Wooden bridge for 2000# tractor to cross creek

jmc

Elite Member
Joined
Jul 21, 2003
Messages
2,632
Location
SW Indiana
Tractor
Ford 1920 4x4 (traded in on Kubota). Case 480F TLB w/4 in 1 bucket, 4x4. Gehl CTL60 tracked loader, Kubota L4330 GST
if your decking boards are individually cantilevered outboard of the 6x12s, strapping all the ends of all your decking boards together would distribute your load among several adjacent boards.
 

Doughknob

Gold Member
Joined
Oct 26, 2013
Messages
266
Location
ohio
Tractor
X500, CT4045
How wide are your wheels, on the 2000lb tractor?
 
Last edited:

fried1765

Super Star Member
Top Poster Of Month
Joined
Jan 6, 2015
Messages
10,183
Location
Northeast & FL
Tractor
Kubota L48 TLB, Ford 1920 FEL, 8N Ford, Gravely 12 HP "Professional", 48" SCAG Liberty
If you can try and find a sawmill that can cut up some spruce for you, there is a mill in Drain just off the 5 you could try. Spruce is tough stuff and is traditionally used for scaffold planking and really takes a beating.
The type of spruce that I am familiar with also rots more rapidly than most other lumber.
Hemlock is a bit more rot resistant if you have any in your area.

The OP does not mention the span of the 6x12's, but dead load weight must be considered.
I would suggest keeping the decking material weight to an absolute minimum.
 

Williy

Platinum Member
Joined
Apr 26, 2020
Messages
900
Location
Texas
Tractor
Yanmar YT 235C Yannar YRC 60 rotary cutter, Yanmar RT72 rotary tiller B75 Backhoe & bucket & thumb
If you can get some oil field pipe and put the wood
over the top or just use all pipe??
In Texas we have cattle guards
1623611483661.png


willy
 

Gee Ray

Silver Member
Joined
Nov 30, 2019
Messages
197
Tractor
Bota L2501, NH TL80A
You need to check the weight you can load onto 20 foot long 6 x 12. I think you would be ok with the JD x330 as it is around 500 pounds but to go any heavier I do not believe the beams are big enough.
 

fried1765

Super Star Member
Top Poster Of Month
Joined
Jan 6, 2015
Messages
10,183
Location
Northeast & FL
Tractor
Kubota L48 TLB, Ford 1920 FEL, 8N Ford, Gravely 12 HP "Professional", 48" SCAG Liberty
You need to check the weight you can load onto 20 foot long 6 x 12. I think you would be ok with the JD x330 as it is around 500 pounds but to go any heavier I do not believe the beams are big enough.
Two problems!
Very long span for 6 x 12, and only two beams!
I would not put more than 500 pounds live weight on that bridge!
 
Last edited:

oosik

Super Star Member
Joined
Aug 22, 2012
Messages
15,503
Location
AMBER, WA
Tractor
2009 Kubota M6040
BCP - that was my exact thought. Build it for your 2000 pound tractor and somebody, like me, tries to cross with my 10,000 pound Kubota. And you can assume that a whole lot of folks have no idea how much their tractor weighs.

What if a friend attempts to drive across with a pickup load of gravel.
 

bdog

Elite Member
Joined
Mar 26, 2004
Messages
2,613
Location
Texas
Tractor
Kioti RX 7320
20’ isn’t very far. Look at some trailers and see how they are constructed. Wood scares me because it rots. I wouldn’t assume the 6x12s are good if the 2x6s are rotten. I would replace the main beams with some I-beam. Steel supplier should have charts for acceptable load on a 20’ span. Might even go with four beams so your decking doesn’t have to be as strong. I have fell through a wooden bridge in a pickup and isn’t fun. I didn’t crash into the creek but two of my tires broke through.
 
Last edited:

jaxs

Veteran Member
Joined
Jul 31, 2017
Messages
2,081
Location
North Tx
Tractor
841 ford,MF65,Cub Lowboy,,Ford 600
if your decking boards are individually cantilevered outboard of the 6x12s, strapping all the ends of all your decking boards together would distribute your load among several adjacent boards.
I vote for this.
 

Erik M

Silver Member
Joined
Sep 26, 2016
Messages
133
Location
Mount Albion, PEI, Canada
Tractor
John Deere 1840
If you have a concrete abutments I would look for some salvaged steel I beams to replace the 6 x 12 and use at least three, and then your problems should be solved. Steel isn’t cheap but you will only fix it once.
 
 
Top