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Two 10-tonne SWL ABUS overhead travelling cranes were involved in an operation to reface the stonework of the British Museum in London.

The initial problem had appeared to be the handling of the large pieces of masonry to high level.

With space at a premium in Central London and hence the few site cranes in constant demand by the many onsite contractors involved with the project, Easton Masonry approached ABUS Crane Systems for two overhead travelling cranes mounted to the top of a specially designed gantry scaffold on the face of the museum.

One crane had the role of feeding stones on to the loading gantry and the second crane was designed for accurate fixing of the fluted column nosing.

This allowed the masonry contractor an all-important independent lifting source, as the final positioning of the large stones could be a lengthy process due to the accuracy required.

The joints between the massive stones are measured in fractions of millimetres.

Although ABUS Cranes are supplied as standard with a main speed and a much slower precision speed on all motions, it was decided that this operation required even more precise handling.

The ABUS ABUliner variable speed controller was fitted to the hoist of one of the cranes to allow the extremely exact positioning of the very heavy and expensive pieces of masonry.

The ABUliner not only allows the speed of the motor to be continuously variable, but it also has a very low minimum speed for sensitive operations and its smooth performance virtually eliminates load bounce or swing and extends the useful life of the cranes motors and support structures.

The ABUS Cranes were also weatherproofed against the changeable London weather and given a durable outdoor paint finish.

ABUS Crane Systems

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