What Is Rotary Bored Piling?

2 November 2020

Why you might need a Rotary Bore Piling Rig...

Rotary bored piles can be and are often larger diameter than conventional CFA (continuous flight auger) piles. They can be used to support greater loads, drill through ground with obstructions and to penetrate ground, including rock, that is too hard to bore using the continuous flight auger method. Rotary Bore pile installation can also be used to create piles with a cut-off level beneath the platform level. The rotary bored technique enables the reinforcement to be added into the open bore rather than into the ready poured concrete, as in CFA, it has the advantage of allowing the cage to be inserted the full depth of the pile.

This method of piling and is advantageous when compared to CFA, as the diameter and depth possible is greater and a number of piles can be drilled in advance of concreting arriving on site.

Another advantage of rotary piling is that it is possible, with certain types of drilling machinery, that the base of the hole can be reamed out larger to increase the bearing area of the pile.

Bored Displacement Piles can also be carried out, a continuous displacement pile is a bored pile which displaces or compacts the soil into the surrounding soil through which it is constructed. It therefore creates almost no arisings ensuring that there is minimal spoil to remove from site which is especially advantageous on contaminated sites. This type of drilling can increase load carrying capacity compared with CFA piles of similar dimensions due to compaction of the soil during piling.

How Rotary Rigs work

Rotary bores drill to a designed depth, using an auger, drilling bucket or core barrels which support the pile through any unstable ground, and are reinforced with concrete once the required depth is reached

Rotary Bored Piling can offer higher power or torque than some CFA rigs and are able to overcome underground obstructions. Compared with other piling techniques LDP (Large Diameter Piling) can offer larger load capacities and be installed to greater depths.

The Advantages of Rotary Bored Piling

Rotary Bored Piling is a simple and efficient installation process.

With achievable depths up to 60m with correct casing and large tool diameters this means that very high capacity loads can be achieved.

Bore pile drilling is amenable to almost all ground conditions including rock drilling.

When using the rotary drilling technique, you cause minimal ground disturbance and vibration which reduces risk to adjacent structures and buildings.

There is the ability to construct sockets into underlying rock.

Rotary Bored Piles can be used to support any structure where the highest load carrying capacity is required.

Larger diameters are easily achievable and can extend to greater depths when compared with any other piling technique

With specialist expertise, professional piling companies have the ability to deliver large, complex and technically challenging projects.

With the different types of drilling tools available, including augers and buckets, casings and oscillators Rotary Bore piling can be used in almost any situation and it is possible to bore through hard strata, and any boulders or man-made obstructions which may prevent the use of CFA piling methods and also soft ground supported by temporary casing through to high grade very strong rock cored in to open-hole techniques.

Further Information:

Here at Sigma Plantfinder Limited we have for sale a vast selection of used  Rotary Bore Piling rigs, along with all other kinds of piling rigs like CFA Piling rigs, Mini Piling rigs, Hammer Piling rigs, Jet Grouting, Vibro and Sheet Piling rigs and Diaphragm Wall piling rigs.

Our selection of  Rotary Bore Piling rigs will ensure you can select the correct machine for the job, this will mean you can provide the most competitive quote for mini piles which fits the project and budget at hand.

Contact Sigma Plantfinder today to discuss your piling and drilling needs.

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