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RobK
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How Are Cranes Erected?

Sat Jan 14, 2006 7:40 am

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!?

So, who knows?

R
 
SlamClick
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RE: How Are Cranes Erected?

Sat Jan 14, 2006 7:49 am

Hey, that is a pretty good question!

They must have some "bootstrap" procedure.

All I know is that we had a distinction here a few years ago. The "world's tallest" free-standing crane fell over in Sparks Nevada.
Happiness is not seeing another trite Ste. Maarten photo all week long.
 
bristolflyer
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RE: How Are Cranes Erected?

Sat Jan 14, 2006 7:50 am

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.

BF
Fortune favours the brave
 
RichardPrice
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RE: How Are Cranes Erected?

Sat Jan 14, 2006 7:53 am

Mobile cranes also wont have the lifting capacity that the cranes they construct have, thats why they arent used.

The tower crane goes up bit by bit, including the ballast, so its not a heavy lift for a mobile crane. But the stuff the tower crane moves can be much much heavier.
 
jake056
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RE: How Are Cranes Erected?

Sat Jan 14, 2006 7:53 am

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.
 
tmatt95
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RE: How Are Cranes Erected?

Sat Jan 14, 2006 7:57 am

Hi,
Here is a link to a good article that I have found on tower cranes. It includes a section on how they are assembled and how they can grow with the building:

http://science.howstuffworks.com/tower-crane.htm

Matt
 
greasespot
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RE: How Are Cranes Erected?

Sat Jan 14, 2006 9:08 am

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...

Christine....
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?"
 
bill142
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RE: How Are Cranes Erected?

Sat Jan 14, 2006 9:19 am

The tower can be adjusted as required but another crane is equired. It usually takes about 24 hours to dismantle a cran using a 226 tone crane.

http://www.skyplaza.com.au/gallery.htm

Talks about the dismantling process albeit only very breif.

 
jafa39
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RE: How Are Cranes Erected?

Sat Jan 14, 2006 10:40 am

Quoting RobK (Thread starter):
How Are Cranes Erected?

Google "Fluffers" for the real explanation.  Smile
We, the undersigned, do hereby consent.....
 
navymidn
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RE: How Are Cranes Erected?

Sat Jan 14, 2006 2:59 pm

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.

[Edited 2006-01-14 07:19:46]
Law is a major base of civilized society
 
A346Dude
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RE: How Are Cranes Erected?

Sat Jan 14, 2006 6:03 pm

Quoting RobK (Thread starter):
How Are Cranes Erected?

Well, you see, when two cranes love each other very much...
You know the gear is up and locked when it takes full throttle to taxi to the terminal.
 
IAH777
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RE: How Are Cranes Erected?

Sat Jan 14, 2006 10:40 pm

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)
 
QANTASforever
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RE: How Are Cranes Erected?

Sat Jan 14, 2006 10:50 pm

Quoting RobK (Thread starter):
I've always wondered how they erect them.



Quoting Jake056 (Reply 4):
My understanding is that they "jack" themselves up.





...am I missing something?

QFF
Fighting for the glory of the Australian Republic.
 
jafa39
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RE: How Are Cranes Erected?

Sun Jan 15, 2006 5:59 am

Quoting QANTASforever (Reply 12):
...am I missing something?

Yup!  Wink
We, the undersigned, do hereby consent.....
 
fraspotter
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RE: How Are Cranes Erected?

Sun Jan 15, 2006 9:54 am

Quoting A346Dude (Reply 10):
Well, you see, when two cranes love each other very much...

 rotfl  rotfl  rotfl  rotfl  rotfl  rotfl  rotfl 
"Drunk drivers run stop signs. Stoners wait for them to turn green."
 
Thom@s
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RE: How Are Cranes Erected?

Sun Jan 15, 2006 10:59 pm

Quoting RobK (Thread starter):
How Are Cranes Erected?

Soundtrack: "Love is in the air"




+



=



Thom@s
"If guns don't kill people, people kill people - does that mean toasters don't toast toast, toast toast toast?"
 
andz
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RE: How Are Cranes Erected?

Sun Jan 15, 2006 11:16 pm

Quoting SlamClick (Reply 1):
The "world's tallest" free-standing crane fell over in Sparks Nevada.

Was that Big Blue?
After Monday and Tuesday even the calendar says WTF...
 
Thom@s
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RE: How Are Cranes Erected?

Sun Jan 15, 2006 11:40 pm

This is supposed to be the largest crane of it's kind in the world:

http://www.towercrane.com/index.gif

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.

http://www.stord.kommune.no/eining/resser/industri/eldner01stor.jpg
Here it is. Nicknamed "Ivan". Compare it with the yellow crane on the left, and you'll see the difference.

Now, enough crane talk.  Smile

Thom@s
"If guns don't kill people, people kill people - does that mean toasters don't toast toast, toast toast toast?"

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