| 摘要 |
An equilateral derrick structure such as for use in erecting chimneys and the like, wherein a plurality of horizontal members, upright diagonal brace members, and vertical column members are interconnected by a plurality of connectors to provide a desired three-dimensional framework derrick. The horizontal members may define a first kind of structural element, the brace members may define a second kind of structural element differing from the first kind, and the column members may define a third kind of structural element differing from each of the first and second kinds. The connectors may be formed as unitary members having a center portion defining a right circularly cylindrical hole for receiving corresponding right circularly cylindrical column members. The connectors may further define outwardly projecting flanges for connection of the horizontal members and diagonal brace members thereto. The connectors may have a circular inner configuration and a hexagonal outer configuration coaxial to the axis of the column mounting hole.
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