钢模台车在引江补汉输水隧洞出口渐变段中的应用

Application of Steel Formwork Trolley in the Outlet Gradient Transition Section of the Diversion Tunnel from the Yangtze River to the Han River

引江补汉输水隧洞出口渐变段顶拱受不良地质条件的影响,出现了出口边坡变形过大引起不收敛的问题。由于施工合同工期短,若采用传统支架平面模板的方式浇筑边顶拱,则该出口段施工工期不能达到合同要求。阐述了应用定制钢模台车成功完成该输水隧洞出口渐变段边顶拱混凝土衬砌施工的过程,较平面模板的施工方式节约工期7 d。采用钢制模板施工其混凝土,外观质量优于传统平面大模板衬砌渐变段边顶拱混凝土,不仅节约了施工成本,而且为后续隧洞掘进争取了时间,所取得的经验可供类似工程借鉴。

The top arch of the outlet gradient transition section of the diversion tunnel from the Yangtze River to the Han River is affected by adverse geological conditions,resulting in excessive settlement and non-convergence of the outlet slope of the tunnel.Due to the short period of the construction contract,if the traditional support plane template method is used to pour the edge and top arch,the construction period of the outlet section cannot meet the safety and schedule requirements of the contract.The article elaborates on the successful application of customized steel formwork trolley in the construction process of the concrete lining for the outlet gradient transition section of the diversion tunnel,which saves 7 days of construction time compared with the flat formwork.The appearance quality of the steel formwork concrete is better than that of the traditional flat large formwork lining for the transition section,which not only saves construction costs but also saves time for subsequent tunnel excavation.The experience and achievements obtained can be used as a reference for similar projects.