Breaking through 4000 meters! Construction progress of China Railway Equipment's "Yunling Hao" TBM has been refreshed

The Central Yunnan Water Diversion Project in Yunnan Province is the first of the 10 landmark projects among the 172 major water conservancy projects promoted by the State Council. It is a strategic basic project for the development of Yunnan Province. After the project is completed, it can Fundamentally solve the water shortage problem in central Yunnan.

The Xianglushan Tunnel in Section 1 of Dali, constructed by China Railway Tunnel Bureau, is a key control project along the entire water diversion line in Central Yunnan. The main tunnel line is 26.54 kilometers long (of which the total length of TBM excavation is 21.06 kilometers) kilometers), and the proportion of Class IV, Class V, and Class V surrounding rocks is as high as 60%. Among them, there are as many as 11 fault zones and 8 soft rock large deformation sections with a total length of 3,676 meters.

The excavation diameter of the "Yunling" equipment reaches 9.83 meters. The equipment R&D and manufacturing team takes safety, reliability and adaptability as the primary criteria, targeting large deformation of soft rock and fault fracture zones. Precise design of geological conditions such as water inrush and mud burst can creatively solve industry-wide problems such as "rock bursts, large deformations, fault fracture zones" that may occur during construction, providing a strong guarantee for the safe, high-quality and efficient construction of the Central Yunnan water diversion project. .

Since the excavation of the "Yunling" TBM, all the construction personnel of the 3rd bid project of the Dali Section I of the Central Yunnan Water Diversion Project have used Technology, experience and hard work have overcome the world-wide problems of filling corrosion structures and high-dip fracture fracture zones, safely crossing the Qingcaitang fault zone and influence zone for more than 500 meters, and solving the construction problem of the Qingcaitang fault water-rich zone.

With the sincere cooperation and joint efforts of China Railway Equipment and China Railway Tunnel Bureau, the "Yunling" has achieved an average daily excavation support of 7.5 meters under Class V surrounding rock conditions. , creating a record of 38.6 meters of daily footage and 663 meters of monthly footage in the construction of Class III surrounding rock.