Bell Access & Engineering Ltd worked closely with STORY Contracting & Network Rail to provide a solution for a challenging work site. The aim was to minimise disruption while gaining access across the viaduct, the environmental challenges included operating in a steep sided gorge, crossing rivers & public access foot paths and keeping noise to a minimum while working close to local housing.
To minimise disrupting rail traffic and to ease access throughout the structure a cable system was installed to allow cradle access to all piers, span walls and arch barrels. The initial program involved working in the hours of darkness to diamond core 220no. 32x2000mm vertical cores to stabilise the structures parapet wall.
Further drilling on this project included:
- 112no. 24x1200mm diamond core holes – for the installation of 16x1300mm anchors that form the cradle system
- 230no. 32x1550mm vertical core holes – for the installation of M24 stainless all thread bar
- 192m of structural fractures cross stitched with 6mm stainless rebar – approx. 400no. 10x600mm