角柱冲切破坏锥体近似1/4圆台体，边柱冲切破坏锥体近似1/2圆台体，中柱冲切破坏锥体为一个完整的圆台体。

The punching failure cone of comer column is approximately 1/4 round estrade, that of border column is approximately 1/2 round estrade and that of center column is completely one round estrade.

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所述圆台的任一边沿与圆柱套体相贯部位切去以形成一直边。

Any side of the circular table is cut along the penetrating part with the cylinder bushing body for forming a straight side.

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