Abstract

Pilot Tube Microtunneling, also referred to as the pilot tube system of microtunneling, guided auger boring, or guided boring method, is a trenchless construction method that is capable of installing pipes to pinpoint line and grade accuracy throughout the length of the bore. Pilot tube microtunneling evolved as a combination of three other existing trenchless technologies namely microtunneling, horizontal direction drilling and auger boring. The technology originated in Japan and Europe, and was first introduced to the United States in 1995. Since then this methodology has seen increased utilization across North America particularity in municipal markets for the installation of gravity sewers. This paper presents the results of a survey questionnaire of 22 pilot tube microtunneling contractors across North America, representing a total of 450 projects completed between 2006 and 2010, to determine the current industry state of practice in North America. The questionnaire examined various topics including contractor profile and experience; equipment, methods, and pipe materials utilized; and issues pertaining to project planning and construction risks associated with the pilot tube method.

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