Epoxy Resin Crack Injection
Wimbledon Train Maintenance Depot
Client: Stagecoach South Western Trains
Contractor: Geoffrey Osborne Ltd
Engineer: Frankham Consultancy Group
Works Commenced: July 2017
Wimbledon Train Maintenance Depot services the train fleet for South West Trains. The facility was built in the early 20th Century with mass concrete walls, which were repaired in the 1970s with additional reinforcement installed to prevent cracking induced from the rail shoes.
The concrete walls measured approximately 250m long, 1130mm high by 460mm wide. Cracks had appeared in both walls, visible on the inner and outer faces and a central vertical crack was also found in some locations.
Our repair package included:
- Removing a band of render (saw cutting to form a neat edge) to gain access to the surface of the structural crack,
- Drilling and fixing injection packers at approximately 300mm centres to intersect the crack,
- Sealing the crack surface with TamRez 310 putty,
- Injecting cracks with TamRez 220 epoxy resin,
- Re-applying render,
- Applying concrete repairs using Renderoc HB repair mortar,
- Repainting with three-coat Pumacoat system.
- A total of 1150 linear metres of cracks up to 5mm wide were injected.
The works programme was planned in three phases to accommodate the continuing train maintenance schedules and took a total of nine weeks.