Page 406 - Trenchless Technology Piping Installation and Inspection

356 Cha pte r Ei g h t

Inspection Guide for Pipe-Replacement Systems (PRS)
Preinspection Plan Review

Review geotechnical and soil reports.
Ensure DOT / agency facilities and nearby utility information are shown on the
plans and profiles and that the proposed alignment does not interfere with them.

Verify site surveys before and after installation.
Note the minimum cover above the top of the existing pipe and below the pavement
surface, or ground elevation (for longitudinal installations outside the influence of the
roadway) is _____ ft.

Note new and host (existing) pipe characteristics:
Host pipe material ________________.
Host pipe diameter ___________in.
New pipe material _____________.
New pipe diameter _________ in.
New pipe dimension ratio ________.
Allowable pulling force ________ ton.

Review contingency plans.
Review job-site layout including: distance from access pits to roadbed, proposed
sheeting and bracing, materials storage and fabrication area, safety devices (barrels,
guardrail, etc.), and dewatering pit locations.
Verify all laterals are excavated and disconnected.
Verify bypassing plans are adequate.

Note unique or special items / circumstances: ___________________
Construction Inspection

Verify traffic control is consistent with the permit requirements, one call service
has been contacted, and the DOT / agency permit is on-site.
Verify job-site layout is consistent with the approved plans, especially the alignment
of the pipe and machine.
Verify pit excavation and bypassing efforts are according to plans and satisfactory,
and workers understand the contingency plan.
Verify new pipe characteristics are consistent with permit requirements.
Verify any upsizing is in accordance with permit.

FIGURE 8.25 Sample checklist for inspection of pipe-replacement operations.