Large diameter DN2000 carat pipe, for municipal trunk pipe network

As the aorta of the urban drainage system, the municipal trunk pipe network has strict requirements on the flow capacity, structural stability and long-term operation safety of the pipe. When the pipe diameter jumps to DN2000 level, the high-density polyethylene wound structural wall pipe, which is often called carat pipe in the industry, has become a reliable choice in large-scale gravity flow drainage projects due to its unique molding process and structural advantages.

The pipe is made of high-density polyethylene raw material, which is wound and formed under hot state to form a composite pipe wall structure with special-shaped reinforcing ribs on the outer wall and smooth and flat inner wall. This design effectively improves the ring stiffness while greatly reducing the material consumption per unit length, making the DN2000 specification pipe not only capable of withstanding deep earth pressure, but also easy to lift and transport. The Manning coefficient advantage of smooth inner wall can effectively reduce the head loss in large-diameter long-distance transportation and maintain the efficient hydraulic performance of the pipe network system.

In municipal trunk pipe applications, interface reliability is a core concern. The pipeline is usually connected by socket-type electrofusion connection or throttle socket sealing ring. The reinforcing ribs at the interface and the welding material form an integrated homogeneous connection after installation, which can effectively resist the shear stress caused by uneven settlement and meet the environmental protection requirements of zero leakage. For sections with high groundwater level or soft soil foundation, the DN2000 carat pipe has good flexibility and impact resistance, which can adapt to a certain degree of soil displacement and reduce the risk of rigid fracture.

From the construction point of view, its weight is only about one-tenth of the same specification of concrete pipes, and it can be arranged in the trench without large lifting equipment, which significantly shortens the construction period and reduces the interference to urban traffic. At the same time, the pipeline can be prefabricated by electrofusion at the edge of the trench according to the needs of the site, and then the pipe can be lowered as a whole, further ensuring the quality of the interface.

When selecting DN2000 carat pipe as the main pipe network, it is necessary to reasonably determine the ring stiffness grade according to the working conditions such as burial depth, dynamic load grade and groundwater level, and strictly follow the backfill compaction specification to ensure the formation of the pipe-soil interaction system. Scientific design selection and standardized construction control are the basis for the long-term service efficiency of this large-diameter pipe.