Internal-to-external braking double-tube drilling device

Abstract

The present invention discloses an inner-rotating and outer-braking double-tube drilling device, which belongs to the drilling machinery for pile foundation engineering; the inner drill rod of the braking device is connected to the power head of the ground drilling rig, and is connected to the hydraulic down-the-hole hammer drill bit at the bottom, so as to transmit the torque to the hydraulic down-the-hole hammer drill bit; the outer brake pipe is connected to the outer ring of the central swivel joint, connected to the ground section by section, and stopped by the stop frame on the power head. When the inner drill rod rotates, the inner ring of the central swivel joint rotates, and the outer ring of the central swivel joint does not rotate due to being connected to the outer brake pipe, so that the hydraulic oil pipe outside the outer brake pipe does not rotate, so that the hydraulic oil pipe does not entangle the drill tool, and the hydraulic down-the-hole hammer drill bit can continuously rotate in one direction for drilling. The present invention has a simple structure and is easy to operate. It solves the directional problem that the functional hydraulic pipeline outside the drill tool in the hole does not entangle the drill tool when the drill tool continuously rotates in one direction during drilling, and fills the world gap in this industry.

Description

Technical Field

[0001] The present invention belongs to the drilling equipment for pile foundation engineering, and particularly relates to an anti-rotation mechanism for a safe and reliable hydraulic pipeline. Background Art

[0002] In the prior art, during the construction of pile foundations in rock layers, it is very difficult to drive piles in rock layers. The most advanced current pile driving technology in rock layers is to use pneumatic down-the-hole hammers and hydraulic down-the-hole hammer bits. During the use of the hydraulic down-the-hole hammer bit, the hydraulic oil pipe is externally placed on the drill tool. During construction, the prior art cannot solve the problem that the hydraulic oil pipe winds around the drill tool when the drill tool rotates, resulting in the drill tool being able to only rotate left and right but not continuously rotate during the drilling process, thus affecting the drilling quality (poor drilling perpendicularity). At the same time, the service life of the hydraulic oil pipe is short, it is easily broken, and it causes delays in work and time.

[0003] The technical difficulties to solve this problem are as follows:

[0004] 1. To ensure the construction torque, the torque needs to be transmitted from the power head of the surface drill rig to the downhole working device, and the high-pressure working medium pipeline cannot wind around the drill tool.

[0005] 2. In the prior art, the working medium is transmitted to the downhole working device through a hollow swivel joint, which involves the problem of stopping the hollow swivel joint. The stopping of the hollow swivel joint cannot damage the hole wall to prevent hole collapse and burying of the drill. Because in actual traditional construction, hole collapse and burying of the drill occur from time to time, and it is almost impossible to salvage. The probability of hole collapse cannot be increased due to the stopping structure.

[0006] 3. When the working device is drilling, the working medium pipeline also needs to descend, and the oil pipe cannot be pulled off.

[0007] 4. Protect the working medium pipeline to prevent leakage and other pollution of the environment and oil products. Summary of the Invention

[0008] The present invention provides a working medium pipeline braking device with a convenient structure, simple operation, safety and reliability, enabling the working medium to be transported to the bottom of the borehole, greatly increasing the service life of the pipeline, ensuring the drilling quality; and at the same time adding new construction ideas in pile construction.

[0009] To achieve the above object, the technical solution adopted by the present invention is an inner-rotation outer-braking device for the central swivel joint in the pile hole, and double pipes are used for drilling operations; the inner ring (42) of the central swivel joint is fixed on the inner drill pipe (3); the upper part of the inner drill pipe (3) is successively connected upward to the power head (1), and the lower part of the inner drill pipe (3) is connected to the working device (7), transmitting the rotational power of the power head (1) to the working device (7) through the inner drill pipe (3); the working medium required by the working device (7) is transmitted through the central swivel joint. An outer braking pipe (4) is sleeved outside the inner drill pipe (3), and the outer braking pipe (4) is successively connected upward to the power head (1); the telescopic stop pipe (2) on the power head (1) catches the cross bar (8) on the outer braking pipe (4) to prevent the outer braking pipe (4) from rotating; the acting force for preventing the outer braking pipe (4) from rotating is transmitted to the outer ring (41) of the central swivel joint at the bottom of the drill hole, making the outer ring (41) of the central swivel joint stationary; when the inner ring (42) of the central swivel joint rotates, the outer ring (41) of the central swivel joint does not rotate, and further the working medium pipeline on the outer ring (41) of the central swivel joint does not rotate, preventing entanglement with the outer braking pipe (4); this structure of double-pipe following and outer-pipe braking ensures that the external hydraulic oil pipe lowered into the drill hole does not get entangled, and during the drilling process, the drill tool drives the hydraulic down-the-hole hammer bit to continuously rotate and work.

[0010] As a further solution of the present invention: The outer braking pipe (4) is sleeved on the inner drill pipe (3) to form a combined drill pipe, and the working medium pipeline is on the outside of this combined drill pipe, that is, outside the outer braking pipe (4).

[0011] As a further solution of the present invention: The inner drill pipe (3) and the outer braking pipe (4) are connected as a whole and are simply referred to as a drill pipe. They can rotate relative to each other, facilitating installation and disassembly; alternatively, the inner drill pipe (3) and the outer braking pipe (4) are single rods and are installed separately.

[0012] As a further solution of the present invention: After two drill pipes (the drill pipe refers to the drill pipe formed by the combination of the outer braking pipe 4 and the inner drill pipe 3. They are assembled together but can rotate relative to each other) are connected, a transition braking cylinder (5) is needed in the middle, which is connected upward to the lower octagonal head (31) of the upper outer braking pipe (4) and downward to the upper octagonal head (32) of the lower outer braking pipe (4) to ensure the transmission of the braking torque of the outer braking pipe (4).

[0013] As a further solution of the present invention: The transition braking cylinder (5) is connected to the outer braking pipe (4) by octagonal sliding connection or a similar braking connection.

[0014] As a further solution of the present invention: The outer braking pipe (4) is connected and extends out of the ground, visible to the staff, and at the same time, the device for stopping the outer braking pipe (4) is also above the ground.

[0015] The beneficial effects of the present invention are as follows: the brake pipe extends above the ground, and it is a pure mechanical brake with strong visibility, good braking effect, and safety and reliability. The present invention can fully ensure braking. Compared with the existing braking technologies, all the braking devices are at the bottom of the hole, and the underground formation is complex, so the braking effect cannot be fully guaranteed; moreover, it is completely invisible, and it is unknown whether an accident has occurred. The braking effect of the present invention is visible. Since the braking force is transmitted to the ground through the outer brake pipe, it can be fully observed whether the outer brake pipe rotates. Compared with the bottom-hole braking form, the visibility effect of the present invention is more direct and convenient. The structure of the present invention is simple and convenient to disassemble, without increasing additional construction costs; compared with bottom-hole braking, the risk of hole collapse and drill pipe burial is reduced, and the risk of the rotating inner drill pipe rubbing against the oil pipe is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall braking device of the present invention.

[0017] Figure 2 It is a schematic diagram of the connection of the brake pipe of the present invention.

[0018] Figure 3 It is a schematic diagram of the double pipe of the present invention.

[0019] Figure 4 It is a schematic diagram of the telescopic stop pipe of the present invention.

[0020] Figure 5 It is a schematic diagram of the central swivel joint of the present invention.

[0021] In the figure: 1, power head; 2, telescopic stop pipe; 3, inner drill pipe; 4, outer brake pipe; 5, transition brake cylinder; 6, central swivel joint; 7, working device; 8, cross bar.

[0022] 31, lower octagonal head of the outer brake pipe 4; 32, upper octagonal head of the outer brake pipe 4.

[0023] 21, telescopic oil cylinder; 22, telescopic inner pipe; 23, telescopic outer pipe.

[0024] 41, outer ring of the central swivel joint; 42, inner ring of the central swivel joint. DETAILED DESCRIPTION OF THE INVENTION

[0025] The above description is only an overview of the present invention. In order to understand the technical means of the present invention more clearly and implement it according to the content of the specification, the following describes the preferred embodiments of the present invention in detail with reference to the accompanying drawings.

[0026] The inner drill pipe 3 can be made of 42CrMo seamless steel pipe with a diameter of Φ219mm, the outer brake pipe 4 can be made of Q345B seamless steel pipe with a diameter of Φ323mm, the transition brake cylinder 5 can be made by splicing Q345B steel plates or cold-drawn octagonal pipes, the central swivel joint 6 can be an assembly processed from 20CrMo carburized material, and the working device 7 is a drill bit composed of a hydraulic impact hammer set.

[0027] First, fix the inner ring (42) of the central swivel joint (6) on the inner drill pipe (3), fix the outer brake pipe (4) on the outer ring (41) of the central swivel joint (6), connect the lower end of the inner drill pipe (3) to the operating device (7), and then lower the entire device into the hole according to Figure 1 , into the hole.

[0028] Then, install the cross bar (8) on the upper octagonal head (32) of the outer brake pipe (4), use the power head to lift the double pipes (inner drill pipe (3) and outer brake pipe (4)), lift the transition brake cylinder (5) to expose the female connector of the inner drill pipe (3), lower the female connector of the inner drill pipe (3) by the power head (1) and insert it into the male connector of the lower drill pipe to complete the drill pipe connection; then rotate the transition brake cylinder (5) to align the transition brake cylinder (5) with the upper and lower octagonal heads of the outer brake pipe (4) to connect the upper outer brake pipe (4) and the lower outer brake pipe (4) to complete the brake pipe connection (see Figure 2 ). Then slightly move the power head (1), and at the same time, the inner pipe (22) of the stop pipe (2) extends under the action of the telescopic oil cylinder (21) and just catches the cross bar (8). When the power head rotates continuously, the outer ring (41) of the central swivel joint does not rotate due to the braking of the outer brake pipe (4), and the inner ring (42) of the central swivel joint and the inner drill pipe (3) rotate simultaneously, thus preventing the working medium pipeline installed on the outer ring (41) of the central swivel joint from winding around the outer brake pipe (4). When one drill pipe is drilled, connect the next drill pipe and drill in sequence.

[0029] This structure of double-pipe follow-up and inner rod rotation with outer pipe braking ensures that the external hydraulic oil pipe lowered into the hole does not wind, enabling the drill rig to drive the hydraulic down-the-hole hammer bit to rotate continuously during the drilling process.

Claims

1. Inner-rotating and outer-braking double-tube drilling device, characterized in that, This device uses a double-tube for drilling operations; the inner ring (42) of the central swivel joint is fixed to the inner drill pipe (3); the inner drill pipe (3) is successively connected upward to the power head (1), and the lower part of the inner drill pipe (3) is connected to the working device (7), transmitting the rotational power of the power head (1) to the working device (7) through the inner drill pipe (3); an outer brake pipe (4) is sleeved outside the inner drill pipe (3), and the outer brake pipe (4) is successively connected upward to the power head (1); the stop pipe (2) on the power head (1) catches the cross bar (8) on the outer brake pipe (4) to prevent the outer brake pipe (4) from rotating; The acting force preventing the outer brake pipe (4) from rotating is transmitted to the outer ring (41) of the central swivel joint at the bottom of the borehole, making the outer ring (41) of the central swivel joint stationary; when the inner ring (42) of the central swivel joint rotates, the outer ring (41) of the central swivel joint does not rotate, and the working medium pipeline on the outer ring (41) of the central swivel joint does not rotate; The outer brake pipe (4) is sleeved on the inner drill pipe (3) to form a drill pipe section in combination, and the working medium pipeline is outside this combined drill pipe, that is, outside the outer brake pipe (4); The inner drill pipe (3) and the outer brake pipe (4) are connected as a whole and can rotate relative to each other; alternatively, the inner drill pipe (3) and the outer brake pipe (4) are single rods and are installed separately; After two drill pipe sections are connected, a transition brake cylinder (5) is needed in the middle, which is connected upward to the lower octagonal head (31) of the upper drill pipe and downward to the upper octagonal head (32) of the lower drill pipe to ensure that the outer brake pipe (4) transmits the braking torque; The transition brake cylinder (5) is connected to the outer brake pipe (4) by an octagonal sliding connection; The outer brake pipe (4) is connected and extends out of the ground, and the device for stopping the outer brake pipe (4) is also above the ground; The working device is a hydraulic down-the-hole hammer bit; the inner ring (42) of the central swivel joint (6) is fixed to the inner drill pipe (3), the outer brake pipe (4) is fixed to the outer ring (41) of the central swivel joint (6), and the lower end of the inner drill pipe (3) is connected to the working device (7) and lowered into the hole; Install the cross bar (8) on the upper octagonal head (32) of the outer brake pipe (4). Use the power head to lift the double pipe and the transition brake cylinder (5), exposing the female connector of the inner drill pipe (3). Lower the female connector of the inner drill pipe (3) by the power head (1) and insert it into the male connector of the lower drill pipe to complete the connection of the drill pipes. Then rotate the transition brake cylinder (5) to align the lower octagonal head (31) of the upper outer brake pipe (4) with the upper octagonal head (32) of the lower outer brake pipe (4), and connect the upper outer brake pipe (4) with the lower outer brake pipe (4) to complete the connection of the brake pipes. Then slightly move the power head (1), and at the same time, the inner pipe (22) of the stop pipe (2) extends under the action of the telescopic oil cylinder (21) and just catches the cross bar (8). When the power head rotates continuously, the outer ring (41) of the central swivel joint does not rotate due to the braking of the outer brake pipe (4), while the inner ring (42) of the central swivel joint and the inner drill pipe (3) rotate simultaneously, thus preventing the working medium pipeline installed on the outer ring (41) of the central swivel joint from winding around the inner drill pipe (3). When one drill pipe is completed, connect the next drill pipe and drill in sequence. The structure of double pipe following and inner rod rotating with outer pipe braking ensures that the external hydraulic oil pipe lowered into the hole does not wind, enabling the drill rig to drive the hydraulic down-the-hole hammer bit to rotate continuously during the drilling process.

2. The internal-rotation and external-braking double-tube drilling device according to claim 1, wherein The working medium required by the working device (7) is transmitted through the central swivel joint.

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