Refurbishment of bridge over A6 in Derbyshire

 

Working as specialist sub-contractors on the Highways Agency Area 7 MAC, Topbond recently completed the refurbishment of Elvaston Lane Bridge.thumb elvaston4

The bridge is a single 42m span steel structure carrying a 3.6m wide equestrian, pedestrian and cycleway route over A6 Alvaston Bypass, Derby. The steel deck plates were finished with a 3 element waterproofing / surfacing system comprising slurry resin, 30mm thick layer of Mastic Asphalt and High Friction Surfacing [thermoplastic]. De-bonding of the mastic asphalt from the slurry resin had occurred causing blisters to form on the bridge surface, presenting trip and other safety hazards to all users. It was also feared that this could in turn lead to the deterioration of the steel deck plates and supporting members if the defects were not addressed.

The following repair scheme was therefore agreed:

  • Removal of mastic asphalt surfacing.
  • Installation of through deck drainage.
  • Repairs to existing bridge deck waterproofing.
  • Installation of rubberised tiling system.
  • Bridleway surfacing regulating.
  • Installation of galvanised steel drainage channels and down pipes, including access requirements.
  • Installation of PCC channels.

A rubberised tiling system was chosen in preference to the existing surfacing because of its hard wearing, non-slip properties. Testing was undertaken prior to tile installation to ensure compatibility between the tile adhesive and the waterproofing system.

The bridge was closed during the refurbishment works and temporary diversions put in place, with the drainage works on the revetments undertaken during partial night-time closures.