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A Case History of Scour Impacted Pipelines in River Crossings Part II - Structural Repairs

机译：河流交叉口冲击管道的案例历史 - 结构维修

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Two major water supply pipelines, (48/42 and 51-inch [122/106 and 130 cm] diameter), owned by City of Everett, Washington, at five river and slough crossings (160 to 540 feet [50 to 165 m] wide) where parts of the pipelines had become exposed and unsupported because of scour. Two of the 51-inch [130 cm] diameter pipeline crossings required emergency repair. The underwater emergency repair consisted of repairing the damaged coating, driving steel piles alongside the sections of pipe that could be scoured, encasing the pipe in steel jackets at pile locations, bolting the jackets to the pipe and piles, and protecting the pipe by under-water tube steel fabricated screens and above-water rock-filled polyethylene mattresses. All investigation, scour analysis, design, procurement and fabrication were completed within 6 weeks. The mobilization of construction equipment on four barges at two sites and the emergency repairs at both crossings were performed simultaneously within 20 days to complete the construction prior to the impending flood season. This paper presents the structural evaluation, design of the emergency repairs, environmental aspects of the underwater construction, preparation of the construction documents, and the construction of the structural repairs to the pipeline.
机译：两个主要供水管道，（48/42和51英寸[122/106和130厘米]直径），由华盛顿州埃弗雷特市拥有，在五条河流和蜕皮的交叉口（160至540英尺[50至165米]宽）由于冲刷，管道的部分地暴露和不受支持。 51英寸[130cm]的两个直径管线交叉需要紧急修复。水下应急修复包括修复损坏的涂层，驱动钢桩沿着可能被冲洗的管道，包装在桩位置的管道上，将夹套拧到管道和桩上，并通过下保护管道。水管钢制造屏幕和上面水岩石填充聚乙烯床垫。在6周内完成所有调查，冲刷分析，设计，采购和制造。在两个站点的四个驳船上调动施工设备，在20天内同时进行两次交叉的紧急维修，以完成即将到来的汛期之前完成施工。本文介绍了结构评价，急诊修缮设计，水下建设的环境方面，施工文件的准备，以及对管道的结构维修的构建。

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