Telescopic drill rod for vibro-replacement gravel construction
The telescopic drill rod design with large clearance fit and guide limit structure solves the problems of drill rod jamming and low efficiency in vibratory crushing construction, achieving rapid and reliable deep drilling and cost reduction.
Patent Information
- Application Number
- CN202511932610.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-19
- Publication Date
- 2026-01-27
AI Technical Summary
Existing vibratory compaction drilling systems suffer from problems such as low construction efficiency, easy jamming, high manufacturing costs, and complex maintenance. In particular, they are difficult to achieve rapid and continuous deep drilling under vibration and impact loads.
The drill pipe adopts a multi-section structure with large clearance, combined with a guide structure and a limiting structure to prevent drill pipe twisting and slippage. Reliable connection is achieved through movable rings and clamps, reducing manual rod connection and using shock-absorbing pads to reduce wear.
It enables rapid and continuous deep drilling of drill pipes, avoids drill pipe jamming, reduces manufacturing costs and maintenance difficulty, and improves construction efficiency and equipment reliability.
Smart Images
Figure CN121407855A_ABST
Abstract
Description
Technical Field
[0001] This invention patent relates to a telescopic drill rod for vibratory crushing of stone, belonging to the field of engineering machinery. Background Technology
[0002] Vibro-compaction stone pile construction is an important foundation treatment technology, and its construction depth and efficiency are directly limited by the performance of the drill pipe system. To achieve deep drilling requirements, existing technologies mainly employ two mainstream solutions, both of which have significant technical drawbacks:
[0003] Segmented drill pipe connection: This is the most traditional method, using single-section drill pipes of uniform length. Once the drilling depth of one section is reached, the machine must be stopped, and subsequent drill pipes are mechanically connected to the previous section on-site using auxiliary hoisting equipment and manual operation, such as flange bolting or welding. While this method is simple in structure and easy to manufacture, it suffers from frequent interruptions in construction, long auxiliary operation time, high labor intensity, and certain safety risks when connecting drill pipes at heights or in complex conditions, severely limiting construction efficiency and automation levels.
[0004] Small-gap multi-section telescopic drill pipe: To solve the problem of frequent pipe splicing, a multi-section, nested, telescopic drill pipe structure has been developed. This type of drill pipe prioritizes structural compactness, with extremely small clearances between each section. However, in the specific scenario of vibro-compacting rock breaking construction, this design reveals inherent and insurmountable defects: First, under repeated vibration and impact loads, rock particles in the strata easily intrude and become trapped in the narrow clearances, causing the drill pipe sections to jam, resulting in construction interruptions or even equipment damage, leading to poor reliability. Second, maintaining the small clearances and preventing mud intrusion requires extremely high processing precision and heat treatment processes, resulting in high manufacturing costs and the need for complex sealing structures, making maintenance difficult. Furthermore, the slender nested rods, guided only by the small clearances, lack sufficient torsional resistance and overall stability, easily affecting the verticality of the pile.
[0005] In summary, existing technologies face significant challenges in practical applications, including low construction efficiency, susceptibility to rod jamming, and high manufacturing and maintenance costs. Therefore, there is an urgent need for a new drill pipe structure that enables rapid and continuous deep drilling, eliminates the need for manual rod splicing, fundamentally adapts to the harsh conditions of vibro-compaction rock breaking processes, completely solves the rod jamming problem, and simultaneously possesses excellent manufacturability and economic efficiency. Summary of the Invention
[0006] To address the aforementioned problems, this invention discloses a telescopic drill rod for vibratory crushing of stone, mainly comprising, from the outside in, nested drill rods, a movable ring, a clamp, a shock-absorbing pad, a tray, and a connecting plate. Through the coordinated use of several drill rod sections equipped with guiding devices and clamps, each drill rod section can freely extend and retract within the guide rail; each drill rod section employs a large-clearance fit to prevent jamming. The guiding effect of the guide rail prevents torsion of the inner drill rod section during extension and retraction; the prefabricated clamps provide a limiting effect, ensuring reliable connection of each drill rod section when the required construction depth is reached. The free extension and retraction of the drill rods and the limiting effect of the clamps structurally reduce the need for manual rod splicing, improve construction efficiency, and reduce operating costs.
[0007] To achieve the above objectives, the present invention adopts the following technical solution:
[0008] A telescopic drill rod for vibratory crushing of rock includes multiple drill rod sections nested sequentially from the outside in, with a large clearance fit between each section; a guide structure is provided between each section to prevent the inner section from twisting during telescoping; the drill rod system also includes a limiting structure to prevent each section from slipping during telescoping.
[0009] Furthermore, an outer guide key is provided on the outer side of the drill pipe.
[0010] Furthermore, it also includes a shock-absorbing pad located on the upper outer side of the drill pipe.
[0011] Furthermore, the multi-section drill pipe includes an outer section, at least one intermediate section, and an inner section.
[0012] Furthermore, the guide structure includes: a first guide rail on the lower inner side of the outer section rod, and a first guide key strip on the outer side of the middle section rod that cooperates with the first guide rail; a second guide rail on the lower inner side of the middle section rod, and a second guide key strip on the outer side of the inner section rod that cooperates with the second guide rail.
[0013] Furthermore, the limiting structure includes a movable ring and a clamp at the upper end of the middle section rod and the inner section rod. The movable ring can rotate freely and has the ability to move up and down within a small range. The movable ring and / or the clamp are fitted with the inner wall of the drill pipe with a small clearance.
[0014] Furthermore, the lower end of the inner section rod is provided with a tray, the diameter of which is not less than the outer diameter of the outer section rod, for supporting the outer section rod and the intermediate section rod during lifting; the upper end of the inner section rod is provided with a connecting lug, which is connected to the lifting collar.
[0015] Furthermore, the lower end of the tray is provided with a connecting plate for connecting the vibratory impact working device.
[0016] Furthermore, the inner section rod has a hollow structure and is equipped with several pipe clamps inside to fix water, electricity and gas pipelines, reducing vibration and wear during construction.
[0017] Furthermore, the width of the large gap is 3-5 times the diameter of the filling particles during construction.
[0018] Compared with the prior art, the beneficial effects of the present invention are:
[0019] 1. Each section of steel pipe is fitted with a large clearance, the clearance being approximately 3-5 times the diameter of the filling particles, to prevent jamming.
[0020] 2. It is simple to process and manufacture, has anti-torsion function, and does not require consideration of sealing issues.
[0021] 3. The clamp has the function of cleaning the inner wall of the drill pipe, further preventing the occurrence of pipe jamming. Attached Figure Description
[0022] Figure 1 : A schematic diagram of the telescopic drill rod of the present invention;
[0023] Figure 2 Top view of the telescopic drill pipe described in this invention;
[0024] Figure 3 : A schematic diagram of the installation of the clamp described in this invention;
[0025] Figure 4 : A schematic diagram of the tray and connecting plate described in this invention;
[0026] Figure 5 : Schematic diagram of the tube clamp described in this invention;
[0027] In the diagram: 1. Outer section rod, 2. Middle section rod, 3. Inner section rod, 4. Shock-absorbing pad, 5. Moving ring, 6. Middle clamp, 7. Inner section clamp, 8. Lifting collar, 9. Tray, 10. Connecting plate, 11. Outer guide key, 12. Inner guide block one, 13. Inner guide key one, 14. Inner guide block two, 15. Inner guide key two, 16. Pin, 17. Anti-loosening nut, 18. Pipe clamp. Detailed Implementation
[0028] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments and specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations thereof. In the absence of conflict, the embodiments and technical features in the embodiments can be combined with each other.
[0029] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.
[0030] like Figure 1 As shown, this invention provides a telescopic drill rod for vibratory crushing of stone, comprising drill rods nested sequentially from the outside in. The drill rod consists of an outer section 1, a middle section 2, and an inner section 3, wherein the number of middle sections 2 can be increased as needed. The outer section 1, middle section 2, and inner section 3 are nested together to achieve the telescopic movement of the drill rod. Each section of the drill rod adopts a large clearance fit, with the clearance being approximately 3-5 times the diameter of the filling particles, which effectively prevents the filling particles from getting stuck in the gaps between the sections of the drill rod, achieving the effect of preventing the drill rod from getting stuck. Several external guide bars 11 are provided on the outer side of the outer section 1 and cooperate with the main machine holder to prevent the drill rod from twisting during construction.
[0031] like Figure 2 As shown, a first guide rail is radially arranged on the lower inner side of the outer section rod 1. In this embodiment, the first guide rail is formed by an inner guide block 12. An inner guide key 13, which cooperates with the first guide rail of the outer section rod 1, is arranged on the outer side of the middle section rod 2. The length of the inner guide key 13 is the same as the extension length of the middle section rod 2. The inner guide key 13 of the middle section rod 2 slides within the first guide rail arranged on the inner side of the outer section rod 1, realizing the guided extension of the middle section rod 2 and preventing torsion. A second guide rail is radially arranged on the lower inner side of the middle section rod 2. In this embodiment, the second guide rail is formed by an inner guide block 14. An inner guide key 15, which cooperates with the second guide rail of the middle section rod 2, is arranged on the outer side of the inner section rod 3. The length of the inner guide key 15 is the same as the extension length of the inner section rod 3. The inner guide key 15 of the inner section rod 3 slides within the second guide rail arranged on the inner side of the middle section rod 2, realizing the extension of the inner section rod 3 and preventing torsion.
[0032] like Figure 1As shown, the outer section 1 is equipped with a shock-absorbing pad 4 at its upper outer end to reduce the impact and wear of the drill rod caused by vibration during construction, thus extending the service life of the drill rod. The upper end of the middle section 2 is equipped with a collar for assembling the movable ring 5 and the intermediate clamp 6; the upper end of the inner section 3 is equipped with a collar for assembling the movable ring 5 and the inner clamp 7. The movable ring 5, intermediate clamp 6, and inner clamp 7 are fitted with the inner wall of the drill rod steel pipe with a small clearance. The movable ring 5 can rotate freely and move up and down within a small range, reducing the rigid impact after the drill rod is fully extended. The clamp adopts an assembled two-part structure with several grooves on the inner side. These grooves mate with the annular limiting ring 19 on the drill rod body, connected by threads. After assembly, the clamp can rotate freely but cannot move up and down. The movable ring 5, intermediate clamp 6, and inner clamp 7 are fitted with the corresponding outer drill rod inner wall with a small clearance. When the drill rod extends or retracts, the clamp can prevent the drill rod from shaking; it can also clean the inner wall of the steel pipe to prevent the rod from jamming.
[0033] When the clamp extends or retracts with the drill pipe to the guide rail position, the clamp fits into the guide rail, thus achieving the function of preventing the drill pipe from detaching.
[0034] like Figure 3 As shown, the intermediate clamp 6, the inner clamp 7, and the drill pipe are connected by pins 16 and anti-loosening nuts 17 to ensure reliable connection.
[0035] like Figure 1 and Figure 4 As shown, a tray 9 is provided at the lower end of the inner section rod 3, and the diameter of the tray 9 is not less than the outer diameter of the outer section rod 1. A connecting lug is provided at the upper end of the inner section rod 3, which is connected to the lifting collar 8; through the action of the lifting collar 8, the outer section rod 1 and the intermediate section rod 2 are supported by the tray 9 and lifted together. A connecting plate 10 is provided at the lower end of the tray 9 for connecting the working device.
[0036] like Figure 1 and Figure 5 As shown, the inner section rod 3 adopts a hollow structure. The water, electricity, and gas pipes used in construction are clamped through several pipe clamps 18 and pass through the inner section rod 3, which can reduce the vibration and wear of water, electricity, and gas during construction and extend their service life. In this embodiment, the pipe clamp 18 is a multi-lobed pipe clamp ring.
[0037] In actual construction, the telescopic drill rod of the present invention can be divided into the following stages:
[0038] 1. Initial Retracted State: Before construction begins, the drill pipe is in a fully retracted state. The outer section 1, the middle section 2, and the inner section 3 are nested sequentially, with a large clearance between each section, approximately 3-5 times the diameter of the filling particles, to prevent particle jamming. At this time, the tray 9 is at the bottom, and the connecting plate 10 is connected to the working device.
[0039] 2. Drilling and Rod Extension Process: After construction begins, the vibration device transmits the vibration force to the drill pipe system through the connecting plate 10. The rod extension process is as follows:
[0040] Phase 1: The outer section 1, middle section 2, and inner section 3 are lowered into the drill string as a whole until the maximum designed drilling depth of the outer section 1 is reached. At this time, the shock-absorbing pad 4 set on the upper outer side of the outer section 1 rests on the upper end of the drill string holder, which plays a role in buffering and shock absorption, reducing the impact and wear on the upper structure of the drill string due to continuous vibration.
[0041] Phase Two: After the outer section 1 is limited by the shock-absorbing pad 4, it remains relatively stationary. The intermediate section 2 and the inner section 3 continue to drill synchronously under power drive. The intermediate section 2 slides internally via the inner guide key 13 on its outer side and the inner guide block 12 forming the first guide rail on the inner side of the outer section 1, thus achieving guidance and preventing torsion. This process continues until the intermediate section 2 reaches its maximum stroke. The limiting retaining ring at the lower end of the outer section 1 limits the movable ring 5 of the intermediate section 2 to prevent the drill pipe from extending excessively or slipping.
[0042] Third stage: After the intermediate section 2 reaches its maximum stroke, it remains relatively stationary after being limited by the movable ring 5. The inner section 3 continues drilling independently. The inner guide key 15 on its outer side slides inward on the second guide rail inside the intermediate section 2, formed by the inner guide block 14, until the designed total drilling depth is reached. The limiting stop ring at the lower end of the intermediate section 2 limits the movable ring 5 of the inner section 3 to prevent the drill pipe from extending excessively or slipping.
[0043] If a greater drilling depth is required, the number of intermediate rod sections 2 can be increased. Their extension mechanism is similar to the second stage described above: after the previous rod section reaches its stroke end, the next rod section continues to extend synchronously or sequentially with all internal rod sections. Throughout the rod extension process, the movable ring 5 and the clamp move together with the corresponding drill rod and maintain a small clearance fit with the inner wall of the drill rod, thus cleaning the inner wall and preventing rod jamming.
[0044] 3. Retraction Process: After construction is completed, the lifting ring 8 is pulled upwards using the lifting system. The inner section rod 3 retracts first, and the weight of the outer and middle sections rods is supported by the tray 9, causing the middle section rod 2 and the outer section rod 1 to retract sequentially. The guide key strips and guide rails between each section continue to provide guidance, ensuring a smooth and torsion-free retraction process.
[0045] During the recovery process, the movable ring 5 and the clamp continue to clean the inner wall of the drill pipe to prevent impurities from remaining. The vibration damping pad 4 continues to act as a buffer during vibration construction, protecting the drill pipe structure.
[0046] 4. Pipeline protection: During construction, water, electricity and gas pipelines are transported through the hollow channel inside the inner section rod 3 and clamped and fixed by the pipe clamp 18 to reduce pipeline wear and vibration caused by vibration and extend service life.
[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention.
[0048] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
Claims
1. A telescopic drill rod for vibratory crushing of stone, characterized in that, It includes multiple drill pipe sections nested from the outside in, with each section of drill pipe using a large clearance fit; A guide structure is provided between each section of the drill pipe to prevent the inner section of the drill pipe from twisting during the extension and retraction process; The drill pipe system also includes a limiting structure to prevent the drill pipe sections from slipping during extension and retraction.
2. The telescopic drill rod according to claim 1, characterized in that, The drill pipe is provided with an external guide key.
3. The telescopic drill pipe according to claim 1, characterized in that, It also includes a shock-absorbing pad located on the upper outer side of the drill pipe.
4. The telescopic drill rod according to claim 1, characterized in that, The multi-section drill pipe includes an outer section, at least one intermediate section, and an inner section.
5. The telescopic drill rod according to claim 4, characterized in that, The guiding structure includes: The lower inner side of the outer section rod is provided with a first guide rail, and the outer side of the middle section rod is provided with a first guide key that cooperates with the first guide rail; The lower inner side of the middle section rod is provided with a second guide rail, and the outer side of the inner section rod is provided with a second guide key that cooperates with the second guide rail.
6. The telescopic drill pipe according to claim 4, characterized in that, The limiting structure includes a middle section rod and an inner section rod with a movable ring and a clamp at the upper end. The movable ring can rotate freely and has the ability to move up and down within a small range. The movable ring and / or clamp are fitted with the inner wall of the drill pipe with a small clearance.
7. The telescopic drill rod according to claim 4, characterized in that, The lower end of the inner section rod is provided with a tray, the diameter of which is not less than the outer diameter of the outer section rod, for supporting the outer section rod and the middle section rod during lifting; The upper end of the inner section rod is provided with a connecting lug, which is connected to the lifting collar.
8. The telescopic drill pipe according to claim 7, characterized in that, The lower end of the tray is provided with a connecting plate for connecting the vibratory impact working device.
9. The telescopic drill pipe according to claim 4, characterized in that, The inner section rod has a hollow structure and contains several pipe clamps to fix water, electricity and gas pipelines, reducing vibration and wear during construction.
10. The telescopic drill pipe according to any one of claims 1-9, characterized in that, The width of the large gap is 3-5 times the diameter of the filling particles during construction.