The Technique of Early Striking
Early striking is a technique whereby the formwork is removed three to four days after pouring a slab, but the supporting structure of scaffolding or props remains undisturbed until the concrete is strong enough to support its own weight over its full span. Concrete generally takes 28 days to attain its full constructional design strength. Most engineers will only permit the complete support to be removed after about 10 to 14 days, depending on the ambient temperature and cube strength tests.With today’s high costs of formwork it is important to use it as frequently as possible. Traditional formwork locked in situation for 10 to 14 days with a pouring cycle in excess of this is outmoded by the F-Lock early striking system and its facility to speed the cycle of operations. This practice has been widely accepted especially as the rising costs of materials and labour have proved that the early striking is safe efficient and cost-effective.How it is set
A complete set of F-Lock Decking and support is used for the first floor slab. After three to four days of pouring the concrete, the infills and decking beams may be struck for re-use on the second floor slab while support remains in place during the rest of the curing period. In practice, it is found that support around columns. close to walls and beams can be removed. About 1/3 of these are free for re-use. Additionally, about 2/3 of support will be required for the second floor. After pouring the second floor, the formwork may be removed after three to four days.