Tower crane is one of best machinery you would ever choose it will make you to be set for a life with a secure job that wont make you look for another. At our company were have other machines that you can choose from such as excavator, Forklift, Mobile crane, Bulldozer and Front loader truck.
Tower crane: Benefits
Using tower cranes makes even the most challenging tasks manageable for construction project managers. The tasks typically assigned to them include:
- Moving heavy equipment.
- Concreting a portion of the construction.
- Carrying building supplies.
- Lifting and putting steel beams.
Such things are vitally necessary for building sites and the construction sector to have in place.
With tower cranes, construction of tall buildings using more eco-friendly ways is possible even in the densest urban areas. In addition, they can complete building projects more quickly, effectively, and cheaply. The most appealing advantage of hiring a tower crane is the money saved on labour.
Tower crane: Types
The various forms of tower cranes can be categorised as follows:
Hammerhead crane
The jib of a hammerhead crane extends horizontally and is connected to a tower set upright. In the office, the jib stretches horizontally and is balanced by weights at one end. Transporting equipment is facilitated by a trolley holding the lift rope that slides along the jib. The cabin where the operator sits is where the jib and tower meet. A second tower crane is usually needed for setting up and breaking down this crane model.
Self-erecting cranes
There is no need for a second crane to help install a self-erecting or self-assembling crane on site. This benefit is crucial in minimising the time to launch and the project’s overall cost. Even though the jib of some versions of this crane can be converted into an operator’s cabin, most self-erecting cranes are operated from the ground via radio or television. The towers of this sort are often self-sufficient and mobile, allowing them to be relocated as needed.
Luffing jib cranes
Urban areas are typically too crowded to allow for jib rotation. Most tower cranes have a horizontal jib that cannot be moved, but a luffing jib can be raised or lowered to decrease the crane’s turning radius. When lifting passengers closer to the tower, a luffing jib can be used instead of an electric wagon because it can be raised and lowered as needed. Because of its high cost and intricacy, luffing cranes are only utilised in exceptional circumstances.
What is Tower crane?
A tower crane is essential for constructing skyscrapers, other large buildings, and intricate endeavours. This apparatus is designed to guide and direct heavy machinery at elevated work sites. Creating a tower crane for optimal performance and safety is no easy task. Often, a foundation is used to secure the crane within the building site.
The apparatus consists of a vertical metal rig that holds up a horizontal lever, arm, canvas, or jib. The horizontal lever can be turned through a complete circle. Cranes have steadily increased in size and strength throughout construction history to aid construction workers in their quest for increased productivity, speed, and safety. Cranes can be either stationary or mobile, depending on the requirements of the job at hand.
Safety Precautions of Cranes Operation
(1) Concentration, mutual cooperation, and specially assigned person command. Lifting operations should have professional command. Power supply and hydraulic systems, etc. should be operated by specially assigned person.
(2) Workers at high place shall strictly comply with the high place safe operating procedure.
(3) Inspect the steel wire ropes, retaining rings, connecting bolts, pins, etc., and replace the damaged or fatigue cracked parts in time. Regularly check the lubricating condition of ring gear, rotation parts, wire rope, etc.
(4) Making sure that the cable insulation is good, the position switch action is sensitive and reliable.
(5) When several cranes are working on the same site, the height difference between the adjacent tower cranes should not be less than the height of the instructions required.
(6) Check the positioning pin, adjust the guide wheel clearance. Do not rotate the tower head during mast section raising procedure. Mast section raising operation at night is prohibited.
(7) After the mast section raising, check whether the power is cut off. Left and right joystick shall be returned to the middle position. Anchorage frame guide wheel and tower body shall be disengagement. Bolts on each section shall be tightened firmly.
(8) There should be good grounding facilities for the tower crane. Only related workers is permitted to stay at the installation area. When wind force level above 3, tower crane operation is not allowed.
(9) Anchorage device should be checked regularly to prevent slipping & loosing to cause accident.
(10) Cabin shall be equipped with firefighting provision.
1. Why we use cranes
Tower cranes are normally used for lifting heavy building materials, machinery equipment, and other objects at construction site. They are usually located beside/on buildings with exact positioning to handle heavy loads. It has a long working range, big load capacity, flexible height and working range, etc. With these advantages, using a tower crane can reduce labor intensity, increase efficiency and shorten construction time.
2. Self erection tower crane can be classified by outline into topkit, topless, luffing jib tower crane, their advantages and disadvantages are as followings:
(1) Topkit cranes
Advantages
initial type of tower crane, mature technology, low cost.
Disadvantages
with tower head, installation height will be higher than other types’; jib shall be lifted and fixed as a whole, so assembly and disassembly require higher load capacity of lifting equipment which follows high cost. Require a bigger height difference when tower cranes work closely.
(2) Topless cranes
Advantages
Jib can be fixed as per section separately so that the requirement to the lifting equipment may be lower than topkit type’s. The jib can be dismantled easily so that it’s suitable for site that require a flexible working jib. Without tower head, that lows the tower crane height and is suitable for many tower cranes work together. Jib construction has a long life time and high security. Installation cost is lower than that of topkit type.
Disadvantages
Producing cost is higher than topkit type’s.
(3) Luffing jib cranes
Advantages: Suitable for working at narrow space and many tower cranes work together. Normally max load is higher than other types’. And luffing jib tower crane is also applicable for some place that jib over working area not allowed.
Disadvantages: The price is higher than other two types of tower crane. The cost of assembling and disassembling are high too. Because the luffing jib don´t have trolley mechanism, the working process are slow.
Each type of tower crane can be classified into stationary, travelling and internal climbing type used for differenct working conditions.
3. Necessary data for selecting a cranes
(1) Height under hook(HUH);
(2) Working range(Jib length);
(3) Max. load;
(4) Tip load;
(6) Mechanism type(Normal/Frequency control);
(7) Tower crane type
