Horizontal Directional Drilling
Horizontal Directional Drilling (HDD) is a trenchless technique used to install pipes, ducts or cables that need to follow a straight or curved path.
The process involves creating an initial pilot borehole of interconnecting flexible rods. This hole can then be enlarged by pulling a larger diameter cutting head back along the path of the rods. Diameters between 60mm and 1,200mm are attainable.
The product pipe, duct or cable is installed by attaching it to the end of the rods and pulling it back towards the drilling rig as the rods are extracted. Spoil from the drilling process is removed in the form of slurry.
A.E. Yates has considerable expertise with directional drilling and our extensive range of HDD equipment has enabled us to meet the demands of a wide variety of pipe and cable laying projects. Our largest HDD rig has a pull back force of 70 tonnes and single-span boreholes of 500m can be achieved without the need for intermediate pits.
HDD Drilling Rigs
Wirth ADDS Powerbore 70-15 (x2)
+ Mud Mixing/ Recycling Unit.
Features 70 tonne pullback. This Rig can be fitted with a Mud Motor Drilling Head for Rock Drilling Capability and a Wire Line Guidance System for Long Bores where Walk Over Tracking is not possible such as river or runway crossings.
Vermeer D33x44 Navigator
+ Support Mud Mixing Vehicle.
This Rig can be fitted with the Vermeer RockFire Drilling Head for Rock Drilling Capability.
Astec 3238 (x2)
+ Support Mud Mixing Vehicles.
3800 ft-lb of torque and 32,000 lbs of pullback.
American Auger DD6
+ 10,000 litre mud mixing unit.
10,000ft-lb of torque and 60,000lbs of thrust and pullback. This rig can be fitted with a mud motor for rock drilling capability.
Vermeer D50x100A Navigator
+ Mud Mixing Unit.
10,000 ft-lb of Torque and 50,000 lbs of pullback force. This rig can be fitted with the Vermeer Rockfire drilling head for rock drilling capability.
