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specialist
29th Jul 2008, 10:14 PM
Not sure if this is the best place for this, if not please move. Thank you.

Thought you might be interested. This is what I have been doing at work for the last couple of days. This is a tipper that we repaired and built a new bin for about 9 months ago. It had been rolled and was destroyed.

Low and behold they did it again just a month ago and we have it again:C. We started it yesterday so I will make it wa wip, the repairing of it.

The first photo is from the back showing the twist in the chassis, the chain that you can see is to tie it down.

The second photo is from the front, again just to show the twist.

The third photo is of the final pull with the crane to pull the twist out of the chassis.

The fourth photo shows the front of the trailer almost straight.

There is probably still a days work in finishing the chassis, getting the bows and pulling it square again. I will post some more photos of that in the next couple of days.

Robert.

Yonnee
30th Jul 2008, 12:22 AM
Mmmm... big toys!!

Nice work so far. :2tsup: Keep us posted.

specialist
31st Jul 2008, 11:29 PM
Just an update on the straightening of the tipper chassis.

First photo: After the twist is taken out of the main chassis rails, it leaves them with other bends, in this case the chassis had about a 50mm bow from front to back. This is the hydralic ram that we are using to push the sides. We had to do this same process about 12 times in different places to get it straight:doh:

The next 4 photos just show the extent that we need to go to so that the chassis doesn't move while we are working on it. The only problem is that all those chains and stays need to be removed after every push so that we can see the progress.:C

Photo number 5 shows the chassis straight, ready to be moved into the workshop for the final fixes: the bent top strap to be cut out and replaced, hinge pin cut out and replaced, air lines and electrical to be reconnected, the hoist trunnions to be repaired and the fixings for them in the skidplate.

The last photo is just an overview of the entire operation.

Tomorrow, we will start on the tipper bin and we will be trying to straighten the middle segment of the hoist that was bent when it went down.

I'll try to post some pics to that operation on the weekend

Thanks for looking

Robert

wheelinround
1st Aug 2008, 10:24 AM
Robert great WIP

An oversized panel beaters shop for bigger toys

I guess your straining posts are deep concreted??

the rams do they get welded to the chassis via tack plates??

The crane top notch do you hire that in???

I imagine a crane playing like a yo yo I know from experience to much and it can be stuffed having one to far. A bit of heat here cold, heat bucket of water.


:rolleyes: Thank goodness Dr's dont use such methods on our backs :oo:

specialist
1st Aug 2008, 08:30 PM
Hi Wheelin, Yonnee'

Just to answer your questions.

The program changed for today, so I had to finish a fuel trailer for the customer to pickup on monday, axles, mudgaurds, paint today, and wireing tomorrow. It seems that Monday is the big day for the tipper bin's surgery.:o

They are big toys, but it's not the norm, these jobs seem come up every so often just to break the monotony.:U


The frame that we use straighten the trailers is like a series of steel u sections that are concreted in the ground and then beams are welded up the sides for pushing points. the bottom part of the u section is exposed so that we can weld hold down points were we want them depending on the condition of the job.

Mostly the stays that we use to hold the trailers are tacked into place but the ram is just placed and used, every so often it will slip out, but is very rare. We are aware of the danger and always keep clear of it.:;

The company owns the crane, it's a chinese 35 ton capacity, very handy:2tsup:. It is much easier now with the advent of computerized weighing systems, something that our old crane which was 40 years old didn't have:C. You start by pulling say 5 tons of pressure and go up in incraments of 1/2 ton until you have the desired effect. This particular trailer took 6.5 tons to pull straight.


:rolleyes: Thank goodness Dr's dont use such methods on our backs :oo:
I don't know, I've been to a bone cracker that seemed to use such methods.
:C

If the trailers are bent up or down then we use the hot spot method and cool with water to pull to the desired position. We didn't have to do that with this one though.


Robert

wheelinround
2nd Aug 2008, 10:02 AM
thanks Robert not much has changed bus and coach chassis much the same

I've been around when a pull-chain has decided the strain got to much good job everybody was having morning tea