Technology of Subgrade Structure Replacement in Railway Tunnels Based on Temporary Steel Cushion Beam Supporting Structure and Its Application
The subgrade structure of railway tunnels may suffer from damage,settlement or uplift during long-term operation,which can seriously endanger operational safety.This posed new demands for the safe and efficient reconstruction of the subgrade structure.This paper fully considered the applicability and construction convenience of supporting technology,optimized existing supporting structures and proposed a steel cushion beam supporting structure suitable for railway transportation characteristics and tunnel construction environment.It analyzed the technical characteristics of full width,segmentation and slot jumping dismantling of tunnel foundation structures,then formed a railway tunnel foundation replacement and renovation technology scheme based on temporary supporting structures of steel cushion beams and replacement processes suitable for different types of track beds.Combining with a case application of the subgrade structure replacement and renovation project of an existing passenger dedicated tunnel to verify its technical effectiveness.The results show that the steel cushion beam subgrade structure replacement and renovation technology is suitable for complex tunnel environments with short skylights and small spaces.It has advantages such as flexible structure,convenient construction and adaptability to multiple working conditions.Therefore,the technical application effect is good,and it can provide reference for similar engineering replacement and renovation.
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