UNITRACC - Underground Infrastructure Training and Competence Center

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May 18, 2020

NA-21 Utility Tunnelling: Pipe Jacking - Part 1

Definition overcut

Overcut:
The annular gap around the pipe deliberately created by using a cutting head or shield of a greater dimension than the outside dimension of the pipe [ [DINEN12889:2000]].

Overcut:
Half of the difference resulting from borehole diameter and outer pipe diameter (ideally an even annular gap around the pipeline).

(Image: Annular space fluid supported)