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Horizontal directional drilling (HDD) technology

Horizontal directional drilling technology is used for laying communications (pipelines, gas pipelines, sewers, etc.).

The use of the HDD method allows you to lay a pipe without opening the soil surface. It’s fast, convenient and not expensive. After all, if you lay communications using the trench method, you have to dig a trench, and then backfill it and restore the landscape (lawn, tiles, asphalt) after the work.

Soil puncture technology has become widely used in the case of laying communications under roads and railways, under rivers, lakes and in dense urban or suburban buildings.

The use of the HDD method under roads makes it possible to lay pipelines under them without stopping traffic during the work.

Horizontal directional drilling (HDD) technology

The essence of the HDD method is that the drilling rig begins horizontal drilling from point “A” to point “B” using a drill attached to the end of the drill rod. In this case, the drill rods are built up as the drill passes inside the soil.

To ensure that the drill in the ground moves in the right direction and does not touch other communications, it is monitored using a location system.

Ultimately, the drill comes to the surface of the earth at point “B”.
At this point, the drill is removed and a flexible polyethylene (HDPE) pipe is attached to the drill string, which must be pulled. The pipe is called a “case”.

The diameter of the hole drilled by the drill is much smaller than the diameter of the drill pipe. In order to increase the diameter of the well, an expander is first connected to the rod and a pass is made with the expander in the opposite direction. This is done several times until the diameter of the well is sufficient to tighten the case.

During the last pass, a case is attached behind the expander. The machine begins the reverse movement of the drill string from point “B” to point “A”, pulling the pipe inside. The drill string is reduced as it moves back.
Ultimately, the expander and the end of the pipe end up at the very beginning of the path, at point “A”.

Thus, when moving from “A” to “B”, a well is drilled, and when moving back from “B” to “A”,

The necessary communications are laid in the padded case – cables, water supply, sewerage, gas.

Large drilling rigs work from the surface of the earth, but small ones require digging a pit or lowering them into an existing well.

Large HDD installations are used for pulling long-length communications, as well as for passing under rivers and lakes where the depth of the underground obstacle is significant. Large installations are expensive and expensive to maintain. Therefore, their use is cost-effective for large facilities.

Compact mini HDD installations are used for small punctures under roads or for working in cramped conditions. Where a large installation cannot be placed on the surface.

The horizontal directional drilling market is gradually growing. Best of all, with Mini Installation you will become a fully-fledged contractor capable of carrying out communications laying work in your area. At the same time, the cost of purchasing equipment is comparable to starting a small business.

Go to the home page of our website, we offer a full range of horizontal directional drilling rigs from 15 tons to 140 tons, and can also be customized with various functions you need.

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