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Page 13 Contractors World - UK & Ireland Vol 2 No 2

architecture are more and more challenging. Contractors have to devise innovatve solutons and provide expert advice to accompany their projects on a daily basis from planning to fnish.

For the Terex Tower Crane Application Engineering team working with Select, meant visits to the jobsite, regular contact and mutual confidence have been paramount to tackle the Shard’s unique challenges. “One of the most tried and trusted solutions applied in today’s high-rise building sector involves the use of reinforced steel ties to anchor cranes to a building’s core,” says Francesco Valente, Tower Crane Applicaton Engineering Manager.

On traditional high-rise construction projects, ties are generally of a standard size. However, shaped like a prism, The Shard is very broad at the base, growing substantially narrower towards the summit. This results in an increasingly wider distance between the cranes’ centre-line and the building’s core. Consequently, creating a special solution adapted to the tower ’s unusual shape and extreme dimensions was necessary in specific crane configurations beyond a certain height.

Innovative solution to crane ties

“Select came up with a really impressive “Mega-te” system,” says Valente. “Built using 20 m-long lattice steel structures made by an experienced local UK engineering team, they asked us to cross verify that it could withstand wind forces and the weight of the crane under load safely.”

The f i rst and heaviest crane models used on the project were two Terex CTL 400-24 luffing jib tower cranes confgured with 40 m (131.2 f) and 50 m (164 f) jib lengths to lif prefabricated concrete and steel components weighing up to 19.5 tonnes The first crane was mounted on a steel cantilever structure and erected to a final height of 186 metres. The second unit was erected to a fnal height of 132 metres on reinforced concrete foundations and anchored with a “Mega-te” at 93 metres.

Verifying crane erection and dismantling processes, checking the “mega tie” system to be anchored to the building’s core and calculatng the combined impact of heavy lifing and wind forces have all been part of the wide variety of complex calculatons and verifcatons carried out by the applicaton engineering team on The Shard project.

The highest crane used in the UK lifts final tower pinnacle

Six months from structural completion, one of the most impressive solutions employed on the jobsite is the use of an 84 m high CTL 180-16, erected 200 metres above ground level on a gigantic steel framework. The crane has been jumped into place and sits at floor 56 to enable work on The Shard’s final spire where it will lift 500 tonnes of steel

Photo: Aurelien Guichard

The frst crane was mounted on a steel cantlever structure and erected to a fnal height of 186 m. The second unit was erected to a fnal height of 132 m on reinforced concrete foundatons and anchored with a “Mega-te” at 93 m.

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