| 摘要 |
This disclosure is directed to a steel tubular protective structure capable of deflecting and/or resisting impact from falling objects and retaining same and comprising a lower assembly and an upper assembly. The lower assembly is comprised of at least four steel tubular legs positioned between flange-shaped metal feet and steel sleeves and joined by said sleeves to the upper assembly. The upper assembly contains a plurality of substantially parallel tubular steel main structural members defining the length of the tubular protective structure and the external diameter of the downward facing portions of which define the internal diameter of the upper portion of said sleeves. A plurality of tubular steel end cross members join the main structural members near the locations of adjacent pairs of the legs. The upper assembly also includes a plurality of tubular steel intermediate cross members substantially parallel with end members and joined to the main structural members on the inward aspect thereof. Located between these end cross members are one or more secondary tubular steel structural members each of which are substantially parallel to the main structural members and joined to the end cross members and intermediate cross members.
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