Piling Works


Deep foundations in the form of piles are used to transmit pressures from a weaker soil (usually at or near the surface) to more competent soil at depth. Deep foundations may be used if

  • The bearing pressures recommended for the site are insufficient for the structures proposed for construction
  • Due to supplied recommendations, the use of shallow foundations are not favorable (especially in cases of a necessity to fill, excavate or combine both)

The Piling works are carried out based on the recommendations supplied, prior to which a subsoil investigation must have been carried out.

Piling may take the forms of

  • Driven cast-in-situ Piles: in which steel cased pipes of specified sizes are driven into the soil to the recommended depths, either open or close ended, and filled with concrete and reinforcement.
  • Bored cast-in-situ Piles: In which the drilling rig is fitted with a drilling bit of a specified size and bored to the recommended depth. The walls of the hole are held from collapsing by the use of cementing chemicals, or in critical cases of very soft surrounding material, the use of light permanent casings may be used. The hole is then filled with concrete and reinforcement.
  • Prefabricated concrete piles: The pile are fabricated and reinforced to specified sizes and lengths and conveyed to the site where they will be driven in at the pile positions.

  • Stone Piles: In this piling method, the crawling crane, the hammer, cylindrical casing casings of specified sizes, and ladder or rig are used. The engine is diesel type and works with a piston which drums the pipes to desired depths. The ladder or rig on the other hand carries the hammer which is attached to the crane arm and guides the pipe head or cap.