Lightweight tower crane boom for conveying pumped concrete
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United States of America Patent
Stats
-
Dec 15, 1987
Grant Date -
N/A
app pub date -
Jul 22, 1986
filing date -
Jul 22, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A lightweight boom supported by a rotatable jib of a tower crane for introducing flowable concrete mix to form systems has a concrete conveying conduit which functions also as a structural member of the boom, in order that the overall weight of the latter is minimized. The elongated boom has a triangular configuration in transverse cross-section, with two parallel, co-planar, spaced upper members and a hollow, concrete conveying bottom member that is generally parallel to the two upper members and spaced below the same. Horizontally extending brace members interconnect the two upper members, and spacer bars depending from the two upper members are secured to the bottom member. One aspect of the invention concerns a wheeled cart that is pivotally connected to an end portion of the boom and rests on ground level structure for supporting a portion of the weight of the boom while the jib lifts an opposite end portion of the boom to an elevated position, so that the weight and consequently the length of the boom can be increased without exceeding the carrying capacity of the tower crane. The boom is particularly adapted for tower cranes that are used to fabricate large annular concrete structures such as hyperbolic cooling towers.
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