Construction method for fast underground excavation of newly-built station by using existing station

The invention relates to a construction method for fast underground excavation of a newly-built station by using an existing station, and belongs to the technical field of subway station construction.The construction method comprises the following steps that S1, an optimal channel route is determined, and a newly-added channel is excavated to be connected with the existing station; s2, primary support of the newly-added channel; s3, a safety transverse channel is excavated, and the safety transverse channel enters a newly-built station elevated section for construction; s4, a newly-built station is excavated through a bench method; and S5, backfilling and closing the newly-added channel. The method has the effect of reducing the influence on the construction node and the construction period. 本申请涉及一种利用既有车站快速暗挖新建车站的施工方法，属于地铁车站施工的技术领域，其包括以下步骤：S1、确定最优通道路线，开挖新增通道以连接既有车站；S2、新增通道初期支护；S3、开挖安全横通道，安全横通道进新建车站挑高段施工；S4、台阶法开挖新建车站；S5、回填封闭新增通道，本申请具有降低对施工节点和工期影响的效果。