Parts of Tower Crane
Before going any further, it helps us know in advance about the parts of a tower crane.
A tower crane at least consists of 3 parts:
1. Foundations
This section serves to continue the load of the tower crane to the ground hard and as a barrier that tower crane did not fall. In this section foot tower crane bolted to concrete foundations are massive and large.
2. Mast / standard section
This section is a vertical section of a tower crane that can continue to grow along with the needs of the project. In this section there is a vertical staircase that divided per section that will be used by the operator to climb to the top.
3. Unit spinning
This section consists of 3 parts:a. Horizontal jibHorizontal jib is a horizontal section of a tower crane long and serves as part of lifting weights. Also referred to as a hoisting jib or jib working.b. Machinery jibIn this section there are the motor of the tower crane, electronic equipment and a massive concrete that serves as a counter balance. Therefore, it is sometimes called a counter balance jib.c. Operator's cabThe place where the operator works. The cab must have large windows to make sure the operator has a full view of the construction site. Given the high location, this cab should also be equipped with air conditioning and other equipment.
Tower Crane Load capacity
A typical tower crane has the following specifications:
The maximum stand-alone high - 265 feet (80 meters)Tower cranes can have more than 80 meters high only if the tower crane held / hung on the building so that it can grow along with the increasing height of the building project
Maximum range - 230 feet (70 meters)
The maximum lifting capacity - 18 metric tons, 300 tonne-meters
Counterweight - 20 tonThe maximum lifting capacity is 18 ton tower crane tower crane but should not be lifting weights for it at the far end of his jib. The closer the position of the load is lifted with the mast tower crane, the greater the load that can be lifted safely. Hence the imposition of tower cranes follow the principle of 300 tonne-meters. That is, if the load is as far as 30 meters away from the pole, then the permissible load of 10 tons. If the load is as far as 50 meters, then the permissible load of 6 tons.Tower crane is equipped with two buttons limit to ensure the operator does not lift the excessive burden:
The maximum load monitor key pull on the cable and make sure the load does not exceed 18 tonnes
Key moment to make sure the load carrier does not exceed the principle of tone-meter when the load is moved on the jib.
Crane Tower foundation
The first element that ensures the stability of the tower crane is a large concrete foundations that have been cast in advance. The foundation usually has a size of 10 x 10 x 1.3 meters (but depends also the type of tower crane to be used). There is also a type of tower crane is able to save the concrete foundation by having four smaller foundation that will support the load of each foot tower crane. Big bolts embedded in this foundation.
Establishing Tower Crane
The first phase, with the help of a mobile crane jib horizontal section and machinery spliced and placed on two concrete foundations. Then add a mobile crane counterweight. While the vertical tower crane mounted with the help of mobile cranes as well.The second phase, to reach the maximum height, tower crane grows itself. Here is used a top climber or climbing frame.Here's the process:1. Tower crane lifting a load on the jib to balance the counterweight.2. Technicians remove the spinning unit and with a hydraulic machine on top climber will push the spinning unit rose as high as 20 feet (6 meters).3. Operator using a crane to lift a vertical section of tower cranes and fill a void that is in the top climber. When finally installed and bolted, then the tower crane has been a high increase of the section.
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