A pull-out force enhanced grouting anchor rod
By designing grouting anchors with enhanced pull-out resistance, the problems of slow reinforcement speed and lag in pull-out resistance of traditional grouting anchors in hard rock masses with developed fractures have been solved. This has enabled rapid anchoring, anti-clogging, and improved tensile strength, meeting the needs of tunnels and underground engineering.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING JIAOTONG UNIV
- Filing Date
- 2025-06-13
- Publication Date
- 2026-06-12
AI Technical Summary
When traditional hollow grouting anchors are used to reinforce hard rock masses with developed fractures, the cement sets and hardens slowly, and the pull-out resistance takes effect late, which cannot meet the actual needs of tunnels and underground engineering.
A grouting anchor bolt with enhanced pull-out resistance was designed, comprising a hollow rod body, a grouting cylinder, a fixing unit, and a protective unit. Through structures such as grouting holes, fixing cones, and protective shells, it achieves rapid anchoring and prevents blockage, thereby enhancing tensile strength and grouting efficiency.
It provides rapid anchoring force, improves anchoring reliability, prevents grouting hole blockage, enhances tensile strength and grouting efficiency, ensures uniform prestress transfer, and extends the service life of the anchor rod.
Smart Images
Figure CN224351989U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of anchor bolt technology, specifically to a grouting anchor bolt with enhanced pull-out resistance. Background Technology
[0002] Hollow grouting anchors are an advanced anchor system used in geotechnical engineering support, primarily for the reinforcement and stabilization of tunnels, slopes, and underground caverns. Their core principle involves injecting grout (cement grout or chemical grout) into the hollow anchor body, allowing the grout to penetrate the surrounding soil and rock, forming a reinforced zone (grouting body). Simultaneously, the bond between the anchor body and the grout provides tensile and shear bearing capacity. Traditional grouting anchors mainly include: ordinary hollow anchors (without grouting function), mortar anchors (non-hollow), self-drilling hollow grouting anchors, reusable grouting anchors, and GFRP (glass fiber reinforced plastic) hollow grouting anchors.
[0003] The inventors discovered that in tunnels and underground engineering, although hard rock masses with well-developed fissures have high uniaxial compressive strength, their overall stability is often poor due to the widespread distribution of joints and fissures. Traditional hollow grouting anchors often face problems such as slow cement setting and hardening speed, long time required to reach the design strength, and delayed pull-out force activation time when reinforcing such rock masses, which cannot meet the actual needs in this scenario. Utility Model Content
[0004] The purpose of this invention is to provide a grouting anchor bolt with enhanced pull-out resistance to solve at least one of the technical problems existing in the background art.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] This utility model provides a grouting anchor bolt with enhanced pull-out resistance, comprising a hollow rod body and an anchor head;
[0007] The bottom end of the hollow rod is fixedly connected to a grouting cylinder. Grouting holes are evenly opened on the surface of the grouting cylinder. The grouting holes are connected to the mortar channels inside the hollow rod. The bottom end of the grouting cylinder is connected to the top of the fixed base.
[0008] The anchor head is fixed to the bottom of the fixing seat, and a fixing unit is provided on the outer side of the fixing seat. The top of the fixing seat is movably connected to the protective unit; the protective shell of the protective unit is in contact with the outer side of the grouting cylinder.
[0009] Furthermore, the fixing unit includes a fixing cone, a support frame, a rotating block, a placement groove, and a fixing shaft. The placement groove is disposed on the outer side of the fixing seat, and the fixing shaft is fixed to the side of the placement groove. One end of the support frame is movably connected to the fixing shaft through the rotating block, and the other end is fixedly connected to the fixing cone.
[0010] Furthermore, the protective unit includes a protective shell, a fixing rod, and a rod groove disposed inside the fixing base; wherein, the protective shell is fixedly connected to one end of the fixing rod, and the fixing rod is slidably connected to the fixing base through the rod groove.
[0011] Furthermore, the outer surface of the protective shell is also fixedly connected to a pre-set pull ring by a fixing rope.
[0012] Furthermore, the rod groove corresponds to the position of the placement groove.
[0013] Furthermore, the protective unit also includes a T-shaped block, one end of which is fixedly connected to the support frame of the fixing unit, and the other end is slidably connected to the fixing rod through a T-shaped groove on the fixing rod.
[0014] Furthermore, the protective unit also includes a coil spring, which is sleeved on the fixing shaft of the fixing unit. One end of the coil spring is connected to the inner side of the fixing unit support frame, and the other end is connected to the bottom surface of the placement groove of the fixing unit.
[0015] Furthermore, the grouting anchor also includes a grout stop plug and a pad, wherein the grout stop plug is sleeved on the hollow rod body, and the through hole in the middle of the pad is slidably connected to the outer side of the hollow rod body.
[0016] Furthermore, the grouting anchor also includes a locking sleeve and a nut, wherein the inner thread of the locking sleeve matches the outer thread of the hollow rod body, and the nut is located on the upper part of the locking sleeve.
[0017] Furthermore, the hollow rod body is provided with a protective layer and a corrosion-resistant layer from the inside out.
[0018] The beneficial effects of this utility model are:
[0019] This utility model provides a grouting anchor with enhanced pull-out resistance. The solution, through the setting of a fixing unit, can provide a certain anchoring force immediately after the anchor is inserted into the hole, thereby accelerating the waiting time for the grouting anchor to provide pull-out resistance and improving its anchoring reliability in fractured hard rock. At the same time, the setting of a protective unit can effectively prevent the grouting hole from being blocked by falling rocks during the insertion process, thus preventing problems that affect subsequent use.
[0020] The aforementioned scheme allows the rotating support frame to be secured inside the hole, while the fixing cone on the top surface of the support frame increases the stability of the anchor bolt fixing, thereby increasing its tensile strength.
[0021] The proposed solution uses a protective shell to prevent the grouting holes from being blocked by falling rocks during the anchor bolt insertion process, thus affecting the efficiency of subsequent grouting. At the same time, the design of the pull ring and fixing rope makes it easy for operators to remove the protective shell.
[0022] The proposed solution uses a hollow rod body in conjunction with a grouting cylinder to evenly inject mortar into the hole. The grout stopper prevents the mortar from flowing out of the hole, and the installed pad enhances the support effect on the rock wall, ensuring that the prestress of the anchor rod can be evenly transferred to the rock wall.
[0023] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of the invention. Attached Figure Description
[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 This is a schematic diagram of a grouting anchor structure with enhanced pull-out resistance according to an embodiment of the present utility model;
[0026] Figure 2 As described in the embodiments of this utility model Figure 1 A magnified view of the structure at point A in the middle;
[0027] Figure 3 This is a schematic diagram of the cross-sectional structure of the hollow rod body according to an embodiment of the present utility model;
[0028] Figure 4 The reference dimensions are those of the fixing unit described in the embodiments of this utility model;
[0029] Figure 5 The reference dimensions are those of the fixed cone described in the embodiments of this utility model;
[0030] The components are as follows: 1. Hollow rod body; 2. Fixing unit; 2-1. Fixing cone; 2-2. Support frame; 2-3. Rotating block; 2-4. Placement slot; 2-5. Fixing shaft; 3. Protective unit; 3-1. Protective shell; 3-2. Fixing rod; 3-3. Rod groove; 3-4. Fixing rope; 3-5. Pull ring; 3-6. T-slot; 3-7. T-block; 3-8. Coil spring; 4. Grouting cylinder; 5. Grouting hole; 6. Fixing seat; 7. Anchor head; 8. Grout stop plug; 9. Pad; 10. Locking sleeve; 11. Nut; 12. Protective layer; 13. Corrosion resistant layer. Detailed Implementation
[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0032] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.
[0033] It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as here.
[0034] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the word “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, and / or groups thereof.
[0035] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. Furthermore, the described specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.
[0036] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0037] In the description of this specification, the terms “center,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” 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 technology and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this technology.
[0038] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of these terms in this art according to the specific circumstances.
[0039] To facilitate understanding of this utility model, the present utility model will be further explained and described below with reference to the accompanying drawings and specific embodiments. The specific embodiments do not constitute a limitation on the embodiments of this utility model.
[0040] Those skilled in the art should understand that the accompanying drawings are merely schematic diagrams of embodiments, and the components in the drawings are not necessarily essential for implementing this utility model.
[0041] like Figure 1 As shown, this embodiment provides a grouting anchor bolt with enhanced pull-out resistance, including a hollow rod body 1 and an anchor head 7;
[0042] The bottom end of the hollow rod 1 is fixedly connected to a grouting cylinder 4. Grouting holes 5 are evenly opened on the surface of the grouting cylinder 4. The grouting holes 5 are connected to the mortar channels inside the hollow rod 1. The bottom end of the grouting cylinder 4 is connected to the top of the fixed base 6.
[0043] The anchor head 7 is fixed to the bottom of the fixing seat 6. The fixing seat 6 has a fixing unit 2 on its outer side. The top of the fixing seat 6 is movably connected to the protective unit 3. The protective shell 3-1 of the protective unit 3 is attached to the outer side of the grouting cylinder 4.
[0044] In a specific implementation, the fixing unit includes a fixing cone 2-1, a support frame 2-2, a rotating block 2-3, a placement groove 2-4, and a fixing shaft 2-5. The placement groove 2-4 is disposed on the outer side of the fixing seat 6, and the fixing shaft 2-5 is fixed to the side of the placement groove 2-4. One end of the support frame 22 is movably connected to the fixing shaft 2-5 through the rotating block 2-3, and the other end is fixedly connected to the fixing cone 2-1.
[0045] Specifically, such as Figure 2As shown, the placement grooves 2-4 are evenly opened on the upper and lower sides of the outer side of the fixed base 6. The fixed shaft 2-5 is rotatably installed inside the placement grooves 2-4. Rotating blocks 2-3 are fixed at both ends of the inner side of the support frame 2-2. The through hole in the middle of the rotating block 2-3 is rotatably connected to the outer side of the fixed shaft 2-5. Fixed cones 2-1 are fixed on both sides of the top surface of the support frame 2-2. The rotatably installed support frame 2-2 can be stuck inside the hole. The fixed cones 2-1 on the top surface of the support frame 2-2 can increase the stability of the anchor rod fixation, thereby increasing its tensile strength.
[0046] In a specific implementation, the protective unit includes a protective shell, a fixing rod, and a rod groove disposed inside the fixing seat; wherein, the protective shell is fixedly connected to one end of the fixing rod, and the fixing rod is slidably connected to the fixing seat through the rod groove.
[0047] The outer surface of the protective shell is also fixedly connected to a preset pull ring by a fixing rope; and the rod groove corresponds to the position of the placement groove.
[0048] Furthermore, the protective unit also includes a T-shaped block, one end of which is fixedly connected to the support frame of the fixing unit, and the other end is slidably connected to the fixing rod through a T-shaped groove on the fixing rod.
[0049] Furthermore, the protective unit also includes a coil spring, which is sleeved on the fixing shaft of the fixing unit. One end of the coil spring is connected to the inner side of the fixing unit support frame, and the other end is connected to the bottom surface of the placement groove of the fixing unit.
[0050] Specifically, the protective unit 3 also includes a protective shell 3-1, a fixing rod 3-2, a rod groove 3-3, a fixing rope 3-4, and a pull ring 3-5. The rod grooves 3-3 are evenly distributed on the top surface of the fixing seat 6, and the positions of the rod grooves 3-3 and the placement grooves 2-4 correspond to each other. The bottom end of the protective shell 3-1 is provided with a fixing rod 3-2, which is slidably connected to the inside of the rod groove 3-3. The protective shell 3-1 is in contact with the outer side of the grouting cylinder 4. The bottom end of the fixing rope 3-4 is connected to the outer side of the protective shell 3-1, and the top end of the fixing rope 3-4 is equipped with a pull ring 3-5. The protective shell 3-1 can prevent the grouting hole 5 from being blocked by falling rocks during the anchor rod insertion process, so as to affect the efficiency of subsequent grouting. At the same time, the pull ring 3-5... 5. With the help of the fixing rope 3-4, the protective shell 3-1 can be easily removed by personnel. The protective unit 3 also includes a T-slot 3-6, a T-block 3-7 and a coil spring 3-8. The T-slot 3-6 is opened on the outer side of the fixing rod 3-2. The T-block 3-7 is fixed on the inner side of the support frame 2-2. The T-block 3-7 is slidably connected to the inside of the T-slot 3-6. The coil spring 3-8 is sleeved on the outside of the fixing shaft 2-5. One end of the coil spring 3-8 abuts against the inner side of the support frame 2-2, and the other end of the coil spring 3-8 abuts against the bottom surface inside the placement groove 2-4. The T-block 3-7 can be fixed to the support frame 2-2 by inserting into the T-slot 3-6, while the sleeved coil spring 3-8 can automatically unfold the support frame 2-2 to fix the anchor rod.
[0051] In specific implementation, the grouting anchor also includes a grout stop plug 8 and a pad 9, wherein the grout stop plug 8 is sleeved on the hollow rod body 1, and the through hole in the middle of the pad 9 is slidably connected to the outer side of the hollow rod body 1.
[0052] Specifically, the grout stopper 8 is sleeved on the outside of the hollow rod body 1, and the through hole in the middle of the pad plate 9 is slidably connected to the outside of the hollow rod body 1. The hollow rod body 1, together with the grouting cylinder 4, can evenly inject mortar into the hole. The grout stopper 8 can prevent mortar from flowing out of the hole, and the installed pad plate 9 can enhance the support effect on the rock wall, ensuring that the prestress of the anchor rod can be evenly transmitted to the rock wall.
[0053] In a specific implementation, the grouting anchor also includes a locking sleeve 10 and a nut 11, wherein the inner thread of the locking sleeve 10 matches the outer thread of the hollow rod body 1, and the nut 11 is located on the upper part of the locking sleeve 10.
[0054] Specifically, the locking sleeve 10 is threadedly installed inside the hollow rod body 1 on the outside. A nut 11 is fixed on the top surface of the locking sleeve 10. The locking sleeve 10 is convenient for manual fixing by personnel, and the nut 11 installed on the top can increase the firmness of the fixation.
[0055] Furthermore, the hollow rod body is provided with a protective layer and a corrosion-resistant layer from the inside out.
[0056] Specifically, the protective layer 12 is located on the outside of the hollow rod body 1. The protective layer 12 is a galvanized layer, and the outer surface of the protective layer 12 is coated with a corrosion-resistant layer 13, which is epoxy resin. The combination of the protective layer 12 and the corrosion-resistant layer 13 can increase the wear resistance, oxidation resistance and corrosion resistance of the anchor rod, thereby increasing the service life of the anchor rod.
[0057] For ease of understanding, the working principle of the grouting anchor bolt with enhanced pull-out resistance provided in this embodiment will be explained in detail below:
[0058] First, the fixed seat 6, together with the anchor head 7, inserts the hollow rod 1 into the hole. The protective shell 3-1 on the outside of the grouting cylinder 4 can prevent the grouting hole 5 from being blocked by falling rocks during the insertion of the anchor rod, thus affecting the efficiency of subsequent grouting. After the anchor rod is inserted into the appropriate position, pull the pull ring 3-5 to pull the fixed rod 3-2 out of the rod groove 3-3. At this time, the T-block 3-7 leaves the T-groove 3-6, causing the coil spring 3-8 to unfold. This allows the support frame 2-2 to unfold automatically. Together with the top fixed cone 2-1, this can increase the firmness of the anchor rod installation, thereby increasing its tensile strength. Then, the hollow rod 1, together with the grouting cylinder 4, can evenly inject mortar into the hole. The grout stopper 8 can prevent mortar from flowing out of the hole. The installed pad 9 can enhance the support effect on the rock wall, ensuring that the prestress of the anchor rod can be evenly transmitted to the rock wall. The protective layer 12, together with the corrosion-resistant layer 13, can increase the wear resistance, oxidation resistance and corrosion resistance of the anchor rod, thus increasing the service life of the anchor rod.
[0059] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that, based on the technical solutions disclosed in the present utility model, all modifications or variations that can be made by those skilled in the art without creative effort should be included within the scope of protection of the present utility model.
Claims
1. A grouting anchor bolt with enhanced pull-out resistance, characterized in that, Includes hollow rod body and anchor head; The bottom end of the hollow rod is fixedly connected to a grouting cylinder. Grouting holes are evenly opened on the surface of the grouting cylinder. The grouting holes are connected to the mortar channels inside the hollow rod. The bottom end of the grouting cylinder is connected to the top of the fixed base. The anchor head is fixed to the bottom of the fixing seat, and a fixing unit is provided on the outer side of the fixing seat. The top of the fixing seat is movably connected to the protective unit; the protective shell of the protective unit is in contact with the outer side of the grouting cylinder.
2. The grouting anchor bolt with enhanced pull-out resistance as described in claim 1, characterized in that, The fixing unit includes a fixing cone, a support frame, a rotating block, a placement slot, and a fixing shaft. The placement slot is disposed on the outer side of the fixing seat, and the fixing shaft is fixed to the side of the placement slot. One end of the support frame is movably connected to the fixing shaft through the rotating block, and the other end is fixedly connected to the fixing cone.
3. A grouting anchor bolt with enhanced pull-out resistance as described in claim 2, characterized in that, The protective unit includes a protective shell, a fixing rod, and a rod groove disposed inside the fixing base; wherein, the protective shell is fixedly connected to one end of the fixing rod, and the fixing rod is slidably connected to the fixing base through the rod groove.
4. A grouting anchor bolt with enhanced pull-out resistance as described in claim 3, characterized in that, The outer side of the protective shell is also fixedly connected to a pre-set pull ring by a fixing rope.
5. A grouting anchor bolt with enhanced pull-out resistance as described in claim 3, characterized in that, The rod groove corresponds to the position of the placement groove.
6. A grouting anchor bolt with enhanced pull-out resistance as described in claim 3, characterized in that, The protective unit also includes a T-shaped block, one end of which is fixedly connected to the support frame of the fixed unit, and the other end is slidably connected to the fixed rod through a T-shaped groove on the fixed rod.
7. A grouting anchor bolt with enhanced pull-out resistance as described in claim 3, characterized in that, The protective unit also includes a coil spring, which is sleeved on the fixed shaft of the fixed unit. One end of the coil spring is connected to the inner side of the support frame of the fixed unit, and the other end is connected to the bottom surface of the placement slot of the fixed unit.
8. A grouting anchor bolt with enhanced pull-out resistance as described in claim 1, characterized in that, The grouting anchor also includes a grout stop plug and a pad, wherein the grout stop plug is sleeved on the hollow rod body, and the through hole in the middle of the pad is slidably connected to the outer side of the hollow rod body.
9. A grouting anchor bolt with enhanced pull-out resistance as described in claim 1, characterized in that, The grouting anchor also includes a locking sleeve and a nut, wherein the inner thread of the locking sleeve matches the outer thread of the hollow rod body, and the nut is located on the upper part of the locking sleeve.
10. A grouting anchor bolt with enhanced pull-out resistance as described in claim 1, characterized in that, The hollow rod body is provided with a protective layer and a corrosion-resistant layer from the inside out.