狭窄斜交横通道内多台盾构接收关键技术研究

Receiving Technology of Multiple Shields in Oblique Cross Passage under Complex Conditions

为解决盾构接收时无法从接收井正下方拆机吊出的难题,通常的做法是在盾构到达后,通过设置暗挖横通道的方式,将盾构平移至指定位置的竖井处,再进行拆机并吊出。为解决北京地铁新机场线1#风井工程遇到的多台盾构于同一横通道接收、空间狭窄并且隧道与横通道斜交的工程难题,通过多方协调、严格管理,设计出一套合理且严谨的多台盾构接收方案和参数控制标准,解决了在狭窄空间内进行多台盾构平移接收的施工组织设计难题,并采用预埋钢环板管片、喷混凝土填充、环形钢板焊接封闭和预拌喷混凝土料装袋封堵等手段处理了斜交条件下盾构密封失效的问题,同时对横通道与隧道设计提出了一些思考。

To solve the problem that the shield cannot be disassembled and hoisted out directly from the receiving shaft,a mined cross passage is built to move the shield to the vertical shaft in conventional solution.In a case study,multiple shields should be received in an oblique and narrow cross passage of#1 ventilation shaft project on New Airport line of Beijing metro.Accordingly,a set of reasonable and rigorous receiving scheme and parameter control standards for multiple shields are designed,and the shield seal failure problem is solved by adopting the embedded steel ring plate segment,shotconcrete filling,circular plates welding,and pre-mixed shotconcrete and material bag.Finally,some thinking is put forward for the design of cross passage and tunnel.