Darley Abbey Mills, Bridge Assessment - Projects - MLM
Darley Abbey Mills, Bridge Assessment - Projects - MLM
Darley Abbey Mills, Bridge Assessment - Projects - MLM

Darley Abbey Mills, Bridge Assessment

Project Information
  • Location
  • Derby
  • Sector
  • Transport, Bridges
  • Services
  • Infrastructure, Civil Engineering

The project formed part of Derby City’s “Our City our River” project, to regenerate and refurbish this neglected part of the city and to improve flood defences. It comprised the inspection and structural assessment of the historic Toll bridge over the River Derwent, followed by an option study for its refurbishment or replacement. An archaeological study was undertaken by MLM to inform the options study.

The original bridge substructure and parapets had been retained, although the deck was replaced in the 1970s.

The deck was found to be beyond economic repair with delamination of the concrete cover and extensive reinforcement corrosion, although the sub-structure was found to be in relatively good condition, suitable for re-use. Remedial options considered included a further deck replacement on the existing sub-structure, demolition and an entirely new structure either on the existing site or nearby. The potential for retention of the original historic substructure was also considered in isolation.

Key Features

  • Hands-on inspection and diving survey adjacent to existing river weir.
  • Ecological constraints, including invasive plant species (Himalayan Balsam) discovered.
  • Archaeological study.
  • Risk assessment needed to consider temporary stability of deck during structural repairs due to extensive loss of cover to rebar and lack of rebar anchorage.
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