Core section rod capable of preventing square head from falling for rotary drilling rod

Abstract

The invention discloses a core section rod capable of preventing a square head from falling for a rotary drilling rod. The core section rod comprises a core section rod pipe body, the square head fixedly connected to one end of the core section rod pipe body, a lifting lug fixedly connected to the other end of the core section rod pipe body, and an anti-falling device connected between the squarehead and the lifting lug, wherein the square head comprises a square head square, a square head disc and a square head neck, one end of the square head neck is fixedly connected with a mandrel throughwelding, the square head is fixedly connected with the core section rod pipe body via the mandrel through welding, the anti-falling device comprises a chain and a steel wire rope connected with the chain, a counter bore is formed in the middle of the square head neck end of the square head, one end of the counter bore extends to the square head square, a hinge pin hole penetrating through the counter bore in the radial direction is formed in the square head square, a hinge pin matched with the hinge pin hole is arranged in the hinge pin hole, one end of the chain is connected with the squarehead square part of the square head through the hinge pin, and the end, away from the chain, of the steel wire rope is connected with the lifting lug. According to the core section rod, the square head can be prevented from falling after the core section rod is broken, and the square head and a drill bit can be conveniently taken out of a drill hole.

Description

technical field [0001] The invention relates to the field of rotary drilling rods, in particular to a core segment rod for rotary drilling rods capable of preventing square heads from falling. Background technique [0002] Rotary drilling rig is a construction machine suitable for hole-forming operations in building foundation engineering. The rotary drilling rig is an important part of the rotary drilling rig, and the drilling rig is generally used with multiple sections nested together. The drill pipe with the largest radius is the first section of drill pipe, and the second largest radius is the second section of drill pipe. , and so on, when the drill pipe is drilled, the multi-section drill pipe is stretched out from the outside to the inside for drilling, and when the drill pipe is lifted, the order is reversed, and it is lifted from the inside to the outside. Among them, the core segment rod with the smallest radius is connected with a square head at the protruding e...

AI Technical Summary

Problems solved by technology

Among them, the core segment rod with the smallest radius is connected with a square head at the protruding end, and the rotary drilling bit is connected with the rotary drilling rod through the square head to carry out rotary digging work, and the core segment rod needs to withstand huge internal and external pressure, twisting and bending during the working process and vibration. During the use of the existing core section rod, the square head side and the square head plate of the square head are easy to break, and the tube body of the core section rod near the square head end will also break, and then the square head will fall, resulting in Vicious accident in the hole where the drill bit connected with the square head fell

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