Self-drilling hollow grouting anchor rod for soil nailing wall

Abstract

The utility model discloses a hollow grouting anchor rod of self drilling for soil nailing wall belongs to soil nailing wall support technical field. Anchor rod includes drill bit, hollow pole, lower connecting mouth and with the detachable connection of lower connecting mouth fixed mechanism and docking mechanism. Docking mechanism includes fixed lock column and by spring no. 2 drive's, retractable sliding lock column, and sliding lock column inserts into the calibration port of lower connecting mouth first, and fixed lock column realizes guiding centering for the entry. Fixed mechanism includes the outer sliding block of sliding setting on top connector, movable lock ball and spring no. 1, and outer sliding block extrudes movable lock ball through the annular slope of its inner wall. The utility model discloses the composite connection of pilot calibration and ball type quick locking, has solved the problem of anchor rod thread connection alignment difficult, long time consumption, poor reliability in the prior art, has the beneficial effect such as convenient operation, high installation efficiency, locking firm and reliable.

Description

Technical Field

[0001] This utility model relates to the field of soil nailing wall support technology, and in particular to a self-drilling hollow grouting anchor for soil nailing walls. Background Technology

[0002] Self-drilling hollow grouting anchors, as a type of geotechnical anchoring component that integrates drilling, grouting, and anchoring functions, have been widely used in geotechnical engineering projects such as soil nailing wall slope protection and foundation pit reinforcement. They combine the drilling and anchor installation processes into one, significantly simplifying the construction process and improving project efficiency.

[0003] In actual construction, the anchor bolt needs to be connected to the power head of the drilling rig to transmit the torque and axial pressure required for drilling. Currently, the industry commonly uses a threaded connection method, where mating threads are machined on the tail end of the anchor bolt and the connecting sleeve of the power head, and the connection is achieved through rotational engagement. This connection method has a simple structure and can provide a reliable connection under ideal conditions.

[0004] However, the construction site for soil nailing walls is typically a harsh environment, filled with mud, sand, stone chips, and grout overflowing from the grouting process. These contaminants easily adhere to and penetrate the delicate threaded structure, leading to difficulties in alignment, thread jamming, or even seizing during connection. Operators often need to spend a significant amount of time cleaning and aligning, severely impacting the installation efficiency of individual anchor bolts. Furthermore, frequent disassembly and high-torque drilling operations can easily cause wear on the threads themselves, eventually leading to increased connection gaps, decreased reliability, and safety hazards.

[0005] Therefore, this utility model proposes a self-drilling hollow grouting anchor for soil nailing walls to overcome the shortcomings of the prior art. Utility Model Content

[0006] In view of the problems of cumbersome connection operation, difficult alignment, low connection efficiency and insufficient reliability of self-drilling hollow grouting anchor rods used for soil nailing walls in the prior art, this utility model aims to provide a self-drilling hollow grouting anchor rod for soil nailing walls with an improved structure that can effectively solve the above problems.

[0007] This utility model provides a self-drilling hollow grouting anchor for soil nailing walls, comprising: a drill bit, a hollow rod, a lower connecting port; and a fixing mechanism and a docking mechanism.

[0008] The fixing mechanism includes a top connector, an outer sliding block, a movable locking ball, and a spring; the docking mechanism includes a fixed locking post, a sliding locking post, a sliding piece, a limit ring, and a spring.

[0009] The inner wall of the outer sliding block is provided with an annular inclined surface; the outer peripheral wall of the lower connection port is provided with an inner groove for cooperating with the movable locking ball; the top connector is slidably connected to a sliding locking post, and a sliding piece is fixedly connected to the bottom end of the sliding locking post; the limiting ring is fixed on the fixed locking post, and the second spring is disposed between the sliding piece and the limiting ring.

[0010] Furthermore, the fixing mechanism and the docking mechanism together constitute a detachable connecting assembly, which can be quickly docked with the lower connecting port by plugging and unplugging; the outer sliding block is slidably fitted on the top connector and works together with the spring to drive the movable locking ball through the inner groove of its inner wall to achieve radial locking and releasing; the sliding locking pin is extended and retracted under the drive of the spring to achieve pilot calibration with the lower connecting port.

[0011] Preferably, the inner wall of the lower connection port is provided with a receiving component, the receiving component including a main fixing port for inserting and engaging with the fixed locking pin and a calibration port for guiding the sliding locking pin.

[0012] Preferably, the outer contour of the sliding locking pin and the inner contour of the calibration port are in a circular fit structure to transmit torque.

[0013] Preferably, the spring is disposed on the outer periphery of the top connector and abuts against the outer sliding block and the flange formed on the top connector.

[0014] Preferably, the sliding locking pin passes through the limiting ring and can slide within it.

[0015] Preferably, the outer sliding block presses the movable locking ball through its annular inclined surface, causing the movable locking ball to move radially along the inner groove and engage therein.

[0016] Preferably, the hollow rod is a through tubular structure, and both the fixing mechanism and the docking mechanism have a grouting channel connected to the hollow rod at their center.

[0017] Preferably, the inlet of the calibration port is provided with a guide chamfer.

[0018] This utility model has the following beneficial effects: 1. This utility model, by setting up a docking mechanism consisting of a sliding locking pin and a calibration port, and a fixing mechanism consisting of an outer sliding block, a movable locking ball and a spring, together form a plug-in quick connection and locking solution, which solves the problems of difficult alignment, time-consuming connection and low construction efficiency caused by the use of threaded connections for anchor rods in the prior art. It achieves the technical effect of greatly improving the speed of anchor rod installation and disassembly, significantly shortening the operation time of a single anchor rod, and thus improving the overall construction efficiency.

[0019] 2. This utility model, by setting a sliding locking post driven by a spring and capable of extension and retraction, allows it to enter the calibration port inside the lower connection port before the fixed locking post of the main body during docking. This solves the problem in the prior art where the main load-bearing structure is easily impacted, worn, or even damaged during connection due to rough alignment. It achieves the purpose of automatic guidance for alignment, buffering initial contact, and protecting the core torsion transmission structure, thereby improving the reliability of the connection and the overall service life of the device.

[0020] 3. This utility model, by setting an outer sliding block driven by a spring, and using the inclined inner wall of the outer sliding block to squeeze multiple movable locking balls, makes the movable locking balls evenly locked into the annular locking groove on the outer wall of the lower connection port. This solves the problem of loosening or reduced connection strength that may occur in traditional threaded connections under the strong vibration and torque of drilling. It achieves the technical effects of large locking force, stable connection, and strong resistance to vibration and loosening, ensuring the stability and safety of power transmission during drilling. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the self-drilling hollow grouting anchor rod for soil nailing walls proposed in this utility model. Figure 2 This is a schematic diagram of the spring structure of the self-drilling hollow grouting anchor rod for soil nailing walls proposed in this utility model. Figure 3 This is a schematic diagram of the sliding locking column of the self-drilling hollow grouting anchor rod for soil nailing walls proposed in this utility model. Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the main fixing port of the self-drilling hollow grouting anchor rod for soil nailing walls proposed in this utility model.

[0022] Legend: 1. Drill bit; 2. Hollow rod; 3. Lower connector; 4. Fixing mechanism; 41. Top connector; 42. Movable locking ball; 43. Inner groove; 44. Spring 1; 45. Outer sliding block; 5. Docking mechanism; 51. Sliding locking pin; 52. Sliding plate; 53. Spring II; 54. Limiting ring; 55. Fixed locking pin; 56. Receiving component; 561. Main fixing port; 562. Calibration port. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model 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 utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0024] Example: Please refer to Figures 1 to 5 This utility model provides a self-drilling hollow grouting anchor for soil nailing walls, which aims to solve the problems of low connection efficiency and insufficient connection reliability of existing self-drilling anchors under harsh working conditions.

[0025] like Figure 1 As shown, the foundation frame of the self-drilling hollow grouting anchor for soil nailing walls includes a drill bit 1, a hollow rod 2 fixedly connected to the rear of the drill bit 1, and a lower connection port 3 fixedly connected to the end of the hollow rod 2 away from the drill bit 1; the anchor also includes a set of components that can be quickly and detachably connected to the lower connection port 3, the components including a fixing mechanism 4 and a docking mechanism 5.

[0026] Reference Figures 2 to 5 The fixing mechanism 4 includes a top connector 41 as the main body, an outer sliding block 45 slidably connected to the top connector 41, an annular inclined surface provided on the inner wall of the outer sliding block 45, and a movable locking ball 42 contained in the inner groove 43; in order to achieve locking, an inner groove 43 for cooperating with the movable locking ball 42 is correspondingly provided on the outer peripheral wall of the lower connection port 3; the fixing mechanism 4 also includes a spring 44, which is disposed between the outer sliding block 45 and the top connector 41, and is used to drive the outer sliding block 45 to reset.

[0027] The docking mechanism 5 includes a fixed locking post 55, a sliding locking post 51 is slidably connected inside the top connector 41, and a sliding piece 52 is fixedly connected to the bottom end of the sliding locking post 51; the docking mechanism 5 also includes a limiting ring 54 fixed on the fixed locking post 55, and a second spring 53 disposed between the sliding piece 52 and the limiting ring 54, the second spring 53 being used to drive the sliding locking post 51 to extend.

[0028] The inner wall of the lower connection port 3 is provided with a receiving component 56, which includes a main fixing port 561 for insertion and engagement with the fixed locking pin 55 and a calibration port 562 for guiding the sliding locking pin 51. During the docking process, the sliding locking pin 51, driven by the second spring 53, will first extend and enter the calibration port 562 to achieve initial alignment and buffering. Guided by the sliding locking pin 51, the fixed locking pin 55 can then slide precisely into the main fixing port 561. After the connection is in place, the inner bottom surface of the lower connection port 3 will push the sliding locking pin 51 backward, causing it to drive the sliding plate 52 to compress the spring. Spring 53; When locking is required, slide the outer sliding block 45 upward to compress the spring 44. This releases the pressure of the annular inclined surface of the outer sliding block 45 on the movable locking ball 42. The movable locking ball 42 can then retract radially inward within the inner groove 43. At this time, the lower connecting port 3 is fully inserted. Then, the outer sliding block 45 is released. The rebound force of the spring 44 will drive the outer sliding block 45 to reset. Its annular inclined surface will then squeeze the movable locking ball 42, causing the movable locking ball 42 to move radially outward along the inner groove 43 and finally lock into the groove on the outer peripheral wall of the lower connecting port 3, thereby achieving a stable and rapid locking.

[0029] Reference Figure 3 , Figure 4 and Figure 5 The fixed locking pin 55 in the docking mechanism 5 has a through hole along its central axis, and the sliding locking pin 51 is slidably fitted in the through hole; the rear end of the sliding locking pin 51 is fixedly connected to the sliding piece 52, and the sliding locking pin 51 passes through the limiting ring 54 fixed on the fixed locking pin 55; the second spring 53 is sleeved on the outer periphery of the sliding locking pin 51, and its two ends abut against the sliding piece 52 and the limiting ring 54 respectively. The structure together constitutes a telescopic guide unit driven by the spring.

[0030] A receiving component 56 is correspondingly provided on the inner wall of the lower connection port 3. The receiving component 56 includes a calibration port 562 adapted to the front end of the sliding locking pin 51 and a main fixing port 561 adapted to the shape of the fixed locking pin 55. A guide chamfer is provided at the entrance of the calibration port 562 to guide the sliding locking pin 51 into place.

[0031] During assembly and docking, the front end of the sliding locking pin 51, pushed out by spring 2 53, first enters the calibration port 562. This pilot sliding fit structure is used to provide initial alignment and guidance for the entire connection process. Under the guidance of the sliding locking pin 51, the outer contour of the fixing pin 55 then slides precisely into the inner contour of the main fixing port 561. The outer contour of the fixing pin 55 and the inner contour of the main fixing port 561 are designed as a non-circular fit structure, which realizes the reliable transmission of torque after docking. The outer contour of the fixing pin 55 and the inner contour of the main fixing port 561 adopt a non-circular fit structure, such as a hexagonal or spline structure.

[0032] Reference Figure 2Spring 44 is sleeved on the outer periphery of top connector 41, and its two ends abut against the outer sliding block 45 and the integrally formed flange on top connector 41, respectively.

[0033] Reference Figure 4 The sliding locking pin 51 passes through the central hole of the limiting ring 54, so that the sliding locking pin 51 can only slide back and forth relative to the limiting ring 54 along its axial direction. The annular inclined surface of the outer sliding block 45 contacts the outer surface of the movable locking ball 42. The structural configuration allows the axial movement of the outer sliding block 45 to be converted into a radial thrust on the movable locking ball 42, thereby driving the movable locking ball 42 to move radially along the inner groove 43 and engage in the annular engaging groove of the lower connecting port 3. The hollow rod 2 itself is a through tubular structure, and the center of the fixing mechanism 4 and the docking mechanism 5 are both provided with grouting channels that are connected to the internal channels of the hollow rod 2, thereby forming a continuous grout delivery path from the end of the drilling rig to the drill bit 1. A guide chamfer is provided at the entrance of the calibration port 562.

[0034] The working principle is as follows: During the connection and installation process, the connecting assembly consisting of the fixing mechanism 4 and the docking mechanism 5 is first aligned with the lower connecting port 3. At this time, under the preload of the second spring 53, the sliding locking pin 51 is in the extended state, and its front end will first contact and enter the calibration port 562 on the inner wall of the lower connecting port 3. Due to the guiding effect of the calibration port 562, the entire connecting assembly is initially aligned and calibrated. As it continues to advance, under the precise guidance of the sliding locking pin 51, the rear fixing pin 55 smoothly slides into the main fixing port 561. When the connecting assembly is fully inserted, the inner bottom surface of the lower connecting port 3 will press the sliding locking pin 51 in the opposite direction, causing it to drive the sliding piece 52 to move backward, thereby compressing the second spring 53 and storing energy for subsequent separation and reset.

[0035] After docking is completed, the locking operation is performed: the operator slides the outer sliding block 45 upward to compress the spring 44; at this time, the radial pressure of the annular inclined surface of the inner wall of the outer sliding block 45 on the movable locking ball 42 is released, and the movable locking ball 42 can retract inward in the inner groove 43 to make room for the lower connection port 3 to enter; when it is confirmed that the lower connection port 3 has been fully inserted, the outer sliding block 45 is released; under the action of the rebound force of the spring 44, the outer sliding block 45 automatically slides downward to reset, and its annular inclined surface will once again forcefully squeeze the movable locking ball 42, forcing it to move radially outward along the inner groove 43, and finally firmly jam into the groove of the outer peripheral wall of the lower connection port 3. Thus, the fast and stable mechanical locking is completed.

[0036] During drilling operations, the torque of the drilling rig is transmitted to the hollow rod 2 and the drill bit 1 through the non-circular mating structure between the fixed locking pin 55 and the main fixed port 561, thus achieving drilling. At the same time, the grout pumped by the grouting machine is directly delivered to the drill bit 1 through the through grouting channel, via the fixing mechanism 4, the docking mechanism 5 and the hollow rod 2, thus achieving synchronous operation of drilling and grouting.

[0037] When disassembly is required, simply slide the outer sliding block 45 upwards again to release the lock on the movable locking ball 42, and the connecting component can be quickly pulled out. After separation, the compressed spring 53 will release energy instantly, pushing the sliding plate 52 and the sliding locking pin 51 to automatically extend and reset, preparing for the next connection. Through the synergistic effect of the docking mechanism 5 and the fixing mechanism 4, this utility model effectively solves the problems of time-consuming connection, difficult alignment, and poor reliability in the prior art.

Claims

1. A self-drilling hollow grouting anchor for soil nailing walls, comprising: The drill bit (1), the hollow rod (2) fixedly connected to the rear end of the drill bit (1), and the lower connection port (3) fixedly connected to the end of the hollow rod (2) away from the drill bit (1). The anchor rod is characterized in that it further includes a fixing mechanism (4) and a docking mechanism (5) for detachable connection with the lower connection port (3). The fixing mechanism (4) includes a top connector (41), on which an outer sliding block (45) is slidably connected. The inner wall of the outer sliding block (45) is provided with an annular inclined surface. The top connector (41) contains a movable locking ball (42). The lower connection port (3) has an inner groove (43) on its outer peripheral wall for cooperating with the movable locking ball (42). The fixing mechanism (4) also includes a spring (44) disposed between the outer sliding block (45) and the top connector (41). The docking mechanism (5) includes a fixed locking post (55), which is fixed to the bottom end of the top connector (41). The top connector (41) is slidably connected to a sliding locking post (51), and a sliding piece (52) is fixedly connected to the rear end of the sliding locking post (51). The docking mechanism (5) also includes a limiting ring (54) fixed on the sliding locking post (51) and a second spring (53) disposed between the sliding piece (52) and the limiting ring (54).

2. The self-drilling hollow grouting anchor for soil nailing walls according to claim 1, characterized in that, The inner wall of the lower connection port (3) is provided with a receiving component (56), which includes a main fixing port (561) for inserting and cooperating with the fixed locking pin (55) and a calibration port (562) for guiding the sliding locking pin (51).

3. The self-drilling hollow grouting anchor for soil nailing walls according to claim 2, characterized in that, The outer contour of the sliding locking pin (51) and the inner contour of the calibration port (562) are in a circular fit structure to transmit torque.

4. The self-drilling hollow grouting anchor for soil nailing walls according to claim 1, characterized in that, The spring (44) is sleeved on the outer periphery of the top connector (41) and abuts against the outer sliding block (45) and the flange formed on the top connector (41).

5. The self-drilling hollow grouting anchor for soil nailing walls according to claim 1, characterized in that, The sliding locking pin (51) passes through the limiting ring (54) and can slide within it.

6. The self-drilling hollow grouting anchor for soil nailing walls according to claim 1, characterized in that, The outer sliding block (45) presses the movable locking ball (42) through its annular inclined surface, causing the movable locking ball (42) to move radially along the inner groove (43) and be locked therein.

7. The self-drilling hollow grouting anchor for soil nailing walls according to claim 1, characterized in that, The hollow rod (2) is a through tubular structure, and the center of both the fixing mechanism (4) and the docking mechanism (5) is provided with a grouting channel connected to the hollow rod (2).

8. The self-drilling hollow grouting anchor for soil nailing walls according to claim 2, characterized in that, The calibration port (562) has a guide chamfer at its entrance.

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