Page 391 - Trenchless Technology Piping Installation and Inspection

Inspection and QA/QC for Trenchless Installation and Replacement Methods 341

Verify hammer frame is used to distribute ramming forces around the pipe
circumference, a launch seal is used at face of ramming operation, and a casing band
is applied to the leading edge of pipe in open-end ramming operations, or a cone-
shaped pipe head is attached to closed-end ramming operations.
Verify sufficient lubrication fluid quantity is used, and a lubrication system properly
injects lubricant on the inside and outside of the pipe.
Verify any unsuccessful rammed hole is back-filled immediately.
Verify each end of casing is bulkheaded, restoration is completed, and attach
Inspector’s Daily Report (IDR), form 2228.

Permit No. __________________________
Inspector: ___________________________
Date: _______________________________

FIGURE 8.21 Sample checklist for inspection of pipe ramming operations.
(Continued)

Product line

Swivel

Reamer
FIGURE 8.22 HDD method.

5. The drilling fluid delivery and recovery system made up of
tanks, mixing systems, pumps; and, when recycling fluids, a
system of screens, filters, shakers, cones, and the like to remove
spoils brought to the surface from the fluid.

QA/QC Procedures
HDD QA/QC measures are provided in the installation contract, and
by state and local regulations governing underground construction.
In addition, industry guidelines such as references listed at the end of
this book are helpful. Below is an overview of QA/QC requirements:
1. Preconstruction: Prior to construction, geological conditions
need to be assessed to determine equipment and material
needs. HDD operator must walk the site to identify potential
hazards, sources of interference, and special conditions. The
boreplan must be prepared with adequate setup area and
separation from utilities.