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Bespoke Staircases

Case Studies

Gainsford Street, London

The external spiral staircase for this project near Tower Bridge in London rose over nine metres to create a huge category E public stair. This meant the spiral staircase fire escape we installed could be used by large numbers of people from the building’s office spaces.

This spiral staircase design was challenging geometrically because our design engineers had to ensure that the shape of the spiral and it’s position worked to meet the requirements of the doorway and landing.

Although this was commissioned very much as a functional spiral fire escape stair the size and shape make an imposing feature on the rear corner of The Cooperage office building.

Fire escape spiral staircase
Project:
Gainsford Street, London
Requirement:
Spiral fire escape stairs
Contractor:
CHD Ltd

Steel spiral staircase

This was a huge steel spiral staircase with two landing spaces the second to a set of straight treads.

Like most of our spiral fire escape stairs this one was fabricated in mild steel galvanised to ISO EN1461 and compliant with British Standard BS5395 Part II (Code of Practice for the design of helical and spiral stairs 1984). Galvanising is a cost-effective way of increasing durability and preventing corrosion on exterior spiral staircases.

The staircase balustrade had four uprights per tread fitted to a top rail with black PVC capping.

At a glance

Floor to floor height: 5275mm and 3942mm
Spiral diameter: 2500m
Risers: 21 @ 189.7mm, 28 @ 188.4mm
Tread radius: 41 @ 1250mm
Clear tread width: 1049mm
Tread type: Durbar plate
Balustrade: 4 x 22m diameter uprights per tread with 40mm x 6mm top rail with black PVC capping
Landings: First floor landing: 1265 x 1850mm in durbar plate
Additional: Top of spiral stairs had 5 straight treads @1250mm leading to 2nd landing.
Fire escape spiral staircase
Steel spiral stairs
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