Rod Pushing

Method 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 BoringA 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....

Rods

Either flexible poles, fiberglass or wood for example, for removing blockages in sewers; or graduated measuring devices for estimating internal sewer dimensions.

Roll

The angle of rotation about the theoretical longitudinal centerline of the MTBM, measured from the 12 o’clock position.

Roller Cone Bit or Reamer

A bit or reamer in which the teeth rotate on separate, internal shafts that are usually aligned perpendicular to line. Used for boring rock.

Roof Leader

A drain or pipe that conducts storm water from the roof of a structure downward and thence into a sever for removal from the property, or onto the ground for runoff or seepage disposal.