Construction Technology of Underpinning and Pre-supporting Pile Foundation of Special-shaped Slab Beam in Urban Interchange

Abstract

With the rapid development of China's urbanization process, the original transportation plan cannot fail to meet the needs of urban economic development, and the transformation and upgrading of the urban transportation system is imminent. Urban rail engineering has become the only way to solve traffic problems in major core cities. However, conflicts between subway shield tunnels and existing building foundations occur from time to time, especially when some important buildings and public facilities cannot be demolished, underpinning technology is required. This paper relies on the Shijiazhuang Metro Line 2# underpassing the urban overpass special-shaped slab beam construction and bridge project built in 1994, combined with the past pile foundation underpinning and current intelligent construction technology, in the multi-support prestressed concrete special-shaped slab beam substructure pile foundation Intelligent pre-supporting technology is adopted in the underpinning construction process, which solves the problem of synchronous control of multi-supporting special-shaped slab girder under complex environment, and ensures the safety of construction and bridge operation.