Structural engineer: Arup
Steelwork contractor: Steel & Roofing Systems
Main contractor: P.J. Hegarty & Sons
Client: DiageoOne of Ireland’s most famous and visited tourist attractions, the Gravity Bar that sits atop the Guinness Storehouse, has undergone an expansion in order to accommodate an ever-increasing number of visitors.
In 2018, more than 1.7M tourists visited the Guinness Storehouse, to see how the famous Porter beer is brewed and learn about its history. At the end of their tour, all adults are given a complimentary pint that can be supped in the rooftop Gravity Bar, which is a disc-shaped glazed structure offering 360-degree views over Dublin.
Opened in 2000, the Gravity Bar needed more space and the solution was to build a rooftop extension, which consists of a new steel-framed structure, that links to the existing bar and more than doubles the available floor space. The extension is a disc-shaped structure, connected to the existing bar via new semi-circular structure.
For the construction of the new gravity bar, a crash deck was erected by the main contractor, positioned 1m below the bottom level of the steelwork. This gave the steel erectors a working platform from which to work.
The main steel frame is supported on four CHS columns, which were supported from the existing structure. Before these new columns were installed, the existing Edwardian steel columns below were strengthened with stiffener plates.
The floor of the new bar structure is formed from a grillage of box girder beams and UB section infills.
All UB infills and several of the box girders were detailed with service penetrations to co-ordinate exactly with the M&E requirements. The downpipe from the roof was also integrated inside the CHS perimeter columns in several locations where required.
In summary, the judges say this popular bar sits above Dublin’s most visited tourist attraction and the works were carried out with the building remaining operational throughout. The challenging installation forms an extension to an existing rooftop structure that sits above the 1904 ‘Protected’ building. The new bar is supported on four steel columns that connect through the roof to the strengthened, historic structure, below.
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