Horizontal Auger Boring (HAB)

Published: | Updated: August 28, 2019

Definition - What does Horizontal Auger Boring (HAB) mean?

Horizontal auger boring is a method of trenchless excavation that uses a rotating helical shaft to extract soil while advancing along a more or less level line. The spiral edges of the auger, something akin to a large screw, remove the spoil let behind as the operation progresses. Once the boring reaches its endpoint, the auger is removed, leaving only the casing.

Auger boring is used in applications such as oil, gas, water and sewer pipes.

Trenchlesspedia explains Horizontal Auger Boring (HAB)

There are many ways to make a hole. Horizontal auger boring takes advantage of a helix-shaped device reminiscent of Archimedes’s screw. The design attributed to him was used to raise water by turning the corkscrew-like machine using a hand crank.

Encasing an auger ensures that whatever is encountered by the cutting head has nowhere else to go but up or out. A machine placed securely into the entrance pit of a drilling operation uses both torque and thrust to move the auger with its casing forward along a horizontal path. The pipe casing is laid in sections, one after another, as forward sections progress through the hole. With horizontal auger boring, the making of the hole and the installation of the pipe are accomplished simultaneously.

Auger boring is best suited for softer ground conditions. An auger boring machine jacks the casing into the ground while the auger turns. Horizontal auger boring is a trusted method in the trenchless construction industry.

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