Using HDD to cross an airfield [Cambodia]
With Horizontal Directional Drilling (HDD), the pipelines are laid in three stages. First of all, the HDD rig powers a drill bit mounted on a rotating drill rod. A pilot hole is drilled from the start towards the end point. The drilled hole is supported with a bentonite suspension, which conveys excavated material to a separation plant. In the second stage, the hole is reamed by withdrawing the drill rod; it is then gradually expanded until it reaches the required diameter. Finally, the prefabricated pipeline is connected to the drill string at the exit point and pulled into the tunnel.
YOUR BENEFITS
- Requires little space
- Short set-up and construction times
- Low costs
- High degree of precision
- No groundwater conservation required
- Diameters 0.2 m –2.0m
- Lengths over 1,000 m possible
- No shaft required
- Pipes can be laid in curves
- Minimal environmental impact
