Abstract:

Nanluoguxiang Station of Line 8 of Beijing Metro is the first Metro station in Beijing from which two shield machines of the stacked tunnel tubes will launch. It is of great importance to minimize the influence of the launching of the upper shield on the intermediate slab of the Metro station and to ensure the normal horizontal material transportation for the boring of the lower shield. In the paper, it is proposed that vertical steel supports be adopted to replace the shaped steel supports so as to consolidate the intermediate slab of the Metro station. Stress verification is made for the proposed consolidation method, which proves that the proposed method is feasible. The intermediate slab is consolidated according to the proposed method and good result has been achieved. 

Key words: Beijing Metro, shield launching, intermediate slab, steel support, consolidation technology