Longitudinal self-expansion type connector anchor bolt capable of being fastened

Abstract

The invention relates to the technical field of fasteners, and provides a longitudinal self-expanding fastenable joint anchor bolt which comprises a core rod, the core rod is provided with an external thread part, an expansion pipe is arranged on the core rod in a sleeving mode, a threaded cylinder is provided with an abutting part, the abutting part abuts against one end of the expansion pipe, the threaded cylinder is provided with an internal thread through hole, and the internal thread through hole is provided with a first thread part and a second thread part. The external thread part is in threaded connection with the first thread part, the second thread part is in threaded connection with the connecting piece, and the thread barrel is provided with a top groove located in the end of the second thread part. By means of the technical scheme, the problems that in the prior art, due to the fact that the production process is complex, the rejection rate is high, the installation process is tedious, much time and labor cost are consumed, the labor intensity of constructors is increased, and the working efficiency is reduced are solved.

Description

Technical Field

[0001] The invention relates to the technical field of fasteners, and in particular to a longitudinal self-expanding fastenable joint anchor bolt. Background Art

[0002] In the field of construction, the connection between the top wall of the building and the connecting parts is crucial. Traditional connection methods may have problems such as high scrap rate, inconvenient installation, time-consuming and labor-intensive. With the continuous development of the construction industry, higher requirements are placed on the quality and installation efficiency of connecting components. How to reduce the scrap rate in the production process, improve product quality, and make installation more convenient and quick has become a technical problem that needs to be solved urgently. The complex production process leads to a high scrap rate, and the installation process is cumbersome, which consumes more time and manpower costs, increases the labor intensity of construction workers, and reduces work efficiency. Therefore, a new type of longitudinal self-expanding and tightenable joint anchor bolt is needed to solve these problems. Summary of the invention

[0003] The present invention proposes a longitudinal self-expanding and fastenable joint anchor bolt, which solves the problems in the related art of complex production process leading to high scrap rate, cumbersome installation process, high time and labor cost, increased labor intensity of construction personnel, and reduced work efficiency.

[0004] The technical solution of the present invention is as follows: A longitudinal self-expanding fastenable joint anchor bolt, which is used for connecting a building top wall with a connecting piece, comprising a core rod having an external threaded portion, an expansion tube, wherein the expansion tube is sleeved on the core rod, A threaded barrel, wherein the threaded barrel has an abutment portion, the abutment portion abuts against one end of the expansion tube, the threaded barrel has an internal threaded through hole, the internal threaded through hole has a first threaded portion and a second threaded portion, the external threaded portion is threadedly connected to the first threaded portion, the second threaded portion is threadedly connected to the connecting piece, and the threaded barrel has a top groove, and the top groove is located at the end of the second threaded portion.

[0005] As a further technical solution, the end of the core rod has an arc-shaped expansion portion, and the radial cross-sectional area of ​​the arc-shaped expansion portion gradually expands from the middle of the core rod to one side of the end portion. The arc-shaped expansion portion and the external threaded portion are respectively located at both ends of the core rod, and one end of the expansion tube abuts against the small end of the arc-shaped expansion portion, and the diameter of the large end of the arc-shaped expansion portion is greater than the outer diameter of the threaded tube.

[0006] As a further technical solution, the top groove is a straight or cross-shaped top groove.

[0007] As a further technical solution, the core rod has a boss portion, and the boss portion is located on a side of the external thread portion close to the arc-shaped expansion portion.

[0008] As a further technical solution, the threaded barrel has a limiting protrusion, the limiting protrusion is located between the first threaded portion and the second threaded portion, and the limiting protrusion is used to abut against the end of the connecting piece.

[0009] As a further technical solution, the end of the arc-shaped enlarged portion has an anti-rotation protrusion, and the anti-rotation protrusions are arranged in a plurality.

[0010] As a further technical solution, one end of the expansion tube has a through groove, and the through grooves are arranged in a plurality of circles. The expansion tube has a clamping portion, and the clamping portion is arranged in a plurality of circles for clamping with the external environment. The expansion tube has a give-way groove, and the give-way groove is located on one side of the clamping portion. The clamping portion is arc-shaped and bends toward a side away from the give-way groove. The expansion tube has a deformation portion, and the deformation portion is arranged in a plurality of circles. Two adjacent deformation portions straightly form the through groove.

[0011] As a further technical solution, the clamping portion is located in the middle of the deformation portion.

[0012] As a further technical solution, the clamping portion is located between the deformation portion and the end of the expansion tube.

[0013] As a further technical solution, the clamping portion is an elastic clamping portion, the end of the deformation portion has an arc-shaped inner recessed portion, the cross-sectional area of ​​the clamping portion gradually decreases from the expansion tube to the end of the clamping portion, the two ends of the cross section of the clamping portion parallel to the axial direction of the expansion tube are acute-angled, the bottom surface of the end of the clamping portion and the radial angle of the expansion tube are less than or equal to 90 degrees, one end of the threaded barrel has a tapered surface, both ends of the expansion tube have the deformation portion, and the tapered surface abuts against the deformation portion.

[0014] The working principle and beneficial effects of the present invention are: In the present invention, the scrap rate in the production process is reduced through the split design, and the product quality is improved. The design of the through-hole threaded hole makes the installation of the longitudinal self-expanding fastening type joint anchor bolt more convenient and quick. During the installation process, the quality of the threaded connection can be better guaranteed, and the installation time and labor cost can be reduced. For the construction personnel, the work efficiency is improved and the labor intensity is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The preferred implementation modes 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.

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a partial structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 4 It is a structural schematic diagram of another form of the expansion tube in the present invention; Figure 5 It is a structural schematic diagram of another form of the threaded barrel in the present invention; Figure 6 It is a structural schematic diagram of another form of the core rod of the present invention; Figure 7 for Figure 5 A schematic cross-sectional structure diagram of ; Figure 8 for Figure 7 A is a schematic diagram of the enlarged structure of the middle part; Fig. 9 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Fig.10 This is a structural diagram of another form of embodiment 2 of the present invention; Fig.11 This is a schematic structural diagram of another form of the expansion tube in Example 2 of the present invention; In the figure: core rod 1, arc-shaped enlarged portion 101, boss portion 102, anti-rotation protrusion 103, external threaded portion 2, expansion tube 3, through groove 301, clamping portion 302, yielding groove 303, deformation portion 304, arc-shaped inner recessed portion 305, threaded barrel 5, internal threaded through hole 501, first threaded portion 502, second threaded portion 503, top groove 504, limiting protrusion 505, tapered surface 506. DETAILED DESCRIPTION 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 accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0017] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0018] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] 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.

[0020] Example 1 Reference Figure 1 to Figure 8 , which is the first embodiment of the present invention, proposes a longitudinal self-expanding and fastening joint anchor bolt, which is used for connecting the top wall of a building with a connecting piece, and includes a core rod 1, the core rod 1 has an external threaded portion 2, an expansion tube 3 is sleeved on the core rod 1, a threaded barrel 5 has an abutment portion, the abutment portion abuts against one end of the expansion tube 3, the threaded barrel 5 has an internal threaded through hole 501, the internal threaded through hole 501 has a first threaded portion 502 and a second threaded portion 503, the external threaded portion 2 is threadedly connected to the first threaded portion 502, the second threaded portion 503 is threadedly connected to the connecting piece, and the threaded barrel 5 has a top groove 504, and the top groove 504 is located at the end of the second threaded portion 503.

[0021] In this embodiment, when using the longitudinal self-expanding fastening type joint anchor bolt, a hole of suitable diameter and depth is drilled on the top wall of the building, the expansion tube 3 is sleeved on the core rod 1, and then the core rod 1 is inserted into the drilled hole, the first threaded portion 502 of the threaded barrel 5 is aligned with the external threaded portion 2 of the core rod 1, and then the threaded barrel 5 is rotated to be threadedly connected with the core rod 1. During the rotation process, the abutment portion of the threaded barrel 5 abuts against one end of the expansion tube 3, and after abutment, it continues to be tightened, and the expansion tube expands to achieve fixation. The threaded portion of the connector is aligned with the second threaded portion 503 of the threaded barrel 5, and the connector is rotated to be threadedly connected with the threaded barrel 5. After completing the connection between the connector and the threaded barrel 5, the connector can be used to suspend or hoist items. The combination of the core rod 1 and the expansion tube 3 provides a strong anchoring force. The expansion tube 3 expands during the installation process and is tightly combined with the top wall of the building, increasing the friction and anchoring force. This anchoring force can ensure that the connector is firmly fixed on the top wall of the building and withstands various external forces, such as wind force, vibration, etc. The internal threaded through hole 501 of the threaded barrel 5 is divided into a first threaded portion 502 and a second threaded portion 503, which are respectively threadedly connected to the core rod 1 and the connector. This threaded connection method has the advantages of reliable connection and not easy to loosen. Even during long-term use, a stable connection can be maintained to ensure the safety of the building. The installation process of the longitudinal self-expanding and fastening type joint anchor bolt is relatively simple and does not require complex tools and equipment. It only needs to drill a hole, insert the core rod 1, put on the expansion tube 3 and the threaded barrel 5, and then rotate the threaded barrel 5 and the connector to complete the installation. This installation method saves construction time and labor costs and improves construction efficiency. The longitudinal self-expanding and fastening type joint anchor bolt can be applied to different types of building top wall materials, such as concrete, masonry, etc. At the same time, it can also be adjusted and selected according to different connector requirements, and has strong adaptability.

[0022] If this solution is used for a suspended ceiling, when installing the suspended ceiling, first determine the installation position of the longitudinal self-expanding and fastening type joint anchor bolt on the top wall of the building according to the design requirements and load-bearing requirements of the suspended ceiling. Use professional drilling equipment to drill a hole of suitable diameter and depth on the top wall. Put the expansion tube 3 on the core rod 1, and then insert the core rod 1 into the drilled hole. Align the first threaded portion 502 of the threaded barrel 5 with the external threaded portion 2 of the core rod 1, and rotate the threaded barrel 5 to make it firmly connected with the core rod 1. At this time, the abutment portion of the threaded barrel 5 is tightly abutted with one end of the expansion tube 3. According to the installation method of the suspended ceiling, select a suitable connector, such as a hanger, a hanging part, etc. Align the threaded portion of the connector with the second threaded portion 503 of the threaded barrel 5, and rotate the connector to make it threadedly connected with the threaded barrel 5. After the connection is completed, the horizontality and height of the suspended ceiling can be adjusted by adjusting the length or angle of the connector. Finally, install the ceiling material on the connector to complete the installation of the suspended ceiling.

[0023] The second threaded portion 503 of the threaded barrel 5 can be threadedly connected with different types of connectors, which makes the installation process more flexible. Suitable connectors can be selected according to different installation requirements, such as the length and angle of the suspension rod can be adjusted to meet different installation requirements. This flexibility enables the longitudinal self-expanding fastening type joint anchor to play a good role in various complex installation scenarios. The installation process of the longitudinal self-expanding fastening type joint anchor is relatively simple and fast, and does not require complex processes and a large amount of manpower. In the installation of the ceiling and the installation of the suspension part, the construction time can be greatly shortened and the construction efficiency can be improved. At the same time, due to the simple installation process, the possibility of errors and rework during the construction process is also reduced. Using the longitudinal self-expanding fastening type joint anchor for installation can make the installation of the ceiling and suspended objects more neat and beautiful. The longitudinal self-expanding fastening type joint anchor can be hidden in the interior of the ceiling material or the suspended object, and will not affect the overall decorative effect. At the same time, due to the firm installation, there will be no problems such as shaking or skewing caused by the loose installation, and the beauty and neatness of the installation are maintained. Each component of the longitudinal self-expanding fastening joint anchor bolt is made of high-quality materials with good corrosion resistance and durability. In the long-term use process, it can maintain stable performance and will not become loose or corroded due to the passage of time. This provides a reliable guarantee for the long-term use of suspended ceilings and suspension parts.

[0024] When the connector needs to be removed, it is only necessary to unscrew the connector from the second threaded portion 503 of the threaded barrel 5. Since the threaded barrel 5 is located in the hole, the removal process is relatively simple and will not cause significant damage to the top wall of the building. After removing the connector, the appearance of the wall is repaired. Compared with the expansion bolts of the prior art, there is no need to perform the core rod 1 removal operation. The hole can be directly filled with a suitable filler. Since the threaded barrel 5 is located in the hole, the filling amount is reduced, which reduces the repair cost. During the filling process, a filler that is compatible with the material of the top wall of the building is selected to ensure that the appearance after filling is consistent with the surrounding wall surface. After the filling is completed, the filled part can be flattened with a tool to make it more integrated with the surrounding wall surface. The design of this longitudinal self-expanding and fastening type joint anchor bolt is suitable for the installation of ceilings and suspension parts of various buildings, and can play a good role in both new buildings and the renovation of old buildings. Its easy repair feature also makes it more convenient when the connector needs to be replaced or repaired, enhancing its applicability and practicality.

[0025] When installing the longitudinal self-expanding fastening type joint anchor bolt, when the threaded barrel 5 is threadedly connected with the core rod 1 and the connector, a screwdriver or other items matching the top groove 504 structure can be inserted into the top groove 504. By rotating the screwdriver or other tools, the threaded barrel 5 is driven to rotate to achieve the tightening operation. In some installation scenarios where the space is narrow or it is difficult to use special tools, the top groove 504 structure at the bottom of the threaded barrel 5 is particularly practical. For example, in the installation of the ceiling, the use of traditional nuts and special tools may be restricted due to limited space. The top groove 504 structure allows operators to use common screwdrivers for tightening, which is more convenient and quick. For some temporary installations or situations where frequent disassembly is required, the top groove 504 structure also provides greater flexibility. Installation and disassembly operations can be performed quickly to improve work efficiency. Since common tools such as screwdrivers can be used for tightening, the dependence on special tools is reduced. In actual construction, operators can find suitable tools more easily, which improves the convenience of work.

[0026] The absence of protruding nut parts reduces the risk of people being scratched during activities. Especially in some crowded places, such as shopping malls, schools, hospitals, etc., this hidden design can improve safety and reduce the occurrence of accidents. In some places with limited space, the hidden longitudinal self-expanding fastening type joint anchor bolt will not take up extra space, making the space more tidy and open. For example, in a small office or residence, this design can avoid affecting the placement of furniture or the activity space of people due to the protruding nut.

[0027] When manufacturing the threaded barrel 5, compared with the integrated design, the threaded hole designed with a through hole has a simpler processing technology than the blind hole. For example, during the drilling process, the through hole can complete the drilling operation at one time, while the blind hole needs to be drilled multiple times or a special processing technology is used, which increases the processing time and cost. In terms of material cost, the through hole design can reduce the amount of material used. Since there is no need to process the bottom part of the blind hole, the waste of materials is reduced, which reduces the production cost. When installing the longitudinal self-expanding and tightenable joint anchor bolt, the threaded connection is smoother through the design of the threaded hole. When tightening the threaded barrel 5, air and impurities can be discharged from the through hole, avoiding the difficulty of threaded connection caused by air compression or impurity blockage. For some installation scenarios that need to be adjusted or disassembled, the through hole threaded hole is more convenient to operate. Tools such as screwdrivers, wrenches, etc. can be inserted through the through hole to disassemble and adjust the threaded barrel 5, while blind holes may require more complex tools and operating methods.

[0028] The processing technology of through-hole threaded holes is simplified, the processing time is short, and the material usage is small. These factors work together to greatly reduce the production cost. For production companies, it can improve the competitiveness of products and increase market share. Simple processing technology and efficient processing equipment make the production efficiency of through-hole threaded holes higher. A large number of threaded barrels 5 can be produced in a short time to meet market demand. At the same time, it also reduces the scrap rate in the production process and improves product quality. The design of the through-hole threaded hole makes the installation of the longitudinal self-expanding and tightenable joint anchor bolt more convenient and quick. During the installation process, the quality of the threaded connection can be better guaranteed, reducing installation time and labor costs. For construction personnel, work efficiency is improved and labor intensity is reduced.

[0029] The processing of the limiting protrusion 505 can be a welding point or a blind hole. In order to ensure the reduction of the overall processing cost, the optimal solution for the processing of the limiting boss 505 is to use a dotting tool to dot the outer wall of the threaded barrel 5 after the threaded through hole processing is completed, and to punch through the outer wall so that a boss is formed when the material is deformed. At the same time, the hole punched by the dotting tool also facilitates the observation of the installation status inside the internal threaded through hole 501.

[0030] Furthermore, the end of the core rod 1 has an arc-shaped expansion portion 101, and the radial cross-sectional area of ​​the arc-shaped expansion portion 101 gradually expands from the middle of the core rod 1 to one end side. The arc-shaped expansion portion 101 and the external threaded portion 2 are respectively located at both ends of the core rod 1, and one end of the expansion tube 3 abuts against the small end of the arc-shaped expansion portion 101.

[0031] In this embodiment, in the longitudinal self-expanding fastening type joint anchor bolt, the end of the core rod 1 has an arc-shaped expansion portion 101. The radial cross-sectional area of ​​the arc-shaped expansion portion 101 gradually expands from the middle of the core rod 1 to one side of the end, and the arc-shaped expansion portion 101 and the external threaded portion 2 are respectively located at both ends of the core rod 1. One end of the expansion tube 3 abuts against the small end of the arc-shaped expansion portion 101. The design of the arc-shaped expansion portion 101 makes it easier to install the expansion tube 3. As its radial cross-sectional area gradually expands, the expansion tube 3 can be easily sleeved on the core rod 1 and abut against the small end of the arc-shaped expansion portion 101 to ensure the accurate installation position. This structure reduces the difficulty and error in the installation process and improves the installation efficiency. When a tensile force is applied to the core rod 1, the arc-shaped expansion portion 101 will generate an outward extrusion force on the expansion tube 3. As the cross-sectional area of ​​the arc-shaped expansion portion 101 gradually expands, this extrusion force will gradually increase, so that the expansion tube 3 fits more closely in the hole of the top wall of the building, thereby enhancing the anchoring effect. This enhanced anchoring force can ensure that the longitudinal self-expanding and fastening type joint anchor bolt can withstand greater tension and shear force, and improve the stability and safety of the connection. The design of the arc-shaped expansion portion 101 makes the installation of the longitudinal self-expanding and fastening type joint anchor bolt more accurate and stable, reducing the uncertainty in the installation process. This helps to improve the installation quality and ensure that the connection between the connector and the top wall of the building is firm and reliable. As the cross-sectional area of ​​the arc-shaped expansion portion 101 gradually expands, it can adapt to the top wall holes of the building with different apertures within a certain range. This increases the versatility of the longitudinal self-expanding and fastening type joint anchor bolt, allowing it to be used under different construction conditions. It reduces the need to replace the longitudinal self-expanding and fastening type joint anchor bolt due to aperture mismatch, thereby improving construction efficiency.

[0032] Furthermore, the diameter of the larger end of the arc-shaped enlarged portion 101 is larger than the outer diameter of the threaded barrel 5 .

[0033] In this embodiment, after the longitudinal self-expanding fastening type joint anchor bolt is installed, the large end of the arc-shaped expansion portion 101 can play a role in limiting the position of the threaded barrel 5. Since its diameter is larger than the outer diameter of the threaded barrel 5, the threaded barrel 5 will not move excessively to the end of the core rod 1 during the installation process, ensuring that the relative position of the threaded barrel 5 and the expansion tube 3 and other components is stable. The large end diameter of the arc-shaped expansion portion 101 is larger, which can better transfer the tension to the expansion tube 3 and the top wall of the building. When subjected to external force, the arc-shaped expansion portion 101 can more evenly disperse the force to the surrounding structure, reduce local stress concentration, and thus enhance the transmission effect of the anchoring force. This helps to improve the bearing capacity of the longitudinal self-expanding fastening type joint anchor bolt, ensuring that there will be no loosening or failure when connecting heavy objects or bearing large external forces. Clear size restrictions make the installation process more precise. The operator can more easily control the position of the threaded barrel 5 to ensure that it is accurately matched with other components. This helps to improve installation accuracy, reduce installation errors, and improve the quality of the connection. This feature is particularly important for some application scenarios that require high installation accuracy, such as the installation of precision equipment or the connection of important structures. Since the diameter of the large end of the arc-shaped expansion portion 101 is larger than the outer diameter of the threaded barrel 5, after the installation is completed, the relative position of the threaded barrel 5 and the arc-shaped expansion portion 101 can be observed to determine whether the longitudinal self-expanding and fastening type joint anchor is installed correctly. This facilitates post-installation inspections and timely detection and resolution of potential problems. At the same time, when maintenance or replacement is required, the longitudinal self-expanding and fastening type joint anchor can also be more easily identified and disassembled, thereby improving maintenance efficiency.

[0034] Furthermore, the top groove 504 is a straight-shaped or cross-shaped top groove.

[0035] In this embodiment, the design of the straight or cross-shaped top groove allows common straight screwdrivers or cross screwdrivers to be used for operation when tightening the threaded barrel 5. This design increases the versatility of the tool and facilitates operators to find suitable tools for installation in different construction environments. Compared with the top groove 504 of special shape, the straight and cross-shaped top grooves 504 are easier to cooperate with common tools, which improves the efficiency of installation. The straight or cross-shaped top groove 504 can provide a better focus point, so that the operator can apply greater force when tightening with tools such as screwdrivers. This helps to ensure that the connection between the threaded barrel 5 and the core rod 1 and the connecting piece is more firm and reliable, and improves the overall stability of the longitudinal self-expanding fastening type joint anchor bolt. In application scenarios that need to withstand large tension or shear force, this design of increasing the tightening force is particularly important. Common tools can be used for operation, without the need for special special tools, which reduces the requirements for tools and improves the convenience of installation. Whether at the construction site or in daily maintenance, the longitudinal self-expanding fastening type joint anchor bolt can be installed and removed more conveniently. Convenient tool operation and increased tightening strength can ensure the installation quality of longitudinal self-expanding fastening joint anchor bolts. The firm connection can reduce the risk of loosening and falling off during use, and improve the reliability and safety of the connection.

[0036] Furthermore, the core rod 1 has a boss portion 102 , and the boss portion 102 is located on a side of the external thread portion 2 close to the arc-shaped enlarged portion 101 .

[0037] In this embodiment, the boss portion 102 can play a role in positioning and limiting during the installation process. When the core rod 1 is inserted into the expansion tube 3, the boss portion 102 can contact the end of the expansion tube 3 to ensure that the core rod 1 is inserted to an accurate depth and prevent the core rod 1 from being over-inserted or not inserted in place. This positioning and limiting function helps to improve the accuracy and consistency of the installation and ensure that the various components of the longitudinal self-expanding fastening type joint anchor can be assembled correctly. The presence of the boss portion 102 can increase the structural strength and stability of the core rod 1. When subjected to external force, the boss portion 102 can share part of the stress, reduce the force on the external threaded portion 2 and the arc-shaped expansion portion 101, and thus reduce the risk of deformation or damage to the core rod 1. This helps to improve the overall bearing capacity and reliability of the longitudinal self-expanding fastening type joint anchor, and ensure that stable connection performance can be maintained during long-term use. Accurate positioning and limiting functions can reduce the adjustment and trial and error time during the installation process and improve installation efficiency. Operators can complete the assembly of the longitudinal self-expanding fastening type joint anchor more quickly, reducing construction time and labor costs. For large-scale installation projects, this efficiency improvement is particularly obvious, which can speed up the project progress and improve production efficiency. The stable structure and enhanced bearing capacity can improve the reliability of the longitudinal self-expanding fastening type joint anchor bolt. In various complex use environments, the longitudinal self-expanding fastening type joint anchor bolt can better withstand external forces and reduce the problem of connection failure caused by structural instability.

[0038] Furthermore, the threaded barrel 5 has a limiting protrusion 505 , and the limiting protrusion 505 is located between the first threaded portion 502 and the second threaded portion 503 . The limiting protrusion 505 is used to abut against the end of the connecting piece.

[0039] In this embodiment, the main function of the limiting protrusion 505 is to limit the position of the connecting member when installing the connecting member. When the connecting member is threadedly connected to the second threaded portion 503 of the threaded barrel 5, the end of the connecting member will abut against the limiting protrusion 505, thereby preventing the connecting member from being over-screwed into the threaded barrel 5. This limiting effect can ensure that the connection between the connecting member and the threaded barrel 5 is in the correct position, ensuring the stability and reliability of the connection. Through the limiting protrusion 505, the installation depth of the connecting member can be accurately controlled to improve the installation accuracy. Avoid affecting the overall performance of the longitudinal self-expanding fastening type joint anchor bolt due to the connecting member being screwed in too deep or too shallow. Accurate position limitation can make the connection between the connecting member and the threaded barrel 5 tighter and more stable. Reduce the risk of loosening or falling off caused by improper position of the connecting member during use, and improve the connection reliability of the longitudinal self-expanding fastening type joint anchor bolt. This helps to ensure the safety and stability of buildings or equipment and reduce safety accidents caused by connection problems. The limiting protrusion 505 provides a clear reference point for installing the connecting member, making the installation process simpler and more intuitive. The operator can more easily judge whether the installation position of the connector is correct, thereby improving the installation efficiency. The design of the limiting protrusion 505 can make the longitudinal self-expanding fastening type joint anchor bolt suitable for connectors of different types and specifications. By adjusting the position and size of the limiting protrusion 505, the installation requirements of different connectors can be met, thereby improving the versatility and adaptability of the product.

[0040] Furthermore, the end of the arc-shaped enlarged portion 101 has an anti-rotation protrusion 103, and a plurality of anti-rotation protrusions 103 are arranged in an array.

[0041] In this embodiment, the end of the arc-shaped expansion portion 101 has an anti-rotation protrusion 103, and the anti-rotation protrusion 103 is arranged in a plurality of rows. During the installation of the longitudinal self-expanding and fastening type joint anchor, when a pulling force is applied to the core rod 1 to expand the expansion tube 3, the core rod 1 may be subjected to a reaction force and rotate. The function of the anti-rotation protrusion 103 is to prevent the core rod 1 from rotating in this case, ensuring that the expansion tube 3 can expand evenly and tightly combine with the top wall of the building. At the same time, during the connection between the connector and the threaded barrel 5 and the subsequent use process, the anti-rotation protrusion 103 can also prevent the core rod 1 from accidentally rotating, thereby maintaining the stability of the longitudinal self-expanding and fastening type joint anchor. The anti-rotation protrusion 103 can increase the friction between the arc-shaped expansion portion 101 and the top wall of the building, further enhancing the anchoring effect. When the longitudinal self-expanding fastening type joint anchor bolt is subjected to external force, the anti-rotation protrusion 103 can prevent the rotation trend of the core rod 1, so that the anchoring force is more evenly distributed on the entire longitudinal self-expanding fastening type joint anchor bolt, and the bearing capacity of the longitudinal self-expanding fastening type joint anchor bolt is improved. The stable core rod 1 can ensure the expansion effect of the expansion tube 3 and the reliability of the connection, thereby improving the installation quality. Reduce the problem of loose installation or uneven expansion caused by the rotation of the core rod 1, and ensure that the longitudinal self-expanding fastening type joint anchor bolt can be effectively fixed on the top wall of the building. The reliable anchoring effect can improve the safety of the building or equipment. The anti-rotation protrusion 103 can prevent the longitudinal self-expanding fastening type joint anchor bolt from loosening or failing due to external force during use, reducing the risk of safety accidents. Especially in some high-load and high-risk environments, such as the ceiling installation of high-rise buildings or the suspension of large equipment, the anti-rotation protrusion 103 can provide a stronger guarantee for the safety of personnel and equipment.

[0042] Furthermore, one end of the expansion tube 3 has a through groove 301, which is arranged in a plurality of circles. The expansion tube 3 has a clamping portion 302, which is arranged in a plurality of circles and is used for clamping with the external environment.

[0043] In this embodiment, 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 also has a clamping portion 302, which is also arranged in a plurality of circles and is used to clamp 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 setting 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 through grooves 301 arranged in a circle can make the expansion tube 3 expand evenly in all directions, ensuring the uniform distribution of the anchoring force. The clamping portion 302 is used to clamp with the external environment, further enhancing the stability of the expansion tube 3 in the top wall of the building. When the expansion tube 3 is expanded, the clamping portion 302 and the structure of the top wall are mutually clamped to prevent the expansion tube 3 from loosening or shifting when subjected to external force. The clamping portion 302 arranged in a circle can provide clamping force in all directions to improve the reliability of anchoring. The design of the through groove 301 and the clamping part 302 works together to significantly improve the anchoring force of the expansion tube 3. The longitudinal self-expanding and fastening joint anchor can be more firmly fixed on the top wall of the building and withstand greater tension and shear force. This enhanced anchoring force is particularly important for the installation of suspended ceilings or suspended parts that need to bear heavier loads. The clamping connection of the clamping part 302 with the external environment increases the stability of the expansion tube 3 and reduces the possibility of loosening of the longitudinal self-expanding and fastening joint anchor due to vibration or external force during use. Ensure the safety and reliability of the installation and extend the service life of the longitudinal self-expanding and fastening joint anchor. The design of the through groove 301 and the clamping part 302 can make the expansion tube 3 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 self-expanding and fastening joint anchor 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, making it easier to insert the core rod 1 and apply 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.

[0044] When it is necessary to temporarily hoist a small weight object, first, a hole of suitable size is made on the top wall of the building. The diameter of this hole should be slightly larger than the outer diameter of the expansion tube 3 so that the expansion tube 3 can be smoothly inserted. Insert the longitudinal self-expanding fastening type joint anchor with the expansion tube 3 into the hole. Since the clamping portion 302 on the expansion tube 3 is arc-shaped and bends toward the side away from the clearance groove 303, during the insertion process, the clamping portion 302 will be squeezed inward by the hole wall. When the expansion tube 3 is fully inserted into the hole, the clamping portion 302 will pop outward under the action of its own elasticity and be clamped with the hole wall. At this time, even if there is no further operation such as tightening the threaded tube 5, the longitudinal self-expanding fastening type joint anchor can also be temporarily fixed under the action of the clamping portion 302. Then, suitable connectors such as ropes, hooks, etc. can be selected as needed to connect the small weight object with the longitudinal self-expanding fastening type joint anchor to complete the temporary hoisting. At some decoration sites, it may be necessary to temporarily hoist some small tools or materials. For example, a small lamp is temporarily suspended on the ceiling for lighting, or some lighter decorative materials are temporarily lifted for installation and adjustment. At this time, the use of this longitudinal self-expanding fastenable joint anchor with a clamping portion 302 design can quickly achieve temporary fixation and improve work efficiency. In some temporary display activities, this longitudinal self-expanding fastenable joint anchor can also be used for temporary lifting of small weight items. For example, display boards, small decorations, etc. are hung on the ceiling or wall, and the design of the clamping portion 302 can ensure that the longitudinal self-expanding fastenable joint anchor provides stable support in a short time. The design of the clamping portion 302 makes it unnecessary for the longitudinal self-expanding fastenable joint anchor to perform complicated installation operations when temporarily lifting small weight items, and it only needs to be inserted into the hole to achieve temporary fixation. This greatly saves installation time and improves work efficiency. For some emergency situations where a temporary lifting system needs to be quickly built, this quick installation feature is particularly important. Since temporary fixation can be achieved without using other components such as the threaded barrel 5, this longitudinal self-expanding fastenable joint anchor is more flexible in use. It is possible to choose whether to perform further tightening operations according to different needs and on-site conditions to meet various temporary lifting requirements. In some places where space is limited or it is inconvenient to perform complex installation operations, the lifting requirements 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 self-expanding and fastening type joint anchor bolt installation tools and materials, which can save costs. Only a longitudinal self-expanding and fastening type joint anchor bolt 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, and improves economic benefits.

[0045] Furthermore, the expansion tube 3 has a clearance groove 303 , which is located at 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 .

[0046] In this embodiment, the expansion tube 3 has a clearance groove 303, and the clearance groove 303 is located on one side of the clamping part 302. The clamping part 302 is arc-shaped and bends toward the side away from the clearance groove 303. The clearance groove 303 provides a certain deformation space for the expansion tube 3 during the expansion process. When the core rod 1 is subjected to tension to expand the expansion tube 3, the material at the clearance groove 303 can flow to both sides, so that the clamping part 302 can be better bent outward and clamped with the external environment. At the same time, the clearance groove 303 can also reduce the resistance of the expansion tube 3 during the expansion process, making the expansion process smoother. The arc-shaped clamping part 302 can better fit the structure of the top wall of the building and increase the clamping force. When the expansion tube 3 expands, the arc-shaped clamping part 302 can be tightly clamped into the top wall to improve the stability of the anchoring. The design of bending toward the side away from the clearance groove 303 enables the clamping part 302 to play a more effective clamping role during the expansion process to prevent the expansion tube 3 from loosening. The cooperation of the clearance groove 303 and the arc-shaped clamping part 302 enables the expansion tube 3 to be more closely combined with the top wall of the building after expansion, significantly enhancing the anchoring effect. Ensure that the longitudinal self-expanding and fastening type joint anchor bolt can be firmly fixed on the top wall and withstand greater external forces. For some application scenarios with high requirements for anchoring force, such as heavy ceiling installation or fixation of large suspension equipment, this design can provide more reliable support. The design of the arc-shaped clamping part 302 can adapt to the top wall surface of the building with different shapes and roughness. Whether the top wall is flat or has certain unevenness, the arc-shaped clamping part 302 can be well clamped with it, which improves the adaptability of the longitudinal self-expanding and fastening type joint anchor bolt. The presence of the clearance groove 303 also enables the expansion tube 3 to play a better role 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 part 302 makes it easier to install the expansion tube 3 in place. The operator can more easily insert the core rod 1 into the expansion tube 3, and expand the expansion tube 3 and clamp it on the top wall by applying a pulling force. If adjustments are required during the installation process, this design also facilitates fine-tuning the position and expansion degree of the expansion tube 3, thereby improving the accuracy and efficiency of the installation.

[0047] Furthermore, 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 a through groove 301 in a straight line.

[0048] In this embodiment, the expansion tube 3 has a deformation portion 304, and the deformation portion 304 is arranged in a circle, and a through groove 301 is formed in a straight line 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 the uniform distribution of the anchoring force. A through groove 301 is formed in a straight line between two adjacent deformation portions 304, and 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 part 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 self-expanding and fastening type joint anchor bolt. In various complex use environments, the longitudinal self-expanding and fastening type joint anchor bolt can better withstand external forces and reduce the risk of loosening and displacement. For the installation of suspended ceilings or suspended parts that require long-term fixation, this design to improve the anchoring stability is particularly important. During the installation process, the presence of the deformation part 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 part 304 can make the expansion tube 3 gradually adapt to the shape and size of the hole, thereby improving the accuracy and efficiency of the installation.

[0049] Furthermore, the clamping portion 302 is located in the middle of the deformation portion 304 .

[0050] 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. The clamping portion 302 is arranged in the middle of the deformation portion 304, so that the clamping portion 302 can better cooperate with the deformation portion 304 during the expansion process. The deformation of the deformation portion 304 will make the clamping portion 302 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 play its clamping role to prevent 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 distribution of the anchoring force on the expansion tube 3 is more uniform. The stress generated by the deformation portion 304 during the expansion process can be transmitted to different positions of the top wall of the building through the clamping portion 302, thereby increasing the friction and anchoring force between the longitudinal self-expanding and fastening type joint anchor bolt and the top wall. This uniform distribution of anchoring force can improve the overall bearing capacity of the longitudinal self-expanding fastenable joint anchor bolt, enabling it to withstand greater tension and shear forces.

[0051] The optimized cooperation between the clamping part 302 and the deforming part 304 can ensure the reliability of the longitudinal self-expanding fastening type joint anchor during the installation process. When the expansion tube 3 is inserted and the tension is applied, the clamping part 302 can quickly engage with the top wall, and the expansion of the deforming part 304 can also provide stable support, reducing the uncertainty during the installation process.

[0052] In different use environments, the material and structure of the building top wall may be different. The design of the clamping portion 302 being located in the middle of the deformation portion 304 can make the longitudinal self-expanding fastening type joint anchor bolt better adapt to various working conditions. Whether on the top wall of concrete, masonry or other materials, this design can ensure the expansion and clamping effect of the expansion tube 3, and improve the versatility of the longitudinal self-expanding fastening type joint anchor bolt.

[0053] Example 2 Reference Figure 9~Figure 11 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: further, the clamping portion 302 is located between the deformation portion 304 and the end of the expansion tube 3.

[0054] In this embodiment, when the expansion tube 3 expands under the action of the core rod 1, the deformation part 304 is deformed first. The clamping part 302 is located between the deformation part 304 and the end of the expansion tube 3, so that during the expansion process, the clamping part 302 can be more closely in contact with the top wall of the building and clamped. This positional relationship can increase the friction and clamping force between the expansion tube 3 and the top wall, thereby improving the anchoring stability of the longitudinal self-expanding fastening type joint anchor bolt, ensuring that it will not easily loosen or fall off when subjected to external force. The deformation of the deformation part 304 will produce a certain thrust on the clamping part 302, so that the clamping part 302 is better embedded in the top wall. At the same time, the clamping part 302 will also play a certain limiting role in the expansion of the deformation part 304, preventing the expansion tube 3 from being damaged due to excessive expansion. This interaction can optimize the expansion effect of the expansion tube 3, so that it can achieve good anchoring under different top wall conditions. The reasonable position of the clamping part 302 can ensure that the longitudinal self-expanding fastening type joint anchor bolt can play a correct role during the installation process and improve the installation quality. Reduce the risk of anchor instability or failure due to improper installation and ensure the safety of buildings or equipment.

[0055] Furthermore, the clamping portion 302 is an elastic clamping portion.

[0056] In this embodiment, the clamping part 302 is an elastic clamping part. The elastic clamping part can adapt to installation holes of different diameters to a certain extent. When inserting the expansion tube 3, the elastic clamping part can facilitate the operator to push it into the hole.

[0057] Furthermore, the end of the deformation portion 304 may have an arc-shaped inner concave portion 305 .

[0058] In this embodiment, the end of the deformation part 304 has an arc-shaped inner recess 305. When the expansion tube 3 is subjected to the tensile force of the core rod 1, the deformation part 304 begins to deform. The design of the arc-shaped inner recess 305 makes the deformation part 304 easier to bend and expand during the expansion process. This arc-shaped structure can guide the direction of deformation, make the expansion more uniform and controllable, and improve the expansion effect of the expansion tube 3. The arc-shaped inner recess 305 can better fit the top wall of the building after expansion. The contact area between the expansion tube 3 and the top wall is increased, thereby increasing the friction and anchoring force. This close contact can effectively prevent the expansion tube 3 from loosening or shifting during use, and enhance the stability of the longitudinal self-expanding and fastening type joint anchor bolt. The arc shape can disperse stress and avoid stress concentration at the end of the deformation part 304. This helps to improve the strength and durability of the expansion tube 3 and extend the service life of the longitudinal self-expanding and fastening type joint anchor bolt. When subjected to a large external force, the arc-shaped inner concave portion 305 can better withstand the pressure and reduce the risk of damage to the expansion tube 3. The design of the arc-shaped inner concave portion 305 enables the longitudinal self-expanding fastening type joint anchor bolt to provide a stronger anchoring force after installation. Whether in the installation of the ceiling or other suspended parts, the firmness and safety of the connection can be ensured. This enhanced anchoring effect is particularly important for application scenarios that need to withstand large weight or external forces.

[0059] Furthermore, the cross-sectional area of ​​the clamping portion 302 gradually decreases from the expansion tube 3 to the end of the clamping portion 302 .

[0060] In this embodiment, in the longitudinal self-expanding fastening type joint anchor, the cross-sectional area of ​​the clamping part 302 gradually decreases from the expansion tube 3 to the end of the clamping part 302. This gradually decreasing cross-sectional area design makes it easier for the clamping part 302 to be inserted into the installation hole of the top wall of the building. The smaller cross-sectional area at the front end of the clamping part 302 can reduce the resistance during insertion, so that the expansion tube 3 can be smoothly inserted into the hole. It helps to improve the efficiency of installation and reduce the difficulties and time consumption during the installation process. When the expansion tube 3 is inserted into the hole and expands, the clamping part 302 will contact the hole wall and generate a clamping force. As the cross-sectional area of ​​the clamping part 302 gradually decreases, its contact area with the hole wall will gradually increase, thereby enhancing the clamping effect. This gradually increasing clamping force can ensure that the longitudinal self-expanding fastening type joint anchor will not easily loosen or fall off during use, thereby improving the stability and reliability of the anchoring. The gradual reduction in the cross-sectional area of ​​the clamping part 302 enables the longitudinal self-expanding fastening type joint anchor to adapt to installation holes of different diameters to a certain extent. For slightly larger or smaller holes, the clamping portion 302 can be deformed to adjust the contact state with the hole wall, thereby improving the versatility of the longitudinal self-expanding fastening type joint anchor bolt. It is very useful in actual construction, reducing installation problems caused by hole diameter deviation. Smooth insertion and strong clamping effect can ensure the installation quality of the longitudinal self-expanding fastening type joint anchor bolt. It reduces uncertainty and errors in the installation process, allowing the longitudinal self-expanding fastening type joint anchor bolt to better play its anchoring role.

[0061] 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.

[0062] In this embodiment, the two ends of the cross section of the clamping portion 302 parallel to the axial direction of the expansion tube 3 are acute angled. When the expansion tube 3 is inserted into the mounting hole and expands, the acute angled ends can be better embedded in the hole wall. This sharp shape increases the friction and bite force between the clamping portion 302 and the hole wall, thereby improving the stability of the clamping connection. Even when subjected to external force, the acute angled clamping portion 302 is not easy to slip off from the hole wall, ensuring that the longitudinal self-expanding fastening type joint anchor can be firmly fixed on the building top wall. Different building top wall materials and apertures may affect the clamping effect of the longitudinal self-expanding fastening type joint anchor. The acute angled clamping portion 302 can adapt to the aperture changes within a certain range and the hole walls of different materials, thereby improving the versatility of the longitudinal self-expanding fastening type joint anchor. For some relatively rough or uneven hole walls, the acute angled clamping portion 302 can better adapt to its surface shape and increase the clamping force. During the installation process, the acute angled clamping portion 302 can be more easily inserted into the mounting hole. Its sharp end can reduce the resistance when inserting into the hole 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 expansion, the sharp-angled clamping part 302 will quickly clamp with the hole wall, improving the efficiency and accuracy of installation. The stable clamping effect can ensure the installation quality of the longitudinal self-expanding and fastening type joint anchor bolt. It reduces the safety hazards caused by loose clamping and improves the stability and reliability of buildings or equipment. Reliable clamping stability reduces the risk of loosening and falling off of the longitudinal self-expanding and fastening type joint anchor bolt during use. This means that the frequency of maintenance and replacement is reduced, and the maintenance cost is reduced.

[0063] Furthermore, 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. One end of the threaded tube 5 has a tapered surface 506 . Both ends of the expansion tube 3 have a deformation portion 304 . The tapered surface 506 abuts against the deformation portion 304 .

[0064] In this embodiment, the radial angle between the bottom surface of the end of the clamping part 302 and the expansion tube 3 is less than or equal to 90 degrees, and the angle between the end of the clamping part 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 part 302 and the expansion tube 3 is less than or equal to 90 degrees, so that the clamping part 302 can better contact the hole wall after being inserted into the installation hole. The smaller angle increases the fit between the clamping part 302 and the hole wall and improves the clamping force. The angle between the end of the clamping part 302 and the axis of the expansion tube 3 is less than or equal to 45 degrees, so that the clamping part 302 can interact with the hole wall at a more suitable angle when the expansion tube 3 expands. This angle design helps to enhance the stability of the clamping part 302 and prevent it from loosening or slipping when subjected to force. The abutment between the conical surface 506 and the deformation part 304 enables the expansion tube 3 to achieve multiple locking. The optimized clamping angle can enable the longitudinal self-expanding fastening type joint anchor to generate a greater anchoring force on the top wall of the building. The tight fit and stable connection between the clamping part 302 and the hole wall ensure that the longitudinal self-expanding fastening type joint anchor bolt can withstand greater tension and shear force, thereby improving the reliability of the connection. This enhanced anchoring force is particularly important for application scenarios that require heavy loads, such as the suspension of large equipment or the connection of important structures.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. 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, which should all be included in the scope of the claims of the present invention.

Claims

1. A longitudinal self-expanding fastening type joint anchor bolt, which is used to connect the top wall of a building with a connecting piece, and is characterized in that: include A core rod (1), wherein the core rod (1) has an external threaded portion (2), an expansion tube (3), wherein the expansion tube (3) is sleeved on the core rod (1), A threaded barrel (5), wherein the threaded barrel (5) has an abutment portion, the abutment portion abuts against one end of the expansion tube (3), the threaded barrel (5) has an internal threaded through hole (501), the internal threaded through hole (501) has a first threaded portion (502) and a second threaded portion (503), the external threaded portion (2) is threadedly connected to the first threaded portion (502), the second threaded portion (503) is threadedly connected to the connecting piece, and the threaded barrel (5) has a top groove (504), and the top groove (504) is located at the end of the second threaded portion (503).

2. The longitudinal self-expanding fastenable joint anchor bolt according to claim 1, characterized in that: The end of the core rod (1) has an arc-shaped expansion portion (101), the radial cross-sectional area of ​​the arc-shaped expansion portion (101) gradually expands from the middle of the core rod (1) to one side of the end, the arc-shaped expansion portion (101) and the external threaded portion (2) are respectively located at two ends of the core rod (1), one end of the expansion tube (3) is in contact with the small end of the arc-shaped expansion portion (101), and the diameter of the large end of the arc-shaped expansion portion (101) is greater than the outer diameter of the threaded tube (5).

3. The longitudinal self-expanding fastenable joint anchor bolt according to claim 1, characterized in that: The top groove (504) is a straight-line or cross-shaped top groove.

4. The longitudinal self-expanding fastenable joint anchor bolt according to claim 2, characterized in that: The core rod (1) has a boss portion (102), and the boss portion (102) is located on a side of the external thread portion (2) close to the arc-shaped enlarged portion (101).

5. The longitudinal self-expanding fastenable joint anchor bolt according to claim 1, characterized in that: The threaded barrel (5) has a limiting protrusion (505), the limiting protrusion (505) is located between the first threaded portion (502) and the second threaded portion (503), and the limiting protrusion (505) is used to abut against an end of the connecting member.

6. The longitudinal self-expanding fastenable joint anchor bolt according to claim 2, characterized in that: The end of the arc-shaped enlarged portion (101) is provided with an anti-rotation protrusion (103), and a plurality of the anti-rotation protrusions (103) are arranged in an array.

7. The longitudinal self-expanding fastenable joint anchor bolt according to claim 1, characterized in that: The expansion tube (3) has a through groove (301) at one end, the through grooves (301) are arranged in a plurality of circles, the expansion tube (3) has a clamping portion (302), the clamping portion (302) is arranged in a plurality of circles and is used for clamping with the external environment, the expansion tube (3) has a clearance groove (303), 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), the expansion tube (3) has a deformation portion (304), the deformation portion (304) is arranged in a plurality of circles, and two adjacent deformation portions (304) form the through groove (301) in a straight line.

8. The longitudinal self-expanding fastenable joint anchor bolt according to claim 7, characterized in that: The clamping portion (302) is located in the middle of the deformation portion (304).

9. The longitudinal self-expanding fastenable joint anchor bolt according to claim 7, characterized in that: The clamping portion (302) is located between the deformation portion (304) and the end of the expansion tube (3).

10. The longitudinal self-expanding fastenable joint anchor bolt according to claim 7, characterized in that: The clamping portion (302) is an elastic clamping portion, the end of the deformation portion (304) has an arc-shaped inner concave portion (305), the cross-sectional area of ​​the clamping portion (302) gradually decreases from the expansion tube (3) to the end of the clamping portion (302), the two ends of the cross section of the clamping portion (302) parallel to the axial direction of the expansion tube (3) are acute-angled, 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, one end of the threaded barrel (5) has a tapered surface (506), both ends of the expansion tube (3) have the deformation portion (304), and the tapered surface (506) abuts against the deformation portion (304).

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