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Bridge Strengthening

Techniques to strengthen road and rail bridges include rivet replacement with tension control bolts (TCB's), overplating and stitch bolting with TCB's or welding.  Surfaces are prepared by shot blasting to SA2 or SA2.5.  On fraying surfaces needle gunning is used to achieve a surface finish to ST3. 

Within the UK victorian bridges are prone to deterioration given their age, and techiques to repair include bearing replacement or refurbishment, web stiffener strengthening, top and bottom flange repairs with overplating and installation of TCB's.

Other typical repairs carried out include resin bonded steel plates, shotblasting using wet or dry techiques, working with lead based paints, painting with metal spray or epoxy paints, 

Sewer barrel hanger replacements are carried out.

Jacking and lifting of bridges have been undertaken on a number of bridges, most notably the M6 Thelwall Viaduct.


PCR are certified to the The Register of Qualified Steelwork Contractors Scheme for Bridgeworks (RQSC)

The RQSC allows certified users to work on the following:

  • Bridges made principally from plate girders
  • Bridges made principally from trusswork
  • Bridges with stiffened complex platework (eg in decks, box girders or arch boxes)
  • Cable-supported bridges (eg cable-stayed or suspension) and other major structures (eg 100 metre span)
  • Moving bridges
  • Bridge refurbishment
  • Footbridge and sign gantries
  • Ancillary structures in steel associted with bridges, footbridges or sign gantries (eg grillages, purpose-made temporary works)