Expansion anchor rod structure
By designing the expansion anchor structure, the expansion part and grouting technology are used to enhance the contact and friction between the anchor and the rock and soil body, the problem of low pull-out resistance of traditional anchors is solved, and the stability and load bearing of the support system are significantly improved. ability.
Patent Information
- Application Number
- CN202420828466.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-19
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-04-19
AI Technical Summary
Traditional anchors have low pull resistance and are prone to slip, especially in soft soil, which is more obvious, resulting in an increase in the risk of support accidents.
An expansion anchor structure is designed, including an inner rod, an outer rod and an anchor head. The outer rod forms an expansion part near the end of the anchor head, and there are channels and through holes in the inner rod. The expansion part increases with the rock and soil when the other end of the outer rod expands. The contact area and friction force of the body are enhanced, and the strength of the expansion part is enhanced through grouting, the multi-slicing design enhances multi-point support, the thread locking member is fixed in the expansion state, and the conical anchor head reduces the insertion resistance.
It significantly improves the pull-resistance and overall stability of the anchor, enhances the contact area and friction with the rock and soil body, distributes prestress evenly, reduces the risk of stress concentration, and improves the bearing capacity and stability of the support system.
Smart Images
Figure CN222254024U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of construction engineering, in particular to an expansion anchor rod structure. Background Art
[0002] As an important part of the support system, anchor rods can reinforce the surrounding rock of the tunnel or the rock and soil of the slope so that it can support itself. The arrangement and installation of anchor rods can form an effective support structure, increase the overall stability of the rock and soil, and prevent it from slipping, delamination and falling.
[0003] However, the main function of traditional anchor rods is to fix and support rock and soil to prevent them from sliding or collapsing. They are designed to mainly bear tensile forces, and the traditional anchor rod installation process mainly involves inserting or driving the anchor rod into the rock and soil, and fixing it in the rock and soil through mechanical anchoring or bonding force, which makes the contact area with the surrounding rock small. When the anchor cable is locked, it is easy to cause the anchor cable to slip, causing support accidents. In addition, the pull-out resistance of traditional anchor rods is small, and its pull-out resistance is mainly determined by the friction resistance of the soil layer, the diameter of the anchor section, the anchor length, etc. In soft soil, the soil anchor resistance is low, and the anchor rod length is limited, so the role of the anchor rod is greatly reduced. Utility Model Content
[0004] The utility model provides an expansion anchor rod structure to solve the problems that the traditional anchor rod has low pull-out resistance and is easy to slip off.
[0005] The present application provides an expansion anchor rod structure, comprising an inner rod, an outer rod and an anchor head, wherein the outer rod is sleeved on the inner rod, and one end of the inner rod and one end of the outer rod are both connected to the anchor head; an expansion portion is formed on the outer rod near one end of the anchor head, and the expansion portion is configured to expand when the other end of the outer rod is close to the anchor head; a channel is formed in the inner rod, and the channel penetrates the inner rod along the length direction of the inner rod; a through hole is formed on the rod wall of the inner rod, the channel is connected to the through hole, and the through hole corresponds to the position of the expansion portion.
[0006] According to the above technical features, the expansion anchor rod structure of the utility model can be applied to the support system. Since the outer rod in the utility model is formed with an expansion portion near one end of the anchor head, the expansion portion is configured to expand when the other end of the outer rod is close to the anchor head, thereby enhancing the contact and friction with the rock and soil around the anchor hole, and forming a close fit with the hole wall, which not only increases the contact area between the anchor rod and the rock and soil, but also significantly improves the friction and pull-out resistance, effectively transfers and disperses the prestress, and improves the overall stability and bearing capacity of the support system.
[0007] In the utility model, a channel is formed in the inner rod to facilitate grouting into the anchor hole through the expansion anchor rod from the outside, and a through hole is formed on the wall of the inner rod, and the channel is connected to the through hole, so that the grout can pass through the through hole and penetrate into the surrounding of the anchor hole, bonding the broken surrounding rock or soil together, and improving the overall bearing capacity of the rock layer or soil. The expansion part corresponds to the position of the through hole, and then the grout can fill the expansion part in the expanded state during the grouting process to improve the strength of the expansion part.
[0008] Furthermore, the expansion portion includes a slice, and the slice is configured to be able to bend away from the inner rod when the other end of the outer rod is close to the anchor head.
[0009] Furthermore, the number of the slices is not less than two, each of the slices is arranged along the length direction of the outer rod, and each of the slices can be spliced together to cover the inner rod.
[0010] According to the above technical features, the expansion part in the utility model is a structure formed by slicing one end of the outer rod along the length direction of the outer rod, and when each slice is close to the anchor head at the other end of the outer rod, the slice can bend, thereby expanding the expansion part.
[0011] The expansion part of the utility model includes multiple slices that can contact the hole wall more comprehensively to form multi-point support, which not only increases the contact area between the expansion anchor rod and the rock and soil body, but also enables the expansion anchor rod to disperse stress more evenly when subjected to force, thereby enhancing the anchoring effect. At the same time, the setting of multiple slices enables the expansion anchor rod to better adapt to holes of different shapes and sizes, achieve a tighter fit, effectively reduce the loosening and displacement of the rock and soil body, and improve the overall stability of the support structure.
[0012] Furthermore, it also includes a first locking piece, and a second locking piece is arranged on the inner rod; when the other end of the outer rod is close to the anchor head, the first locking piece can be connected with the second locking piece to lock the position of the outer rod.
[0013] Furthermore, the first locking piece is a nut, the second locking piece is a thread, and the thread is distributed on the wall of the inner rod.
[0014] According to the above technical features, the utility model fixes the position of the inner rod through the cooperation of the thread and the nut, so as to lock the expansion state of the expansion part and prevent the expansion part from stretching and resetting.
[0015] Furthermore, the number of the through holes is not less than two, and the through holes are evenly distributed along the length direction of the outer rod.
[0016] According to the above technical features, during the grouting process, the provision of multiple through holes can enable the slurry to more efficiently penetrate into the surrounding soil and consolidate with the soil.
[0017] Furthermore, the anchor head is a conical structure.
[0018] According to the above technical features, the conical anchor head design makes it easier to insert and fix in the rock and soil, which helps to reduce the resistance during insertion and makes the expansion anchor installation process smoother and more efficient. In the utility model, when the conical anchor head is subjected to force, it can disperse the stress to a larger area, which helps to reduce stress concentration and reduce the risk of damage to the anchor head and the surrounding rock and soil.
[0019] Furthermore, the bottom diameter of the anchor head is equal to the diameter of the outer rod.
[0020] According to the above technical features, in this embodiment, since the diameter of the bottom surface of the anchor head is the same as the diameter of the outer rod, the cross-sectional area of the entire expansion anchor rod remains consistent, which helps to maintain the uniformity of the anchor rod when subjected to force and avoid stress concentration. In addition, the overall structural strength of the anchor rod can be significantly improved, so that the expansion anchor rod can better withstand various external forces.
[0021] At the same time, the bottom diameter of the anchor head is the same as the diameter of the outer rod, which can ensure that the contact area between the anchor head and the rock and soil is maximized, so as to increase the friction between the anchor head and the rock and soil and improve the anchoring effect; it can also reduce the loosening and deformation of the rock and soil around the outer rod and further enhance the stability of the anchoring.
[0022] Furthermore, the length of the inner rod is greater than that of the outer rod, so that the end of the inner rod away from the anchor head can extend out of the outer rod.
[0023] According to the above technical features, the end of the inner rod extending out of the outer rod can be connected to the tensioning device, which applies tension to the inner rod, and the position of the outer rod is fixed, so that the outer rod is squeezed during the pulling process of the inner rod to expand the expansion part.
[0024] Furthermore, the wall thickness of the inner rod is greater than the wall thickness of the outer rod.
[0025] According to the above technical features, the outer rod in the utility model is made of a relatively thinner material than the inner rod, so that the outer rod has higher toughness and extensibility, which is conducive to the formation of the expansion part.
[0026] Beneficial effects achieved by the utility model:
[0027] 1. The expansion anchor rod structure of the utility model can be applied to the support system. Since the outer rod in the utility model is formed with an expansion part near one end of the anchor head, the expansion part is configured to expand when the other end of the outer rod is close to the anchor head, thereby enhancing the contact and friction with the rock and soil around the anchor hole, forming a close fit with the hole wall, which not only increases the contact area between the anchor rod and the rock and soil, but also significantly improves the friction and pull-out resistance, effectively transfers and disperses the prestress, and improves the overall stability and bearing capacity of the support system.
[0028] 2. In the utility model, a channel is formed in the inner rod to facilitate grouting into the anchor hole through the expansion anchor rod from the outside, and a through hole is formed on the wall of the inner rod, and the channel is connected to the through hole, so that the grout can pass through the through hole and penetrate around the anchor hole, bonding the broken surrounding rock or soil together, and improving the overall bearing capacity of the rock layer or soil. The expansion part corresponds to the position of the through hole, and then the grout can fill the expansion part in the expanded state during the grouting process to improve the strength of the expansion part. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0030] Figure 2 This is a schematic diagram of the outer rod structure of the utility model;
[0031] Figure 3 This is a schematic diagram of the inner rod structure of the utility model;
[0032] Figure 4 It is a schematic diagram of the structure of the utility model in the expanded state.
[0033] Reference numerals:
[0034] 1-inner rod, 11-through hole, 12-second locking piece;
[0035] 2-outer rod, 21-expansion part, 211-slice;
[0036] 3- Anchor head;
[0037] 4-First locking member.
[0038] The drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The same or similar numbers correspond to the same or similar parts. The terms describing the positional relationship in the drawings are only used for illustrative purposes and should not be construed as limitations on this patent. DETAILED DESCRIPTION
[0039] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific embodiments should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.
[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the specific technical solution of the present application will be further described in detail below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.
[0041] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more.
[0042] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.
[0043] In the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.
[0044] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.
[0045] The technical solution of the present utility model is described in detail below in conjunction with the specific drawings.
[0046] like Figure 1-Figure 4As shown, an expansion anchor rod structure includes an inner rod 1, an outer rod 2 and an anchor head 3, the outer rod 2 is sleeved on the inner rod 1, and one end of the inner rod 1 and one end of the outer rod 2 are both connected to the anchor head 3; an expansion portion 21 is formed at one end of the outer rod 2 close to the anchor head 3, and the expansion portion 21 is configured to be able to expand when the other end of the outer rod 2 is close to the anchor head 3; a channel is formed in the inner rod 1, and the channel penetrates the inner rod 1 along the length direction of the inner rod 1; a through hole 11 is formed on the rod wall of the inner rod 1, the channel is connected to the through hole 11, and the through hole 11 corresponds to the position of the expansion portion 21.
[0047] The expansion anchor rod structure of this embodiment can be applied to the support system. Since the outer rod 2 in this embodiment is formed with an expansion portion 21 near one end of the anchor head 3, the expansion portion 21 is configured to expand when the other end of the outer rod 2 is close to the anchor head 3, thereby enhancing the contact and friction with the rock and soil around the anchor hole, and forming a close fit with the hole wall, which not only increases the contact area between the anchor rod and the rock and soil, but also significantly improves the friction and pull-out resistance, effectively transfers and disperses the prestress, and improves the overall stability and bearing capacity of the support system.
[0048] Specifically, the expansion anchor rod of this embodiment can be driven into the soil layer using a soil anchoring machine, or a hole can be drilled and cleaned by a drilling machine, and the expansion anchor rod can be directly placed in the anchor hole. Since one end of the inner rod 1 and one end of the outer rod 2 are both connected to the anchor head 3, after the expansion anchor rod is placed, the position of the outer rod 2 is fixed, and a tensioning device is used to apply a pulling force to the inner rod 1, so that the anchor head 3 approaches the other end of the outer rod 2, and the expansion part 21 expands, and produces a soil squeezing effect with the rock and soil around the anchor hole, and is tightly anchored to the surrounding soil. Finally, the position of the inner rod 1 is fixed to complete the installation of the expansion anchor rod.
[0049] In this embodiment, a channel is formed in the inner rod 1 to facilitate grouting into the anchor hole through the expansion anchor rod from the outside, and a through hole 11 is formed on the rod wall of the inner rod 1. The channel is connected to the through hole 11, so that the grout can pass through the through hole 11 and penetrate around the anchor hole, bonding the broken surrounding rock or soil together to improve the overall bearing capacity of the rock layer or soil. The expansion part 21 corresponds to the position of the through hole 11, and the grout can fill the expansion part 21 in the expanded state during the grouting process to improve the strength of the expansion part 21.
[0050] In contrast, ordinary anchor rods are usually fixed in the rock and soil only by mechanical anchoring or bonding force, and their prestressing ability is relatively limited. Ordinary anchor rods often cannot provide the same close fit and uniform prestress distribution as expansion anchor rods. The expansion anchor rod structure in this embodiment can evenly distribute the prestress around the hole wall through the expansion mechanism, ensuring the effective transmission and distribution of the prestress. This uniformity reduces stress concentration and potential damage risks, and improves the overall stability and bearing capacity of the support system.
[0051] like Figure 1 and Figure 2 As shown, in this embodiment, the expansion portion 21 includes a plurality of slices 211, each slice 211 is arranged along the length direction of the outer rod 2, and the plurality of slices 211 are spliced to cover the inner rod 1; each slice 211 is configured to be able to bend when the other end of the outer rod 2 is close to the anchor head 3. In this embodiment, the expansion portion 21 is a structure formed by slicing and dividing one end of the outer rod 2 along the length direction of the outer rod 2, and then each slice 211 can bend when the other end of the outer rod 2 is close to the anchor head 3 (that is, when each slice 211 is squeezed), thereby causing the expansion portion 21 to expand.
[0052] In this embodiment, the expansion portion 21 includes a plurality of slices 211 that can contact the hole wall more comprehensively, forming a multi-point support, which not only increases the contact area between the expansion anchor rod and the rock and soil body, but also enables the expansion anchor rod to disperse stress more evenly when subjected to force, thereby enhancing the anchoring effect. At the same time, the provision of multiple slices 211 enables the expansion anchor rod to better adapt to holes of different shapes and sizes, achieving a tighter fit, thereby effectively reducing the loosening and displacement of the rock and soil body, and improving the overall stability of the support structure.
[0053] like Figure 1 , Figure 3-Figure 4 As shown, the present embodiment further includes a first locking member 4, and a second locking member 12 is provided on the inner rod 1; when the other end of the outer rod 2 is close to the anchor head 3, the first locking member 4 can be connected with the second locking member 12 to lock the position of the outer rod 2. The first locking member 4 is a nut, and the second locking member 12 is a thread, and the thread is distributed on the rod wall of the inner rod 1. In the present embodiment, the position of the inner rod is fixed by the cooperation of the thread and the nut, so as to lock the expansion state of the expansion part 21 and prevent the expansion part 21 from stretching and resetting.
[0054] like Figure 3 As shown, in this embodiment, the number of through holes 11 is not less than two, and each through hole 11 is evenly distributed along the length direction of the outer rod 2, and the position of each through hole 11 corresponds to the position of the expansion part 21. When the expansion part 21 expands, each through hole 11 is connected with the anchor hole, so that the slurry can more efficiently penetrate into the surrounding soil and consolidate with the soil.
[0055] During the specific grouting process, ordinary or high-strength grouting material is used as the grouting material. The grouting is injected from the end of the channel away from the anchor head 3. The slurry flows through the channel and flows out from each through hole 11, filling the expansion area of the outer rod 2, and penetrating into the surrounding soil and consolidating with it until the grouting material fills the top of the channel and the grouting work is completed.
[0056] like Figure 1 , Figure 3-Figure 4As shown, in this embodiment, the anchor head 3 is a conical structure. The conical anchor head 3 is designed to make it easier to insert and fix in the rock and soil, which helps to reduce the resistance during insertion and makes the installation process of the expansion anchor rod smoother and more efficient. In this embodiment, when the conical anchor head 3 is subjected to force, it can disperse the stress to a larger area, which helps to reduce the stress concentration phenomenon and reduce the risk of damage to the anchor head 3 and the surrounding rock and soil.
[0057] like Figure 1 , Figure 3-Figure 4 As shown, in this embodiment, the bottom diameter of the anchor head 3 is equal to the diameter of the outer rod 2. In this embodiment, since the bottom diameter of the anchor head 3 is the same as the diameter of the outer rod 2, the cross-sectional area of the entire expansion anchor rod remains consistent, which helps to maintain the uniformity of the anchor rod when subjected to force and avoid stress concentration. In turn, the overall structural strength of the anchor rod can be significantly improved, so that the expansion anchor rod can better withstand various external forces.
[0058] At the same time, the bottom diameter of the anchor head 3 is the same as the diameter of the outer rod 2, which can ensure that the contact area between the anchor head 2 and the rock and soil is maximized, so as to increase the friction between the anchor head 3 and the rock and soil and improve the anchoring effect; it can also reduce the loosening and deformation of the rock and soil around the outer rod 2 and further enhance the stability of the anchoring.
[0059] like Figure 1 and Figure 4 As shown, in this embodiment, the length of the inner rod 1 is greater than that of the outer rod 2, so that the end of the inner rod 1 away from the anchor head 3 can extend out of the outer rod 2. The end of the inner rod 1 extending out of the outer rod 2 can be connected to a tensioning device, which applies a tensile force to the inner rod 1, and the position of the outer rod 2 is fixed, so that the inner rod 1 squeezes the outer rod 2 during the pulling process, so that the expansion portion 21 expands.
[0060] In this embodiment, the wall thickness of the inner rod 1 is greater than that of the outer rod 2. In this embodiment, the outer rod 2 is made of a relatively thinner material than the inner rod 1, so that the outer rod 2 has higher toughness and ductility, which is helpful for the formation of the expansion portion 21.
[0061] The serial numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The above are only preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.
Claims
1. An expansion anchor structure, characterized in that: It comprises an inner rod (1), an outer rod (2) and an anchor head (3), wherein the outer rod (2) is sleeved on the inner rod (1), and one end of the inner rod (1) and one end of the outer rod (2) are both connected to the anchor head (3); An expansion portion (21) is formed at one end of the outer rod (2) close to the anchor head (3), and the expansion portion (21) is configured to expand when the other end of the outer rod (2) is close to the anchor head (3); A channel is formed inside the inner rod (1), and the channel penetrates the inner rod (1) along the length direction of the inner rod (1); a through hole (11) is formed on the rod wall of the inner rod (1), the channel is connected to the through hole (11), and the through hole (11) corresponds to the position of the expansion portion (21).
2. An expansion anchor structure according to claim 1, characterized in that: The expansion portion (21) comprises a slice (211), and the slice (211) is configured to be able to bend away from the inner rod (1) when the other end of the outer rod (2) is close to the anchor head (3).
3. The expansion anchor structure according to claim 2, characterized in that: The number of the slices (211) is not less than two, each of the slices (211) is arranged along the length direction of the outer rod (2), and each of the slices (211) is spliced together to cover the inner rod (1).
4. The expansion anchor structure according to claim 1, characterized in that: It also comprises a first locking member (4), and a second locking member (12) is arranged on the inner rod (1); when the other end of the outer rod (2) is close to the anchor head (3), the first locking member (4) can be connected with the second locking member (12) to lock the position of the outer rod (2).
5. The expansion anchor structure according to claim 4, characterized in that: The first locking piece (4) is a nut, and the second locking piece (12) is a thread, and the thread is distributed on the rod wall of the inner rod (1).
6. The expansion anchor structure according to claim 1, characterized in that: The number of the through holes (11) is no less than two, and the through holes (11) are evenly distributed along the length direction of the outer rod (2).
7. The expansion anchor structure according to claim 1, characterized in that: The anchor head (3) is a conical structure.
8. The expansion anchor structure according to claim 7, characterized in that: The bottom diameter of the anchor head (3) is equal to the diameter of the outer rod (2).
9. The expansion anchor structure according to claim 1, characterized in that: The length of the inner rod (1) is greater than that of the outer rod (2), so that the end of the inner rod (1) away from the anchor head (3) can extend out of the outer rod (2).
10. The expansion anchor structure according to claim 1, characterized in that: The wall thickness of the inner rod (1) is greater than the wall thickness of the outer rod (2).