弯曲钢筋的最小直径处应避免弯曲裂缝，并避免在弯曲位置的钢筋混凝土破坏。
P The minimum diameter to which a bar is bent shall be such as to avoid bending cracks in the bar, and to avoid failure of the concrete inside the bend of the bar.
泡沫混凝土层在复合衬砌结构中的最佳位置，外侧钢筋混凝土与内侧钢筋混凝土厚度比大致在1：2左右。
The optimal location of the foam concrete is obtained, and the thickness ratio of outer reinforce concrete to inner is about 1:2.
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