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
Dynamic replacement
Technique

Dynamic replacement is a variation on dynamic compaction and uses the energy of a falling weight to drive large diameter granular columns into cohesionless soils and fills.

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INSER piles
Technique

The INSER® pile or screw-in moulded pile is moulded into the ground, inserted using a delivery tool, without soil extraction. It is inserted (without vibration) using a specific auger that penetrates into the ground by a lateral displacement effect of the ground. Unlike the traditional auger…

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Third generation piles Type 3
Technique

The 3TER® hollow auger pile is a new generation continuous flight auger pile, operated using a specific work group to ensure a better quality of concreting when the auger train is raised. This improvement is achieved by the action of a rotating telescopic dip tube (TER) at the bottom of the…

/expertise/techniques/third-generation-piles-type-3
Induction Hydraulique®
Technique

Induction Hydraulique® combines the horizontal vibrations generated by the vibrator and the lateral delivery of the soil to obtain an optimal compaction of the soil. In the case of an insulated substitution block, the lateral discharge of the material compacted by Induction Hydraulique®…

/expertise/techniques/induction-hydrauliquer
Jet grouting
Technique

Jet grouting uses high velocity fluid jets to construct cemented soil of varying geometries in the ground.

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Contiguous pile walls
Technique

Contiguous pile walls consist of piles arranged in a way that a gap remains between the piles. Where required the soil between the piles can be stabilised during excavation by either installing timber lagging in front of the excavated soil or by building a reinforced shotcrete wall towards the…

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King post / soldier piles and lagging walls
Technique

King post/soldier piles and lagging walls are a cost effective system of temporary or permanent retaining wall using beams and pre-cast concrete panels.

/expertise/techniques/king-post-soldier-piles-and-lagging-walls
Diaphragm walls / barrettes – grab
Technique

Vertical panels are excavated under stabilising slurries using mechanical/hydraulic clamshell grabs or hydromill cutters to form a continuous cut-off, retaining and/or structural wall.

/expertise/techniques/diaphragm-walls-barrettes-grab
Sheet piles
Technique

Sheet piling retains soil, using steel sheets with interlocking edges and is applied using both vibratory and vibration-free installation rigs.

/expertise/techniques/sheet-piles