Cased Piles

Cased piles are concrete bearing piles with a permanent steel tubular casing.  They are suitable for the foundations of buildings, bridges and any other structure or which pre-cast or cast-in-place concrete piles are used.  Cased piles are formed by fitting the bottom end of the casing with a flat plate shoe and then driving it into the ground to the necessary penetration, using a special cylindrical drop hammer operating inside the casing and striking on a plug of earth-dry concrete deposited at the base.  The pile is then completed by filling the casing with concrete.  The casing is not withdrawn and remains permanently in the ground to form a shutter which protects the concrete whilst it is setting and hardening.  No steel reinforcement is necessary. With the exception of short bonding bars to connect the concrete filling to the pile cap.

Every pile in a foundation should be proportioned, as far as possible, so that it can carry its load safely, yet without waste.  Pile sections and the weight of the internal hammer can be chosen to provide the maximum load capacity within the permissible stress of the materials used.

Cased piles are able to fulfil all these conditions.  Pile size can be varied to provide the most economical solution for different pile loads, and piles can be extended without the need for expensive jointing systems.  These advantages put Cased Piles into a new class by themselves.

T1000 drop hammer rig. Installing steel case piles 220dia. 3 rigs used on this development to accellerate program.