Pilekon Construction – Technical information.
The piles are either 152 or 165mm steel casings with a closed point driven to refusal or set using a pneumatic mole. The piles can have a friction component or an end bearing result and have typically a 150kN capacity.
In clay/shale type materials, the piles will reach refusal at around 35 to 50 SPTn values depending on the depth of the pile.
In Berea red soils we generally reach sufficient friction at around 6m-8m deep. We have carried out tests and comply with the SABS 1200F requirements. A modified Hiley formula also works for us.
Should higher loadings be required, the piles can be very effectively clustered to give the required strength.
Our underpin piles have a cantilevered pile cap design which connects the pile to the underside of the foundation. Foundations can be jacked; however we don’t encourage this.
The system is ideally suited to confined spaces as we can work with as low as 2.2m of head room and the equipment can be carried through a normal doorway.
One of the few limitations of the system is where you have extremely deep, active clay i.e. more than 6m and no hard layer below, the friction overcomes the power of the machine; however with the change of season the piles will move. There are ways that we can minimize this. Another limitation is sandstone which is extremely difficult to displace and even a thin layer of sandstone presents a danger for us.
Should you have specific questions please contact us.