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LEASTBAY
LSU Fan
Member since Aug 2007
6439 posts

re: OB Engineers: Steel Beams to Make a Bridge
What about metal storage units on each side and then a shorter bridge inbetween.


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Capt ST
Army Fan
Middle of the Mall
Member since Aug 2011
9030 posts

re: OB Engineers: Steel Beams to Make a Bridge
I’d drive some sheet piles to stabilize the bridge. We’ve had same problems at a couple places I hunted. The one in Port Gibson we dropped in some large OD pipe and spanned across it. It took one major rain, and a little debris in front of culverts and it washed out around them overnight. That sandy soil is terrible.


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Hankg
Member since Feb 2011
496 posts

re: OB Engineers: Steel Beams to Make a Bridge
Down I-10 before Highland exit is a place that makes long concrete beams for bridges I’m guessing. I always wondered what they did with the off spec ones. Maybe they would sell you a couple? I met the owner a couple times, don’t remember his name, seemed like a reasonable guy.


eng08
LSU Fan
Member since Jan 2013
4122 posts

re: OB Engineers: Steel Beams to Make a Bridge
Bad choice there. Offspec concrete spans will be terrible.

Rail car bridge is likely cheapest metal span one can find.

I priced a bailey bridge, pioneer, and another brand for work at like a 80ft span and it was a pain. They did not like going over the 50-60ft range. The bridge alone was over $100k for cheapest option, that didn’t count the ringer barge crane that set it.

If you can put a few pile groupings in the creek and shorten the spans to like 25 ft you can build entirely out of wood or use your steel beams and put a deck on it. That’s more work than the rail cars.

You will need one hell of a foundation for the railcar, maybe even pile supported foundation to make it last.


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257WBY
Baylor Fan
Member since Feb 2014
2139 posts

re: OB Engineers: Steel Beams to Make a Bridge
Keep an old ATV on the far side. Set up a cable with a basket so you can get in and cross.


bayou choupique
LSU Fan
the banks of bayou choupique
Member since Oct 2014
1294 posts

re: OB Engineers: Steel Beams to Make a Bridge
no way a 12" beam will span that distance. i know highway work is designed for a lot more weight but a span that long your talking at least several 36" steel beams for that span. I know the rail car seems expensive but it probably your cheapest and best option.

if you want an erector set look up Acrow bridge ( acrow). This is what they used on the interstate after Kartina but i think they were are typically +/- 60' spans. They have some used ones for sale here ( eifel trading) sometimes. or they do have used trestles for sale per pound but again the span in not going to be more than 60' at max.


jralspanky
Fargo
Member since Apr 2009
926 posts

re: OB Engineers: Steel Beams to Make a Bridge
quote:

Two basic questions:

1) will this idea work?

2) how do I make the calculations for how large of a beam I need? Is there a simple formula for this?


1. Nope
2. You don't
3. Buy a prefab bridge and have it installed


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Boudreaux35
BR
Member since Sep 2007
17384 posts

re: OB Engineers: Steel Beams to Make a Bridge
Technically, you could span 75' with W12 "beams" but not just 2. You would need more, spaced closer together. I don't think you're gonna be able to compete with the flat car idea unless you have a connection to get several more "beams" at a very cheap price.

If you could install a support in the middle, it would help a lot, but that would require driving a couple piles, which will take the price back up.

quote:

2) how do I make the calculations for how large of a beam I need? Is there a simple formula for this?


Not really, but if you happen to know a structural engineer, or may even a 3rd or 4th year student, you could probably get the calcs done for maybe some beer money. You're gonna need to somehow tie those deck timbers down also.


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Ruxins Rascals
LSU Fan
Middle of Da Bayou
Member since Nov 2018
323 posts

re: OB Engineers: Steel Beams to Make a Bridge
Got to my steel manual, with 2 stringers you would need W36x853 (853lb/ft) or 3 stringers, W36x529 (529 lb/ft).


To surmise, this bridge is gonna need some serious design consideration if you want to go with anything other than the rail car bridge.


tigerfoot
LA-Monroe Fan
Alexandria
Member since Sep 2006
42246 posts

re: OB Engineers: Steel Beams to Make a Bridge
75 feet is a long damn way! Good luck, but I just don’t see a homemade bridge being way to go. 12 foot is a long way to fall


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footballdude
LSU Fan
BR
Member since Sep 2010
327 posts

re: OB Engineers: Steel Beams to Make a Bridge
quote:

I had a guy come out and quote me an 89 foot railcar bridge, installed, for $26,000.


Call that guy - he seems to know what he is doing....
...no way you are going to beat that price


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deltaland
Mississippi St. Fan
Member since Mar 2011
53832 posts

re: OB Engineers: Steel Beams to Make a Bridge
Rent a small trackhoe and drive some pilings down and then build a wooden bridge



TunaTime
LSU Fan
LA
Member since Aug 2012
681 posts

re: OB Engineers: Steel Beams to Make a Bridge
quote:

Got to my steel manual, with 2 stringers you would need W36x853 (853lb/ft) or 3 stringers, W36x529 (529 lb/ft).


Yikes.


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10
dstone12
East Carolina Fan
Member since Jan 2007
10796 posts

re: OB Engineers: Steel Beams to Make a Bridge
Would you consider grading your higher land to close the gap to 50 feet? Boulder it so it doesn’t wash away?


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Boudreaux35
BR
Member since Sep 2007
17384 posts

re: OB Engineers: Steel Beams to Make a Bridge
quote:

drive some pilings down and then build a wooden bridge


You will be very limited in span length due to the length of timber stringers readily available. You would probably be looking at 4 spans.


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Mark Makers
LSU Fan
Livingston Parish
Member since Jul 2015
1871 posts

re: OB Engineers: Steel Beams to Make a Bridge
quote:

Down I-10 before Highland exit is a place that makes long concrete beams for bridges I’m guessing. I always wondered what they did with the off spec ones. Maybe they would sell you a couple? I met the owner a couple times, don’t remember his name, seemed like a reasonable guy.


Boykin Brothers


Putty
LSU Fan
Member since Oct 2003
23885 posts

re: OB Engineers: Steel Beams to Make a Bridge
quote:

I am thinking about buying four of the 50 footers. And joining two of them together with some sort of fabricated jointing plate?


Not an engineer, but this does not seem like a solid plan.


AlxTgr
LSU Fan
Kyre Banorg
Member since Oct 2003
66254 posts

re: OB Engineers: Steel Beams to Make a Bridge
Any of y'all know where I can find stuff like this for a simple walkway over a ditch?


civiltiger07
LSU Fan
Baton Rouge
Member since Dec 2011
9694 posts

re: OB Engineers: Steel Beams to Make a Bridge
check a local fabrication shop, especially if they do industrial work.


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White Bear
USA Fan
NWLA
Member since Jul 2014
5189 posts

re: OB Engineers: Steel Beams to Make a Bridge
quote:

access timber on their land. I used to be in that business
Well just push some holler logs off in it and go'head.


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