It is understood that the investment in the construction of the tail water discharge pipe (sea section) project of tieshangang district Sewage Treatment Plant is mainly to solve the deep-sea discharge problem after the sewage treatment of Tieshan Port (Linhai) Industrial Zone Sewage Treatment Plant, Sinopec Project and Stora Ensorin Paper Integration Project reaches the standard. This project is located in the south side of the open drainage channel of Tieshan Port (Linhai) Industrial Zone, starting from the deep-sea drainage well on the east side of Yingzha Road, passing through the 65438+ 10,000-ton waterway and harbor basin of Tieshan Port from the seabed, and reaching the deep-sea B3 discharge port. The total length of the underground pipeline in this project is 4,350m, and it is constructed in three sections, in which the buried pipe section for land excavation is 74 1m and the pipe diameter is 1.5m; the submarine pipe jacking section is 3,209m and the pipe diameter is 2.0m.: The submarine diffusion pipe section is 400 meters with a diameter of 2.0 meters.
This project is a municipal project of submarine construction at sea. Before the pipe jacking operation, two artificial islands need to be reclaimed from the sea, and then two working wells with a diameter of 15m and a depth of 35m are drilled on the artificial islands as platforms for pipe jacking construction. Pipe jacking construction can only be carried out after the completion of the working well. The maximum depth of pipeline seabed is 24m (below the seabed). The seabed topography where the pipeline passes is complex, the soil is unevenly distributed and changes frequently, so the pipe jacking construction is very difficult. In addition, the working well faces external threats such as seawater intrusion, foundation pit leakage and typhoon at any time.
The project owner Beihai Lugang Construction Investment Development Co., Ltd. adopts EPC mode to ensure that the investment is controllable. The project started construction in February 2065. The design and construction general contractor carefully organized and formulated a scientific construction plan. In the construction process, the complex geological difficulties of kaolin hard soil and the uneven distribution of soft and hard soil in the same section were solved, and many technical problems were solved. The length of one-time jacking pipe successfully reached 2180m, which broke the record of one-time jacking in Shantou's second cross-sea pipe jacking construction in 2008.
The completion and use of this project will greatly improve the comprehensive sewage treatment capacity of Tieshan Port (Linhai) Industrial Zone, further improve the infrastructure of the park, provide guarantee for the introduction of more projects in the park, and also play an active role in the ecological and environmental protection construction of the park.