Longitudinal straight-pulling self-expanding type joint anchor bolt

Abstract

The utility model relates to the technical field of fasteners, and provides a longitudinal straight-pull self-expansion type joint anchor bolt, which comprises a plurality of through grooves arranged at one end of an expansion pipe, the through grooves are circumferentially arranged, the expansion pipe is provided with a plurality of clamping parts, and the clamping parts are circumferentially arranged and are used for being clamped with the external environment. By means of the technical scheme, the problem that in the prior art, when different top wall materials are used, the good anchoring effect is often difficult to achieve is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, in particular to a longitudinal straight-pull self-expandable joint anchor bolt. Background Art

[0002] In the field of building installation, strong and reliable longitudinal straight-pull self-expanding anchor bolts are required for the installation of suspended ceilings and other suspended components to ensure safety and stability. Traditional longitudinal straight-pull self-expanding anchor bolts may lack sufficient anchoring force to support heavier loads. Furthermore, the varying materials and structures of different building ceilings pose challenges to the versatility and applicability of longitudinal straight-pull self-expanding anchor bolts. During the installation process, longitudinal straight-pull self-expanding anchor bolts are also expected to be more convenient and efficient, reducing adjustment and calibration work.

[0003] Current longitudinal straight-pull, self-expanding joint anchors on the market often struggle to achieve effective anchoring when used with varying roof materials. They suffer from uneven anchoring force distribution, are prone to loosening due to vibration or external forces during use, and are cumbersome to install. Therefore, a new longitudinal straight-pull, self-expanding joint anchor design is needed to address these issues, improving anchoring force, enhancing stability, adapting to varying roof materials, and simplifying installation. Utility Model Content

[0004] The utility model proposes a longitudinal straight-pull self-expanding joint anchor bolt, which solves the problem in the related art that it is often difficult to achieve a good anchoring effect when facing different top wall materials.

[0005] The technical solution of the utility model is as follows:

[0006] Longitudinal straight pull self-expanding joint anchor bolt, including

[0007] One end of the expansion tube is provided with a through groove, and the through grooves are arranged in a plurality of circles. The expansion tube is provided with a clamping portion, and the clamping portion is arranged in a plurality of circles for clamping with the external environment.

[0008] As a further technical solution, the expansion tube has a clearance groove, which is located on one side of the clamping portion. The clamping portion is arc-shaped and bends toward a side away from the clearance groove.

[0009] As a further technical solution, the expansion tube has a deformation portion, and the deformation portion is arranged in a plurality of circles, and two adjacent deformation portions form the through groove in a straight line.

[0010] As a further technical solution, the clamping portion is located in the middle of the deformation portion.

[0011] As a further technical solution, the clamping portion is located between the deformation portion and the end portion of the expansion tube.

[0012] As a further technical solution, the clamping portion is an elastic clamping portion.

[0013] As a further technical solution, the end of the deformation portion has an arc-shaped inner concave portion.

[0014] As a further technical solution, the cross-sectional area of ​​the clamping portion gradually decreases from the expansion tube toward the end of the clamping portion.

[0015] As a further technical solution, both ends of the cross section of the clamping portion parallel to the axial direction of the expansion tube are acute-angled.

[0016] As a further technical solution, the angle between the bottom surface of the end of the clamping portion and the radial direction of the expansion tube is less than or equal to 90 degrees, and both ends of the expansion tube have the deformation portion.

[0017] The working principle and beneficial effects of the utility model are as follows:

[0018] In the present invention, one end of the expansion tube has a through groove, and the through grooves are arranged in a plurality of circumferential arrangements. The expansion tube also has a clamping portion, which is also arranged in a plurality of circumferential arrangements and is used to engage with the external environment. When the core rod is subjected to tension, the expansion tube needs to expand outward to increase the friction with the top wall of the building to achieve an anchoring effect. The provision of the through groove makes it easier for the expansion tube to deform when subjected to force, thereby making the expansion effect more significant. The plurality of circumferentially arranged through grooves can enable the expansion tube to expand evenly in all directions, ensuring a uniform distribution of the anchoring force. The clamping portion is used to engage with the external environment, further enhancing the stability of the expansion tube within the top wall of the building. After the expansion tube is expanded, the clamping portion and the structure of the top wall engage with each other to prevent the expansion tube from loosening or shifting when subjected to external forces. The circumferentially arranged clamping portions can provide clamping force in all directions, improving the reliability of the anchoring. The design of the through groove and the clamping portion works together to significantly improve the anchoring force of the expansion tube. This allows the longitudinal straight-pull self-expanding joint anchor to be more securely fixed to the building ceiling, withstanding greater tensile and shear forces. This enhanced anchoring force is particularly important for installations requiring heavy loads in suspended ceilings or suspended components. The clamping portion securely engages the external environment, enhancing the stability of the expansion tube and reducing the possibility of loosening of the longitudinal straight-pull self-expanding joint anchor due to vibration or external forces during use. This ensures safe and reliable installation and extends the service life of the longitudinal straight-pull self-expanding joint anchor. The through-slot and clamping portion design allows the expansion tube to better adapt to different building ceiling materials and structures, achieving excellent anchoring effectiveness for ceilings made of concrete, masonry, and other materials. This enhances the versatility and applicability of the longitudinal straight-pull self-expanding joint anchor, meeting diverse project requirements. The through-slot makes the expansion tube less deformable during installation, facilitating the insertion of the core rod and the application of tension to expand the tube. The clamping portion also stabilizes the expansion tube within the ceiling, reducing adjustments and calibration during installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The preferred embodiments will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0020] Figure 1 This is a schematic diagram of the structure of the utility model;

[0021] Figure 2 This is a structural diagram of another form of the expansion tube of the utility model;

[0022] Figure 3 This is a schematic structural diagram of Example 2 of the present utility model;

[0023] Figure 4 This is a structural diagram of another embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the expansion tube structure of another form of Example 2 of the present utility model.

[0025] In the figure: expansion tube-3, through groove-301, clamping part-302, clearance groove-303, deformation part-304, arc-shaped concave part-305. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0027] To simplify the drawings, only the parts relevant to the utility model are schematically shown in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically shown or labeled. In this document, "one" not only means "only one" but also "more than one," and "several" includes "two" and "more than two."

[0028] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0029] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0030] Example 1

[0031] Reference Figure 1~Figure 2 , which is the first embodiment of the present utility model, proposes that one end of the expansion tube 3 has a through groove 301, and the through groove 301 is arranged in a plurality of circles. The expansion tube 3 has a clamping portion 302, and the clamping portion 302 is arranged in a plurality of circles for clamping with the external environment.

[0032] In this embodiment, one end of the expansion tube 3 has a through groove 301, and the through grooves 301 are arranged in a plurality of circles. The expansion tube 3 also has a clamping portion 302, which is also arranged in a plurality of circles and is used to engage with the external environment. When the core rod 1 is subjected to tension, the expansion tube 3 needs to expand outward to increase the friction with the top wall of the building to achieve the anchoring effect. The provision of the through groove 301 makes it easier for the expansion tube 3 to deform when subjected to force, thereby making the expansion effect more significant. Several circumferentially arranged through grooves 301 can make the expansion tube 3 expand evenly in all directions, ensuring a uniform distribution of the anchoring force. The clamping portion 302 is used to engage with the external environment, further enhancing the stability of the expansion tube 3 within the top wall of the building. When the expansion tube 3 is expanded, the clamping portion 302 engages with the structure of the top wall to prevent the expansion tube 3 from loosening or shifting when subjected to external force. The circumferentially arranged clamping portion 302 can provide a clamping force in all directions, improving the reliability of the anchoring. The design of the through groove 301 and the clamping portion 302 works together to significantly improve the anchoring force of the expansion tube 3. This enables the longitudinal straight-pull self-expanding joint anchor bolt to be more firmly fixed to the top wall of the building and withstand greater tension and shear forces. This enhanced anchoring force is particularly important for ceiling installations or suspension installations that need to bear heavier loads. The clamping connection of the clamping portion 302 with the external environment increases the stability of the expansion tube 3 and reduces the possibility of the longitudinal straight-pull self-expanding joint anchor bolt loosening due to vibration or external forces during use. It ensures the safety and reliability of the installation and extends the service life of the longitudinal straight-pull self-expanding joint anchor bolt. The design of the through groove 301 and the clamping portion 302 enables the expansion tube 3 to better adapt to different building top wall materials and structures. Whether it is a top wall made of concrete, masonry or other materials, a good anchoring effect can be achieved. The versatility and applicability of the longitudinal straight-pull self-expanding joint anchor bolt are improved to meet the needs of different projects. The presence of the through slot 301 makes it easier for the expansion tube 3 to deform during installation, facilitating the insertion of the core rod 1 and the application of tension to expand the expansion tube 3. The design of the clamping portion 302 also makes the position of the expansion tube 3 in the top wall more stable, reducing the adjustment and calibration work during installation.

[0033] When temporarily hoisting a small, heavy object, first drill a hole of appropriate size in the building's ceiling. The diameter of this hole should be slightly larger than the outer diameter of the expansion tube 3 to facilitate smooth insertion. Insert the longitudinal straight-pull, self-expanding joint anchor bolt with the expansion tube 3 into the drilled hole. Because the locking portion 302 on the expansion tube 3 is curved and curved away from the clearance groove 303, during insertion, the locking portion 302 is squeezed inward by the hole wall and contracts. Once the expansion tube 3 is fully inserted into the hole, the locking portion 302 springs outward under its own elasticity, locking into the hole wall. At this point, even without further tightening the threaded barrel 5, the longitudinal straight-pull, self-expanding joint anchor bolt remains temporarily secured due to the action of the locking portion 302. Then, select a suitable connector, such as a rope or hook, to connect the small, heavy object to the longitudinal straight-pull, self-expanding joint anchor bolt, completing the temporary hoisting process. At some renovation sites, temporary hoisting of small tools or materials may be necessary. For example, a small lamp can be temporarily suspended from the ceiling for illumination, or some lighter decorative materials can be temporarily hoisted for installation and adjustment. In this case, using this longitudinal straight-pull self-expanding joint anchor with a clip 302 design can quickly achieve temporary fixation, improving work efficiency. This longitudinal straight-pull self-expanding joint anchor can also be used for temporary hoisting of small items during temporary display activities. For example, when hanging display signs or small decorations from the ceiling or wall, the clip 302 design ensures that the longitudinal straight-pull self-expanding joint anchor provides stable support in a short period of time. The clip 302 design eliminates the need for complex installation operations when temporarily hoisting small items; simply insert the clip into the hole to achieve temporary fixation. This significantly saves installation time and improves work efficiency. This quick installation feature is particularly important in emergency situations where a temporary hoisting system needs to be quickly established. Because temporary fixation can be achieved without the use of other components such as the threaded barrel 5, this longitudinal straight-pull self-expanding joint anchor is more flexible in use. Depending on different needs and on-site conditions, you can choose whether to perform further tightening operations to meet various temporary lifting requirements. In some places where space is limited or it is inconvenient to perform complex installation operations, the lifting needs of small weight items can be met by relying solely on the temporary fixing function of the clamping portion 302. For the temporary lifting of small weight items, there is no need to use a full set of longitudinal straight-pull self-expanding joint anchor installation tools and materials, which can save costs. Only a longitudinal straight-pull self-expanding joint anchor with an expansion tube 3 is needed to achieve simple temporary fixation, reducing the waste of materials and tools. At the same time, it also reduces the labor cost and time cost during the installation process, improving economic benefits.

[0034] Furthermore, the expansion tube 3 has a clearance groove 303 , which is located on one side of the clamping portion 302 . The clamping portion 302 is arc-shaped and bends toward a side away from the clearance groove 303 .

[0035] In this embodiment, the expansion tube 3 has a clearance groove 303, which is located on one side of the clamping portion 302. The clamping portion 302 is arc-shaped and bends toward the side away from the clearance groove 303. The clearance groove 303 provides a certain amount of deformation space for the expansion tube 3 during the expansion process. When the core rod 1 is subjected to tension, causing the expansion tube 3 to expand, the material in the clearance groove 303 can flow to both sides, allowing the clamping portion 302 to better bend outward and engage with the external environment. At the same time, the clearance groove 303 can also reduce the resistance encountered by the expansion tube 3 during the expansion process, making the expansion process smoother. The arc-shaped clamping portion 302 can better fit the structure of the building's top wall, increasing the clamping force. When the expansion tube 3 is expanded, the arc-shaped clamping portion 302 can be tightly clamped into the top wall, improving the stability of the anchoring. The design of bending toward the side away from the clearance groove 303 allows the clamping portion 302 to more effectively perform its clamping function during the expansion process, preventing the expansion tube 3 from loosening. The coordination of the clearance groove 303 and the arc-shaped clamping portion 302 enables the expansion tube 3 to be more tightly combined with the top wall of the building after expansion, significantly enhancing the anchoring effect. This ensures that the longitudinal straight-pull self-expanding joint anchor bolt can be firmly fixed on the top wall and withstand greater external forces. For some application scenarios with high anchoring force requirements, such as heavy ceiling installation or the fixation of large suspended equipment, this design can provide more reliable support. The design of the arc-shaped clamping portion 302 can adapt to the top wall surfaces of buildings with different shapes and roughness. Regardless of whether the top wall is flat or has certain bumps and unevenness, the arc-shaped clamping portion 302 can be well clamped to it, improving the adaptability of the longitudinal straight-pull self-expanding joint anchor bolt. The presence of the clearance groove 303 also enables the expansion tube 3 to function better under different installation conditions and adapt to different tensions and expansion degrees. During the installation process, the design of the clearance groove 303 and the arc-shaped clamping portion 302 makes it easier to install the expansion tube 3. The operator can more easily insert the core rod 1 into the expansion tube 3 and apply tension to expand the expansion tube 3 and snap it onto the top wall. If adjustments are required during installation, this design also facilitates fine-tuning the position and expansion level of the expansion tube 3, improving installation accuracy and efficiency.

[0036] Furthermore, the expansion tube 3 has a deformation portion 304 . The deformation portions 304 are arranged in a plurality of circles, and two adjacent deformation portions 304 form a through groove 301 in a straight line.

[0037] In this embodiment, the expansion tube 3 has a deformation portion 304, which is arranged in a circle, and a straight groove 301 is formed between two adjacent deformation portions 304. The design of the deformation portion 304 makes the expansion tube 3 more likely to deform when subjected to the tension of the core rod 1. When the core rod 1 is pulled, the deformation portion 304 will deform first, thereby driving the entire expansion tube 3 to expand outward, increasing the friction with the top wall of the building and improving the anchoring force. The circumferentially arranged deformation portion 304 can make the expansion tube 3 expand evenly in all directions, ensuring a uniform distribution of the anchoring force. The straight groove 301 is formed between two adjacent deformation portions 304. This structure makes the formation of the through groove 301 more natural and stable. The through groove 301 plays a role in guiding the expansion direction and providing deformation space during the expansion process, and the combination of the deformation portion 304 and the through groove 301 makes the expansion of the expansion tube 3 more controllable and effective. The design of the deformation portion 304 and the through groove 301 works together to enhance the expansion effect of the expansion tube 3, thereby improving the anchoring stability of the longitudinal straight-pull self-expanding joint anchor bolt. In various complex usage environments, the longitudinal straight-pull self-expanding joint anchor bolt can better withstand external forces and reduce the risk of loosening and displacement. This design to improve anchoring stability is particularly important for the installation of suspended ceilings or suspended parts that require long-term fixation. During the installation process, the presence of the deformation portion 304 makes it easier to insert the expansion tube 3 into the hole in the top wall of the building. When the core rod 1 is pulled, the deformation of the deformation portion 304 can enable the expansion tube 3 to gradually adapt to the shape and size of the hole, thereby improving the accuracy and efficiency of the installation.

[0038] Furthermore, the locking portion 302 is located in the middle of the deformation portion 304 .

[0039] In this embodiment, the clamping portion 302 is located in the middle of the deformation portion 304. When the expansion tube 3 is subjected to the pulling force of the core rod 1, the deformation portion 304 will deform, thereby driving the expansion tube 3 to expand. Placing the clamping portion 302 in the middle of the deformation portion 304 allows the clamping portion 302 to better cooperate with the deformation portion 304 during the expansion process. The deformation of the deformation portion 304 causes the clamping portion 302 to more closely contact and clamp with the top wall of the building, thereby improving the stability of the anchoring. Under the push of the deformation portion 304, the clamping portion 302 can more effectively exert its clamping function, preventing the expansion tube 3 from loosening or slipping when subjected to force. The clamping portion 302 is located in the middle of the deformation portion 304, so that the anchoring force on the expansion tube 3 is more evenly distributed. The stress generated by the deformation portion 304 during the expansion process can be transmitted to different positions on the top wall of the building through the clamping portion 302, thereby increasing the friction and anchoring force between the longitudinal straight-pull self-expandable joint anchor bolt and the top wall. This uniform distribution of anchoring force can improve the overall bearing capacity of the longitudinal straight-pull self-expanding joint anchor, enabling it to withstand greater tension and shear forces.

[0040] The optimized coordination between the clamping portion 302 and the deformable portion 304 ensures the reliability of the longitudinal straight-pull self-expandable joint anchor during installation. When the expansion tube 3 is inserted and tension is applied, the clamping portion 302 quickly engages the top wall, while the expansion of the deformable portion 304 provides stable support, reducing uncertainty during installation.

[0041] The material and structure of a building's ceiling may vary depending on the environment. The design of the clamping portion 302 located in the middle of the deformable portion 304 allows the longitudinal straight-pull self-expanding joint anchor to better adapt to various working conditions. Whether on concrete, masonry, or other ceiling materials, this design ensures the expansion and clamping effect of the expansion tube 3, enhancing the versatility of the longitudinal straight-pull self-expanding joint anchor.

[0042] Example 2

[0043] Reference Figures 3 to 5 , which is the second embodiment of the present utility model, is different from the first embodiment in that:

[0044] Compared with Example 1, further, the clamping portion 302 is located between the deformation portion 304 and the end of the expansion tube 3 .

[0045] In this embodiment, when the expansion tube 3 expands under the action of the core rod 1, the deformable portion 304 deforms first. The clamping portion 302 is located between the deformable portion 304 and the end of the expansion tube 3, allowing the clamping portion 302 to more closely contact and clamp onto the building's roof during expansion. This positional relationship increases the friction and clamping force between the expansion tube 3 and the roof, thereby improving the anchoring stability of the longitudinal straight-pull self-expandable joint anchor, ensuring that it will not easily loosen or fall off when subjected to external forces. The deformation of the deformable portion 304 exerts a certain thrust on the clamping portion 302, allowing it to better embed into the roof. At the same time, the clamping portion 302 also acts to limit the expansion of the deformable portion 304, preventing damage to the expansion tube 3 due to excessive expansion. This interaction optimizes the expansion effect of the expansion tube 3, ensuring that it can achieve good anchoring under different roof conditions. The appropriate positioning of the clamping portion 302 ensures that the longitudinal straight-pull self-expandable joint anchor functions correctly during installation, improving installation quality. Reduce the risk of anchor instability or failure due to improper installation and ensure the safety of buildings or equipment.

[0046] Furthermore, the clamping portion 302 is an elastic clamping portion.

[0047] In this embodiment, the clamping portion 302 is an elastic clamping portion. The elastic clamping portion can adapt to installation holes of different diameters to a certain extent. When inserting the expansion tube 3, the elastic clamping portion can facilitate the operator to push it into the hole.

[0048] Furthermore, the end of the deformation portion 304 has an arc-shaped inner concave portion 305 .

[0049] In this embodiment, the end of the deformation portion 304 has an arc-shaped inner recess 305. When the expansion tube 3 is subjected to the tension of the core rod 1, the deformation portion 304 begins to deform. The design of the arc-shaped inner recess 305 makes the deformation portion 304 easier to bend and expand during the expansion process. This arc-shaped structure can guide the direction of deformation, making the expansion more uniform and controllable, and improving the expansion effect of the expansion tube 3. After expansion, the arc-shaped inner recess 305 can better fit the top wall of the building. The contact area between the expansion tube 3 and the top wall is increased, thereby improving the friction and anchoring force. This close contact can effectively prevent the expansion tube 3 from loosening or shifting during use, thereby enhancing the stability of the longitudinal straight-pull self-expanding joint anchor. The arc-shaped shape can disperse stress and avoid stress concentration at the end of the deformation portion 304. This helps to improve the strength and durability of the expansion tube 3 and extend the service life of the longitudinal straight-pull self-expanding joint anchor. When subjected to significant external forces, the curved inner recess 305 can better withstand the pressure, reducing the risk of damage to the expansion tube 3. The design of the curved inner recess 305 enables the longitudinal straight-pull self-expanding joint anchor to provide a stronger anchoring force after installation. Whether installing in a suspended ceiling or other suspended parts, this ensures a secure and safe connection. This enhanced anchoring effect is particularly important in applications that require support of significant weight or external forces.

[0050] Furthermore, the cross-sectional area of ​​the clamping portion 302 gradually decreases from the expansion tube 3 to the end portion of the clamping portion 302 .

[0051] In this embodiment, the cross-sectional area of ​​the clamping portion 302 of this longitudinal straight-pull self-expanding joint anchor gradually decreases from the expansion tube 3 toward the end of the clamping portion 302. This gradually decreasing cross-sectional area design makes it easier for the clamping portion 302 to be inserted into the mounting hole in the building's ceiling. The smaller cross-sectional area at the front end of the clamping portion 302 reduces insertion resistance, allowing the expansion tube 3 to be smoothly inserted into the hole. This helps improve installation efficiency and reduces installation difficulties and time. When the expansion tube 3 is inserted into the hole and expands, the clamping portion 302 contacts the hole wall and generates a locking force. As the cross-sectional area of ​​the clamping portion 302 gradually decreases, its contact area with the hole wall gradually increases, thereby enhancing the locking effect. This gradually increasing locking force ensures that the longitudinal straight-pull self-expanding joint anchor will not easily loosen or fall off during use, improving the stability and reliability of the anchoring. The gradually decreasing cross-sectional area of ​​the clamping portion 302 allows the longitudinal straight-pull self-expanding joint anchor to adapt to mounting holes of varying diameters to a certain extent. For slightly larger or smaller holes, the clamping portion 302 can deform to adjust its contact with the hole wall, enhancing the versatility of the longitudinal straight-pull self-expanding joint anchor. This is extremely useful in actual construction, reducing installation issues caused by hole diameter deviation. Smooth insertion and a strong clamping effect ensure the installation quality of the longitudinal straight-pull self-expanding joint anchor. This reduces uncertainty and error during installation, allowing the longitudinal straight-pull self-expanding joint anchor to better perform its anchoring function.

[0052] Furthermore, both ends of the cross section of the clamping portion 302 parallel to the axial direction of the expansion tube 3 are acute-angled.

[0053] In this embodiment, the two ends of the clamping portion 302, parallel to the axial direction of the expansion tube 3, are acutely angled. These acutely angled ends allow the expansion tube 3 to better embed into the hole wall when it is inserted into the mounting hole and expanded. This sharp shape increases the friction and engagement between the clamping portion 302 and the hole wall, thereby improving the stability of the clamping connection. Even when subjected to external forces, the acutely angled clamping portion 302 is less likely to slip from the hole wall, ensuring that the longitudinal straight-pull self-expanding joint anchor bolt is securely fixed to the building ceiling. Different building ceiling materials and hole diameters may affect the clamping effect of the longitudinal straight-pull self-expanding joint anchor bolt. The acutely angled clamping portion 302 can accommodate a range of hole diameter variations and hole wall materials, enhancing the versatility of the longitudinal straight-pull self-expanding joint anchor bolt. For rough or uneven hole walls, the acutely angled clamping portion 302 can better conform to the surface shape, increasing the clamping force. During installation, the acutely angled clamping portion 302 makes it easier to insert into the mounting hole. Its sharp end can reduce the resistance when inserting into the wall of the installation hole after it is in place, so that the expansion tube 3 can be fixed smoothly. When the expansion tube 3 is hoisted after the expansion is completed, the sharp-angled clamping portion 302 will quickly clamp with the hole wall, improving the efficiency and accuracy of the installation. The stable clamping effect can ensure the installation quality of the longitudinal straight-pull self-expanding joint anchor bolt. It reduces the safety hazards caused by loose clamping and improves the stability and reliability of the building or equipment. Reliable clamping stability reduces the risk of loosening and falling off of the longitudinal straight-pull self-expanding joint anchor bolt during use. This means that the frequency of maintenance and replacement is reduced, and maintenance costs are reduced.

[0054] Furthermore, the included angle between the bottom surface of the end of the clamping portion 302 and the radial direction of the expansion tube 3 is less than or equal to 90 degrees, and both ends of the expansion tube 3 have a deformation portion 304 .

[0055] In this embodiment, the radial angle between the bottom surface of the end of the clamping portion 302 and the expansion tube 3 is less than or equal to 90 degrees, and the radial angle between the end of the clamping portion 302 and the axis of the expansion tube 3 is less than or equal to 45 degrees. The radial angle between the bottom surface of the end of the clamping portion 302 and the expansion tube 3 is less than or equal to 90 degrees, so that the clamping portion 302 can better contact the hole wall after being inserted into the installation hole. The smaller angle increases the fit between the clamping portion 302 and the hole wall, improving the clamping force. The angle between the end of the clamping portion 302 and the axis of the expansion tube 3 is less than or equal to 45 degrees, so that the clamping portion 302 can interact with the hole wall at a more appropriate angle when the expansion tube 3 expands. This angle design helps to enhance the stability of the clamping portion 302 and prevent it from loosening or slipping when subjected to force. The optimized clamping angle enables the longitudinal straight-pull self-expanding joint anchor bolt to generate greater anchoring force on the top wall of the building. The tight fit and stable connection between the clamping portion 302 and the hole wall ensures that the longitudinal straight-pull self-expanding joint anchor can withstand greater tensile and shear forces, improving the reliability of the connection. The design of the double deformation portion 304 enhances the anchoring force of the expansion tube 3, making it more suitable for applications requiring heavy loads, such as suspending large equipment or connecting important structures. This enhanced anchoring force is particularly important.

[0056] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. Longitudinal straight pull self-expanding joint anchor bolt, characterized by: include One end of the expansion tube (3) has a through groove (301), and the through grooves (301) are arranged in a plurality of circles. The expansion tube (3) has a clamping portion (302), and the clamping portion (302) is arranged in a plurality of circles for clamping with the external environment.

2. The longitudinal straight pull self-expandable joint anchor according to claim 1, characterized in that: The expansion tube (3) has a clearance groove (303), and the clearance groove (303) is located on one side of the clamping portion (302). The clamping portion (302) is arc-shaped and bends toward a side away from the clearance groove (303).

3. The longitudinal straight pull self-expandable joint anchor according to claim 1, characterized in that: The expansion tube (3) has a deformation portion (304), and the deformation portions (304) are arranged in a plurality of circles, and two adjacent deformation portions (304) form the through groove (301) in a straight line.

4. The longitudinal straight pull self-expandable joint anchor according to claim 3, characterized in that: The clamping portion (302) is located in the middle of the deformation portion (304).

5. The longitudinal straight pull self-expandable joint anchor according to claim 3, characterized in that: The clamping portion (302) is located between the deformation portion (304) and the end of the expansion tube (3).

6. The longitudinal straight pull self-expandable joint anchor according to claim 1, characterized in that: The clamping portion (302) is an elastic clamping portion.

7. The longitudinal straight-pull self-expandable joint anchor according to claim 3, characterized in that: The end of the deformation portion (304) has an arc-shaped inner concave portion (305).

8. The longitudinal straight pull self-expandable joint anchor according to claim 1, characterized in that: The cross-sectional area of ​​the clamping portion (302) gradually decreases from the expansion tube (3) toward the end of the clamping portion (302).

9. The longitudinal straight pull self-expandable joint anchor according to claim 1, characterized in that: The two end portions of the cross section of the clamping portion (302) parallel to the axial direction of the expansion tube (3) are acute-angled.

10. The longitudinal straight pull self-expandable joint anchor according to claim 3, characterized in that: The radial angle between the bottom surface of the end of the clamping portion (302) and the expansion tube (3) is less than or equal to 90 degrees, and both ends of the expansion tube (3) have the deformation portion (304).

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