Introducing
In-Situ Trench Mixing
A proven solution
for soft ground engineering.
GSI has extensive expertise, design capability, market leadership and a 20 year track record of soil mixing in NZ. This knowledge can now be applied directly to the In-Situ Trench Mixing (ITM) method providing designed solutions and successful project outcomes.
ITM is ideally suited to providing in place soil mixing in one continuous pass. This method has a wide range of applications across a range of soft ground conditions. This technology presents the latest method designed to provide cost effective soil cement mixing.
Advantages of the ITM process
In contrast to the use of conventional diaphragm wall equipment or secant piling, which carries out segment by segment walls or overlapping circular piles, the ITM process achieves a continuous structure over the entire length of the wall. Misalignment of any individual segments is therefore eliminated, thereby enhancing Quality Control.
The blade of the ITM attachment mixes the soil in-situ continuously over the entire installation depth. This ensures that the soil-cement structure is uniformly homogeneous in all aspects after curing. Greater mixing homogeneity is achieved compared to cutter mixing or DSM.
As the chain is fitted with dragon teeth cutters, the soil-cement structure can be easily integrated into existing rock deposits to ensure proper sealing at the connecting points.
The ITM construction process is faster than D Wall, cutter mixer or circular piling resulting in cost effective and fast installation.
Applications
The ITM process is extremely versatile for addressing soil permeability and load bearing issues.
It can, for example be used to seal excavations or enclose polluted areas. It can also be used to seal dams, dykes and other bodies of water as well as creating a barrier to prevent waves travelling from sources of vibration. In trenching and construction of large warehouses, it can be used to fill the gaps between supports.
It can also be used in applications for new road embankments being built on soils with low load bearing capacity requiring the bearing capacity to be increased and reduce settlement and seismic conditions to cope with extra weight or higher traffic speeds. These include some high-speed railway and motorway routes.
The ITM equipment can mix to a depth of up to 16 metres and a width of 950mm making this a very versatile mixing method.
Quality control
As with all GSI technologies, the ITM method features a high level of quality control.
From initial site investigations and analysis through to laboratory mix designs, field trials, project execution, post construction testing and project close out.
An on board computer and monitor provides operator information and data capture to achieve design parameters and download for analysis. Depth, mixing speed, and machine parameters are displayed and captured. Grout mixes are designed and automated batching and flow and pressure meters provide grouting data display and capture ensuring high level quality control.
High-precision positioning of the mixing attachment using GPS sensors located on the excavator. Satellite-based navigation and data acquisition processing are integrated in a compact system enabling optimal operator assistance for the ITM process. All essential information is immediately available on a single monitor in the operator’s cab.
Contact
GSI has experienced engineers and designers to develop cost effective optimised ground engineering solutions from early contract involvement, concept development, technical input and design advice – GSI are your motivated partner of choice.
Graeme Quickfall
021 02713849
graeme@gsinz.nz