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Liebherr doubles up for historic installation

Two giant mobile cranes have been used to install a new air-supported cover over a parabolic antenna in Raisting, Bavaria.

Crane specialist BKL used two Liebherr mobile cranes, an LTM 1400-7.1 and an LTM 1100-4.2, for the unusual lift, which involved removing the original cover from the 46-year-old installation and replacing it with a new membrane.

The two-day job began with three workers being lowered onto the crest of the existing membrane to assemble a retaining device for the lifting attachments. The 400t capacity LTM 1400-7.1 then took up the load, and the membrane was cut away from the concrete base, leaving 5,200m2 of protective skin hanging from the crane hook.

When it was erected in the 1960s, the Radom was inflated in an empty state, and the antenna assembled inside.

The new skin was then lifted over the antenna, drawn taut and then bolted to the concrete base, before being refilled with air.

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