Based on the construction experiences of the intercepting sewer main engineering in the urban area of Zhangjiakou City and the Yangfang ewer main engineering of Xuanhua City, this paper sums up the construction quality diseases in the flexible joints of drainage pipelines system, analyzes the reasons of these quality diseases, and puts forward some preventive measures.

This article describes the concrete and reinforced concrete drain pipes with spigot and socket, rebated socket or steel-collar socket flexible joints, and the process for their fabrication.

This paper researches the mechanical property of the ductile interface,and analyzes the seismic performance of the UPVC underground water pipeline covered with soil through the experiment analysis of the flexible joint of the UPVC underground water pipelines covered with soil.

According to the interface type, the new-type drainage cast-iron pipe with flexible interface can be divided into two kinds, A-type flexible interface and W-type no-faucet pipe hoop.

Analysis of dangerous factors and countermeasures during the production of integrated port;