Sutong GIL Integrated Pipe Gallery Project is a major technological innovation in the application of large-diameter shield tunnel engineering to power engineering（vacuum contactor）, and all indicators can reach domestic models. "On December 18th, Sutong GIL Integrated Pipe Gallery Engineering Tunnel Engineering Experts Acceptance Meeting was held in Changshu, Jiangsu Province. The team leader of the acceptance team and the Chinese Academy of Engineering Qian Qihu highly praised the project.
After inspecting and listening to the report on the tunnel site, the acceptance expert team unanimously agreed that the tunnel project of the Sutong GIL Integrated Pipe Gallery project passed the acceptance check.
Sutong GIL Integrated Pipe Gallery Project is the ultra-long-distance GIL innovation project with the highest voltage level, the largest transmission capacity and the most advanced technology level in the world. It is the “throat main road” and controllability of the East China UHV AC double loop network. engineering. The project started construction in August 2016. In June 2017, the shield machine was successfully launched. On August 21, 2018, the tunnel was successfully completed and the tunnel construction was completed in November.
The tunnel project has a total length of 5468.5 meters and crosses the deep trough section of the narrow section of the lower reaches of the Yangtze River. The diameter of the shield is 12.07 meters, the lowest point is -74.83 meters, the maximum slope is 5%, and the maximum water and soil pressure is 9.5 times atmospheric pressure. It is the deepest tunnel with the highest water pressure in China. The project adopts a number of innovative technologies, which have solved the problems of tunnel settlement control, high water pressure, anti-seepage water, anti-harmful gas, narrow tunnel space, etc., creating the speed of the shield machine, overall transportation, assembly and debugging, and through. A number of domestic firsts in dismantling and other aspects. The shield machine drilled 417 meters per month,which was nearly a quarter higher than the domestic record and completed the milestone plan two months ahead of schedule.