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Flexible duct rehabilitation construction method

A construction method and technology of flexible pipelines, which are applied in the directions of pipeline laying and maintenance, infrastructure engineering, pipes/pipe joints/fittings, etc., which can solve the problem that the structural strength of the pipeline is not strengthened, the flow area of ​​the pipeline is reduced, and the flow rate of the pipeline is affected, etc. It can prevent the corrosion of steel sheets and water leakage at the lap joint, increase the overall structural performance and reduce the loss.

Inactive Publication Date: 2020-04-28
SHANGHAI FOUND ENG GRP
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  • Application Information

AI Technical Summary

Problems solved by technology

The flow area of ​​the pipeline repaired by this process is seriously reduced, which affects the flow of the original pipeline, and it only treats the collapsed part, and the structural strength of other parts of the pipeline has not been strengthened, and similar problems may continue to occur

Method used

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  • Flexible duct rehabilitation construction method

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] Such as figure 1 Shown, a kind of flexible pipeline repairing construction method comprises the following steps:

[0019] (1) The upstream and downstream of the pipeline to be repaired by divers are sealed with airbags, and the pressure of the airbags is measured regularly. After the sealing is completed, the pipeline is pumped, toxic and harmful gases are detected, ventilated and the pipeline is cleaned;

[0020] (2) The outer soil of the pipeline at the deformed and collapsed part is reinforced by the large-diameter MJS grouting process to facilitate the excavation of the deformed and collapsed part.

[0021] (3) The construction personnel enter the interior of the pipeline and excavate with a foot of 300mm. After each foot of excavation, two semicircular stainless steel sheets are used to assemble a round pipe and fix it firmly to form an inn...

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Abstract

The invention relates to a flexible duct rehabilitation construction method. The method includes the steps that 1) the upstream and downstream parts of a duct to be rehabilitated are blocked through air bags, and water pumping, toxic and harmful gas detection, ventilation and duct cleaning are performed on the duct after blocking is completed; 2) soil on the outer side of the duct at a deformed and collapsed part is reinforced with a large-diameter MJS grouting process; 3) constructors enter the duct to dig at a certain footage, two semicircular liner steel sheets are adopted to be spliced into a liner duct piece after every footage of digging, a grouting hole is reserved in the middle of each liner duct piece, after the last footage of digging and liner duct piece arrangement are completed, the next footage of digging and liner duct piece arrangement are performed, and after treatment of the whole deformed and collapsed area is completed, cement paste is injected into gaps outside theliner duct pieces through the reserved grouting holes in the liner duct pieces for filling to ensure that the liner duct pieces are stable; and 4) overall rehabilitation is performed on the duct withan in-situ solidification technology, and after the rehabilitated duct is detected to be qualified, the air bags for blocking are removed to restore water circulation.

Description

technical field [0001] The invention relates to an underground pipeline repair construction method, in particular to a non-excavation repair construction method for large-diameter flexible pipelines. Background technique [0002] The deeper the pipeline is buried, the longer the age, the pipeline interface will age after a long period of disrepair, and the pipe itself has no elasticity, only plasticity. Cause groundwater to seep into the pipeline, and drive soil to enter the pipeline. After the soil around the pipeline changes, the pipeline is squeezed and deformed, and gradually develops into rupture and finally collapses. After the collapse, soil loss accelerated, and voids formed around the pipeline. If it is not treated in time, the flow area of ​​the original pipeline will be severely reduced or even blocked, which will affect the collection and transportation of sewage in the sewage pipeline, and at the same time, it is very likely to cause road surface subsidence, wh...

Claims

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Application Information

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IPC IPC(8): F16L1/26E02D3/12
CPCE02D3/12F16L1/26
Inventor 黄江川刘小会罗云峰李伟强李耀良
Owner SHANGHAI FOUND ENG GRP
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