论文部分内容阅读
一、研究目的规范中规定,当混凝土的灌注间歇时间超过两小时以上时,须待混凝土强度获得12kg/cm~2以上之后,才能接灌新的混凝土。但隧道混凝土衬砌往往由于坍方及撤换支撑等原因,既无法使混凝土连续灌注,又不能等到混凝土的强度达到12kg/cm~2以上之后再接灌新的混凝土。我处已往对上述问题的处理,一般作法都是先处理坍方,而没有受混凝土灌注间歇时间的约束。有时为了满足规范的要求,就在
First, the purpose of the study specification provides that when the concrete pouring intermittent time more than two hours, to be concrete strength to be 12kg / cm ~ 2 or more before they can pick up the new concrete. However, the concrete lining of tunnels is often unable to continuously pour concrete due to collapse and replacement support, and can not wait for the concrete strength to reach 12kg / cm ~ 2 and then pour new concrete. It has been our practice in the past to deal with the above problems. It is common practice to deal with landslides first, without being bound by the intermittent time of concrete pouring. Sometimes in order to meet the requirements of the norms, right here