Loading timber onto a trailer, how to tie it down?

[toolman77]

How do you secure tongue-and-groove boards that are both uneven in shape and a bit fragile in the tongue and groove?

 

[Testarn]

How do you strap tongue and groove boards that are both uneven in shape and a bit fragile in tongue and groove.

Make some protective edge guards from boards, for example 22x95, screwed together at a right angle and 30-40 cm long that you place under the strap. If you have 4-6 of these, you can save them to use in the future.
If you have some leftover plywood, that can work too but the screw holds less well in it (unless it's many layers and high quality).

 

[toolman77]

Have done so but still feel that the boards get too little friction against each other. Those in the middle of the stack easily become very loose after bouncing around for a while. One variant that has worked okay is to place a regel over the stack and tighten it down to the trailer, but it's not super good.

 

[Mikasw]

How is it really the case here, if you have 1000kg load, I have thought that a 1t strap would be enough...
But according to a teacher I had this week, you have to calculate it, if you travel at 90, the load weighs 9t during braking (which might be true), so then it is 9t you need to secure

He probably had a bit of bad luck when he thought that.
The force depends on the deceleration and the kinetic energy on speed.
Normally, you can be at 0.7-0.8g.
Rounding up to 1g, the force becomes F=1000kg*9.81m/s2=9810N.
Then you need to subtract the friction force between the load and the surface to determine the "real" forward force that the load securing must withstand.

It seems that the requirements have been lowered,
https://www.transportstyrelsen.se/s...k/Gods-och-buss/Matt-och-vikt/Att-lasta-ratt/

 

[Cheesen]

How is this really, if you have 1000kg load, I thought a 1t strap would suffice...
But according to a teacher I had this week, you have to calculate it, if you drive 90, the load weighs 9t when braking (which might be true) so then you should secure 9t

No, the load still weighs 1000 kg at 90. The mass does not change. Something that driving schools don't understand, it's basic physics.

The regulations state double the weight forward. So for 1000 kg, you must secure for 2000. But when you pull with a two-ton strap, you rarely exceed 1.6 tons due to friction coefficient. That's why you need two two-ton straps to properly secure 1000 kg. Noticed that many have answered your question. The information in "lasta rätt" provides a good rule of thumb.

Securing your wood package so that it stays put during a sudden stop at 90 km/h is impossible, by the way, the wood won't hold for it. If you calculate as the driving schools suggest, that weight would be around 300 tons....

 

[Mikasw]

Twice the load's weight was also what I was taught, but the Swedish Transport Agency, see link above, now states 0.8 times the load's weight. I assume this is governed by the EU.

To know which tension straps are needed, you have to calculate the friction coefficient and clamping force between the load and the load-bearing structure.

 

[nino]

It's possible I was half-asleep so I didn't quite hear it
Now, this was during a counterbalance truck course, but that shouldn't matter... and you hardly reach 90 with one of those

I'll ask at the next training opportunity