The project team was challenged to extend the existing down platform by 147 metres to receive longer train stock. The existing structure varies with harps and trestles, all abutting an industrial estate to the rear.
Due to operational issues, no substantial possessions were available and it was necessary to design a solution buildable during short engineering hour closures. Following a detailed topographical and gauging survey by Frankham engineers, the working space was agreed setback from the live tracks with sufficient space to erect a barrier to demark the railway and the construction site.
A number of HV cables were uncovered which were required to be retained and the design developed to construct sleeper walls in blockwork during operational hours on new footings. These were installed at significantly increased centres to allow large RC slabs, designed specially by Frankham engineers to be cast off site and lifted in during the short closure times, incorporating an over-sail block detail. Finishes were then installed partly during possession (copers) and partly during operational hours. Drainage, debris netting, fencing and lighting were redesigned and installed to suit the new slab designs.
A new PWAY access was created and signals relocation accommodated. Scheme was completed in minimum engineering hour shifts, safely and providing a robust and laterally thought out scheme.
- Modular pre-cast concrete construction
- Cross at 10m centres
- Clear spanning panels to maximise positions
- Supported traditional finishes
- 12 car platform completed in 6 nights