A grouting anchor cable device

Abstract

This utility model discloses a grouting anchor protection device, including a grouting head and a grouting anchor body, belonging to the field of geotechnical engineering and underground mine support technology. The grouting head and the grouting anchor body are connected by a necking and pressing connection through an anti-detachment protection device. The anti-detachment protection device includes a cylindrical section and an annular boss. The annular boss is disposed at one end of the cylindrical section and can cooperate with the annular groove of the grouting head. The cylindrical section is sleeved on the outside of the grouting anchor body, so that the stress borne by the connection area is evenly distributed, significantly improving the overall impact resistance and preventing local loosening.

Description

Technical Field

[0001] This utility model belongs to the field of geotechnical engineering and underground mine support technology, specifically a grouting anchor cable device. Background Technology

[0002] Hollow grouting anchors are widely used in geotechnical engineering and underground mine support construction due to their efficient and convenient grouting performance. However, conventional hollow grouting anchor devices typically use a simple interference fit to connect the grouting head and the anchor body. Since the hollow grouting anchor body is generally formed from rolled material, its internal hole diameter inevitably has a certain degree of dimensional inhomogeneity during the manufacturing process, making it difficult to achieve the ideal tightness of the interference fit between the grouting head and the anchor body.

[0003] In actual use, once subjected to high grouting pressure or external forces such as impact and vibration at the construction site, the grouting head is very likely to detach from the end of the anchor cable, causing grout leakage, which seriously affects the smooth progress of grouting construction and the anchoring effect of the anchor cable. At the same time, the end of the anchor cable is often subjected to various external forces at the construction site, such as bumps during transportation, vibration or impact during installation, which can easily cause the steel wire at the end of the anchor cable to break, resulting in the failure and scrapping of the entire anchor cable. This not only causes serious waste of construction materials, but also increases project costs and construction safety risks.

[0004] Current improvements typically involve applying sealant to the connection between the grouting head and the anchor cable for reinforcement. However, this sealant is prone to aging and cracking under long-term high-pressure grouting conditions or vibration, making it difficult to maintain connection stability. This results in the grouting head still detaching after a period of use, and the problem of wire breakage at the anchor cable end remains unresolved. Furthermore, there is currently a lack of effective devices that can completely solve these problems, especially those that fail to achieve a long-term reliable mechanical locking connection through structural design. Therefore, there is an urgent need for a simple, reliable, and durable grouting anchor cable device to effectively prevent grouting head detachment and wire breakage at the anchor cable end, ensuring long-term stable operation of the grouting anchor cable, reducing engineering safety risks, and saving costs. Utility Model Content

[0005] To address the issue that existing geotechnical engineering and underground mine support systems rely on auxiliary methods such as applying sealant to the connection between the grouting head and the anchor cable for reinforcement, but the sealant is prone to aging and cracking under long-term high-pressure grouting environments or long-term vibration, making it difficult to continuously ensure the stability of the connection, resulting in the grouting head still having the risk of falling off after a period of use and the steel wire at the end of the anchor cable scattering, a grouting anchor cable device is provided.

[0006] This utility model is achieved through the following technical solution: A grouting anchor protection device includes a grouting head and a grouting anchor body. The grouting head and the grouting anchor body are connected by a necking and crimping anti-loosening protection device. The anti-loosening protection device includes a cylindrical section and an annular boss. The annular boss is disposed at one end of the cylindrical section and can cooperate with the annular groove of the grouting head. The cylindrical section is sleeved on the outside of the grouting anchor body, so that the stress borne by the connection area is evenly distributed, significantly improving the overall impact resistance and preventing local loosening.

[0007] A further improvement of this utility model is that the inner diameter of the annular boss is smaller than the inner diameter of the cylindrical section. This design can effectively achieve precise positioning and fixation of the grouting head by the annular boss, while the cylindrical section can ensure that the grouting anchor cable body receives good external support and protection, thereby achieving a double anti-detachment protection effect.

[0008] A further improvement of this utility model is that the inner diameter of the annular boss is specifically designed to be 17.35mm. This size has been repeatedly optimized and tested in practice, which can effectively improve the fitting accuracy with the grouting head and avoid connection failure caused by local loosening during construction.

[0009] A further improvement of this utility model is that the inner diameter of the cylindrical section is 27.35mm, which, combined with the outer diameter of the grouting anchor cable, effectively enhances the overall support and coverage strength of the connection area and significantly reduces the risk of the steel wire at the end of the anchor cable scattering due to impact during construction.

[0010] A further improvement of this utility model is that the outer diameter of the anti-detachment protection device is 31.35mm. This size is moderate, which not only provides effective protection for the anchor cable connection, but also facilitates quick installation and clamping by on-site operators, thereby improving on-site construction efficiency.

[0011] A further improvement of this utility model is that the anti-detachment protection device is 30mm long. This length is appropriately designed to fully cover and protect the connection area at the end of the anchor cable, avoiding insufficient protection due to excessive length or material waste due to excessive length, thus achieving a reasonable balance between protection performance and economy.

[0012] A further improvement of this utility model is that the interior of the grouting anchor body is a hollow structure to allow the grout to pass through smoothly. This structure not only improves the efficiency of grouting operations, but also ensures that the grout is evenly filled into the end area of ​​the anchor cable, thereby improving the overall anchoring effect of the anchor cable.

[0013] A further improvement of this utility model is that the anti-detachment protection device is made of alloy steel, which has high strength and toughness, can effectively resist impact and wear in complex construction environments, extend the service life of the device, and improve the overall safety and reliability of the anchor cable.

[0014] A further improvement of this utility model is that the outer surface of the anti-detachment protection device is provided with an anti-rust coating, which significantly improves the anti-rust performance of the device in humid and corrosive environments, ensures the structural stability after long-term use, extends the service life, and reduces the cost and difficulty of subsequent maintenance.

[0015] A further improvement of this invention is that the thickness of the anti-rust coating is designed to be between 20-50 μm. This thickness range has been verified in practice, which can not only achieve effective anti-corrosion protection, but also keep the installation accuracy of the device unaffected by the coating thickness, thereby further ensuring the reliability and stability of the device installation.

[0016] As can be seen from the above technical solutions, the beneficial effects of this utility model are as follows: The grouting anchor cable device provided by this utility model achieves a mechanical locking connection with the grouting head and the grouting anchor cable body through an anti-detachment protection device, which can effectively prevent the grouting head from falling off or the steel wire at the end of the anchor cable from scattering due to vibration and impact during high-pressure grouting and construction. At the same time, the device has a simple and reasonable structural design, is quick and convenient to install, and greatly improves construction efficiency. Field verification shows that this device can significantly improve the stability and reliability of the anchor cable end connection, avoid material waste caused by connection failure, reduce the risk of engineering safety accidents, and thus ensure the stability, safety and economy of the project, and has good practical application value. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the drawings used in the description 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.

[0018] Figure 1 This is a schematic diagram of the cross-sectional structure of the grouting anchor cable device before clamping, which is a specific embodiment of this utility model.

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the grouting anchor cable device after it has been clamped, according to a specific embodiment of this utility model.

[0020] Figure 3 This is a side cross-sectional view of the anti-detachment protection device according to a specific embodiment of the present invention.

[0021] Figure 4 This is a front structural diagram of the anti-detachment protection device according to a specific embodiment of the present utility model.

[0022] In the attached diagram: 1. Grouting head; 2. Grouting anchor cable body; 3. Anti-detachment protection device; 31. Annular boss; 32. Cylindrical section. Detailed Implementation

[0023] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0024] refer to Figure 1-4As shown, this utility model provides a grouting anchor cable device, belonging to the field of geotechnical engineering and underground mine support technology. It includes a grouting head 1 and a grouting anchor cable body 2. The grouting head 1 and the grouting anchor cable body 2 are connected by a necking and crimping anti-detachment protection device 3. The anti-detachment protection device 3 includes a cylindrical section 32 and an annular boss 31. The annular boss 31 is disposed at one end of the cylindrical section 32 and can cooperate with the annular groove of the grouting head 1. The cylindrical section 32 is sleeved on the outside of the grouting anchor cable body 2. In actual use, the end of the grouting anchor body 2 is first thoroughly cleaned to ensure that the surface is free of oil and impurities so as to achieve good fit of subsequent components. Then, the grouting head 1 is inserted into the grouting anchor body 2 in the predetermined position, so that the grouting head 1 and the grouting anchor body 2 initially form a connection structure. Next, the anti-detachment protection device 3 is fitted onto the end of the grouting anchor body 2 and the position is adjusted so that the annular boss 31 of the anti-detachment protection device 3 is accurately aligned with the annular groove of the grouting head 1. At the same time, the cylindrical section 32 can evenly cover the outer surface of the grouting anchor body 2. Then, the anti-detachment protection device 3 is evenly pressed using the necking and pressing technology, so that its inner cavity is tightly combined with the grouting head 1 and the grouting anchor body 2 after plastic deformation. This forms a solid mechanical locking system in the structure, ensuring that the grouting head 1 can always maintain a stable connection with the grouting anchor body 2 during the grouting process and subsequent construction, even when subjected to vibration, impact or high-pressure grouting, preventing the grouting head 1 from falling off and the steel wire at the end of the anchor cable from scattering. After on-site construction verification, the device maintained stable operation under high-pressure grouting and long-term stress conditions. During grouting, the grout flowed smoothly along the inside of the anchor cable, while the anti-detachment protection device 3 effectively dispersed local stress caused by external vibration and impact, ensuring that the entire connection structure remained tightly interlocked, thus significantly reducing the risk of construction accidents caused by weak connections. Practice has proven that using this device, even in environments subjected to continuous construction vibration and grouting pressure, it effectively prevented the grouting head 1 from separating from the grouting anchor cable 2, achieving efficient grout transfer and reliable protection of the anchor cable ends. This saved material costs and improved overall project safety and construction efficiency, demonstrating significant economic and social benefits. In summary, this grouting anchor cable device, by combining the anti-detachment protection device 3 with the grouting head 1 and the grouting anchor cable 2, fully leverages the synergistic protective effects of each component, providing a simple, reliable, efficient, and energy-saving solution for engineering construction.

[0025] The inner diameter of the annular boss 31 is smaller than that of the cylindrical section 32. This structure, through the differentiated design of the inner diameters of the annular boss 31 and the cylindrical section 32, allows the smaller inner diameter of the annular boss 31 (17.35mm) to achieve a high-precision, tight fit with the annular groove of the grouting head 1, forming a stable mechanical interlocking effect. Meanwhile, the larger inner diameter of the cylindrical section 32 (27.35mm) allows for a full fit and uniform coverage with the outer diameter of the grouting anchor cable body 2, effectively enhancing the overall stability and reliability of the connection section. Through this optimized structural design, the device can maintain stable connection even under vibration, impact, and high-pressure grouting conditions in the construction environment, effectively preventing loosening or detachment of the connection between the grouting head 1 and the grouting anchor cable body 2 due to localized stress concentration. It also significantly improves the protection effect at the end of the grouting anchor cable body 2, reduces the risk of wire breakage at the anchor cable end, extends the service life of the anchor cable, reduces construction material waste and maintenance costs, and achieves good economic and safety benefits.

[0026] The annular boss 31 has an inner diameter of 17.35 mm, the cylindrical section 32 has an inner diameter of 27.35 mm, and the anti-detachment protection device 3 has an outer diameter of 31.35 mm and a length of 30 mm. Through this precise dimensional design, the anti-detachment protection device 3 can achieve a high-precision fit with the grouting head 1 and the grouting anchor body 2. The annular boss 31 and the annular groove of the grouting head 1 are precisely engaged, ensuring that the grouting head 1 is securely fixed and will not loosen due to external construction pressure or vibration. The cylindrical section 32, with its larger inner diameter, effectively covers the outer surface of the grouting anchor body 2, forming a stable structure after installation. A fixed support and protective layer further enhances the structural strength of the anchor cable end. The outer diameter of the anti-detachment protection device 3 is designed to be 31.35mm, balancing material strength and overall device weight control. This ensures that the device is evenly stressed and reliably fixed during the clamping deformation process, while also facilitating quick installation and operation by on-site personnel. The overall length of the device is designed to be 30mm, allowing for reasonable coverage of the connection area between the grouting head 1 and the anchor cable end during actual installation. This avoids problems such as installation difficulties or insufficient protection caused by excessive length or length, effectively improving the convenience and reliability of construction. Through this optimized size design, the entire protection device has a compact structure, moderate weight, and is easy and quick to install. In actual construction environments, it can significantly improve connection stability, effectively reducing the occurrence of failures such as grouting head 1 detachment and end wire scattering caused by weak connections. This significantly improves project safety, reduces subsequent maintenance and material waste costs, and achieves good economic and social benefits. The interior of the grouting anchor cable body 2 is a hollow structure through which grout is supplied.

[0027] The anti-detachment protection device 3 is made of alloy steel. Utilizing the high strength and good toughness of alloy steel, the anti-detachment protection device 3 still has good mechanical properties and stability under long-term pressure and high-intensity impact conditions. It can effectively resist the impact and wear in the underground or geotechnical construction environment, thereby significantly extending the service life of the anti-detachment protection device 3 and the entire grouting anchor cable. Meanwhile, to further improve the durability of the device in humid and highly corrosive environments, a 20-50μm thick anti-rust coating is specially applied to the outer surface of the anti-detachment protection device 3. This anti-rust coating effectively prevents corrosive media such as moisture, oxygen, and acidic / alkaline environments from directly contacting the metal surface of the anti-detachment protection device 3, thereby significantly reducing its surface corrosion rate, extending the maintenance cycle, reducing subsequent maintenance costs, and ensuring long-term reliable operation of the device. The coating thickness of 20-50μm is the optimal range derived from long-term engineering practice experience. Too thin a coating would not effectively prevent corrosion, while too thick a coating would affect the dimensional accuracy of the outer surface of the device and the mechanical assembly effect. The coating thickness within the above range can effectively prevent rust without affecting the assembly accuracy between the anti-detachment protection device 3 and the grouting head 1 and the grouting anchor body 2, ensuring the overall installation effect and connection reliability of the device. Practical engineering applications show that the anti-detachment protection device 3, using this material and coating structure combination, can effectively reduce the negative impact of harsh construction site environments on the device, reduce engineering risks and material losses caused by device corrosion damage, thereby significantly improving the overall safety, economic benefits, and utilization efficiency of the project.

[0028] Taking the underground construction project of Huainan Mining as an example, the project plans to use 1,000 hollow grouting anchor cables for underground roadway support. In previous construction, traditional interference fit grouting anchor cable devices have generally suffered from grouting head detachment and steel wire scattering at the anchor cable ends due to various factors such as uneven inner diameter of the anchor cable body, harsh construction environment, high-pressure grouting, and construction vibration and impact. This results in an average of about 20 anchor cables being scrapped per thousand cables. This not only directly causes material waste and increases construction costs, but also seriously affects the construction progress and project quality, and even poses a threat to the safety of on-site personnel. After adopting the anti-detachment protection device provided by this utility model, the device firmly connects the grouting head and the anchor cable body through a precise structural design and mechanical locking method, effectively eliminating the problems of grouting head detachment and steel wire scattering during construction, achieving zero loss for every 1000 anchor cables, greatly reducing the risk of safety accidents caused by poor anchoring effect, fully protecting the personal safety of construction personnel, significantly enhancing the stability and safety of the overall structure of the underground project, demonstrating outstanding economic and social benefits, and having broad application prospects and promotion value.

[0029] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A grouting anchor cable device, comprising a grouting head (1) and a grouting anchor cable body (2), characterized in that: The grouting head (1) and the grouting anchor body (2) are connected by a necking and crimping device (3); the anti-detachment protection device (3) includes a cylindrical section (32) and an annular boss (31); the annular boss (31) is located at one end of the cylindrical section (32) and the annular boss (31) can cooperate with the annular groove of the grouting head (1); the cylindrical section (32) is sleeved on the outside of the grouting anchor body (2).

2. The grouting anchor cable device according to claim 1, characterized in that: The inner diameter of the annular boss (31) is smaller than the inner diameter of the cylindrical section (32).

3. The grouting anchor cable device according to claim 2, characterized in that: The inner diameter of the annular boss (31) is 17.35 mm.

4. The grouting anchor cable device according to claim 3, characterized in that: The inner diameter of the cylindrical section (32) is 27.35 mm.

5. The grouting anchor cable device according to claim 1, characterized in that: The outer diameter of the anti-detachment protection device (3) is 31.35 mm.

6. The grouting anchor cable device according to claim 5, characterized in that: The anti-detachment protection device (3) is 30mm long.

7. The grouting anchor cable device according to claim 1, characterized in that: The interior of the grouting anchor body (2) is a hollow structure through which the grout is supplied.

8. The grouting anchor cable device according to claim 1, characterized in that: The anti-detachment protection device (3) is made of alloy steel.

9. The grouting anchor cable device according to claim 8, characterized in that: The outer surface of the anti-detachment protection device (3) is provided with an anti-rust coating.

10. The grouting anchor cable device according to claim 9, characterized in that: The thickness of the anti-rust coating is 20-50 μm.

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