内插型锁口管幕群姿态-锁口控制技术试验研究

为研究上海市田林路下穿中环线新建工程管幕-箱涵穿越段所采用的内插型锁口的可行性与安全性，在其临近位置开展内插型锁口管幕群顶进试验，并结合数值模拟方法对管幕钢管自身刚度、锁口刚度与管幕顶进顺序、管幕掘进与姿态控制技术、管幕钢管顶进减摩与顶力控制4大方面进行研究。通过等比例试验及数值模拟，结果表明： 1）通过内插型锁口相互连接，管幕钢管的姿态可控、闭合顺利、止水良好； 2）采用内插型锁口的管幕钢管具备良好的自身刚度； 3) 试验采用的特种管幕掘进设备、纠偏系统及后配套系统能够精准地控制管幕钢管顶进精度，可将轴线偏差控制在±1 cm； 4) 内插型锁口能发挥显著的锁口导向作用。

Experimental Study on Attitude Interlock Control Technology of Pipe curtain Group with Inner Interlock Joints

The jacking experiment is carried out on pipe curtain group with inner interlock joints adjacent to Tianlinlu Project in Shanghai crossing underneath pipe curtain box culvert section, so as to study the feasibility and safety of inner interlock joints. The curtain pipe stiffness, interlock stiffness and curtain pipe jacking sequence, jacking excavation and attitude controlling technology, and jacking lubrication and jacking force control are studied by numerical simulation method. The experiment and simulation results show that: (1) With the help of inner interlock joints, the accurate attitude control, smooth curtain pipe closure, and good water proofing performance can be guaranteed. (2) The curtain pipes with inner interlock joints have sufficient stiffness. (3) The boring machines, deviation controlling system and backup system adopted can precisely control the pipe curtain jacking with axis deviation within ±1 cm. (4) The inner interlock joints have effective guiding effect in the experiment.