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Building a Bridge

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05-23-2005 05:13:04

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Read the post down below about telephone pole for bridge support. We have a bridge with poles that crosses a creek & span about 10'. The poles have rotted & it is time to replace the bridge. What are some recomendations you experts have for replacement?

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Leland

05-23-2005 21:35:11

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Re: Building a Bridge in reply to MH, 05-23-2005 05:13:04

We always used old under ground gas tanks from filling stations cut ends out and they make a fine bridge and they are cheap.

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bob in KY

05-23-2005 10:12:11

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Re: Building a Bridge in reply to MH, 05-23-2005 05:13:04

Recently, I visited a friend's farm in Illinois. He got in touch with a mobile home dealer and found out where they disassemble and dispose of old mobile homes. He purchased a chassis with wheels intact. He towed it home with his pick-up truck and dragged it across his creek. He unbolted the wheels and axles and bolted walmanized lumber for decking. He just sat the frame on the ground and it eventually settled in. It works very well. He drives his bulldozer over it. I think he gave $50 or $100 for the frame and bought the lumber from the local lumber yard. The frame is about 7 or 8 feet wide and his decking is 10 feet wide. His finished bridge is about 42 feet long, but you could cut it to whatever length you need. I am in the process of finding a salvage yard in Kentucky and trying it myself. I will cut oak off of the farm and cut it up with my sawmill.

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05-23-2005 11:39:25

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Re: Building a Bridge in reply to bob in KY, 05-23-2005 10:12:11

Thats a good idea. I'll have to look around and see if I can find some old frames. Thanks.

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thurlow

05-23-2005 09:41:59

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Re: Building a Bridge in reply to MH, 05-23-2005 05:13:04

I've built my share, though never over "moving" water requiring a permit; railroad tank car..... .with the ends already removed..... ..is by far the simplest/long term solution, if you can't find used culverts that would do. It's been a few years since a bought a tank car for that purpose, but undoubtly they're still available. I've also known of folks buying a salvage 40 ft flatbed trailer and just throwing it across and letting it rest on the ground.

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JMS/MN

05-23-2005 11:06:39

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Re: Building a Bridge in reply to thurlow, 05-23-2005 09:41:59

Rats! When I first read your msg I thought you were building a 'Round bridge of Madison County'!-but I didn't think you lived in Iowa. 90 degrees in layout makes a big difference.

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thurlow

05-23-2005 13:36:13

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Re: Building a Bridge in reply to JMS/MN, 05-23-2005 11:06:39

Okay, you've made me chuckle; when I went back and read what I had written, I can see that it might look like I was proposing the tank car going ACROSS the creek rather than IN the creek..... ...as a culvert.

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JMS/MN

05-23-2005 08:18:49

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Re: Building a Bridge in reply to MH, 05-23-2005 05:13:04

In the mid-60s, as part of our Green Beret training, we had to construct a bridge using whatever timber was in the area, and it had to carry a deuce-and-a-half- with us in it, after we were done. If you could find the Special Forces Handbook (possibly on the Barnes & Noble site), you could get some info on timber trestle bridges, moment, and bent calculations using different materials, although most of the info is on how to destroy them. Another Army manual is the engineer's bible- FM 5-499- also available on line through some Army sites. Personally- I like paul's idea- just get some big-butt steel beams, comparable to bridges in your area, do it once and be done with it. My shop hoist hangs from a single 6 1/2 inch by 12 inch steel beam, 19 foot span, and has had up to two tons hanging from the center of it. Couple beams like that would certainly be a good support for decking over a ten foot stream.

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05-23-2005 08:16:30

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Re: Building a Bridge in reply to MH, 05-23-2005 05:13:04

Thanks for the advice, I agree with wanting to get away from telephone poles, they are just too weak. Hopefully I can find some cheap I beams.

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JMS/MN

05-23-2005 08:22:25

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Re: Building a Bridge in reply to MH, 05-23-2005 08:16:30

Around here I can usually find them for 15-20 cent per pound. Sellers don't care to cut the extra off, but I usually find close to the lengths I need. Last portable hoist frame, I had less than a foot of waste.

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paul

05-23-2005 07:35:50

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Re: Building a Bridge in reply to MH, 05-23-2005 05:13:04

As stated, the local/state/US epa-types need to get involved in 99% of the bridges made any more.

I'd look for some I beams, then you don't have to fool around with it any more. Cheapest thing in the long run, rebuilding old rotten wood every few years is a money hole... Dad put in 2 concrete ends, I beam span, 3-4" wood plank bridges in '64 & '74. Still going strong, takes the tractors & combines, spans a 14. county ditch, no new permits every time you need to rebuild, not wet combines. Sure were cheap bridges!

Do it right or don't do it. Can't imaging taking a pickup across old utility poles. Shutter.

--->Paul

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RustyFarmall

05-23-2005 07:00:25

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Re: Building a Bridge in reply to MH, 05-23-2005 05:13:04

Pay a visit to your local county yard. You may be able to find a salvaged steel road tube. Drop it into the creek, fill and cover with dirt, and you're done.

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Brian G. NY

05-23-2005 07:08:31

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Re: Building a Bridge in reply to RustyFarmall, 05-23-2005 07:00:25

Oh...if it were so easy in New York State! The Dept. of Environmental Conservation has to get involved whenever any stream is bridged; can be a real hassle. " Course if it"s out in the "back 40" where it"s not readily seen, you know I"d consider Rusty"s solution. A local sawyer tells me that Tamarack (Larch) makes good deck planking; strong and rot resistant.

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