A limiting piece for a three-axis mixing pile drill rod perpendicularity correction device

Abstract

The utility model discloses a kind of limiting pieces for three-axis mixing pile drill rod perpendicularity correction device, including two oppositely arranged limiting piece bodies, the inner side of each limiting piece body is equipped with at least one semicircular inner recess, when two limiting piece bodies are folded, corresponding semicircular inner recess is spliced to form circular hole to hold drill rod;Push force transmission device is arranged in the inner side of at least one limiting piece body;Push force transmission device includes rolling body receiving portion, which is fixedly arranged in the inner side of limiting piece body and located in the inner wall of inner recess;At least one rolling body is constrained in rolling body receiving portion, and can roll relative to limiting piece body;Contact piece is arranged between rolling body and drill rod, and is connected with rolling body receiving portion or limiting piece body, for dispersing the concentrated load applied by rolling body as surface load acting on the surface of drill rod, drill rod deformation caused by stress concentration can be avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of drill rod verticality correction devices, and in particular to a limiting component for a three-axis mixing pile drill rod verticality correction device. Background Technology

[0002] The verticality of the drill rod in a triaxial mixing pile is of paramount importance during construction. It is a key factor in ensuring the quality of pile formation and the effectiveness of the cutoff wall. Precise control of verticality can prevent problems such as pile tilting and breakage, thus ensuring that the pile reaches the designed depth and meets engineering requirements. Furthermore, good verticality is a prerequisite for the cutoff wall to effectively stop water flow. Therefore, during construction, the verticality of the drill rod in the triaxial mixing pile must be strictly controlled to ensure project quality and safety.

[0003] Disadvantages of existing technology: An existing triaxial mixing pile drill rod verticality correction device can adjust the verticality of the drill rod. The contact surface between the correction device and the drill rod is equipped with rollers to reduce the resistance of the drill rod. However, the force during the correction process is transmitted through the rollers and appears as a line load on the drill rod wall, which easily leads to stress concentration and deformation of the drill rod. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] The technical problem to be solved by this utility model is to provide a limiting component for a triaxial mixing pile drill rod verticality correction device, which disperses the concentrated load of the rolling element into a surface load acting on the drill rod through the contact component, thereby avoiding stress concentration in the drill rod and causing deformation.

[0006] (II) Technical Solution

[0007] The solution adopted by this utility model to solve the above-mentioned technical problems is a limiting component for a triaxial mixing pile drill rod verticality correction device, including two limiting component bodies arranged opposite to each other. Each limiting component body has at least one semi-circular concave part on its inner side. When the two limiting component bodies are closed, the corresponding semi-circular concave parts are joined together to form a circular hole to clamp the drill rod.

[0008] A thrust transmission device is disposed inside at least one of the limiting member bodies; the thrust transmission device includes...

[0009] A rolling element receiving portion is fixedly disposed on the inner side of the limiting member body and located on the inner wall of the recessed portion;

[0010] At least one rolling element is constrained within the rolling element receiving portion and is capable of rolling relative to the limiting member body;

[0011] A contact element, disposed between the rolling element and the drill rod and connected to the rolling element receiving portion or the limiting element body, is used to disperse the concentrated load applied by the rolling element into a surface load acting on the surface of the drill rod.

[0012] In some embodiments, the rolling element is a ball or a roller.

[0013] By adopting the above scheme, the concentrated load of the rolling element is distributed into a surface load acting on the drill rod through the contact element, so as to avoid stress concentration in the drill rod and deformation caused by the drill rod; the structure of the semi-circular concave part splicing into a circular hole is used to fit the standard cylindrical drill rod, and the opening and closing operation is simple.

[0014] In some embodiments, each of the limiting member bodies is provided with three recesses, the positions, diameters and spacing of the three recesses being matched with the three drill rods of the triaxial mixing pile machine.

[0015] By adopting the above solution, three drill rods can be constrained simultaneously by a single limiting component, ensuring the relative positional accuracy and synchronization of multiple drill rods during the correction process. This solves the core problems of pile body deviation and poor overlap caused by asynchronous single-axis correction in multi-axis equipment, greatly improving construction efficiency and wall quality.

[0016] In some embodiments, the thrust transmission device is disposed on the inner side of the two limiting member bodies arranged opposite to each other, realizing symmetrical force application from both sides of the drill rod, avoiding the additional bending moment caused by unilateral force application, so that the drill rod is straightened in pure pressure or slight bending state, the straightening process is more stable and accurate, and effectively prevents new deviations caused by uneven force during the straightening process.

[0017] In some embodiments, the rolling element receiving portion is an arc-shaped groove extending circumferentially along the concave portion.

[0018] In some embodiments, the number of rolling elements is multiple, and the multiple rolling elements are evenly distributed along the arc-shaped groove.

[0019] Specifically, "multiple" refers to three or more.

[0020] With the above scheme, multiple rolling elements share the load, making the pressure distribution transmitted to the contact parts and drill pipe more continuous and uniform; the rolling elements work alternately, making the movement smoother and reducing the possibility of jamming or vibration.

[0021] In some embodiments, the contact member has an L-shaped cross-section, including a connecting wall connected to the outer wall of the limiting member body and a contact wall arranged opposite to the outside of the rolling element receiving portion. The arc shape of the contact wall is consistent with the arc shape of the rolling element receiving portion. Furthermore, the outer arc surface of the contact wall near the rolling element receiving portion and the inner arc bottom surface of the rolling element receiving portion cooperate to form an arc track. The rolling element is constrained within the arc track and can roll along the arc track. The inner arc surface of the contact wall away from the rolling element receiving portion is in contact with the outer surface of the drill pipe to disperse the concentrated load transmitted by the rolling element into a surface load acting on the outer surface of the drill pipe.

[0022] In some embodiments, the overall arc shape of the connecting wall is consistent with the arc shape of the rolling element receiving portion, and overlaps the outer wall of the limiting member body.

[0023] Specifically, the contact element can rotate with the drill pipe to reduce frictional resistance when the drill pipe rotates.

[0024] In some embodiments, a baffle is also included, the baffle being configured to be inserted into or withdrawn from the rolling element receiving portion to block or release the rolling element.

[0025] In some embodiments, each of the recesses is provided with two baffles, which are respectively arranged at the two ends of the recesses; and the two baffles are inserted into or removed from the rolling element receiving portion simultaneously; when the two opposing recesses approach each other, the four baffles are removed from the rolling element receiving portion simultaneously, thereby releasing the rolling element located in the two rolling element receiving portions, so that the rolling element can roll along the circular hole formed by the two recesses; when the two opposing recesses move away from each other, the four baffles are inserted into the rolling element receiving portion simultaneously, thereby blocking the rolling element located in the two rolling element receiving portions, so as to prevent the rolling element from leaving the rolling element receiving portion.

[0026] With the above solution, the design of the baffle can prevent the rolling element from falling off and being lost from the end of the rolling element receiving part due to gravity or vibration when the limiting part body is open and not in working state; moreover, it is easy to disassemble and assemble. When it is necessary to replace the rolling element or contact part, the baffle can be closed to confine the rolling element to a local area, which is convenient for operation.

[0027] In some embodiments, a baffle control mechanism is further included, the baffle control mechanism comprising:

[0028] A trigger element is movably disposed on the contact surface opposite to the body of the limiting element;

[0029] A reset element acts on the trigger element to provide a force that resets the trigger element.

[0030] A rotating component, which is rotatably disposed within the body of the limiting component;

[0031] The first transmission mechanism has one end linked to the trigger and the other end linked to the rotating component, and is used to convert the linear motion of the trigger into the rotational motion of the rotating component.

[0032] The second transmission mechanism has one end linked to the baffle and the other end linked to the rotating component, and is used to convert the rotational motion of the rotating component into the linear motion of the baffle.

[0033] When the two limiting member bodies come close to each other, the contact surfaces of the two limiting member bodies press against the trigger member. The trigger member drives the rotating member to rotate through the first transmission mechanism. The rotating member then drives the baffle through the second transmission mechanism, causing the baffle to exit the rolling element receiving part.

[0034] When the two limiting member bodies move away from each other, the trigger member is reset under the action of the reset member, and drives the baffle to re-insert into the rolling element receiving part through the first transmission mechanism and the second transmission mechanism in sequence to block the rolling element.

[0035] In some embodiments, the reset member is a compression spring, which is disposed on one end of the trigger member near the body of the limiting member. When the two limiting member bodies come together and squeeze the trigger member, the compression spring will be compressed. When the two limiting member bodies move away from each other and release the trigger member, the rebound force of the compression spring will drive the trigger member to reset in the direction away from the limiting member bodies.

[0036] By adopting the above solution, the opening and closing of the baffle is automated through the baffle control mechanism, so that the opening and closing of the baffle is completely synchronized with the opening and closing of the limiting component body and is completed automatically without any additional manual operation.

[0037] In some embodiments, the first transmission mechanism includes a push rod fixedly connected to the trigger member, and a first connecting rod connecting the push rod and the rotating member, one end of the first connecting rod being hinged to the push rod and the other end being hinged to the rotating member; the second transmission mechanism is a second connecting rod connecting the rotating member and the baffle, one end of the second connecting rod being hinged to the rotating member and the other end being hinged to the baffle.

[0038] In some embodiments, the two limiting member bodies are brought closer together or moved away from each other by a driving device to clamp or release the drill pipe.

[0039] In some embodiments, the two ends of the limiting member body are provided with protruding or recessed slots for cooperating with the movable horizontal support of the verticality correction device to realize the positioning and fixation and horizontal movement of the limiting member body; wherein, the protruding slot is a T-shaped structure or a rectangular protrusion structure, and the recessed slot is a rectangular groove or a dovetail groove.

[0040] In some embodiments, the driving device drives the two limiting member bodies to move closer or further apart by driving the movable horizontal support of the verticality correction device.

[0041] In some embodiments, the drive device includes a hydraulic system.

[0042] (III) Beneficial Effects

[0043] Compared with the prior art, this utility model designs a limiting component for a triaxial mixing pile drill rod verticality correction device.

[0044] (1) This utility model disperses the concentrated load of the rolling element into a surface load acting on the drill rod through the contact element, avoiding stress concentration in the drill rod and causing deformation of the drill rod; it adopts a structure of semi-circular concave parts spliced ​​into a circular hole, which is compatible with standard cylindrical drill rods and is easy to open and close.

[0045] (2) This utility model can constrain three drill rods at the same time by using a limiting component, which ensures the relative position accuracy and synchronization of multiple drill rods during the correction process. It solves the core problems such as pile body deviation and poor overlap caused by the asynchronous correction of single axis in multi-axis equipment, and greatly improves construction efficiency and wall quality.

[0046] (3) The design of this utility model limits the thrust transmission device to be symmetrically arranged on the two limiting parts, which realizes the symmetrical application of force from both sides of the drill rod, avoids the additional bending moment caused by the application of force on one side, and makes the drill rod straightened in pure pressure or slight bending state. The straightening process is more stable and accurate, and effectively prevents new deviations caused by uneven force during the straightening process.

[0047] (4) This utility model uses multiple rolling elements to bear the load together, making the pressure distribution transmitted to the contact parts and drill rod more continuous and uniform; the rolling elements work alternately, making the movement smoother and reducing possible jamming or vibration;

[0048] (5) Through the design of the baffle, when the limiting part body is open and not in working state, the baffle can be inserted to prevent the rolling element from falling off and being lost from the end of the rolling element receiving part due to gravity or vibration; and it is easy to disassemble and assemble. When it is necessary to replace the rolling element or contact part, the baffle can be closed to limit the rolling element to a local area, which is convenient for operation.

[0049] (6) This utility model realizes the automation of the opening and closing of the baffle through the baffle control mechanism, so that the opening and closing of the baffle is completely synchronized with the opening and closing of the limiting part body and is completed automatically without any additional manual operation. Attached Figure Description

[0050] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a cross-sectional schematic diagram of a limiting component for a triaxial mixing pile drill rod verticality correction device according to the present invention.

[0052] Figure 2 This is a three-dimensional schematic diagram of a limiting component for a triaxial mixing pile drill rod verticality correction device according to the present invention.

[0053] Figure 3 This is a schematic diagram showing the position of the contact element in this utility model.

[0054] The component names corresponding to the various reference numerals in the figure are: 1. Limiting component body; 101. Recessed portion; 2. Rolling element; 3. Rolling element receiving portion; 4. Contact element; 401. Connecting wall; 402. Contact wall; 5. Rotating component; 6. Baffle; 7. Push rod; 8. Trigger element; 9. Reset element; 10. First connecting rod; 11. Second connecting rod. Detailed Implementation

[0055] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but should not be used to limit the scope of this utility model.

[0056] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0057] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0058] It should be noted that the following description covers various aspects of embodiments within the scope of the appended claims. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0059] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0060] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0061] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0062] like Figures 1-3As shown, this utility model provides a limiting member for a triaxial mixing pile drill rod verticality correction device, including two opposing limiting member bodies 1. Each limiting member body 1 has three semi-circular recesses 101 on its inner side. When the two limiting member bodies 1 are closed, the corresponding semi-circular recesses 101 are joined to form a circular hole to clamp the drill rod. A thrust transmission device is disposed inside the limiting member body 1. The thrust transmission device includes a rolling element receiving part 3, which is fixedly disposed inside the limiting member body 1 and located on the inner wall of the recesses 101. A plurality of rolling elements 2 are constrained in the rolling element receiving part 3 and can roll relative to the limiting member body 1. A contact member 4 is disposed between the rolling elements 2 and the drill rod and is connected to the rolling element receiving part 3 or the limiting member body 1, for dispersing the concentrated load applied by the rolling elements 2 into a surface load acting on the surface of the drill rod. In some embodiments, the rolling elements 2 are balls. By adopting the above scheme, the concentrated load of the rolling element 2 is distributed into a surface load acting on the drill rod through the contact element 4, avoiding stress concentration and deformation of the drill rod. The structure of the semi-circular concave portions 101 combined to form a circular hole is adapted to standard cylindrical drill rods, making opening and closing operations simple. In some embodiments, each limiting member body 1 is provided with three concave portions 101, the position, diameter, and spacing of which match the three drill rods of the triaxial mixing pile machine. By adopting the above scheme, three drill rods can be constrained simultaneously by a single limiting member, ensuring the relative positional accuracy and synchronization of multiple drill rods during the correction process. This solves the core problems of pile body deviation and poor overlap caused by asynchronous single-axis correction in multi-axis equipment, greatly improving construction efficiency and wall quality. In some embodiments, the thrust transmission device is disposed on the inner side of the two limiting member bodies 1 arranged opposite to each other, realizing symmetrical force application from both sides of the drill rod, avoiding the additional bending moment caused by unilateral force application, so that the drill rod is straightened in pure pressure or slight bending state, the correction process is more stable and accurate, and effectively prevents new deviations caused by uneven force during the correction process.

[0063] In some embodiments, the rolling element receiving portion 3 is an arc-shaped groove extending circumferentially along the concave portion 101. In some embodiments, a plurality of rolling elements 2 are evenly distributed along the arc-shaped groove. Specifically, "a plurality of" refers to three or more. Using the above scheme, the multiple rolling elements 2 share the load, making the pressure distribution transmitted to the contact element 4 and the drill rod more continuous and uniform; the rolling elements 2 work alternately, resulting in smoother movement and reducing possible jamming or vibration.

[0064] In some embodiments, the contact member 4 has an L-shaped cross-section, including a connecting wall 401 connected to the outer wall of the limiting member body 1, and a contact wall 402 disposed opposite to the rolling element receiving portion 3. The overall arc shape of the contact wall 402 is consistent with the arc shape of the rolling element receiving portion 3. Furthermore, the outer arc surface of the contact wall 402 near the rolling element receiving portion 3 and the inner arc bottom surface of the rolling element receiving portion 3 cooperate to form an arc track. The rolling element 2 is constrained within the arc track and can roll along the arc track. The inner arc surface of the contact wall 402 away from the rolling element receiving portion 3 is in contact with the outer surface of the drill rod to disperse the concentrated load transmitted by the rolling element 2 into a surface load acting on the outer surface of the drill rod. In some embodiments, the overall arc shape of the connecting wall 401 is consistent with the arc shape of the rolling element receiving portion 3 and overlaps the outer wall of the limiting member body 1. Specifically, the contact member 4 can rotate with the rotation of the drill rod to reduce the frictional resistance when the drill rod rotates.

[0065] In some embodiments, a baffle 6 is further included, which is configured to be inserted into or withdrawn from the rolling element receiving portion 3 to block or release the rolling element 2. In some embodiments, two baffles 6 are correspondingly provided in each of the recesses 101, and the two baffles 6 are respectively arranged on the two ends of the recesses 101; and the two baffles 6 are inserted into or withdrawn from the rolling element receiving portion 3 simultaneously; when the two opposing recesses 101 approach each other, the four baffles 6 are withdrawn from the rolling element receiving portion 3 simultaneously, thereby releasing the rolling element 2 located in the two rolling element receiving portions 3, so that the rolling element 2 can roll along the circular hole formed by the two recesses 101; when the two opposing recesses 101 move away from each other, the four baffles 6 are inserted into the rolling element receiving portion 3 simultaneously, thereby blocking the rolling element 2 located in the two rolling element receiving portions 3, thereby preventing the rolling element 2 from leaving the rolling element receiving portion 3. With the above solution, the design of the baffle 6 can prevent the rolling element 2 from falling off and being lost from the end of the rolling element receiving part 3 due to gravity or vibration when the limiting part body 1 is open and not in working state. Moreover, it is easy to disassemble and assemble. When it is necessary to replace the rolling element 2 or the contact part 4, the baffle 6 can be closed to limit the rolling element 2 to a local area, which is convenient for operation.

[0066] In some embodiments, a baffle 6 control mechanism is further included, the baffle 6 control mechanism including a trigger 8 movably disposed on the contact surface opposite to the limiting member body 1; a reset member 9 acting on the trigger 8 to provide a force for resetting the trigger 8; a rotating member 5 rotatably disposed within the limiting member body 1; a first transmission mechanism, one end of which is linked to the trigger 8 and the other end of which is linked to the rotating member 5, for converting the linear motion of the trigger 8 into the rotational motion of the rotating member 5; and a second transmission mechanism, one end of which is linked to the baffle 6 and the other end of which is linked to the rotating member 5, for converting the linear motion of the trigger 8 into the rotational motion of the rotating member 5. The rotational motion is converted into the linear motion of the baffle 6. When the two limiting member bodies 1 approach each other, the contact surfaces of the two limiting member bodies 1 press against the trigger 8. The trigger 8 drives the rotating member 5 to rotate through the first transmission mechanism. The rotating member 5 then drives the baffle 6 through the second transmission mechanism, causing the baffle 6 to exit the rolling element receiving part 3. When the two limiting member bodies 1 move away from each other, the trigger 8 is reset under the action of the reset member 9, and the baffle 6 is re-inserted into the rolling element receiving part 3 to block the rolling element 2 through the first transmission mechanism and the second transmission mechanism in sequence. In some embodiments, the reset member 9 is a compression spring, which is disposed on the end of the trigger 8 near the limiting member body 1. When the two limiting member bodies 1 approach each other and press against the trigger 8, the compression spring is compressed. When the two limiting member bodies 1 move away from each other and release the trigger 8, the rebound force of the compression spring will drive the trigger 8 to reset in the direction away from the limiting member body 1. By adopting the above scheme, the opening and closing of the baffle 6 is automated through the baffle 6 control mechanism, so that the opening and closing of the baffle 6 is completely synchronized with the opening and closing of the limiting member body 1 and is completed automatically without any additional manual operation. In some embodiments, the first transmission mechanism includes a push rod 7 fixedly connected to the trigger member 8, and a first connecting rod 10 connecting the push rod 7 and the rotating member 5. One end of the first connecting rod 10 is hinged to the push rod 7, and the other end is hinged to the rotating member 5. The second transmission mechanism is a second connecting rod 11 connecting the rotating member 5 and the baffle 6. One end of the second connecting rod 11 is hinged to the rotating member 5, and the other end is hinged to the baffle 6.

[0067] In some embodiments, the two limiting member bodies 1 are driven to move closer or further apart by a driving device (not shown in the figure) to clamp or release the drill pipe. In some embodiments, the two ends of the limiting member body 1 are provided with recessed slots for cooperating with the movable horizontal support of the verticality correction device to achieve positioning, fixing, and horizontal movement of the limiting member body 1; wherein the recessed slots are rectangular grooves. In some embodiments, the driving device drives the two limiting member bodies 1 to move closer or further apart by driving the movable horizontal support of the verticality correction device. In some embodiments, the driving device includes a hydraulic system.

[0068] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0069] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A limiting component for a triaxial mixing pile drill rod verticality correction device, characterized in that: It includes two opposing limiting member bodies (1), each of the limiting member bodies (1) has at least one semi-circular concave portion (101) on its inner side. When the two limiting member bodies (1) are closed, the corresponding semi-circular concave portions (101) are joined together to form a circular hole to clamp the drill rod. A thrust transmission device is disposed inside at least one of the limiting member bodies (1); the thrust transmission device includes The rolling element receiving part (3) is fixedly disposed inside the limiting member body (1) and located on the inner wall of the recess (101); At least one rolling element (2) is constrained within the rolling element receiving portion (3) and is capable of rolling relative to the limiting member body (1); A contact element (4) is disposed between the rolling element (2) and the drill rod and is connected to the rolling element receiving part (3) or the limiting element body (1) for dispersing the concentrated load applied by the rolling element (2) into a surface load acting on the surface of the drill rod.

2. The limiting component for the verticality correction device of a triaxial mixing pile drill rod according to claim 1, characterized in that: Each of the limiting components (1) is provided with three recesses (101), the position, diameter and spacing of the three recesses (101) being matched with the three drill rods of the triaxial mixing pile machine.

3. The limiting component for the verticality correction device of a triaxial mixing pile drill rod according to claim 1, characterized in that: The thrust transmission device is disposed on the inner side of the two limiting member bodies (1) arranged opposite to each other.

4. The limiting component for the verticality correction device of a triaxial mixing pile drill rod according to claim 1, characterized in that: The rolling element receiving portion (3) is an arc-shaped groove extending circumferentially along the concave portion (101).

5. The limiting member for the verticality correction device of the drill rod of a triaxial mixing pile according to claim 4, characterized in that: The number of the rolling elements (2) is multiple, and the multiple rolling elements (2) are evenly distributed along the arc-shaped groove.

6. The limiting member for the verticality correction device of a triaxial mixing pile drill rod according to claim 1, characterized in that: The contact member (4) has an L-shaped cross section, including a connecting wall (401) connected to the outer wall of the limiting member body (1) and a contact wall (402) arranged opposite to the outside of the rolling element receiving part (3). The arc shape of the contact wall (402) is consistent with the arc shape of the rolling element receiving part (3). The outer arc surface of the contact wall (402) close to the rolling element receiving part (3) and the inner arc bottom surface of the rolling element receiving part (3) cooperate to form an arc track. The rolling element (2) is constrained in the arc track and can roll along the arc track. The inner arc surface of the contact wall (402) away from the rolling element receiving part (3) is in contact with the outer surface of the drill rod to disperse the concentrated load transmitted by the rolling element (2) into a surface load acting on the outer surface of the drill rod.

7. The limiting member for the verticality correction device of a triaxial mixing pile drill rod according to claim 1, characterized in that: It also includes a baffle (6) configured to be inserted into or removed from the rolling element receiving portion (3) to block or release the rolling element (2).

8. The limiting member for the verticality correction device of a triaxial mixing pile drill rod according to claim 7, characterized in that: It also includes a baffle (6) control mechanism, the baffle (6) control mechanism including The trigger (8) is movably disposed on the contact surface opposite to the limiting member body (1); The reset element (9) acts on the trigger element (8) to provide a force to reset the trigger element (8); A rotating component (5) is rotatably disposed within the limiting component body (1); The first transmission mechanism has one end linked to the trigger (8) and the other end linked to the rotating member (5), and is used to convert the linear motion of the trigger (8) into the rotational motion of the rotating member (5). The second transmission mechanism is linked at one end to the baffle (6) and at the other end to the rotating part (5), and is used to convert the rotational motion of the rotating part (5) into the linear motion of the baffle (6). When the two limiting member bodies (1) come close to each other, the contact surfaces of the two limiting member bodies (1) press the trigger (8), the trigger (8) drives the rotating member (5) to rotate through the first transmission mechanism, and the rotating member (5) then drives the baffle (6) through the second transmission mechanism, so that the baffle (6) exits the rolling element receiving part (3). When the two limiting member bodies (1) move away from each other, the trigger member (8) is reset under the action of the reset member (9), and the baffle (6) is driven to re-insert into the rolling element receiving part (3) through the first transmission mechanism and the second transmission mechanism in sequence to block the rolling element (2).

9. The limiting member for the verticality correction device of a triaxial mixing pile drill rod according to claim 8, characterized in that: The first transmission mechanism includes a push rod (7) fixedly connected to the trigger (8), and a first connecting rod (10) connecting the push rod (7) and the rotating member (5). One end of the first connecting rod (10) is hinged to the push rod (7), and the other end is hinged to the rotating member (5). The second transmission mechanism is a second connecting rod (11) connecting the rotating member (5) and the baffle (6). One end of the second connecting rod (11) is hinged to the rotating member (5), and the other end is hinged to the baffle (6).

10. The limiting member for the verticality correction device of a triaxial mixing pile drill rod according to any one of claims 1-9, characterized in that: The two limiting bodies (1) are driven by the driving device to move closer or further apart to clamp or release the drill rod.

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