The housing also prevents settling of the ground above. The use of the casing helps to support the tunnel made by the cutting tool. What We've LearnedĬased boring is the most traditional method of auger boring used in trenchless excavation. The uncased boring project should be limited to temporary tunneling or small diameter holes, lessening the risk of injury due to unstable environments. Workers should never enter the tunnels created by the boring tool. For workers performing uncased boring projects, collapse is a possibility, as the holes created by the bore are unsupported. Services using cranes should also be aware of overhead utility lines. The cost of replacing damaged lines can be substantial. (Read The Science of Getting it Right: Locating Underground Utilities.) While schematics may be available for underground lines, workers should verify line placement before beginning. Additionally, employees should remain out of the exit pit during the boring operation. Compromised slope integrity is dangerous to both workers and equipment. (Read Getting Technical: Information Required in a Geotechnical Investigation Report.)įor both cased and uncased boring projects, the launch pit can pose risks.
#JACK BORE VS DIRECTIONAL DRILLING HOW TO#
The geotechnical engineer will then produce a report with information pertinent to how to proceed with the project with a focus on maximum profit, minimum risk and appropriate spend time. (Also see " 4 Essential Considerations for Designing a Borehole.") Are There Safety Considerations to Consider with Auger Boring?Īs with any project, being observant is the primary safety resource in performing either cased or uncased boring projects.Ī geotechnical investigation of the area alerts workers to any potential hazards they may face when using cutting tools. The tunnel could collapse in if not properly secured.
Workers using uncased methods must use caution when performing these jobs. However, due to the potentially unstable nature, they are seldom used. Workers may bore larger holes if necessary, especially if the hole is meant to be a temporary solution.Īs with cased boring, uncased jobs usually are for utilities. More often, the holes required for this method are smaller than eight inches in diameter. There are few opportunities to use uncased boring.
The cutting tool moves along the same type of track and similarly removes the spoil. However, instead of having a casing pushed into the hold made by the auger, there is nothing to support the hole and keep it from collapsing. Uncased boring is similar to the cased method.
However, because it is a track system, there are more moving parts to consider. No cranes are necessary to move these pieces into place. The casing and auger assembly takes place in the launch pit. More commonly used than the cradle system, the track system does not require as large of an assembly area.
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