Horizontal Directional Drilling (HDD) is an above ground surface to surface trenchless method used to install pipelines and conduits in areas where conventional excavation methods are not feasible and/or desirable for environmental and/or constructability reasons. Bortech Company, Inc., has employed the HDD method under rivers, creeks and streams, highways, railroads, airports, ocean beaches and environmentally sensitive and delineated lands. 

The HDD process is performed by first drilling a smaller pilot hole that is directed by the drill operator who follows a pre-designed and approved bore path. The second step is to enlarge the completed pilot hole in a single or multiple successive passes to accommodate the product pipe or carrier pipe. The third step is to proof the enlarged hole to validate the integrity of the bore hole. The final step is the pulling in or installation of the desired product pipe or conduit. 

Bortech provides HDD services that range from;


  • Large or Maxi Directional Drills with capabilities of 5,000 feet in soft soils to hard rock formations. 

  • Small Directional Drills under 100,000 lbs of pulling capacity for intermediate capabilities in soft soils to hard rock formations. 


The Jack and Bore (J&B) method of Trenchless Technology is a one step installation of steel or reinforced concrete pipe. The J&B operation is set up and performed at the finished elevation. Typically requiring an OSHA specified excavated launching pit. The J&B machine is guided by a set of tracks that also allow for the machines thrust forces to be transferred from a reaction wall to the product pipe. As the pipe is advanced into the earth. The spoils are removed by various means depending on the type of pipe jacking method. Auger Boring (AB), Hand Tunneling, Tunnel Bore Machines (TBM) and Microtunneling are four of the typically used methods. Each of which have their application in the field. Bortech Company, Inc. offers all methods of J&B. Filed Conditions, Geotechnical Data, Tolerance Parameters, Length and Diameter and product pipe selection are all particulars that need to be considered when choosing the correct method of installation. For the past 30 years Bortech has provided sound and proven choices when selecting the best fit Trenchless Technology for their clients. Bortech performs installations of pipe sizes to 72" in diameter.


Bortech Company, Inc., builds Concentric Hammer System (CHS) specifically for hard rock that tested above the Unconfined Compressive Strength (UCS) of 25,000 psi which is the limits of a Small Boring Unit that are Auger Driven. Bortech also found this system proven in unconsolidated rock formations. The CHS power is delivered by a pneumatic hammer that is encased in the lead steel casing pipe. The cased hammer and all subsequent casings are advanced and rotated by a conventional Auger Bore Machine. New advancements in this overburden drilling system minimize the amount of air that escapes to the surrounding soils or formation. This prevents overdrilling and damage to nearby structures and/or utilities. The CHS can be launched from a typical Jack and Bore pit of 39' or 29' in length.  


The Guided Bore System (GBM) is operated from within the tracks of a Jack and Bore system. The J&B system is typically inside an excavated launching pit at the desired elevation of the pipe to be installed. The GBM adds an initial phase of a pilot hole to the Auger Bore System. The purpose of the pilot bore is for increased accuracy and distance Typically required in line and grade applications like gravity sewer lines. The accuracy of the pilot hole is realized from the guidance system consisting of a theodolite, LED target, camera and digital computer monitor. The pilot tubes can be steered as they are advanced to keep the bore on line and grade. The accuracy of the GBM system is 1/4" at 400'. The second and final phase is the installation of the steel casing pipe installed by the Auger Bore machine that follows the previously installed pilot tubes.


Small Boring Units (SBU) are powered by an Auger Boring machine. In competent rock up to 25,000 psi Unconfined Compressive Strength. The SBU offers one of the most time efficient and cost effective methods of boring steel casing pipe. The SBU method is launched from an OSHA specified excavated pit. The principal of cutting the rock is through the use of pressure loading the small diameter cutterheads. The cutter heads are affixed to the cutting head that create a circular ring pattern that fractures the rock as the head turns. Bortech Company, Inc., worked with Robins Manufacturing in 1988 on their original prototype. 


Microtunnel Bore Machines (MTBM) are used to install grade sensitive pipelines requiring precise line and grade tolerances as in sewer line installation. These machines perform well in soft formation and high water tables. These machines are launched and received in 16' diameter shafts.  MTBM are operated from a remotely controlled, guided, pipe-jacking operation that provides continuous support to the excavation face by applying mechanical or fluid pressure to balance the groundwater and earth pressure. The hydraulic jacking system provide the mechanics to advance the pipe into the bore hole. The spoils are transported out of the machine by a closed loop slurry system. The solids are then cleaned and the fluid are recycled. The MTBM has a rotating cutting head that excavate the ground as the machine advances from the jacking system. Stones and rock material are reduced in size by a crusher cone located in the excavation chamber located behind the cutting head. The  earth at the location of the cutting head is stabilized by pressurized fluid slurry mixing chamber located behind the cutting head. The MTBM is steered through the use of articulating hydraulic jacks. The MTBM has an in-line camera that relays the information to the operator and a target system for guidance control. 

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