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

Factory acceptance of the largest domestically applied double-shield TBM in China

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 domestic and international design and construction cases of large-diameter hard rock TBMs and actively communicated with the construction unit, successfully completing the design and manufacture of the largest domestically applied double-shield TBM in China. The TBM is equipped with a hard rock cutterhead featuring high structural strength and high wear resistance, as well as a highly reliable main drive system with a long service life, to cope with ultra-long-distance tunneling conditions. Its key technologies, including the advanced drilling system, belt muck weighing system, intelligent grouting system, and air cooling system, provide strong guarantees for fast and safe TBM tunneling.

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