Where piling is selected as the most suitable method for transferring building loads to in-situ soils, we have access to any of the following methods:
Continous Flight Auger (CFA) Piles
An all-purpose application capable of high outputs installing pile diameters between 250mm-600mm.
CFA piles are speedily installed and can cater for a variety of ground conditions, typically used where soils are described as clays, gravels, sands, silts and low grade rocks. They are cost-effective and can accommodate large working loads, depending upon the ground conditions into which they are installed.
Standard reinforcement details are used where appropriate which will comprise single centrally positioned reinforcing bars or reinforcement cages as required to suit horizontal or bending moment loadings.
Continuous flight auger piles are constructed by auguring into the ground to the required depth as specified by our engineers. Once the required depth is reached the auger starts to withdrawn from the pile position whilst pumping concrete under pressure through the hollow stem auger filling the void created. This method generates pile arising’s, so requires piling attendance. Reinforcement is installed into the pile once the pile is filled with concrete.
- Smaller pile diameters, eg; 300mm diameter, can be installed using light weight rigs, replacing the need for engineered piling mats.
- High productions can be generated, therefore reducing construction time.
- This systems generates little noise and vibration, making this quietest form of piling.
Steel Cased Driven Piles
This method is suited to sandy, gravelly soils. Typically for light weight housing developments 220 & 273mm diameter piles are used.
By using light weight rigs (less than 15T) to bottom drive the pile, usually it is not necessary to have an engineered piling mat. Therefore, significant savings in piling mat construction costs can be achieved.
These piles are bottom driven to ‘set’ or length as specified by our engineers. A steel cased starter is used with a dry plug to act as leader which is driven into the pile location with the use of a drop weight driving the bottom of the pile. Where additional sections are required we weld further sections onto the lead creating a continuous cased pile which ensures that no spoil enters the pile. The internal void can subsequently be filled with concrete or grout if required and reinforcement incorporated for connection into the raft foundation.
- Lightweight machines delivered using 7.5T vehicle’s
- Usually, no pile spoil generated
- No pile attendance required
- Inexpensive to mobilise
Site Setting Out & Supervision
We pride ourselves in driving piles accurately to close tolerances.
We do this by using the state of the art setting out equipment and very experienced pile driving crews.