At GELDNER UNDERGROUND, we believe that your project should be kept as simple and straightforward as possible, regardless how complex the task may seem. We try to avoid subcontractors and outsourcing wherever possible.
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Directional boring is used when trenching or excavating is not practical. It is suitable for a variety of soil conditions and jobs including road, landscape and river crossings. Installation lengths up to 6,500’ (2,000m) have been completed, and diameters up to 56" (1,200mm) have been installed in shorter runs.
The equipment used in a directional drill operation depends on the size of the pipe, length of the run, and surrounding locations. For the large bores, a 100,000-pound pulling power drill is used with a reclaimer, excavator, and multiple pumps and hoses to move the fluid. The drilling steel is a 3-in. diameter pipe with male and female threads. The head of the operation comes in multiple designs and depends on the rock or soil being penetrated. The drilling head has multiple water ports to allow removal of material.
The process starts with receiving hole and entrance pits. These pits will allow the drilling fluid to be collected and reclaimed to reduce costs and prevent waste. The first stage drills a pilot hole on the designed path, and the second stage enlarges the hole by passing a larger cutting tool known as the back reamer. The reamer's diameter depends on the size of the pipe. The driller increases the diameter according to the material being cut and to achieve optimal production. The third stage places the product or casing pipe in the enlarged hole by way of the drill steel; it is pulled behind the reamer to allow centering of the pipe in the newly reamed path.
Horizontal directional drilling is done with the help of a viscous fluid known as drilling fluid. It is a mixture of water and, usually, bentonite or polymer continuously pumped to the cutting head or drill bit to facilitate the removal of cuttings, stabilize the bore hole, cool the cutting head, and lubricate the passage of the product pipe. The drilling fluid is sent into a machine called a reclaimer which removes the drill cuttings and maintains the proper viscosity of the fluid.