In order to comply with
The main contractor Sheehan Pipe Line Construction Company commissioned REM Directional Inc. with implementing the requisite crossings for the pipeline installation. So far, horizontal directional drilling or auger drilling technology have been used, based on the respective project requirements. For the crossing under the Highway 70 in
During the installation process, slurry tunneling with the Herrenknecht Direct Pipe machine, guaranteed the requisite precise pressure control of the tunnel face, preventing settlements or heave on the site surface. The Herrenknecht navigation system U.N.S. with gyro-compass and electronic hydro level keeps the machine on the specified three-dimensional curve with vertical and horizontal curve radii of 914 (3,000 ft) and 1,828 m (6,000 ft), respectively, for a safe and exact course. The Herrenknecht Pipe Thruster is anchored in the launch pit and thrusts the prefabricated pipe string that has been laid in advance. The average thrust force of 15 tons (max. 28 t) is transferred to the Direct Pipe machine ahead. Highway 70 was swiftly and safely underpassed using this award-winning (Iploca Award in 2009) method. Despite the three-dimensional curve, only three drilling days (single shift operation with 12 hours) were required for exact and safe installation of the 215-m (705-ft) pipe string. The Herrenknecht machine reached the target pit as early as Aug. 29, 2010.
After a total of five successful Direct Pipe projects in