The world's longest highway underwater shield tunnel, the Haitai Yangtze River Tunnel, has good news, and the construction of the enclosure structure has come to a successful end. On the afternoon of March 23, with the last ground wall reinforcement cage successfully entered the groove and completed the pouring, this marks the official opening of a new chapter in the foundation pit foundation reinforcement and excavation construction of this super project.
At the Jiangnan construction site of the Haitai Yangtze River Tunnel of the China Communications Tunnel Bureau, two crawler cranes staged a wonderful "steel cage air dance" in the air like two dancers with tacit understanding. The huge Z-width steel cage, with an upper length of 40 meters and a weight of 75 tons, and a lower length of 29.5 meters and a weight of 55 tons, was steadily hoisted to the predetermined slot, successfully completing its mission.
It is understood that the soil layer within the construction scope of the Haitai Yangtze River Tunnel is complex and changeable, and the bad soil quality such as sand and silt is endless, coupled with the shallow groundwater depth and high confined water head, it is like construction in the "geological labyrinth". The technical staff rose to the challenge, prepared a detailed construction plan, and also carried out strict training for the workers to ensure that every link is kept improving.
The Haitai Yangtze River Tunnel has a total length of 39.07 kilometers, of which the tunnel section is 11.18 kilometers long. The outer diameter of the shield tunnel section reaches 16 meters, which is not only the longest underwater shield tunnel in China, but also known as the "first tunnel of the Yangtze River". The shield starts from the working shaft on the north side of the river in Haimen, Nantong City, crosses the Yangtze River all the way, and goes directly to the receiving shaft on the south side of the Yangtze River in Taicang, Suzhou City.
In the face of the structural challenges of ultra-deep underground diaphragm walls with a depth of 70 meters, as well as the problems of poor soil quality and confined water at the bottom of the groove, the staff of the project department invited the expert group to demonstrate and optimize the scheme for many times, reviewed and summarized it in combination with the actual situation of the site, and finally selected the best construction plan. In terms of quality assurance, safe production and civilized construction, they are also unambiguous, strictly follow the requirements of their superiors, and comprehensively implement the construction without dead ends to ensure that the project can be completed on time, according to quality and quantity.
In the future, the project team will continue to keep an eye on the progress of the construction period to ensure that the goals of safety and quality, management improvement and other goals are not relaxed. They will escort the smooth progress of the project with more enthusiasm and a more professional attitude. (Reporter Wang Yanxia, correspondent Godwang, Li Yandong)
Source: Pocket Nantong client