Page 365 - Trenchless Technology Piping Installation and Inspection

Inspection and QA/QC for Trenchless Installation and Replacement Methods 315

FIGURE 8.4 Front and back of a microtunneling machine.

be compatible with expected ground conditions. Contract specifica-
tions must address (possibly through submittal requirements),
methods for slurry disposal, lubrication, intermediate jacking sta-
tions, shaft construction and MTBM entry and exit seals, installation
monitoring, possible dewatering, and ground restoration, among
other subjects.

Preinstallation/Construction Planning
Prior to construction, underground utilities must be located and visu-
ally confirmed. A preconstruction survey must be made of the area to
establish a damage and settlement baseline. A plan for addressing
traffic control, handling and disposal of spoils, shaft construction and
safety must be developed prior to beginning construction. Proper
shaft construction is a key quality control issue. Groundwater and
soil entry into the shaft must be controlled and minimized, especially