Glossary

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Obstruction

Any object or feature that lies completely or partially within the cross-section of a microtunnel or drill that prevents continued forward progress.

Open Cut

Underground construction method involving excavation from ground level to the level required for the installation, maintenance or inspection of a pipe, conduit or cable. Upon completion of the work, the trench is backfilled and the surface restored.

Open Shield

A shield that allows direct access to the soil face.

Overcut

The annular space between the excavated hole and the outside diameter of the jacking pipe.