Research&Application of Technology for Relocating Large Diameter Deep Buried Underground Pipelines wth Special-Shaped Steel Casing Enclosure
With the rapid development of underground space,the depth of underground engineering construction is also increasing,and a large number of large-diameter deep-buried pipelines are faced with relocation problems in practical engineering.In order to safely and reliably relocate and cut large-diameter deep-buried underground pipelines,a study was conducted on the construction technology of a special-shaped steel casing structure for underground pipeline relocation;specific analysis was made from the aspects of the inner diameter and tongue-and-groove dimensions of the special-shaped steel casing,wall thickness,subsidence excitation force,MJS foundation reinforcement at the bottom of the pit,and positioning of the boundary of the underground pipeline route.In the Yinzhou Avenue Utility Tunnel Project in Ningbo,this construction technology was applied to successfully relocate a DN1600 raw water pipe that crosses the shield axis.Through engineering practice,it was verified that this technology is suitable for the relocation of large-diameter deep-buried underground pipelines in soft muddy soil areas,and has good economic and social benefits.
special-shaped steel pile casinglarge diameterdeep burialrelocationunderground pipelineMJS foundation reinforcement
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