Lagentium Viaduct

Revision as of 12:00, 12 March 2019 by (talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
               Lagentium Viaduct.jpg

This three-span multi-girder composite viaduct carries the new A1(M) dual three-lane motorway over the River Aire to the east of Castleford (Roman name - Lagentium), and forms part of the A1 upgrade between Darrington and Dishforth.

The deck comprises eight plate girders fabricated from S355J2 steel to EN 10025-2[1] with a central span of 85m, and side spans of 35m. Elliptical columns provide the intermediate supports, at which point the girders are haunched up to 4.5 m deep.

The girders were assembled into braced pairs adjacent to the site, moved up to the erection crane by SPMT (self propelled modular trailer), and then lifted into position by a 1200t capacity AK680 strut jib crane positioned behind each abutment.

The 2009t of steelwork was erected during the summer of 2004, the viaduct was completed in October 2005 and the new A1(M) opened to traffic in January 2006.

Structural Engineer Parkman
Steelwork Contractor Mabey Bridge Ltd.
Main Contractor RMG (A1) Construction Joint Venture
DBFO Company Road Management Services (Darrington) Ltd.
Client Highways Agency


  1. BS EN 10025-2: 2004, Hot rolled products of structural steels, Part 2: Technical delivery conditions for non-alloy structural steels, BSI