LSJ Engineering was commissioned by Stoneforce to build a vertical extension in Cowcross Street, London, in September 2018.
- Client: Stoneforce
- Structural detail by: Mark Ebbs
- Job Duration: September 2018-January 2020
This was another vertical extension, in Farringdon, central London.
We supplied and erected a two story extension on top of a building that was already three stories high. As the building had to have its roof removed to do the works, the main contractor had to put a full scaffold lid on it making it very difficult to erect the frame with a mobile crane.
Instead, we were provided with a hoist to get all the steel sections to roof level, and we erected the frame using Genie lifts and gantry frames for the heavier sections.
On the same contract, we supplied and fitted an unusual cantilevered staircase from the basement level to ground floor.
The stair flight was formed of continuous 20mm steel plate treads and risers with non-slip nosing strip slots milled into the treads.
The whole stair cantilevered off a concrete wall, a stud wall was built a few inches in front of it to hide the fixing points, and the treads and risers were fully welded together.
As there was some welding and grinding involved in the fitting process, the stair was painted on site.