Development of an ice core drill for liquid-filled holes
Simple tests simulating drilling in a liquid-filled hole were done of an S-type Archimedean core drill, consisting of a drive-unit, a jacket, a shaft with a screw booster and a sweeper, and a barrel. The barrel length was 0.9m. The tests revealed that the clearance between the jacket and the barrel...
| Main Authors: | , |
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| Format: | Report |
| Language: | English |
| Published: |
Institute of Low Temperature Science, Hokkaido University/Institute of Low Temperature Science, Hokkaido University
1986
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| Subjects: | |
| Online Access: | https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2080 http://id.nii.ac.jp/1291/00002080/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2080&item_no=1&attribute_id=18&file_no=1 |
| Summary: | Simple tests simulating drilling in a liquid-filled hole were done of an S-type Archimedean core drill, consisting of a drive-unit, a jacket, a shaft with a screw booster and a sweeper, and a barrel. The barrel length was 0.9m. The tests revealed that the clearance between the jacket and the barrel (which together made up an Archimedean pump) should be a little wider for drilling in a liquidfilled hole than in a dry hole. With the clearance of 7.4mm, the pump could transport ice chips to the storage space between the booster and the sweeper, where the booster compacted chips by squeezing a large portion of the liquid through the sweeper which was permeable to liquid. The porosity of compacted chips could be as low as 35%. |
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