On March 26th, 12.68m diameter TBM ‘Strong Foundation’ developed by China Railway Construction Heavy Industry Corporation Limited (CRCHI) rolled off the assembly line in Changsha, Hunan Province. The TBM is the world’s largest diameter EPB double shield convertible TBM, according to CRCHI.
The TBM will be used during the construction of a 12.28km water transfer tunnel for the southern segment of the Hangzhou- Jiaxing-Huzhou West Channel Tunnel and marks a major breakthrough in the field of ultra-large diameter tunnel boring machine in China, “injecting new momentum in science and technology for urban flood control and drainage and underground space development,” the company says.
To address the complex ground conditions such as uneven hard and soft stratum, alternating hard and soft geology, ‘Strong Foundation’ adopts a ‘TBM + shield machine’ coexisting dual muck discharge system and modular dual-mode cutter head design, which creatively solves the complex stratum tunnelling problems, and improves the overall TBM construction quality and efficiency .
In a statement CRCHI explains, “‘Strong Foundation’ is deeply integrated with digital technology, equipped with an intelligent auxiliary tunnelling system and segment automatic lifting and transportation system. The operator can monitor more than 20 parameters such as cutter head rotation speed and thrust speed in real time through the intelligent interface, and the tunnelling error will be controlled in millimetre levels by relying on the automated guidance system. The application of digital twin technology can realize the visual control of the whole construction process and promote the transformation of underground engineering to ‘less manned and intelligent’.”
The expansion of Hangzhou-Jiaxing-Huzhou South Drainage West Channel Tunnel Project is said to be the largest drainage tunnel diameter and buried depth of any Chinese tunnel drainage system projects. It will prevent flooding and drainage, while improving the water ecological environment. Once completed, it will reduce the pressure on flood control in the Taihu Lake basin, ensure safe drainage to the west of Hangzhou, construct a safety barrier for the main city of Hangzhou, and promote the development of the regional economy.
CRCHI
Established in 2007 and subordinate to China Railway Construction Corporation Limited, China Railway Construction Heavy Industry Corporation Limited (CRCHI) is a...
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