Rail Bridge preservation, restoration and strengthening at the Old Rectory Rail Bridge, Withington
Masonry rail bridge restoration
The arched Old Rectory railway bridge in Withington supports the old track bed of an abandoned branch line. The railway passes over a right of way footpath.
The original arch was found in a state of near collapse and the footpath was closed.
Our arch specialists determined that with careful temporary propping, removal of the most unstable section of the outer ring of the barrel, the remainder could be pinned back and strengthened using Helifix CemTies. Once stabilised the missing sections of ring could be re-cased and pinned into position using a combination of Helifix CemTies and ResiTies. The old arch was fully repointed in heritage lime mortar and then drilled at regular centres in order to carry out installation of the iGAP system. The unique combination of Helifix Dryfix arch pins and Normet’s Tampur150 polyurethane resin both strengthens the arch and provides comprehensive water control preventing percolation of rain water from the track bed. Normet TAM PUR150 was pumped into the arch through the injection points to fill all the gaps and areas of washed out mortar and provide the arch with a water control capability.
Our solution not only saved the original arch but reduced both the project period and the overall refurbishment cost to the client by more than 50%.
Our experience in bridge restoration
- 200+ UK arches restored using MARS system
- Increased strength with no excessive stiffness
- Improved structural behaviour
- No unsightly external plates
- Original characteristics retained