同一始发井内顶管双向顶进后背体系设计与施工技术  

Design and Construction Technology of Back System of Two-way Jacking Pipe in the Same Starting Well

作　　者：张兆军[1] 彭焱锋 刘维正[2] 鲜斌琪 谭际鸣 张毅[1] ZHANG Zhaojun;PENG Yanfeng;LIU Weizheng;XIAN Binqi;TAN Jiming;ZHANG Yi(China Railway Tunnel Group No.2 Engineering Co.,Ltd.,Sanhe,Hebei065201,China;School of Civil Engineering,Central South University,Changsha,Hunan410075,China)

机构地区：[1]中铁隧道集团二处有限公司,河北三河065201 [2]中南大学土木工程学院,湖南长沙410075

出　　处：《施工技术（中英文）》2024年第19期86-92,共7页Construction Technology

基　　金：湖南省建设科技计划(KY202108);中铁隧道局集团科技创新计划(隧二研合2020-08)。

摘　　要：针对地下管廊工程中进行两段及以上顶管作业的情况,基于南昌市丹霞路道路及综合管廊工程EPC项目顶管工程实例,对在同一始发井内同时进行双向顶管作业技术进行分析研究。建立数值计算模型,对相关结构体系受力进行分析,并结合有限元数值模拟的方法,对不同施工顺序下的受力特性进行对比。结果表明:在相同荷载下,顶推一侧两舱时后背墙受到的最大弯矩较对称顶进时大,后背体系结构在各工序下均满足受力与稳定性要求。揭示了在较大顶管始发井内采用肋板式后背墙作为背部支撑、通过钢套箱后靠背分配主顶油缸反力、同时设置双排双向后背体系方式的可行性。进一步提出后背墙结构的施工与拆除技术,并通过实际工程中后背墙变形监测验证了实施效果。According to the situation of two or more pipe jacking operations in the underground pipe gallery project,based on the pipe jacking engineering example of the comprehensive pipe gallery EPC project of Danxia Road in Nanchang,the technology of two-way pipe jacking operation in the same originating well was analyzed and studied.A numerical calculation model was established to analyze the stress of the relevant structural system.Combined with the finite element numerical simulation method,the stress characteristics under different construction sequences were compared.The results show that:under the same load condition,the maximum bending moment of the back wall when pushing two pipes on one side is larger than that when pushing symmetrically.The back structure meets the requirements of stress and stability in each engineering process.The feasibility of using rib type back wall as back support,distributing the reaction force of main jacking cylinder through the back of steel boxed box,and setting double row and two-way back system in the large jacking launching well is verified.The construction and demolition technology of the back wall structure is further proposed,and then verified by the deformation monitoring of the back wall in the actual project.

关 键 词：综合管廊 顶管 双向顶进 后背体系 数值模拟 监测 

分 类 号：TU990[建筑科学—市政工程]