Self-erecting tower cranes run the risk of tipping much like mobile cranes.
In some cases, self-erecting tower cranes are replacing mobile cranes because of their efficiency in travel and set-up. Self-erector set-up is similar to mobile crane set-up. Both require firm, level ground with extended outriggers or stabilizers. Counterweights must be installed per the manufacturer’s specification like most modern mobile cranes.
Unlike traditional tower cranes, which experience structural failure if overloaded, self-erectors are more likely to tip over. However, like mobile cranes, self-erectors are difficult to turn over because of their large structural design factors and required load chart safety margins.
Our Tower Crane Operator & Inspector covers hammerhead, luffing, and self-erecting tower cranes.
See also Flat Top Luffing Tower Crane.
This Flat Top Luffing Tower Crane can go from horizontal with a 55 meter radius to a minimum radius of three meters in only 90 seconds. The luffing speed is varied by the load sensing hydraulic luffing cylinder.
This near vertical feature is particularly beneficial on crowded job sites. With the jib in this vertical position, the out-of-service radius is less than 10 meters.
It has 12 tonnes lift capacity when dual reeved at 55 meters, and 6 tonnes capacity at 55 meters when single reeved.
Read more about Wolffkran’s 166B on Vertikal.net.
See also, Tower Crane Collision.