ABSTRACT
The project's surrounding environment and urban planning restrict Fuzhou's 3.2 m inner diameter power jacking pipe pass under the existing two-way six-lane road. Because the jacking pipe encounters slightly weathered granite boulders when excavating in the residual soil layer. It is impossible to mine, and building a shaft from the ground is necessary to remove obstacles. To solve the specific engineering problems, based on the size and shape of the boulders obtained from the supplementary geological survey and comprehensively taking advantage of the characteristics of the circular well structure and the small footprint of the rectangular well, an elliptical inverse shaft was proposed. The area of the post and its enclosure have been reduced from the conventional 3-lane to 2-lane, which can ease the impact on ground traffic while removing obstacles smoothly. The article introduces the design and construction scheme of the shaft in detail and provides a reference for the construction of similar projects.
