Page 380 - 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 and the volume or pressure of
slurry flow in the supply and return side of the slurry loop is equal and steady.
Verify any unsuccessful tunnel is back-filled immediately.
Verify each end of the pipe is enclosed, restoration is completed, and attach
Inspector’s Daily Report (IDR), form 2228.
Permit No. __________________________
Inspector: ___________________________
Date: _______________________________

FIGURE 8.16 Sample checklist for inspection of pilot-tube microtunneling
operations. (Continued)

8.4 Horizontal Auger Boring

8.4.1 Introduction
The horizontal auger-boring (HAB) method involves the forming of a
bore from a drive pit, by means of a rotating cutting head, and install-
ing a steel pipe that serves as a casing for carriers (sewer, water, cable,
and so on). It is a multistage process consisting of constructing a tem-
porary horizontal jacking platform and a starting alignment track in
a drive pit at a desired elevation (see Fig. 8.17). The casing pipe is

FIGURE 8.17 Horizontal auger-boring method. (Source: Midwest Mole.)