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Contractors World  - UK & Ireland
2012 Vol 2 No 8
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Forth Road Bridge Cable Corrosion - Page 3 of 4

Increasing traffic lodas require constnt maintnenace of the road surface. Engineers are now investigating how to imrpove durability of expansion joints.Heavy traffic means constant highway surface maintenance

Increasing traffic lodas require constnt maintnenace of the road surface.  Engineers are now investigating how to imrpove durability of expansion joints.

A tender was awarded to Raynesway Construction in February 2012 to carry out a trial replacement of a limited number of the deck joints on the main and side spans.

The trial will determine whether or not an alternative half joint detail can help to minimise the issues that are caused by the original detail. These include a large amount of maintenance time spent repairing the existing joints using overnight carriageway closures and occasional emergency daytime temporary closures; the secondary effects of the dynamic loading on some truss members and surfacing, and the ride quality experienced by users.

    Work commenced on site in August 2012 and following extensive engineering design work by Fairhurst, the engineers for the project, a further revision to the detail and method of installation has allowed the trial to go ahead without requiring daytime weekend closures. All the required carriageway closures will be now be carried out overnight which will minimise disruption to users.

As in all cases involving working overnight on the bridge, noise and other environmental issues will follow guidance set by both Fife and the City of Edinburgh Council. However, there is the potential that works overnight involving steelwork modifications, whilst within acceptable noise levels, can still cause disturbance to some local residents especially on calm evenings.

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Bridge bearings successfully replaced

Balfour Beatty commenced work on site on the Viaduct Bearing Replacement contract on 17 May 2010 and the project was substantially completed by September 2012.

No disruption to daytime traffic has been caused as a result of this project. It was expected that some overnight restrictions might be necessary to ensure that the jacking and lowering of the bridge deck could be sufficiently controlled, however this did not prove necessary.

Balfour Beatty commenced work on site on the Viaduct Bearing Replacement contract on 17 May 2010 and the project was substantially completed by September 2012.

No disruption to daytime traffic has been caused as a result of this project. It was expected that some overnight restrictions might be necessary to ensure that the jacking and lowering of the bridge deck could be sufficiently controlled, however this did not prove necessary.

A major project to replace the bearings on the Forth Road Bridge’s north and south approach viaducts began in May 2010. The project was scheduled for completion by the end of 2012.

The approach viaducts sit at either end of the bridge on each shore, connecting the A90 with the main body of the suspension bridge. Unlike the middle of the bridge, which is suspended from the main cables, the approach viaducts are supported by reinforced concrete piers. Steel bearings sit on top of these piers, allowing the deck to move as required by changes in temperature and traffic loading.

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Page updated: November 2012

 

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