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Posted: 2/20/2010 11:37:24 AM EST
[Last Edit: 2/20/2010 11:38:22 AM EST by FlyingBrass]
I need advice on how to build a bridge down at my deer camp over a small creek. There is an old railroad crossing there so that is the location I want to build it. Water is 5 or 6 feet deep most of the time but it will dry up in a drought or get deeper in a flood situation. A foot bridge or one for an atv would be ok to save money and time. What are your suggestions?
Edited to add, we currently just cross it in a boat and keep a rope tied across it and just pull ourselves across.
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Posted: 2/20/2010 11:39:42 AM EST
[Last Edit: 2/20/2010 11:40:44 AM EST by arowneragain]
50 feet goes beyond 'small'.

The bridge I built a few years back over our creek was 20'. The 20' CCA poles I bought for it were BARELY long enough. 50' is beyond the realm of bubba carpentry, unless you can sink some pilings into the creek bed.



Edit: BUt if you want a cheap bridge, go to a junkyard and see if you can buy the boom off a crane or dragline - you'll need two - and use those as rails.
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Posted: 2/20/2010 11:39:44 AM EST
Photos would help, lot go into bridge design and most of it does with ramps in and out and support.
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Posted: 2/20/2010 11:42:05 AM EST
Photos would help, lot go into bridge design and most of it does with ramps in and out and support.
And mebbe, just mebbe, you won't be alone
Some cold and fearsome night
When to live you must find your tree or wall,
And mark well your bright front sight!!
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Posted: 2/20/2010 11:42:10 AM EST
Swinging bridge, I did one several years back as my eagle scout project.
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Posted: 2/20/2010 11:43:37 AM EST
A lot of people around here use an old flatbed train car with all the running gear removed.
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Posted: 2/20/2010 11:48:01 AM EST
One of these?




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Posted: 2/20/2010 11:49:29 AM EST
Uhm, 50 feet isn't an easy task especially if you want ATV access.

Things to consider:
Materials, type of soil under the water, bedrock, erosion rates for the creekbed and walls, saturation rates for both of those, cost of pouring concrete to account for those two factors, and a bunch of other stuff that a civil engineer would know.


The math for the bridge is pretty easy and could be scripted into matlab for optimization and FEA pretty easily as truss structures are easy to analyze.
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Posted: 2/20/2010 11:49:41 AM EST
Just a FYI, it sounds like the creek may be big enough to be considered "Waters of the US" and under the jurisdiction of the US Corps of Engineers. Does it ever dry up? If no, it probably is.

A portion of the land around it may include floodplain - Doing any work within the floodplain, including building a bridge without proper permits, is bad ju-ju.

Proceed with caution.
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Posted: 2/20/2010 11:51:35 AM EST
look for a old rail car, use the bottom of it. I have one on my place that's a flat bottom rail car just laid across the river.

cheap to find, usually free-expensive to move
panic and mass hysteria seem to be a marketing tool these days...
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Posted: 2/20/2010 11:52:42 AM EST
I've seen bridges made of old crane booms. Not the telescoping kind.
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Posted: 2/20/2010 11:57:30 AM EST
You could buy an old 18 wheeler trailer and lay across the creek.
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Posted: 2/20/2010 11:57:44 AM EST
Fuck Obama. *

*Just covering myself, in case I forgot to post it in my reply
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Posted: 2/20/2010 11:58:43 AM EST
Just build a ramp and jump that sucker!
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Posted: 2/20/2010 11:58:53 AM EST
Here's an 80 ft option
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Posted: 2/20/2010 11:59:55 AM EST
[Last Edit: 2/20/2010 12:00:30 PM EST by M4Real]
Use a shipping container and then would have a covered bridge.


eta: might need two.
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Posted: 2/20/2010 12:00:50 PM EST
[Last Edit: 2/20/2010 12:02:23 PM EST by sprayandpray]
Originally Posted By dalebmartin:
You could buy an old 18 wheeler trailer and lay across the creek.


That would give him 18" of bank overlap on a 50 " creek (standard trailers are 53') Kinda on the skimpy side IMHO

Really would depend on how close to 50' his creek really was
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Posted: 2/20/2010 12:01:10 PM EST
50 ft is a big bridge.
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Posted: 2/20/2010 12:03:29 PM EST
Buy a Bailey Bridge. Surplus.
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Posted: 2/20/2010 12:05:52 PM EST
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Posted: 2/20/2010 12:11:36 PM EST
Originally Posted By sprayandpray:
Originally Posted By dalebmartin:
You could buy an old 18 wheeler trailer and lay across the creek.


That would give him 18" of bank overlap on a 50 " creek (standard trailers are 53') Kinda on the skimpy side IMHO

Really would depend on how close to 50' his creek really was


Standard flatbed trailers are 48'.
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Posted: 2/20/2010 12:12:56 PM EST
I use to work for a company that made loggging road bridge.

2 or 3 WWF's with nelson studs groups, then they would bring in a load of precast concrete panels with holes in them to match up to the nelson stud groups, once the panels were places, they'd fill the holes with grout.

If the embankments were already done before the beams arrived, bridge would be having traffic in 3-4 days.
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Posted: 2/20/2010 12:17:10 PM EST
timber mats
Sleep on top of the trailer with a loaded gun or two. If someone tries to gain entry, blow a hole in the top of their head to let the stupid out....cmjohnson


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Posted: 2/20/2010 12:58:45 PM EST
OK! I'll try to actually measure the creek this week.
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Posted: 2/20/2010 1:00:11 PM EST
Originally Posted By NineLivez:
Originally Posted By sprayandpray:
Originally Posted By dalebmartin:
You could buy an old 18 wheeler trailer and lay across the creek.


That would give him 18" of bank overlap on a 50 " creek (standard trailers are 53') Kinda on the skimpy side IMHO

Really would depend on how close to 50' his creek really was


Standard flatbed trailers are 48'.


I was thinking he could go redneck historical and put up a covered bridge
Vote from the hedges, the rooftop, while giving excellent fields of fire, leaves you silhouetted and takes away some of your options on egress. Rooftops are where we look for snipers automatically -nukldragr
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Posted: 2/20/2010 1:13:49 PM EST
Originally Posted By sprayandpray:
Originally Posted By NineLivez:
Originally Posted By sprayandpray:
Originally Posted By dalebmartin:
You could buy an old 18 wheeler trailer and lay across the creek.


That would give him 18" of bank overlap on a 50 " creek (standard trailers are 53') Kinda on the skimpy side IMHO

Really would depend on how close to 50' his creek really was


Standard flatbed trailers are 48'.


I was thinking he could go redneck historical and put up a covered bridge


OK, that made me
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Posted: 2/20/2010 1:35:00 PM EST
Originally Posted By Keith_J:
Buy a Bailey Bridge. Surplus.


+1 second reference to a bailey bridge I've seen today
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Posted: 2/20/2010 3:20:48 PM EST
It would be easier to make your ATV float!
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Posted: 2/20/2010 3:35:00 PM EST
How about a number of culvert pipes laid side by side, and covered with rock?
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Posted: 2/20/2010 3:38:13 PM EST
Since you don't know what your doing(neither would I) videotape the whole process. That way you can offset the materials cost with your winnings from America's Funniest Video's.
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Posted: 2/20/2010 3:43:58 PM EST
stay alert, stay alive

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Posted: 2/20/2010 3:48:31 PM EST
old rail cars and big i-beams
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Posted: 2/20/2010 4:12:38 PM EST
here is a way to build one using lumber not sure if you could get 50 feet but worth a shot

http://216.104.173.251/home.html
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Posted: 2/20/2010 4:16:48 PM EST
Step 1: Set up a POW camp.....
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Posted: 2/20/2010 4:17:39 PM EST
I saw a bridge at a boy scout camp in VA in 1980. It was rope, 2x4's and plastic 30-50 gal drums. The way they set it up was so it had some play to allow for the rise and fall of the river. It was a little shaky but more than easy to cross. It would easily support 4-5 people at a time and was over 50 ft long.
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Posted: 2/20/2010 4:20:49 PM EST
I dont really think this is the type of thing you want to "backyard mechanic".
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Posted: 2/20/2010 4:24:16 PM EST
Could you get away with putting in a bunch of culvert pipes and just put in a road bed?
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Posted: 2/20/2010 4:29:14 PM EST
Man up....



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