CitizenM Hotel, Tower Hill

Image - Paulina Sobzcat

Image - Paulina Sobzcat

Contact

Mike Mittendorfer. Ramboll

Mike Mittendorfer

Associate, Buildings
T: +44 7896 748 883
M: +44 7896 748 883
Ramboll. Andrew Mather.

Andrew Mather

Principal Structural Engineer
T: +44 7929 057 019

New hotel adjacent to Tower of London

Providing structural, geotechnical and civil engineering design services, Ramboll supported the project from inception to completion and worked with the client and then the contractor through the detail design stage. Located within a UNESCO world heritage site, CitizenM Tower Hill interfaces with the original Roman City Wall and Tower Hill Underground station. A critical component of the project’s success was the management of the existing site’s assets, requiring close liaison with other key stakeholders including English Heritage and London Underground.

Offsite construction

Offsite construction was integral to this successful conversion from a five storey 1960’s office block to a nine storey hotel. Providing lightweight construction, modular steel pods enabled Ramboll to design a solution that ensured the new load paths from the hotel compared favourably with the former loads from the office and the capacity of the existing station structure.

Not only did modular steel pod construction facilitate the addition of a further four storeys to the hotel, it made it possible for the architect to include Portland stone cladding on the façade (a requirement only stipulated at the planning approval stage). This sympathetic addition ensured the hotel would complement its surrounding environment – an important consideration for the planning authority.

Bringing speed and assured quality to the construction, the modules were manufactured, fully fitted and sealed in Poland. Stored offsite in the Port of London dockyards, they were brought into the City and placed in situ overnight.

Over 3½ months, the 370 modules were typically installed at a rate of eight units per night, with the facility to install up to 14 units. The overnight installation programme minimised disruption to London’s busy streets. The modular steel solution significantly reduced site waste and consequential environmental impacts from the construction. This offsite constructionmethod reduced the workforce needed on this very confined city site, made for a safer working environment onsite and reduced impact on local city workers and tourists.

Vibration isolation

Meeting the client brief to ensure a sound night’s sleep for its guests, Ramboll identified the need to isolate vibrations from the underground lines beneath. Our advanced engineering team developed a strategy for achieving this without significantly affecting the architect’s design.

Interface with Underground station

The interface with the London Underground station married offsite construction above ground with traditional construction techniques below. As part of the development agreement with London Underground, we designed new step free access to the station. There are two ticket offices, one under the new hotel and the other reached through a separate building to the south. Each location has a new lift and stair access from platform to ground level. The new step free access required Ramboll to find routes through the existing station structure, minimising passenger impact and allowing the station to remain in operation during the installation works.

Ramboll

Ramboll
240 Blackfriars Road
London SE1 8NW
United Kingdom
Tel:+44 20 7631 5291
Fax:+44 845 299 1610

Mail: london@ramboll.co.uk

Company registration

Company registration

Ramboll UK Limited. Registered in England & Wales. Company registration no. 03659970. Registered office: 240 Blackfriars Road, London SE1 8NW


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