With simultaneous casing drilling DTH found its way to construction industry, which had a need to find a method to get the casings into complex ground conditions. DTH drilling suits especially well for drilling foundation piles in ground conditions with hard material likes stones, boulders and different types of bed rock. Due to high productivity DTH is also gaining popularity in off shore foundation building.
There are several different types of piles that can be drilled with DTH overburden drilling system:
- End bearing piles with left in casing
- Friction piles with retrieved casings
- Vertical and battered piles
- From small diameter micro piles up to 1,5 meter casings!