Spirally bottom-expanding integrated drill bit

Abstract

The invention discloses a spirally bottom-expanding integrated drill bit. The drill bit comprises a drill stem, a left bottom-expanding arm and a right bottom-expanding arm, wherein the bottom of the drill stem is fixedly connected with an outer sleeve; an inner sleeve is glidingly arranged in the outer sleeve in a matching way; an arm-protecting plate is fixedly arranged outside the outer sleeve; a soil-accommodating disc is fixedly arranged at the bottom end of the inner sleeve; the upper ends of the left bottom-expanding arm and the right bottom-expanding arm are respectively hinged to the two sides of the arm-protecting plate; and the lower ends of the left bottom-expanding arm and the right bottom-expanding arm are respectively hinged to the soil-accommodating disc through connecting rods. The drill bit is simple and reliable in structure and convenient to operate. During bottom-expanding operation, soil is collected through the soil-accommodating disc, and when the drill bit is lifted out of a pile, the soil can be taken out together, so that the time and the labor are saved, and the operation efficiency of the drill bit is greatly improved. In addition, the vertical compression-resistant performance of the pile can be improved, and the drill bit has a wider popularization and application space in the field of buildings.

Description

technical field [0001] The invention relates to the field of bottom expansion drill bits, in particular to a spiral bottom expansion integrated drill bit. Background technique [0002] The bottom expansion drill bit is a drill bit for constructing bottom expansion piles in rotary drilling. Generally, it is composed of expanded bottom wing, pressurized frame, connecting rod, base and pin shaft. The expansion wing has two wings, three wings or four wings. When the drilling rig rotates, the expansion wing is gradually opened under the action of the drilling tool's own weight, and the bottom expansion is carried out by cutting the hole wall. [0003] However, most of the existing reaming drill bits are complex in structure, heavy and expensive. During the bottom expansion operation, a deep hole will be formed below the ground surface, also called a pile, and the soil formed by bottom expansion will accumulate in the pile, and the drill bit needs to be lifted out, and then ...

AI Technical Summary

Problems solved by technology

[0003] However, most of the existing reaming drill bits are complex in structure, heavy and expensive

During the bottom expansion operation, a deep hole will be formed below the ground surface, also called a pile, and the soil formed by bottom expansion will accumulate in the pile, and the drill bit needs to be lifted out, and then the soil in the pile will be collected by manual or mechanical equipment to the surface, which affects the operating efficiency of the drill bit

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