Construction Techniques of Working Shaft for Ultra-shallow-underground-pipe Jacking

Abstract:

In construction of pipe jacking, the wall of working shaft and soil body behind the sidewall offers enormous supporting force to a lift. But for ultra-shallow-underground-pipe jacking, the limited discrepancy between ground level and the bottom level of the shaft produces the difficulty for the designing and construction. The paper detailed construction technology of working shaft for pipe jacking in ultra-shallow shaft with a practical engineering, including some key points of pre-grouting, ring beam construction and top-down construction methods.