14 Terms
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Trenchless construction
Underground construction that involves little or no surface trenches so it has minimal disruption to traffic, business, and other activities. Trenchless technology is a fast growing sector of construction and civil engineering that covers such methods as boring, drilling, tunneling, and pipe ramming.
Industry: Construction
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Trenchless construction
Fluid-assisted boring
Construction; Trenchless construction
A type of Directional Drilling or Guided Boring technique using a combination of mechanical drilling and pressurised fluid jets to provide the soil cutting action.
Bentonite
Construction; Trenchless construction
A colloidal clay sold under various trade names that forms a slick slurry or gel when water is added. Also known as drillers mud. See Drilling Fluid.
Wrapped casing
Construction; Trenchless construction
A coating on pipe for protection from corrosion, usually composed of asphalt and asphalt coated paper. Some coatings may contain plastic, fiberglass, coal tar, or other materials.
Cutterhead or cutting head
Construction; Trenchless construction
The actual teeth and supporting structure that is attached to the front of the lead auger, drill stem or front face of the tunnel boring machine. It is used to reduce the material that is being ...
Jacking shield
Construction; Trenchless construction
A fabricated steel cylinder from within which the excavation is carried out either by hand or machine. Incorporated within the shield are facilities to allow it to be adjusted to control line and ...
Back reamer
Construction; Trenchless construction
A Cutting Head attached to the leading end of a Drill String to enlarge the Pilot Bore during a Pull-Back operation to enable the Carrier or Sleeve or Casing to be installed.
Conduit
Construction; Trenchless construction
A broad term that can include pipe, casing, tunnels, ducts, or channels. The term is so broad that it should not be used as a technical term in boring or tunneling.
