测定混凝土构件的早期强度是困难的。因此,过去对拆模最低令期的规定是保守的。英国新的要求规定,当混凝土强度达到足以克服拆模时所产生的内应力的两倍时,模板可以拆除。这就使模板更有效地得到利用,但还没有达到理想的效果。应力一般是 It is difficult to determine the early strength of a concrete member. Therefore, the past rule on the minimum order period for demoulding was conservative. New British requirements state that the formwork can be dismantled when the strength of the concrete is sufficient to overcome twice the internal stress generated during demolding. This allows the template to be used more effectively, but has not yet achieved the desired effect. The stress is generally