Construction method for short-distance slurry balance pipe jacking of lime concretion clay stratum

Abstract

The invention provides a construction method for short-distance slurry balance pipe jacking of a lime concretion clay stratum. The method comprises the following main operation steps: firstly, carrying out axis lofting; then, mounting in-well pipe jacking equipment on the lofted axis; preparing and injecting thixotropic slurry; finally, jacking the pipeline. In the jacking process of the pipeline,the pipeline is jacked; a double-row short-distance pipe jacking slurry balance construction method is adopted to jack a pipeline; wherein the double rows of pipelines are respectively a left line pipeline and a right line pipeline, the left line pipeline is synchronously mounted and welded when the right line pipeline is propelled, the right line pipeline is synchronously mounted and welded whenthe left line pipeline is propelled, the left line pipeline and the right line pipeline are subjected to alternate construction, and the construction is finished after the left line pipeline and theright line pipeline enter holes. The geology containing the lime concretion clay is constructed by adopting a short-distance double-row pipe jacking alternate construction method, so that the characteristics of high viscosity and relatively high friction coefficient of the lime concretion clay are overcome, and the mutual influence between pipelines during double-row pipe construction is reduced.

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 with mud-water balance at a short distance in sand ginger clay strata. Background technique [0002] With the city's increasing demand for water supply, the construction of water sources and water pipelines has also been vigorously developed in recent years. However, there is no successful application example for short-distance double-row steel pipe jacking construction under sandy ginger clay geological conditions. Generally, during the construction of water pipelines, the construction area stratum is divided into five layers from top to bottom. The first layer: silt with silt; the second layer: silty clay with silt; The fourth layer: clay; the fifth layer: sandy ginger clay, and the formation where the double-row steel pipe jacking is located is the fifth sandy ginger clay layer. Sand ginger clay has...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the excessive disturbance between adjacent double-row pipes when the double-row pipe jacking pipes are constructed separately in the above-mentioned prior art, and the mutual influence load is relatively large, and at the same time, the construction efficiency of the sandy ginger clay layer is improved. Not high, technical problems with relatively difficult construction

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