Recently, the largest domestically applied dual-shield TBM in China rolled off the production line at CRCHI's Changsha First Industrial Park and will soon be deployed for tunnel construction in Civil Works Section 1 of Bid Section 2 (Wuhe-Pingdi) of the Shenzhen-Huizhou Intercity Railway.

Factory acceptance of China's largest domestically applied dual-shield TBM

The TBM has an excavation diameter of 9.13 meters, a total length of about 120 meters, and a total weight of about 1,500 tons. The equipment mainly passes through slightly weathered and moderately weathered granite, with surrounding rock dominated by Class III and Class IV rock masses, and local small fault fracture zones; the maximum uniaxial saturated compressive strength is 131 MPa. The tunneling length is about 5 kilometers, with a burial depth of 50 to 100 meters.

In response to the geological characteristics of this project, the CRCHI R&D team conducted in-depth research on design and construction cases of large-diameter hard rock TBMs at home and abroad, and actively communicated with the construction unit, successfully completing the design and manufacture of China's largest domestically applied dual-shield TBM. The TBM is equipped with a hard rock cutterhead featuring high structural strength and high wear resistance, as well as a highly reliable long-life main drive system, to cope with ultra-long-distance tunneling conditions. Its onboard key technologies, including an advance drilling system, a belt muck weighing system, an intelligent grouting system, and an air cooling system, provide strong guarantees for fast and safe TBM tunneling.

It is reported that once completed, the Shenzhen-Huizhou Intercity Railway project will effectively promote the construction of the "five vertical and four horizontal" intercity network in the Shenzhen metropolitan area, and is of great significance for building a "Greater Bay Area on rails," advancing Shenzhen-Dongguan-Huizhou integration, accelerating the development of an interconnected transportation framework in the Greater Bay Area, and driving the growth engine of the eastern Pearl River Delta.