China's first remanufactured shield using domestically produced main bearings was successfully rolled off in Hefei and passed the acceptance of the China Quality Certification Center. This indicates that China has broken through the bottleneck of the main bearing development in the field of shield remanufacturing, ending the history that China cannot produce such high-end bearings.

The equipment is an earth pressure balance shield for remanufacturing in Hefei strata excavation. China Railway Tunnel Group pioneered the use of scientific research + manufacturing order-based production mode. Under the leadership of the scientific research team of the National Key Laboratory of Shield and Tunneling Technology, it cooperated with Luoyang LYC Bearing Co., Ltd. to realize the localization of the main bearing of the shield. .

It is understood that the new main bearing diameter of 2.6 meters, can meet the diameter of 6-7 meters shield continuous work more than 15,000 hours, formed six independent intellectual property rights and a number of special standards for raw material design, marking that China has mastered the tunnel The core technology of the shield machine broke the technological monopoly of a few foreign companies.

As a short-life, high-value cost equipment, the shield has more than 1,200 domestic reserves. As its “aging” has intensified, a large number of shields face serious performance degradation, increasing use costs and even scrapping. The remanufacturing of them has significant social and economic benefits.

In 2016, the Ministry of Industry and Information Technology identified the pilot unit for shield remanufacturing. The China Railway Tunnel Group is the only construction company to be included in the pilot unit of shield remanufacturing.




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