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Contractors World INTERNATIONAL - 2016 Vol 7 No 2

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Below-the-Hook Equipment for Bridge Project

Two 70t Modulift spreader beams were integral to the reinstallation of a bridge, lowered back into position by two mobile cranes lifting in tandem.

Swiss crane rental company, Senn AG, used two Liebherrs, each rigged with below-the-hook equipment, to return the refurbished bridge across the Aare river in Bern, Switzerland’s capital.

Oftringen, Switzerland-based Senn is a multifaceted business, which is also a specialist in the provision of steel construction and infrastructure projects. Its scope of work for installation of the bridge in Aarwangen in the north of the city included manufacture and transportation of the steel structure.

Jörg Senn, CEO, Senn AG, explained that the expansive job specification actually simplified selection of the lifting and rigging equipment from the business’s crane and transport department, eliminating the requirement for specifications to be sent to another party, as would typically be the case.

Two big problems remained, however. First, Senn AG had only six weeks to remove the bridge, renew the foundations and replace it; and, second, once the bridge was returned to the site it had to create a stable lift using both the cranes’ outriggers and below-the-hook equipment.

It took four nights to remove the old bridge and four nights to put the new bridge in place. Three Senn AG professionals communicated via radio throughout the project but, Jörg Senn, who expects to complete 20 similar tandem lifts this year, said a comprehensive lift plan was key to safe completion of the job.

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