The ultimate process for installing steel casings and product pipes where grade and alignment are critical (e.g., in gravity drain sewer and water applications). Guided boring uses precision guiding equipment and guide tubes to precisely measure and adjust the path of the product pipe. Accuracy tolerances have been proven to be as tight as ¼” on the vertical axis, at distances well past 500’.
How does guided boring work?
The Guided Boring Machine (GBM) is placed in the launch pit, and set to grade by surveyors. The pilot tubes are guided into the ground using theodolites and
lasers, and pushed into the soil using powerful hydraulic rams. Once in place,
casing is attached to the pilot tubes, and the casing is augured into place while the tubes are removed, leaving a clean casing on line and grade
The advantages of guided boring
Guided boring is the only method for jobs in which grade is of utmost importance, and for ensuring accuracy on longer or more difficult shots. Its unobtrusive boring mechanism minimizes surface interference to keep busy routes and services open during subsurface construction.
- Guided boring installation across HWY 2 (Deerfoot Trail) from Seton Blvd to Cranston in Calgary, Alberta. 500 foot service line with a diameter of 48” was installed using guided boring tubes, and was then augured out to the design diameter. This project was particularly challenging due to the difficult sandy conditions which tested the durability of the machines during the 500’ length, under Calgary’s busiest road.