RobK From United Kingdom, joined Sep 2004, 3946 posts, RR: 18 Posted (8 years 7 months 1 week 5 days ago) and read 21550 times:
I've always wondered how they erect them. I could perhaps understand a piece by piece construction of the metal framework, both vertical and horizontol, but how the hell do they get the concrete ballast up there? Surely they'd have to use ANOTHER crane to get it up there, which kinda begs the question why they don't use THAT crane in the first place!?
BristolFlyer From United Kingdom, joined May 2004, 2290 posts, RR: 0
Reply 2, posted (8 years 7 months 1 week 5 days ago) and read 21535 times:
Tower cranes assemble themselves and/or they are assembled with a mobile crane - depending on the size. Mobile cranes are very expensive to operate (due to the fact they are expensive to buy) so it is inefficient to have a mobile onsite for a long time.
Jake056 From United States of America, joined Mar 2004, 291 posts, RR: 0
Reply 4, posted (8 years 7 months 1 week 5 days ago) and read 21523 times:
My understanding is that they "jack" themselves up. As one section on the ground is installed, jack it up and install the next under that until get the desired height. Sort of like growing from the ground up.
Greasespot From Canada, joined Apr 2004, 3079 posts, RR: 20
Reply 6, posted (8 years 7 months 1 week 4 days 23 hours ago) and read 21462 times:
Holy crap..I was driving home and there is a new high rise and i was wondering the same thing......They just seemed to appear already assembled and in one piece.....I thought it was one of the mysteries of the universe us mortals were not ment to know...
Sometimes all you can do is look them in the eye and ask " how much did your mom drink when she was pregnant with you?"
Navymidn From United States of America, joined Sep 2003, 188 posts, RR: 1
Reply 9, posted (8 years 7 months 1 week 4 days 17 hours ago) and read 21403 times:
Generally a tower crane is used when space is an issue. That is why they are so popular over in European cities. They can have a larger lift radius due to the design then a traditional mobile crane, which has to have it's boom at an angle. As far as capacity goes, mobile cranes can have much larger lifting ability than a tower crane. A large tower crane can hoist about 70-80 tons, whereas a large crawler can lift 300-350 tons. This is by no means an upper limit, the largest tower crane lifts 120 tons, and the largest mobile 1600 tons.
Erecting a tower crane is either done by using a self lifting design, or calling in a mobile crane to assemble it. The self-erecting design is popular for smaller tower cranes, because it can cost about $600 an hour for a 150 ton capacity truck crane.
IAH777 From United States of America, joined Mar 2008, 0 posts, RR: 5
Reply 11, posted (8 years 7 months 1 week 4 days 9 hours ago) and read 21343 times:
They're shown pornographic images of other naughty cranes.
Seriously, there was a show on TLC or the Discovery Channel last week about mega-cranes. There's one company who makes a 150 ft truck-mounted crane that....um.....erects itself. The narrarator actually said the phrase, "Its so easy that one man can erect it by himself." (or something like that)
Thom@s From Norway, joined Oct 2000, 11953 posts, RR: 46
Reply 17, posted (8 years 7 months 1 week 3 days 8 hours ago) and read 21233 times:
This is supposed to be the largest crane of it's kind in the world:
A few have been built, but the only operational one is on the offshore shipyard at my hometown Stord, Norway. It is approx 150m tall, and appeared on the Discovery channel a few years ago.
Like the drawing, the crane on Stord has a smaller crane on top to deal with maintenance. Unlike the drawing, this crane also has a construction at the bottom which elevates it further, and makes it possible to move the massive machine on a set of lines on the ground.
Here it is. Nicknamed "Ivan". Compare it with the yellow crane on the left, and you'll see the difference.
Now, enough crane talk.
"If guns don't kill people, people kill people - does that mean toasters don't toast toast, toast toast toast?"