A pipe jacking construction method with close-distance mud-water balance in sand ginger clay stratum
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A construction method and mud-water balance technology, which can be used in earth-moving drilling, mining equipment, tunnels, etc.
Active Publication Date: 2021-07-06
ANHUI UNIVERSITY OF ARCHITECTURE +1
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[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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Embodiment 1
[0073] As shown in the figure, the present invention provides a construction method for near-distance mud-water balance pipe jacking in sand ginger clay stratum, and the construction method includes the following steps:
[0074] S1, Axis stakeout: Perform axis measurement and stakeout and retest the axis of the pipe jacking. The axis after the retest is qualified is used as the basis for the direction control of the pipe jacking. After qualified, proceed to the next step.
[0075] S2, installation of working well equipment: install the pipe jacking equipment in the well according to the axis measured and placed in step S1. The specific implementation is mainly divided into the following steps: the specific operation method of step S2 is:
[0076] S201, the installation of ground equipment, mainly the masonry of the on-site mud pool, the installation of mud-water separation equipment, the installation of slurry mixing equipment, the installation of hoisting equipment, the insta...
Embodiment 2
[0133] In this embodiment, taking the water source of Luoma Lake in Xuzhou City and the 06 bid section of the second surface water plant project as an example, the construction method of the present invention is used for construction. The water intake scale and the water delivery pipeline transportation scale are both 800,000 m 3 / d, the design uses double-row D2020 steel pipes. Among them, the section crossing the Xuhong River has a total length of 592m, and the buried depth of the pipeline is 4m to 17m. The pipeline is located in the sandy ginger clay layer, and the design adopts the pipe jacking construction technology. This section of pipe jacking has the characteristics of long jacking distance, complex geology, difficult jacking force control, and tight construction schedule, making construction difficult.
[0134] This soil layer is sand-containing ginger clay layer, and its main component is clay, but because it contains ginger stones, it has the characteristics of hig...
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Abstract
The present invention provides a construction method for near-distance mud-water balance pipe jacking in sandy ginger clay stratum. The main operation steps of the present invention are to stake out the axis first, then install pipe jacking equipment in the well on the staked axis, prepare and inject thixotropic mud, and finally carry out The jacking of the pipeline, in the process of jacking the pipeline, the present invention adopts the double-row short-distance pipe jacking mud-water balance construction method to jack the pipeline. The double-row pipelines are respectively the left-line pipeline and the right-line pipeline, and the right-line pipeline is pushed When the left-line pipeline is installed and welded simultaneously, when the left-line pipeline is pushed forward, the right-line pipeline is installed and welded simultaneously. The present invention adopts the alternate construction method of short-distance double-row pipe jacking to construct the geology of sandy ginger clay, which not only overcomes the characteristics of high viscosity and large friction coefficient of sandy ginger clay, but also reduces the number of double-row pipes. Interaction between pipelines during construction.
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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