Reverse circulation air injection drilling

Reverse circulation air injection drilling is a method of hydraulic circulation drilling to produce boreholes of up to approx. 3.2m diameter. In most cases drilling with hammer grab is first carried out. The soil is conveyed using the mammoth pump principle. The flushing current flows in the annular space between borehole wall and drill rod to the bottom of the borehole, from where the flushing current rises inside the drill rod conveying the cuttings with it.

Examples for reverse circulation air injection drilling

  • The duty cycle crawler crane positions the unit for reverse circulation air injection drilling on the casing. There it is fixed with hydraulically activated clamps.

    Positioning the unit for reverse circulation air injection drilling

    The duty cycle crawler crane positions the unit for reverse circulation air injection drilling on the casing. There it is fixed with hydraulically activated clamps.

  • Single hollow drill rods are screwed together to form a complete drill string. Thus, the required depth can be reached.

    Drill rod

    Single hollow drill rods are screwed together to form a complete drill string. Thus, the required depth can be reached.

  • Using the drilling head the ground is loosened. This is a cylindrical body fitted with various teeth and bits at its lower end.

    Drilling head

    Using the drilling head the ground is loosened. This is a cylindrical body fitted with various teeth and bits at its lower end.

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