Optimization of Double Shield TBM Passing Through Station in Subway Tunnel Construction
For subway tunnel shield machine and TBM construction,two methods are usually used to pass through the station:one is to bore through the station and the other is to step through the station.The latter shall be constructed as concrete guide platform after the completion of main structure and base plate of the station.The completion of the main structure and base plate of the station is a necessary condition for the shield machine or TBM to pass through the station.However,due to the relatively substantial volumes of excavation support works and structural engineering at the station,the complex construction environment of the metro,the multitude of interfering factors,as well as the delay in the actual commencement of construction compared to the planned schedule resulting from reasons like land acquisition and demolition,the shield machine or TBM has been idle for an extensive period,awaiting the passage of the station and thereby affecting the overall project schedule.Taking Qingdao Metro Line 4 as the project background,the double shield TBM transit scheme is studied and optimized.By adopting the way of pulling down the middle slot,single guide platform for double TBMs passing through the station,the problem that the TBM can't pass through the station in time due to the delay of the station's construction period is solved;by adding the TBM construction shaft,the interference between the TBM driving and the station's construction after passing through the station is solved,the construction period is significantly shortened,the economic and social benefits are improved,which can be used for reference by similar projects.
subway tunneldouble shield TBMpassing through stationscheme optimizationpulling down the middle slotsingle guide platform for double TBMs passing through the station
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