Dynamic compaction involves the controlled impact of a crane hoisted weight, of around 10-30 tonnes, falling in a pre-determined grid pattern to improve loose, granular soils and fills.
Rock grouting is normally done in fissured rock to reduce the flow of water along the joints and discontinuities in the rock.
Low mobility (compaction) grouting involves the injection of a low slump, mortar grout to densify loose, granular soils and stabilise subsurface voids or sinkholes.
Bulk filling generally uses a cement/pulverised fuel ash (PFA) mix to suit site conditions with compressive strengths in the order of 1.0 N/mm2. The mixes may include Sand and Bentonite etc as required. Gravel is introduced to fill major voids and/or to form containment barriers.
Polyurethane grouting involves the injection of expanding polyurethane to fill and seal cracks and voids and re-level slabs.
Driven piles are deep foundation elements installed using impact or vibration hammers to a design depth or resistance.
Franki piles, also known as a driven cast in-situ pile (DCIS), are high-capacity, cast-in-place elements constructed using a drop weight and casing.
Ductile piles are a deep foundation method using the displacement technique with prefabricated piles made of ductile cast iron available in 118 mm and 170 mm diameters with different wall thickness.
Micropiles, also known as minipiles, pin piles, needle piles, and root piles, are a deep foundation element constructed using high-strength, small-diameter steel casing and/or threaded bars.
Shotcrete can be used to create a natural-looking surface covering sculptured, textured or stained while wet to blend in with the environment.
Bored piles are a very effective, state-of-the-art construction element with many applications in foundation and civil engineering.
Bored piles are a very effective, state-of-the-art construction element with many applications in foundation and civil engineering. Temporary and permeant steel casings are used for a number of engineering reasons.
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.
This technique involves construction of concrete columns with a bottom-feed, down-hole vibratory probe to transfer loads through weak strata to a firm underlying stratum.
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.
A bridge crossing a body of water creates difficult conditions for the construction of its foundations. Keller can use various techniques to meet the challenges according to the soil, environmental impact assessment, current and water depth.
Keller has the experience and expertise to construct long jetties into deep water to allow the berthing of large vessels without the need for any dredging.
Keller has the engineering capacity to design flexible and tailored quay construction solutions to meet different soil conditions and requirements.
Demolition of quay walls can be a long and costly process, making their repair or improvement a more cost-effective solution. Keller has a wide portfolio of techniques combined with extensive experience to design a bespoke solution adapted to any situation.
Injection systems involve the injection of aqueous solutions into the ground to treat expansive, collapsible, and desiccated clay and railroad subgrade mud pockets.