Page 1 of 4 1234 LastLast
Results 1 to 10 of 31
  1. #1
    Member
    Join Date
    Jun 2010
    Posts
    29
    Location
    Franklinton, La.
    Tractor
    Mahindra 4500 w/loader

    Default Need to build a 25' tractor bridge across creek

    New to this website. My project is a 25-30' bridge across a creek in the woods on our property. I have a 1/2 mile of property, I can't get to with my tractor. I have access to a D5 dozer next door where their digging a gravel pit and dump trucks can/will haul dirt over to the bridge location. The location is on the Bogue Chitto River in La. and it floods in winter usually. I know the highest water line and its about 3' above the access road to the bridge location. The bridge WILL go under during these periods( unless I build it high up), only access is by boat then. The current during high water levels is moderate, and has washed out a couple of "Rinky Dink" bridges before. One being made of concrete and buckled in the center. The pieces are still at the location. Also, We made temporary bridge next to the site with a culvert and dirt, the dozer can cross this bridge. I've contacted a local power company where they are replacing many(1,000's) of light poles after hurricane Katrina and many are in near new condition. They will sell for 10ct a foot.
    I planned on using about 6 poles with a abutment footer on each side of the creek 12'Wx6'thick & 8' deep and standing poles up inside the cemented abutment and cut flush with the poles lying on top of the cement footer.
    MY QUESTION IS: Is that too long of a span for these poles?
    Does anyone think I should use Some sort of /\ joists to help support the center. I was hoping not to, so the debris would not build up so bad.

    Any/all ideas welcome. I have included some "rough draft" (not to scale) pictures to show my plans.
    I have a 45hp Mahindra w/loader and 1/2 pickups that want to cross bridge to where I'm building a camp (at a future date)
    BE SURE TO USE THE ZOOM TOOL WHEN VIEWING PICS.
    http://s785.photobucket.com/albums/yy139/deanfitz/

    Thx, Capt Dean
    Last edited by deanfitz; 06-19-2010 at 03:46 PM. Reason: insert url

  2. #2
    Elite Member CurlyDave's Avatar
    Join Date
    Dec 2005
    Posts
    4,081
    Location
    Grants Pass, OR
    Tractor
    JD TLB 110

    Default Re: Need to build a 25' tractor bridge across creek

    I think you need to talk to a professional engineer.

    My gut tells me that the poles are not really up to this task, but I have been wrong on that kind of thing before.
    40 Acres on a hill - fantastic view. JD 110 TLB, 4-n-1, 12" bucket, 18" bucket, Addington thumb, rock bucket (doubles as root grapple)

    Not only do we not understand the universe, if someone explained it to us, we would not know what he was talking about.

    Isaac Asimov

  3. #3
    Member
    Join Date
    Jun 2010
    Posts
    29
    Location
    Franklinton, La.
    Tractor
    Mahindra 4500 w/loader

    Default Re: Need to build a 25' tractor bridge across creek

    Thanks, Curly
    Did I mention that the draft I'm using is a replica of one that has been there for 28 yrs. It is about 14 miles down river, I have seen it but have no pics. They cross it with everything, even a mobile home.
    Thx, Dean

  4. #4
    Veteran Member scoutcub's Avatar
    Join Date
    Aug 2008
    Posts
    2,164
    Location
    Ohio
    Tractor
    Yanmar LX4900//Cub 7532//Cub Yanmar SC2400

    Default Re: Need to build a 25' tractor bridge across creek

    Dean;

    I'm looking to something like this in the future, but was planning on 10 or 12 poles/trees across...then plank across the top. Even that I'm not to eager to ease my 10 ton dozer over, not the mention the 15 ton trackhoe. A center support would cut your needed capacity in half, and if the tracks could span the end abutment and middle saddle, you'd be set. Figure a D-5 depending on model, is anywhere from 22K to 30K lbs...... might be time to sit down with a structural engineer!

  5. #5
    Veteran Member
    Join Date
    Jul 2005
    Posts
    1,924
    Location
    NH seacoast & Coos County
    Tractor
    Kioti DK45S

    Default Re: Need to build a 25' tractor bridge across creek

    deanfitz, Keep in mind that wood bridges can become rafts in high water. You might be better to spend on steel than have your wood bridge float away. Our snowmobile club has pole bridges of similar span that carry heavy trail groomers without issue. MikeD74T

  6. #6
    Member
    Join Date
    Jun 2010
    Posts
    29
    Location
    Franklinton, La.
    Tractor
    Mahindra 4500 w/loader

    Default Re: Need to build a 25' tractor bridge across creek

    We are planning to wrap the poles with cable and anchor to the concrete footers. Plus, the cross 4x12" planks with be lag bolted to the poles standing in the concrete footers. This bridge is only going to need to support 1/2ton pickups and a 45hp tractor sometimes. I'm thinking 5,000 lb max.

  7. #7
    Veteran Member scoutcub's Avatar
    Join Date
    Aug 2008
    Posts
    2,164
    Location
    Ohio
    Tractor
    Yanmar LX4900//Cub 7532//Cub Yanmar SC2400

    Default Re: Need to build a 25' tractor bridge across creek

    Oops, sorry I thought you were wanting to get across with the D-5.....it sounds a whole lot better now!

  8. #8
    LD1
    LD1 is online now
    Super Member LD1's Avatar
    Join Date
    Apr 2008
    Posts
    9,701
    Location
    Central Ohio
    Tractor
    Kubota l3400

    Default Re: Need to build a 25' tractor bridge across creek

    I am thinking that utility poles would not be up to 5000lb loads.If you are using 6, then each one will need to be able to support the planking, as well as 1000-1500lbs right in the middle. A 8-10" round wood pole that is probabally southern yellow pine, is not a safe bet IMO.

    When I was sizing beams to support an upstairs in my pole parn, which needed to span 30ft and be capable of the 1000-1500 lb load in the middle(to yank engines and such), and just light storage above, A w10 x 19 I beam was minimum. Price for two was ~$900. I started looking to go the wood beam route. That would have required a 4 x 16 on edge minimum. And I dont think a utility pole is near as strong as that. Since you are talking similar loads and an even steeper penalty for failure, I'd go with beams. I ended up using w12 x 35, as I got them used a a great deal.

    And since you are already talking roughly $5k Just in your concrete footers, why skimp on the rest?
    Last edited by LD1; 06-20-2010 at 11:19 AM.
    ".........there is only one way to find out."
    "Ok, hold my beer and watch this.........."


    Ford 5500 Backhoe
    Kubota L3400GST W/LA463 FEL
    2005 Dodge 3500 4x4 Diesel
    8N Rebuilt and restored
    Bushhog 306
    3 Homemade wood hauling trailers
    Dolmar 6400 84cc ported
    Sachs-Dolmar 120SI Ported
    (4) Sachs-Dolmar 116SI Ported
    Dolmar PS540
    Sachs-Dolmar 115i
    Sachs-Dolmar 117
    Sachs-Dolmar 112

  9. #9
    Super Member RickB's Avatar
    Join Date
    Sep 2000
    Posts
    7,038
    Location
    Eastern NY
    Tractor
    Case 885, JD 730D, Ford 4000

    Default Re: Need to build a 25' tractor bridge across creek

    The live loading is one thing, but withstanding flooding forces will be the real engineering challenge. Perfectly good telephone poles snap off from straight line wind loading all the time.

    Free advise is worth exactly what you pay for it.
    Folks that are willing to spend thousands of dollars and countless hours on a project without spending a few hundred on professional advise simply amaze me.
    We have too much gun control.
    What we need is more idiot control.

  10. #10
    Veteran Member
    Join Date
    May 2009
    Posts
    1,616

    Default Re: Need to build a 25' tractor bridge across creek

    If your creek has that much of a flow under server conditions then I would expect that the underling structure will clog with debris and you will be in effect building a dam. I would be talking with an engineer and be mindful of any waterway, EPA regulations before you turn a spade of dirt.

Page 1 of 4 1234 LastLast

Similar Threads

  1. Creek taking my yard.
    By Steelfan in forum Rural Living
    Replies: 11
    Last Post: 03-27-2012, 08:46 AM
  2. build a bridge, get over it
    By MRHURT in forum Projects
    Replies: 77
    Last Post: 06-21-2010, 11:43 AM
  3. Stump grinder build Idea.
    By xrjohndeere in forum Build-It Yourself
    Replies: 14
    Last Post: 02-10-2010, 06:17 PM
  4. My dump trailer build
    By leveller in forum Build-It Yourself
    Replies: 58
    Last Post: 01-26-2010, 10:48 PM
  5. To Build OR To Buy...That WAS The Question
    By cuoffroad in forum Attachments
    Replies: 2
    Last Post: 01-24-2010, 01:39 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2013 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.