Another piling method that is commonly used across the UK, especially on larger projects, is that of rotary bored piling. RBP uses a machine with specifically designed drilling tools, buckets and grabs which withdraws ground with each turn of the flight. The auger is bored into the ground, withdrawn and the spoil removed until the designated depth is reached.
These types of piles are known as non-displacement piles and are bored with a temporary recoverable steel casing which is used to stabilise the soil.
The piles are cast in place as once the cylindrical holes have been augured the concrete s poured directly into the chasm and left to set.
Advantages
RBP is another piling method that creates minimal vibration, which makes it perfect for areas that require a reduction in vibration and noise pollution. Compared to precast solutions RBP machinery also produces reduced noise levels.
RBP is also beneficial if obstacles are going to pose difficulties. It is also more suitable for tension loads at stability elements depending on the ability to install cage prior to concrete drying out.
Disadvantages
Tests must be done before augering commences to avoid the removal of potentially contaminated soil from being excavated.
Some chiselling may be required through any buried obstructions. In this case, considerable noise and vibrations would be caused, cancelling out the benefit of the RBP in the first place.
RBP is unfortunately, one of the slowest piling methods, with an average work time of around 8 weeks. With such a slow process, the cost of the project will also begin to rise. With longer work times a project is also opened up to extended noise exposure times.
Any projects that require piling in sandy/granular soil beneath the water level will require driven steel casings which once again leads to additional noise and vibration pollution.
Get in touch with the Rhino Piling team today for more information on piling in Manchester and the surrounding areas.
