Drill bar/micropiles are a high performance, high capacity self-drilling deep foundation solution typically between 5-12 inches in dia which can extend to depths of 50 metres and transfer structural loads into the ground. The piles consist of high-strength steel casing, rebar and grout.
WHAT THEY’RE USED FOR
The drill bar system is also known as micropiles, the system can be installed in restricted access areas or within close proximity of buildings. Suitable in most ground conditions including rock and are often installed within the commercial, infrastructure and rail sectors.
Drill bar systems may be required in conditions such as: stabilisation, to minimise settlements, underpinning of existing foundations, tunnels, basements as well as highway and bridge works.
Micro piles are hollow bar piles with a hole through the centre varying in size from 40/200mm diameter to 103/51mm diameter, which allows boring and injection grouting to place simultaneously.
The pile is drilled into the ground with a suitable drill bit which is threaded to the first section of the hollow bar. The reinforcement bar is connected directly to the rotary percussive hammer on the drill rig by means of a swivel flushing head, allowing simultaneous drilling and grout flushing. Once design depths have been reached the pile is cast with full-strength grout.
WHY USE Drill Bar?
- The system is fast, simple and flexible
- Can be installed in any type of ground condition, particularly unstable soils
- Unaffected by changing soil conditions
- Perfect for structural repairs and underpinning
- Easily installed in confined spaces and limited access
- Ability to accommodate high load conditions
- Minimal vibrations and noise pollution
- Minimum site preparation
- Installed by RB in-house small and lightweight mini piling equipment
- Does not require temporary casing
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