盾构近距离侧穿团结渠桥桩风险控制技术

RISK CONTROL TECHNOI OGY FOR SHIELD TUNNELING PA SSING THROUGH TUANJIE CANAL BRIDGE PILES IN CLOSE PROXIMITY

以北京地铁16号线工程土建施工04合同段屯佃站~屯永区间盾构接收井盾构区间下穿团结渠及侧穿团结渠桥桩为例,针对盾构近距离侧穿团结渠桥桩风险控制进行研究,采用设定试验段的方法,总结盾构近距离侧穿桥桩时掘进参数,建立土压平衡,控制出土量,保证土舱压力,控制同步注浆压力、注浆量与掘进速度的协同作用,确保管片壁后的空隙充满,减小隧道围岩径缩、地层沉降。并采取径向注浆加固措施,确保盾构稳定、匀速通过团结渠及团结渠桥。同时对团结渠及周边地表进行实时监测,保证了团结渠桥的安全稳定。

Taking the civil construction contract section 04 of the Beijing Metro line 16 project from Tundian station to Tunyong section,as an example,the risk control of the shield tunnel passing through the Tuanjie Canal and the bridge pile passing through the Tuanjie Canal on the side is studied.Using the method of setting a test section,summarize the excavation parameters of shield tunneling when passing through bridge piles at close range,the soil pressure balance is established,the soil output is controlled,the soil warehouse pressure is ensured,and the synchronous grouting pressure is controlled.The synergistic effect of grouting amount and excavation speed ensures that the gaps behind the pipe wall are filled,reduces the shrinkage of tunnel surrounding rock and formation settlement.And radial grouting reinforcement measures are taken to ensure the stability and uniform speed of the shield tunneling through the Tuanjie Canal and Tuanjie Canal Bridge.At the same time,real-time monitoring was carried out on the Tuanjie Canal and surrounding surface,ensuring the safety and stability of the Tuanjie Canal Bridge.