers to a kind of underground excavation construction method used when tunnels or underground pipelines cross various obstacles such as railways, roads, rivers or buildings. During construction, the pipe is pressed into the soil layer with the hydraulic jack supported on the back seat of the foundation pit through the force transmission jack iron and the guide rail, and the soil on the front of the pipe is excavated and transported away at the same time. After the first section of pipe is fully pushed into the soil layer, then the second section of pipe is connected to the back and continues to be jacked, so that the section of pipe is pushed in, the interface is made, and the culvert is built. Working wells are generally used ...

AI Technical Summary

Problems solved by technology

Since the sand layer where the depth of the pipe jacking position is located in the above project is the full-section silt layer with high water content and poor arching performance, it must be considered that the sand layer on the top of the pipe is completely pressed on the top of the pipe during jacking, resulting in positive pressure, The frictional resistance caused by the lateral pressure increases; at the same time, it is easy to appear "heading" and top line deviation during jacking of the saturated sand layer

In the process of adopting the traditional pipe jacking construction mode (i.e. manual hand digging pipe jacking construction), when a large amount of silt layer is encountered, it is easy to collapse and construction cannot be carried out. Therefore, it is necessary to improve the traditional pipe jacking construction method

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