Method for paving large-diameter pipeline in soft soil in jacking and pulling combined manner

Abstract

The invention relates to a paving tool pipe for a large-diameter pipeline and relates to a method for paving a large-diameter pipeline in soft soil in a jacking and pulling combined manner. The method is characterized by comprising the following steps: a) manufacturing the tool pipe; b) selecting the size of a working pit jack and a horizontal directional driller; c) drilling a hole by using the horizontal directional driller; d) inserting the tool pipe into the hole; e) jacking, pulling and paving the pipeline; and f) taking the tool pipe out of the hole. The method provided by the inventionhas the advantages that the interaction of force is smartly utilized to cause the pipeline to extend forward so as to bring convenience for construction, the application scope is wide, the influence on traffic is small, the technical development is perfect, the use ratio is high, the structure and the principle are simple and practicable, the cost is saved, the developing prospect is wide and themethod is safe and reliable.

Description

[technical field] [0001] The invention mainly relates to a laying tool pipe of a large-diameter pipeline, in particular to a method for laying a large-diameter pipeline in soft soil by using top-drawing combination. [Background technique] [0002] In the prior art, the main methods for laying large-diameter pipelines in soft soil are excavation method and pipe jacking method, but it is difficult to construct large-diameter pipelines in soft soil by using excavation method and pipe jacking method, mainly as follows Several aspects: [0003] 1. Slope opening and pipe laying, because the internal friction angle of soft soil is usually small, the slope toe angle is small when grading, and the excavation volume is relatively large, especially for drainage pipes, whose inner diameter exceeds 1.2m. deep. Because the excavated soil usually does not meet the requirements of backfill, the backfill needs to be borrowed, and the construction cost is high. [0004] 2. Support slotted ...

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Problems solved by technology

Because the excavated soil usually does not meet the requirements of backfill, the backfill needs to be borrowed, and the construction cost is high

[0004] 2. Support slotted pipe laying. Due to the soft soil, the length of support piles that need to be driven into the bottom of the trench is large. Usually, the length below the base is greater than the depth of the trench. The need for support materials is large and the cost of construction machinery is high.

[0005] 3. For open and partially open pipe jacking, the direction of the soft soil is not easy to control, especially the concrete drainage pipe, which is heavy, and once there is a large deviation in the direction in the soft soil, it is difficult to correct the deviation

It takes a long time and high cost to lower the groundwater level in soft soil, and the pipe jacking below the groundwater level is prone to roof fall and ground collapse, and the construction personnel are at great risk

[0006] 4. For fully enclosed automatic pipe jacking, the equipment purchase cost is high at one time. Each set of equipment only corresponds to a certain diameter pipe, and the equipment utilization rate is not high.

[0007] Due to the above problems, it has caused a lot of inconvenience for the construction, the utilization rate is small, and there are also many potential safety hazards, which are not safe and reliable enough.

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