大型沉管隧道连接段主体结构关键施工技术  

Key Construction Technology of Main Structure for Connection Segment in Large Immersed Tunnel

作　　者：张志安[1] 

机构地区：[1]中铁十八局集团第五工程有限公司,天津300456

出　　处：《施工技术（下半月）》2012年第9期113-116,共4页Construction Technology

基　　金：住房和城乡建设部科研项目(2012-S3-9)

摘　　要：天津市滨海新区中央大道海河隧道工程采用沉管法施工。该沉管隧道连接段是连接沉管水中段与陆地段之间的主体段,基坑开挖深度深,且位于滨海相软弱土区内临河施工,需经历管段出坞、支撑拆除、钢围堰施工以及最终接头施工、支撑再次安装等过程。通过对大型沉管隧道连接段主体结构关键技术研究,解决了在小基坑多道支撑下有限空间内,PC拉索、端钢壳、外包防水、端封门等工程部位施工难点,保证了主体结构施工质量和安全。Immersed method is adopted in construction of Haihe River Tunnel of Central Road in Binhai New Area,Tianjin.The connection section of the immersed tunnel is the main connection section for the immersed tube in the water and the land.Thus the foundation excavation is constructed in soft soil adjacent to river with large depth.Moreover the construction includes tube sections undocking,supports demolition and steel cofferdam construction,as well as the final joint construction and the supports re-installation.Key construction technology of main structure for connection segment in large immersed tunnel is researched to solve the difficulties of PC cables,end steel shell and end waterproof sealing doors in limit space of foundation excavation with several supports.The mentioned technology ensures construction quality and safety of the main structure.

关 键 词：隧道工程 沉管法 连接段 端钢壳 混凝土支撑 防水 

分 类 号：TU7[建筑科学—建筑技术科学] U455[建筑科学—桥梁与隧道工程]