China's first railway double-line super-large diameter mud-water balance shield machine successfully tunneled

On November 1st, at the construction site of the Yuji Intercity Railway in Zhengzhou, Henan Province, the “Big Mac” shield with a diameter of 12.81 meters and a length of 78 meters broke out, marking the first in China. The Taiwan-Taiwan railway double-line super-large-diameter mud-water balance shield machine successfully traversed the 3.8-kilometer tunnel of the key control project of the line.

China's first railway double-line super-large diameter mud-water balance shield machine successfully tunneled

According to Zhang Keqiang, service manager of Tiejian Heavy Industry Project, this is the first time that China's large-section shield machine has crossed the South-to-North Water Diversion Main Canal at a close distance. The shallowest tunnel is only 9.5 meters deep, which is much smaller than the general tunnel design. Path requirements. At the same time, there is a large range of calcareous cemented formations in the tunnel crossing section, which places high demands on the excavation, scour, slag, sealing system and wear resistance of the shield machine.

In the equipment development stage, Tiejian Heavy Industry, China Railway 16th Bureau and the University Research Institute jointly tackled the problem, using oversized structural components, block design, manufacturing and assembly, high-efficiency mud circulation and cutterhead scouring, and large-diameter boring equipment digital modeling. Multi-source high-power synchronous drive and control, special robot auxiliary operation, high-precision excavation surface gas-liquid independent balance control, ultra-large diameter heavy-duty tube efficient reversal and many other innovative technologies to cope with long-distance and complex engineering geology .

Since its inception in January 2017, the equipment has overcome the difficulties of one-time long-distance crossing complex sections and successfully crossing the main canal of South-to-North Water Diversion; it has created a single-day excavation of 22 meters, a monthly excavation of 410 meters, and a one-time safe excavation of 3,800 meters. And a number of China's intercity railway large diameter double-track excavation record.

It is understood that the Yuji Intercity Railway Project connects the two major transportation hubs of Xinzheng International Airport and Zhengzhou High-speed Railway South Station, with a total length of 11.1 kilometers and a design speed of 200 kilometers per hour. It is expected to be completed and opened to traffic in October 2019. After the project is completed, the access time between the two hubs will be shortened from the original 50 minutes to 8 minutes. (This article comes from Tiejian Heavy Industry)