Dewar Place Edinburgh

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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