Posted by Jim.ME on December 15, 2023 at 13:28:22 from (67.242.176.154):
In Reply to: Stationary crane posted by flying belgian on December 15, 2023 at 10:44:48:
Amazing machines. Erection and disassembly require attention to detail and respect of details. Erection of tower cranes is not a one method fits all project. The crane and the tower determine how they are erected as well as location. There are some small models that are truck and or trailer mounted and truly self-erect, basically unfolding themselves from the travel/stowed position.
Most of the larger ones use a truck or crawler crane to assemble the tower to a given height and install the upperworks (jib machinery deck, etc. at the top of the tower), which may be assembling it to working height if it doesn't need climb/jack and high enough to clear obstructions to swinging. If it is going to climb it may be assembled at a level high enough to allow installing the tower jacking components. During climbing the ends of the upper works must be kept in balance to prevent tipping of the tower. Some can at least partially assemble and disassemble the jib and machinery deck themselves.
It is interesting to stand at the base of one when working and look up the tower. You can watch the tower bend in the direction the upperworks is loaded. They are generally left to freewheel (rotate) when not working due to wind loadings on them, also there are windspeed ratings that require taking them out of service and allowed to free wheel. Which is one of the reasons if there are two or more tower cranes on a site, in close proximity, they will be assembled to different heights so one can swing over the other.
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