Rotary Piling
Rotary Bored Piles are used for large commercial and industrial developments, public buildings and transport infrastructure projects. As one of the UK's largest contractors in this field, BBGE has developed specialist expertise in delivering large, complex and technically challenging projects.
Basic Technique
An auger is used to excavate the earth, whilst a steel sleeve is inserted to maintain the bore through the top layers of unstable ground. A steel cage or pattern of reinforcing rods is introduced into the bore before the concrete is poured. The steel sleeve is later withdrawn.
Oscillator Piles
Where minimum disturbance is critical (e.g. close to an existing building or railway line), an oscillator can be used to install the steel casing with great precision.
Top Down Construction
Foundation piles can be installed from ground level together with the supporting columns for basement floors. By also pre-installing retaining walls, as the building goes up, the basement levels can be excavated simultaneously. This significantly reduces the overall build cycle.
Underreams
In stable soils the diameter of the pile can be extended up to 6,300mm at the base forming an inverted cone, which delivers a very high load-bearing capacity.
Drilling Fluids
Where unstable ground exists at greater depths, a vinyl polymer, or bentonite drilling fluid is introduced to support the bore during excavation and before the concrete is poured.
Strengths
- Accommodates large loads
- Wide variety of sizes - up to 3m diameter
- Large depths possible - up to 70m
- Suitable for all soil types, including rock
- High levels of accuracy
