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The world's leading magazine for construction, demolition, mining and quarrying industries.

Contractors World  -
2014 Vol 5 No 5
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What's New In Plant & Equipment

Avoid serious risks when reshoring slab formworkAvoid serious risks when reshoring slab formwork

Take a typical case of three slabs being poured in quick succession. Structural planning has stipulated a load bearing capacity that relies on subsequent utilisation of the slab, e.g. 2.0 kN/m² for normal office activity (people, furniture, fittings) that represent the actual load.

The site wants to proceed with the next slab as soon as possible. This generates additional loads on the freshly poured first slab caused by workers, material, activity and the load of the second, new slab itself.

The site management needs to calculate and cater for these risks.

Early stripping with MevaDec

The MevaDec slab formwork system allows early stripping and re­using the panels and beams for the next slab pour right away. This is possible once the concrete has developed sufficient strength to carry its own weight safely.

With MevaDec, this is achieved at 8 N/mm². To remove them, the drop head is released and lowered. Props remain in place to support the freshly poured slab.

If you proceed correctly and adhere to the rules of reshoring, you can save up to 40% of inventory, reduce material and rental costs and simplify logistics.

It is essential to activate the slab’s inherent strength

The slab’s load bearing capacity doesn’t develop automatically, it has to be activated. This is achieved by releasing all the props for a moment and then retensioning them in order to reshore the slab.

By releasing the props, the slab can bend through and develop its required strength. If this is not done, the slab cannot generate its own load bearing capacity fully and is thus not able to carry the load of the slab works above it.

It passes the surplus load down through the props. These may be damaged or bent. Also, the slab could develop cracks, allowing moisture to creep in and cause the rebar to rust.

New MEVA calculation tool for safe reshoringWhen are additional props required?

Additional or auxiliary props are needed when additional loads bear on the freshly poured concrete slab, over and above the slab’s own weight.

This happens when building activity continues on the slab, when material is stored on it or when the next slab above it is poured.

New MEVA calculation tool for safe reshoring

The new MEVA calculation tool for reshoring allows people to work safely and fast when pouring slabs. It calculates the number of props per m² needed to support the slab and carry additional loads on it.

It also shows when props may be overloaded, enabling you to plan workflow to avoid any dangerous risks. The calculator allows you to calculate the fresh concrete pressure, the pour speed for wall formwork systems and the reshoring for slab formwork.

MEVA

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