Page 387 - Trenchless Technology Piping Installation and Inspection

Inspection and QA/QC for Trenchless Installation and Replacement Methods 337

Verify cutterhead does not protrude more than 3 in. beyond the leading edge of the
casing pipe, and that full-size auger section is used in the lead section of casing. As a
rule of thumb, for unstable soil, the cutterhead must be inside and for stable soil, the
cutterhead must be outside.

Verify sufficient lubrication fluid quantity is used if necessary, and a lubrication
system properly injects lubricant on the outside of the pipe.
Verify any unsuccessful boring 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 8.18 Sample checklist for inspection of horizontal auger boring operations.
(Continued)

FIGURE 8.19 Schematic view of pipe ramming. (Source: TT Technologies.)

FIGURE 8.20 Culvert installation under railroad using pipe ramming.
(Source: TT Technologies.)