Drill bit for construction of cast-in-situ bored pile
The invention discloses a drill bit for construction of a cast-in-situ bored pile. The drill bit comprises a hollow foundation rod, a connecting part positioned at the top end of the hollow foundationrod and used for being connected with a drill stem of a drilling machine, a retainer ring concentric...
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Main Authors | , , , , , , |
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Format | Patent |
Language | Chinese English |
Published |
28.09.2018
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Subjects | |
Online Access | Get full text |
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Summary: | The invention discloses a drill bit for construction of a cast-in-situ bored pile. The drill bit comprises a hollow foundation rod, a connecting part positioned at the top end of the hollow foundationrod and used for being connected with a drill stem of a drilling machine, a retainer ring concentric with the hollow foundation rod, a plurality of connecting plates used for being connected with theretainer ring and a plurality of first scraper plates used for being connected with the retainer ring and provided with cutting teeth. A concentric guide drill sleeve is arranged outside the hollow foundation rod; the bottom end face of the guide drill sleeve is arranged to be a plane and the multiple cutting teeth are arranged on the bottom end face in the circumferential direction; the guide drill sleeve extends to the position below the bottom end face of the hollow foundation rod in the axial direction; a plurality of second scraper plates are arranged between the guide drill sleeve and the hollow foundation rod, |
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Bibliography: | Application Number: CN201810665621 |