A 60' walk/4wheeler bridge......:

   / A 60' walk/4wheeler bridge......: #1  

MotorSeven

Elite Member
Joined
Aug 17, 2005
Messages
4,176
Location
NE TENN (Hancock Co)
Tractor
Kioti DK40SE Hydro
I have been thinking about a bridge over our creek for 7-8 years. It's 50+' bank to bank...so it was a lot of thought.

I came across a welded bridge frame at an auction. It was built out of mobile home frame(10" 1/8th I-beam) 60' long, 45" wide & it looked sturdy enough. I cut it in half, to load it and get it home where I welded it back together. I used the Kioti to pull it down to the creek. I attached a cable in a Polpar tree on the opposite bank and pulled it across with the tractor(bridge on it's back). When I tried to turn it over it pretzled(yes my splice held), so I pulled it back across and used the FEL to straighten it back out. I have a 25KW pto generator, so I hooked it up and used my Millermatic 210 to weld in 10" I-beam cross braces every 6'(the original one's were 4" and real thin metal) I added a support under the bridge angles for extra support.
The second try was succesfull, so I poured concrete footers at each end and bolted the frame to the footers. 2x6x20 PT(120') was lag bolted to the top of the bridge I-beams, then 4' 2x6 PT planking screwed down with 3" Torx deck screws. This really made it more stable, but I am still going to sink 2 utility poles at each end, run a cable across and stanchon the bridge is several places with cable. Only then will I drive my wheeler across. So far I have about $500 in it(and a ton of time:thumbsup:). This creek floods several times a year, so that is why it is so high...to keep debris from catching it and pulling it down stream.

Welding it back together:
bridge.jpg

Note the tiny cross braces:
bridge2.jpg


On the road to the creek:
bridge4.jpg


bridge5.jpg
 
Last edited:
   / A 60' walk/4wheeler bridge......: #2  
Lookin good moto! I need to do something similar in the future over a creek.
Whatever happened with the house.....on hold?

Good to see you back!


Frank
 
   / A 60' walk/4wheeler bridge......:
  • Thread Starter
#3  
Footer(it's 2'deep and rebar'd):
Bullets005.jpg


Cutting the planks:
Bullets004.jpg
planks:

Just say "No" to crack:
Bullets006.jpg
 
   / A 60' walk/4wheeler bridge......:
  • Thread Starter
#4  
Bullets009.jpg


It's about 12" off the water:
Bullets010.jpg


And this is what is planned to reinforce it:
Bridgesupports.jpg
 
   / A 60' walk/4wheeler bridge......: #6  
Nice Plan! Well Done! :thumbsup: I need to follow your post and progress. I have a similar need over a swamp....tho not so high.
 
   / A 60' walk/4wheeler bridge......: #7  
VERY nice thanks for the pictures
 
   / A 60' walk/4wheeler bridge......: #8  
Motorseven
Compliments on a job (big job) well done.

I'd only suggest adding some cable from the post tops to the bridge beams to stiffen up the bridge (red lines). As shown, there won't be much if any stiffness or lift on the center of the deck.
 

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   / A 60' walk/4wheeler bridge......:
  • Thread Starter
#9  
Bt, I will try an rustle up enough cable for that..thanks.

Foggy, I thought the proper Yank term was "slough" or "slew"...?

Back home in Louisiana it was all 'swamp":D
 
   / A 60' walk/4wheeler bridge......:
  • Thread Starter
#10  
I did get over 650 lbs of buddies on the bridge & it looked like a half inch of deflection in the middle. I still won't drive on it until it gets the cables since I am worried about the oscilliation from the wheeler tires.
 

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