As part of the NSW Government’s Bridges for the Bush program, Cardno’s expert Bridges team, led by Peter Boesch, Manager – Bridges, undertook the Demolition Designers Safety Report, which was integral to ensuring the safe demolition of Gee Gee Bridge – a heritage-listed Dare truss timber bridge in Southern NSW.
The historic bridge remained in service whilst the new wider and safer replacement bridge was under construction. After serving the community for almost 100 years, the treasured bridge was lifted and transported with delicate precision for donation to the Moulamein Heritage Village project, where it will continue to bring joy and educate future generations and tourists.
The bridge comprised of a Flood Relief Bridge portion as approach bridge and a main bridge over the Wakool River. The bridge demolition took place from late 2020 to February 2021 with the main lift of the truss span occurring on 10 February 2021.
Transport for NSW (TfNSW) constructed a new bridge over the Wakool River on Noorong Road. This new bridge was constructed parallel to the existing two timber bridges, B3235 Gee Gee Flood Relief Bridge and B3237 Gee Gee Timber Truss Bridge. To continue providing services to the public during the new bridge construction period, the road alignment was locally modified between the southern approach road of Gee Gee Timber Truss Bridge and the northern approach of Gee Gee Truss Flood Relief Bridge. The new bridge and the approach road works were completed and have been open to the public since 1 May 2020.
Cardno were engaged by TfNSW to provide the timber bridge demolition engineering services as per RMS QA Specification B341, RMS QA Specification G22, Safe Work NSW Demolition Work Code of Practice and AS2601-2001 Demolition Structures.
This Demolition Designer’s Safety Report (Safety Report) provided the engineering investigation outcomes and the assessments on the proposed demolition methodology for B3237 Gee Gee Dare Truss Bridge.
The original Dare Truss Bridge had six spans with an overall length of 72.5 metres, two approach spans at the Swan Hill end, a Dare type timber truss span and three approach spans at the Wakool end. It is located about 33 kilometres east of Swan Hill, Victoria and located in the Murray River Council local government area (LGA), NSW and TfNSW South West Region.
This bridge was constructed in 1929 and the Dare type timber truss spanned 27.7 metre span over the Wakool River. The bridge had a single traffic lane for ST42.5 vehicles, with a clear width of approximately 5.5 metres and timber posts and railings along the full length of the bridge. The truss span had a clearance of about four metres over normal water level.
The approach spans were typical timber girder spans with five timber stringers,100 thick transverse timber planks and 50 thick longitudinal timber boards. The approach span lengths were between 8.5 metres to 9.2 metres.
These approach spans were similar to the B3235 Gee Gee Flood Relief Bridge.
This bridge was listed as a heritage item on the NSW State Heritage Register, RMS’s Section 170 Heritage and Conservation Register and the Wakool LEP but was delisted.
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