During the construction work, before the introduction of any concrete, the timber beams must be supported - otherwise the weight of the concrete may lead to excessive sag.
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Support or suspend?
Once the span exceeds 3 metres, t is advisable to support the timber beam ceilings from below as protection during concreting. Once the concrete has reached 80% of its ultimate strength, the supports may be removed. The period of time for which supports need to remain depends on the recipe used for the concrete mix and the ambient temperature. The normal time is of the order of 28 days. If bracing from below is not an option, we can offer a proven solution which involves suspension of the beams. Jointly with a Swedish manufacturer of tensioning systems we have developed and protected an innovative and economical solution for this purpose. This has been successfully used on a number of sites. A transversally tensioned heavy duty girder is preloaded on a tensioning device which simulates a loading of exactly 450 kg/m². This is then suspended from above during the construction period in a separate lattice structure.