DOI: 10.11648/j.jccee.20261105.12 ISSN: 2637-3890

Key Technologies for Cutterhead Repair of Large-Diameter Slurry Balance Shield Under Atmospheric Pressure Access

Gu Tianxin, Wang Kai, Chen Qiao, Wan Xueyu, Bao Peng
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Aiming at the common engineering challenges of severe wear, eccentric wear, and seal failure of cutterheads during the excavation of large-diameter shields in hard rock strata, this study investigates the in-situ cutterhead repair technology under atmospheric pressure access conditions, based on the cutterhead damage repair project of the φ15.01 m slurry balance shield on the left line of the Zhijiang Road Water Conveyance Pipe Gallery and Road Improvement Project in Hangzhou. Through stratum stability assessment, verification of atmospheric pressure access conditions, excavation and support of working chambers, staged repair of cutter boxes, panel welding reinforcement, non-destructive testing of welds, pressure-holding tests, and trial tunneling parameter control, a complete set of repair technologies applicable to large-diameter shield cutterhead repair under atmospheric pressure in moderately weathered hard rock strata has been developed. Engineering practice demonstrates that this approach enables rapid cutterhead repair without the need for additional excavation or equipment disassembly, with repair accuracy meeting design requirements. Throughout the construction process, ground surface settlement and deformation of buildings and structures remain within controllable limits, effectively ensuring the safety of adjacent cultural relic buildings and existing pipelines. The research results provide technical references for the treatment of cutterhead damage in large-diameter shields constructed in hard rock strata within urban core areas.

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