View source for East Coast Mainline Bridge for High Speed 1

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This 1577t through [[Bridges#Truss bridges|truss girder bridge]] has a clear span of 75m and carries the new twin track High Speed 1 over the busy East Coast Mainline approximately 1km north of Kings Cross station. 

In order to minimize construction risk and the need for very costly [[Design for steel bridge construction#Erection during possessions|rail possessions]], required for the installation of the intermediate supports between tracks, a cost effective single span structure was chosen. The bridge is clad primarily to reduce the impact of noise on local residents, but this also enhances the aesthetics of the bridge. The cladding is an external ‘cassette’ type system for ease of replacement and has an internal fire and acoustic lining.  [[Weathering steel]] was used for the steelwork below the composite slab, as access for future maintenance will be difficult.

The main [[Material selection and product specification#Structural steel|steel grades]] used are listed below. There was also a requirement for some of the [[Weathering steel|weathering steel]] to have guaranteed [[Material selection and product specification#Through thickness properties|through thickness ductility]], i.e. Z35 to EN 10164<ref name="no1">BS EN 10164: 2004, Steel products with improved deformation properties perpendicular to the surface of the product - technical delivery conditions. BSI</ref>.

*S355J2 to EN 10025-2<ref name="no2">BS EN 10025-2: 2004, Hot rolled products of structural steels, Part 2: Technical delivery conditions for non-alloy structural steels, BSI</ref> for plates up to 65mm thick.
*S355J2W to EN 10025-5<ref name="no3">BS EN 10025-5: 2004, Hot rolled products of structural steels, Part 5: Technical delivery conditions for structural steels with improved atmospheric corrosion resistance, BSI</ref>  for plates up to 65mm thick.
*S355NL to EN 10025-3<ref name="no4">BS EN 10025-3: 2004, Hot rolled products of structural steels, Part 3: Technical delivery conditions for normalized / normalized rolled weldable fine grain structural steels, BSI</ref> for plates 80mm thick and over.
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The structure was assembled online adjacent to its final position using a combination of site [[Connections in bridges#Welded connections|welding]] and [[Connections in bridges#Bolted connections|bolted joints]], and then [[Design for steel bridge construction#Launching|launched]] across the busy East Coast Mainline during a 72-hour possession at Christmas 2003, to minimize disruption to rail users.

{|class="wikitable"  width=400
|-
|'''Architect'''||Rail Link Engineering
|-
|'''Structural Engineer'''||Rail Link Engineering
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|'''Steelwork Contractor'''||Watson Steel Structures Ltd. <br>(now Severfield (UK) Ltd)
|-
|'''Main Contractor'''||Kier Nuttall JV
|-
|'''Client'''||Union Railways
|}

==References==

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[[Category:Case studies - Bridges]]