Forepoling ring-bit systems (also known as tube umbrella systems) are designed to be drilled with a top hammer or DTH in an umbrella shape, as secondary support in a tunnel roof, allowing weak ground or overburden to be strengthened by grouting through the casing and grouting valves into the ground.
- Forepoling or tube umbrella
- Micro piling
- Fibre glass face stabilisation
- PVC foundations