Any city's skyline will almost always include a few tower cranes, which are among the most prominent pieces of construction equipment. Tower cranes are used by construction businesses to lift large items like steel and concrete. Tower cranes are also used to transport large items such as acetylene torches, motors, and generators. Construction tower cranes are the centre of attention on job sites all around the world. Most large construction sites rely on them as the backbone and workhorse. If they aren't working, the workplace isn't operating at maximum efficiency. That is why tower crane installation is being given so much relevance. If you want to get crane installation in Abu Dhabi, this guide might help you.
What is a tower crane?
On construction sites, a construction tower crane is a popular piece of lifting equipment. The crane is nicknamed a tower crane because it pivots around a massive tower-like structure. The jib and counter jib is supported by the tower mast, strengthening the cabling, trolley, and hook that lifts the load.
Need for tower crane installation in a building
Today's tower cranes enable construction businesses to work more quickly and efficiently. These heavy-lifting essentials are required for completing even the most demanding chores with ease. Consider a big construction site where there isn't a single tower crane in sight. Even with all of the workers on a job site, an electrical generator could not be lifted up many flights of stairs. Without tower cranes, the construction sector would be decades behind. We would lose not only the spectacular buildings of modern cities but also their bridges, elevated railways, and other amenities. Construction sites would use a lot more energy than they do now.
The working of tower cranes
A tower crane is a common sight on building sites all around the world. Their seemingly endless skyscrapers rise hundreds of feet above the ground to dot the skylines of nearly every major metropolis. When a project necessitates heavy lifting at great heights, these massive machines come in handy, but they can be costly to purchase. As a result, it's typical for contractors to search for tower cranes for rent.
Types of tower cranes
There are as many different types of tower cranes as there are lifting requirements. The most prevalent tower crane types used on building sites are listed below.
- A hammerhead crane has a horizontal jib that is fixed in place and a trolley assembly that travels the length of the jib to position the hook. Some hammerhead tower cranes have pendant lines between the jib/counter jib and a tower top assembly, while others have a "flat-top" design that does not have a tower top or pendant lines.
- A jib that rotates up and down with the hook connected to the jib end is used in this sort of crane—luffing the jib up or down positions the hook. This crane is very handy on confined construction sites. When not in use, a Luffing jib crane's jib is placed at a higher boom angle, reducing the radius required for weathering to less than half of the maximum practicable reach.
- A self-erecting crane is a smaller tower crane installed on the job site without the need for an assist crane. This type of crane will typically extend its mast before unfolding its jib using hydraulic cylinders permanently attached to the crane. These cranes cannot be connected to the structure and have limited hook heights, but they are ideal for smaller or shorter-term projects where the fixed expenses of constructing a standard "tower" would be prohibitive
What is the location of a tower crane in a building?
We may refer to a location outside or inside the construction project floor plan, depending on crane positioning on the job site.
- If the crane is positioned outside the construction plan floor- In terms of construction progress, it is preferable to locate a tower crane outside the constructed structure's floor plan. Such a crane does not obstruct construction progress, and the date of its removal can be postponed if necessary with no detrimental impact on the development process. It also allows for crane installation ahead of the start of foundation work. Crane positioning outside the floor plan of the constructed structure allows for easy crane material delivery, and an excellent view of the transport means from the crane operator's cabin during material collection, which speeds up crane operation and enhances safety. Existing subterranean infrastructure services in front of the structure and their protection zones (high-pressure gas pipelines, sewage collector, etc.), the outermost underground section of the structure, or construction pit for basement complex structure may pose issues in this sort of crane arrangement. The tower crane must then be moved away from the structure to a distance that poses no threat to subsurface infrastructure services or the integrity of the construction pit wall. Special foundations, such as micro pilots, may be intended to stop load on the construction pit wall.
- If the crane is positioned inside the construction plan floor- If the crane must be placed within the floor plan of a built structure, it is usually put on the structure's underlying structure, which is appropriately adjusted. A portion of the base structure, where the crane will be moored, can be built ahead of time, reducing construction time. The crane's horizontal reach is reduced due to its positioning within the structure. As a result, its beam may be shorter than a crane situated outside the structure's floor plan. The placement of cranes within the structure, on the other hand, makes progress more difficult. In most circumstances, assembly holes for the crane tower must be left in ceiling structures. Static measurements are taken to determine the location of assembly holes. The size of the assembly hole must also allow for safe crane disassembly. Assembly holes can be avoided by installing cranes in elevator shafts, which must be large enough to accommodate the crane tower and its assembly and disassembly and the shaft walls' formwork. As a result, elevator shafts are rarely suitable for crane positioning. Within the floor plan of a built structure, a tower crane may be installed directly on the ground and relocated to allow for continued building after a specific structure portion is completed. This construction approach is ideal for projects with multiple pieces, such as low-rise structures. Crane relocation is only possible once all heavy sections of the construction structure have been installed, which may cause delays in the construction process. There could also be a concern if there is any subsurface water. The installation of the abovementioned crane obstructs the completion of the base structure and creates a watertight basin. Due to crowded site conditions and development progress, a situation may arise where a tower crane must be mounted atop a completed ceiling structure. This technique is utilised, for example, to speed up construction by installing support cranes, with the possibility of later relocating the tower crane. A structural designer evaluates the ceiling structure and, if necessary, reinforces or supports it using struts. The crane load is transferred onto numerous ceiling slabs under each other, potentially into the base structure, by pillars.
Tower cranes have made it possible to transport the steel and concrete required for skyscraper building safely and efficiently, resulting in iconic skylines. It's feasible to drive about and see cranes with a fresh perspective for their outstanding engineering if you have a thorough grasp of construction cranes.