Dewar Place Cable Tunnel, Edinburgh
Donegan Civil Engineering recently completed this project direct for Scottish Power in the centre of Edinburgh.
The purpose of the project was to bring a new high voltage cable in through the tunnel to feed the new electrical sub-station.
The works involved constructing a 6.00m diameter drive shaft approx 24m deep, as can be seen in this picture, a 6.00m diameter reception shaft approx 13m deep, followed by a 2.10m diameter segmental tunnel approx 200m in length with a 90m radius curve along the line.
The drive shaft was constructed within a communal garden in a residential area, with the reception shaft located within what will be a new electrical sub-station.
Donegan procured a specially designed ’Roadheader Tunnel Boring Machine’ for the project which involved tunnelling through dolerite sub-volcanic rock with strengths recorded of up to 190mpa.
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