Driven precast piles
Technique

Driven precast piles are  installed using impact or vibration hammers to a design depth or resistance.

/expertise/techniques/driven-precast-piles
Minipiles
Technique

Minipiles are a deep foundation element constructed using high-strength, small-diameter steel casing and/or threaded bars.

/expertise/techniques/minipiles
Bored piles
Technique

Bored piles are a very effective, state-of-the-art construction element with many applications in foundation and civil engineering.

/expertise/techniques/bored-piles
Secant pile walls
Technique

A secant pile wall consists of overlapping (secant) piles to form structural or cutoff walls and achieve the required water tightness. The design can incorporate steel bar or beams for reinforcement and anchors can provide additional lateral support, if needed.

/expertise/techniques/secant-pile-walls
Vibro concrete columns
Technique

This technique involves construction of concrete columns with a bottom-feed depth vibrator to transfer loads through weak strata to a firm underlying stratum.

/expertise/techniques/vibro-concrete-columns
Retaining structures
Technique

Our sister company, Phi Group, offers a range of retaining wall and reinforced soil systems including the Permacrib gravity system; the Andacrib modular precast concrete crib system; and Gabions that use steel mesh cages filled with a large angular stone…

/expertise/techniques/retaining-structures
Environmental stone columns
Technique

When aquifers underlay made ground a stone column is sometimes perceived as potential path for contamination. In reality, vibro treatment reduces the mass permeability and so this is rarely an issue. However, in some cases it is necessary to seal the base of the columns. This is where Keller’s…

/expertise/techniques/environmental-stone-columns
Restricted access piles
Technique

In restricted access situations, where large, heavy conventional plant cannot be used, we provide a choice of piling systems such as continuous flight auger, cased CFA, rotary bored, drilled rock socket or driven. A number of our restricted access rigs are able to enter buildings via a normal…

/expertise/techniques/restricted-access-piles
Pali Radice
Technique

Pali Radice (literal translation ‘Root Pile’ from the Italian) is a versatile foundation system using small diameter cast in situ bored piles, developed in Italy in the 1950s. It has been extensively employed as an underpinning/stabilisation system for strengthening existing foundations which…

/expertise/techniques/pali-radice