Lancashire Bridge

Lancashire Bridge is comprised of a number of different structures constructed alongside each other as it was widened over the centuries to meet the growing economic demands of the town centre.  Following structural investigations to a reinforced concrete section of the structure, the deck was found to have serious structural problems affecting its load carrying capacity and the decision was made to remove the roof section and strengthen the remainder of the surrounding structure.

The constraints of this tight site ensured that construction activities had to overcome many logistical challenges during the project including -

• Liaison and management of major service diversions prior to demolition.
• Design and Installation of rock anchors to permanently tie back the South East culvert walls which were inserted from ground level through the existing roof prior to demolition.
• Cutting and lifting out of the deck and supporting beams using diamond tipped equipment to reduce environmental impact.
• Installation of substantial temporary steel bracing to maintain structural integrity once the main portal and secondary beams were removed.
• Other extensive temporary works for crane outrigger supports, scaffold adaptations and falsework.
• Construction of a new reinforced concrete ring beam in coloured concrete which then enabled the removal of the substantial temporary bracing.
• Installation of 2500m² of conservation slab paving to provide new public realm space and realignment of adjacent Warren Street surfaced in buff coloured asphalt
• 1000m² of sprayed waterproofing to other areas of culvert deck all in such a sequence as to limit the impact on shops and shoppers.
• Extensive concrete repairs to the remaining areas of the structure
• New masonry pilasters, balusters and copings to the bridge.
• Installation of new bollards, iron railings and street furniture.