关键词: 盾构接收, 无内衬竖井, 结构设计

Abstract: Due to the fact that the station cannot provide the shield receiving conditions on time, a temporary receiving shaft should be added to Shizitang StationJianshe Road Station Section on Nanning Metro Line 2. According to the conventional method, the shield can be received after the shaft lining structure is completed, which will cause problems such as long construction period, high construction cost and multiple construction procedures. Hence, in order to solve the abovementioned problems, a series of technologies, i.e. adopting enlarged and closepacked piles at the position of shield machine entering the receiving shaft, replacing the support or the outer pull anchor by horizontal ring beam, using the glass fiber rib instead of the steel bar at the tunnel portal, using special sealing device for tunnel portal, flexible setting of the temporary sealing bottom, optimization of the tunneling parameters before shield receiving, and the precipitation, monitoring and other measures, are adopted. The shield machine can directly cut the pile into the shaft without the need to apply the shaft lining structure, and the shield receiving has been realized safely and quickly, which can provide guarantee for the completion of the project.

Key words: shield receiving, shaft without lining, structural design