Pipe sleeves at Road crossing

[jj7484]

Pipe sleeve made up of carbon steel pipe, 30" diameter with 3/4" thickness is to be installed in a road crossing which is 6.0 meters wide. This pipe sleeve is supported with 6-8" diameter steel piles driven 8.0 meters depth spaced equally. My question? Is the pipe support really required for road crossing since the pipe sleeve is directly supported by the soil. I believe this is over design.

 

[cvg]

your pipe casing should support all loads without piles

 

[rconner]

This sounds like a quite special design (am curious what is soil etc. strata and supporting strength below prospective casing?)

 

[emmgjld]

This has the feel that a LOT more information is required before your question can be dealt with. There have been a few occasions that I have supported buried utilities, none of them were simple.
Info required is not limited to:
What is the soil profile? with specific Geotechnical info.
Who recommended the pipe support?
Does the area have a history?

 

[stanier]

If the soil is so dodgy to need piles for the casing I would be considering horizontal direction drilling the main pipe and avoid the challenge.

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His Holiness the Dalai Lama.

http://waterhammer.hopout.com.au/

 

[cvg]

this is a road crossing. presumably the road has already been stabilized sufficiently to handle traffic loads without settlement. the additional load of a pipe on the subgrade is relatively small and should not cause additional settlement over and above what might be caused by traffic load. The carrier pipe is also inside a casing. So traffic loads would not bear on the carrier pipe. I would want to see a clear need for the piles and for the casing otherwise this smells like over design as suggested by the OP.

 

[jgailla]

Also, if the road settles, as it usually will, you will get a hump in the road as the casing does not settle.