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Posted on 10/20/20 at 2:51 pm to No Colors
So, the only thing holding it up is the 2 sides of the bank...?
Posted on 10/20/20 at 2:52 pm to No Colors
Should have started with this photo. Hard no for me. I'd say get an old railcart or go with a culvert and backfill. Probably some farmer/logger that will let you borrow a culvert to set and remove for a fair price.
Posted on 10/20/20 at 2:56 pm to No Colors
We were going to do the samething this year, but with timber prices in the tank it's just not worth it.
Posted on 10/20/20 at 2:59 pm to No Colors
Quick calculation...not to be taken as advise or legally responsible for any damages!
If the beams are 12" deep and 8" wide, we'll assume they are W12x40's. Being from the 1940's, we'll assume they are made from A36 steel. A single W12x40 (36 ksi) with a 30ft span can handle a maximum moment of 103 k-ft.
The link below shows the maximum TOTAL moment (not per wheel or anything like that) for a HL-93 load (which will be your log truck) is 397 k-ft. So in an absolutely perfect world where the load is distributed evenly among all 4 beams you would barely be okay...but that's not going to happen and there's no telling what has happened to the beams in 80 years.
Load Table - See 30 Ft
If the beams are 12" deep and 8" wide, we'll assume they are W12x40's. Being from the 1940's, we'll assume they are made from A36 steel. A single W12x40 (36 ksi) with a 30ft span can handle a maximum moment of 103 k-ft.
The link below shows the maximum TOTAL moment (not per wheel or anything like that) for a HL-93 load (which will be your log truck) is 397 k-ft. So in an absolutely perfect world where the load is distributed evenly among all 4 beams you would barely be okay...but that's not going to happen and there's no telling what has happened to the beams in 80 years.
Load Table - See 30 Ft
Posted on 10/20/20 at 3:03 pm to Woodbird
Ie- you better video this shite
Posted on 10/20/20 at 3:05 pm to jimbeam
The 2 interior beams are spliced in the middle third of the span.
Posted on 10/20/20 at 3:17 pm to No Colors
I would definitely put 2x12s long ways also where the tires will pass. That way you are not point loading individual crossboards with an axle at a time.
I'm no engineer though.
I'm no engineer though.
Posted on 10/20/20 at 3:29 pm to No Colors
For the price of salvaging one loaded truck out of the creek you can probably install a low-water crossing and cut those banks back
Posted on 10/20/20 at 3:40 pm to tenfoe
Funny you mention that, I am actually designing a LWC at the very moment.
This post was edited on 10/20/20 at 3:47 pm
Posted on 10/20/20 at 3:57 pm to Woodbird
quote:
Quick calculation...not to be taken as advise or legally responsible for any damages!
If the beams are 12" deep and 8" wide, we'll assume they are W12x40's. Being from the 1940's, we'll assume they are made from A36 steel. A single W12x40 (36 ksi) with a 30ft span can handle a maximum moment of 103 k-ft.
The link below shows the maximum TOTAL moment (not per wheel or anything like that) for a HL-93 load (which will be your log truck) is 397 k-ft. So in an absolutely perfect world where the load is distributed evenly among all 4 beams you would barely be okay...but that's not going to happen and there's no telling what has happened to the beams in 80 years.
I agree with this. Pretty similar to what I scratched out.
Posted on 10/20/20 at 3:59 pm to No Colors
Posted on 10/20/20 at 4:02 pm to Lonnie Utah
Posted on 10/20/20 at 4:05 pm to kengel2
And that is exactly why I’m not a bridge inginear
Posted on 10/20/20 at 4:08 pm to No Colors
Has anyone jumped up and down on it a few times? That would be my starting point.
Posted on 10/20/20 at 4:17 pm to Woodbird
quote:Probably brought in from China at a steep discount.
.but that's not going to happen and there's no telling what has happened to the beams in 80 years.
Posted on 10/20/20 at 4:36 pm to auggie
Agree, need a support pier in the middle
Posted on 10/20/20 at 4:52 pm to Sparty3131
I'm enjoying the implementation of the rule of thumb here. You hair splitting engineers wouldn't get shite done in the field or woods. 
Posted on 10/20/20 at 5:09 pm to No Colors
If at any point the creek bed is dry or almost dry I would but in footings and piling every 6 foot for a permanent reinforcement. You could also build a series (8) of 12”X12x12 framing a for concrete footings then buy 8 screw jacks and 8 4x4s to support the structure. It’s a temporary and non permanent fix and easy work around instead of a culvert and permit. I’d place them all in the center with 4 splitting the couplings. Should increase the load bearing capability by 20,000lbs easy.
Posted on 10/20/20 at 5:14 pm to kengel2
Ol' baw was dodging the scales on the "big road".
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