What You Need To Know About Pilot Boring

Pilot boring was a technique developed by Dr. Peter Uffman from Bohrtec in Germany for the purpose of installing trenchless sewer pipe connections for houses. This particular technology was further developed at a later stage for the installation of mainline “sanitary” sewer pipes on grade and line over 300′ which occurred from one manhole to the next manhole as a cheaper alternative to the costly tunnel-boring machines.

How Does Pilot Boring Work?

The pilot-tube micro tunneling or better known as pilot-tube “guided” auger boring is utilized for the installation of pipes that feature outside diameters that range from 4″ to 55″. This process is the trenchless technique for Image result for actual pilot-tube operation for excavationinstalling the smaller diameter pipes along with an alignment and grade accuracy which the water industry and gravity sewer demands.

These pipes are typically installed in 2 methods. These include the two-phase installation or three-phase installation that begins with the reception and launch pit on either ends of a proposed drive-length. When dealing with gravity sewer projects which necessitate precision installations that feature a grade and line accuracy of 1″ or even better, these pilot-tube “guided auger” boring systems are able to offer the exact accuracy required.

What Makes The Pilot Operation Better?

The actual pilot-tube operation in itself is what contributes to the accuracy of pilot boring systems. The construction of the Bohrtec’s pilot-tube rod cannot be compared to any other type across the globe as they have gone onto perfect this particular design in the last 20 years. In fact Bohrtec is the sole company that operates in the U.S. that makes use of independent outside and inside pilot-tube rods in the “double-wall” pilot-tube design. The exterior of these pilot-tube rods is in essence a type of steel-jacking pipe that features female and male threaded ends. This jacks in-place, and will never turn during a steering operation of these pilot tubes.

In the way of avoiding having to rotate the outside and inside of the pilot rods at the same time into the ground, allows the Bohrtec system to utilize much less torque while in operation. This means that there is no need to introduce in many cases messy gels, bentonite or lubricants in order to decrease friction. These additives are also known for decreasing additional heat that is created by the rotation of the outer-skin that often slows down the operation as well as reduces production.

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