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Where the bearing capacity of the upper soil is poor or imposed vertical loads are high, concrete pile foundations are required.

There are two main types of concrete pile; end bearing piles, where the pile acts as a column carrying the load down to the bearing strata, and friction piles where the load is gradually transferred along the length of the pile.

Ivor King offer a range of Bored and CFA piling services that integrate with our sheet piling solutions.

Bored Piling

Our bored cast in-situ solution involves boring a circular hole into the ground, installing steel reinforcement cagesĀ and filling the borehole with concrete to form a pile. Boring is carried out to the designated depth by means of either a crane mounted or track mounted hydraulic drilling rig.

Apart from building foundations, the bored piling method is also used to form Contiguous and Secant bored pile walls for earth retention systems. A contiguous bored pile wall is formed by installing closely spaced bored piles, with a gap between adjacent piles of typically 75 to 150mm. A Secant pile wall is formed by installing overlapping bored piles. Secant piles are usually adopted where there are particular concerns about ground water.

Key Benefits & Advantages of Bored Piling

  • Piles of variable lengths can be extended through soft compressible or swelling soils, into suitable bearing material
  • Piles can be extended to depths below frost penetration and seasonal moisture variation
  • Large excavations and subsequent backfill are minimised
  • Less disruption to adjacent soil
  • Absence of vibration ensures no disturbance to adjacent piles or structures
  • Extremely high bearing capacity can be obtained by expanding the base of the shaft up to three times the shaft diameter, thus eliminating construction of caps over multiple pile groups
  • For many design situations, bored piles can offer higher capacities with potentially better economies than driven piles.

CFA Piling

Our Continuous Flight Auger (CFA) piling technique is an economical cast in-situ process which is suited for wet and granular soil conditions. A full length auger is plunged into the ground to the required depth. Having a hollow stem, once the auger has drilled to the required depth, concrete is pumped under pressure into the ground. A pre-fabricated reinforcement cage is forced into the concrete before setting occurs.

Temporary and permanent bored pile walls can be constructed using the CFA technique. They can be designed to function as a simple or propped cantilever and to support vertical loads.

Key Benefits & Advantages of CFA Piling

  • Well suited to soft and/or water bearing ground where deep casings or bentonite suspension would otherwise be required.
  • Quietest known form of piling
  • Virtually vibration free
  • All rigs are fully instrumented to provide performance reporting
  • Fast and economical
  • Limited headroom rigs are readily available for restricted site access / working environments
  • Application: diameters generally within the range of 450mm to 1200mm with maximum depths normally up to 29 metres. Used for bearing piles and contiguous interlocking and secant piled walls

Our Bored Piling & CFA Equipment & Rig Specification Guide

PVE 55DR

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MAIT CFA 24

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THW 4019D

2 x Woltman

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