Ditch Witch OnGrade - Manual (Page 51)

Complete the Job - 50
OnGrade Operator’s Manual
Inspect Installation
CMW
Inspect Installation
After the product pipe is pulled back, clean out the pipe and inspect the installation.
1. Use surveying rod and laser receiver to take distance measurement from laser plane to top of installed
pipe at start and end pits. Ensure laser is set up exactly as it was during the bore.
2. Tie a small rope to the correct size of foam cleanout pig. Ensure the rope is longer than the installed
pipe and spool off enough rope at the pipe entrance to allow pig to pass easily through the pipe.
3. Place the pig in the pipe and use a vacuum excavator at the other end of the installed pipe to pull pig
through the pipe. If the pipe still has fluid or spoils in it, make a second pass with the pig.
4. Pour a known quantity of water in the uphill end of the installed pipe. Place a bucket at the lower end to
catch the water that comes out.
5. Install grade beacon used for the bore into the grade trolley. See “Beacon Trolley” on page 45.
6. Attach the rope to the connector on the front of the trolley.
7. If a video camera will be used, connect camera. See “Camera/Video Recorder” on page 46.
8. Begin pulling trolley through installed pipe.
9. Take pitch readings at spots where depth readings were taken during pilot bore. If this is not possible,
take readings at consistent distance increments (5-10’/1.5-3 m).
10. Once trolley reaches other end of installed pipe, disconnect it from the rope. Stop the video recorder, if
used.
11. Pull trolley back through the installed pipe by reeling in the cable.
12. Transfer video and pitch information to computer.
IMPORTANT:
• If installed pipe has a flat grade or long run, this process could take several minutes.
• If installed pipe has a low spot, add more water until water comes out the downhill end.
NOTICE:
• Stop trolley for 3-4 seconds before taking pitch readings to allow beacon pitch sensor to settle.
• Use radios to allow tracker operator to communicate with the person pulling the trolley.