Construction Technology of Longitudinal Continuous Concrete Pouring for the Second Lining Arch Roof of Tunnel
The traditional construction technology of tunnel secondary lining is influenced by factors such as pouring method,site management and actual conditions,which can easily lead to the failure of concrete filling in the arch space when the tunnel secondary lining goes through the roof,then the two-liner structure is formed,and the concrete is loose,the cavity behind the lining is empty and the thickness of the lining structure is insufficient.In order to solve the problems existing in the traditional construction technology of tunnel secondary lining,based on Laobishan Tunnel project,this paper puts forward the longitudinal continuous concrete pouring technology of tunnel secondary lining vault and the overall design of equipment,which is simple to operate,safe and reliable,can greatly improve the construction quality of the second-lined vault concrete,and completely solve the quality defects and red line problems of the second-lined vault concrete in tunnel engineering.The new technology has been widely applied in the construction of Chengdu-Kunming Railway tunnel and has gained high social evaluation.
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