DIRECTINAL DRILLING STORM SEWER
DIRECTINAL DRILLING STORM SEWER
(OP)
Does anybody see any problems that could occur if I call out directional drilling an 8" polyethlene storm sewer at 1.00% under an existing concrete pedestrian tunnel under a railroad spur track? Pipe will be used for gravity draining a couple trench drains for a pedestrian walkway down to tunnel. Tracks are 20' above the pipe and tunnel floor is approximateley 4' above the top of pipe and new pipe will be approximately 10' above an existing 54" sanitary trunk line built in 1920s. Do you see any soil pressure stresses that could damage the tunnel or sanitary line?





RE: DIRECTINAL DRILLING STORM SEWER
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: DIRECTINAL DRILLING STORM SEWER
PE is great stuff, but really doesn't like external pressure or even very small out of roundness and the thinner it gets the worse it is.
A conservative view would be water at the depth of the pipe then ask the pipe vendor what he will advise for long term external pressure.
The attached is a reference from a vendor I received once.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: DIRECTINAL DRILLING STORM SEWER
RE: DIRECTINAL DRILLING STORM SEWER
2. Probably need to have the railroad approve HDD.
3. Most HDD projects have a difficult time constructing a sewer grade uniform. Perhaps this can be offsite by using a steeper slope. You will have also additional problems because of the polyethylene is not ridged and will snake around a bit.
RE: DIRECTINAL DRILLING STORM SEWER
RE: DIRECTINAL DRILLING STORM SEWER