China's first constant pressure tool changer large diameter shield machine offline

On September 24th, jointly developed by China Railway Construction and China Railway 14 Bureau, China's first self-developed bladeless super large-scale muddy water balance shield machine with complete independent intellectual property rights was successfully accepted in Changsha. . The birth of this equipment has filled the blank of China's domestic shield machine atmospheric pressure tool change technology, and also created the most beautiful "Peach Blossom" cutter disk in the history of shield machine.

"Luan-An" is tailor-made for the Changjiang Minjiang River Tunnel in Hunan. The excavation diameter of the equipment is 11.75 meters, the length of the whole machine is 132 meters, the total weight is about 3,000 tons, and the installed power is 6,100 kilowatts. It is expected that the end of September will arrive at the construction site one after another.

According to Liao Jinjun, director of the Institute of Basic Technology of the Tiejian Heavy Industry Hydraulic Research and Design Institute, according to the geological survey results of the construction site, Changjiang Tujiang River Tunnel has large excavation sections, complex hydrogeological conditions, high strength through the formation, high permeability, high water content. Pressure and other characteristics. At the same time, the flood control embankment of the Lancang River is artificially filled, and the geological layer of the tunnel is rich in pebbles. The homogeneity is poor, which poses a great challenge to the construction of the cutterhead of the shield machine.

"We have adopted the first-ever atmospheric pressure change tool technology." Liao Jinjun said. This greatly reduces the risk of pressure-replacement operations in the artificial belt of the slurry shield, effectively improves the efficiency of tool change operations, reduces the cost of tool change under pressure conditions, and makes the tool change operations more convenient and reliable.