有限空间盾构隧道精密控制网传递技术研究

Research on Transmission Technology of Precision Control Network forLimited Space Shield Tunnel

为解决传统地铁盾构施工测量控制网投影传递存在的不足,提出一种以可拆卸的钢丝托架以及隧道内强制对中托架为基础的盾构掘进精密测量技术。使用可拆卸式的钢丝托架代替传统的半永久性固定支架悬挂钢丝,同时以悬挂三根钢丝的一井定向控制网传递方式代替一井双丝形式,利用锁定在管片上的强制对中托架将隧道内的单闭合导线优化为双闭合导线。实践结果表明,有限空间盾构隧道精密控制网传递技术能够适应场地较小的单井盾构始发井施工,节约了盾构机停机时间12天;该技术指导了9条盾构区间隧道按照设计路线如期贯通,直接经济效益超过900万元,测量精度提高了约2倍。综上所述,这项技术大大减少了导线测量与盾构掘进运输相互制约的情况,提高了导线测量精度,达到了提高生产效率的目的。

To address the shortcomings of traditional subway shield tunneling measurement control network projection transmission,a precision measurement technology for shield tunneling based on detachable steel wire brackets and forced centering brackets inside the tunnel is proposed.Using detachable steel wire brackets instead of traditional semi permanent fixed brackets to suspend steel wires,and using a single well directional control network transmission method with three steel wires suspended instead of a single well double wire form,the forced centering bracket locked on the pipe segment is used to optimize the single closed wire in the tunnel into a double closed wire.The practical results show that the precision control network transmission technology for limited space shield tunnels can adapt to the construction of single well shield starting wells with smaller sites,saving 12 days of shield machine downtime;This technology has guided 9 shield tunneling sections to be completed as scheduled according to the design route,with direct economic benefits exceeding 9 million yuan and measurement accuracy improved by about√2 times.In summary,this technology greatly reduces the mutual constraints between wire measurement and shield tunneling transportation,improves wire measurement accuracy,and achieves the goal of improving production efficiency.