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首页> 外文会议>Pipelines Conference >Crossing the Red: Managing Construction Changes on a Challenging 1200 mm Microtunnelling River Crossing in Winnipeg, Manitoba, Canada
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Crossing the Red: Managing Construction Changes on a Challenging 1200 mm Microtunnelling River Crossing in Winnipeg, Manitoba, Canada

机译：越过红色：管理施工变化在加拿大曼尼托巴省曼尼托巴省温尼伯的挑战1200毫米Microtunnelling河流上

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The Northeast Interceptor services approximately 2,300 ha (5,685 acres) of land in the northeast quadrant of the City of Winnipeg (Manitoba, Canada). The 1,800 mm (72") Interceptor crosses the Red River using a multiple-barrel inverted steel siphon configuration prior to it's final leg before reaching the City's largest wastewater treatment plant. The original siphon crossing, built in 1971, was at capacity during large wet weather events and required additional capacity to meet development plans and reduce upstream basement flooding risk. Thus, plans were developed to install an additional siphon. The size and construction methodology for the river crossing evolved through both the design and construction of the project. Originally starting life as a 600 mm (24") horizontal directional drill crossing, system hydraulic requirements dictated the installation of a larger 900 to 1200 mm (36" to 48") crossing to meet the desired design objectives. Due to the geotechnical, geometric, and surface use constraints, a 900 mm (36") microtunnelled crossing was tendered. To facilitate microtunnelling through underlying limestone bedrock in an area where external access is extremely limited, the contractor (Ward and Burke Microtunnelling) opted to install a single pass 1200 mm (48") siphon, increasing the capacity of the new crossing. Further changes to the project were proposed by the contractor and to an extent accepted by the project team. They included a vertically curved microtunnelling drive, eliminating the need to construct shafts within the underlying limestone aquifer, changes to the chamber designs to suit their preferred construction methods, and an alternative connection configuration to reduce tie-in risks. The challenge, as with any contractor driven design change, is to primarily ensure the original design intent and functionality of the project is not compromised. Secondarily, where construction risks have been shifted to other portions of the work, one must ensure they are of an acceptable magnitude and/or have been sufficiently mitigated. While this paper discusses the project as a whole, it primarily focuses on the evolution of the crossing design from inception to completion of construction. Managing design changes during construction is a critical component to any large capital project. This paper details AECOM's efforts to manage proposed changes during construction, complete with a lessons learned and recommendations for future complex tunneling projects.
机译：东北拦截服务约2,300公顷（5,685英亩）在温尼伯市东北象限的土地（加拿大曼尼托巴省）。 1,800毫米（72“）拦截器在到达城市最大的废水处理厂之前使用多桶倒钢虹吸管配置使用多桶倒钢虹吸管配置。原始的Siphon横穿1971年建于1971年，在大型潮湿期间以容量为容量。天气事件和所需的额外能力满足开发计划，减少上游地下室洪水风险。因此，开发了计划来安装额外的虹吸管。通过项目的设计和建设来发展河流的尺寸和施工方法。最初开始寿命为600毫米（24英寸“）水平方向钻横梁，系统液压要求决定安装较大的900至1200毫米（36”至48“）交叉以满足所需的设计目标。由于岩土工程，几何和表面使用约束，嫩发900毫米（36“）的微量不当交叉。为了便于在外部进入极限的区域中通过底层石灰岩基岩进行微调，承包商（病房和伯克Microtunnelling）选择了安装单通机1200 mm（48“）虹吸，增加了新交叉的容量。承包商提出了对项目的进一步变更，并在项目团队接受的范围内提出。它们包括垂直弯曲的Microtunnelling驱动器，消除了在底层石灰岩含水层内构造轴的需要，腔室设计改变以适应其优选的施工方法，以及可减少绞合风险的替代连接配置。与任何承包商驱动的设计变化一样，挑战是主要确保项目的原始设计意图和功能并未受到损害。其次，如果建造风险转移到工作的其他部分，必须确保它们具有可接受的幅度和/或已被充分减轻。虽然本文讨论了整个项目，但它主要侧重于交叉设计的演变从成立到建设完成。在施工期间管理设计更改是任何大型资本项目的关键组成部分。本文详述了AECOM在建设期间管理建议变更的努力，凭借验证的经验教训和未来复杂隧道项目的建议。

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