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本文介绍了钢板、水泥双层蜗壳和三夹层蜗壳的模型试验结果。双层蜗壳试验指出,在同样的内压作用下,内层钢蜗壳的最大边界应力由于外层钢筋混凝土的工作,减小约20～25％;层间压力分布近似于余弦曲线。在此基础上,作者提出了计算双层蜗壳的近似方法。在三夹层蜗壳的试验中,测量了内外层钢板的应力,发现这种结构不仅在工艺上有其特点,而且能在很大程度上消除蜗壳边界的应力高峯。
This paper introduces the model test results of the steel plate, the double-layer cement-cement scroll casing and the three-stage spiral casing. The double-layer volute test shows that under the same internal pressure, the maximum boundary stress of the inner steel spiral case is reduced by 20-25% due to the work of the outer reinforced concrete. The pressure distribution in the layer is similar to the cosine curve. On this basis, the author proposed an approximate method for calculating double-layer volute. In the experiment of three sandwich volute, the stress of inner and outer steel plates was measured and found that this structure not only has its characteristics in the process, but also can largely eliminate the stress peak of the volute boundary.