Procedure for Bottom Climbing Tower Cranes
Climbing tower cranes are critical to the construction of high-rise buildings. The cranes build themselves, by inserting shaft sections into the frame, making it higher. Each section added to the crane takes it up another floor. The crane can climb the shaft, working in any position along its length.
Other People Are Reading
-
Tower
-
Tower sections are put one on top of another on the crane's base. On top of that is positioned the machine deck and the "slew-ring" mount, notes the LCR Group on its crane demonstration web page. On top of all of that goes the "power pack," which holds the crane's engine, hydraulics and rope drum assembly.
Boom
-
The crane's gantry is attached to the crane, and the boom sections are placed into position. The crane's hoist rope is then pulled onto the tower. Finally, according to the website, the crane's climbing frame -- a sleeve that goes around the top of the crane shaft -- is mounted to the tower.
-
Monorail
-
On either side of the climbing frame are hydraulic climbing rams and attached to the top is a monorail that will carry the new sections into the tower. Below the monorail, the climbing frame is opened wide enough that a new section of tower can be pulled through.
Climbing
-
When it's time to increase the size of the crane, a new tower section is hoisted up the tower with the hoist rope and is suspended from the monorail. The climbing frame lifts up hydraulically making room for the new section. Then, the new section is pulled through on the monorail, extending the height of the tower.
-
Resources
- Photo Credit kran image by shime from Fotolia.com
