Construction method for repairing leaky river-crossing pipeline by utilizing air pressure system

Abstract

The invention discloses a construction method for repairing a leaky river-crossing pipeline by utilizing an air pressure system. The construction method is characterized in that the construction method comprises the following steps that S1, water injection is conducted on a working well, so that the working well and the interior of the pipeline are filled with water; S2, a sealed air pressure cabin is established at the joint of the working well and the pipeline; S3, recharge water in the working well is pumped out, high-pressure gas is driven into the pipeline by utilizing the leakproofness of the sealed air pressure cabin, and meanwhile accumulated water in the pipeline is pumped out; and S4, high-pressure gas is utilized to balance a waterhead in a pressure-bearing water-soil layer, water in the pipeline is replaced, a no-water operating condition is created, and inspection, leaking stoppage, repairing and pipeline filling under the situation of dislocation are completed under the air pressure state. According to the construction method for repairing the leaky river-crossing pipeline by utilizing the air pressure system, the river-crossing leaky pipeline is effectively repaired, meanwhile the engineering quality after the pipeline is maintained is ensured, the construction risk is effectively reduced, and the safety of constructors is guaranteed.

Description

technical field [0001] The invention relates to the field of underground pipeline construction, in particular to a construction method for repairing a leaking cross-river pipeline by using an air pressure system. Background technique [0002] Most of the deep-buried pipelines are often located in the formation containing groundwater. Once the pipeline leaks, the groundwater and the sediment in the formation often flow into the pipeline, which can easily cause the surrounding strata to collapse, resulting in large-scale subsidence of the surface. In the construction of underground pipelines, how to effectively repair the leaking pipelines has always been a major problem in the engineering field. [0003] The traditional method is to set up dewatering wells to dewater the strata around the leaking pipeline, so that a temporary low water level area is formed around the pipeline, then clean the pipeline, and carry out water-stop repairs inside the pipeline, and then carry out re...

AI Technical Summary

Problems solved by technology

The water pumped out of the precipitation well will be immediately replenished by the river water above the pipeline, so no low water level area can be formed around the pipeline

[0005] At the same time, the water pressure at the bottom of the river is high. Once a leak occurs, there will be a large amount of water and soil in the pipeline in a very short period of time, which is very dangerous. The reason is that the groundwater pressure in the stratum where the cross-river pipeline is located is high. Stop the trend of water leakage in cross-river pipelines

In this case, it is also not possible to patch the leak inside the pipe

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