Dogs

Moveable protrusions in the thrust block that engage holes or blocks in the track.

Double Ring Brick Sewer

A brick sewer which consists of two layers of bricks.

Downtime

Time lost when the MTBM is unable to operate; generally associated with equipment failure.

Drainage Fixture Unit

A drainage fixture unit, often referred to as a fixture unit or FU, is a unit of measure of the waste water flow generated by an appliance, such as a sink or toilet. For example, the typical full bath has a value of 9 FUs. See availability fee for cost.

Drill Bit

A tool which cuts the ground at the head of a Drill String1) The total length of drill rods/pipe, bit, swivel joint etc. in a drill bore-hole. 2) System of rods used with cutting bit or compaction bit attached to the drive chuck., usually by mechanical means but may include Fluid Jet Cutting.