Oops....
Discussion in 'Heavy Haul Trucking Forum' started by Cat sdp, Oct 25, 2017.
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You all missed the biggest thing. No the front set does not need to follow the truck. As a matter of fact you steer opposite the turn. Crabbing in certain situations is what you need to do. If you watch closely you can see the only steering being done was the rear set of axles.
If he had been crabbing with both axles he might have been ok but no guarantees.
Here is what he did wrong
1. He was moving too fast for steering response on the dolly.
2. When you corner like t hat you drop the front neck of the dolly to reduce the lateral force from the turn.
I have run that exact setup several times. We always drop the neck when making turns like that. You will see that the neck on the dolly is dropped because when you turn it swings out from under the beam.
Here is a video my pilot took one day. It is a 3 axle but the process is the same. The three axle does not have a neck like the 6 axle dollies do.
longbedGTs, Bean Jr., truckdad and 10 others Thank this. -
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The main principle behind pre-stressed concrete is concrete is very strong in compression, very weak in tension. The tensioned cables are there to always keep the concrete in compression.
Beams like this are also engineered by the shape of the beam and the cables, to be very strong on one position (usually force applied straight down from the top) but can't take much load from the side or twisting. This beam could probably hold 100s of 1,000s of pounds from the top but can't even support it's own weight from the side. -
Just out of curiosity, was that a self steering trailer or a remote control steer?
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