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Needle boom rotary tower crane - is constructed in different cross-sectional sizes for increasing height demand
Needle boom rotary tower crane - is constructed in different cross-sectional sizes for increasing height demand
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机译:针臂旋转塔式起重机-具有不同横截面尺寸的结构,以增加高度需求
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摘要
The rotary tower crane has a tower constructed from uniformly sized sections which can be arranged to provide a tower of small or large cross section, as required. The tower sections can be aligned in a single, vertical column to provide a tower having a narrow cross section, or a number of sections can be joined horizontally to form sections of enlarged cross section, which are then vertically aligned to provide a tower having an enlarged cross section. Four rectangular framework sections are attached at their adjacent vertical edges to form a section of enlarged cross section, having a rectangular central opening for receiving the tower head of the crane, which opening is approximately equal in size to the cross section of the original smaller sections.
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