Thrust Boring

A method of forming a pilot bore by driving a closed pipe or head from a thrust pit into the soil which is displaced. Some small diameter models have steering capability achieved by a slanted pilot-head face and electronic monitoring. Back reaming may be used to enlarge the pilot bore. Also loosely applied to various trenchless installations methods. See Rod PushingMethod of forming a pilot bore by driving a closed pipe head with rigid attachment from a launch pit into the soil which is displaced. Limited steering and monitoring capability may be provided, usually in conjunction with a locator. See Thrust Boring..

Thrust Jacking Method

Method in which a pipe is jacked through the ground without mechanical excavation of material from the front of the pipeline.

Thrust Package

The bottom section of a split boring machine containing the cylinders and thrust block.

Thrust Pit

See DriveDesignation of the pipe installed from a jacking shaft to a reception shaft. Pit.

Thrust Ring

A fabricated ring that is mounted on the face of the jacking frame. It is intended to transfer the jacking force from the jacking frame to the thrust-bearing area of the pipe section being jacked.