Canary Wharf one of the largest Crossrail stations built in the North Dock water area of West India Quay.
Client: Laing O’Rourke
Contract Value: £473,000
Our contract comprised of the fabrication & installation of ship protection fenders and a ‘U’ Tube for underwater cables at the new Canary Wharf Station.
The fenders comprised of a steel gridded support system fixed to cast in sockets on the wharf wall, on which timber buffers were attached to stop the ships damaging the wall and ultimately Canary Wharf Station. To ensure the design worked within the site constraints special asymmetrical section profiles were manufactured from plate steel and a special blind bolt system was developed to ensure erection from the floating pontoons was possible. The fabrication was made even more complicated as the grid system and timber verticals needed to tie in with the vertical hand railing positions on the wharf above.
The requirement of getting cables underwater from the dock to the Station building was overcome by the provision of a 20m high x 10.3m wide ‘U’ Tube. The complexity of the design required the tube to:
- Be spliced and faceted to achieve the required bend and to keep its shape when split in half along its length, allowing conduits and rebar to be laid in before re-sealing
- Be part filled with concrete to allow the full profile to sink in the water, but not too much that the crane couldn’t lift it.
The 1200 diameter tube was designed with square stiffeners at 1500 centres ensuring that each half of the tube maintained its shape when cut along its length and also remained level and stable throughout the process from manufacture to site.