液压升降台车在特大断面隧洞施工中的应用

Application of Hydraulic Lifting Platform Truck in Construction of Extra-large Section Tunnels

特大断面引水隧洞施工时,采用分层开挖,由于不同围岩类别开挖尺寸不同,混凝土衬砌方式也不同。同时,隧洞轴线高程不在同一条线上,不同围岩类别开挖时,开挖台车往往只能满足一两种围岩开挖高度要求。经过现场改进优化后,升级为液压升降台车,就能适应各种围岩开挖高度,因而缩短开挖支护时间,增加工作效率,降低施工成本。

During the construction of extra-large cross-section headrace tunnel,the excavation in layers is adopted.Due to different surrounding rock types,the excavation dimensions and the concrete lining methods are different.At the same time,the tunnel axis elevations are not on the same line,and for different surrounding rock types,the excavation truck can only meet the requirements of one or two types of surrounding rock excavation heights.After on-site improvement and optimization,it is upgraded to a hydraulic lifting truck,which can adapt to various surrounding rock excavation heights,shortening excavation and support time,increasing work efficiency and reducing construction costs.