Anchor rod with stress relaxation material

Abstract

The invention provides an anchor rod with a stress relaxation material, which comprises a rod body, one end of the rod body is provided with an anchoring end, the other end of the rod body is provided with a free end, the anchoring end of the rod body is fixedly provided with an anchor rod head, the free end of the rod body is provided with a mounting part, and the mounting part is used for connecting an external support structure. And a matching piece is arranged between the mounting piece and the anchor rod head and is mounted on the rod body. Through cooperative arrangement of all the structures, when a rock-soil body deforms to generate tensile stress on the anchor rod, the stress relaxation section can enable the internal stress to be remarkably attenuated along with time under the condition that the strain is basically unchanged, so that concentrated stress is actively dissipated, overload fracture of the anchor rod caused by continuous accumulation of stress is avoided, and the service life of the anchor rod is prolonged. And the overall stress level of a reinforced rock-soil body can be effectively reduced, and the long-term stability and safety of a project are remarkably improved.

Description

Technical Field

[0001] This invention relates to the technical field of geotechnical engineering, specifically to an anchor bolt with stress relaxation material. Background Technology

[0002] In geotechnical engineering, anchor bolts are a commonly used method for soil and rock reinforcement, and are widely used in engineering scenarios such as slope protection, tunnel lining, and foundation pit reinforcement. During the operation of traditional anchor bolts, the stress on the anchor bolts may increase over time and with the deformation of the soil and rock. When the stress exceeds the design bearing capacity of the anchor bolts, it may cause the anchor bolts to fail, thereby affecting the stability of the engineering structure. Currently, although there are some technologies for controlling anchor stress, most of them have problems such as complex structure, high cost or unsatisfactory effect. For example, some methods that adjust stress by adding anchor structural components not only increase construction difficulty and cost, but also may cause damage or failure of the added components during long-term use, affecting the overall performance. Therefore, based on the above problems, the present invention provides an anchor bolt with a stress relaxation material. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides an anchor bolt with a stress-relaxation material, which solves the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: An anchor bolt with stress relaxation material includes a rod body, one end of which is provided with an anchoring end and the other end of which is provided with a free end. An anchor head is fixedly provided at the anchoring end of the rod body, and an installation component is installed on the free end of the rod body. The installation component is used to connect to an external support structure, and a mating component is provided between the installation component and the anchor head. The mating component is installed on the rod body.

[0005] Furthermore, a spiral groove is formed on the outer surface of the anchor head, and the rod body is made of high-strength steel.

[0006] Furthermore, the mounting component includes a steel pad with a circular mounting hole through it. The rod is installed in the circular mounting hole, and the steel pad has a plurality of mating holes evenly distributed therein. Each of the mating holes is fitted with an internal hexagonal fastener. The steel pad is fixedly connected to the external support structure by a plurality of internal hexagonal fasteners.

[0007] Furthermore, the mating component includes a stress relaxation material layer that surrounds the rod and is tightly bonded to it. The stress relaxation material is a polymer elastomer material with good stress relaxation performance and durability. A connecting transition layer is provided between the stress relaxation material layer and the rod, and the connecting transition layer material is a modified polyurethane elastomer. A protective sleeve is fixedly fitted on the outer surface of the stress relaxation material layer. The protective sleeve is a corrosion-resistant plastic sleeve, and the protective sleeve is sealed to the rod body with sealant.

[0008] Furthermore, the stress relaxation material is made of fluorosilicone rubber.

[0009] Furthermore, the outer surface of the protective sleeve is provided with an anti-slip texture, which is a diamond-shaped grid.

[0010] This invention provides an anchor bolt with a stress-relaxation material. Compared with the prior art, it has the following advantages: The core of this invention, the fluorosilicone rubber stress relaxation material layer, can slowly plastically deform when the stress exceeds a threshold, actively releasing excess stress. This fundamentally solves the problem of overload fracture caused by stress concentration in traditional anchor bolts, and significantly reduces the risk of anchor bolt failure. The modified polyurethane elastomer connecting transition layer of this invention effectively improves the interfacial bonding performance between the steel rod body and the rubber stress relaxation layer, alleviates interfacial stress concentration, prevents the two layers of materials from peeling off, ensures stable force transmission, and improves the overall mechanical performance and structural reliability of the anchor rod. The anti-corrosion plastic protective sleeve and sealant sealing structure of this invention can effectively isolate the erosion of moisture and chemical media, and avoid corrosion and aging of the stress relaxation material layer and the rod body; at the same time, the anti-slip texture enhances the friction between the anchor rod and the rock and soil, further improving the anchoring stability. Under the dual effect, the service life of the anchor rod is greatly extended. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 A schematic diagram of the structural connection in a front cross-section of the present invention is shown; Figure 2 A top-view cross-sectional structural connection diagram of the present invention is shown; The figure shows: 1. Anchor head; 2. Rod body; 3. Connecting transition layer; 4. Stress relaxation material layer; 5. Protective sleeve; 6. Steel pad; 7. Hex socket fastener. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0014] To address the technical problems in the background art, the following anchor bolt with a stress-relaxation material is provided: Combination Figure 1-2 As shown, the present invention provides an anchor rod with stress relaxation material, including a rod body 2, one end of the rod body 2 is provided with an anchoring end, the other end of the rod body 2 is provided with a free end, the anchoring end of the rod body 2 is fixedly provided with an anchor head 1, and an installation component is installed on the free end of the rod body 2. The installation component is used to connect to the external support structure, and a mating component is provided between the installation component and the anchor head 1. The mating component is installed on the rod body 2.

[0015] The outer surface of the anchor head 1 is provided with a spiral groove, and the rod body 2 is made of high-strength steel.

[0016] The outer surface of the anchor head 1 is machined with a spiral groove. During the drilling process of the anchor bolt into the rock and soil, the spiral groove can tightly engage with the rock and soil of the hole wall to form a preliminary mechanical anchoring force. The rod body 2 is made of high-strength steel and has excellent tensile strength and toughness. It can directly bear the tensile stress generated by the deformation of the rock and soil and is the core structure for anchor bolt bearing, meeting the basic mechanical requirements of rock and soil reinforcement.

[0017] The mounting components include a steel pad 6, on which a circular mounting hole is formed. The rod 2 is installed in the circular mounting hole. The steel pad 6 also has several mating holes evenly spaced. Each mating hole is fitted with an internal hexagonal fastener 7. The steel pad 6 is fixedly connected to the external support structure through several internal hexagonal fasteners 7.

[0018] The mating component includes a stress relaxation material layer 4, which surrounds the rod body 2 and is tightly bonded to it. The stress relaxation material is a high-molecular elastomer material with excellent stress relaxation performance and durability. When the anchor rod is subjected to stress, the stress relaxation material can undergo slow plastic deformation under a certain stress threshold, thereby releasing some stress. When the soil and rock undergo deformation such as creep and settlement, it will generate continuous tensile stress on the anchor rod. When the stress value does not reach the stress threshold of the material, the stress relaxation material layer remains stable and shares the load with the rod body. When the stress value exceeds the set threshold, the fluorosilicone rubber will undergo slow plastic deformation, releasing some of the excess stress through its own deformation, avoiding stress concentration in local areas of the rod body. At the same time, by adjusting the material ratio of the fluorosilicone rubber (the material ratio can be manufactured according to the usage requirements, with actual manufacturing as the main factor), the speed and degree of stress relaxation can be precisely customized to match the creep characteristics of the soil and rock in a specific project, achieving dynamic adaptive adjustment of stress.

[0019] Furthermore, a connecting transition layer 3 is provided between the stress relaxation material layer 4 and the rod body 2. The material of the connecting transition layer 3 is a modified polyurethane elastomer. The connecting transition layer 3 has good adhesion and flexibility. On the one hand, it can firmly bond the stress relaxation material layer and the high-strength steel rod body into a whole, ensuring the effective transmission of force. On the other hand, it can alleviate the stress concentration phenomenon at the interface between steel and rubber, two materials with different moduli, and avoid interface peeling caused by excessive modulus difference, thereby improving the overall mechanical performance of the anchor rod.

[0020] A protective sleeve 5 is fixedly fitted onto the outer surface of the stress relaxation material layer 4. The protective sleeve 5 is a corrosion-resistant plastic sleeve, and the protective sleeve 5 is sealed to the rod body 2 with sealant. The stress relaxation material is made of fluorosilicone rubber. This material has good stress relaxation performance and durability. The outer surface of the protective sleeve 5 is provided with anti-slip texture, which is a diamond grid pattern. This increases the friction between the protective sleeve and the surrounding soil or other contact objects, improves the anchoring stability of the anchor rod in the soil, and prevents the anchor rod from sliding or shifting during the stress process. The protective sleeve 5 has good sealing performance and can effectively prevent moisture and chemicals from entering the stress relaxation material layer 4.

[0021] By incorporating stress relaxation materials, the stress borne by the anchor bolt can be automatically adjusted, effectively avoiding stress concentration, preventing overload fracture, improving the long-term stability of the anchor bolt in the soil and rock mass, reducing the risk of anchor bolt failure due to excessive stress, and ensuring the safety of the engineering structure.

[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0023] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An anchor bolt with a stress relaxation material, characterized in that: The rod (2) includes a rod body (2), one end of which is provided with an anchor end and the other end of which is provided with a free end. An anchor head (1) is fixedly provided at the anchor end of the rod body (2). An installation component is installed on the free end of the rod body (2). The installation component is used to connect to the external support structure. A mating component is provided between the installation component and the anchor head (1). The mating component is installed on the rod body (2).

2. An anchor bolt with stress relaxation material according to claim 1, characterized in that: The outer surface of the anchor head (1) is provided with a spiral groove, and the rod body (2) is made of high-strength steel.

3. An anchor bolt with stress relaxation material according to claim 1, characterized in that: The mounting component includes a steel pad (6), on which a circular mounting hole is provided. The rod (2) is installed in the circular mounting hole. The steel pad (6) is provided with a number of mating holes evenly distributed. Each mating hole is provided with an internal hexagonal fastener (7). The steel pad (6) is fixedly connected to the external support structure by a number of internal hexagonal fasteners (7).

4. An anchor bolt with stress relaxation material according to claim 1, characterized in that: The fitting includes a stress relaxation material layer (4), which surrounds the rod (2) and is tightly bonded to the rod (2). The stress relaxation material is a polymer elastomer material with good stress relaxation performance and durability. A connecting transition layer (3) is provided between the stress relaxation material layer (4) and the rod (2). The connecting transition layer (3) is made of modified polyurethane elastomer. A protective sleeve (5) is fixedly fitted on the outer surface of the stress relaxation material layer (4). The protective sleeve (5) is a corrosion-resistant plastic sleeve, and the protective sleeve (5) is sealed with sealant to the rod body (2).

5. An anchor bolt with stress relaxation material according to claim 4, characterized in that: The stress relaxation material is made of fluorosilicone rubber.

6. An anchor bolt with stress relaxation material according to claim 4, characterized in that: The outer surface of the protective sleeve (5) is provided with anti-slip texture, which is a diamond-shaped grid.

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