Allerton Steel Bridge fabrication and Installation

Posted on 12 May 2025

Allerton Steel has fabricated and installed Lime Kiln Road Bridge, Newport. The bridge has two spans of 27.5m and 23.4m with one span crossing over the Great Western Railway mainline. The overall width was 10.3m, consisting of a 7.3m carriageway and a 3.0m wide cycleway which also carried services including a gas main.

The main structure consisted of 6 x fabricated beams, manufactured as 3 braced pairs. Maximum length of a beam was 28.5m weighing 11.5 tonnes. The beams were lifted in to position using a 500 tonne crane, with the heaviest lift weighing 36 tonnes.

The bridge was painted with Network Rail N1 specification with thermally applied metal spray.

Operating from modern workshops with over 4500sq/m (50,000sq/ft) capacity. The workshops offer a lift capacity up to 60 tonnes and are equipped with modern plant and machinery including semi-automatic welding, CNC operated profile, saw, drilling and milling machines. Additionally, we have a 3D modelling and surveying system to assist with complex fabrications and inspection.

• Welding - MIG, Sub-arc, - High tensile and weathering steels.

• Fabrications up to 40m long & 60 tonne

• In-house machining, 3 no. High Accuracy milling machines. 11m bed, 11m travel 2.5 face up size

• Profiling - 27m x 3m deck. 300mm thickness, bevel and straight cutting. Automatic drilling head

• 60 T overhead crane capacity

• CNC drill and saw line up to 914UB size

• Site welding services

• Proof loading

• Weld test; MPI or Radiography

• Trial fit

• 3D modelling system

• Mechanical & hydraulic assembly

UKCA Marked to Class 4 BS EN 1090, for Military we are JOSCAR approved, for highways bridges we are NHSS Sector 20 and RQSC qualified, for Network Rail-bridges we are RISQS qualified. We hold ISO 9001:2015, ISO 45001:2018 and hold the BCSA Sustainability Award - Silver Standard and Construction Line - Gold Standard.