For large building construction projects, tower cranes are used quite frequently. These equipments are rather necessary for heavy lifting as well as positioning supplies and equipment. Tower cranes offer a unique configuration that provides a lot of benefits over more traditional cranes. These advantages include: higher vertical lift, quiet electrical operation, reduced space requirements and increased capacities.
A hammerhead crane is a different configuration that is most often associated with a tower crane. In this situation, a long horizontal jib is connected to a vertical tower. One end of the jib extends horizontally over the worksite and the other end of the jib acts as a counterweight. On the hammerhead crane, there is a trolley. This trolley has the lifting cable and travels along the length of the jib. The tower crane is capable of operating anywhere in the jib's radius.
Self-Erecting Tower Cranes
Self-erecting cranes are normally assembled on site with the assistance of a different crane. This provides a huge benefit in setup time and greatly saves time in equipment expenses as well. Self-erecting cranes are usually remote-controlled from the ground, even though there are several models which have an operator cab built onto the jib.
The self-erecting crane is normally freestanding to allow them the opportunity to be moved around. There are some models that have a telescoping tower that enables the crane to work at multiple heights without the need to reconfigure the tower.
Luffing Jib Tower Crane
Most urban work settings do not have enough space or clearance for the jib to freely rotate without existing buildings blocking its movement. A luffing jib tower crane is ideal for such tight spaces. Most tower cranes have a fixed horizontal jib. The driver is able to raise or lower a luffing jib in order to allow the crane to swing in a reduced radius.