采用型钢焊接的框架结构，两侧有安全护网，带支撑挂耳固定在链条上。
Frame is sectional steel design with two lateral safety grids. Supporting angles are fixed on bush roller chains.
球网应以一条绑在两侧网柱高15。 25公分处的悬网绳挂之，网柱外缘须离边线外15。 25公分。
The net shall be suspended by a cord attached at each end to an upright post15.25cm high the outside limits of the post being15.25cm outside the side line .
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