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Sat 12 May 2007 12:00 AM

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Meva improves MAC for crane-free jacking

Formwork specialist Meva has introduced its updated ‘open end' MAC climbing system for high-rise buildings.

Formwork specialist Meva has introduced its updated ‘open end' MAC climbing system for high-rise buildings. According to the company, it works without the need for cranes.

The automatic climbing formwork is pushed by a hydraulic system. The platforms and safety enclosure are moved by a maximum of 4m from level to level, slowly and evenly, and steered via remote control. The lift from one level to the next takes approximately 30 minutes.

Climbing is performed without any crane support, thus making the system safe for even high wind speeds at great heights. There are no guides or climbing rails and the system works without intermediary anchoring.

Several safety features also distinguish the MAC system from others, according to Meva. A fully clad and enclosed working area provides for safe and comfortable working conditions, regardless of the weather. And non-return valves, a complete backup hydraulic system as well as non-return ratchet locks on each ram, are integrated.

The entire MAC superstructure is supported by independent structural members installed between the shear key beam and the grid work. There is no reliance on the most recent concrete pour: the jacking beams are supported by concrete that has already set and the structure can be lifted a day after pouring.

Both the jacking beam and the shear key beam fit into one and the same pocket. This brings speed and flexibility. Premoulded pockets are placed into each newly constructed section of a building's central core to provide support positions for shear key and jacking beams. The pocket moulds are removable after jacking and can be re-used. The top deck is free of jacking masts and other mechanical obstacles, protecting all operational equipment from concrete spills and possible crane damage. The upper level matrix of beams support the upper deck, working platform and cladding as well as all external and internal rolling shutters.

Long-stroke, heavy-duty hydraulic rams placed between the jacking beam and the grid work raise the entire superstructure upward as well as levelling it - the number of rams varies with the size and complexity of the central core's design.

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