Definition - What does Dry Boring mean?
Dry boring is auger boring that does not use drilling fluids to remove spoil. It uses a specialized auger system called a dry boring machine, which operates within a bore pit the length of one pipe segment plus the length of the machine. As the machine creates the bore, the auger bit pulls the pipe into the newly created bore.
The auger also spools the spoil from the bore as it turns, much like a drill bit removing wood or metal from a hole it's creating.
The spoil pile is usually removed from the bore pit during the process.
Trenchlesspedia explains Dry Boring
As the trailing edge of each section of pipe nears the dry bore hole, the leading edge of another section of pipe is coupled to it. The dry boring process then continues with the dry bore machine driving its auger into the hole and the auger returning the spoil to the bore pit.
The spoil can be removed from the bore by hand, by vacuum truck, or depending on the size of the job and other factors, allowed to remain in the bore pit