Concrete sewer pipe penetrations
Concrete sewer pipe penetrations
(OP)
We are planning to add two new 12" SCH 40, CS laterals to an existing 24" RCP. Is there a limitation on the hole size that can be bored in a 24" pipe?
The laterals are dischrge lines from two new oily water separators. We don't have adquate spacing for a box and manhole at the tie-in points because of other underground lines in the area.
We plan to bore the 13.75" holes at 45 degrees and grout them in. Then build a form and pour concrete around the laterals for strength.
Any other suggestions? Thanks.
The laterals are dischrge lines from two new oily water separators. We don't have adquate spacing for a box and manhole at the tie-in points because of other underground lines in the area.
We plan to bore the 13.75" holes at 45 degrees and grout them in. Then build a form and pour concrete around the laterals for strength.
Any other suggestions? Thanks.





RE: Concrete sewer pipe penetrations
let us know how you make out...
BobPE
RE: Concrete sewer pipe penetrations
RE: Concrete sewer pipe penetrations
Generally you would expose the pipe at the pentration and mark and line drill the penetration, making it somewat larger than the new pipe. Set the new pipe in, leaving space all around the between the old pipe and new pipe.
Chink and mortar the joint (not grout, as grouting will blow though into the old pipe). Once the mortar has set, dig below the old pipe, from the sides and top and pour a 4-6" thick collar around the joint. One important point, make sure upstream of both pipes is plugged before starting.
Again unless it is temporary such as to cut in a line,however, if you can avoid it, I would go with the manhole. It is not that significant a cost savings up front and if you have a problem, it could be very expensive.
RE: Concrete sewer pipe penetrations
BH