Traffic is banned from Zermatt, a town on the Mt. Matterhorn in the Swiss Alps. Visitors must park their vehicles 5 km outside of town and use the shuttle. Only residents with special permits are allowed to drive as far as the town border and park their car in purchased parking lots. These are rare, which is why the new Vispa parking facility is being built – a 3 level, 70 by 35 m parking house with a rectangular layout and space for 300 cars. It is being built in a former construction pit, its roof in part level with the surrounding terrain.
A challenge for design, planning, logistics and work flow
The topography and extended winters make building in the Alps difficult as a matter of course. On top of this, the Vispa projects requires wall and slab pours to follow an exact sequence due to the offset footprint. In addition, site logistics has rely on as few truckloads for material as possible, because they require a special permit. The formwork itself has to be hand-set, sturdy, easy to handle and quick to set up, space saving and reliable.
AluStar and StarTec used to pour foundations, 30 to 80 cm thick
The foundation plate varies in thickness depending on the ground water pressure which increases as you near the mountain. The foundation is being poured using lying AluStar and StarTec panels. Both can be combined with one another and all lengths are achieved without time-consuming wooden fillers. The schedule is tight.
Perimeters formed with support frame and no extensions
The 2.50 m high perimeter walls demand single-sided forms, achieved using 2.70 m high StarTec panels, filler areas being bridged with narrow AluStar panels. MEVA’s support frame STB 300 proved ideal for the singlesided pours. Before each pour, an insulation layer must be in place to cater for high ground water pressure.
> 6 000 m² slabs in 18 cycles
The 28 cm slabs of the parking house are being poured using the MevaDec slab system. More than 1 000 m² per wing are divided into 3 pours, one each day. The slab sections are tilted at angles between 2° and 4°. MevaDec allows for this without any additional measures thanks to leeway between primary beams and drop head.
„We’re stripping the slab forms after 3 days, not 10 as calculated”, says site manager Sven Sarbach. As soon as the concrete has reached a strength of 8 N/mm², panels and beams can be removed in early stripping and re-used for the next pour. This is done after 2 to 3 days, depending on the weather. This is 70 % faster than the planning engineers had forecasted. “It also means that we have less inventory on the site, saving space and logistics.” “We’re very satisfied, as we were with the polygonal layout of the StarTec panels on the parking house opposite”, says supervisor Sandro Pianezze. “I’ve been working with MEVA formwork for years now and I can confirm that we’ve also found top answers and top level engineering to the forming challenges at hand. The support is very good.“
Safety is a number one priority. The editors’ site viewing tour was interrupted by an unannounced visit of the Swiss construction safety inspectors. They had little to do and left after a short while. All safety precautions and worker safety measures were in place.
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