Mixed modulus columns, also known as columns with Mixed Moduli, mixed columns or CMM® is a sustainable ground improvement method using high deformation modulus columns constructed through compressible soils to reduce settlement and increase bearing capacity. CMM® is the combination of a rigid…
Jet grouting uses high velocity fluid jets to construct cemented soil of varying geometries in the ground.
Compaction grouting involves the injection of a low slump, mortar grout to densify loose, granular soils and stabilise subsurface voids or sinkholes.
Compensation or fracture grouting is the injection of a cement slurry grout into the soil creating and filling fractures that then lift the overlying soil and structures.
Permeation grouting, also known as cement grouting or pressure grouting, fills cracks or voids in soil and rock and permeates coarse, granular soils with flowable particulate grouts to create a cemented mass.
Rock grouting is normally done in fissured rock to reduce the flow of water along the joints and discontinuities in the rock.
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.
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…
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.
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…
Dry soil mixing is a ground improvement technique that improves soft, high moisture clays, peats, and other weak soils, by mechanically mixing them with dry cementitious binder.
Wet soil mixing, also known as the deep mixing method, improves the characteristics of weak soils by mechanically mixing them with cementitious binder slurry.
Continuous flight auger (CFA) piles are drilled and concreted in one continuous operation enabling much faster installation time than for bored piles. Reinforcement is placed into the wet concrete after casting, enabling the pile to resist the full range of structural loading.
Driven precast piles are installed using impact or vibration hammers to a design depth or resistance.
Bored piles are a very effective, state-of-the-art construction element with many applications in foundation and civil engineering.
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.
Minipiles are a deep foundation element constructed using high-strength, small-diameter steel casing and/or threaded bars.
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…
