Construction
Suzhou Tongjing Road North Extension Tunnel Project Double Line Through
Seetao 2021-09-01 09:33
  • After the opening to traffic, it will promote the social and economic development along the route, which is of great significance.
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On August 31, the right line of the Tongjing Road North Extension Tunnel, which was constructed and managed by the Suzhou Communications Construction Company and constructed by the 14th Bureau of China Railway, opened. The two lines have now been completed, marking the completion of the construction of the most critical shield main body of the project. , The two safe and smooth crossings of high-speed railways have laid a solid foundation for the completion and opening of the whole line.

The Shanghai-Nanjing Intercity Railway, which requires two undercuts for shield tunneling, has a design speed of 350 kilometers per hour. It is one of the busiest high-speed railway lines in my country. The minimum travel distance is 3 minutes, and the accumulated settlement needs to be controlled within 2 mm. There is no domestic precedent. At the same time, the covering thickness of the entire shield tunnel is less than twice the diameter of the shield tunnel, with the shallowest point being 6.47 meters and the deepest point being 13.15 meters; after the shield tunneling machine is launched, it will continuously traverse cultural preservation buildings and landscape rivers for a short distance, with concentrated risk sources , The construction is difficult.

The left line of the tunnel shield of the project started on October 26, 2020 and was the first to pass through on February 5 this year. After the right line of the tunnel shield started on May 20, it overcomes the impact of the new crown pneumonia epidemic, typhoon transit and other unfavorable factors. It was successfully completed on August 31. After monitoring, the cumulative settlement of the two shield tunneling constructions was controlled within 0.5 mm, which did not have any impact on the operation of the high-speed rail.

The person in charge of the project said that the “intelligent and precise control technology for large-diameter mud-water shields under complex construction environment conditions” summarized in the tunnel construction process was a domestic initiative and provided an example for solving similar problems in cities. Editor/Xia Changwang


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