Drill bit for construction of cast-in-situ bored pile

• Main Authors: CHEN BAOCAI, FU LIANHONG, XU BIN, ZHOU YUEYANG, XU XINZHAN, LUO PING, MA HONGFU
• Format: Patent
• Language: Chinese; English
• Published: 28.09.2018
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

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,