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Innovative jacking solution saves time and space during roof lift, USA






Optimised space

Co-ordination with third parties



ALE’s ability to provide innovative and specially-tailored heavylifting solutions enabled them to provide an alternative lifting solution to raise a roof section, weighing 400t (441 US t), for an amphitheatre in Milwaukee, USA.

There was minimal space available at the site, so ALE devised a jacking solution using eight strand jacks to lift a section of the roof. Utilising their global resources and engineering expertise, ALE modified existing beams to specially adapt them for use as outrigger beams on the heavylifting project. The strand jacks operated simultaneously to gradually lift the roof section to a height of almost 20m (65 ft).

One unexpected challenge on the project was the weather, which was more severe than usual for the area. Temperatures fell to -30°C (-22°F) overnight and temporarily prevented the client from continuing welding work. ALE’s solution enabled the roof section to be securely held in place, with the weight supported for almost two weeks – three times longer than originally planned – before the swift lifting operation was completed.

ALE worked closely with the client, who supplied the supporting structure for the operation, and regular co-ordination meetings ensured smooth communication between the project’s various contractors.

As ALE’s innovative jacking solution required less equipment than other techniques, it had a smaller footprint and this alternative lifting method also enabled the roof section to be lifted quicker, minimising the impact on other simultaneous operations.

The roof lift is part of a series of renovations that will increase the amphitheatre’s capacity so that the venue can produce more complex shows for larger audiences.

Watch ALE’s alternative lifting solution raise the roof

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