bored piles

The bored pile, also called a twist-drill pile, is a concrete pile constructed in the ground. Upon completion the concrete pile is at correct height with a reinforced head.

In particular in projects where vibrations and noise nuisance must be kept to a minimum, for example, in old town centres, near hospitals and electricity switch boxes, our bored piles make an ideal foundation system. Also, where we must drive though very solid ground and substrata.

With the piling operations, a hollow pile with a flap closing its bottom end is rotated into the ground to the correct pre-determined depth.

Subsequently, the hollow pile is filled with concrete and slowly drawn up without rotating it, whilst the hole fills evenly with concrete and the top of the pile is at surface level. The drilled-up soil up is removed with a mini excavator. Afterwards, the reinforcement is positioned. Pile

trimming is usually unnecessary with this system. The required the length and diameter of the pile can be adapted during the work.

For long bored piles reinforcement cage over the entire length of the pile is practically impossible, but this can be compensated for by a centre rod.

Bored piles are also excellent for use as tension piles. To this end, the pile needs to have its entire length equipped with a rod of 25 to 40 millimetres in diameter.

Bored piles made with concrete quality of C20/25 or C28/35 can bear vertical pile loads from 200 to a maximum of 2000 kilo Newton.

Our bored piles can also be excellently applied as earth-retaining partitions or pile walls by positioning the piles with very little intervening space or even at offsets. In addition, it is possible to work with these piles as props up to 4 to 1.

This foundation technique is not suitable for areas with over-pressured groundwater layers.