Segmented expansion anchor with elastic support anchoring structure

Abstract

The utility model relates to the technical field of rock and earth anchoring equipment, disclose a segmented type expansion anchor rod with elastic support anchoring structure, including the pole body, the pole body includes the coaxial setting front section, connecting section and rear section in proper order, the front end fixedly connected with the conical head of front section, the front section outer cover is equipped with the expansion pipe, when using this device, through the setting of elastic support rod articulation with anchoring ratchet, the elastic support rod retraction avoids when pushing into the pole body, avoid to hinder the hole, and its reset force lets anchoring ratchet always stick hole wall, when pulling the pole body, anchoring ratchet and hole wall produce wedge tight effect, lock expansion pipe, ensure that the pulling force is all applied to conical head, push expansion sheet radial expansion stick hole wall. Meanwhile, the sealing cone sleeve of rear section, bearing pad and lock nut cooperate, both seal and prevent impurities, and also disperse pressure, strong tail fixed, greatly improve anchoring strength and resistance to pullout, guarantee rock mass support safety.

Description

Technical Field

[0001] This utility model relates to the field of geotechnical anchoring equipment technology, specifically a segmented expansion anchor with an elastic support anchoring structure. Background Technology

[0002] In the field of geotechnical anchoring engineering, anchor bolts are an important support component, and their performance directly affects engineering safety. Traditional anchor bolts typically rely on a mechanical expansion device at the front end or full-length bonding to provide anchoring force. However, in actual construction, complex geological conditions often lead to irregular borehole diameters or local over-excavation, making traditional integral expansion mechanisms prone to slippage under tension, failing to expand effectively, and resulting in initial anchoring failure. Furthermore, the fixed length of traditional integral anchor bolts cannot flexibly adapt to varying borehole depths, increasing storage and transportation costs and revealing limitations such as poor adaptability and low construction efficiency under complex working conditions.

[0003] To address the aforementioned issues, this application proposes a segmented expansion anchor with an elastic support and anchoring structure. Utility Model Content

[0004] The purpose of this invention is to provide a segmented expansion anchor with an elastic support and anchoring structure to solve the problems mentioned in the background art, such as unreliable anchoring in ultra-large or irregular boreholes and low adaptability and construction efficiency due to the non-adjustable length of the anchor.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a segmented expansion anchor rod with an elastic support and anchoring structure, comprising a rod body, wherein the rod body sequentially comprises a front section, a connecting section, and a rear section arranged coaxially, the front end of the front section is fixedly connected to a conical head, and the front section is sleeved with an expansion tube; the front end of the expansion tube has multiple sets of radially expandable expansion plates distributed circumferentially, and the outer wall of the expansion tube is radially provided with multiple anchoring ratchet bars inclined along the axial direction of the rod body; the bottom of the anchoring ratchet bars is connected to the outer wall of the expansion tube by an elastic support rod.

[0006] Preferably, the conical head has a spindle-shaped structure, with its front end used to guide the rod into the borehole and its rear end used to squeeze the expansion plate to cause it to expand radially when the rod is pulled outward.

[0007] Preferably, the anchoring ratchet has its lower end near the conical head as the lower end, and is hinged to the outer wall of the expansion tube through the first U-shaped connector, and extends upward inclined towards the entrance of the anchor rod; the two ends of the elastic support rod are respectively hinged to the bottom of the anchoring ratchet and the outer wall of the expansion tube.

[0008] Preferably, the upper end of the elastic support rod is hinged to the middle position of the bottom of the anchoring ratchet, and its lower end is hinged to the outer wall of the expansion tube through a second U-shaped connector.

[0009] Preferably, the outer walls of the front section, connecting section and rear section are all provided with external threaded edges; adjacent sections of the rod body are detachably fixedly connected by a connecting assembly.

[0010] Preferably, the connecting assembly includes a male connector, a female connector, and a connecting sleeve; the male connector is fixedly disposed at the end of one section of the pole, and the female connector is fixedly disposed at the end of an adjacent section of the pole.

[0011] Preferably, both the male and female connectors are rod-shaped structures with a semi-circular cross-section; the outer walls of both the male and female connectors are provided with external threads, and the inner wall of the connecting sleeve is provided with internal threads that match the external threads. The male and female connectors are connected and locked by screwing the connecting sleeve.

[0012] Preferably, the outer wall of the rear section is sequentially fitted with a sealing cone sleeve, a bearing pad, and a locking nut; the sealing cone sleeve is located between the bearing pad and the outer wall of the rod body.

[0013] Compared with the prior art, the beneficial effects of this utility model are: This invention features an anchoring ratchet hinged to an elastic support rod. When the rod is pushed in, the elastic support rod contracts to avoid obstructing entry into the hole, and its restoring force ensures the anchoring ratchet remains against the hole wall. When the rod is pulled, the anchoring ratchet wedges against the hole wall, locking the expansion tube and ensuring that the pulling force is fully applied to the conical head, pushing the expansion plate to expand radially and adhere to the hole wall. Simultaneously, the sealing cone sleeve, bearing pad, and locking nut at the rear section work together to seal against impurities, distribute pressure, and secure the tail section, significantly improving anchoring strength and pull-out resistance, thus ensuring the safety of rock mass support.

[0014] This utility model features a through-rod consisting of a front section, a connecting section, and a rear section. It uses male and female connectors and connecting sleeves in conjunction with the connecting components for quick and easy threaded connection and locking, simplifying assembly and disassembly. External threaded edges on each section enhance the connection strength with the connecting components, preventing breakage under stress. The connecting sections can be added or removed according to drilling depth, flexibly adjusting the rod length without the need for a custom-made rod, reducing transportation and storage costs, improving adaptability to different scenarios, shortening construction preparation time, and increasing efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of a segmented expansion anchor rod with an elastic support and anchoring structure according to the present invention. Figure 2 This is a schematic diagram of the expansion tube in a segmented expansion anchor rod with an elastic support and anchoring structure according to the present invention. Figure 3 This is an enlarged structural schematic diagram of A in a segmented expansion anchor rod with an elastic support and anchoring structure according to this utility model. Figure 4 This is a schematic diagram of the internal structure of the elastic support rod in a segmented expansion anchor rod with an elastic support anchoring structure according to the present invention. Figure 5 This is an exploded structural diagram of a segmented expansion anchor rod with an elastic support and anchoring structure according to the present invention. In the diagram: 1. Rod body; 2. Conical head; 3. Expansion tube; 4. Expansion plate; 5. Anchoring ratchet; 6. First U-shaped connector; 7. Elastic support rod; 8. Second U-shaped connector; 9. Male connector; 10. Female connector; 11. Connecting sleeve; 12. External threaded edge; 13. Sealing cone sleeve; 14. Bearing pad; 15. Locking nut; 16. Connecting assembly; 110. Front section; 120. Connecting section; 130. Rear section. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0017] Please see Figures 1-5 This utility model provides a technical solution: a segmented expansion anchor rod with an elastic support and anchoring structure, including a rod body 1, which includes a front section 110, a connecting section 120 and a rear section 130 arranged coaxially. A conical head 2 is fixedly connected to the front end of the front section 110, and an expansion tube 3 is sleeved on the front section 110. Multiple sets of radially expandable expansion plates 4 are distributed circumferentially at the front end of the expansion tube 3, and multiple anchoring ratchet bars 5 are radially arranged on the outer wall of the expansion tube 3, which are inclined along the axial direction of the rod body 1. The bottom of the anchoring ratchet bars 5 is connected to the outer wall of the expansion tube 3 by an elastic support rod 7. The rod body 1 forms an overall load-bearing foundation through the coaxial arrangement of the front section 110, the connecting section 120, and the rear section 130. The tapered head 2 at the front end of the front section 110 provides guidance for the anchor rod to enter the hole. The expansion tube 3 outside the front section 110 serves as the carrier of the expansion mechanism. The expansion plate 4 at its front end has radial expansion capability. The anchoring ratchet 5 on the outer wall of the expansion tube 3 is elastically connected to the expansion tube 3 through the elastic support rod 7. When the rod body 1 is subjected to tension, the inclined anchoring ratchet 5 produces a wedging effect with the borehole wall, forming a huge frictional resistance that locks the expansion tube 3 in the hole, preventing the expansion tube 3 from moving synchronously with the rod body 1. This allows all the tension to be applied to the tapered head 2, which squeezes the expansion plate 4 to produce radial expansion, ultimately achieving a firm anchor.

[0018] The conical head 2 has a spindle-shaped structure. Its front end guides the rod body 1 into the borehole, while its rear end compresses the expansion plate 4 to cause it to expand radially when the rod body 1 is pulled outward. The streamlined structure of the spindle-shaped conical head 2 reduces friction with the borehole wall during anchor installation, smoothly guiding the rod body 1 into the borehole and ensuring precise anchor placement. When the rod body 1 is subjected to outward tension, the conical surface at the rear end of the conical head 2 contacts the inner wall of the expansion plate 4 at the front end of the expansion tube 3. As the tension increases, the compressive force of the conical head 2 on the expansion plate 4 gradually increases, forcing the expansion plate 4 to expand radially and tightly adhere to the borehole wall, further enhancing the anchoring effect.

[0019] The anchoring ratchet 5 has its lower end near the conical head 2 as its lower end, and is hinged to the outer wall of the expansion tube 3 via the first U-shaped connector 6, extending upwards at an angle towards the anchor rod inlet. The two ends of the elastic support rod 7 are hinged to the bottom of the anchoring ratchet 5 and the outer wall of the expansion tube 3, respectively. The anchoring ratchet 5, with its lower end near the conical head 2 as its lower end, is angled towards the inside of the hole, and its bottom is hinged to the outer wall of the expansion tube 3 via the elastic support rod 7, forming an elastically adjustable contact structure. When the rod 1 is pushed into the borehole, the anchoring ratchet 5 experiences pressure towards the expansion tube 3 due to contact with the borehole wall. This pressure causes the elastic support rod 7 to contract and deform, providing space for the anchoring ratchet 5 to rotate towards the expansion tube 3, preventing the anchoring ratchet 5 from obstructing the advancement of the rod 1 and ensuring that the rod 1 can smoothly enter the borehole. Simultaneously, the elastic support rod 7 continuously acts on the anchoring ratchet 5 with its own elastic restoring force, ensuring that the end of the anchoring ratchet 5 facing the anchor rod inlet (away from the conical head 2) remains firmly in contact with the borehole. The rod 1 maintains a stable pre-contact state with the borehole wall. When the rod 1 is pulled outward, the rod 1 causes the expansion tube 3 to tend to move towards the borehole opening. At this time, the end of the anchoring ratchet 5 facing the anchor rod inlet is subjected to the reaction force of the borehole wall due to its close contact with the borehole wall. This reaction force causes the anchoring ratchet 5 to rotate further around the hinge point and be tightly locked on the borehole wall, forming a reliable locking effect and preventing the expansion tube 3 from moving synchronously with the rod 1. In addition, the elastic characteristics of the elastic support rod 7, in combination with the hinge structure, can adapt to boreholes of different diameters, ensuring that the action of the anchoring ratchet 5 is stable and effective during the pushing and pulling process, providing the necessary conditions for the subsequent radial expansion of the expansion plate 4 by the conical head 2 to achieve firm anchoring.

[0020] The upper end of the elastic support rod 7 is hinged to the middle position of the bottom of the anchoring ratchet 5, and its lower end is hinged to the outer wall of the expansion tube 3 through the second U-shaped connector 8. The upper end of the elastic support rod 7 is hinged to the middle position of the bottom of the anchoring ratchet 5, so that the anchoring ratchet 5 can transmit pressure evenly when under force, avoiding deviation caused by uneven force; its lower end is hinged to the outer wall of the expansion tube 3 through the second U-shaped connector 8, which enhances the stability of the connection between the elastic support rod 7 and the expansion tube 3; when the anchoring ratchet 5 produces a wedging effect with the borehole wall, this symmetrical hinge structure can ensure that the elastic support rod 7 provides stable support force, maintain the tilt angle of the anchoring ratchet 5 and the contact state with the borehole wall, ensure that the expansion tube 3 is locked reliably, and provide stable conditions for the conical head 2 to compress the expansion plate 4.

[0021] like Figure 1 and Figure 5 As shown, the outer walls of the front section 110, connecting section 120, and rear section 130 are all provided with external threaded ridges 12; adjacent sections of the rod body 1 are detachably fixedly connected by connecting components 16. The external threaded ridges 12 on the outer walls of the front section 110, connecting section 120, and rear section 130 provide a threaded mating foundation for the connection between each section and the installation of subsequent components; adjacent rod bodies 1 are detachably fixed by connecting components 16. This segmented structure facilitates the transportation and storage of the anchor rod, and the overall length of the rod body 1 can be flexibly adjusted according to the drilling depth; the setting of external threaded ridges 12 can enhance the connection strength between the rod body 1 and the connecting components 16, ensure that the tensile force is effectively transmitted between each section of the rod body 1, avoid breakage at the connection, and ensure the overall stability of the anchoring mechanism.

[0022] The connecting assembly 16 includes a male connector 9, a female connector 10, and a connecting sleeve 11. The male connector 9 is fixedly installed at the end of one section of the pole body 1, and the female connector 10 is fixedly installed at the end of an adjacent section of the pole body 1. The connecting assembly 16 is fixed to the ends of two adjacent sections of the pole body 1 through the male connector 9 and the female connector 10, respectively, realizing the docking foundation for the segmented connection of the pole body 1. When it is necessary to connect the pole body 1, the male connector 9 and the female connector 10 are aligned and fitted together, and then the two are fitted and fixed through the connecting sleeve 11, so that the adjacent pole body 1 forms a whole. This structure clearly defines the connection method of the segmented pole body 1, ensures the reliability of the connection and the convenience of disassembly and assembly, and ensures that the tensile force can be effectively transmitted between the pole bodies 1 through the male connector 9 and the female connector 10.

[0023] Both the male connector 9 and the female connector 10 are rod-shaped structures with a semi-circular cross-section. The outer walls of both the male connector 9 and the female connector 10 are provided with external threads, and the inner wall of the connecting sleeve 11 is provided with internal threads that match the external threads. The male connector 9 and the female connector 10 are connected and locked by screwing on the connecting sleeve 11. The semi-circular cross-section of the male connector 9 and the female connector 10 allows them to be assembled into a complete cylinder after connection, matching the shape of the rod body 1 and ensuring the coaxiality of the rod body 1 after connection, thus avoiding eccentric loads under stress. The external threads on the outer walls of the male connector 9 and the female connector 10 match the internal threads on the inner wall of the connecting sleeve 11. By screwing on the connecting sleeve 11, the connected male connector 9 and the female connector 10 can be tightly locked, enhancing the tensile strength of the connection. This ensures stable transmission of tensile force between different sections of the rod body 1, providing structural support for the normal operation of the anchoring mechanism.

[0024] The outer wall of the rear section 130 is sequentially fitted with a sealing cone sleeve 13, a bearing pad 14, and a locking nut 15; the sealing cone sleeve 13 is located between the bearing pad 14 and the outer wall of the rod body 1. The sealing cone sleeve 13, the bearing pad 14, and the locking nut 15 sequentially fitted on the outer wall of the rear section 130 constitute the tail fixing and sealing structure of the anchor rod; when the anchor rod body is installed in place, tightening the locking nut 15 will generate axial pressure on the bearing pad 14, and the bearing pad 14 will transfer the pressure to the sealing cone sleeve 13, causing the sealing cone sleeve 13 to deform and tightly fit against the borehole wall and the outer wall of the rod body 1, thereby sealing the borehole inlet and preventing impurities from entering the hole and affecting the anchoring effect; at the same time, the bearing pad 14 can evenly distribute the pressure of the locking nut 15 to the surrounding rock mass of the borehole, enhancing the stability of the tail fixing, and working with the front expansion mechanism to achieve a firm overall anchoring.

[0025] Working principle:

[0026] First, assemble the rod body 1 using the connecting assembly 16 according to the drilling depth. Align and fit the male connector 9 of the front section 110, connecting section 120, and rear section 130 with the female connector 10, and screw on the connecting sleeve 11 to lock the semi-circular joint using the threaded connection, forming a coaxial whole; the external thread 12 enhances the connection strength and ensures stable transmission of tensile force. At the same time, install the sealing cone sleeve 13, the bearing pad 14, and the lock nut 15 sequentially on the rear section 130.

[0027] Align the assembled anchor rod with the borehole, and the spindle-shaped conical head 2 guides the rod body 1 smoothly into the hole. When pushed in, the anchoring ratchet 5 is subjected to the pressure of the borehole wall, which causes the elastic support rod 7 to contract, allowing the ratchet to rotate and avoiding obstruction of the advance; the restoring force of the elastic support rod 7 keeps the end of the ratchet facing the hole opening always in close contact with the hole wall, maintaining the pre-contact state.

[0028] Pulling the rod 1 outward causes the end of the anchoring ratchet 5 facing the hole to rotate around the hinge point and lock into the hole wall due to the reaction force from the hole wall. This wedge effect locks the expansion tube 3, preventing it from moving synchronously with the rod 1. The elastic support rod 7 provides stable support through the second U-shaped connector 8, ensuring that the ratchet is subjected to uniform force without tilting.

[0029] All the tension is applied to the conical head 2, whose rear conical surface squeezes the expansion plate 4 of the expansion tube 3, causing it to expand radially and fit tightly against the hole wall. Finally, the locking nut 15 is tightened, and the bearing pad 14 squeezes and deforms the sealing conical sleeve 13 to seal the orifice. The bearing pad 14 disperses the pressure and enhances the stability of the tail end, achieving a firm anchoring in conjunction with the front expansion mechanism.

[0030] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

Claims

1. A segmented expansion anchor bolt with an elastic support and anchoring structure, comprising a bolt body (1), characterized in that: The rod body (1) includes a front section (110), a connecting section (120) and a rear section (130) arranged coaxially. A conical head (2) is fixedly connected to the front end of the front section (110), and an expansion tube (3) is sleeved on the front section (110). Multiple sets of radially expandable expansion plates (4) are distributed circumferentially at the front end of the expansion tube (3). Multiple anchoring ratchet bars (5) inclined along the axial direction of the rod body (1) are arranged radially on the outer wall of the expansion tube (3). The bottom of the anchoring ratchet bar (5) is connected to the outer wall of the expansion tube (3) by an elastic support rod (7).

2. A segmented expansion anchor bolt with an elastic support and anchoring structure according to claim 1, characterized in that: The conical head (2) has a spindle-shaped structure. Its front end is used to guide the rod (1) into the borehole, and its rear end is used to squeeze the expansion plate (4) to make it expand radially when the rod (1) is pulled outward.

3. A segmented expansion anchor bolt with an elastic support and anchoring structure according to claim 2, characterized in that: The anchoring ratchet (5) has its lower end near the conical head (2) as the lower end, and is hinged to the outer wall of the expansion tube (3) through the first U-shaped connector (6), and extends upward in the direction of the anchor rod entrance; the two ends of the elastic support rod (7) are respectively hinged to the bottom of the anchoring ratchet (5) and the outer wall of the expansion tube (3).

4. A segmented expansion anchor bolt with an elastic support and anchoring structure according to claim 3, characterized in that: The upper end of the elastic support rod (7) is hinged to the middle position of the bottom of the anchoring ratchet (5), and its lower end is hinged to the outer wall of the expansion tube (3) through the second U-shaped connector (8).

5. A segmented expansion anchor bolt with an elastic support and anchoring structure according to claim 1, characterized in that: The outer walls of the front section (110), the connecting section (120) and the rear section (130) are all provided with external threaded edges (12); the adjacent sections of the rod body (1) are detachably fixedly connected by a connecting assembly (16).

6. A segmented expansion anchor bolt with an elastic support and anchoring structure according to claim 5, characterized in that: The connecting assembly (16) includes a male connector (9), a female connector (10) and a connecting sleeve (11); the male connector (9) is fixedly installed at the end of a section of the rod (1), and the female connector (10) is fixedly installed at the end of an adjacent section of the rod (1).

7. A segmented expansion anchor bolt with an elastic support and anchoring structure according to claim 6, characterized in that: Both the male connector (9) and the female connector (10) are rod-shaped structures with a semi-circular cross-section; the outer walls of both the male connector (9) and the female connector (10) are provided with external threads, and the inner wall of the connecting sleeve (11) is provided with internal threads that match the external threads. The male connector (9) and the female connector (10) are connected and locked by screwing the connecting sleeve (11).

8. A segmented expansion anchor bolt with an elastic support and anchoring structure according to claim 1, characterized in that: The outer wall of the rear section (130) is sequentially fitted with a sealing cone sleeve (13), a bearing pad (14), and a locking nut (15); the sealing cone sleeve (13) is located between the bearing pad (14) and the outer wall of the rod body (1).

Images