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Los Angeles tunnels are expanded with help of TBM monitring system

机译:借助TBM监控系统扩展洛杉矶隧道

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During the last 20 years, more than 80 km (50 miles) of tunnels have been constructed in the Los An-geles, CA area.Recent projects include The East Cen-tral Interceptor Sewer (ECIS), completed in 2004. It spans more than 18 km (11 miles). The Northeast Interceptor Sewer (NEIS), completed in 2005, spans 11 km (7 miles). And the 2-km (1.3-mile) Metro-politan Transportation Authority's Gold Line Eastside Extension (MCGLEE) was completed in 2006.All of the tunnel routes lay beneath heavily populated urban environments so minimizing ground surface settlement was critical to the success of the projects. Pre-vious tunneling efforts in the Los Angeles area using open shield methods resulted in significant settlement that damaged roads, utilities, buildings and other structures. Earth pressure balance (EPB), or slurry machines, were specified for these projects to reduce subsidence risk. The contractors chose EPB tun-nel boring machines (TBM) for the work. The closed and pressured face of the EPB TBM reduces loss of ground at the tunnel face and, when the machines are used in com-bination with gasketed pre-cast tunnel liners and backfill grout behind the installed segments, losses from over-cut of the excavated surface are also reduced.
机译:在过去的20年中,在加利福尼亚州的洛斯安格莱斯地区建造了80公里(50英里)以上的隧道。最近的项目包括2004年完成的东中央拦截器下水道(ECIS)。超过18公里(11英里)。东北拦截器下水道(NEIS)于2005年完工,跨度11公里(7英里)。 2公里(1.3英里)的大都会交通管理局的金线东边延伸线(MCGLEE)于2006年完工。所有隧道路线均位于人口稠密的城市环境下,因此,最大限度地减少地面沉降对成功实现地铁至关重要项目。之前在洛杉矶地区使用开放式盾构法进行的隧道作业导致大量沉降,破坏了道路,公用事业,建筑物和其他结构。为这些项目指定了土压力平衡(EPB)或泥浆机,以降低沉降风险。承包商选择了EPB隧道掘进机(TBM)进行此项工作。 EPB TBM的封闭和受压面减少了隧道工作面的地面损失,并且当将机器与密封的预制隧道衬砌和已安装段后面的回填浆浆结合使用时,由于过分割破而造成的损失开挖面也减少了。

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