A mine hollow grouting anchor rod capable of being lengthened
By designing an extendable hollow grouting anchor for mining, and utilizing telescopic connectors and an elastic bladder for expansion and sealing, the problems of insufficient length and grout overflow of traditional grouting anchors were solved, achieving deeper anchoring and better support effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANXI JINMEI GRP ZHAOZHUANG COAL IND CO LTD
- Filing Date
- 2025-08-07
- Publication Date
- 2026-07-07
AI Technical Summary
Traditional grouting anchors have limited length and low elongation, making them unable to stably anchor deeper into the plastic failure zone of the surrounding rock. They also lack sufficient support and are prone to grout overflow during grouting.
A mine-use extendable hollow grouting anchor rod was designed, including an extension rod and a connecting rod. They are connected by a connector and anchored to the rock mass using a telescopic connector. The elastic bladder at the rear end of the connecting rod expands and seals within the anchor hole to ensure grouting effect.
It achieves deeper anchoring, improves support capacity, and prevents grout overflow during grouting, thus enhancing the grouting effect.
Smart Images
Figure CN224469163U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of grouting anchor technology, and in particular to a mine-use extendable hollow grouting anchor. Background Technology
[0002] Rock bolt support can significantly improve the stability of surrounding rock and has obvious technical and economic advantages compared with traditional shed support. As a result, it has attracted much attention from the mining engineering community around the world and has been rapidly developed and widely used.
[0003] Currently, traditional grouting anchors have limited length and low elongation. In some deep areas of plastic failure in the surrounding rock, traditional grouting anchors cannot be anchored to the deep stable rock strata, thus failing to provide sufficient support and ensure the stability of the surrounding rock. Furthermore, during grouting, especially in upward grouting environments, traditional grouting anchors are prone to grout overflow under grouting pressure, making it impossible to guarantee the grouting effect.
[0004] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Utility Model Content
[0005] The purpose of this application is to provide a mine-use extendable hollow grouting anchor bolt to solve or alleviate the problems of traditional anchor bolts having low elongation, being unable to stably anchor deep into the plastic failure zone of the surrounding rock, failing to provide sufficient support force, and having poor grouting effect.
[0006] To achieve the above objectives, this application provides the following technical solution:
[0007] This application provides a mine-use extendable hollow grouting anchor bolt, comprising: an extension rod and a connecting rod. The extension rod is located at the deepest point of the anchor hole. The connecting rod is connected to the rear end of the extension rod via a connector. The connector is telescopic, and its contraction can generate an anchoring force with the surrounding rock mass. The rear end of the connecting rod tapers to accommodate an elastic bladder. When the elastic bladder is inside the anchor hole, squeezing the elastic bladder expands its periphery to exert pressure on the hole wall and seal it.
[0008] Preferably, the front end of the extension rod is threaded with a tapered grouting head, and the tip surface of the grouting head is provided with a first grout outlet hole.
[0009] Preferably, both the extension rod and the extension rod have spiral grooves throughout, and both the extension rod and the extension rod have a second slurry outlet hole within the spiral grooves.
[0010] Preferably, the connector includes: a telescopic part and a connecting part, wherein the telescopic part is a hollow column and the connecting part is distributed at both ends of the telescopic part;
[0011] The connecting part consists of a threaded section and an upsetting section. The threaded section extends into the hollow cavity of the corresponding extension rod, and the threaded section is threadedly fitted with the extension rod so that the upsetting section is connected to the corresponding extension rod or the extension rod.
[0012] Preferably, the diameter of the upset section is the same as the diameter of the extension rod or the extension extension rod.
[0013] Preferably, both ends of the telescopic part extend into the corresponding upsetting section, and the upsetting section is provided with space for the ends of the telescopic part to move axially.
[0014] Both ends of the telescopic part are provided with limiting plates to prevent the telescopic part from detaching from the upsetting section.
[0015] Preferably, the surface of the telescopic part is provided with a groove along the axial direction, and guide grooves are provided on both sides of the groove;
[0016] Both ends of the groove are provided with sliding pillars along its width direction, and the two ends of the sliding pillars extend into the corresponding guide grooves;
[0017] An anchor post is vertically installed in the center of the trench. One end of the anchor post penetrates the wall of the telescopic part and extends into its cavity. The other end of the anchor post is pointed and extends outward from the telescopic part.
[0018] Preferably, a pair of swing rods are provided between the outer end of the anchor and the two sliding columns in the trench;
[0019] One end of the swing arm is sleeved on the outside of the sliding column, and the other end of the swing arm is inclined away from the groove and hinged to the outer end of the anchor column.
[0020] Preferably, a pusher block protrudes into the groove at one end of the upsetting section facing the telescopic part, and the sliding column is pushed by the pusher block.
[0021] Preferably, the tapered section at the rear end of the extension rod is further fitted with an auxiliary pressure tube and a pressure ring, wherein the pressure ring is threadedly fitted with the tapered section so that rotating the pressure ring applies pressure to the auxiliary pressure tube, and the outer dimensions of the elastic bladder expand due to the compression of the auxiliary pressure tube to fit tightly against the wall of the anchor hole.
[0022] Compared with the closest prior art, the technical solution of this application has the following beneficial effects:
[0023] This application allows for the extension of grouting anchors, enabling deeper anchoring and ensuring they are anchored to stable rock strata, thus improving the support capacity of the grouting anchors. Furthermore, this application ensures that no grout overflow occurs at the grouting port during grouting, effectively improving the grouting effect. Attached Figure Description
[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. Wherein:
[0025] Figure 1 This is a schematic diagram of the front view of this application;
[0026] Figure 2 This is an overall schematic diagram of the extension rod and extension bar of this application;
[0027] Figure 3 This is a schematic diagram showing the unfolded structure of the connector in this application;
[0028] Figure 4 This is a schematic diagram of the overall structure of the telescopic part of this application.
[0029] In the diagram: 1. Extension rod; 2. Extending rod; 3. Elastic bladder; 4. Grouting head; 5. First grout outlet; 6. Spiral groove; 7. Second grout outlet; 8. Telescopic part; 9. Connecting part; 901. Threaded section; 902. Upsetting section; 10. Limiting plate; 11. Groove; 12. Sliding column; 13. Anchor column; 14. Swing rod; 15. Push block; 16. Auxiliary pressure pipe; 17. Pressure ring. Detailed Implementation
[0030] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present application without departing from the scope or spirit thereof. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present application encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.
[0031] In the following description, the terms "first / second / third" are used merely to distinguish similar objects and do not represent a specific order of objects. It is understood that "first / second / third" may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.
[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing embodiments of this disclosure only and is not intended to limit this disclosure.
[0033] In the description of this application, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and do not require that this application be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. The terms "connected," "linked," and "set up" used in this application should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; direct connections or indirect connections through intermediate components; wired connections, radio connections, or wireless communication signal connections. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.
[0034] This embodiment aims to provide a mine-use extendable hollow grouting anchor rod, whose main functions are to increase the anchorage length, ensure support capacity, and improve grouting effect.
[0035] Reference Figures 1-4 The anchor bolt mainly consists of an extension rod 1 and a connecting rod 2, both of which are hollow. The extension rod 1 faces downwards to be inserted into the deepest part of the anchor hole, while the connecting rod 2 faces upwards and is connected to the upper end of the extension rod 1 via a connector. A tapered grouting head 4 is threaded onto the lower end of the extension rod 1. The tip of the grouting head 4 has a first grout outlet 5 to allow the anchoring grout to be poured downwards to contact the stable rock layer. Both the extension rod 1 and the connecting rod 2 have spiral grooves 6 throughout their bodies, and a second grout outlet 7 is provided in the spiral grooves 6 of both the extension rod 1 and the connecting rod 2, so that the grout fills the surrounding rock layer while also filling the spiral grooves 6, thereby further enhancing the support capacity of the grouting anchor bolt.
[0036] The connector is telescopic, and its contraction creates an anchoring force with the surrounding rock mass. Specifically, the connector includes a telescopic part 8 and a connecting part 9. The telescopic part 8 is a hollow cylinder, and the connecting part 9 is located at both ends of the telescopic part 8. The connecting part 9 consists of a threaded section 901 and an upsetting section 902. The threaded section 901 and the upsetting section 902 are coaxially and integrally welded. The threaded section 901 extends into the hollow cavity of the corresponding extension rod 1. The end of the extension rod 1 has threads machined in its hollow cavity so that the threaded section 901 and the extension rod 1 are threadedly fitted. When the threaded section 901 is fully inserted into the hollow cavity of the extension rod 1, the upsetting section 902 and the corresponding extension rod... When extension rod 1 or extension rod 2 is in a docked state, the extension rod 1 and extension rod 2 are successfully connected, that is, the grouting anchor rod is lengthened. The diameter of the upsetting section 902 is the same as the diameter of extension rod 1 or extension rod 2 to enhance the smoothness of the grouting anchor rod entering the hole. Both ends of the telescopic part 8 extend into the corresponding upsetting section 902, and the upsetting section 902 is provided with space for the end of the telescopic part 8 to move axially. Both ends of the telescopic part 8 are welded with a limiting plate 10 in the middle. The limiting plate 10 restricts the telescopic part 8 from detaching from the upsetting section 902. The middle part of the limiting plate 10 is provided with a through hole corresponding to the hollow cavity of the telescopic part 8 to prevent the grout flow from being blocked.
[0037] The surface of the telescopic part 8 is provided with grooves 11 along the axial direction. The length of the grooves 11 is the same as that of the telescopic part 8. The grooves 11 are finally sealed by the limiting plate 10. Multiple grooves 11 are evenly distributed around the telescopic part 8. Guide grooves (not shown in the figure) are provided on both sides of the grooves 11 along the axial direction. Sliding columns 12 are provided at both ends of the grooves 11 along their width direction, i.e., laterally. The two ends of the sliding columns 12 extend into the corresponding guide grooves so that the sliding columns 12 slide along the guide grooves. An anchor column 13 is provided vertically in the center of each groove 11. One end of the anchor column 13, i.e., the inner end, penetrates the column wall of the telescopic part 8 and extends into its cavity, but does not reach the center of the cavity to avoid interference between multiple anchor columns 13. The other end of the anchor column 13, i.e., the outer end, is pointed and extends outward of the telescopic part 8. The anchor column 13 can also be set as a blade, with its blade direction consistent with the axial direction of the rod body, so that the anchor column 13 can cut into the rock strata more easily.
[0038] A pair of rocker arms 14 are provided between the outer end of the anchor 13 and the two sliding pins 12 in the trench 11. One end of the rocker arm 14 is sleeved outside one end of the sliding pin 12, and the other end of the rocker arm 14 is slightly inclined away from the trench 11 and hinged to the outer end of the anchor 13. In the trench 11, the hinged ends of the two lower rocker arms 14 are located between the hinged ends of the two upper rocker arms 14 to avoid mutual interference during their movement.
[0039] At the opening of the upsetting section 902 facing the telescopic part 8, there is a push block 15 protruding into each groove 11. The sliding column 12 is pushed by the push block 15. Specifically, when the upper end of the extension rod 2 is pressed, the two sliding columns 12 in the groove 11 will be stressed, and the limiting plates 10 at both ends of the telescopic part 8 will move axially inside the upsetting section 902. At this time, the tilt angle of the swing rod 14 in the groove 11 will increase, and the hinge end of the swing rod 14 will gradually pull the anchor column 13 out radially. The tip of the anchor column 13 will gradually extend towards the surrounding rock layer and finally insert into the rock layer for anchoring. In this state, the grouting anchor rod will not rotate under the positioning of the anchor column 13.
[0040] The upper end of the extension rod 2 tapers to sequentially mount the elastic bladder 3, auxiliary pressure tube 16, and pressure ring 17. The elastic bladder 3 is made of rubber and is located inside the anchor hole. By squeezing the elastic bladder 3, its outer periphery expands to exert pressure on the wall of the anchor hole and seal it. The pressure ring 17 has handles welded radially along its outer edge, one on each side. The pressure ring 17 is threaded onto the tapered section of the extension rod 2. Rotating the pressure ring 17 applies pressure to the auxiliary pressure tube 16. The outer periphery of the elastic bladder 3 expands due to the compression of the auxiliary pressure tube 16 to fit tightly against the wall of the anchor hole. The function of the auxiliary pressure tube 16 is to ensure that the pressure ring 17 is always outside the anchor hole, so that the worker can rotate the pressure ring 17 by the handle.
[0041] In use, first drill the anchor hole. The depth of the anchor hole depends on the actual site conditions. Connect the extension rod 1 and the extension rod 2 together using the connector. First, insert a thin support rod into the grouting pipe along the hollow cavity. The length of this thin support rod must be longer than the extended grouting anchor rod. The purpose is to ensure that the connector does not shrink during the process of the grouting anchor rod entering the anchor hole. It should be noted that before the connector shrinks, the tip of the anchor 13 will not contact the wall of the anchor hole. After the grouting anchor rod coincides with the anchor hole, remove the thin support rod and then squeeze the extension rod 2. Alternatively, you can strike the upper end of the extension rod 2 with a rubber hammer to anchor the anchor 13. The rod is inserted into the surrounding rock strata. Then, an elastic bladder 3, an auxiliary pressure tube 16, and a threaded pressure ring 17 are sequentially installed on the tapered section of the extension rod 2. At this time, the lower ends of the elastic bladder 3 and the auxiliary pressure tube 16 are inside the anchor hole, while the upper end of the auxiliary pressure tube 16 and the pressure ring 17 are outside the anchor hole. By rotating the pressure ring 17, pressure is applied to the auxiliary pressure tube 16. The elastic bladder 3 is squeezed by the auxiliary pressure tube 16, causing its outer periphery to expand radially, thus sealing the anchor hole. During the rotation of the pressure ring 17, the rotation of the grouting anchor rod is restricted by the anchoring action of the anchor column 13, so it will not affect the rotation of the pressure ring 17. Finally, grouting is performed through the upper cavity of the extension rod 2.
[0042] This embodiment allows for the extension of grouting anchors, enabling deeper anchoring and ensuring they are anchored to stable rock strata. This enhances the support capacity of the grouting anchors and prevents grout overflow at the grouting port during grouting, effectively improving the grouting effect.
[0043] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A mine-use extendable hollow grouting anchor bolt, characterized in that, include: An extension rod and a connecting rod are provided. The extension rod is located at the deepest part of the anchor hole. The connecting rod is connected to the rear end of the extension rod via a connector. The connector is telescopic, and its contraction can generate an anchoring force with the surrounding rock mass. The rear end of the extension rod tapers to accommodate an elastic bladder. When the elastic bladder is inside the anchor hole, it is squeezed to expand its periphery, thereby applying pressure to the hole wall and sealing it.
2. The mine-use extendable hollow grouting anchor bolt according to claim 1, characterized in that, The front end of the extension rod is threaded with a tapered grouting head, and the tip surface of the grouting head is provided with a first grout outlet hole.
3. The mine-use extendable hollow grouting anchor bolt according to claim 1, characterized in that, Both the extension rod and the extension rod have spiral grooves throughout, and a second slurry outlet hole is provided in the spiral grooves of both the extension rod and the extension rod.
4. The mine-use extendable hollow grouting anchor bolt according to claim 1, characterized in that, The connector includes: a telescopic part and a connecting part, wherein the telescopic part is a hollow column and the connecting part is distributed at both ends of the telescopic part; The connecting part consists of a threaded section and an upsetting section. The threaded section extends into the hollow cavity of the corresponding extension rod, and the threaded section is threadedly fitted with the extension rod so that the upsetting section is connected to the corresponding extension rod or the extension rod.
5. The mine-use extendable hollow grouting anchor bolt according to claim 4, characterized in that, The diameter of the upsetting section is the same as the diameter of the extension rod or the extension extension rod.
6. The mine-use extendable hollow grouting anchor bolt according to claim 4, characterized in that, Both ends of the telescopic part extend into the corresponding upsetting section, and the upsetting section is provided with space for the end of the telescopic part to move axially. Both ends of the telescopic part are provided with limiting plates to prevent the telescopic part from detaching from the upsetting section.
7. The mine-use extendable hollow grouting anchor bolt according to claim 6, characterized in that, The surface of the telescopic part is provided with a groove along the axial direction, and guide grooves are provided on both sides of the groove. Both ends of the groove are provided with sliding pillars along its width direction, and the two ends of the sliding pillars extend into the corresponding guide grooves; An anchor post is vertically installed in the center of the trench. One end of the anchor post penetrates the wall of the telescopic part and extends into its cavity. The other end of the anchor post is pointed and extends outward from the telescopic part.
8. The mine-use extendable hollow grouting anchor bolt according to claim 7, characterized in that, A pair of swing rods is provided between the outer end of the anchor and the two sliding columns in the trench; One end of the swing arm is sleeved on the outside of the sliding column, and the other end of the swing arm is inclined away from the groove and hinged to the outer end of the anchor column.
9. The mine-use extendable hollow grouting anchor bolt according to claim 8, characterized in that, A pusher block protrudes into the groove from one end of the upsetting section facing the telescopic part, and the sliding column is pushed by the pusher block.
10. The mine-use extendable hollow grouting anchor bolt according to claim 1, characterized in that, The tapering section at the rear end of the extension rod is also fitted with an auxiliary pressure tube and a pressure ring, wherein the pressure ring is threadedly fitted with the tapering section so that rotating the pressure ring applies pressure to the auxiliary pressure tube. The outer dimensions of the elastic bladder expand due to the compression of the auxiliary pressure tube to fit tightly against the wall of the anchor hole.