Diameter-variable drill bit of long-spiral drill

Abstract

Provided is a diameter-variable drill bit of a long-spiral drill. A lip-shaped locating ring which has the role of axial locating and is connected with a hollow runner of the long-spiral drill is arranged at the top of the drill bit. A long-spiral drill pipe is connected with screws through fixing lugs on both sides of the lip-shaped locating ring. The part above the middle of a drill core is a diameter-variable cutting section drill core, and the screw blade of the part becomes gradually bigger in the upward direction. The part below the middle of the drill core is a guiding section drill core, wherein the blade diameter is unchanged. The drill core is provided with the screw blade, the front end of the screw blade is provided with cutting edges, the screw blade of the cutting section is provided with cutting teeth, a drill bit point is arranged at the bottom of the drill bit, the drill bit point is provided with a main cutting tool, and the top of the main cutting tool is connected with the drill core through the fixing lugs on both sides of the lip-shaped locating ring and retaining screws. The diameter-variable drill bit of the long-spiral drill is especially suitable for the construction of lock-joint pile waterproof curtains with pre-guide holes and the construction of other long-spiral piles with pre-guide holes, and effectively solves the problems that the pile-body perpendicularity deviation and the pile position deviation are large in the long-spiral construction.

Description

technical field [0001] The invention relates to a novel variable-diameter drill bit for a long screw drilling rig, which is mainly used for the construction of long screw piles and their occlusal pile walls in the field of civil engineering. Background technique [0002] Compared with the underground diaphragm wall technology, the interlocking pile wall waterproof curtain has the characteristics of better economy and better stratum adaptability in foundation pit engineering. It is widely used in engineering, but there are pile position deviation, pile verticality and occlusal ability. limits. The construction of occlusal piles has high requirements for pile-forming machinery. Usually, the secondary piles use large-scale pile foundation construction equipment such as full-rotary drilling rigs and rotary excavation pile foundations with outer sleeves. The high requirements for construction equipment also limit the Application of occlusal pile walls. Compared with the constru...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of verticality of pile body and pile position control, the present invention provides a variable-diameter drill bit for long auger drilling rigs that can effectively improve the verticality of the pile body of long helical stirring piles after the pilot hole and solve the problem of pile position deviation

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