When well known contractor Huber Leitungsbau was asked by client Stadtwerke St. Gallen to install twin 609mm steel pipes under three busy city centre roads there was no doubting their choice of technology. The firm had experienced success on multiple projects using the Bohrtec Front Steer system and saw this as a new opportunity to use the advanced guided auger boring technique. Front Steer was developed by Bohrtec and has been continuously improved with experience from many job sites in the past years. It was designed for use in harder ground where pilot rods struggle. "We have enabled applications in very dense strata with SPT values of over 35 and in moderately strong rock," explains Dr Heinz Plum, Bohrtec managing director. "Just like the conventional methods Front Steer uses a well proven guidance system consisting of a theodolite with a CCTV camera, monitor and LED target board," he says.
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机译：当客户Stadtwerke St. Gallen要求著名承包商Huber Leitungsbau要求在三条繁忙的城市道路下方安装609mm钢管时，毫无疑问，他们选择了哪种技术。该公司在使用Bohrtec Front Steer系统的多个项目中取得了成功，并将其视为使用先进的引导式螺旋钻技术的新机会。 Front Steer由Bohrtec开发，并在过去几年中从许多工作现场获得的经验不断改进。它设计用于在试验杆挣扎的较硬地面上使用。 Bohrtec总经理Heinz Plum博士解释说：“我们已经启用了SPT值超过35的非常致密地层和中等强度岩石中的应用。”他说：“就像传统方法一样，Front Steer使用的行之有效的制导系统由经纬仪，闭路电视摄像机，监视器和LED目标板组成。”
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