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首页> 外文期刊>Tunnelling and underground space technology >Creating a working space for modifying and maintaining the cutterhead of a large-diameter slurry shield: A case study of Beijing railway tunnel construction
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Creating a working space for modifying and maintaining the cutterhead of a large-diameter slurry shield: A case study of Beijing railway tunnel construction

机译：创造用于修改和维护大直径泥水盾构刀盘的工作空间：以北京铁路隧道建设为例

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摘要

During the railway tunnel excavation of the Beijing Underground Zhijingxian Project, which used a large-diameter slurry shield, excessive wear of the cutterhead and cutting tools was found. Cutterhead modifications as well as frequent maintenance on the cutterhead and cutting tools were necessary for sustained shield tunneling, and creating a reliable working space near the cutterhead remained critical to performing the maintenance operations. The tunnel crossing beneath densely populated areas and the tunnel face stability should be maintained during the intervention. A free air working space was created for the first cutterhead modification by excavating a shaft before the cutterhead. Inspection stops with ground reinforcement by the sleeve-pipe injection were well planned and arranged in advance. At the location for the second cutterhead modification, reinforcement by cast-in-place bored piles combined with the sleeve-pipe compensation grouting was employed. Repairs to the cutterhead were performed in an airtight space created in a two-meter diameter pile. In uttermost cases, ground improvement was not allowed. The compressed air working space was chosen. The hyperbaric interventions were safely performed with well-regulated air pressures and field-tested solutions against ground air leakage. In the different working spaces created in the complex geologies and under strict environmental constraints, the intervention works were safely completed. The shield advance was generally maintained at an accepted level, and the tunnel excavation was safely completed. Fortunately, the interventions were performed with less injury to the working personnel, and no decompression illness was reported. Undoubtedly, safety oriented principles that characterize reinforcing, airproofing and stabilizing the ground can be readily adopted to create a workspace for intervention activities in similar conditions.
机译：在使用大直径泥浆护罩的北京地下直井县项目的铁路隧道开挖期间，发现刀头和切削工具过度磨损。持续进行盾构掘进需要对刀头进行修改以及对刀头和切削工具进行频繁维护，并且在刀头附近创建可靠的工作空间对于执行维护操作仍然至关重要。干预期间应保持人口稠密地区下方的隧道穿越和隧道面的稳定性。通过在刀头之前挖出一个轴，为第一次刀头修改创造了一个自由的空气工作空间。事先计划好并安排了通过套管注入进行地面加固的检查站。在第二个刀盘改型的位置，采用了现浇钻孔桩与套筒管补偿灌浆相结合的加固方法。刀头的修理是在直径为两米的桩中形成的气密空间中进行的。在大多数情况下，不允许进行地面改进。选择了压缩空气工作空间。高压干预在调节良好的气压和针对地面空气泄漏的现场测试解决方案中安全地进行。在复杂的地质条件下和严格的环境约束下创建的不同工作空间中，干预工作已安全完成。盾构前进通常保持在可接受的水平，隧道开挖已安全完成。幸运的是，所进行的干预对工作人员的伤害较小，并且没有减压病的报道。毫无疑问，以加固，密封和稳定地面为特征的以安全为导向的原则可以很容易地为类似条件下的干预活动创造一个工作空间。

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