盾构施工近距离下穿大断面公路隧道施工技术研究

Construction Technology of Shield Construction Close to Underpassing Large Section Highway Tunnel

文章结合郑州市南四环至郑州南站城郊铁路工程郑港九路站~郑港六路站盾构施工情况,从分析施工难点入手,采用三维数值计算程序MIDAS/GTS,对一级风险源的通道施工过程进行预分析,在计算值处于可控范围情况下提出盾构在穿越过程中对通道结构采取压重处理。并结合施工难点对盾构机近距离下穿富士康公路通道的掘进参数控制,盾构机对富士康地下通道的影响分析及保护措施,通道沉降变形监测技术及盾构通过后的技术保障进行了阐述,通过采取技术措施,盾构安全顺利地通过了富士康地下通道。该研究可为今后盾构机近距离下穿建(构)筑物技术提供一定的技术参考。

Combined with the shield construction of Zhenggang No.9 Road to Zhenggang No.6 Road in the suburban rail-way project of south fourth ring road to Zhengzhou South Railway Station,and based on analysis of construction difficulties, preanalysis was made on the first-grade risk source during the passage construction by adopting the three-dimensional nu-merical calculation program---MIDAS /GTS.Under a controllable range of calculated value,weight loading treatment technology was put forward during the process of shied crossing passage structure.In conjunction with the control of con-struction difficulties to the tunneling excavation parameters of the shield machine close to underpassing the passage of Fox-conn Highway,and effects analysis and protection measures on shield machine to Foxconn underground passage,monitoring technology of passage settlement deformation and technical guarantee after the shield were expounded.Through adoption of technical measures,the shield machine safely passed through Foxconn underground passage,the study could provide a cer-tain technical reference for shield machine close to underpassing the building in future.