Oooops

[bowten]

The crane was manoeuvring in order to reverse towards the lock site.There are no coping stones at that point so the banking would not be able to support anything like that weight.

[steven wilkinson]

 

woah - when did you name your boat?

 

Thats what I spotted! A small area that was in a temporary state of repair!

[John Holden]

The crane was manoeuvring in order to reverse towards the lock site.There are no coping stones at that point so the banking would not be able to support anything like that weight.

 

Yes, the contents of one of the early links seems to have changed and in it they state that the crane was manoeuvring to work on the locks.

[Skye]

Just a thought, surely who ever instigated the work insisted on a risk assessment and a method statement for all aspects of the contract, or did they? If it was CRT then they need to take a serious look at their policies in relation to works. If the crane was employed by a farm or other private entity then CRT need to look at its access policy.

[bowten]

 

woah - when did you name your boat?

 

Thats what I spotted! A small area that was in a temporary state of repair!

About a week ago,all my other boats have been named Pathfinders or Iron Dukes.Such is my illness my wife and Doc thought I would not be able to finish this one,therefore Tenacious seemed a good choice.

[Skye]

About a week ago,all my other boats have been named Pathfinders or Iron Dukes.Such is my illness my wife and Doc thought I would not be able to finish this one,therefore Tenacious seemed a good choice.

 

Excellent well done, and I hope you name your next "bloody minded"

[bowten]

Excellent well done, and I hope you name your next "bloody minded"

Not quite sure what you mean by that.

[Skye]

Not quite sure what you mean by that.

 

From your post (I must learn how to quote more than one)"Such is my illness my wife and Doc thought I would not be able to finish this one"

 

So be bloody minded and show them you can finish another one

[bowten]

From your post (I must learn how to quote more than one)"Such is my illness my wife and Doc thought I would not be able to finish this one"

 

So be bloody minded and show them you can finish another one

Ah sorry,I was being a little touchy.

[Skye]

Ah sorry,I was being a little touchy.

 

Ee tha all re'at wi can all bi a bit like that at ti'ams

[Ian Mac]

I would like to ask someone a very basic question. Why did they need such a big heavy crane in the first place, The biggest thing they can be lifting are the lower lock gates max weight 20tons, and the distance can't be that big, it doesn't make any sense, also you pay more for a bigger crane. The other thing is not actually much of the bank has collapsed, so just how close was he to the bank and why

--

cheers Ian Mac

[John Holden]

I would like to ask someone a very basic question. Why did they need such a big heavy crane in the first place, The biggest thing they can be lifting are the lower lock gates max weight 20tons, and the distance can't be that big, it doesn't make any sense, also you pay more for a bigger crane. The other thing is not actually much of the bank has collapsed, so just how close was he to the bank and why

--

cheers Ian Mac

 

From the chewed up ground in the video it appears that he was turning on to the tow path. A turning vehicle imparts a much greater sideways thrust than one going in a straight line.

[Graham Davis]

I would like to ask someone a very basic question. Why did they need such a big heavy crane in the first place, The biggest thing they can be lifting are the lower lock gates max weight 20tons, and the distance can't be that big, it doesn't make any sense,

--

cheers Ian Mac

 

All to do with "moments" in the physical/mathematical term.

It might weigh 20 ton if lifted directly upward, but as the distance between the object and the lift point increases so the weight increases.

Formula and explanation here:

http://en.wikipedia.org/wiki/List_of_moments_of_inertia

[Peter Reed]

I would like to ask someone a very basic question. Why did they need such a big heavy crane in the first place, The biggest thing they can be lifting are the lower lock gates max weight 20tons, and the distance can't be that big, it doesn't make any sense, also you pay more for a bigger crane. The other thing is not actually much of the bank has collapsed, so just how close was he to the bank and why

--

cheers Ian Mac

Maybe his tom tom sent him down there.

[steven wilkinson]

it could well be that the crane could only be sited some distance from the object to be lifted! Thats why some cranes are massive, but only lift a small amount!

[Skye]

All to do with "moments" in the physical/mathematical term.

It might weigh 20 ton if lifted directly upward, but as the distance between the object and the lift point increases so the weight increases.

Formula and explanation here:

http://en.wikipedia.org/wiki/List_of_moments_of_inertia

 

I_x = I_y = \{m r^2}{2}\,\! = Splash!

[leeco]

I have just been up to have a look and asked one of the workers and he said it was for the lock gates. Who ever did the risk assessment and gave to go ahead to take a crane on there need there head checking. They brought it over a farmers feild with metel track ramps.

[furnessvale]

I have just been up to have a look and asked one of the workers and he said it was for the lock gates. Who ever did the risk assessment and gave to go ahead to take a crane on there need there head checking. They brought it over a farmers feild with metel track ramps.

 

Ah yes! So much safer than using a boat and sheerlegs in the bad old days!

 

George ex nb Alton retired

[Hair Bear Bunch]

All to do with "moments" in the physical/mathematical term.

It might weigh 20 ton if lifted directly upward, but as the distance between the object and the lift point increases so the weight increases.

Formula and explanation here:

http://en.wikipedia.org/wiki/List_of_moments_of_inertia

Apparently the spec for this machine appears to be 90 tons at 2.5m but only 1.2 tons at 48m so if I've read the spec sheet right 20 tons is max at 10m.

If you're interested in a bit of engineering porn... http://www.cranesuk.net/images/stories/pdf%20downloads/ATF_90G-4.pdf

[Ian Mac]

Apparently the spec for this machine appears to be 90 tons at 2.5m but only 1.2 tons at 48m so if I've read the spec sheet right 20 tons is max at 10m.

If you're interested in a bit of engineering porn... http://www.cranesuk.net/images/stories/pdf%20downloads/ATF_90G-4.pdf

So 2.5 is as close as it can get the load, so another metre to the lock edge, then 3.5m to hold the far gate in position. 7m max so the crane is far too big for the job, no wonder they had problems.

--

cheers Ian Mac

[nonemoreblack]

I took some photos when we went up today to have a look - it's clearly come up the temporary track, then intended to reverse back towards the top of Dobson Locks. Link to the photos is here:

https://picasaweb.google.com/112194494424188318286/CraneInCanal

Not sure about uploading in the actual message.

 

So 2.5 is as close as it can get the load, so another metre to the lock edge, then 3.5m to hold the far gate in position. 7m max so the crane is far too big for the job, no wonder they had problems.

--

cheers Ian Mac

 

Dobson Locks is a double staircase lock though to it would probably need that extra reach to get to the bottom set of gates in the bottom lock from by the top lock.

Edited February 3, 2013 by nonemoreblack

[steven wilkinson]

So 2.5 is as close as it can get the load, so another metre to the lock edge, then 3.5m to hold the far gate in position. 7m max so the crane is far too big for the job, no wonder they had problems.

--

cheers Ian Mac

 

you are assuming the crane can get as close as possible to the lift. The furthest gates could well be that extra 3m reach away.

[frangar]

Remember you need space to put the outriggers down which will move the crane further away from the lift. The reach length will be from the centre of the pivot point on the crane.... Not the edge of the truck.

 

Cheers

 

Gareth

[Ian Mac]

So 2.5 is as close as it can get the load, so another metre to the lock edge, then 3.5m to hold the far gate in position. 7m max so the crane is far too big for the job, no wonder they had problems.

 

Lets do in feet 1m = 3ft the canal is 14ft wide, therefore the centre of the far gate is 11ft from the edge 3ft to the outrigger and then the crane & outrigger is 16ft wide so another 8ft added up 22ft = 7m

--

cheers Ian Mac

Edited February 4, 2013 by Ian Mac

[frangar]

2.5m is probably the minimum allowing for the boom etc... This wont allow for the outriggers which possibly stick out more... 2.5m is fine if you are lifting down a hole which will fit between the outriggers. I'm not sure you quite get all the things that need to be taken into account when sizing a crane.

 

Cheers

 

Gareth