Mode of access: Rope Access
Task in hand: Rope Access Bridge Inspection
Location: QE Forrest, Scotland
Team Size: 4
Duration: 1 week
51m long, with a central span of approximately 25m, Duchray Old Truss Bridge was constructed in 1859, and is a three-span twin truss girder bridge structure founded on masonry piers and abutments. The Loch Katrine Aqueduct is a pressurised pipe carried within the truss carrying drinking water.
SG Access rope access bridge inspectors were tasked with Inspection for Assessment of Duchray old Truss Bridge, including:
- provision of method statement and risk assessment for the task in hand, including safe access, egress and rescue via rope access.
- familiarisation with the current defect schedule on the structure, prior to commencing site work in order to accurately report on the condition of all defects previously recorded.
- record the length and depth of each truss, as well as the spacing between the two parallel trusses.
- record structure dimensions including section sizes sufficient to produce a GA drawing.
- measure areas of section loss, and record their locations and extent, sufficient to allow a numerical assessment of the structure’s load capacity.
- record the location, extent and form of any new defects identified during the inspection, including provision of photographic report.