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钱江隧道江北工作井起讫里程桩号(以左线计)为LK11+978～LK12+005,是盾构机的调头井,在施工阶段需满足接收、调头、始发3个功能,在运营阶段,需考虑行车、通风、设备、消防、疏散救援等功能。基坑平面尺寸设计成49.4 m×29.4 m,深27.3 m,属于软土地区超深基坑。围护结构采用54 m深、1.2 m厚地下连续墙,内支撑采用5道钢筋混凝土支撑和1道钢管支撑,平面布置采用斜角撑形式。主体结构分析考虑了3个阶段,即基坑开挖阶段、盾构机调头作业阶段、运营阶段。其中盾构机调头作业阶段考虑了6个工况。主体结构内衬墙浇筑采用了半逆筑法施工以减少结构变形、提高安全性;同时,鉴于江北工作井周围无敏感建筑物,且总体工期较为紧张,因此,混凝土支撑采用了爆破拆除方案。
Qianjiang tunnel Jiangbei work from the start and end of the mileage pile station (left line) is LK11 +978 ~ LK12 + 005, is the shield machine drilled shaft, in the construction phase to meet the receiving, U-turn, starting three functions in operation Stage, need to consider driving, ventilation, equipment, fire fighting, evacuation and rescue functions. The foundation pit is designed to be 49.4 mx 29.4 m in depth and 27.3 m in depth, belonging to the ultra-deep foundation pit in soft soil area. The retaining structure adopts a 54 m deep and 1.2 m thick underground continuous wall, the inner support is supported by 5 reinforced concrete supports and a steel pipe support, and the plane layout is in the form of bevel bracing. The main structure analysis takes into account three stages, namely, excavation stage, shield machine turning operation phase and operation phase. Among them, the shield machine turning work phase considered six working conditions. The main structure of the lining of the wall pouring using semi-inverse construction method to reduce the structural deformation and improve safety; the same time, in view of Jiangbei wells around the sensitive buildings, and the overall construction period is more stressful, so the concrete support using blasting program.