Double-layer pipe wall pipe seam anchor rod
By using a double-walled pipe-grooved anchor design, and by combining the outer and inner pipes with the water-guiding groove structure, the problem of reduced anchor friction under fractured and water-bearing conditions was solved, resulting in better support performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2026-04-10
AI Technical Summary
In conventional slotted bolts, when the surrounding rock is fractured and contains a lot of water, the minerals absorb water and expand, causing rock fragments to fall off. The mud flowing to the bolt body and the borehole wall greatly reduces the friction, increasing the risk of the bolt coming out.
The design incorporates a double-walled pipe-grooved anchor rod, utilizing the interlocking of the outer and inner pipes. Protrusions are added to the surface of the anchor rod to increase friction and interlocking force. Water is introduced into the anchor rod through a water channel and water holes, flowing out from the port, thus serving to guide and drain water.
It enhances the friction and interlocking force between the anchor bolt and the borehole wall, reduces rock fragment detachment and friction reduction, and improves the support effect.
Smart Images
Figure CN224107295U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of geotechnical engineering support, in particular to a double-layer pipe wall pipe-joint anchor rod. BACKGROUND
[0002] The pipe-joint anchor rod is a commonly used mine roadway and tunnel engineering support structure, mainly used for reinforcing surrounding rock and preventing rock mass from loosening and collapsing. The support principle is to fix the surrounding rock in place through the friction and engagement force generated between the pipe-joint anchor rod body and the surrounding rock, so as to prevent the rock mass from displacing or collapsing and ensure the safety and stability of the project. However, when the surrounding rock is severely broken and contains a lot of water, the anchoring effect of the conventional pipe-joint anchor rod will be greatly reduced. On the one hand, the interlayer of the broken rock mass generally contains minerals similar to kaolin mineralization, which will swell after absorbing water, thereby causing the rock mass to fall off; on the other hand, the minerals will form mud after absorbing water, and the mud flowing between the anchor rod body and the borehole wall will greatly reduce the friction between the two, increasing the risk of the anchor rod falling out of the borehole.
[0003] Therefore, it is necessary to design a double-layer pipe wall pipe-joint anchor rod to solve the technical problems that the minerals in the interlayer of the surrounding rock swell after absorbing water, which easily causes the rock mass to fall off, and the mud produced by the minerals after absorbing water greatly reduces the friction between the anchor rod body and the borehole wall. SUMMARY
[0004] In view of the technical problems in the background art, the present application provides a double-layer pipe wall pipe-joint anchor rod, which uses the cooperation of the outer pipe and the inner pipe to set convex points on the surface of the anchor rod that are more in line with the borehole wall, thereby increasing the friction and engagement force between the anchor rod and the wall, and the installation process is simple; the cooperation of the water guide groove, the first water guide hole and the second water guide hole guides the fissure water between the anchor rod body and the borehole wall into the anchor rod, so that the fissure water flows out from the port where the retaining ring is located along the inner wall, thereby playing a water guide and water drainage role on the surrounding rock mass.
[0005] In a first aspect, the embodiments of the present application provide a double-layer pipe wall pipe-joint anchor rod, which comprises an inner pipe, an outer pipe sleeved on the outer part of the inner pipe, and an anchor rod tray sleeved on the outer pipe; the outer pipe and the inner pipe are both hollow columnar structures with a C-shaped cross section; the pipe wall of the inner pipe is provided with a plurality of convex points and a second water guide hole, and the peripheral wall of the outer pipe is provided with convex point holes through which the convex points pass; the peripheral wall of the outer pipe is also provided with a plurality of first water guide holes and a water guide groove connected with the first water guide holes; one end of the outer pipe is provided with a retaining ring.
[0006] Further, the convex point holes and the retaining ring are arranged at two ends of the outer pipe.
[0007] Further, the extension direction of the water guide groove is consistent with the extension direction of the outer pipe.
[0008] Further, the cross-sectional diameter of the inner tube is smaller than the cross-sectional diameter of the outer tube.
[0009] Further, the difference between the cross-sectional diameter of the inner tube and the cross-sectional diameter of the outer tube is less than 1mm.
[0010] Further, the number of the convex points is the same as the number of the convex point holes, and the positions of the convex points and the convex point holes are one-to-one corresponding, and the number of the first water guide holes is the same as the number of the second water guide holes, and the positions of the first water guide holes and the second water guide holes are one-to-one corresponding.
[0011] Further, the sum of the height of the convex point and the cross-sectional diameter of the inner tube is greater than the cross-sectional diameter of the outer tube.
[0012] Further, the length of the inner tube is greater than the length of the outer tube.
[0013] Further, the outer tube and the inner tube are both rigid members, and the elasticity of the inner tube is greater than the elasticity of the outer tube.
[0014] Further, the outer tube is provided with a first indicating line at the same end as the stop ring, and the inner tube is provided with a second indicating line at the same end as the convex point.
[0015] The beneficial effects of the present application are as follows:
[0016] The present application provides a double-layer pipe wall pipe-joint anchor rod, which comprises an inner tube, an outer tube sleeved on the outer part of the inner tube, and an anchor rod tray sleeved on the outer tube, and the outer tube and the inner tube are both hollow columnar structures with a C-shaped cross section. The tube wall of the inner tube is provided with a plurality of convex points and second water guide holes, and the peripheral wall of the outer tube is provided with convex point holes through which the convex points pass. The peripheral wall of the outer tube is also provided with a plurality of first water guide holes and a water guide groove connected with the first water guide holes.
[0017] (1) The present application uses the cooperation of the outer tube and the inner tube to set convex points on the surface of the anchor rod which are more in line with the borehole wall, thereby increasing the friction and engagement force between the anchor rod and the borehole wall, and the installation process is simple.
[0018] (2) The present application uses the cooperation of the water guide groove, the first water guide hole and the second water guide hole to guide the fissure water between the anchor rod body and the borehole wall into the inside of the anchor rod, so that the fissure water flows out from the port where the stop ring is located along the inner wall. In actual use, after the fissure water generated in the surrounding rock contacts the tube wall of the outer tube, it first flows along the water guide groove on the tube wall to the first water guide hole, then flows into the inside of the inner tube through the closely fitted first water guide hole and second water guide hole, and finally flows out from the port where the stop ring is located along the tube wall of the inner tube and drips into the roadway. In this way, the phenomenon of rock block falling caused by the water absorption expansion of minerals in the surrounding rock interlayer, and the phenomenon of the mud flowing to the anchor rod body and the borehole wall caused by water absorption, which greatly reduces the friction between the two, can be reduced, and the surrounding rock mass is water-diverting and water-repellent.
[0019] The above description is only a summary of the technical solutions of the present application. In order to enable one skilled in the art to better understand the technical means of the present application, the present application can be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the technical solutions of the present application, the drawings used in the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.
[0021] Fig. 1 The outer tube structure diagram of the double-layer pipe wall pipe joint anchor rod in the embodiment of the present application;
[0022] Fig. 2 The inner tube structure diagram of the double-layer pipe wall pipe joint anchor rod in the embodiment of the present application;
[0023] Fig. 3 The supporting diagram of the double-layer pipe wall pipe joint anchor rod in the embodiment of the present application. DETAILED DESCRIPTION
[0024] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.
[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.
[0026] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.
[0027] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all referring to a common embodiment, or an embodiment that is independent of all other embodiments. One of ordinary skill in the art will readily recognize from the disclosure herein, that embodiments of the present application can be combined with embodiments of the other applications.
[0028] In the description of the embodiments of the present application, the term“and / or” is merely used to describe an associated relationship between associated objects, and indicates that there can be three relationships, for example, A and / or B can indicate that A exists alone, A and B exist together, and B exists alone. In addition, the character“ / ” herein generally indicates that the front and rear associated objects have an“or” relationship.
[0029] In the description of the embodiments of the present application, the term“a plurality of” refers to two or more (including two), and similarly, “a plurality of groups” refers to two or more groups (including two groups), and “a plurality of pieces” refers to two or more pieces (including two pieces).
[0030] In the description of the embodiments of the present application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential”, and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.
[0031] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing”, and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0032] When the surrounding rock is broken to a large extent and contains a lot of water, on the one hand, the interlayer of the broken rock mass generally contains minerals similar to kaolin mineralization, which will swell after absorbing water, and then cause the rock mass to fall off; on the other hand, after absorbing water, such minerals will form mud, which will flow between the anchor rod body and the hole wall, greatly reducing the friction between the rod body and the hole wall, and increasing the risk of the anchor rod falling out of the hole.
[0033] To solve the technical problem that the water absorption of minerals in the surrounding rock interlayer causes the rock to fall off, and the water absorption of minerals produces mud flow between the anchor rod body and the borehole wall, which greatly reduces the friction between them, the application provides a double-pipe-wall pipe-joint anchor rod, wherein the friction and the bite between the anchor rod and the surrounding rock are increased by arranging protrusions on the pipe wall, and the water between the anchor rod body and the borehole wall is introduced into the anchor rod and flows out from the port by arranging water guide holes and water guide grooves on the pipe wall, thereby playing a water guide and water drainage role.
[0034] Please refer to Figs. 1 to 3 As shown in the figure, the double-pipe-wall pipe-joint anchor rod provided by the application includes an inner pipe 2, an outer pipe 1 sleeved on the outer part of the inner pipe 2, and an anchor rod tray 31 sleeved on the outer pipe 1. The model of the anchor rod tray 31 can be any one commonly used in the field, including but not limited to a circular anchor rod tray, a square anchor rod tray, and a butterfly-shaped anchor rod tray. The anchor rod tray can only fix the end of the anchor rod and prevent the anchor rod from loosening due to vibration or external force in surrounding rock support, and details are not described herein.
[0035] In this embodiment, one end of the outer pipe 1 is provided with a stop ring 11. In surrounding rock support, the stop ring 11 is used to limit the end of the anchor rod and the anchor rod tray 31, so as to prevent the anchor rod from being excessively inserted or slipping off, and at the same time, the anchor rod tray 31 is limited between the surrounding rock 33 and the stop ring 11.
[0036] In this embodiment, the outer pipe 1 and the inner pipe 2 are both rigid members, and the outer pipe 1 and the inner pipe 2 are both hollow columnar structures with a C-shaped cross section. In this way, the outer pipe 1 and the inner pipe 2 have high strength and small elasticity at the same time, and when subjected to external pressure, they will slightly elastically deform, and then return to the original shape after the external force disappears.
[0037] The length of the inner pipe 2 is greater than the length of the outer pipe 1, so that the fissure water led out by the anchor rod is discharged along the pipe wall into the roadway. The cross-sectional diameter of the inner pipe 2 is smaller than the cross-sectional diameter of the outer pipe 1, and the diameter difference between the cross section of the inner pipe 2 and the cross section of the outer pipe 3 is less than 1 mm, so that the inner pipe 2 can be inserted into the outer pipe 1 without being too loose. The elasticity of the inner pipe 2 is greater than that of the outer pipe 1, and those skilled in the art should understand that the rod body elasticity can be adjusted by selecting materials or other ways, and can be selected according to actual needs, and details are not described herein.
[0038] The pipe wall of the inner pipe 2 is also provided with a plurality of protrusions 21 in the shape of hemispheres and a plurality of second water guide holes 22 in the shape of circles. It should be noted that in addition to the shapes shown in this embodiment, the protrusions 21 can also be cylinders, cuboids or any other shape, and the second water guide holes 22 can also be rectangles or any other shape.
[0039] In the embodiment, the peripheral wall of the outer tube 1 is provided with a plurality of circular protrusion holes 12 through which the protrusions 21 pass, the number of the protrusions 21 is the same as that of the protrusion holes 12 and the positions of the protrusions 21 correspond to those of the protrusion holes 12 one by one, and the height of the protrusions 21 and the cross-sectional diameter of the inner tube 2 are greater than the cross-sectional diameter of the outer tube 1. The size and shape of the protrusion holes 12 are sufficient for the protrusions 21 to pass out of the protrusion holes 12, which are not specifically limited herein. In this way, the protrusions 21 pass out of the protrusion holes 12, so that the inner tube 2 is aligned with the tube gap of the outer tube 1, and the protrusions 21 protrude in a direction perpendicular to the tube wall and away from the surface of the anchor rod. Compared with the anchor rod with a smooth surface, the anchor rod with a plurality of protrusions 21 is more suitable for the uneven borehole wall, which is beneficial to increase the friction between the anchor rod and the borehole wall.
[0040] Further, the protrusion holes 12 and the retaining rings 11 are arranged at two ends of the outer tube 1.
[0041] In the embodiment, the peripheral wall of the outer tube 1 is further provided with a plurality of first water guide holes 13 and a water guide groove 14 connected with the first water guide holes 13, and the extension direction of the water guide groove 14 is consistent with the extension direction of the outer tube 1. The number of the first water guide holes 13 is the same as that of the second water guide holes 22 and the positions of the first water guide holes 13 correspond to those of the second water guide holes 22 one by one. In this way, when the outer tube 1 is arranged outside the inner tube 2, the second water guide holes 22 and the first water guide holes 13 overlap one by one. When the fissure water 32 in the surrounding rock 33 contacts the water guide groove 14, the fissure water 32 first flows to the first water guide holes 13 along the water guide groove 14, then flows into the outer tube 1 through the first water guide holes 13, and further flows into the inner tube 2 through the second water guide holes 22, and finally flows out of the anchor rod along the inner wall of the inner tube 2.
[0042] In the embodiment, the protrusions 21, the second water guide holes 22, the protrusion holes 12 and the first water guide holes 13 are arranged in rows and staggered with each other, and the area of a single protrusion hole 12 is greater than that of a single water guide hole 22. It should be understood by those skilled in the art that the positions of the protrusions 21, the second water guide holes 22, the protrusion holes 12 and the first water guide holes 13 only need to satisfy that the protrusions 21 correspond to the protrusion holes 12 one by one and the first water guide holes 13 correspond to the second water guide holes 22 one by one, and other adjustments can be made according to the actual application requirements. Meanwhile, the number of the protrusions 21, the protrusion holes 12, the first water guide holes 13 and the second water guide holes 22 can also be reasonably designed according to the water content and the degree of fragmentation of the surrounding rock 33, which can be any number greater than 2, and is not limited to the embodiment.
[0043] In the embodiment, the outer tube 1 is provided with a first indicating line 15 on the tube wall, which is at the same end as the blocking ring 11, and the inner tube 2 is provided with a second indicating line 23 on the tube wall, which is at the same end as the convex point 21. The first indicating line 15 is a line segment, and the second indicating line 23 is an arrow. It should be noted that the indicating line can also be any other shape that has an indicating effect other than an arrow or a line segment. According to the indication of the indicating line, the inner tube 2 is pushed into the outer tube 1 until the convex point 21 and the convex point hole 12 and the first water guide hole 13 and the second water guide hole 22 are overlapped.
[0044] The working principle of the double-layer tube wall pipe joint anchor rod provided in the application is as follows:
[0045] After the supporting borehole is completed, the anchor rod tray 31 is first inserted through the end of the outer tube 1 provided with a hole to be sleeved on the outer tube 1, and then the outer tube 1 is driven into the borehole, so that one end of the anchor rod tray 31 abuts against the surrounding rock 33, and the other end abuts against the blocking ring 11. At this time, the rod body of the outer tube 1 is extruded by the surrounding rock 33 to be narrowed and tightly abut against the borehole wall, thereby playing a certain friction anchoring effect.
[0046] Then, the first indicating line 15 and the second indicating line 23 are aligned to be on a straight line, and the inner tube 2 is driven into the outer tube 1 in the direction of the arrow of the second indicating line 23. Since the sum of the height of the convex point 21 and the cross-sectional diameter of the inner tube 2 is greater than the cross-sectional diameter of the outer tube 1, the inner tube 2 is slightly elastically deformed under extrusion. When the inner tube 2 contacts the bottom of the borehole, the convex point 21 and the convex point hole 12 and the first water guide hole 13 and the second water guide hole 22 are overlapped. The convex point 21 originally under extrusion is ejected from the convex point hole 12 and tightly abuts against the inner wall of the hole, and at the same time, the first water guide hole 13 abuts against the second water guide hole 22. Since the inner wall of the hole obtained by the borehole is not smooth, the convex point 21 on the surface of the anchor rod is more abutted against the borehole wall, which can effectively increase the friction and engagement force between the anchor rod and the borehole wall.
[0047] Please refer to Fig. 3 The figure shows a schematic diagram of the double-layer tube wall pipe joint anchor rod support provided in the application. After the double-layer tube wall pipe joint anchor rod is installed, the fissure water 32 generated in the surrounding rock 33 first flows along the water guide groove 14 on the tube wall to the first water guide hole 13, and then flows into the inner tube 2 through the first water guide hole 13 and the second water guide hole 22 which are tightly abutted, and finally flows out from the end where the blocking ring 11 is located and drips into the roadway. In this way, the phenomenon of rock block falling caused by the water absorption expansion of minerals in the interlayer of the surrounding rock 33 can be reduced, and the phenomenon of the mud generated by water absorption flowing between the anchor rod rod body and the borehole wall to greatly reduce the friction therebetween can be reduced, thereby playing a water guide and water drainage effect.
[0048] Note that the present application is not limited to the above-described embodiments. The above-described embodiments are merely examples, and embodiments having substantially the same configuration, function, and effect as the technical idea of the present application are included in the technical scope of the present application. Furthermore, other modes constructed by combining a part of the configurations of the embodiments in a manner that a person skilled in the art can think of within the scope of the present application are also included in the scope of the present application.
Claims
1. A double-sheathed pipe wall pipe and thread anchor, characterized in that, The anchor rod tray is arranged on one end of the outer tube, the outer tube and the inner tube are hollow columnar structures with C-shaped cross sections, the inner tube is provided with a plurality of convex points and second water guide holes on the tube wall, the outer tube is provided with convex point holes through which the convex points pass on the peripheral wall, the outer tube is further provided with a plurality of first water guide holes and water guide grooves connected with the first water guide holes on the peripheral wall, and one end of the outer tube is provided with a stop ring.
2. A double-skin wall pipe pile according to claim 1, c h a r a c t e r i s e d in that The convex point holes and the stop ring are arranged at two ends of the outer tube.
3. The dual wall tubular sleeve anchor of claim 1, wherein, The extension direction of the water guide groove is consistent with the extension direction of the outer tube.
4. The dual wall tubular sleeve anchor of claim 1, wherein, The cross-sectional diameter of the inner tube is smaller than the cross-sectional diameter of the outer tube.
5. A double-skin wall tube pile according to claim 4, c h a r a c t e r i z e d in that The diameter difference between the cross section of the inner tube and the cross section of the outer tube is less than 1 mm.
6. The dual wall tubular sleeve anchor of claim 1, wherein, The number of the convex points is the same as that of the convex point holes, and the positions of the convex points and the convex point holes are one-to-one corresponding, the number of the first water guide holes is the same as that of the second water guide holes, and the positions of the first water guide holes and the second water guide holes are one-to-one corresponding.
7. The dual wall tubular sleeve anchor of claim 5, wherein, The sum of the height of the convex point and the cross-sectional diameter of the inner tube is greater than the cross-sectional diameter of the outer tube.
8. The dual wall tubular sleeve anchor of claim 5, wherein, The length of the inner tube is greater than the length of the outer tube.
9. A double-skin wall tubular pile according to claim 8, c h a r a c t e r i s e d in that The outer tube and the inner tube are both rigid members, and the elasticity of the inner tube is greater than that of the outer tube.
10. The dual wall tubular wall pipe pile according to claim 1, wherein, The outer tube is provided with a first indication line on the tube wall at the same end as the stop ring, and the inner tube is provided with a second indication line on the tube wall at the same end as the convex point.