How can the hanging tower on the construction site be raised layer by layer without dismantling the suspenders?

Prepare a pencil, disconnect it at 1cm, and make a paper sleeve with the same thickness as the pencil. The paper sleeve is 3cm long, and one end has a semicircular opening with the length of 1cm as the upper end. Put the broken pencil into the paper sleeve from the opening, and then move the paper sleeve upward to complete the process of lifting the pencil. This is the jacking principle of tower crane.

The segmented pencil is called standard section, the paper sleeve is called framing, and the process is called jacking operation.

The above is the fixed attachment type, in addition to the internal climbing type, and so on.

The driving force of jacking is to install a pumping station on the jacket, which is a hydraulic system and can be understood as a jack. The jack actually used is complicated and has a perfect power and oil cut-off protection system.

The jacking operation of tower crane seems simple, but it is a very dangerous special operation. Accidents in jacking operation of tower cranes are common at home and abroad.

I have been engaged in disassembly and assembly of large construction machinery for many years. Welcome to ask questions about construction machinery and discuss them together.