Trenchless construction

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

Rotary rod machine

Construction; Trenchless construction

A machine used to drill earth horizontally by means of a cutting head attached to a rotating rod (not an auger). Such drilling may include fluid injected to the cutting head through a hollow rod.

Drilling fluid

Construction; Trenchless construction

A mixture of water and usually bentonite and/or polymer continuously pumped to the cutting head to facilitate cutting, reduce required torque, facilitate the removal of cuttings, stabilise the ...

Drive shaft/entry shaft/drive pit

Construction; Trenchless construction

Excavation from which trenchless technology equipment is launched for the installation of a pipeline, conduit, or cable. May incorporate a thrust wall to spread reaction loads to the soil.

Earth piercing

Construction; Trenchless construction

The use of a tool which comprises a percussive hammer within a suitable casing, generally of torpedo shape. The hammer may be pneumatic or hydraulic. The term is usually associated with non-steered ...

Utility tunnelling

Construction; Trenchless construction

A 2-stage process in which a temporary ground support system is constructed to permit the installation of the product pipe. The temporary tunnel liner is installed as the tunnel is constructed. The ...

Closed-face

Construction; Trenchless construction

The ability of a tunnel boring machine to close or seal the facial opening of the machine to prevent or slow the entrance of soils into the machine. Also may be the bulkheading of a hand dug tunnel ...

Spoil

Construction; Trenchless construction

Earth, rock, and other materials displaced by a tunnel or casing, and removed as the tunnel or casing is installed. In some cases, it is used to mean only the material that has no further use.