The utility model further provides a telescopic boom crane.

本实用新型还提供一种伸缩臂起重机。

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Telescopic boom crane in the performance of a substantial high from the performance or the impact of conditions is essential.

伸缩臂的性能对起重机在大幅度高起升工况下的性能的影响至关重要。

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Boom crane often has a boom with varying cross section. Boom weight, its construction and main dimension significantly affects the crane performance.

臂架式起重机常采用变截面的臂架，臂架的自重、结构型式与主要尺寸对起重机的性能有重要的影响。

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The cause of the crane failure for which the long boom of the crane folded back over the cab and now hangs in the air is also unclear.

WSJ: Broken Crane Looms Over Neighborhood

In other incidents, cranes have dropped loads or come close to falling apart, including a dramatic episode in which a crane's arm, or boom, nearly snapped off during Superstorm Sandy and dangled precariously over a midtown Manhattan block.

WSJ: APNewsBreak: Operator cited in NYC crane collapse