Long-standing Liebherr customer Bernard Hunter has used two machines from its fleet to dismantle the trio of Liebherr tower cranes that dominated the skyline during construction of the Queensferry Crossing.
The Edinburgh hirer won the contract from Forth Crossing Bridge Constructors (FCBC) to take down the identical 40-tonne cranes that were used to build the three 207-metre high towers supporting the bridge. The 2.7 km long structure, due to open this summer, is the world’s longest cable-stayed bridge with three towers.
Hunter deployed an LTM1500-8.1 – its biggest mobile telescopic – with a 35-metre fixed fly jib to remove the tower cranes’ tie bars from the bridge structure and it was lifting five tonnes at a 57-metre radius and 90-metre hook height. The same machine went on to remove the jib sections, head, cabin and slew assembly.
An LTM 1300-6.1 mobile crane was also in action, removing counter jibs, hoist unit frames and counterweight ballast blocks. It was handling 22.2 tonnes at a 22-metre radius and a hook height of 55 metres.
Established in 1946, Hunter is involved in crane hire, metal processing and recycling, and machinery movement and is managed by the third generation of the family. Its current fleet of 18 cranes includes 11 Liebherrs and its recent investment in LTM models is worth around £6m.
Chairman Jim Rafferty said a key factor in the recent purchase of the 300-tonne LTM 1300-6.1 and 500-tonne LTM 1500-8.1 was the additional investment in the optional Liebherr steel-fabricated mats which came from the factory with the relevant calculations demonstrating the load-bearing capabilities inherent in their design. The calculations were “extremely useful” in demonstrating to FCBC that the mats were right for the job.
Article posted 9/6/2017
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