Page 364 - Trenchless Technology Piping Installation and Inspection

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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 tunnel is back-filled immediately.
Verify each end of the pipe is enclosed, restorations are completed, and attach
Inspector’s Daily Report (IDR), form 2228.

Permit No. __________________________
Inspector: ___________________________
Date: _______________________________

FIGURE 8.2 Sample checklist for inspection of pipe jacking operations. (Continued)

FIGURE 8.3 Jacking shaft.

pieces of rock up to a maximum size of around one-third of the exter-
nal diameter of the cutterhead can be crushed to a particle size, which
can be conveyed through the discharge pipe. Figure 8.6 illustrates
common types of microtunneling cutterheads.

Quality Assurance/Quality Control
Quality assurance/quality control (QA/QC) is an important ele-
ment in the prequalification and selection of microtunneling con-
tractors, pipe selection, and using appropriate equipment that must
be addressed in the bid documents and project specifications. Good
quality control is also important in the inspection of the pipe, and is
necessary during the installation process. Difficult jobs require
contractors to demonstrate that they have sufficient work-related
experience (or have a joint-venture agreement with a MTBM manu-
facturer) by meeting prequalification requirements. The MTBM must