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civiltiger07
LSU Fan
Baton Rouge
Member since Dec 2011
9721 posts

re: OB Engineers: Steel Beams to Make a Bridge
The article says they had to cut down the span to 66ft.


Marlo Stanfield
Houston Astros Fan
Member since Aug 2008
1258 posts

re: OB Engineers: Steel Beams to Make a Bridge
I’ll tell you right now, you are insane if you think you are going to spam that long with a “connector plate” of some sort to join them. You shouldnt spam that far even if it was a solid beam. Asking for a disaster to happen.

You need multiple concrete spread footings on each side of the water with a vertical beam or concrete pedestal to support each beam. Either that or piles driven a good ways down.
This post was edited on 2/10 at 8:22 pm


No Colors
Ole Miss Fan
Locker Room
Member since Sep 2010
6956 posts

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

says they had to cut down the span to 66ft

Ok so public road type loads at 66 feet. And I'm trying to run pickups over them at 75 feet. I'm comfortable with that. Thanks for digging into that for me.


tenfoe
Member since Jun 2011
5392 posts

re: OB Engineers: Steel Beams to Make a Bridge
I don’t thjnk you’re gonna beat that price for a structurally sound 75’ bridge


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140
No Colors
Ole Miss Fan
Locker Room
Member since Sep 2010
6956 posts

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

are insane if you think you are going to spam that long with a “connector plate” of some sort

Well, that's why I asked. Because I didn't know.


civiltiger07
LSU Fan
Baton Rouge
Member since Dec 2011
9721 posts

re: OB Engineers: Steel Beams to Make a Bridge
Doesn’t quite work like that but it’s your property.
This post was edited on 2/10 at 8:23 pm


wickowick
LSU Fan
Head of Island
Member since Dec 2006
41006 posts

re: OB Engineers: Steel Beams to Make a Bridge
Used bridges

I saw this website the other day, even if they don’t have what you need or if it is too expensive, it might give you some ideas


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No Colors
Ole Miss Fan
Locker Room
Member since Sep 2010
6956 posts

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

How will you keep the bank from eroding from beneath the bridge?

Bank is relatively stable as this is in a straight shot on the creek. It shouldn't erode much in either direction. But that's why I'm thinking the 89 foot railcar to cover 75 feet. Plus, I will probably weld some extensions of another 12 feet to each end, and then dig them out and set them in concrete. To give it some extra room for the bank to move.

quote:

Tank car culverts are too small/the ravine is too deep?

Way too small. Ravine is not too deep. But is definitely too wide.


Marlo Stanfield
Houston Astros Fan
Member since Aug 2008
1258 posts

re: OB Engineers: Steel Beams to Make a Bridge
See my edit above. Both of those scenarios would cost you a lot of money though. The original price you quoted doesn’t sound bad, but I would request some sort of stamped drawing to verify the bridge is structurally safe. Anyone can build a bridge, but a bridge that collapses and kills someone or multiple people....

Guess that’s the industrial contractor in me coming out. Load calcs and design should be left up to a structural engineer.

I should ask, who owns the creek or whatever it is? Is it something controlled by a governing body? I ask this because if it doesn’t fill too bad, you could install a few good size box culverts to keep it flowing and backfill on each side and on top to build you an earthen bridge.
This post was edited on 2/10 at 8:28 pm


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30
White Bear
USA Fan
NWLA
Member since Jul 2014
5203 posts

re: OB Engineers: Steel Beams to Make a Bridge
Just don’t stop when crossing the bridge.

I need a flat car or something too. NoColors you have a source?
This post was edited on 2/10 at 8:27 pm


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AUCE05
Auburn Fan
Member since Dec 2009
30550 posts

re: OB Engineers: Steel Beams to Make a Bridge
Can you cut a new road in to a better location and span with timber?


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50
LSUA 75
LSU Fan
Colfax,La.
Member since Jan 2019
865 posts

re: OB Engineers: Steel Beams to Make a Bridge
How about a culvert?I have a spot that sounds similar,I had a dozer operator cut a ramp and put in a culvert.I made a road with pit run and it held up well for 20 years.Last winter the culvert got stopped up with pine straw and road partially washed out.I rebuilt the sides of road with sand bags(200) filled with pit run and filled up the center,again with pit run and packed it down well with my tractor.I wish I had put in a bigger culvert.
I have hard clay soil so the ramps have held up well ,if you don’t have clay that might not work.


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10
No Colors
Ole Miss Fan
Locker Room
Member since Sep 2010
6956 posts

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

I need a flat car or something too. NoColors you have a source?

Yeah. The guy who quoted me seems pretty legit, and a fair price. Email me nocolorstd@gmail.com and I'll forward you the quote he gave me. It has all his contact info on it. He's in Mississippi if that matters.


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cgrand
New Orleans Pelicans Fan
HAMMOND
Member since Oct 2009
20097 posts

re: OB Engineers: Steel Beams to Make a Bridge
the bridge you cross to get to my house is a railcar bridge. Your issue in trying to join the 50 ft beams is the connection...you will have to support those beams at the connection or it ain’t gonna work

if you need to span 100’ you either need a 100’ beam (and even them it will deflect) or you need a truss. The web of the truss will spread the load out along the run and allow you to span the creek without deflection.

in any event there is no way to span any distance with a 2-piece structural support. I’d either keep on using the wet crossing and shore up the bank, or bite the bullet and get the railcar. Any 2 piece assembly is going to fail


No Colors
Ole Miss Fan
Locker Room
Member since Sep 2010
6956 posts

re: OB Engineers: Steel Beams to Make a Bridge
Cgrand has spoken. That's all I need to know.....


cgrand
New Orleans Pelicans Fan
HAMMOND
Member since Oct 2009
20097 posts

re: OB Engineers: Steel Beams to Make a Bridge
any stone around there?
dad has a bad wet crossing in Arkansas we wound up blasting some limestone and basically rip rapping the crossing, after a couple of floods the gravel kinda paved it over

every year or so we take a tractor bucket or two and dump it on top.

consider a wooden structure. three or four felled trees could provide your span, stronger than steel


No Colors
Ole Miss Fan
Locker Room
Member since Sep 2010
6956 posts

re: OB Engineers: Steel Beams to Make a Bridge
No stone around. We would have to haul rip rap from the barge port at Vicksburg. Also, the creek is subject to the MS River. We can't cross it when the river is at 42 feet or higher on the Vicksburg gage. Which, in the past was like maybe a few weeks a year. Some times we would go several years in a row without seeing a river that high. But recently it has been something like 22 of the last 36 months. Plus, when the water sits on it for that long, it drops crazy amounts of silt that must be dealt with. It has basically been unusable for most of the past three years.

I'm tired of fixing it. Tired of being subject to it. I'm ready to write one check and be done with it for good. Let it be my son's problem to fool with when he's my age.


Tigerpaw123
USA Fan
Louisiana
Member since Mar 2007
14048 posts

re: OB Engineers: Steel Beams to Make a Bridge
What about a floating bridge, maybe stuff it with rotomolded cooler?
This post was edited on 2/10 at 9:18 pm


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150
highcotton2
Auburn Fan
Alabama
Member since Feb 2010
6230 posts
 Online 

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

From bank to bank it is about 75 feet across (and about 12-15 feet deep). I had a guy come out and quote me an 89 foot railcar bridge, installed, for $26,000.


That actually sounds like a really good price for an installed bridge covering 75’.


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90
Woodbird
Louisiana Tech Fan
Member since Jun 2017
112 posts

re: OB Engineers: Steel Beams to Make a Bridge
It sounds like you've moved on from wanting to span the 75'-0" with two beams in parallel (with the beams spliced somewhere in the middle), but just in case you're still thinking about it here's a little info. There's no such thing as a W12x55 so assuming it's a W12x53 and is fairly old (A36 steel)

A W12x53 spanning 75'-0" considering only the weight of the beam (53 lb/ft) and a 10,000 point load at the midspan (assuming 20,000 lbs split between two beams) the beam will be at 160% capacity and deflect 15.5 inches in the middle. This doesn't take account the weight of the bridge driving surface which will further exasperate the problem.


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