Dec. /10 - VETTER Krantechnik

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Juggling with concrete sections Turning a precast concrete section using two 20-tonne ROTOMAX® load-turning devices 12 Lift it December 2010 Manoeuvring precast concrete sections safely and in less time: Dutch company, Beton Son B.V., has substantially improved and speeded up the handling process during production of its precast concrete sections with ROTOMAX® load-turning devices from VETTER.
Betonson produces precast concrete sections for motorway construction consisting of a hard layer and a soft layer of concrete. During production, the hard concrete is first poured into the mould, followed by the soft concrete. As later on the hard layer has to be laid facing up on the motorway to form the driving surface, the slabs need to be turned. Previously, the up to 35-tonne slabs had to be raised and turned using two hoists – a very dangerous manoeuvre in which it was not uncommon for the expensive slabs to be damaged. Then the concrete manufacturer found out about VETTER, and together a solution was developed that was both safe and time-saving. Responsive turning and safe control Two load-turning devices, each with a lifting capacity of 20 tonnes, are suspended in the exis- The loaned device with a 20 tonne lifting capacity ting gantry crane on two hoists. The load-turning devices are operated via radio control which also controls the tandem operation to enable both devices to work in sync. This provides for responsiveness when turning the up to five metres wide concrete slabs. This impressive manoeuvre is controlled by just one person from a safe distance. The concrete slabs are held in two special slings which have a coating with a high friction coefficient and a high degree of cutting and non-skid resistance. Danger of tipping minimised The wide dimensional range of the slabs presented a challenge. Slabs of 150 – 450 mm in thickness had to be turned. The width of the slabs and the given minimal lifting height of the gantry crane can result in a very wide splay angle for the slings on the driving rollers. This angle is restricted by individually adjustable counterpressure rollers ROTOMAX® lOAD-TURnInG DEVICES so that during the turning procedure the slabs cannot be tipped in a jerky, uncontrolled manner. Reliable service A special service provided by VETTER was the loan of a device to bridge the delivery time, allowing Betonson to meet the high demand even during the leadtime. bert.vandenbril@vetter-cranes.com Beton Son B.V. l Headquarters: Son, netherlands l Has produced precast concrete components for over 50 years l Full service partner for the manufacture, delivery and installation of prestressed precast concrete floors, prestressed prefabricated floors and pile foundations www.betonson.com December 2010 Lift it 13
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Dec. /10 - VETTER Krantechnik

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