Recently, China Energy Construction Zhejiang Institute completed the Taizhou Binhai-Baishu 500 kV line engineering survey work.

The project includes the Jiaojiang large-spanning section and the general line section. Among them, the length of the Jiaojiang Crossing Line is 2 times 3.87 kilometers, and the length of the general line section is 2 times 66.7 kilometers. Due to the airport clearance and lower navigation requirements, it is necessary to build two-base mid-river iron towers in the strong tidal channel of the Jiaojiang River. The tower foundation piles are more than 90 meters long, which is currently the longest cast-in-place pile pile for the underwater iron tower foundation of a transmission line in China.

A large-tonnage drilling iron ship was used as the operating platform to perform this task, and each platform was equipped with a traffic ship and a guard ship. Exploration holes were laid out according to the location of the tower base. A total of 18 exploration holes were arranged in this survey, with 9 holes on each tower base.

The completion of the survey work ensured the overall progress requirements of the project and provided stratigraphic data and geotechnical design parameter data for later design and other work. After the project is put into operation, it will become an important part of the Taiwen power grid\'s 500 kV coastal dual channel, provide conditions for the subsequent 500 kV hierarchical zoning of the Zhejiang UHV ring network, and solve the weak electromagnetic ring in the Huipu-Binhai supply area. Network problems and Cypress 500 kV substation terminal station and other problems to improve the power supply capacity of Zhejiang Power Grid. (Tan Jia)