PhotographRail overbridge, composite plate girders, Uttar Pradesh. The completed structure in service.photography/project-rob-composite-girder-fabrication.jpg
Scope of supply
- Design check, fabrication and coating
- Full trial assembly at Butibori
- Strand jack erection over live track
- Site welding and NDT
Divisions involved
01
The problem
The crossing is over four electrified running lines with a four-hour traffic block available once a fortnight. Every girder had to go in complete, first time, with no possibility of adjustment under the wire.
02
What we did
All spans were trial-assembled in the works and dimensionally surveyed against the model before coating, so fit-up was proven before anything shipped. Erection used synchronised strand jacks from temporary towers outside the danger zone, with the lift sequence rehearsed dry in daylight the week before each block.
03
What happened
Fourteen consecutive blocks used, none overrun. No site rework on fit-up; measured bearing seating was within 4 mm of theoretical on every span.
Measured outcome
- 3,400 t
- Steel fabricated
- 68 m
- Longest girder
- 14 × 4 hours
- Erection blocks
- EXC3
- Execution class