富水砂卵石地层大型沉管隧道轴线干坞坞口施工技术

Construction Technology of Axis Dry-dock of Large Immersed Tunnel in Sand Gravel Layer

基于襄阳内河沉管隧道项目,结合工程富水砂卵石地质条件,通过方案比选,确定干坞选型及坞口结构形式。针对干坞坞口处锁口钢管桩施工技术展开研究,解决大直径钢管桩预制、吊装及与格型地下连续墙连接等问题,给出了精度控制及纠偏措施,解决锁口钢管桩防绕流问题。

Based on construction of Xiangyang inland immersed tunnel, the structural form of dry dock and dock head is determined through the scheme comparison and selection according to the sand gravel layer. According to the construction technology of the locking steel pipe piles at the dock head, the problems of prefabrication, hoisting and connection with the lattice diaphragm wall of the large-diameter steel pipe piles are solved. The precision control and rectification measures are given and also the prevention of flow around in the locking steel pipe piles is solved.