Completed Projects news

Soil Engineering and BachySoletanche develop a win, win, win solution for grouting sites

Soil Engineering Geoservices have implemented the use of a dust free mixing system on one of their bulk infill grouting sites.

As part of the on-going works currently being undertaken for Network Rails Borders Rail scheme, SEG were asked to carry out grouting works adjacent to a hospital.

In order to minimise noise, vibration and air pollution and improve the working environment for the site staff, SEG worked with the intergroup expertise of Bachy Soletanche to develop the dust free mixing system. The outcome is a system capable of mixing up to 200t of PFA grout per shift, with minimal dust produced. The computer controlled mixer produces a consistent grout, of reliable characteristics, mix after mix after mix after mix. The system controls its own material silos and water supply, using a MAT SC20K mixer station and requires only a single operator to manage the plant, whilst the 6m3 storage pan allows a significant buffer quantity to minimise delays in grout injection.

In testing, commissioning, and now in full production, the dust output of the system is virtually nil, and the electric power plant ensures low noise levels and reduced vibration, thus providing a much improved operator environment. The self-weighing system incorporated with in the plant ensures accurate material control, and minimises wastage whilst providing a high quality product consistently.

Not only is the system sympathetic to ever increasing environmental demands it also improves production and reduces waste ensuring a win, win, win situation for grouting sites.

Soil Engineering in Geothermal Loop Trials

As part of a site investigation for a commercial development in London, Soil Engineering have installed a Geothermal Loop for a Ground Sourced Heat Pump (GSHP) trial.

The 40mm diameter loop was installed into an 200mm diameter borehole formed to 70m below ground level. The 70m long loop was installed into the borehole with centralising spacers and the annulus backfilled with a specifically designed thermal grout. The borehole and loop design was specified by Consulting Engineer Arup and the grout was specially mixed to match the thermal conductivity of the geology and lithology of the borehole.

A Thermal Conductivity Test was carried out over a 48 hour period by specialist subcontractor GECCO2, with an additional 24 hour cool down period.

The results of the TCT will be used to design the Ground Sourced Heat Pump well field to meet the anticipated heating and cooling requirements of the commercial development.

Force Crag Mine Water Treatment Scheme

Soil Engineering is due to complete its latest commission awarded under The Coal Authorities Framework Agreement for Ground Investigation. The £80,000 project was to investigate Force Crag Mine in the Lake District.

The now abandoned mine, which was worked for Lead, Zinc and Barytes, is known to be a major source of metal contamination within nearby water courses and is also thought to contribute to reduced water quality levels in downstream water courses. These include the River Derwent and Bassenthwaite Lake which is a Special Area of Conservation (SAC) and Site of Special Scientific Interest (SSSI).

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