Horizontal Directional Drilling and Planning

Today, Horizontal Directional Drilling is widely used. HDD allows for conduit placements underneath obstacles and provides maximum protection while, at the same time, minimizing maintenance costs. HDD is used in three major industries: the oil field, the utility industry, and the environmental remediation industry. Directional Technologies, Inc. specializes in the utility industry and the environmental remediation industry.

Trenchless Drilling

Trenchless construction includes such construction methods as tunneling, microtunneling (MTM), horizontal directional drilling (HDD) also known as directional boring, pipe ramming (PR), pipe jacking (PJ), moling, horizontal auger boring (HAB) and other methods for the installation of pipelines and cables below the ground with minimal excavation. Large diameter tunnels such as those constructed by a tunnel boring machine (TBM), and drilling and blasting techniques are larger versions of subsurface construction. The difference between trenchless and other subsurface construction techniques depends upon the size of the passage under construction.

The method requires considering soil characteristics and the loads applied to the surface. In cases where the soil is sandy, the water table is at shallow depth, or heavy loads like that of urban traffic are expected, the depth of excavation has to be such that the pressure of the load on the surface does not affect the bore, otherwise there is danger of surface caving in.

Pipe Bursting and Replacing

This method is commonly used in urban centers where the area immediately below the paved surface often is congested with existing services. Their presence allows little space for replacement of a defective service with a new line. The existing pipe/hole in the ground thus becomes valuable as a guide during replacement.

Pipe bursting, sometimes called pipe splitting, has been developed to take advantage of this resource. Replacement occurs by splitting the defective pipe and displacing the fragments to enable a new pipeline of the same diameter, usually of polyethylene, to be drawn in. Where increased capacity is desired, an expanding device, which may be either pneumatic or hydraulic, is introduced into the defective pipeline to shatter the pipe. Then the new line is pulled in. Up-sizing from 4 in. to as much as 9 in. diameter has been accomplished with this approach in gas mains, water mains and sewerage.

Infrastructure Development for Residential and Commercial Communities

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