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Photo Gallery For Miltilevel Angled Borehole System
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Dedicated Barcad system installed The multi level angled system slides over the flush threaded tremmie pipe as it is lowered into the angle borehole. Upon reaching the end point for installation of the multi level system, the tremmie pipe is then used to deliver annular materials for direct burial installations. |
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The BESST Multi Level Angled Borehole System (MLABS) was tested for direct burial by means of simulated borehole experiments. A 2-foot long borehole slanted at 25 degrees from horizontal was used for the test. The purpose of the test was to define installation procedures and to evaluate the hydration and hydraulic behavior of annular seal materials which were used to isolated various groundwater sampling zones. It was determined that a 1:1 dry weight mixture of granulated Benseal
(Baroid) and a #3 coarse sand provided successful means for installation
of the seals between monitoring zones. Success of the procedure was facilitated
by sand washing the tremmie pipe simultaneously with transporting the
seal mixture into the well bore. MPEGs are available upon request that
provide a motion study for transport and hydration.
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View of simulated well bore bottom. #3 sand is introduced into the zone
surrounding the bottom-most Barcad pump. The gray cylinder in the photo
represents a 94mm drill bit with a 94mm pass-through. As the annular materials
are introduced into the borehole, the well casing (white), drill bit (gray)
and tremmie pipe atre incrementally retracted to the ground surface. Clear
acrylic pipe is borehole. Granulated Benseal mixture is introduced into well bore through tremmie pipe. Note #3 sand grains are becoming encapsulated by hydrating bentonite. Printable Format (PDF):
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