horizontal directional drilling , HDD (Abkürzung)
directional boring

In 1988, Michels began a new method known as horizontal directional drilling to construct underground utilities.

Horizontal directional drilling is done with the help of a viscous fluid known as drilling fluid.

As an alternative to trenching, loops may be laid by mini horizontal directional drilling (mini-HDD).

The equipment used in a horizontal directional drilling depends on the outer diameter of the pipe, length of the run, ground conditions and the surroundings above ground.

Tunnels of less than a metre or so in diameter are typically done using trenchless construction methods or horizontal directional drilling rather than TBMs.

Prime Drilling GmbH (Horizontal Directional Drilling)

Michels Directional Crossings (Horizontal Directional Drilling)

Michels Directional Crossings is a division specializing in land and marine horizontal directional drilling (HDD).

In 1991 Vermeer Corporation launched its Navigator horizontal directional drilling machine line-up which has been used in installing fiber optics communications cables.

Pagan Rosa also added that the use of a Horizontal Directional Drilling will allow the construction of the pipeline "60 feet below the bottom of rivers."

Most accurate drilling guidance by dead-reckoning using high precision optical gyroscopes, Proceedings NoDig Conference of Horizontal Directional Drilling, Brisbane 2006.

The Drilling Products Group serves several markets including: environmental drilling, foundation drilling, geothermal drilling, horizontal directional drilling, slurry walls, water well drilling, and water well rehabilitation.

No-dig technology, which includes microtunneling (for boring holes up to 36 inches in diameter) and horizontal directional drilling (for holes around 15 inches or less), was developed 20 years ago to install utility lines under densely populated cities.

The company is a source for trenchers, vibratory plows, backhoes, electronic guidance and locating tools, horizontal directional drilling systems, drill pipe, downhole tools, chain, teeth and sprockets, vacuum excavators, excavator-tool carriers, and compact utility machines.

The company performs a wide variety of services encompassing almost all of Michels' divisions, including: Cured-in-place pipe, horizontal directional drilling, pipeline construction, tunneling construction, electrical, telecommunications construction, vertical drilling, wind farm construction and pipe rehabilitation.

From 2004 through 2006 has worked as the Head of Financial and Economic Department, General Director Deputy and Project Manager for "DrillTech Rus" Moscow, specializing in construction of pipelines using horizontal directional drilling technology.

Directional boring, commonly called horizontal directional drilling or HDD, is a steerable trenchless method of installing underground pipes, conduits and cables in a shallow arc along a prescribed bore path by using a surface-launched drilling rig, with minimal impact on the surrounding area.

The Directional Boring Advantage describes techniques used, with diagrams.

The company's divisions include Manufacturing, Panel, Electrical, Service & Supply, and Trucking & Directional Boring.