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BORE HEAD FOR MICROBORE OPERATION

  • US 20080099248A1
  • Filed: 12/20/2007
  • Published: 05/01/2008
  • Est. Priority Date: 07/18/2003
  • Status: Active Grant
First Claim
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1. A boring apparatus for drilling laser guided microbore tunnels using a liquid stream to remove soil, and an airstream to remove the soil and liquid mix having a bore head, comprising, a substantially cylindrical body with a leading end wall and a trailing end wall, an axial wall dividing the body into a component compartment and a flow compartment, a passage through the flow compartment for liquid and soil mix, a passage through the flow compartment for air, the component compartment housing a steerable boring shaft which projects through the leading end wall to support a cutter, a shaft bearing fixed to the axial wall near the trailing end, a liquid path through at least part of the shaft which exits beyond the leading end wall, a laser target mounted on the shaft close to the leading end wall and the cutter and a camera mounted on the axial wall for shooting the target, the shaft being steered by rams mounted on the axial wall and acting at 90°

  • to each other, up and down steering being provided by a first ram acting substantially parallel to the shaft and side to side steering being provided by a second ram acting transversely to the shaft.

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