2004 0930 Ca
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The document summarizes a pipe bursting job replacing a broken and clogged 6-inch sewer line that was 90 feet long. The entry and exit pits were washed out due to collapsed and root-infested existing pipe. Safety equipment and procedures were used during the job to comply with regulations while replacing the pipe, including pumping water from the pits, using shoring to support the pull, and safely extracting the last few feet of new pipe. The 100-foot length of new polyethylene pipe was able to curve to accommodate surrounding buildings due to the material's flexibility.
2004 0930 Ca
- 1. TRIC Training Log: 09-30-04 Client: West Point Solutions, San Mateo, CA Job: Apartment Complex, replace broken and clogged line Pull: 90’ / downstream / 6” SDR17 / bursting 6” AC
- 2. We at TRIC Tools have specific requirements for the use and maintenance of our equipment with regard to safety and efficiency on the job. Our written and verbal recommendations coincide with safety regulations set by local, state, and national government agencies. Our clients may have standards over and above industry regulations. However, the safety equipment, apparel, and operating procedures demonstrated by our clients in this presentation may or may not comply with above mentioned government regulations.
- 3. Entry pit: Washed out and backed up due to collapsed or root infested pipe downstream. Sewer passes under and alongside utility room foundation at this point.
- 4. Exit (pulling) pit: Also washed out (landfill at bay’s edge), requiring constant sump pumping.
- 5. Backup release: Worker drills pilot hole in sewer at upstream (entry) pit to release backflow from blockage downstream between pits. Note gas and irrigation lines.
- 6. Diversion: Removing backflow from work area.
- 7. Entry prepared: Excess water is pumped out and concrete pipe section removed. Note coupling (and plug) on upstream section where new pipe will be connected.
- 8. Entry: A “saddle” is cut out at edge of pit. Just a few shovel strokes can ease entry angle immensely.
- 9. The wonders of PE pipe: 100’ section of pipe curves to accommodate the surrounding buildings.
- 10. Easy turn: Impossible with any other type of pipe, with PE this entry is relatively simple.
- 11. Shoring: In this case, 10-foot sections of 2” galvanized pipe are used to support pull. Area behind resistance plate is completely collapsed, yet upper wall is intact and useful.
- 12. Cable view: Sump pump is in continuous use to keep pulley and cable visible. Ram can operate completely immersed; however, operator needs to see when clevis appears at threshold of pulley base.
- 13. Best Vantage Point: Out of the hole and with a view of pulley from above. (In this case, there was plenty of open area to watch for the clevis and bursting head in the wash-out behind the resistance plate and steel poles.)
- 14. Safe Landing: Extender cage was used against galvanized pipe shoring to extract last couple of feet.
- 15. Bumping: In most cases involving 4” and 6” pipe, a 12 to 16 pound sledge hammer will move the pipe along nicely after the cable and bursting head are removed.
- 16. PE pipe “memory”: At entry pit, pipe will hold the curve resulting from flexed entry. Note pin bar used to hold pipe down while cleanup is underway.