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PCCP pipeline construction method

A pipeline construction and pipeline technology, applied in the direction of pipeline laying and maintenance, pipe components, pipe/pipe joints/pipe fittings, etc.

Inactive Publication Date: 2020-12-29
TIANJIN ZHENJIN ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the existing PCCP pipeline construction, there is leakage in the pipeline installation, which seriously affects the normal use of the pipeline

Method used

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with specific embodiment:

[0029] A kind of PCCP pipeline construction method, concrete steps are:

[0030] S1, pipe groove excavation

[0031] Before trench excavation, measure the excavation plane position, pipeline axis distance, and horizontal elevation. Trench excavation should be carried out layer by layer and segmented from top to bottom. The excavation height of each layer is 2-3m. When excavating, reserve To stabilize the slope slope, when the excavation elevation reaches 20-30cm above the bottom of the pipe, manual excavation is used to avoid disturbance or over-excavation of the pipe foundation;

[0032] S2. Pipeline basic treatment

[0033] When the bearing capacity of the pipeline foundation is less than the bearing capacity of the pipeline and the upper covering soil, it is necessary to replace the foundation and backfill with crushed stones. Backfill some medium-coarse sand between th...

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Abstract

The invention relates to a PCCP pipeline construction method. The method comprises the specific steps that a pipeline groove is dug; a pipeline foundation is treated; pipe tripping, pipe distributionand hoisting are conducted; a pipeline is installed; the primary pipeline pressing test is carried out; the leakage part is treated, specifically, internal treatment is conducted, constructors enter the pipeline after water in the pipeline is emptied, and cement mortar filled at the joint position of the PCCP is chiseled away at first; SR plastic water stop materials are adopted for filling, and after filling is completed, basal plane treatment is carried out within the range of 300mm wide on the two sides of the pipeline joint; a BE14 interface agent is brushed onto the treatment area, and SKhand-scraped polyurea is brushed once after the surface is dried; then SK hand-scraped polyurea is brushed for 2-3 times, and it is guaranteed that the thickness of the polyurea meets the design requirement of 2mm; and S7, the pipeline pressing test is repeated, and installation is completed. According to the method, in the pipeline installation process, the leakage part is continuously repairedthrough the pressing test and the reasonable leakage repairing method, and the influence caused by the leakage problem in the pipeline installation process is well avoided.

Description

technical field [0001] The invention relates to the technical research field of PCCP pipeline construction, in particular to a PCCP pipeline construction method. Background technique [0002] PCCP pipe, also known as prestressed steel cylinder concrete pipe, refers to a water delivery pipe made by winding a hoop prestressed steel wire on a high-strength concrete core with a steel cylinder, and then spraying a dense cement mortar protective layer on it. It is a composite pipe made of thin steel plate, high-strength steel wire and concrete. PCCP pipe has many advantages such as wide application range, long economic life, good seismic performance, smooth pipe wall, good water conservancy conditions, good corrosion resistance, etc., and is widely used in large-scale water diversion projects. [0003] In the existing PCCP pipeline construction, there is a phenomenon of leakage during pipeline installation, which seriously affects the normal use of the pipeline. Contents of the...

Claims

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Application Information

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IPC IPC(8): F16L1/028F16L1/06F16L55/168F16L1/11
CPCF16L1/028F16L1/06F16L1/11F16L55/168
Inventor 胡宏林魏志学王鹏滕石罗正强项伟范士杰陆冬滨陈昭王鑫李先顺
Owner TIANJIN ZHENJIN ENG GRP
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