Wagstaff Piling is a pioneer in various ground improvement techniques in Australia and New Zealand and has presented at many international conferences on ground improvement topics.

We have been contracted to provide ground improvement services throughout Australia and New Zealand, including for environmental projects and the mitigation of seismic effects.

The CSM technique is a versatile ground improvement method for various types of temporary or permanent walls, retaining structures and shafts as well as structural foundation piles.

The CSM technique is a globally regarded, cost-effective construction solution for stabilising soils in-situ by mixing the soil with suitable grouts such as bentonite and/or cement. The method is highly beneficial in the in-situ treatment of acid sulphate soils, controlling potential soil liquefaction, containing contamination and the settlement control of a variety of structures.

A stabilised bridging layer constructed by Wagstaff Piling is a horizontal soil mixing process using equipment that efficiently and rapidly mixes binders with the soil in horizontal passes, up to a depth of 500mm. The stabilised bridging layer can be used in combination with, or independent of, other ground improvement methods and has a wide range of applications in civil engineering and building projects.

This method improves the soil by the use of an excavator base with an attached mixing head to combine either a wet or dry binder. This method can also be utilised for underwater applications.

Rotary soil mixing is a deep soil mixing process using rotary drilling methods and fluid grout injection. The concept is for high speed rotation of small diameter hollow core drill strings, with a mixing tool that facilitates fluid grout injection. The mixing tool is sized to suit the column diameter to be formed, and fluid grout is injected at the mixing head either at low pressure through standard equipment, or at high pressure through jetting nozzles.

This technique uses a hollow stemmed auger which is rotated into the soil to the required depth. A cement-based slurry is injected, at low pressure through the auger, to construct a column as the auger is withdrawn. The combined effect of soil densification and soil reinforcement improves the characteristics of the soil due to this composite action.

Wagstaff Piling’s jet grouting equipment includes specialised grouting rigs, high pressure pumps, intermediate pressure flushing pumps, automatic batching plants, powder silos and agitation tanks.

Our previous project work has provided us with significant experience and know-how to provide jet grouting solutions for tunnelling, mining, land remediation, infrastructure/transport and other civil projects.

Our jet grouting applications cover, but are not limited to Ground Improvement, Cut-off Walls/Curtains, Tunnelling, Break-out Structures, Low-headroom Conditions and Reinforced Columns.

Wagstaff Piling has the capability to undertake permeation grouting projects for a variety of applications using both cement and chemical grouting techniques. Some typical applications are to reduce the permeability and increase the strength of bund and dam walls and controlling foundation and soft ground settlements in granular soils.

These methods improve the soil and its engineering properties to increase its in-situ strength, to control settlements and to improve its performance under cyclic or other transient loads.

Wagstaff Piling has the capability to undertake ground improvement works and other types of foundation projects, where providing access for heavy-duty equipment is economically prohibitive or not permitted due to environmental considerations. The amphibious plant can be set up with ground improvement equipment for a variety of different techniques, such as soil mixing, jet grouting or permeating grouting, depending on the project’s requirements.

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