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Scottish Trunk Road Network - South East Unit - Forth Road Bridge Side Tower Lateral Thrust Bearing
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Descriptions
BEAR Scotland is seeking to appoint a suitably experienced SubContractor to undertake the Side Tower Lateral Thrust Bearing Refurbishment scheme with an estimated value 1.2 million GBP.The Forth Road Bridge is a long span suspension bridge which spans over the Firth of Forth linking Edinburgh to Fife. The side Span is 408m long, Main Span is 1006m long.Two longitudinal stiffening trusses form the basis of the suspended structure, which are connected to one another by regular cross girder trusses.At the Side Towers, the ends of the truss transfer vertical load to the side tower through the vertical rocker bearings which sit on top of reinforced concrete corbels protruding from the side towers. Plan bracing is provided between the east and west trusses in the planes of the top and bottom chords, forming bays of approximately 18m (60feet) in length. The plan bracing transfers the lateral loads (primarily wind) to the Side and Main Towers’ lateral thrust bearings.The side tower lateral thrust bearings have not been replaced since the bridge was built. The top laterals taper down and bear onto a milled bearing block. A gusset plate is bolted to the top of the tapering members. The bearing block is in contact with machined cylindrical surface on the bearing slab, forming a vertical rocker bearing.Three 100mm diameter steel tubes are cast in the concrete and through these tubes, 64mm diameter steel bars are post tensioned securing the bearing blocks. The 64mm dia bars have been assessed to be sub-standard and are in need of replacement. The scheme will require at both side towers:- The installation of temporary access provisions to provide access both externally and internally of the reinforced concrete side towers;- The fabrication and installation of a large steel jacking frame.- De-tensioning and removal of three post tensioned bars sequentially at each location followed by the reinstallation and jacking of replacement post tensioned bars.- Installation of a permanent steel bracing bracket which shall be attached to the side tower by coring and post tensioning bars to the existing concrete; and- Amendments to an existing impressed current cathodic protection system.
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Tender Regions
CPV Codes
45221110 - Bridge construction work
45221100 - Construction work for bridges
45221111 - Road bridge construction work
45233100 - Construction work for highways, roads
44212100 - Bridge
45223200 - Structural works
45233124 - Trunk road construction work
45221115 - Construction work for steel bridges
45233130 - Construction work for highways
44212110 - Bridge sections
45262400 - Structural steel erection work
45221119 - Bridge renewal construction work
Keywords
girders
bridge
viaduct
skeleton works
river span build
trunk road build
footbridge
bridge building
structural span
highway building
bridge sections
expressway build
vehicular span build
crossing structure
bridge overhaul works
steel structure build
main road pathway build
vehicular span erection
motorway corridor build
civil bridge restoration
highway construction
bridge erection work
metal frame installation
road bridge construction
span renovation works
transport overpass build
expressway erection
overpass erection
multi-lane highway works
traffic bridge build
structural construction
civil highway span build
bridgework services
bridge refurbishment
steel column assembly
prefabricated span units
structural bridge repair
highway steel bridge
highway bridge building
highway overpass build
crossing infrastructure
steel transport span
major route construction
road pavement works
asphalt span erection
trunk route pavement
steel skeleton building
trunk road construction
civil engineering bridge
civil bridge projects
deck renewal project
structural steelwork
modular bridge panels
steel frame bridge build
industrial steel bridge
superstructure erection
welded steel overpass
bridge construction
road construction
high load steel span
civil bridge building
steel beam erection
span structure construction
transport bridge structure
basic structure construction
bridge superstructure renewal
transport bridge construction
roadway crossing construction
reinforced structure build
transport corridor construction
main logistics road build
arterial road installation
industrial steel erection
prefabricated bridge components
primary highway infrastructure
national highway construction
arterial trunk carriageway build
motorway bridge construction
transport highway construction
interregional road erection
national route development
lifecycle upgrade of bridge
supporting frame assembly
intercity road construction
reinforced steel infrastructure
structural steel erection work
controlled-access highway erection
restoration of existing bridge span
modern steel bridge erection
roadway infrastructure build
steel framework installation
civil structure installation
foundation and framework works
structural crossing infrastructure
bridge rehabilitation construction
structural shell creation
structural steel positioning
load-bearing system build
steel bridge construction
expressway overpass build
structural bridge erection
road-based transport corridor build
bridge superstructure work
structural steel span build
crossing infrastructure build
freeway infrastructure works
vehicular corridor construction
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