Plug-in type double-drill-rod structure

Abstract

The utility model discloses a plug-in type double-drill-rod structure, which belongs to the field of geotechnical engineering construction equipment and comprises an inner drill rod, an outer drill rod, an outer drill rod male joint, an inner drill rod male joint, an outer drill rod female joint, an inner drill rod female joint, a fixing nut, a radial positioning sleeve, an axial positioning sleeve and a wear-resistant sleeve. The two ends of the outer drill rod are connected with the outer drill rod male connector and the outer drill rod female connector respectively through welding, the outer drill rod is connected with the inner drill rod female connector through the fixing nut, the radial positioning sleeve and the axial positioning sleeve are arranged between the inner drill rod male connector and the outer drill rod male connector, and the inner drill rod is limited and fixed through the inner drill rod male connector and the inner drill rod female connector. A wear-resistant sleeve is arranged in the outer drill rod in the axial direction and fixed to the outer drill rod through countersunk bolts. The positioning sleeve and the wear-resistant sleeve are arranged to centralize and restrain the inner drill rod, collision and friction between the inner drill rod and the outer drill rod are prevented, and the stability of the drill rod structure is ensured.

Description

Technical Field

[0001] The utility model relates to the field of geotechnical engineering construction equipment, in particular to a plug-in type double drill rod structure. Background Art

[0002] Ground treatment is an important project in civil engineering. It is the foundation of buildings or other structures. The stability and safety of the building are ensured by reinforcing the foundation soil. Among them, mixing pile foundation technology is a commonly used ground treatment method. By injecting cement slurry or other solidifying materials underground, the soil and solidifying materials are fully mixed to form mixing piles, thereby increasing the bearing capacity and stability of the foundation.

[0003] The traditional mixing pile foundation construction method has the problem of uneven mixing. In order to solve this problem, researchers have begun to focus on the improvement and optimization of mixing technology in recent years, aiming to improve construction efficiency, reduce construction costs, and improve construction quality. At present, the most improved direction is the two-way mixing process, which uses two coaxial drill rods that rotate in opposite directions to achieve the purpose of forced shear mixing. However, the drill rod structure of the two-way mixing equipment currently on the market is relatively backward, and the stability of the drill rod is poor. During the construction process, due to the rapid rotation of each other, collisions occur between the inner and outer drill rods, which affects the service life of the drill rod, and the construction noise is relatively large, which does not meet the standards of green construction. Based on this, the utility model proposes a plug-in double drill rod structure. Summary of the invention

[0004] In view of the above technical problems existing in the prior art, the utility model proposes a plug-in double drill rod structure, which overcomes the shortcomings of the prior art. By setting a positioning sleeve and a wear-resistant sleeve to straighten and constrain the inner drill rod, collision and friction between the inner drill rod and the outer drill rod are prevented, thereby ensuring the stability of the drill rod structure.

[0005] A plug-in double drill rod structure, characterized in that it includes an inner drill rod, an outer drill rod, an outer drill rod male joint, an inner drill rod male joint, an outer drill rod female joint, an inner drill rod female joint, a fixing nut, a radial positioning sleeve, an axial positioning sleeve, and a wear-resistant sleeve; the outer drill rod male joint and the outer drill rod female joint are respectively connected at both ends of the outer drill rod by welding, the outer drill rod and the inner drill rod female joint are connected by a fixing nut, a radial positioning sleeve and an axial positioning sleeve are arranged between the inner drill rod male joint and the outer drill rod male joint, the inner drill rod is limited and fixed by the inner drill rod male joint and the inner drill rod female joint, a wear-resistant sleeve is axially arranged inside the outer drill rod, and the wear-resistant sleeve is fixed to the outer drill rod by a countersunk bolt.

[0006] Preferably, the outer drill rod is a square tube and the inner drill rod is a round tube.

[0007] Preferably, a wear-resistant sleeve is axially arranged inside the outer drill rod, the material of the wear-resistant sleeve is brass, there are four wear-resistant sleeves on each section, the four wear-resistant sleeves form a circular hole, the diameter of the circular hole is equal to the outer diameter of the inner drill rod.

[0008] Preferably, the fixing nut is a countersunk nut, which is installed on the side of the outer drill rod close to the outer drill rod female joint, and the fixing nut passes through the outer drill rod and is connected to the inner drill rod female joint.

[0009] Preferably, the inner drill rod male joint is provided with a spline, the inner drill rod female joint is provided with a corresponding spline, the inner drill rod male joint and the inner drill rod female joint are connected via the spline, and a sealing ring is provided at the end of the inner drill rod male joint.

[0010] Preferably, the external drill rod male joint and the external drill rod female joint are provided with pin holes, and the external drill rod male joint and the external drill rod female joint are connected by a threaded pin.

[0011] Beneficial technical effects brought by the present invention:

[0012] Setting a wear-resistant sleeve inside the outer drill pipe can solve the problem of buckling and deformation of the inner drill pipe due to its large slenderness ratio. The wear-resistant sleeve is equivalent to adding a fulcrum, reducing the buckling degree of the inner drill pipe, and thus reducing the collision and friction between the inner and outer drill pipes. At the same time, the wear-resistant sleeve is made of brass and can be disassembled to facilitate disassembly and replacement after long-term wear. The radial positioning sleeve is set to prevent direct contact between the inner drill pipe male joint and the outer drill pipe male joint. If direct contact is rotated in opposite directions for a long time, the material will be worn, resulting in structural instability and leakage. The axial positioning sleeve is used on the one hand to prevent direct contact between the inner drill pipe male joint and the outer drill pipe male joint, and on the other hand to limit the position of the inner drill pipe male joint, thereby limiting the position of the inner drill pipe. The inner drill pipe is limited in position by three structures: the wear-resistant sleeve, the inner drill pipe male joint, and the inner drill pipe female joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a cross-sectional view of a plug-in double drill rod structure.

[0014] Figure 2 This is a connection structure diagram of a wear-resistant sleeve and an outer drill rod in a plug-in double drill rod structure of the utility model.

[0015] Figure 3 This is a diagram showing the position of the countersunk nut for installing the wear-resistant sleeve on the outer drill rod in a plug-in double drill rod structure of the utility model.

[0016] Among them, 1-inner drill rod, 2-outer drill rod, 3-outer drill rod male joint, 4-inner drill rod male joint, 5-outer drill rod female joint, 6-inner drill rod female joint, 7-fixing nut, 8-radial positioning sleeve, 9-axial positioning sleeve, 10-sealing ring, 11-wear-resistant sleeve, 12-pin shaft hole. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Embodiment 1:

[0018] like Figures 1 to 3 As shown, a plug-in double drill pipe structure is characterized in that it includes an inner drill pipe 1, an outer drill pipe 2, an outer drill pipe male joint 3, an inner drill pipe male joint 4, an outer drill pipe female joint 5, an inner drill pipe female joint 6, a fixing nut 7, a radial positioning sleeve 8, an axial positioning sleeve 9, and a wear-resistant sleeve 11; the outer drill pipe male joint 3 and the outer drill pipe female joint 5 are respectively connected at both ends of the outer drill pipe 2 by welding, the outer drill pipe 2 and the inner drill pipe female joint 6 are connected by a fixing nut 7, a radial positioning sleeve 8 and an axial positioning sleeve 9 are arranged between the inner drill pipe male joint 4 and the outer drill pipe male joint 3, the inner drill pipe 1 is limited and fixed by the inner drill pipe male joint 4 and the inner drill pipe female joint 6, a wear-resistant sleeve 11 is axially arranged inside the outer drill pipe 2, and the wear-resistant sleeve 11 is fixed to the outer drill pipe 2 by countersunk bolts.

[0019] Preferably, the outer drill rod 2 is a square tube and the inner drill rod 1 is a round tube.

[0020] Preferably, a wear-resistant sleeve 11 is axially arranged inside the outer drill rod 2. The material of the wear-resistant sleeve 11 is brass. There are four wear-resistant sleeves 11 on each cross section. The four wear-resistant sleeves 11 form a circular hole. The diameter of the circular hole is equal to the outer diameter of the inner drill rod 1.

[0021] Preferably, the fixing nut 7 is a countersunk nut, which is installed on the side of the outer drill rod 2 close to the outer drill rod female joint 5, and the fixing nut 7 passes through the outer drill rod 2 and is connected to the inner drill rod female joint 6.

[0022] Preferably, the inner drill rod male joint 4 is provided with a spline, the inner drill rod female joint 6 is provided with a corresponding spline, the inner drill rod male joint 4 and the inner drill rod female joint 6 are connected via a spline, and a sealing ring 10 is provided at the end of the inner drill rod male joint 4.

[0023] Preferably, a pin hole 12 is provided on the external drill rod male joint 3 and the external drill rod female joint 5, and the external drill rod male joint 3 and the external drill rod female joint 5 are connected via a threaded pin. Embodiment 2:

[0024] Considering the wear during use, the drill pipe structure will be disassembled and installed, and the installation process will be described in detail:

[0025] like Figure 1-3 As shown, the wear-resistant sleeve 11 is first connected to the outer drill rod 2 by countersunk bolts, and one end of the outer drill rod 2 is welded to the outer drill rod female joint 5, and then the inner drill rod female joint 6 is connected to the outer drill rod 2 by countersunk bolts. The inner drill rod 1 is inserted into the outer drill rod 2 from the other end of the outer drill rod 2. At this time, the inner drill rod 1 is connected to the inner drill rod female joint 6 through the support of the wear-resistant sleeve 11, and the inner drill rod male joint 4, axial positioning sleeve 9, and radial positioning sleeve 8 are installed in sequence. Finally, the outer drill rod male joint 3 is connected to the outer drill rod 2 by welding. Before welding, the inner drill rod 1 is debugged so that the inner drill rod 1 can rotate flexibly before welding. After welding, the processing of one section of drill rod is completed. When two drill rods need to be connected, the inner drill rod male connector 4 is inserted into the inner drill rod female connector 6 of another drill rod, and the two inner drill rods 1 are connected through matching splines. After the inner drill rods 1 are connected, the outer drill rod male connector 3 is also inserted into the outer drill rod female connector 5 of another drill rod, and the outer drill rods 2 of the two drill rods are connected through a threaded pin. The threaded pin is used to ensure that the pin will not fall off. In addition, the thread has a limiting effect, so that the pin cannot be inserted too deeply to affect the rotation of the inner drill rod 1. After the threaded pin is inserted, the docking is completed, and the appropriate number of drill rod sections are connected according to construction needs.

[0026] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention also fall within the protection scope of the present invention.

Claims

1. A plug-in double drill pipe structure, characterized in that: It includes an inner drill rod, an outer drill rod, an outer drill rod male joint, an inner drill rod male joint, an outer drill rod female joint, an inner drill rod female joint, a fixing nut, a radial positioning sleeve, an axial positioning sleeve, and a wear-resistant sleeve; the outer drill rod male joint and the outer drill rod female joint are respectively connected at both ends by welding, the outer drill rod and the inner drill rod female joint are connected by a fixing nut, a radial positioning sleeve and an axial positioning sleeve are arranged between the inner drill rod male joint and the outer drill rod male joint, the inner drill rod is limited and fixed by the inner drill rod male joint and the inner drill rod female joint, a wear-resistant sleeve is axially arranged inside the outer drill rod, and the wear-resistant sleeve is fixed to the outer drill rod by countersunk bolts.

2. The plug-in double drill rod structure according to claim 1, characterized in that: The outer drill rod is a square tube and the inner drill rod is a round tube.

3. The plug-in double drill rod structure according to claim 1, characterized in that: A wear-resistant sleeve is axially arranged inside the outer drill rod. The wear-resistant sleeve is made of brass. There are four wear-resistant sleeves on each section. The four wear-resistant sleeves form a circular hole. The diameter of the circular hole is equal to the outer diameter of the inner drill rod.

4. The plug-in double drill rod structure according to claim 1, characterized in that: The fixing nut is a countersunk nut, which is installed on the side of the outer drill rod close to the outer drill rod female joint, and the fixing nut passes through the outer drill rod and is connected to the inner drill rod female joint.

5. The plug-in double drill rod structure according to claim 1, characterized in that: The inner drill rod male joint is provided with a spline, the inner drill rod female joint is provided with a corresponding spline, the inner drill rod male joint and the inner drill rod female joint are connected via the spline, and a sealing ring is provided at the end of the inner drill rod male joint.

6. The plug-in type double drill rod structure according to claim 1, characterized in that: The external drill rod male joint and the external drill rod female joint are provided with pin shaft holes, and the external drill rod male joint and the external drill rod female joint are connected by a threaded pin shaft.

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