Page 377 - Trenchless Technology Piping Installation and Inspection

Inspection and QA/QC for Trenchless Installation and Replacement Methods 327

FIGURE 8.15 Pilot tubes. (Source: Akkerman, 2008.)

6. Soil removal: Suitable system must be provided to remove soil
from the shafts to the surface.
7. Hydraulic power unit: The hydraulic power unit shall rest on
the surface and be connected to the jacking frame by hoses.
The unit shall meet all applicable noise standards.
8. Lubricating system: A good lubricating system is important so
that the pipes can be transported from the drive shaft to the
receiving shaft under safe load conditions.
9. Monitoring system: Monitoring system must be capable of con-
tinuously monitoring the jacking pressure, advancement of
boring head and deviation of the PTMT machine. It is very
important for a contractor to understand the PTMT opera-
tion, and functions of all the above components, to have max-
imum productivity and accurate installation.

Surface Survey
It is important to conduct a surface investigation of the PTMT site
before the project begins to locate all the important structures that
may affect the installation. The survey is typically done along the
center line of the pipeline. Following are some of the important things
to be considered while conducting a surface survey:
• The work area requirements at the pit locations
• Grade along the centerline
• Location of roads and other important structure along the
centerline
• Locating the test pits
• Locating other waterways and wetlands along the centerline