A marshy riverbank, little space and even less time: a special challenge for the Nordic heavy-lift contractor Havator and its Terex Demag CC6800 crane. The task - to replace a railway bridge over the Nyköpingsån river, some 120 km south of Stockholm. The requirement - to ensure that use of the railway can recommence as quickly as possible. In normal circumstances the line would need to be closed for more than a month, but use of the Terex Demag CC 6800 lattice boom crane with 1250t lifting capacity reduced the period to less than a week.
The Terex Demag CC6800 crane was erected in the pedestal crane version (PC) - with star-type outriggers instead of crawler tracks.
Havator has purchased the Terex Demag CC6800 with 96m main boom, 108m luffing fly jib, Superlift and a modular hook block system with a multitude of possible variations.
Lifting out the old 200-tonne bridge was an easy job - by way of a warm-up, one might say, compared with what Havator's self-propelled modular trailers (SPMT) brought along the narrow access road. The new bridge with a live weight of 320 tonnes was positioned close to the crane. The contract specified that the new bridge had to be lifted off the flatbed trailers at noon on Monday, 11th August. Thanks to extensive preparations and the professional Havator team, the bridge was lifted two hours ahead of time.
The crane was configured with a 60m main boom and Superlift with 400t Superlift counterweight.
The Superlift radius was 24m; the stabilizer base measured a compact 14 x 14m. The bridge had to be set in place exactly on a load radius of 36.5m; it was rigged to the hook with a system of spreaders bars. With this configuration and radius the maximum lifting capacity is 367t. Crane operator Krister Enarsson carried out his first lift with the new crane with great skill, since he already has experience with other Terex Demag lattice boom cranes. Havator operates, among others, a Terex Demag CC2200, a Terex Demag TC2800-1 and several Terex Demag CC2800-1s.
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Terex Demag GmbH is based Zweibrücken, Germany. www.terex.com
