钢筋间距应考虑钢筋的放置和混凝土的压实，并且混凝土和钢筋能形成足够的粘结性。
P the spacing of bars shall be such that the concrete can be placed and compacted satisfactorily for the development of adequate bond.
本文通过地质雷达公路隧道衬砌检测的模型试验，研究了地质雷达检测二衬混凝土厚度、二衬中的不同深度，不同间距钢筋以及衬砌模型中的缺陷。
The paper did research on the thickness, depth, different spacing steel, and other bugs in the second concrete lining, through the model experiment of GPR in the highway tunnel lining detection.
本文根据受拉钢筋有效影响区的概念，首先推导出一个平均裂缝间距计算公式。
Based on the concept of the effective affecting area of tensile reinforcement, in this paper, a calculating formula of average crack distance is set up first.
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