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Key Facts

  • Client: Scottish Water Solutions 2
  • Engineer: AECOM
  • Conditions of contract: NEC3 Option A
  • Contract value: £590,000
  • Duration of works: Oct 2012 – June 2013 (8 months)

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Reservoir Working

Afton Reservoir

The work was undertaken at the remote Afton Reservoir, near Cumnock in East Ayrshire and the reservoir is the main strategic water supply source for the greater part of East Ayrshire and surrounding areas.

Visible signs of movement of the valve tower had raised doubt over the structural integrity of the external structural masonry & internal access floor and the tower access bridge had deteriorated to the extent that, it been necessary to place a restriction of two persons using the bridge at any one time in the interest of health & safety.

Following a structural assessment under the direction of the Reservoir Engineer, the resulting work comprised the reconstruction of the structural masonry draw-off valve tower and replacement of the valve tower access bridge.

The castellated octagonal masonry tower structure was carefully dismantled to below the bridge bearing level to allow the disconnection of the 60t composite steel and concrete old bridge which was later lowered onto a flotation barge and removed. Following reconstruction of the reinforced concrete tower house floor, a new 32m, lattice-frame steel bridge was floated out and jacked up into position.

The reservoir is located 400m above sea level with access via a narrow and rough forestry track. For operational supply reasons, much of the work had to be undertaken during the winter months and severe weather conditions provided a considerable challenge. In addition the downtaking and reconstruction works were carried out within a full-containment scaffolding to ensure there was no pollution of this strategic water supply.

The high-quality reconstruction of the ornate masonry structure completed the works.

KEY FEATURES

  • Challenging access
  • Extreme winter weather working
  • Off-site Bridge Fabrication
  • Containment encapsulation
  • Innovative Barge Access
  • High quality masonry

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George Leslie Ltd, Blackbyres Road, Barrhead, Glasgow, G78 1DU  |  mail@georgeleslie.co.uk  |  +44 (0)141 881 9131