2nd April 2012
GRCL are about to commence a challenging horizontal directional drill crossing under the River Ouse at Selby to carry ducting for telecommunication, signalling and power cables. Selby Swing Bridge is located on the Leeds to Hull Line at 30m 70ch which interfaces with Selby Signal Box. The project consists of the renewal of the Swing Bridge Cabin Signalling Interlocking onto a new Interlocking Building incorporating the Lineside equipment from Locations 128, 129, 130 & 131.
Due to the presence of buildings and steel infrastructure an allowance has been made for drilling the pilot bore using advanced and accurate Gyroscope steering technology. This technology is not affected by magnetic interference and removes the need for setting out wire grids along the drilling route.
30m deep boreholes were undertaken to establish the soil formation including both drift (cohesive) and solid (bedrock) geology.
It is proposed to install 3 number 180mm medium density polyethylene welded ducts 6m below the bed of the river Ouse and just 0.5m above the sandstone rock head for a distance 310m from entry to exit.
To reduce the quantity of drilling mud to be finally disposed, the drilled cuttings will be pumped through a recycling plant positioned adjacent to the slurry pits which will remove the cuttings, this will allow the mud to be re used down the drill hole.
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