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CLIENT
Morgan Sindall (EGIP Alliance)
PROJECT
Edinburgh to Glasgow Improvements (EGIP) Project Millerhill Depot Embankment Works
LOCATION
Millerhill Electric Train Depot, Edinburgh
OVERVIEW
Excavation, regrade and installation of soil nails including removal of injurious weeds.
THE CHALLENGE
Morgan Sindall appointed TRAC as a subcontractor, to plan, manage, supply and install a slope retention system, which involved excavating and re-profiling the embankment to provide toe level clearance, and the installation of 180 soil nails. The nature of the ground dictated that the embankment be secured against potential failure at all times by a netting system. Surveys had discovered a historic mineshaft in the centre of the crest space which caused substantial delays to the works begore they began. During this delay the already de-vegetated embankment became subject to the growth of Giant Hogweed, an injurious (hazardous to health) weed which had infested most of the surrounding area.
THE APPROACH
TRAC appointed a team to remove the Giant Hogweed, ensuring that no cross contamination occurred with multiple contractors working on site, and disposing of the resulting waste as is appropriate for such species. Excavated material was transported to a designated bund where the potential contaminant will be controlled by localised herbicide treatment in the subsequent years. Physical Barriers were implemented along the crest to implement safe working limits for the long-reach excavator, allowing for works to be undertaken in ALO (Any Line Open) Conditions and preventing the excavator from affecting the mine shaft. All soil nails were installed with an excavator mounted Drill Rig, eliminating the set up time associated with an A-Frame Rig, and the drill operation and bar insertion controlled by TRAC’s rope access technicians.
BEFORE
AFTER
Clydeside Farm, Lamington, Biggar, South Lanarkshire, ML12 6HS
Clydeside Farm, Lamington, Biggar, South Lanarkshire, ML12 6HS
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