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…
If a construction project needs to monitor structural or ground movement or environmental properties like temperature, noise or vibration, Keller UK's sister company GEO-Instruments can design and install an instrumentation scheme, provide the software that…
Driven cast in-situ (DCIS) piles are constructed by driving a closed-ended thick-walled steel casing into the ground and then filling it with concrete.
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.
Driven precast piles are installed using impact or vibration hammers to a design depth or resistance.
Helical piles, also known as screw piles, are constructed using steel shafts with helical flights of various sizes to suit the site specific ground conditions.
Bored piles are a very effective, state-of-the-art construction element with many applications in foundation and civil engineering.
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.
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…
Single bore multiple anchor (SBMA) are ground anchors with multiple strands, each bonded to the soil/rock and carrying a load.
Contiguous pile walls consist of piles arranged in a line typically with a 150mm gap between the piles. Where required the soil between the piles can be stabilised using grouting techniques if necessary, either before or after pile installation.
King post walls are a cost-effective system of temporary or permanent retention using beams and precast concrete panels.
Slurry walls are constructed using a cement-bentonite slurry to produce a below ground low permeability barrier.
Minipiles are a deep foundation element constructed using high-strength, small-diameter steel casing and/or threaded bars.
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…
Dynamic compaction involves the controlled impact of a crane hoisted weight, of around 10-12 tonnes, falling in a pre-determined grid pattern to improve loose, granular and mixed soils and fills.
This technique involves construction of concrete columns with a bottom-feed depth vibrator to transfer loads through weak strata to a firm underlying stratum.
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 that we’ve used on thousands of projects since.
This technique involves the improvement of weak soils by the installation of densely compacted columns made from gravel or similar material with a vibrator. The displacement process reinforces all soils in the treatment zone and densifies surrounding granular soils. It’s a technique first…