Special device and method for fishing drill bit of rotary drilling rig in case of drilling blocking

Abstract

The invention relates to a special device and a method for fishing a drill bit of a rotary drilling rig in case of drilling blocking. The special device is characterized by comprising a support device, a power control device and a clamp traction device, wherein the support device comprises a pair of rectangular steel base plates, four hydraulic jacks and one frame-shaped shoulder pole; the pair of rectangular steel base plates are arranged on two sides of a drilling hole in a parallel and symmetric manner; the hydraulic jacks are respectively arranged at end parts of the rectangular steel base plates; four corners of the frame-shaped shoulder pole are correspondingly arranged on the four hydraulic jacks; the power control device comprises an oil pump; an oil pump control valve is arranged on the oil pump; the oil pump control valve is connected with the four hydraulic jacks; the clamp traction device comprises a frame-shaped steel buckle clamp; the frame-shaped steel buckle clamp consists of a left half steel buckle and a right half steel buckle; steel wire ropes are arranged at four corners of the frame-shaped steel buckle clamp; the steel wire ropes are connected with the frame-shaped shoulder pole. The special device is simple in structure and can be assembled and used on site, and the drill bit can be safely and effectively taken out once the drill bit of the rotary drilling rig is blocked.

Description

technical field [0001] The invention relates to the field of pile foundation hole forming construction of a rotary drilling rig, in particular to a special device and method for picking up a drill bit when the rotary drilling rig is stuck. Background technique [0002] At present, with the advancement of industrial technology and the expansion of engineering construction scale, underground engineering such as pile foundations has become the most commonly used foundation form and load-bearing structure for high-rise or super high-rise buildings, railway road bridges and other building structures. The pile foundation hole-forming process is one of the most critical parts of the pile foundation construction process, and the quality of the hole-forming process will directly affect the later bearing capacity of the pile foundation. Rotary drilling rig is one of the most widely used mechanical equipment in the construction of pile foundation holes at present, but the rotary drilli...

AI Technical Summary

Problems solved by technology

Rotary drilling rig is one of the most widely used mechanical equipment in the construction of pile foundation holes at present, but the rotary drilling rig may get stuck from time to time during the drilling process. Although the probability of stuck drill is relatively small, once it happens It made many operators and construction workers helpless, and caused huge losses

The main reasons for drill sticking are as follows: 1. Geology: During the drilling and lifting process, the hole wall collapses and the drill is buried, or the drilling is too deep, and the drill teeth are stuck in the rock formation. Make the drill bit neither forward and reverse nor lift

2. Drilling bucket: The side teeth and side teeth of the drill bit are severely worn, and the diameter of the hole cannot meet the size requirements, so that there is no gap between the outer wall of the drill barrel and the hole wall, and it is caused by drilling too deep; or during the drilling process, the bottom of the bucket After opening, it gets stuck on the wall of the hole, the drill pipe cannot be rotated, and the main roll cannot be lifted up, causing the drill to get stuck

3. Manipulator: Due to the operator's mistake in drilling, the footage is too deep at one time, causing the hole wall to shrink, and the gap between the drill bit cylinder wall and the hole wall disappears, resulting in drill sticking; this situation occurs in the sticky mud layer or when the sand layer becomes a clay layer, it is easy to occur

4. Mud: The specific gravity of the mud preparation is too small, and the effect of adjusting the pressure is not obvious, resulting in the collapse of the hole wall

This approach takes a long time, is likely to cause huge economic losses, and seriously affects the construction progress

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