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I would love help if anyone is able to offer any. I need to make a ramp to move equipment down a 3.5’ retaining wall. The ramp is to be 12’ long. I was going to use two 6” x 6” beams of Douglas fir, bolted together using 3/4” all thread. I don’t know how to calculate this.

Question, will a 5.5” deep by 11” wide by 13’ long ramp of Douglas fur support a piece of machinery that weighs 4300 pounds

Track length on the equipment is about 4.5‘.

Thank you so much for your help and time.

Images AddedRamp illustration

Loads

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    $\begingroup$ I suggest building the ramp by earth then clad with wood beams. $\endgroup$
    – r13
    Aug 9 at 0:34
  • $\begingroup$ 11" wide ramp? ... that sounds like a tightrope act ... is the machinery self-balancing somehow? $\endgroup$
    – jsotola
    Aug 9 at 1:56
  • $\begingroup$ @r13 If the OP can get access for machinery to move several tons of earth to make a ramp (and refill the hole afterwards), it might be quicker and easier just to hire a crane. $\endgroup$
    – alephzero
    Aug 9 at 12:46
  • $\begingroup$ @alephzero Why not. Do not use comment block to imply impractical/unsafe practice/solution, please. It is quite unprofessional and exposes the lack of knowledge on common practices. $\endgroup$
    – r13
    Aug 9 at 13:12
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    $\begingroup$ Maybe rent ramps used by trucks. Ramps on utility trailers are usually 8 to 10 ft long aluminum. may also work. I used two ramps, rough sawn 2 X 10 pine for a 1000 lb machine ( many trips) that were 8 ft long .so I expect you proposed ramp will be strong enough $\endgroup$ Aug 9 at 14:04

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