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首页> 外文会议>North American Society for Trenchless Technology (NASTT) no-dig show >Design/Build Considerations for a Tunnel Project in Saskatoon
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Design/Build Considerations for a Tunnel Project in Saskatoon

机译：萨斯卡通隧道项目的设计/建造注意事项

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摘要

The City of Saskatoon (City) has a population of about 240,000 and is currently undergoing significant growth. Itrnhas initiated a development process that, when complete, is planned to include eight new neighbourhoods in an arearnknown as the East Sector. This area consists of approximately 2,533 hectares (6260 acres) of land which willrnaccommodate another 82,000 people. The McOrmond Drive Sanitary and Storm Sewer Trunks project is beingrncompleted by the City to provide future wastewater and stormwater servicing for the East Sector development.rnThe total length of each trunk sewer is approximately 1,500 meters (~5,000 feet), with almost parallel alignmentsrnbelow a major arterial roadway with existing residential development on both sides. The diameter of the storm sewerrntrunk is 2,400 millimeters (~8 feet), and the diameter of the sanitary sewer trunk is 1,200 millimeters (~4 feet). Therndepth of the trunk sewers is approximately 13.5 meters (~44 feet) below ground surface. Due to the depth, and thernroadway above, an open trench method of construction was disallowed as the extensive surface disruption from thisrnmethod would have resulted in severe disruption to the travelling public and the nearby residential neighbourhoods.rnConsequently, the decision was made to install these services using tunneling methods.rnThe City reviewed the various procurement models for this tunnel project and selected a Design/Build model asrnoffering best value to the City in terms of balancing cost and risk.rnTunneling inherently involves risk. This usually translates to additional cost, particularly with a Design/Buildrnapproach, unless the risk is allocated fairly between the Owner and the Contractor. An essential part of this riskrnallocation is for the Owner to provide a Geotechnical Baseline Report that sets out the baseline conditions for thernContractor to price the work.rnThis paper will provide details of the overall procurement process, firstly of the Owner’s Engineer selection, andrnsecondly the Design/Build contractor prequalification and subsequent competitive bidding process, from thernperspective of the City and its Owner’s Engineer and provide some of the lessons learned with this process.
机译：萨斯卡通市（市）的人口大约为240,000，目前正在显着增长。 Itrnhas发起了一项开发过程，该过程完成后，计划在一个称为“东部地区”的区域中包括八个新社区。该地区约有2,533公顷（6260英亩）的土地，可容纳另外82,000人。纽约市正在完成McOrmond Drive卫生和雨水管道的干线项目，为东部地区的发展提供未来的废水和雨水服务。每个雨水管道的总长度约为1,500米（约5,000英尺），几乎平行的对中线主要在下面两侧都有现有住宅开发的干道。雨水管道的直径为2400毫米（〜8英尺），而污水管道的直径为1200毫米（〜4英尺）。干渠下水道的深度在地面以下约13.5米（〜44英尺）。由于深度和上方的人行道，不允许采用明渠施工方法，因为这种方法对地面造成的广泛破坏会严重损害行进中的公众和附近的居民区。因此，决定安装这些服务。纽约市审查了该隧道项目的各种采购模型，并选择了一种设计/建造模型，以平衡成本和风险，从而为纽约市带来了最佳价值。rn隧道技术固有地涉及风险。这通常会转化为额外的成本，尤其是在采用设计/建造方法时，除非风险在所有者和承包商之间公平分配。风险分配的重要部分是为所有者提供岩土工程基线报告，该报告列出了承包商对作品进行定价的基准条件。本文将提供总体采购流程的详细信息，首先是所有者工程师的选择，其次是设计从市政府及其业主工程师的角度，建立承包商的资格预审以及随后的竞争性招标过程，并提供一些从该过程中学到的经验教训。

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