Excavation support
Solution
Excavation support During construction it is often necessary to form a stable excavation and to ensure that any associated movement will not damage neighbouring structures or utilities. Keller offers…
/expertise/solutions/excavation-support
Marine structures
Solution
Marine structures Keller offers a full range of services for the marine construction market. This includes the design and construction of new ports, jetties and quays as well as the extension and…
/expertise/solutions/marine-structures
Mass mixing
Technique
Mass mixing Mass mixing (MSM) is a specialised technique used to improve soft soils and loose sands, as well as fill materials. The technique is very flexible and can be used over water and on land.…
/expertise/techniques/mass-mixing
Soil nails
Technique
Soil nails Soil nailing uses grouted, tension-resisting steel or glass fibre composite elements (nails) to reinforce in situ soils to create a gravity retaining wall for permanent or temporary…
/expertise/techniques/soil-nails
Compensation / fracture grouting
Technique
Compensation / fracture grouting Compensation or fracture grouting is the injection of a cement slurry grout into the soil creating and filling fractures that can then be potentially used to lift the…
/expertise/techniques/compensation-fracture-grouting
Download
Keller at a glance
Resource
Keller at a glance At a glance 2025 Infosheet Facts and figures about Keller Group Download
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Driven steel piles
Technique
Driven steel piles Driven steel piles are installed using impact or vibration hammers to a design depth or resistance. Keller installs the complete suite of driven piles from small diameter tube…
/expertise/techniques/driven-steel-piles
How we work
Landing page
How we work Training photo Code of conduct Our business code of conduct sets out the principles and standards of behaviour we expect from all our employees. Our business code of conduct sets out the…
/how-we-work
Canopy / umbrella tubes
Technique
Canopy / umbrella tubes Canopy/umbrella tubes (with diameters of typically 76-168mm but occasionally larger) are a support system used in conventional and mechanical tunnel construction in poor soil…
/expertise/techniques/canopy-umbrella-tubes
CFA piles
Technique
CFA piles Continuous flight auger piles (CFA) are cast-in-place piles, using a single continuous hollow stemed auger. Vibration free and low noise, this environmentally friendly piling system is…
/expertise/techniques/cfa-piles
Permeation grouting
Technique
Permeation grouting Permeation grouting, also known as cement grouting or pressure grouting, permeates coarse, granular soils with flowable particulate grouts to create a cemented mass. Permeation…
/expertise/techniques/permeation-grouting
Vibro compaction
Technique
Vibro compaction Vibro compaction is a ground improvement technique that densifies clean, cohesionless granular soils with a downhole vibrator. It’s a technique first developed by Keller in the 1930s…
/expertise/techniques/vibro-compaction
Vibro stone columns
Technique
Vibro stone columns This technique involves construction of loadbearing columns made from gravel or crushed stones with a vibrator to reinforce all soils in the treatment zone and densify surrounding…
/expertise/techniques/vibro-stone-columns
Dry soil mixing
Technique
Dry soil mixing Dry soil mixing is a ground improvement technique that improves soft, high moisture clays, peats, and other weak cohesive soils, by mechanically mixing them with dry cementitious…
/expertise/techniques/dry-soil-mixing
Re-levelling structures
Solution
Re-levelling structures Subsidence, the gradual downward movement of a building or structure, can result in damage to buildings. Keller can apply re-levelling techniques to bring buildings back to…
/expertise/solutions/re-levelling-structures
Employment practices
Content page
Employment practices Our people are our most valuable asset. We are committed to creating a work environment and culture that brings out their best and keeps Keller a great place to work. Equal…
/how-we-work/employment-practices
Wick drains / PVDs and earthquake drains
Technique
Wick drains / PVDs and earthquake drains Wick drains, also known as Prefabricated Vertical Drains (PVD) are prefabricated geotextile filter-wrapped plastic strips with moulded channels. These act as…
/expertise/techniques/wick-drains-pvds-and-earthquake-drains
Rigid inclusions
Technique
Rigid inclusions Rigid inclusions are a ground improvement method using high deformation modulus columns constructed through compressible soils to reduce settlement and increase bearing capacity.…
/expertise/techniques/rigid-inclusions
Dynamic compaction and replacement
Technique
Dynamic compaction and replacement Dynamic compaction involves the controlled impact of a crane hoisted weight, of between typically 10-30 tonnes, falling in a pre-determined grid pattern to improve…
/expertise/techniques/dynamic-compaction-and-replacement
Rapid Impact Compaction (RIC)
Technique
Rapid Impact Compaction (RIC) Rapid Impact Compaction densifies shallow, granular soils, using a hydraulic hammer, which repeatedly strikes an impact plate on the ground surface. Rapid impact…
/expertise/techniques/rapid-impact-compaction-ric