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Archive - Four Seasons Trinity Square

The Project

The new Four Seasons’ luxury hotel project at Ten Trinity Square is close to the City and directly across the road from the Tower of London. The Grade II-listed structure was created in 1922. After suffering during the Blitz its fortunes continued to decline until it fell into disrepair in the 1990’s. The intervention of the Four Seasons hotel group has saved a remarkable building for future generations to admire and enjoy.

The Challenge

There were multiple challenges during this project. The initial challenge was to design a system which would enable the maintenance and cleaning of the windows on the inside of the original atrium with no access from the outside to allow the use of MEWP’s. The next challenge was to install the system in a safe and timely manner.

The Solution

To allow abseil access from above and to enable the lifting of glass for replacement windows if necessary from below, it was proposed to have a safety line and series of abseil points running round the ridge of the new roof and a series of davit arm bases with mobile davit arms for lifting any glass replacement based in the gully at the edge of the building.

A series of combined safety line and abseil posts were designed to fix to the underlying steel work which carried the abseil eye-bolts and the safety line around the apex of the roof. This in turn provides the security to access the roof gully at the edge of the building to fit the Davit Arm bases for the Davit Arms. Each Davit arm base is LOLER tested on installation – this service can be provided by Sayfa Systems as we have a LOLER certified test engineer in house.


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