北京地铁8号线南锣鼓巷站上下重叠隧道上线盾构始发中板加固技术

Consolidation of Intermediate Slab of Metro Station to Ensure Successful Construction of Stacked Tunnel:Case Study on Nanluoguxiang Station of Line 8 of Beijing Metro

北京地铁8号线南锣鼓巷站为北京首座上下线隧道盾构共用同一个盾构井始发的车站。如何减小上线盾构始发期间盾构对车站中板结构的影响及确保下线盾构施工的正常水平运输,是影响工程成败的关键因素。通过方案比选,提出采用竖向钢支撑代替型钢支撑对后浇中板进行加固。对建议方案进行受力检算,显示方案满足相关要求。方案实施后,达到预期目的,取得了良好的经济效益和社会效益。

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.