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PAWC Lake Scranton Finished Water Tunnel

机译：PAWC斯克兰顿湖成品水隧道

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This project involved installation of 5,000 ft of 42-in. steel water main via horizontal directional drilling (HDD) 300 ft beneath the East Mountain Section of the City of Scranton. This new transmission main provides an alternate, reliable means of supplying potable water to the greater Scranton area (over 50,000 homes and businesses) from Pennsylvania American Water's Scranton Area Water Treatment Plant. Prior to the completion of this project, the sole means of conveying finished water from the treatment plant to customers was through a one-mile long, 48-in. cast iron pipe located in a hand dug tunnel installed in 1909, which has limited valving and means of access for inspection and repairs. Michels Corp. completed the HDD portion of the project by using two 1 million-lb rigs, one staged on either side of the mountain, to complete the 12-in. pilot hole, and to complete the reaming up to the final 54-in. diameter bore hole; 42-in. coated steel pipe was then pulled back in seven 700-ft sections (welding and coating the sections together during pull back). By using HDD as the means of installation this project limited impact to homes and businesses in the area. Additionally, it allowed eliminated any potential pumping requirements to convey the plant's finished water over or around the Mountain, and also greatly reduce the length of pipeline required. Also, during drilling activities, a large amount of groundwater was encountered, which flowed consistently, at a high rate, from the lower borehole. Although this could have seriously compromised our ability to complete the project, the contractor, working with local officials, landowners, and PAWC's Scranton Wastewater Division, was able to effectively contain, treat and dispose of the groundwater until the drilling activities and pipe installation was complete.
机译：该项目涉及安装5,000英尺（42英寸）。斯克兰顿市东山区下方300英尺处通过水平定向钻井（HDD）进行钢制水主管。这种新的输水总管提供了一种备用的，可靠的方式，可以从宾夕法尼亚美国水务公司的斯克兰顿地区水处理厂向更大的斯克兰顿地区（超过50,000家和企业）供水。在该项目完成之前，将污水从处理厂输送到客户的唯一方法是通过一英里长的48英寸长管道。铸铁管位于1909年安装的手动挖掘隧道中，该阀门的阀门和检修渠道均有限。 Michels Corp.通过使用两台100万磅的钻机完成了该项目的HDD部分，其中一台钻在山的两边，以完成12英寸钻机。导向孔，并完成扩孔直至最终的54英寸。钻孔直径42英寸然后将涂有涂层的钢管分成七个700英尺的部分（在拉回过程中将这些部分焊接在一起并进行涂层）。通过使用HDD作为安装方式，该项目对该地区的家庭和企业的影响有限。此外，它消除了任何潜在的抽水要求，以将工厂的成品水输送到山上或山上，也大大减少了所需管线的长度。另外，在钻井活动中，遇到了大量地下水，这些地下水始终以较高的速率从下钻孔连续流出。尽管这可能严重损害了我们完成该项目的能力，但承包商与当地官员，土地所有者和PAWC的斯克兰顿废水事业部合作，能够有效地封存，处理和处置地下水，直到钻探活动和管道安装完成为止。

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    《Trenchless Technology》 |2019年第10期|28-28|共1页
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