Bejing China A tower crane being climbed, apparently down, collapsed killing three workers and injuring two including the operator. The Operator was asked some questions in the hospital and seems to be indicating in this blog that the hydraulic pump may have had an issue.
It seems that few climbers are fast and smooth. Often I've been on climbers that caused the jibs to bounce. Overtime the bounce becomes a rhythm which is hard on the jibs and pendants. Sometimes the technician needs stop and let the bounce settle then get going again in hopes that he can get the fluid flowing smoothly. The only other thing that strikes me as likely to be within the hoist mechanism is in the ram. If a person were to not have a positive acting check valve, a failure of the pump to create pressure or a hose bursting could quickly drop the entire superstructure which can certainly be a serious problem as it endangers the integrity of the crane itself.
There is more information in this article as well, but the translation is terrible and so I cannot make heads or tails of it.
塔式起重机倒塌北京
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