One is drilling through loamy soil to put 50 feet of 4-inch water pipe under a busy roadway. This proliferation is driven by two things: soil conditions and bore dimensions. Part of the maturation of HDD is the proliferation of HDD machines and hardware. Entry and exit locations are restored to their original condition to complete the process. Drilling fluids lubricate the parts, cool the cutting head, remove drilling spoils and stabilize the bore. Pipe or other product is pulled through the resulting bore. When the string emerges at the predetermined exit point, a backreamer is pulled back through to enlarge the initial hole. This drill string consists of drill rods and a cutting head. Some method of tracking the string is used, either a stringline back to the surface or an employee with a locator walking over the bore path. A drill rig rotates a drill string and drives it through the subsurface. Existing underground infrastructure is located. How Does Horizontal Directional Drilling Work?Īt its heart, HDD is easy to understand.
Typical markets include water, sewer, electrical, fiber optic, and gas and oil. As costs have come down and equipment design has matured, HDD may be the preferred method of putting product in the ground regardless of environment because it is often more cost effective than open trenches. Horizontal directional drilling (HDD) was developed to solve the problem of installing underground products in areas with challenging conditions such as urban settings, river crossings, rail lines and busy highways.
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