Curvilinear Sanitary Sewer
Curvilinear Sanitary Sewer
(OP)
I am considering installation of a curvilinear sewer for a sanitary 'relief' sewer project. The pipe would be approx. 10-inch (HDPE or fusible PVC), installed via directional drilling, approx. 600 lf, no lateral connections, and good slope (more than minimum required slope). The two end locations are fixed (one existing and one proposed manhole). I also want a manhole in the middle, however the location is somewhat flexible. The reason for a 'curved' sewer would be to save a few dollars utilizing only one set-up of the drill rig. The middle manhole would be installed after the curved line is in-place.
Has anyone done something similar to this?
What are the disadvantages/potential problems of a curvilinear sewer?
What is the minimum recommended horizontal radius?
All comments welcome.
Has anyone done something similar to this?
What are the disadvantages/potential problems of a curvilinear sewer?
What is the minimum recommended horizontal radius?
All comments welcome.





RE: Curvilinear Sanitary Sewer
Should a wire rope be used to pull a pipe cleaning device through the sewer, the wire rope will probably cut the PVC at the bend.
RE: Curvilinear Sanitary Sewer
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Curvilinear Sanitary Sewer
RE: Curvilinear Sanitary Sewer
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Curvilinear Sanitary Sewer
How deep is your sewer? I wouldn't think that the cost saving is worth it for you.
RE: Curvilinear Sanitary Sewer
Regarding the need for a curve or 'kink'in the horizontal alignment, the sewer will be installed across private property, in easement. The property owner has imposed restrictions regarding locations of these sewer segments and manholes.
The angle between the segments is approximately 150-degrees (i.e. 30-degree pipe bend/fitting).
The depth of the sewer varies between 12-feet at the upstream manhole and 22-feet deep at the downstream manhole.
Another possibility is to drill such that the curve is as tight (short radius) as possible and then excavate at this location, straighetn the pipe segments and install a manhole at the intersection of these straight segments. Due to the easement constraints, I have a limited area for this excavation (approx. 60-feet max.).
RE: Curvilinear Sanitary Sewer
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Curvilinear Sanitary Sewer
You may be limited by the radius of curvature.
You also have to contend with the entry angle. You will probably have considerable setback for the the drilling equipment because of the pipe depth.
Before you bid this project, you shoudl review the project with an experienced contractor.
RE: Curvilinear Sanitary Sewer
RE: Curvilinear Sanitary Sewer
Richard A. Cornelius, P.E.
WWW.amlinereast.com