CommScope Trunk & Distribution Cable - Manual (Page 48)

Boring and Conduit Installations
Conventional Bores
Mechanical boring machines may be utilized to push a drill stem to make an adequate cable passage.
Pneumatically driven pistons may be used as well. Conduit should be placed to support the tunnel wall and allow
cable placement.
Directional Bores
Directional boring is accomplished by using a steerable drill stem. The depth and direction of the boring can be
controlled by the equipment operator. Very long bore lengths can be accomplished by using directional boring
devices.
Subsurface crossings are generally accomplished by digging a trench on each side of the crossing to allow the
guiding and retrieval of the drill stem. Detailed equipment operation and excavation procedures are specified by
the construction equipment manufacturer.
Generally, try to keep the bore as straight as possible. The hole may be enlarged by using reamers. Conduit
should be installed at strategic locations (i.e. street crossings).
After the bore is complete, attach the cable to the drill stem with the appropriate cable grip and swivel. Pull the
drill stem/cable through the bore. Longer pulls will require tension monitoring.
5.7 Underground Installation
Boring and Ductwork