关键词: 地铁工程, 狭窄空间, 复杂因素, 盖挖逆作法, 先隧后站法, 优化设计

Abstract:

The design and construction of Metro engineering are usually affected by buildings and traffic on the ground, underground pipelines, structures, construction space and geological conditions, etc. As a result, countermeasures are given as follows: 1) The large span noncolumn structure is combined with composite wall structure so as to meet the construction space requirements. 2) The cutandcover topdown method is adopted so as to guarantee the traffic on the ground and replacement of pipelines and improve the safety of foundation pit. 3) The construction schedules of some stations can be guaranteed by using cutandcover topdown method and construction scheme of tunnel first and station followed. Good effects have been achieved.

Key words: Metro project, narrow space, complex factors, cutandcover topdown method, tunnel first and station followed method, optimization design