Burnley Tunnel Retrofit Solution


Conventional ductile iron access covers & frames corrode in highly aggressive environments. Corroded & heavy access covers are difficult, time consuming and potentially dangerous to access.

High maintenance costs, tunnel closes only a few times a year for maintenance, time is of the essences. Heavy covers (<200kg),


Non corrosive access covers that can be opened quickly, reliably and safely. Lockable, lightweight, meet Stringent Fire & Smoke Resistance Standards in tunnels


  • Terra Firma ThruBeam E-Class composite frame and access cover
  • Terra Firma E400 composite range will not crack, warp, chip, swell or expand
  • Chemical, diesel, petrol, water and salt resistant
  • Cover weighs only 29kgs
  • NATA tested to AS3996 Class E (400kN)
  • AASHTO and European EN 124 D400 regulations