Hollow wall winding pipe, Hubei municipal sewage project application sharing

Hollow wall winding pipe is a structural wall drainage pipe made of high-density polyethylene, which is a widely used sewage pipe product in the domestic municipal engineering field. This content is based on the application data of a number of municipal sewage projects that have been landed in Hubei. The related projects cover the urban rain and sewage diversion transformation in Wuhan, Xiangyang, Yichang and other cities, the laying of sewage pipes in industrial parks, and the construction of main pipe networks in township sewage treatment plants. The cumulative application length exceeds 200 kilometers. Up to now, the operation status of all the pipes that have been put into use has remained stable.

The core practical advantages of this type of pipe mainly include four points: First, the ring stiffness adaptability is strong, the pipe adopts the hollow wall integrated winding molding process, and different ring stiffness grades can be flexibly selected according to the project depth and geological conditions. Under the general geological conditions of multiple soft soils and high groundwater level in Hubei, the pipe anti-settlement and external pressure performance are stable, and there are no problems such as pipe deformation and leakage in the projects that have been put into use. Second, the fluid transportation efficiency is high, the inner wall of the pipe is smooth, and the roughness coefficient is ≤0.009. Under the same pipe diameter conditions, the flow rate is increased by more than 30% compared with the traditional cement sewage pipe, and the inner wall is not easy to adhere to sludge and impurities. The later cleaning and maintenance cost can be reduced by about 40%, which can adapt to the actual needs of large-flow drainage in the rainy season and daily high-concentration sewage discharge in Hubei urban area. The third is convenient installation and construction. The single length of the pipe can be customized according to the needs of the project. The joint is connected by hot melt connection or elastic sealing ring, and the sealing performance is stable. For the rainy construction environment in Hubei and the short construction window period, the on-site installation efficiency is increased by 50% compared with traditional pipes, which can effectively compress the project construction cycle and reduce the comprehensive construction cost. The fourth is excellent environmental protection and corrosion resistance. The pipe material has strong chemical stability and can withstand sewage corrosion in the range of pH 4-10. The service life can reach more than 50 years under normal buried use conditions. No harmful substances are precipitated during production and use, which meets the application requirements of green building materials for municipal projects in Hubei.

The applicable scenarios of this pipe cover the construction of municipal rain and sewage diversion pipe network in Hubei region, the laying of urban domestic sewage pipe network, the construction of sewage trunk pipe in industrial concentration area, the construction of supporting drainage pipe network in sponge city, and the interception pipe network project of black and odorous water body treatment. The suitable population includes municipal engineering construction units, water supply and drainage design units, municipal project construction parties, pipe network operation and maintenance management units in Hubei, etc. All parties can choose models according to the needs based on the specific geological, buried depth, over-flow and other parameters of the project.

At present, this type of pipe has passed the national quality supervision and inspection of water supply and drainage pipes, and all performance indicators meet the national standard requirements of "Buried Polyethylene (PE) Structural Wall Pipeline System". In the long-term operation monitoring of many municipal sewage projects in Hubei, the leakage rate and failure rate of this type of pipe are far lower than the industry average, and can be used as a reliable pipe choice for municipal sewage projects.