en.Wedoany.com Reported - The renovation of the 1 Victoria Street office building in the core of Westminster, London, UK, advances a large-scale refurbishment project in one of the UK's most constrained urban environments through innovative engineering and meticulous planning. The project is supported by key contributions from professional tower crane manufacturer Wolffkran, with contractors Keltbray and Mace Construct executing an ambitious redevelopment plan that focuses on retaining most of the existing structure of this iconic 1960s office building.
Rather than demolishing and rebuilding the entire structure, the renovation scheme preserves the main parts of the original building, thereby avoiding extensive new piling and foundation work and reducing embodied carbon. This sustainable approach presents a unique set of engineering challenges. Due to the retention of the original foundations, tower cranes are installed in the basement on the foundations of a building structure over 60 years old, requiring a fully customized lifting strategy where crane positions are dictated by the existing structural layout rather than following conventional construction practices.
The project is carefully phased, utilizing a total of nine Wolffkran tower cranes to support demolition and construction activities. During the initial demolition phase, a Wolff 355 B luffing jib crane handles heavy lifting operations within the constrained site, including excavators, structural steel, and demolition equipment. As construction progresses, four additional cranes are subsequently installed to support the construction of the building's reinforced concrete core and early superstructure, including slipform processes requiring continuous concrete pouring and highly coordinated lifting operations.
One of the most technically challenging aspects of the project is adapting the cranes to the retained foundations. Wolffkran's adjustable cross-frame system allows each crane to be precisely aligned with existing structural support points, with each support leg configured to different lengths to accommodate the complex underground geometry. Engineering challenges will persist through the final stages of the project. Once the basement floor slabs around the crane bases are completed, dismantling the equipment requires carefully planned operations using ceiling hoists, specialized forklifts, and slide plate systems, as conventional mobile cranes cannot access the completed structure. Later this year, as the next construction phase begins, lifting operations will shift to the roof level, where larger luffing jib cranes will be used to support the installation of upper floor slabs, facades, and building equipment.
The renovation of 1 Victoria Street is scheduled for completion in early 2028 and is expected to be one of the most technically demanding refurbishment projects in central London, demonstrating how innovative construction techniques and specialized engineering can achieve sustainable renewal while preserving existing building assets.
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