Question: How do you install Sondex pipe with inclinometer casing?
Answer: You will need Sondex pipe (corrugated plastic pipe used for drains), Sondex pipe couplings, Sondex sensing rings, Strong cable ties (16 inches or longer) or wire, mastic tape, and vinyl tape. The Sondex couplings are used to join lengths of Sondex pipe. The cable ties or wire are used to secure the Sondex pipe to the bottom of the casing and to hold the Sondex couplings onto the Sondex pipe. The mastic tape an vinyl tape are used to seal the bottom and each coupling so that grout cannot enter in the void between the Sondex pipe and the inclinometer casing. You should also consider installing a grout pipe (or hose) along with the casing and Sondex pipe, since it can be difficult to work a grout pipe between the Sondex pipe and the borehole wall.
Question: What is a Sondex coupling?
Answer: A Sondex coupling is a short section of drain pipe that is made to link two lengths of Sondex pipe together. The couplings are also corrugated pipe, but their corrugations are spaced so that they key into the Sondex pipe corrugations. They fit tightly and are easy to waterproof. Slope Indicator's part number is 50801601.
Question: Can I make couplings?
Answer: Yes, if you have no other choice. But first check if you can buy the couplings at local stores that sell drain pipe. They are commonly used by builders who have to install drain pipes.
If you must make couplings, cut some 8 to 12 inch lengths of Sondex pipe and slit them. To use, but the two lengths of Sondex pipe together, then fit the coupling onto the joint. Use cable ties to secure the coupling. Then use mastic and tape to waterproof the joint.