Drill bit connecting structure for cast-in-situ bored pile

Abstract

The utility model relates to the technical field of cast-in-place pile drill bits, and discloses a drill bit connecting structure for a cast-in-situ bored pile. According to the equipment body, a connecting assembly is arranged at the bottom of a drill rod; the drill is arranged at the bottom of the connecting assembly. A buffer assembly is arranged between the connecting assembly and the drill bit and comprises a connecting rod arranged at the bottom of the connecting assembly, and a containing groove matched with the connecting rod is formed in the drill bit; the first limiting plate is arranged at the bottom of the connecting rod and located in the containing groove. The damper is arranged between the first limiting plate and the containing groove. The positioning plate is symmetrical to the outer side of the first limiting plate, and a sliding groove matched with the positioning plate is formed in the containing groove; the sliding rod is arranged in the sliding groove and penetrates through the positioning plate. The supporting assembly is arranged on the connecting assembly and the drill bit, the perpendicularity of the drill bit in the telescopic movement process is guaranteed through the buffering assembly, and the perpendicularity effect of the drill bit in the drilling process is improved.

Description

Technical Field

[0001] This utility model relates to the field of drill bit technology for bored piles, specifically a drill bit connection structure for bored piles. Background Technology

[0002] Drilled piles possess advantages such as high bearing capacity, strong adaptability, and pile lengths reaching hundreds of meters, thus reducing the number of piles required. They have become the preferred foundation type for buildings and structures both domestically and internationally, especially large structures such as bridges, oil tanks, liquefied natural gas tanks, and nuclear power plants. Drilled piles are a widely used foundation structure in engineering. Due to their simple operation and strong applicability, they have always been favored by the engineering community. However, current drill bits for drilled piles are often damaged during use due to collisions with hard objects, requiring reassembly before construction can continue. The installation structure of the drill bits is complex, making installation and disassembly difficult, significantly prolonging the time required for assembly and disassembly, resulting in low construction efficiency and increased construction costs. These issues have caused certain adverse effects in practical use. Therefore, we propose a drill bit connection structure for drilled piles.

[0003] For example, Chinese utility model patent CN202020303176.5 describes a drill bit connection structure for bored piles. This structure uses a first limiting plate and an elastic element to slide elastically within the drill bit's receiving groove. This sliding structure allows the drill bit to move up and down, providing a buffer space when it contacts the ground. This improves the drill bit's anti-collision performance, preventing direct impact with the ground and thus preventing breakage at the drill bit connection point, significantly increasing the drill bit's reliability. However, the design allowing the drill bit to move up and down can lead to deviations in borehole verticality, especially in alternating soft and hard strata, thus affecting the verticality of the drill bit. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a drill bit connection structure for bored piles, which has the advantage of high verticality and solves the problem of deviation in drilling verticality.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a drill bit connection structure for bored piles, comprising a device body; the device body includes: a connecting component disposed at the bottom of a drill rod; a drill bit disposed at the bottom of the connecting component; a buffer component disposed between the connecting component and the drill bit, the buffer component including: a connecting rod disposed at the bottom of the connecting component, and a receiving groove disposed inside the drill bit to accommodate the connecting rod; a first limiting plate disposed at the bottom of the connecting rod and located inside the receiving groove; a damper disposed between the first limiting plate and the receiving groove; a positioning plate symmetrically disposed on the outside of the first limiting plate, and a sliding groove disposed inside the receiving groove to accommodate the positioning plate; a sliding rod disposed inside the sliding groove and penetrating the positioning plate; and a support component disposed on the connecting component and the drill bit.

[0008] In some embodiments, a fixing seat is provided at the top opening of the receiving groove and is threadedly connected to the drill bit.

[0009] In some embodiments, a sealing gasket is provided at the through groove on the fixing seat and is located on the outside of the connecting rod.

[0010] In some embodiments, the connection assembly includes: a mounting base sleeved on the bottom of the drill pipe; and a fixing bolt passing through the mounting base and the drill pipe.

[0011] In some embodiments, the support assembly includes: a support rod symmetrical to the top of the drill bit, and a mounting base having a fixing groove that mates with the support rod.

[0012] In some embodiments, a second limiting plate is provided at the top of the support rod and is located inside the fixing groove.

[0013] In some embodiments, a damping plate that cooperates with the second limiting plate is provided inside the fixing groove.

[0014] In some embodiments, the damper is threadedly fixed to the receiving groove and the first limiting plate by bolts.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a drill bit connection structure for bored piles, which has the following advantages:

[0017] The drill bit connection structure of this bored pile uses a damper inside the receiving groove to reduce shock and buffer the impact force of the drill bit hitting the rock. At the same time, the first limiting plate slides up and down in the receiving groove through the positioning plate and works with the sliding rod to ensure that the first limiting plate moves vertically up and down in the receiving groove. The support component supports the torque force that drives the drill bit to rotate through the connecting rod, ensuring the verticality of the drill bit during telescopic movement and increasing the vertical effect of the drill bit during drilling. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0020] Figure 3 This is a schematic diagram of the drill bit structure in this utility model.

[0021] In the picture:

[0022] 1. Equipment body; 11. Drill rod; 12. Drill bit; 13. Connecting assembly; 131. Mounting base; 132. Fixing bolts;

[0023] 2. Buffer assembly; 21. Connecting rod; 22. Receiving groove; 23. First limiting plate; 24. Damper; 25. Positioning plate; 251. Slide groove; 252. Slide rod; 26. Support assembly; 261. Support rod; 262. Fixing groove; 263. Second limiting plate; 264. Damping plate; 27. Fixing seat; 271. Sealing gasket. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0025] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0026] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0028] Drilled piles possess advantages such as high bearing capacity, strong adaptability, and pile lengths reaching hundreds of meters, thus reducing the number of piles required. They have become the preferred foundation type for buildings and structures both domestically and internationally, especially large structures such as bridges, oil tanks, liquefied natural gas tanks, and nuclear power plants. Drilled piles are a widely used foundation structure in engineering. Due to their simple operation and strong applicability, they have always been favored by the engineering community. However, current drill bits for drilled piles are often damaged during use due to collisions with hard objects, requiring reassembly before construction can continue. The installation structure of the drill bits is complex, making installation and disassembly difficult, significantly prolonging the time required for assembly and disassembly, resulting in low construction efficiency and increased construction costs. These issues have caused certain adverse effects in practical use. Therefore, we propose a drill bit connection structure for drilled piles.

[0029] In related technologies, the design of drill bits that allow up-and-down movement can lead to deviations in borehole verticality, especially in formations with alternating soft and hard surfaces, thus affecting the verticality of the drill bit.

[0030] To address some of the problems in the related technologies, this application provides a drill bit connection structure for bored piles. When the drill bit strikes rock in the soil, the drill bit 12 retracts, causing the first limiting plate 23 to compress and dampen the damper 24 inside the receiving groove 22, thereby buffering the impact force of the drill bit 12 striking the rock. At the same time, the first limiting plate 23 slides up and down in the receiving groove 22 through the positioning plate 25 and cooperates with the slide rod 252 to ensure that the first limiting plate 23 moves vertically up and down in the receiving groove 22. The support component 26 supports the torque force that drives the connecting rod 21 to rotate the drill bit 12.

[0031] This application is described below with reference to the accompanying drawings and specific embodiments:

[0032] Combination Figures 1-3 This application provides a drill bit connection structure for bored piles, including a device body 1. The device body 1 includes: a connecting component 13 disposed at the bottom of a drill rod 11; a drill bit 12 disposed at the bottom of the connecting component 13; a buffer component 2 disposed between the connecting component 13 and the drill bit 12, the buffer component 2 including: a connecting rod 21 disposed at the bottom of the connecting component 13, and a receiving groove 22 disposed inside the drill bit 12 to accommodate the connected rod 21; a first limiting plate 23 disposed at the bottom of the connecting rod 21 and located inside the receiving groove 22; a damper 24 disposed between the first limiting plate 23 and the receiving groove 22; a positioning plate 25 symmetrical to the outside of the first limiting plate 23, and a sliding groove 251 disposed inside the receiving groove 22 to accommodate the positioning plate 25; a sliding rod 252 disposed inside the sliding groove 251 and penetrating the positioning plate 25; and a support component 26 disposed on the connecting component 13 and the drill bit 12.

[0033] During use, the drilling rig drives the drill bit 12 to rotate and drill through the drill rod 11. When the drill bit 12 hits the rock in the soil layer during downward drilling, the drill bit 12 retracts, causing the first limiting plate 23 to squeeze and dampen the damper 24 inside the receiving groove 22, thereby buffering the impact force of the drill bit 12 hitting the rock. At the same time, the first limiting plate 23 slides up and down in the receiving groove 22 through the positioning plate 25 and cooperates with the slide rod 252 to ensure that the first limiting plate 23 moves vertically up and down in the receiving groove 22. The support component 26 supports the torque force of the connecting rod 21 driving the drill bit 12 to rotate, ensuring the verticality of the drill bit 12 during telescopic movement and increasing the vertical effect of the drill bit 12 during drilling. When the drill bit 12 is severely worn, it can be replaced through the connecting component 13.

[0034] In some embodiments, a fixing seat 27 is provided at the top opening of the receiving groove 22 and is threadedly connected to the drill bit 12, covering the top opening of the receiving groove 22 to prevent gravel from entering the receiving groove 22.

[0035] In some embodiments, a sealing gasket 271 is provided at the through groove on the fixing seat 27 and is located on the outside of the connecting rod 21, which increases the sealing of the inside of the receiving groove 22 and prevents mud from entering the receiving groove 22.

[0036] In some embodiments, the connecting assembly 13 includes: a mounting base 131 sleeved on the bottom of the drill rod 11; and a fixing bolt 132 passing through the mounting base 131 and the drill rod 11, so that the drill bit 12 can be replaced by removing and installing the fixing bolt 132.

[0037] Specifically, an elastic washer is provided on the fixing bolt 132 to prevent the fixing bolt 132 from loosening due to vibration.

[0038] In some embodiments, the support assembly 26 includes a support rod 261 symmetrical to the top of the drill bit 12, and a fixing groove 262 that cooperates with the support rod 261 is provided inside the mounting base 131. When the drill bit 12 moves in extension and retraction, the support rod 261 moves in the fixing groove 262 and supports the drill bit 12, increasing the torque force of the connecting rod 21 driving the drill bit 12 to rotate.

[0039] In some embodiments, a second limiting plate 263 is provided at the top of the support rod 261 and is located inside the fixing groove 262 to limit the support rod 261 and prevent the support rod 261 from detaching from the fixing groove 262.

[0040] In some embodiments, a damping plate 264 that cooperates with the second limiting plate 263 is provided inside the fixing groove 262. When the support rod 261 moves in the fixing groove 262, it will impact the damping plate 264 to relieve the impact force.

[0041] In some embodiments, the damper 24 is threadedly fixed to the receiving groove 22 and the first limiting plate 23 by bolts, which facilitates the disassembly and replacement of the damper 24 inside the receiving groove 22.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," and "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0043] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A drill bit connection structure for bored piles, comprising a device body (1); the device body (1) comprising: The drill pipe (11) has a connecting component (13) at its bottom. A drill bit (12) is disposed at the bottom of the connecting assembly (13); The feature is that a buffer assembly (2) is provided between the connecting assembly (13) and the drill bit (12), the buffer assembly (2) comprising: A connecting rod (21) is provided at the bottom of the connecting assembly (13), and the drill bit (12) has a receiving groove (22) that matches the connecting rod (21). The first limiting plate (23) is disposed at the bottom of the connecting rod (21) and located inside the receiving groove (22); A damper (24) is disposed between the first limiting plate (23) and the receiving groove (22); The positioning plate (25) is symmetrical to the outside of the first limiting plate (23), and the receiving groove (22) is provided with a sliding groove (251) that matches the positioning plate (25). A slide bar (252) is disposed inside the slide groove (251) and passes through the positioning plate (25). A support component (26) is disposed on the connecting component (13) and the drill bit (12).

2. The drill bit connection structure for bored piles according to claim 1, characterized in that: A fixing seat (27) is provided at the top opening of the receiving groove (22) and is threadedly connected to the drill bit (12).

3. The drill bit connection structure for bored piles according to claim 2, characterized in that: A sealing gasket (271) is provided at the through groove on the fixed seat (27) and is located on the outside of the connecting rod (21).

4. The drill bit connection structure for bored piles according to claim 1, characterized in that: The connection component (13) includes: Mounting base (131) is fitted onto the bottom of the drill rod (11); A fixing bolt (132) passes through the mounting base (131) and the drill rod (11).

5. The drill bit connection structure for bored piles according to claim 4, characterized in that: The support component (26) includes: The support rod (261) is symmetrical to the top of the drill bit (12), and the mounting base (131) has a fixing groove (262) that matches the support rod (261).

6. The drill bit connection structure for bored piles according to claim 5, characterized in that: The top of the support rod (261) is provided with a second limiting plate (263), which is located inside the fixing groove (262).

7. The drill bit connection structure for bored piles according to claim 6, characterized in that: The fixed groove (262) is provided with a damping plate (264) that cooperates with the second limiting plate (263).

8. The drill bit connection structure for bored piles according to claim 1, characterized in that: The damper (24) is threadedly fixed to the receiving groove (22) and the first limiting plate (23) by bolts.

Images