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首页> 外文会议>Annual technical conference of the North American Society for Trenchless Technology 2008 >FOSSIL CREEK DRAINAGE TUNNELS - CASE HISTORY
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FOSSIL CREEK DRAINAGE TUNNELS - CASE HISTORY

机译：化石爬行排水隧道-案例历史

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Twin 10 ft diameter drainage tunnels through an existing railroad embankment were required to alleviate the potential for flooding at 105 homes during a 100-year flood at Fossil Creek. The railroad embankment was constructed "over" an existing wood trestle by end dumping soil fill from the track. Tunneling challenges included the trestle bridge wood elements, loose to medium embankment fill and very loose to loose, saturated silt and silty sand a few feet below the embankment, and potential mixed-face of claystone bedrock and soil. Following subsurface explorations, tunnel invert elevations were raised to minimize the risk of mixed face and flowing ground conditions. In addition two, one-foot diameter steel pipes backfilled with concrete were constructed immediately below the "five and seven o'clock" positions of the 10 foot diameter drainage pipes using the Guided Boring Method (GBM) of construction. These steel pipes were designed to perform as "guide rails" for the drainage pipe. Finaly, geotechnical instrumentation of the railroad embankment was used to monitor for embankment and track settlement during construciton. The Contractor was pre-selected by the City of Fort Collins to provide a negotiated price contract for the work. The Contractor participated in the project during both the initial planning and then through the final design phases of the project and provided invaluable input on preferred construction means and methods. The GBM pipe "rails" were suggested by the Contractor as a means to mitigate potential "soft bottom" conditions during the main tunnel drives. An open shield with hydraulic digger was used with breasting tables and provisions to fully breast the face overnight between each single 10-hour shift per day.
机译：在化石溪（Fossil Creek）历时100年的洪水中，需要一条双直径10英尺的排水隧道穿过现有的铁路路堤，以减轻105户房屋的洪水泛滥的可能性。铁路路堤是通过将土壤填充物从轨道上倾倒而在“现有”木栈桥上方“建造”的。开挖的挑战包括栈桥木元素，松散至中等的路堤填充以及非常松散至松散，饱和的粉砂和粉砂在路堤下方几英尺处，以及潜在的粘土岩基岩和土壤混合面。在进行地下勘探之后，提高了隧道的反演标高，以最大程度地减少混合面和流动地面条件的风险。另外，使用导孔法（GBM），在10英尺直径排水管的“五点钟和七点钟”位置的正下方建造了两根直径1英尺的回填混凝土钢管。这些钢管被设计成用作排水管的“导轨”。最后，在施工期间，铁路路堤的岩土工程仪器被用于监测路堤并跟踪沉降。柯林斯堡市已预先选择了承包商，以提供谈判的工程价格合同。承包商在最初的计划中，然后在项目的最终设计阶段都参与了该项目，并就首选的施工方法和方法提供了宝贵的意见。承包商建议使用GBM管道“钢轨”，以减轻主隧道掘进过程中潜在的“软底”状况。将带液压挖掘机的敞开式防护罩与排奶台配合使用，并规定每天每天每10个小时轮班之间要整夜整夜洗脸。

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