running 4' galvanized pipe ?

[wellbuilt]

I looked at a job to day for a farmer . He has a 4'deep x 8'wide drainage ditch and wants to cross it with a 350 dump truck and trailer . He wants me to dig out the stream bead to lower the 4' pipe 18" from grade and fill it with rip rap 4" stone .Ive never tried this with out pouring concrete on the ends and in the center between the pipes . I'm just working buy the hour and it wont take more then a day but i would like to see the job work out . There isn't much water in the stream . How should he finish this off . any help will be appreciated. John

[gammon landscaping]

talk to the people you buy the pipe from they will tell you how much cover needs to be over the pipe they are selling, there are spec sheets for this, with that little of cover you will need to get a thicker pipe probbably

[ksss]

Thats a big culvert. Does it need to be that big? If so you may get by with 18" but more would be better. It would help if you compacted around the culvert with a hoe pac or jumping jack. It will lessen the stress on the culvert. If vehicles sink when approaching and crossing the culvert it causes a lot of excess stress and will likely fail with a min. amount of cover.

[Gravel Rat]

Why is he putting in a culvert you could build a bridge out of a old used flatbed train car its done here quite abit. A 8 foot wide ditch being narrowed down to 4 foot wide ditch isn't the best of idea.

The use of 48 inch diameter galvinized culverts are used here for stream crossings or there is large amounts of water going through it. If he is only driving a 1 ton truck with a trailer over it 18 inches of cover should be fine.

Like I said I think I would be building a bridge of some sort.

If that drainage ditch ever gets ripping with lots of water it will wash out the material around the culvert. You would have to try taper the ditch on either end of the cuvert to re-direct the water to funnel through the culvert.

[wellbuilt]

[QUOTE=Gravel Rat;2855924]Why is he putting in a culvert you could build a bridge out of a old used flatbed train car its done here quite abit. A 8 foot wide ditch being narrowed down to 4 foot wide ditch isn't the best of idea.

The use of 48 inch diameter galvinized culverts are used here for stream crossings or there is large amounts of water going through it. If he is only driving a 1 ton truck with a trailer over it 18 inches of cover should be fine.

Like I said I think I would be building a bridge of some sort.

If that drainage ditch ever gets ripping with lots of water it will wash out the material around the culvert. You would have to try taper the ditch on either end of the cuvert to re-direct the water to funnel through the culvert.[/QUOTE

The funny thing is the 4 foot piping washed out before .I have to go down stream to get them . What do you think about running 2 4' pipes side buy side with 12" between them ? John

[RockSet N' Grade]

Metal, ADS (ribbed plastic with smooth interior), or some kind of concrete pipe.....your choice. Each has its own spec's for a bottom and top coverage for traffic. I guess preparing the bottom with some material to stablilize it would be your first step. Set your pipe, fill in the sides with compactable fill, cover the top and then (you are right) seal the open ends with a concrete to prevent erosion of the material around the pipe.......top, sides and bottom. Lots of guys like to cheat on the concrete thing.......has given us alot of work going back to repair and redo.......All your work will be for nothing if you don't seal around the pipe with concrete, so don't miss this step.

[wellbuilt]

Thanks for the help John

[YellowDogSVC]

I use 15", 18" and 24" ABS, uv treated corrugated/smooth interior (double wall) culvert pipe out here in the country. Over the last ten years, 100% have held up to 52k lb tandems, heavier 20yd tractor trailer dumps, my f350 and bobcat every day, a d5m, a CAT 928, and endless torrential rains and floods. I like the ABS because it's easy to work with and very strong. I try and get 12" of crushed base (limestone) to cover but that's in an optimum setting. I usually end up with about 5-6" of fill over the pipe if it's a shall draw. For the deeper ones, they get covered even more. Never had one fail as long as they are set right and covered and compacted.

[Gravel Rat]

Without pictures to see what your dealing with its hard to give you some ideas.

[Scag48]

ADS is nice, it's a tad bit cheaper out here than traditional culvert (CMP) and it won't rust out. However, you need more cover with ADS than you would with CMP.