Stress self-balancing tensile-inflation fish-shaped anchor head

Abstract

This invention discloses a stress-self-balancing, expansion-type fish-shaped anchor head, belonging to the field of soil anchoring technology, which solves the technical problems of conventional anchor heads, such as unsmooth installation, weak stress self-adjustment ability, and low anchoring force. It includes a fish-shaped anchor head and an anchor cable connected to it. The fish-shaped anchor head has opposing head and tail shells. The head shell is generally conical, and the tail shell is generally trapezoidal frustum. The outer sidewalls of the head and tail shells are smoothly connected. An elastic ring is horizontally arranged inside the tail shell, and a pressure plate is connected to the inner edge of the elastic ring. The anchor cable passes through the pressure plate and is fixed inside the head shell by a hoop. This stress-self-balancing, expansion-type fish-shaped anchor head is more applicable to various fields, easy to install, and has good anchoring performance.

Description

Technical Field

[0001] This invention relates to the field of soil anchoring technology, specifically to a stress-self-balancing tensile expansion type fish-shaped anchor head. Background Technology

[0002] Prestressed anchor cables are an effective construction method for improving the overall integrity of slopes, effectively controlling rock mass displacement, and promoting their stability. They are widely used in various slope engineering projects. When an anchor cable is subjected to external force, the force is transferred to the load-bearing body at the anchorage end through the free section of the anchor cable, then to the grouting body through the interaction between the anchor cable and the grouting body, and finally to the soil and rock layers through the interaction between the anchor body and the contacting soil and rock. Therefore, the anchoring force of the load-bearing body and the grouting body at the anchorage end is crucial to the load-bearing capacity of the anchor cable. The overall structure of the anchor head has a significant impact on the pull-out resistance of the anchorage section. However, traditional regular anchor head shapes may result in insufficient anchoring force.

[0003] Conventional anchor heads typically have a conical head shell and a cylindrical tail shell, resulting in a simple and uniform shape. This shape leads to greater resistance when the anchor cable passes through the borehole, making the installation process less smooth and time-consuming. Furthermore, the limited contact area between the anchor head and the anchor body results in a smaller anchoring force. Conventional anchor heads also have weak stress self-adjustment capabilities, making them prone to structural deformation under stress and easily damaged.

[0004] Therefore, an anchor head with high anchoring force and stress self-adjustment is needed to improve the anchoring force of the anchor cable and extend the service life of the anchor head. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a stress-self-balancing tensile expansion type fish-shaped anchor head.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The present invention provides a stress self-balancing tensile expansion type fish-shaped anchor head, including a fish-shaped anchor head and an anchor cable connected to the fish-shaped anchor head, characterized in that the fish-shaped anchor head has a head shell and a tail shell, the head shell is generally conical, the tail shell is generally trapezoidal frustum structure, and the outer sidewalls of the head shell and the tail shell are smoothly connected.

[0008] An elastic ring is horizontally arranged inside the tail housing, and a pressure plate is connected to the inner edge of the elastic ring. The anchor cable passes through the pressure plate and is fixed inside the head housing by a hoop.

[0009] The technical effect of adopting the above technical solution is as follows: setting up a head shell and a tail shell, and connecting the head shell and the tail shell to form a streamlined fish-shaped anchor head structure, makes the anchor cable pass through the borehole more quickly and smoothly, which facilitates the installation of the anchor cable.

[0010] During stress pull-out, the stress is transmitted along the anchor cable to the bearing plate, and further to the elastic ring, causing elastic deformation of the elastic ring. This reduces the stress transmission to the anchor head structure, thereby mitigating damage to the anchor head structure, achieving stress self-regulation, and thus extending the service life of the anchor head.

[0011] Optionally or preferably, the tail housing sidewall is provided with a first anchor claw, and the first anchor claw forms a target angle α with the tail housing.

[0012] Optionally or preferably, the tail housing is provided with a connecting portion at one end away from the head housing, the connecting portion being used to fix the anchor cable; a second anchor claw is provided on the side wall of the connecting portion, the second anchor claw forming a target angle β with the connecting portion.

[0013] Optional or preferred, 30°≤α≤60°, 30°≤β≤60°.

[0014] The technical effect of adopting the above technical solution is that by simultaneously setting two sets of anchor claws on the tail shell and the connecting part to cut into the anchor body, a greater pull-back force is provided for the anchor head, thereby increasing the pull-out resistance of the anchor cable.

[0015] Optionally or preferably, multiple slits are formed radially on the elastic ring, and deformation units are formed between adjacent slits; the deformation units are used to reduce the stress from the bearing plate.

[0016] Optionally or preferably, the upper edge of the deformation unit extends outward and forms a protrusion.

[0017] Based on the above technical solution, the present invention can produce at least the following technical effects:

[0018] (1) The stress self-balancing expansion type fish-shaped anchor head provided by the present invention is a streamlined fish-shaped anchor head structure formed by setting a head shell and a tail shell and connecting the head shell and the tail shell, so that the anchor cable can pass through the hole more quickly and smoothly, which facilitates the installation of the anchor cable.

[0019] (2) The fish-shaped structure of the fish-shaped anchor head makes its contact area with the adjacent anchor body larger, and together with the first and second anchor claws set on the tail shell, the fish-shaped anchor head can provide sufficient anchoring force.

[0020] (3) The first and second anchor claws are inclinedly set on the tail shell, which makes the anchoring force of the anchor head sufficient and greatly increases the pull-out resistance of the anchor cable anchoring section, playing an important role in slope reinforcement work.

[0021] (4) By setting an elastic ring, when stress is pulled, the stress is transmitted along the anchor cable to the bearing plate and further to the elastic ring, causing the elastic ring to deform elastically, reducing the stress transmission to the anchor head structure, thereby reducing the damage to the anchor head structure, realizing stress self-adjustment, and thus extending the service life of the anchor head. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the stress self-balancing tensile expansion type fish-shaped anchor head arrangement structure of the present invention;

[0023] Figure 2 This is a force analysis diagram of the self-balancing, tensile-expansion fish-shaped anchor head of the present invention under working conditions;

[0024] Figure 3 This is a partial structural schematic diagram of the fish-shaped anchor head in the stress self-balancing expansion type fish-shaped anchor head of the present invention;

[0025] Figure 4 This is a schematic diagram of the elastic ring in the stress-self-balancing expansion type fish-shaped anchor head of the present invention.

[0026] In the figure: 1. Anchor cable; 2. Fish-shaped anchor head; 21. Head shell; 22. Tail shell; 3. Elastic ring; 31. Deformation unit; 4. Pressure plate; 5. Hoop ring; 6. First anchor claw; 7. Connecting part; 8. Second anchor claw. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] Example

[0029] Please see Figures 1 to 4 A stress-self-balancing expansion type fish-shaped anchor head includes a fish-shaped anchor head 2 and an anchor cable 1 connected to the anchor head 2. In order to improve the installation performance and anchoring performance of the anchor head and the anchor cable 1, in this embodiment, the fish-shaped anchor head 2 includes a head shell 21 and a tail shell 22. The head shell 21 and the tail shell 22 are connected by a threaded connection mechanism. The outer sidewalls of the head shell 21 and the tail shell 22 after connection form a streamlined fish-shaped structure. The fish-shaped structure can reduce the resistance encountered by the anchor head when the anchor cable passes through the hole, and can quickly and smoothly reach the bottom of the hole, thereby reducing the installation time.

[0030] In this embodiment, the head shell 21 is generally conical, and the tail shell 22 is generally trapezoidal frustum.

[0031] Since the tail shell 22 is arranged in a trapezoidal frustum shape, it is understandable that the end of the tail shell 22 that is relatively far away from the head shell 21 is gradually widened. The gradually widened structure increases the contact area between the anchor head and the anchor body, thereby improving the anchoring performance.

[0032] Furthermore, in this embodiment, a connecting portion 7 is provided at the end of the tail shell 22 away from the head shell 21, and the anchor cable 1 is connected to the inside of the fish-shaped anchor head 2 through the connecting portion 7; a plurality of first anchor claws 6 and second anchor claws 8 are respectively provided on the side wall of the tail shell 22 and the side wall of the connecting portion 7, and the first anchor claws 6 and the second anchor claws 8 form target angles α and β with the tail shell 22 and the connecting portion 7, respectively. After the two sets of anchor claws cut into the anchor body, they provide a greater pullback force for the anchor head, thereby increasing the pull-out resistance of the anchor cable. In this embodiment, the target angles α and β are both 45°.

[0033] In actual work, the stress situation of the anchor head is as follows: Figure 2 As shown in the figure, the arrows indicate the direction of the force at the current position; the force balance equation along the axial direction is:

[0034] F+F c =F t

[0035] Where F is the elastic recoil force provided by the free section of the steel strand, F = elastic deformation of the steel strand × elastic modulus of the steel strand;

[0036] F c F represents the bond strength between the anchor head and the anchor body. c It is directly proportional to the contact area between the anchor head and the anchor body;

[0037] F t This represents the tension force on anchor cable 1.

[0038] As can be seen from the above formula, when the strength of the reinforced rock mass and the length of the anchoring section are the same, the contact area of ​​the fish-shaped anchor head 2 structure provided by the present invention is larger, thereby improving the bonding force between the fish-shaped anchor head 2 and the anchor body. In addition, the retraction force provided by the two sets of anchor claws cutting into the anchor body greatly enhances the tensile force that can be borne within the strength range of the anchor cable 1, that is, the anchoring force of the anchor cable 1.

[0039] In this embodiment, an elastic ring 3 is horizontally arranged inside the tail shell 22, and a pressure plate 4 is connected to the inner edge of the elastic ring 3. The anchor cable 1 passes through the pressure plate 4 and is fixed inside the head shell 21 by a hoop 5.

[0040] The elastic ring 3 has multiple cracks along the radial direction, and 16 identical deformation units 31 are formed between adjacent cracks. The upper edges of the multiple deformation units 31 extend outward and form protrusions. The cracks do not completely penetrate the elastic ring 3, so that the root of the deformation unit 31 is relatively thin and can generate elastic deformation.

[0041] In actual operation, after the anchor cable is installed, it is pulled out. The stress is transmitted along the anchor cable 1 to the bearing plate 4 and the elastic ring 3 in sequence. Since the elastic ring 3 is composed of multiple deformation units 31, and the roots of multiple deformation units 31 are relatively thin, they can generate sufficient elastic deformation. When the stress is large, multiple deformation units 31 can offset part of the stress by generating elastic deformation, thereby reducing the effect of stress on the anchor head structure, and thus realizing stress self-adjustment of the anchor head and reducing stress damage to the anchor head.

[0042] Please continue reading. Figure 1 The stress-self-balancing expansion type fish-shaped anchor head provided by this invention, in use, separates the head shell 21 from the tail shell 22, inserts the prestressed anchor cable 1 into the cavity inside the tail shell 22 through the opening, passes through the through hole on the pressure plate 4 and is fixed by the hoop 5, and then connects the head shell 21 and the tail shell 22 with a threaded mechanism to form a fish-shaped integral structure and cuts it into the rock and soil. Figure 1 The shaded area in the middle section represents the anchoring section. When stress is pulled out, the stress is transmitted along the anchor cable 1 to the bearing plate 4, and further to the elastic ring 3, causing elastic deformation of multiple deformation units 31 in the elastic ring 3. This reduces the stress transmitted to the anchor head structure, thereby reducing the damage to the anchor head structure, achieving stress self-adjustment, and thus extending the service life of the anchor head.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stress-self-balancing tensile expansion type fish-shaped anchor head, comprising a fish-shaped anchor head (2) and an anchor cable (1) connected to the fish-shaped anchor head (2), characterized in that, The fish-shaped anchor head (2) has a head shell (21) and a tail shell (22) with opposite sides. The head shell (21) is generally conical in shape, and the tail shell (22) is generally trapezoidal frustum in shape. The outer sidewalls of the head shell (21) and the tail shell (22) are smoothly connected. An elastic ring (3) is horizontally arranged inside the tail housing (22), and a pressure plate (4) is connected to the inner edge of the elastic ring (3). The anchor cable (1) passes through the pressure plate (4) and is fixed inside the head housing (21) by a hoop (5). Multiple cracks are formed radially on the elastic ring (3), and deformation units (31) are formed between adjacent cracks; the deformation units (31) are used to reduce the stress from the bearing plate (4).

2. The stress-self-balancing tensile expansion type fish-shaped anchor head according to claim 1, characterized in that, The tail housing (22) is provided with a first anchor claw (6) on its side wall, and the first anchor claw (6) and the tail housing (22) form a target angle α.

3. The stress-self-balancing tensile expansion type fish-shaped anchor head according to claim 2, characterized in that, The tail housing (22) is provided with a connecting part (7) at one end away from the head housing (21), the connecting part (7) is used to fix the anchor cable (1); the side wall of the connecting part (7) is provided with a second anchor claw (8), and a target angle β is formed between the second anchor claw (8) and the connecting part (7).

4. The stress-self-balancing tensile expansion type fish-shaped anchor head according to claim 3, characterized in that, 30°≤α≤60°，30°≤β≤60°。 5. The stress-self-balancing tensile expansion type fish-shaped anchor head according to claim 4, characterized in that, The target angle α is 45°, and the target angle β is 45°.

6. The stress-self-balancing tensile expansion type fish-shaped anchor head according to claim 1, characterized in that, The upper edge of the deformation unit (31) extends outward and forms a protrusion.

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