Gaz Métro successfully crossed multiple railway lines within the specified settlement tolerances imposed by Canadian National Railway in June 2016 with a 16-inch high pressure gas pipeline. To do this a significantly reduced ream size of only 19 inches was employed in the design with a specified reduction in the cuttings / fluid circulation. The intent of this methodology was to leave the majority of the cuttings in the bore and thereby reduce overall settlement. This was enabled by the very soft but sensitive clay soil conditions. Settlement was also an issue for a large diameter sewer line that was also crossed along with other utilities. The HDD contractor, Forages Nella Inc, of St-Henri Quebec, worked alongside the engineers to fine tune the methodology to ensure the success of the project. The project was successfully completed June 30, 2016. Only 3 hours were required for the install and pull forces were well below the maximum anticipated.
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机译：俄罗斯天然气公司（GazMétro）于2016年6月通过加拿大国家铁路公司（Nanadian National Railway）规定的规定沉降容限，成功横穿多条铁路线，并铺设了16英寸高压天然气管道。为此，在设计中采用了仅19英寸的显着减小的铰刀尺寸，并减少了切屑/流体循环。这种方法的目的是将大部分钻屑留在钻孔中，从而减少整体沉降。这是由于非常柔软但敏感的粘土条件而实现的。大直径下水道管线的沉降也是一个问题，下水道管线也与其他公用设施一起越过。 HDD承包商，魁北克省St-Henri的Forages Nella Inc，与工程师们一起对方法进行了微调，以确保该项目的成功。该项目于2016年6月30日成功完成。安装仅需3个小时，而拉力大大低于预期的最大值。
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