海底地铁隧道盾构机关键部位选型成败因素研究
吴玉礼
Shield Machine Key Parts Selection Factors for the Success Failure of Undersea Metro Tunnel Construction
WU Yuli
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作者信息:中铁十四局集团大盾构工程有限公司， 211899， 南京
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Affiliation:China Railway 14th Bureau Group Shield Engineering Co., Ltd., 211899, Nanjing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.12.034
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中图分类号/CLCN:U455.43;U459.5
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栏目/Col:施工技术
摘要:
为提高盾构施工效率，应合理进行盾构机关键部位的选型。以厦门首条穿海地铁隧道顺利贯通的实例，对盾构机穿越软土、上软下硬、孤石及断裂带等复杂地层的选型进行了全面解析，并结合实际应用效果进行了试验和改进。结果表明：盾构机在海底复杂地层掘进时可通过配置刀盘伸缩摆动功能，采用新型中心双刃滚刀、双独立人闸设计，优化刮刀保护块为类方锥形，增加搅拌棒数量，选用加厚和经过耐磨处理的泥浆管，优化出浆管液压球阀前手动闸板阀为液压驱动，专门设置一台泥水舱底部冲刷泥浆泵，提高碎石机耐磨性等一系列措施，来适应海底复杂地层的掘进。
Abstracts:
To improve shield construction efficiency, shield machine key parts should be reasonably selected. Taking the practical case of the successful construction of the first undersea metro tunnel in Xiamen, comprehensive analysis is carried out on the selection of shield machine while passing through soft soil, upper soft and lower hard, boulder, facture zone and other complex strata. Tests and improvement are conducted considering the actual application outcomes. Results show that: shield machine should be equipped with cutterhead telescoping and swing function for seabed complex strata excavation. New center hob design and double independent man gate design should be adopted, scraper protection block should be optimized in square-cone-like shape. The number of stir sticks should be increased, the thickened mud pipe with wear-resistant treatment be adopted. The manual gate valve before the hydraulic ball valve of the slurry pipe should be optimized to hydraulically driven. A mud tank bottom scour mud pump should be specially set up, and the wear resistance of the gravel crusher should be improved. Thus the machine can be adaptive to seabed complex strata excavation.
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