How not to Use

R

R_Schra

Location
Netherlands
Hi,

Here another dutch posting.....(fellow dutch may know these pics already)

This happend at a work i did some years back.

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It happend because the top of the tree was heavier above the hook and tipped away from the crane. It pulled the complete crane upside down.... (50 tons)
 
No im not bored today... I had to work out some planting schemes for tomorrow and to catalog and photoshop some tree pictures. And also nice to keep up the information gartering through the internet.

rgrds Ronald
 
[ QUOTE ]
Close call. Do you remember how much it weighed and what the capacity was at that radius?

[/ QUOTE ]

The limb weighed 3500Kg WET out the canal. So i quess it should been about 3000kg. Before i made the cut i quessed it 3500kg with a load capacity of 4500Kg from the crane.

The crane operator was injured though. He had an serious headinjury some years before. (some skull was replaced by "plastic") With this rumble/thumble in the cab he got again a light concussion. After this accident he never got back on a crane after 40 years doing so... The same crane after beeing repared i used to remove these beech trees that where infected with fungus.

See at my pages. (go over the pic with mouse to see the second)

The red/white pole is 2meters. (a red and white part is 50cm)
 
Schra,

I'm don't mean to sound attacking in this at all but:

I'm suprized the crane company would work with you again.

Clearly the placement of the slings was by the climber and was chosen to be too low. Crane operators aren't the ones that have extensive knowledge of tree rigging and it's often the climber that needs to do things right.

The pull of that top flipping must have been massive!

If I was the owner of that crane, I think I would have killed someone if the accident didn't kill anyone.

Glad no one was really killed and I'm sure that mistake won't be made ever again.

I thank you for sharing the story and the pictures with us. It was scary just visualising it.
 
[ QUOTE ]
Schra,

I'm don't mean to sound attacking in this at all but:

I'm suprized the crane company would work with you again.

Clearly the placement of the slings was by the climber and was chosen to be too low. Crane operators aren't the ones that have extensive knowledge of tree rigging and it's often the climber that needs to do things right.

The pull of that top flipping must have been massive!

If I was the owner of that crane, I think I would have killed someone if the accident didn't kill anyone.

Glad no one was really killed and I'm sure that mistake won't be made ever again.

I thank you for sharing the story and the pictures with us. It was scary just visualising it.

[/ QUOTE ]

Hi,

The cranefirm is quit big and we get almost all our crane/skylift equipment from them (hired). As far i know we get along fine and in good order. not the less that accident.....I think the "crane owning company's" least concern was the crane, they first asked after the operator and ground crew.... My own boss just kicked me and my crew of the accident site to fill the day with mowing ditches /forum/images/graemlins/mad.gif

A other point is that the crane operator is fully responsible for the lift. If he doesnt like the job he has to refuse it, if he doesnt feel save at the load/the placement of the sling/location of the cut, he just have to say and i change it. The sling was attached at that point with communication up and down the tree. Also before the cut was made we talked it over if all was ok. Never the less it went wrong with that accident as result. Also there was a colleque at the floor that had at the time more experience in crane work. he also confirmed that the rigging would be ok.

There where some circumstances on the site that day, that maybe had a big influence on the job and insight from the crane operator, ground crew and me as climber. But those are "after the accident i know[quess] what happend" things... When something like that is in order again i'll just stop the rigging and take a brake(for an hour, day, week, month if neccesary). Untill now this worked very well and no accidents or near misses accured again.

By the way, it took 3 days to get the crane out. they had to remove the boom and lifted the crane carriage and boom with a 200 and a 180 tons crane out.

Regards, Ronald
 
[ QUOTE ]
There where some circumstances on the site that day, that maybe had a big influence on the job and insight from the crane operator, ground crew and me as climber. But those are "after the accident i know[quess] what happend" things...

[/ QUOTE ]

What were the circumstances that you realized after the accident? Hearing them could prevent another accident.

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Untill now this worked very well and no accidents or near misses accured again.

[/ QUOTE ]

By "...this..." I assume you mean attaching the sling so that the piece is tip heavy i.e. when the piece is cut it will fall and invert just like when you butt tie a piece with a rope.

Is this your regular technique for cutting pieces for a crane? What other cutting methods do you use?

Thanks.

Mahk
 
[ QUOTE ]
[ QUOTE ]
There where some circumstances on the site that day, that maybe had a big influence on the job and insight from the crane operator, ground crew and me as climber. But those are "after the accident i know[quess] what happend" things...

[/ QUOTE ]

What were the circumstances that you realized after the accident? Hearing them could prevent another accident.



[/ QUOTE ]

a little summary of that particular job;

After 4 weeks holliday for the construction site people we had to start and finish the job in 3 days..... to much pressure to get it started with a clean head. It was known to do this job for several months!! So a late start wasnt neccesary at all.

one of our groundcrew, the "experienced" guy, had an attitude of "no whining, cut that tree" if you asked for a feedback on your work..... This time unfortunatly i listened to him.... /forum/images/graemlins/mad.gif

In my opinion was the crane not the right way to do this. I prevered just to climbe them, cut of the limbs and fell the trunk with help of a timberjack. we could have, without problem and costs, used a boat to put a mobile crane on to remove the limbs from the water. the boat was there for the construction work.

The poplars were not allowed to fall because of supposed damage to the grasfield/lawn and park. yeah, we had to get on it with a big 50tons crane, tractors with snippertrailors, our vermeer BC2000 chipper, mobile (wheel)crane to feed the chipper and the timberjack to get the truncks out. so with all that I assumed the fall of the tree should do the less damage. (at the end the whole waterside had to be reshaped....so why the hell beeing so cautious /forum/images/graemlins/confused.gif)

one other thing was that the crane operator was not really sharp anymore after his previous severe head injury. From people that had worked with him previously, after his accident and before the our tipover happend, told me that they only worked with him with a person near the operator for extra eyes and watching over the lifting. The builders he had worked with didnt "trust" him fully anymore... To bad that after an accident they told it, it opend their eyes to what could have happend at one of the building sites....

[ QUOTE ]

[ QUOTE ]
Untill now this worked very well and no accidents or near misses accured again.

[/ QUOTE ]

By "...this..." I assume you mean attaching the sling so that the piece is tip heavy i.e. when the piece is cut it will fall and invert just like when you butt tie a piece with a rope.

Is this your regular technique for cutting pieces for a crane? What other cutting methods do you use?

Thanks.

Mahk

[/ QUOTE ]

I suppose you misread me or you are funny /forum/images/graemlins/laughing.gif

Of course i dont attach tip heavy any more.....

I do balance the limbs horizontaly sometimes with two spreaded slings......

Regards Ronald
 

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