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Management of half joints in RTA bridges
In recent years, there has been heightened concern over the performance of half joints in bridges. This joint detail is known to be problematic as it is vulnerable to deterioration and is generally very difficult to inspect and maintain. The RTA owns and maintains in excess of 50 bridges that contain half joints in NSW. In order to proactively manage the RTA bridge stock, Bridge Engineering is seeking to identify and assess all bridges in their stock that contain concrete half joints. This paper looks at two bridges which have been identified to date with half joint concerns. In the first bridge, Stockton Bridge, the solution involved replacement of the bearings at the half joints. Due to limited access, a very innovative jacking system was designed and installed, making use of the non-structural areas of the superstructure. In the second bridge, Roseville Bridge, problems at the half joint were further complicated by a unique tension tie arrangement. The solution for this bridge involved redesign of the tension ties to provide access to the joints. The permanent solution is expected to involve making the bridge continuous over the half joint. (a) For the covering entry of this conference, please see IRRD abstract no. E218160.
AUSTROADS BRIDGE CONFERENCE, 7TH, 2009, AUCKLAND, NEW ZEALAND
Publisher: CONVENTION MANAGEMENT
Administration and Management; Bridges and other structures; Maintenance and Preservation; I24: Design of Bridges and Retaining Walls; I61: Equipment and Maintenance Methods
Crowthorne House, Nine Mile Ride
Nov 16 2009 12:17PM