Pyrmont Bridge Structural Restoration
Pyrmont Bridge is currently in variable condition with deterioration to the structural timber fabric which needs to be stopped and reversed by a staged restoration process of which this project is the first stage of the main truss restoration works.
Client Brief
Originally opened in 1902, Pyrmont Bridge is a major thoroughfare for pedestrians between the areas of Pyrmont and the city. It is listed by Engineers Australia as a National Engineering landmark and in 2002 it was listed on the NSW Heritage Register. The Bridge is 369m long, comprising of 14 spans in total, with 12 fixed timber truss spans, 25m long by three metres high, plus two steel swing spans. Each of the 12 timber fixed spans consist of six parallel simply supported Allan timber trusses, totaling 72 throughout the bridge at approximately three metre centres.
To undertake the replacement of main truss timbers, application of protective coatings in the heritage approved livery and associated temporary support structures, connectors and fittings as identified for Spans 14, 1, 7 and 8 as well as headstock timber replacement for Pier Set 13.
What we delivered:
Work Package 2 Stage 1
Pier set 13 (Land-based)
Installation of Temporary works and jacking of the bridge spans clear of the pier set headstocks (400t jacking load)
Replacement of main headstock and corbel members at Pier Set 13 followed by the applications of protective coatings
Span 14 (Land-based)Design, fabrication and installation of a temporary works support system to enable the jacking/lifting and support of the bridge deck using a 24-point jacking system (340t jacking load)
Full Structural restoration of Span 14 supporting trusses and deck stringers
Concrete repairs to the underside of the bridge deck
Application of protective coatings to all members
Span 1 (Land-based)Design, fabrication and installation of a temporary works support system to enable the jacking/lifting and support of the bridge deck using a 24-point jacking system (360t jacking load)
Full Structural restoration of Span 14 supporting trusses and deck stringers — currently ongoing
Spans 7 & 8 (Marine-based overwater spans)Design and fabrication of a temporary works support system to enable the jacking/lifting and support of the bridge deck for the overwater spans using a 24-point jacking system (designed for a max. 430t jacking load) — fabrication currently ongoing