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re: Engineers of the OB: Will this bridge support a loaded log truck?
Posted on 10/22/20 at 5:18 pm to auggie
Posted on 10/22/20 at 5:18 pm to auggie
quote:
A rail car would handle the weight fine.
We used rail cars for exactly this type of thing for years. It would work fine. I believe he said it was a 30' crossing. Most rail cars are 60-90 feet long.
1
Posted on 10/22/20 at 5:23 pm to TimeOutdoors
quote:
Most rail cars are 60-90 feet long.
Now that I think about it, they are longer than that, they carry at least a couple of the loaded intermodal type trailers on each level. Really a perfect solution.
Posted on 10/22/20 at 5:58 pm to No Colors
That hombre in the first photo looks like he's looking for the lawnmower.
I think if that bridge fails it be at one of the ends with the bank giving way around the beams.
I think if that bridge fails it be at one of the ends with the bank giving way around the beams.
Posted on 10/22/20 at 6:15 pm to No Colors
I ran this through a highly complex simulation with our latest software package and it looks like you'll get at least one truck across.
Posted on 10/22/20 at 6:16 pm to Engineer
Posted on 10/30/20 at 6:43 am to No Colors
Did the bridge collapse?
Posted on 10/30/20 at 7:38 am to ultralite
A few concerns.
The OP said they dug out the ends and filled with concrete (approach slabs basically), but at issue is the soil density under that concrete which likely would have been compacted stone. Also, with 30’ spans and steel I beams, I’d suspect mid span supports (piles) with bent caps would be needed.
All in all, with an 80k load, that’s sketchy as shite. Getting a licensed SE to just do a cursory evaluation would’ve been money well spent. Someone could die or at the least, it’s be a messy situation that would be an act of Congress to cleanup.
The OP said they dug out the ends and filled with concrete (approach slabs basically), but at issue is the soil density under that concrete which likely would have been compacted stone. Also, with 30’ spans and steel I beams, I’d suspect mid span supports (piles) with bent caps would be needed.
All in all, with an 80k load, that’s sketchy as shite. Getting a licensed SE to just do a cursory evaluation would’ve been money well spent. Someone could die or at the least, it’s be a messy situation that would be an act of Congress to cleanup.
This post was edited on 10/30/20 at 7:40 am
Posted on 10/30/20 at 8:15 am to ultralite
quote:
Did the bridge collapse?
I downt rememver wat happenz bwat it's herd to tyype from tis hozprotal bed wit all theze casts on
Posted on 10/30/20 at 8:27 am to No Colors
quote:Talk-to-text or get one of those things Steven Hawking had.
I downt rememver wat happenz bwat it's herd to tyype from tis hozprotal bed wit all theze casts on
Posted on 10/30/20 at 8:56 am to No Colors
culvert and backfill. 80000 is a heaping pile!
Posted on 10/31/20 at 7:40 am to No Colors
I'm no engineer, but I'll throw this out there. From my own experience when dealing with heavy weight, things tend to go downhill because they start torquing on one end or collapsing on one side. Once this starts you can't recover. So even though your concrete approach slab can handle the downward pressure, I don't see anything to save you if the ground on one side starts giving way faster than the other side. Driving pilings on either side of the slab to stop side to side movement and then anchoring into them for extra support would make me feel a lot better if I were you.
Posted on 10/31/20 at 9:13 am to Tangineck
quote:
From my own experience when dealing with heavy weight, things tend to go downhill because they start torquing on one end or collapsing on one side. Once this starts you can't recover
Well said. If you're doing enough to cause intrinsic failure of a steel beam, the end approaches are probably already thrashed.
Posted on 10/31/20 at 9:24 am to No Colors
I may have missed it but what is the reason for not doing cross bracing and putting piles underneath? Worried about high water washing out the pilings?
Posted on 10/31/20 at 9:49 am to GREENHEAD22
quote:
Worried about high water washing out the pilings?
Pilings won't be permanent due to the force of water coming down that creek.
But if we move forward with the timber harvest, I'm definitely gonna weld plates across the I beams to keep them from twisting. Then put some 12x12 pilings under those plates as temporary supports. Hopefully won't get a big rain during the Logging event.
Then I'll just cut them out with a chainsaw once the last truck has exited the property. And just use it as a pickup and tractor bridge from there on out. Let me kids worry about it if they want to cut some timber back there in 30 years.
Posted on 10/31/20 at 10:06 am to No Colors
Yea temporary pilings are a must imo.
This post was edited on 10/31/20 at 9:07 pm
Posted on 10/31/20 at 9:01 pm to No Colors
At that point, just drop culverts in
Posted on 10/31/20 at 11:28 pm to White Bear
quote:
Those old riveted splices in the beams worry me.
bingo!
Posted on 11/1/20 at 12:57 am to No Colors
Posted on 12/16/20 at 10:09 am to No Colors
We need an update on this!! been thinking about this damn bridge and if it worked all huntin season....
Posted on 12/16/20 at 10:21 am to JDPndahizzy
quote:
We need an update on this!!
Good call, followed this thread when it was started, found it interesting. Would love an update.
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