How do they put cranes up? surely they need another crane to put up a crane? my head hurts:help:

the cranes build themselves using hydrolics, a ram pushes the cab up and a new section of the body is slid underneath then the process is repeated until the desired height is achieved

nice one, didnt think id seen any driving around

the cranes build themselves using hydrolics, a ram pushes the cab up and a new section of the body is slid underneath then the process is repeated until the desired height is achieved

What utter rubbish. They use lots of helium balloons to lift each section up and small squirrel monkeys assemble them then parachute back down.
Don't you know anything.

I thought they planted a crane seed and then watered it :(

It does usually take a mobile crane and a truck load of ballast which can be moved onto the base of the static crane bit by bit to erect it though- on small building sites there are small ground-operated self-erecting cranes, but even these need ballast in order to safely lift weights at a reach away from the main body of the crane.

I thought they planted a crane seed and then watered it :(

thats what i thought

I'm glad some one asked this. I was wondering myself.

I assume the ballast is there to counter act the load on the jib.

But what effect does the ballast i.e. the concrete blocks on the back of the cab, have when there is no load?

Does it want to tip over backwards? Principle of moments etc.

When there's no load on the jib, the cab is moved close to the pivot point and therefore exerts little force to tilt the crane over in any direction.

The major ballast is on the base of the crane anyway- the blocks near the cab are very small in comparison.

I was thinking this myself the other day! I was getting myself into a right flap trying to work out how they put a crane up :(

It is best you gels dont worry your pretty little heads about such things.
Leave things like this to us menfolk.
Concentrate on what to give the man of the house for his tea, and you will not be so worried about things. :hihi: :hihi: :help:

It is best you gels dont worry your pretty little heads about such things.
Leave things like this to us menfolk.
Concentrate on what to give the man of the house for his tea, and you will not be so worried about things. :hihi: :hihi: :help:

Funniest post of the day :hihi:

Funniest post of the day :hihi:


Hmm. If you say so.

When there's no load on the jib, the cab is moved close to the pivot point

You've lost me there Medusa :confused:

Everything you wanted to know about tower cranes:

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

Beware if you're at work. Just been looking at the above site and it spoke to me. Why do sites do this? Do they not realise that loads of people are doing a sneaky surf whilst in the office.


G

PS - I'm at home so was OK.

Didn't think of looking there. Doh!:D

Thanks for the link.

Yesterday I was travelling down Broad Lane and got diverted as Tenter Street was closed. One of the tower cranes on the building site next to Sytner’s was being dismantled.

To dismantle the crane, an even bigger (but mobile) crane was used.


G

How do they put cranes up? surely they need another crane to put up a crane? my head hurts:help:


I'VE ALWAYS THOUGHT THAT 2!!