Harsco Infrastructure, Self-erecting tower crane

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Self-erecting tower crane
December 1st 2007

An AT7 mobile, self-erecting tower crane has been used to lift an SGB scaffold beam bridge structure at Gatwick's South Terminal. The bridge weighs 6t and SGB believes the AT7 to be the only crane in the UK which can lift such a structure due to restrictions on conventional mobile crane operations so close to the flight path.

The crane can reach heights in excess of 50m and lift weights of 5500kg at a radius of 42m. However, the maximum crane working height could not exceed 36m due to aircraft flight path restrictions, but still needed to lift 6000kg at a radius of 32m over a 25m tall building.

The SGB bridge, built from Coverspan alloy beams, was designed to create a box beam that would allow installation and movement of structural steel and carry a 2t air handling unit. It is 21 by 4.2m and is supported by the South Terminal roof at one end and by a freestanding scaffold support tower at the other.

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