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在进行结构吊装时,为了确定吊点位置或验算起吊装置的承受能力,常需要精确计算钢筋砼构件的重量。公认的计算依据是假定钢筋砼的容重为2500kg/m~3,但结果与构件的实际重量常常不符,构件体积越大,误差也越大。这是由于钢筋砼的容重与砼强度及构件含筋率(钢筋体积占构件总体积的百分率)均有一定的关系,表1中的数据可以说明这一点。在施工现场,虽然可以知道构件的砼强度,但含筋率却不易确定,所以无法直接应用表1中的数据。考虑到含筋率与砼强度等级之间一般有一定的关系,因此可将上述数
When the structure is hoisted, in order to determine the position of the hoisting point or check the bearing capacity of the hoisting device, it is often necessary to accurately calculate the weight of the reinforced concrete component. The accepted calculation is based on the assumption that the bulk density of reinforced concrete is 2500 kg/m3, but the result is often inconsistent with the actual weight of the component. The larger the component volume, the greater the error. This is due to the fact that the bulk density of reinforced concrete is related to the strength of crucibles and the ratio of reinforcements (the ratio of reinforcement volume to the total volume of the components). The data in Table 1 can illustrate this point. At the construction site, although the strength of the component can be known, the rib-containing rate is not easily determined, so the data in Table 1 cannot be applied directly. Considering that there is generally a certain relationship between the rate of reinforcement and the strength level of the concrete, the above number can be used.