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Prairie Vista Sanitary Sewer Collection - Microtunneling an Open-cut Project

机译：Prairie Vista卫生下水道集合-微隧道露天矿

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Despite the advancements made in the last couple decades, one particular industry has yet tornfully embrace the benefits offered by trenchless technologies. The installation of gravityrnwastewater and stormwater systems has historically favored open-cut construction, in partrnbecause of traditional construction practices, but mostly due to the perceptions of the cost-benefitrnratio associated with trenchless methods.rnThe City of Altoona (Iowa) just became the exception. Though governed by budgetary and costrnmandates, they challenged Snyder & Associates, Inc. to consider an alternative to open-cut onrnthe Prairie Vista Sanitary Sewer Connection project. Nothing about the project mandated thatrntraditional methods wouldn’t be acceptable – the ground conditions were favorable and thernproject location was in rural Polk County – but a trenchless option was added as an alternative inrnthe bid documents.rnJ&K Contracting LLC from Ames (Iowa) was awarded the contract and began a feasibility studyrnto determine whether vacuum microtunneling (VMT) was a cost-effective alternative to open-cutrnon approximately 3300 feet (1005.8 meters) of 10” (250mm) sanitary sewer. Though thisrnchanged the pipe requirement to restrained-joint PVC, the benefits and costs associated with thernboring process proved to be advantageous. After discussions with the City, the engineers, andrnthe equipment supplier, J&K Contracting opted to minimize the excavation on the project byrnboring over 90% of the footage with VMT.
机译：尽管在过去的几十年中取得了进步，但一个特定的行业仍在痛苦地拥抱非开挖技术带来的好处。重力废水和雨水系统的安装在历史上一直偏爱露天开采，部分原因是传统的建筑实践，但主要是由于人们对与非开挖方法相关的成本效益的认识。阿尔托纳市（爱荷华州）刚刚成为例外。尽管受预算和成本授权的约束，但他们还是向Snyder＆Associates，Inc.提出了挑战，要求他们考虑采用替代方案来替代Prairie Vista卫生下水道连接项目。该项目并没有要求采用传统方法-地面条件良好，并且项目所在地位于波尔克县乡村-但是在招标文件中添加了无挖洞的选择作为替代。爱荷华州艾姆斯的J＆K Contracting LLC被授予该合同并开始了可行性研究，以确定真空微隧道（VMT）是否是一种经济有效的替代方法，它可以替代约3300英尺（1005.8米）的10英寸（250毫米）卫生排水管。尽管这将管子的要求改为了约束接缝的PVC，但与钻孔过程相关的收益和成本却被证明是有利的。与纽约市，工程师和设备供应商讨论后，J＆K Contracting选择通过使用VMT钻探90％以上的镜头来最大程度地减少项目的挖掘工作。

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