Development of an ice core drill for liquid-filled holes

• Main Authors: Suzuki,Yosio, Shimbori,Kunio
• Format: Report
• Language: English
• Published: Institute of Low Temperature Science, Hokkaido University/Institute of Low Temperature Science, Hokkaido University 1986
• Subjects: ice core; Memoirs of National Institute of Polar Research; Polar Research
• 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

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%.