We need a crane thread ....... so here it is

[V8Druid]

I’m in the French Alps on holiday and there are quite a few of these around on new-build sites. I had a close(ish) look at one today and can only deduce that it is held up by magic alone, as the footprint is tiny (12 feet square) and cribbage looks like zero shits are given. I paced the outreach at over 30m(!) - it’s ridiculous!
Haven’t seen one working so not sure what sort of weight they hang off them but the fact it doesn’t just tip over anyway is very impressive - it has around 16 tonnes of concrete counterweight but the minuscule footprint makes no sense at all when viewed ‘in the flesh’.View attachment 55643View attachment 55642View attachment 55622View attachment 55621View attachment 55620View attachment 55619

that's a LOT of ballast Dan

 

[Rob65]

I’m in the French Alps on holiday and there are quite a few of these around on new-build sites. I had a close(ish) look at one today and can only deduce that it is held up by magic alone, as the footprint is tiny (12 feet square) and cribbage looks like zero shits are given. I paced the outreach at over 30m(!) - it’s ridiculous!
Haven’t seen one working so not sure what sort of weight they hang off them but the fact it doesn’t just tip over anyway is very impressive - it has around 16 tonnes of concrete counterweight but the minuscule footprint makes no sense at all when viewed ‘in the flesh’.

If the base is 12 ft that’s about 4m. The mast is in the centre so call that 2m x 16tonnes is 32te.m resisting over turning (this called the restoring moment) if it’s got 30m of reach divide 30m in to 32te.m and you get about 1tonne capacity at full reach.

That does not make any allowance for a safety factor though. I’m sure Druid will put me right on this but I think it’s 75% on tipping capacity so that give a safe working load of about 750kg so I would think that’s workable on a residential build.

 

[V8Druid]

If the base is 12 ft that’s about 4m. The mast is in the centre so call that 2m x 16tonnes is 32te.m resisting over turning (this called the restoring moment) if it’s got 30m of reach divide 30m in to 32te.m and you get about 1tonne capacity at full reach.

That does not make any allowance for a safety factor though. I’m sure Druid will put me right on this but I think it’s 75% on tipping capacity so that give a safe working load of about 750kg so I would think that’s workable on a residential build.

 

[Monkeybusiness]

I still think it must be magic, whatever the laws of physics stipulate!

 

[JerryRtilt]

I've always thought they must be better than having a Telehandler shunting about on a tight site ?

 

[Monkeybusiness]

Had another shufty at it on the way past to the lifts today - I reckon the counterweight is only centred approx 1m from the centre of the slewring (it’s well within the outriggers) so I guess @rob65’s calcs need halving (and the weight/radius of the boom and lifting equipment needs to be taken into account also).
Still looks wrong in every single way, without lifting anything!

 

[DaveDCB]

Doesn’t look a very busy site , so I’d say everything is broken down into very lightweight lifts..

 

[Monkeybusiness]

Doesn’t look a very busy site , so I’d say everything is broken down into very lightweight lifts..

They’ve done bugger all this week since I’ve been here the lazy bastardos! You’d think it was the holidays or something?!

 

[DaveDCB]

They’ve done bugger all this week since I’ve been here the lazy bastardos! You’d think it was the holidays or something?!

You mean to tell me you’re not away on an all expenses paid ‘work’ trip?!

 

[Monkeybusiness]

You mean to tell me you’re not away on an all expenses paid ‘work’ trip?!

Sshhhhhhhh!…

 

[6feetdown]

https://m.facebook.com/photo.php/?photo_id=799205202218299

 

[V8Druid]

https://m.facebook.com/photo.php/?photo_id=799205202218299

linky-no-worky

 

[TiltyShaun]

I looked into those cranes quite heavily in 2007 and was almost tempted to buy one. From memory the capacity was around 1ton at full reach as said by others. Got a client site coming up which would be ideal for one but it still would take a leap of faith to invest.

 

[V8Druid]

I looked into those cranes quite heavily in 2007 and was almost tempted to buy one. From memory the capacity was around 1ton at full reach as said by others. Got a client site coming up which would be ideal for one but it still would take a leap of faith to invest.

don't think they're MASSIVE cost to rent in on contract Shaun

 

[pettsy]

https://www.falconcranes.co.uk/images/specs/selfe/igo21.pdf

 

[Monkeybusiness]

https://www.falconcranes.co.uk/images/specs/selfe/igo21.pdf

And this is the bigger one - those specs are nuts when you look at one in real life!

https://www.manitowoc.com/media/13012/download

 

[Rob65]

Had another shufty at it on the way past to the lifts today - I reckon the counterweight is only centred approx 1m from the centre of the slewring (it’s well within the outriggers) so I guess @rob65’s calcs need halving (and the weight/radius of the boom and lifting equipment needs to be taken into account also).
Still looks wrong in every single way, without lifting anything!

It’s about where the centre of mass of the ballast weight is, so if it’s all in the. centre that’s fine.

I didn’t make any allowance for wind load or the self weight of the crane though so the actual capacity will be a bit lower than I said but the basis of my ‘back of envelope calc’ won’t be far out.

 

[6feetdown]

linky-no-worky

photo shopped possibly

 

[Vinpetrol]

View attachment 55748photo shopped possibly

That looks like it could wipe out a continent , never mind lift a big lintel in

 

[V8Druid]

View attachment 55748photo shopped possibly

yep