Twinwall plastic is the complete answer for this sort of application. I installed 4 culverts for crossing points across deep ditches on my marsh last spring. As long as you have at least one diameter of pipe thickness of fill above it (i.e. 3 feet of fill for a 36" pipe) they will stand terrific loads. In one smaller ditch I put an 18" pipe & only about 6" fill over it & there is zero deformation while driving over it with 2 tons of tractor plus about 1 ton .
In UK they come in 20 ft lengths with separate couplers.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
... [Read Article]
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