Application of HDPE pipe in pipeline repair
In a project, when the pipeline is repaired using the lining method, the drainage is first performed before construction. Due to the short distance of the construction section and construction during the non-rainy season, the section closure construction is adopted to block the pipeline construction section. Excavating the work pit at the insertion end, due to the large diameter of the project and no construction site, the construction method is to drag the 6m section HDPE pipe from the work pit section into the old pipe and connect it. The work pit is the pipe inlet for the old pipe to knock off the upper half pipe and the side wall of the inspection well.
Since there are two rainwater and sewage confluence wells in the middle of the project rainwater pipeline, a total of three work pits are opened. Pipe cleaning: manually remove the silt and obstacles in the pipeline, and flush the original pipeline with water.
Buried grouting pipe and fixed pipe in the pipeline. Using 6 DN38 steel pipes, it is convenient for HDPE pipes to slide after resting, and the steel pipes are horizontally opened, with a hole diameter of 8-10mm and a hole distance of 1000mm, which is convenient for grouting. In addition, a wooden stick is positioned at the top of the pipe to prevent the HDPE pipe from floating after grouting.
The pipe section is towed mechanically or manually. Some pipe sections of this project use a hoist to tow the pipe, and the other parts are towed manually. Use the welding torch welding method to connect the HlPE pipe into sections in the pipeline, and special attention should be paid to ensure the welding quality.
After the construction is completed, the positioning (grouting) steel pipes processed in HDPE pipe and reinforced concrete pipe are welded according to the length of the pipe section, the expansion screw is installed on the original pipe wall, and the welding positioning (grouting) on ​​the expansion screw is calculated according to the design height Steel Pipe.
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