The pipe-bridge over the main A81 Glasgow to Aberfoyle road at Ballat is a substantial structure on the 42km long Katrine Aqueduct which transfers the main raw water supply for the City of Glasgow from Loch Katrine to Milngavie WTW.
Severe structural damage resulted from the impact of a high vehicle attempting to drive under the open-structured steel pipe bridge which resulted in a lengthy closure of the main road to enable a detailed assessment of the damage and a complex repair and reinstatement to be undertaken whilst ensuring the security of supply was maintained.
Following emergency mobilisation, temporary supports were installed together with other measures to maintain the integrity of the structure to enable a detailed investigation and the development of a permanent repair the main elements of which included:
An advanced warning system incorporating conventional signage, physical height restrictors and illuminating warnings were also incorporated to reduce the risk of future incidents, with the work subject to meticulous planning and careful execution throughout to ensure the critical water supply was maintained.
The overall project involves the off-site fabrication and installation of a new linkspan structure at Oban Ferry Terminal for client Caledonian Maritime Assets Ltd (CMal).
12th February 2019
GL making a return visit to the Sound of Kerrera off Oban, to undertake substantial repairs to the breakwater which suffered collision damage following an altercation with a workboat earlier this year.
14th December 2018
Michael Matheson MSP and Cabinet Secretary for Transport, Infrastructure and Connectivity covered all his portfolios at the official opening of the new Polmadie Footbridge giving pedestrian and cycle transport access,
18th September 2018