LSJ were appointed by LTB to design a basement to ground floor steel staircase at a new WeWork office just south of Blackfriars Bridge in London.
- Client: LTB
- Structural detail by: Mark Ebbs
- Job Date: December 2020
The staircase was to span over 9m without support posts. This would normally be achieved by using an off the shelf structural steel section such as channel or box section. However, the stringer had to look as slim as possible and no wider than the balustrade bolted to it. We achieved this by fabricating a hollow box section from 15mm plates welded together to make a section size of 400mm x 75mm.
The plates had to be fully welded together to give the strength and the welds also to be ground flat achieve a clean look.
To allow delivery, each stringer was made in two sections and spliced back together on site before erecting. Here is the staircase in our workshop:
Each stringer, once assembled, weighed over 800kgs! We had to take great care to avoid damaging the finishes. The stringers were erected using Roustabout lifting gear.
The balustrade bolted directly to the top of each stringer and had to fit perfectly, so we assembled the stair and made the balustrades on the stringers at our workshop before dismantling all and sending to be powder coated by Mulberry and Pier.
Along with a raised floor area and ramp balustrade on the ground floor in the same style, the works were delivered and completed in plenty of time before handover with minimal touching up of the paintwork. What do you think of the finished staircase?