China’s first domestic 3-meter main bearing shield machine “China Railway 872” was launched at the east station of Zhongxin avenue of Suzhou rail transit line 6 on June 26. This is the first time that the equipment in this field has carried out underground tunneling task in the field of rail transit after breaking through the bottleneck of independent technology development of shield main bearing. The project is led by China Railway Shanghai Engineering Bureau, and its self-developed “China Railway 872” shield machine is the first 3-meter domestic main bearing shield machine which has passed the national strong foundation engineering test in China. The equipment excavation diameter is 6.83 meters, the main bearing diameter is 3.06 meters, the machine length is about 85 meters, the total weight is about 550 tons, and the maximum tunneling speed is 0.1 meters / minute. It is reported that the “journey” of “China Railway 872” shield machine is 866 meters long from the east station of Zhongxin avenue to Susheng Road Station of Suzhou rail transit line 6, and the construction is expected to be completed on November 30. < / P > < p > “the commissioning of the ‘China Railway 872’ shield machine is the first time that China has realized the localization of main bearing manufacturing, and has taken a key step in the localization of the core technology of large-scale equipment.” Yin Jinqiu, project manager of the 10th bid of Suzhou rail transit line 6 of China Railway Shanghai Bureau, said that the commissioning of the equipment will continue to verify the performance and reliability of the main bearing, reducer, frequency converter and other key parts of the domestic shield machine, and support the further improvement of the domestic equipment with the actual data. Global Tech