Novel after-fracture reconnection semi-rigid bolt-sphere joint

Abstract

The invention discloses a novel after-fracture reconnection semi-rigid bolt-sphere joint, and particularly relates to the technical field of steel frame structures. An expansion bolt barrel can be arranged on a limiting section of a bolt rod piece in a sleeving manner; a limiting groove is formed in the limiting sleeve, the sleeve with the pressure-bearing ball ring can be arranged on the limiting section in a sleeving mode, and the limiting groove and the limiting section are matched to limit rotation of the relative bolt rod piece relative to the sleeve with the pressure-bearing ball ring. The driving disc is positioned between the expansion bolt cylinder and the sleeve with the pressure-bearing ball ring; when the sleeve with the pressure-bearing ball ring slides in the length direction of the bolt rod piece, the driving disc is driven to slide in the length direction of the bolt rod piece, the expansion assisting section is inserted into the expansion branch, and one end of the expansion branch is expanded outwards. When the reconnection semi-rigid joint is pulled after being installed, pulling force is transmitted to the conical head through the rod piece, then the force is transmitted to the bolt rod piece through the expansion branches of the expansion bolt barrel, the force is transmitted to the bolt ball through the threaded section, and effective transmission of the pulling force is achieved.

Description

Technical Field

[0001] This invention relates to the field of steel frame structure technology, specifically to a novel semi-rigid bolt ball joint for post-fracture reconnection. Background Technology

[0002] Large-span spatial structures refer to architectural structures that span a space of more than 60 meters laterally. These structures primarily bear loads through a spatial force-bearing system, rather than solid walls or dense column grids. They mainly include types such as space frames, shell structures, cable-stayed structures, inflatable structures, and membrane structures. Through different mechanical forms, they achieve large-space coverage and are used in public buildings such as stadiums and exhibition centers.

[0003] Bolted ball joint space frames / shells are among the most widely used and mature forms of large-span spatial structures. Bolted ball joints can flexibly connect members in different directions and at different angles, perfectly adapting to the complex geometric relationships of spatial grid structures. The connection principle of bolted ball joints is as follows: First, a conical head or end plate with bolts is welded to both ends of the steel pipe member. A long hexagonal sleeve (or long hexagonal threadless nut) is fitted onto the threaded rod extending from the conical head or end plate. The bolt and sleeve are connected together with a pin or fastening screw. During assembly, the long hexagonal sleeve is directly screwed on, causing the bolt to rotate through the pin or fastening screw, thus screwing the bolt into the ball until the bolt head is tightly against the end plate or conical head. After all intersecting members are connected in this way, a joint is formed. The tightness of the bolts is controlled by the pin.

[0004] In the design and analysis of space frame structures, nodes are often simplified to ideal hinged nodes. However, bolted ball joints, widely used in practical engineering, exhibit significant semi-rigid characteristics. Engineering practice shows that when members undergo bending deformation or support displacement, bolted ball joints experience significant stress redistribution. During this process, the stress on high-strength bolts may transform from tensile / compressive stress to a complex combination of tensile / compressive and bending / shear stresses, leading to bending or fracture of the bolt shank.

[0005] Existing reinforcement methods for bent or broken bolt rods, such as direct replacement of the rod, cross-node reinforcement, and welding, are not only complex to construct and uneconomical, but may also have adverse effects on adjacent nodes during loading and unloading.

[0006] There are three problems with the existing new bolt ball joint design and reinforcement: (1) The design theory is not perfect and the semi-rigidity of the joint is not fully considered; (2) The reinforcement and repair technology is complicated to construct, has poor economic efficiency and has an adverse effect on adjacent joints; (3) It is difficult to repair existing joints after they are damaged and there is a lack of effective reconnection mechanism.

[0007] To address the aforementioned issues, there is an urgent need for a bolt ball joint reconnection device that is easy to install, has a clear force transmission mechanism, and meets the required bearing capacity. Summary of the Invention

[0008] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a novel semi-rigid bolt ball joint for post-break reconnection, solving at least one technical problem mentioned in the background art.

[0009] (II) Technical Solution To achieve the above objectives, the technical solution adopted by the present invention is as follows: A novel semi-rigid bolt ball joint for post-break reconnection, used to connect a bolt ball and a rod cone, the joint comprising: A bolt member, wherein the bolt member is sequentially configured as a threaded section, a limiting section, and a cylindrical section capable of being connected to a bolt ball thread; An expansion bolt sleeve, the expansion bolt sleeve including expansion limbs, and the expansion bolt sleeve being able to be sleeved on a limiting section; Drive disc, including expansion section; A pressure-bearing ball ring sleeve includes a limiting sleeve, wherein the limiting sleeve has a limiting groove inside, the pressure-bearing ball ring sleeve can be fitted onto the limiting section, and the limiting groove cooperates with the limiting section to restrict the rotation of the bolt rod relative to the pressure-bearing ball ring sleeve; The drive disc can be sleeved on the bolt member and is located between the expansion bolt cylinder and the sleeve with bearing ball ring; When the bearing ball ring sleeve slides along the length of the bolt rod, it drives the drive disc to slide along the length of the bolt rod, causing the expansion section to be inserted into the expansion segment and causing one end of the expansion segment to unfold outward.

[0010] Preferably, the expansion bolt sleeve further includes a sleeve, and the expansion segment includes a plurality of arc-shaped pieces arranged in a circumferential array along one end of the sleeve, with gaps between adjacent arc-shaped pieces, and the other end of the arc-shaped pieces is a free end.

[0011] Preferably, the inner side of the free end of the arc-shaped piece is provided with a first tilt angle, and the end of the expansion section is provided with a second tilt angle that cooperates with the first tilt angle.

[0012] Preferably, the drive disk further includes a disc and a shear-resistant section, wherein the shear-resistant section and the expansion-aiding section are located on both sides of the disc, respectively.

[0013] Preferably, one end of the limiting sleeve is provided with a pressure-bearing ball ring, the pressure-bearing ball ring is concentric with the bolt ball, and the inner surface of the pressure-bearing ball ring can fit against the outer surface of the bolt ball.

[0014] Preferably, the inner side of the other end of the limiting sleeve is provided with a conical groove, and the end of the shear-resistant section is provided with a third inclination angle that cooperates with the conical groove.

[0015] Preferably, the bolt member has a bolt head at its end, and when the expansion bolt sleeve is fitted in the limiting section, the outer side of the sleeve is in contact with the inner side of the bolt head.

[0016] Preferably, the bolt member limiting section is octagonal, and the limiting groove of the limiting sleeve is an inner octagon.

[0017] Beneficial effects This invention provides a novel semi-rigid bolted ball joint for post-fracture reconnection, which has the following advantages compared with the prior art: When the semi-rigid node is installed and subjected to tension, the tensile force is transmitted to the cone through the rod, then to the bolt rod through the expansion joint of the expansion bolt sleeve, and finally to the bolt ball through the threaded section, thus achieving effective transmission of tensile force.

[0018] When the semi-rigid node is installed and subjected to pressure, the pressure is transmitted to the cone head through the rod, and then to the conical groove with the bearing ball ring sleeve through the shear section of the drive disc. Finally, the pressure is transmitted to the bolt ball through the bearing ball ring sleeve, thus achieving effective pressure transmission.

[0019] When the reconnected semi-rigid node is subjected to bending moment after installation, the bending moment is transferred to the cone head through the members, and then transferred to the shear section of the bolt member and the drive plate through the expansion joint of the expansion bolt sleeve. The shear section of the drive plate transfers the bending moment to the conical groove of the sleeve with bearing ball ring, and finally to the bolt ball through the threaded section of the sleeve with bearing ball ring and the bolt member. During the bending moment transfer process, the sleeve with bearing ball ring converts the pure bending moment into the pressure and bending moment of the bolt ball through the bearing ball ring, which can improve the bending bearing capacity of the reconnected semi-rigid node. In addition, the tight fit between the shear section of the drive plate and the conical groove of the sleeve with bearing ball ring improves the bending bearing capacity of the drive plate and the sleeve with bearing ball ring, preventing failure at the weakest point of their contact. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 The initial state of the reconnected semi-rigid nodes; Figure 2 The semi-rigid nodes are in the open state after reconnection. Figure 3 This is a schematic diagram of the overall structure of the pressure-bearing ball ring sleeve; Figure 4 This is a schematic diagram of the overall structure of the drive disk; Figure 5 A schematic diagram of the overall structure of the expansion bolt cylinder; Figure 6This is a schematic diagram of the overall structure of the bolt member; Figure 7 Installation sequence for reconnecting semi-rigid nodes; Among them, bolt ball 1, rod cone head 2, rod 3; 4. Pressure-bearing ball ring sleeve, 41. Limiting sleeve, 42. Limiting groove, 43. Conical groove, 44; Drive disk 5, disc 51, shear-resistant section 52, expansion-aiding section 53; Expansion bolt sleeve 6, expansion limb 61, sleeve 62; Bolt rod 7, threaded section 71, limiting section 72, cylindrical section 73, bolt head 74. Specific implementation methods To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] To better understand the above technical solution, the following will provide a detailed description of the technical solution in conjunction with the accompanying drawings and specific implementation methods: As per the instruction manual Figures 1-7 As shown, this embodiment of the invention provides a novel semi-rigid bolt ball joint for reconnection after breakage, used to connect the bolt ball 1 and the rod 3. To facilitate the connection between the bolt ball 1 and the rod 3, a rod cone 2 is provided at the end of the rod 3. The purpose is to achieve reconnection of the bolt ball 1 and the rod 3 after breakage.

[0022] The node includes a bolt member 7, an expansion bolt sleeve 6, a drive disc 5, and a sleeve with a bearing ball ring 4. The bolt member 7 is sequentially configured with a threaded section 71, a limiting section 72, and a cylindrical section 73 that can be threadedly connected to the bolt ball 1. The expansion bolt sleeve 6 includes an expansion branch 61, and the expansion bolt sleeve 6 can be fitted onto the limiting section 72. The drive disc 5 includes an expansion aid section 53. The sleeve with a bearing ball ring 4 includes a limiting sleeve 42, and the limiting sleeve 42 has a limiting groove 43 inside. The sleeve with a bearing ball ring 4 can be fitted onto the limiting section 72, and the limiting groove 43 cooperates with the limiting section 72 to restrict the rotation of the bolt member 7 relative to the sleeve with a bearing ball ring 4. The drive disc 5 can be sleeved on the bolt rod 7 and is located between the expansion bolt cylinder 6 and the sleeve with bearing ball ring 4; When the bearing ball ring sleeve 4 slides along the length of the bolt rod 7, it drives the drive disc 5 to slide along the length of the bolt rod 7, causing the expansion section 53 to be inserted into the expansion limb 61, and causing one end of the expansion limb 61 to unfold outward.

[0023] When reconnecting the bolt ball 1 and the rod 3 after a break using the above-mentioned reconnection semi-rigid node, one end of the bolt rod 7 is inserted into the opening of the cone head 2 of the rod 3, and the threaded section 71 of the other end of the bolt rod 7 is screwed into the threaded opening of the bolt ball 1. When first inserted into the opening of the cone head 2, the expansion limb 61 of the expansion bolt cylinder 6 does not expand. At this time, the reconnecting semi-rigid node can freely enter and exit the opening of the cone head 2. After insertion into the opening of the cone head 2, the lower end of the reconnecting semi-rigid node is screwed into the threaded opening of the bolt ball 1. Next, the bearing ball ring sleeve 4 is turned. Since the bearing ball ring sleeve 4 and the bolt rod 7 can only rotate together, turning the bearing ball ring sleeve 4 will drive the bolt rod 7 to rotate, causing the threaded section 71 of the bolt rod 7 to be screwed into the cone head 2. This shortens the distance between the bolt ball 1 and the cone head 2. The bearing ball ring sleeve 4 pushes the drive disc 5 to slide along the bolt rod 7, driving the expansion aid section 53 to gradually insert into the expansion limb 61. During the turning process, the expansion limb 61 of the expansion bolt cylinder 6 gradually opens and gradually moves towards the cone head bolt hole as a whole until the expansion limb 61 of the expansion bolt cylinder 6 opens to the lower end. Figure 2 As shown, at this time, due to the opening of the expansion limb 61 of the expansion bolt cylinder 6, the reconnection semi-rigid node and the bolt hole of the cone head 2 achieve a tight mechanical engagement between the rod 3 and the bolt ball 1, thereby realizing the reconnection of the cone head 2 and the bolt ball 1 of the rod 3 by using the reconnection semi-rigid node.

[0024] Furthermore, in order to better assemble the reconnected semi-rigid nodes, the aforementioned drive disk 5 also includes a disk 51 and a shear-resistant section 52, wherein the shear-resistant section 52 and the expansion-aid section 53 are located on both sides of the disk 51, respectively.

[0025] Furthermore, the bolt rod 7 is provided with a bolt head 74 at its end, and when the expansion bolt sleeve 6 is sleeved on the limiting section 72, the outer side of the sleeve 62 is in contact with the inner side of the bolt head 74.

[0026] Furthermore, such as Figure 3 As shown in Figure 4, the inner side of the other end of the limiting sleeve 42 is provided with a conical groove 44, and the end of the shear-resistant section 52 is provided with a third inclination angle that cooperates with the conical groove 44. The rotation of the pressure-bearing ball ring sleeve 4 is converted into the axial movement of the drive disc 5 through the conical surface cooperation.

[0027] like Figure 7 As shown, the above-mentioned reconnected semi-rigid nodes are assembled as follows: Step 1: Prepare bolt rod 7; Step 2: The expansion bolt sleeve 6 is fitted onto the bolt member 7. At this time, the sleeve 62 of the expansion bolt sleeve 6 is in contact with the bolt head 74 of the bolt member 7, and the sleeve 62 is fitted onto the cylindrical section 73. Step 3: Next, the drive disc 5 is fitted onto the bolt member 7. In the specific implementation process, the drive disc 5 includes a disc 51, a shear-resistant section 52, and an expansion-aiding section 53, wherein the shear-resistant section 52 and the expansion-aiding section 53 are located on both sides of the disc 51, respectively. At this time, the expansion-aiding section 53 of the drive disc 5 is in close contact with the expansion limb 61 of the expansion bolt cylinder 6; Step 4: Finally, the bearing ball ring sleeve 4 is put onto the bolt member 7. At this time, the limiting section 72 of the bolt member 7 is tightly engaged with the limiting groove 43 of the bearing ball ring sleeve 4. At the same time, the shear section 52 of the drive disc 5 is tightly engaged with the conical groove 44 of the bearing ball ring sleeve. At this time, the reconnection semi-rigid node assembly is completed.

[0028] In the above embodiment, to facilitate the tightening of the pressure-bearing ball-ring sleeve 4 with a wrench, the outer surface of the pressure-bearing ball-ring sleeve 4 is provided with an octagonal structure, which can be easily tightened with a wrench. Furthermore, the octagonal shape results in a smaller enlargement ratio of the circumscribed circle, saving steel. When the pressure-bearing ball-ring sleeve 4 is tightened with a wrench, the cone 2 and the bolt ball 1 move closer together, thereby allowing the expansion section 53 to insert into the expansion limb 61, causing the expansion limb 61 to gradually open.

[0029] Furthermore, regarding component connections, during installation, the limiting groove 43 of the bearing ball ring sleeve 4 and the limiting section 72 of the bolt member 7 are tightly fitted together, thus enabling the bolt member 7 to be screwed into the bolt ball 1 when the bearing ball ring sleeve 4 is turned. Specifically, the limiting section 72 can be set as an octagonal structure, and the limiting groove 43 is also set as an octagonal groove; the conical groove 44 of the bearing ball ring sleeve 4 is tightly fitted with the shear-resistant section 52 of the drive disc 5, thus enabling the reconnected semi-rigid node to have higher bending and shear bearing capacity. The expansion limbs 61 of the expansion bolt cylinder 6 and the expansion aid section 53 of the drive disc 5 are tightly fitted together, thereby promoting the opening of the expansion limbs 61 of the expansion bolt cylinder 6 and achieving mechanical connection with the cone head 2.

[0030] Furthermore, in order to better achieve expansion and stretching, such as Figure 5 As shown, the expansion bolt sleeve 6 also includes a sleeve 62, and the expansion limb 61 includes a plurality of arc-shaped pieces arranged in a circumferential array along one end of the sleeve 62, with gaps between adjacent arc-shaped pieces, and the other end of the arc-shaped pieces is a free end. Specifically, the arc-shaped pieces and the sleeve 62 can be integrally formed, such as by adopting an integral tubular structure and forming it by cutting.

[0031] When the threaded section 71 of the bolt member 7 is fully screwed into the bolt ball 1, the bolt head 74 of the bolt member 7 forces the expansion limb 61 to open up the arc-shaped piece in the expansion limb 61 under the squeezing action of the expansion aid section 53 of the drive disc 5, thereby causing the arc-shaped piece to expand outward. Figure 2 As shown, the outwardly expanding arc-shaped end abuts against the inner wall of the cone head 2, thereby limiting the bolt member 7. The expansion bolt cylinder 6 can be made of 40Cr steel, and after heat treatment, it can meet the 10.9 grade requirement. This structure and material can ensure both opening and load-bearing capacity.

[0032] Furthermore, to facilitate the insertion of the expansion-aiding segment 53 into the expansion limb 61, such as... Figure 4 and Figure 5 As shown, a first inclination angle is provided on the inner side of the free end of the arc-shaped piece, and a second inclination angle is provided at the end of the expansion-aiding section 53. The interaction of these two inclination angles guides the insertion direction and achieves a gradual expansion effect. The first inclination angle on the inner side of the free end of the arc-shaped piece and the second inclination angle at the end of the expansion-aiding section 53 first contact each other during the initial insertion stage. These two cooperating inclined surfaces form a guide surface, which can automatically correct minor alignment deviations and guide the expansion-aiding section 53 smoothly into the predetermined position of the expansion limb 61. The inclination angle design continuously and smoothly transforms the axial insertion motion into a radial expansion component through the contact of the inclined surfaces, achieving a gradual expansion from local to overall, and from small to large. Abrupt expansion would cause extreme stress concentration on the contact line or contact point, leading to plastic deformation or even crushing damage to the arc-shaped piece. The gradual process provided by the inclination angle allows the expansion force to be gradually transmitted and dispersed along the contact inclined surface, allowing the arc-shaped piece to deform more uniformly and controllably, fundamentally avoiding structural damage caused by stress concentration. By guiding the orderly deformation of the structure, the generation and propagation of microcracks are effectively suppressed, ensuring the structural integrity and fatigue life of the arc-shaped sheet.

[0033] Furthermore, such as Figure 3 As shown, a pressure-bearing ball ring 41 is provided at one end of the sleeve 4 with a pressure-bearing ball ring. The pressure-bearing ball ring 41 is concentric with the bolt ball 1, and its inner surface can completely fit with the outer surface of the bolt ball 1. Geometrically, the pressure-bearing ball ring 41 can be regarded as an annular curved surface structure obtained by cutting a complete sphere through two parallel planes. It resembles a spherical crown but is cut off with a plane at the closed end, which not only retains the good fitting characteristics of the spherical surface, but also facilitates the assembly with the bolt rod 7.

[0034] When the reconnected semi-rigid node is installed and subjected to bending moment, the bending moment transmission path is as follows: The bending moment is first transmitted from member 3 to cone 2, and then through the expansion branch 61 of expansion bolt sleeve 6 to bolt member 7 and shear section 52 of drive disc 5. Subsequently, shear section 52 of drive disc 5 further transmits the bending moment to the conical groove 44 of sleeve with bearing ball ring 4. Finally, the bending moment is transmitted to bolt ball 1 through threaded section 71 of sleeve with bearing ball ring 4 and bolt member 7.

[0035] During this moment transfer process, the bearing ball ring sleeve 4, through the curved surface contact between the bearing ball ring 41 and the bolt ball 1, transforms the pure bending moment into a combined stress state of pressure and bending moment acting on the bolt ball 1. This mechanical transformation mechanism significantly improves the bending load-bearing capacity of the joint. Simultaneously, the shear section 52 of the drive disc 5 and the conical groove 44 of the bearing ball ring sleeve 4 are tightly fitted, not only enhancing the moment transfer efficiency between them but also effectively preventing potential localized damage in this weak contact area, further ensuring the integrity and reliability of the joint under bending conditions.

[0036] In summary, according to the embodiments of the present invention, when the semi-rigid node is installed and subjected to tension, the tension is transmitted to the cone head 2 through the rod 3, then to the bolt rod 7 through the expansion branch 61 of the expansion bolt cylinder 6, and finally to the bolt ball 1 through the threaded section 71 of the bolt rod 7, thereby achieving effective transmission of tension.

[0037] When the semi-rigid node is installed and subjected to pressure, the pressure is transmitted to the cone head 2 through the rod 3, and then to the conical groove 44 with the bearing ball ring sleeve 4 through the shear section 52 of the drive disc 5. Finally, the pressure is transmitted to the bolt ball 1 through the bearing ball ring 41 with the bearing ball ring sleeve 4, thus realizing the effective transmission of pressure.

[0038] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A novel semi-rigid bolt ball joint for reconnection after fracture, used for connecting a bolt ball (1) and a rod cone (2), characterized in that, The nodes include: Bolt member (7), wherein the bolt member (7) is sequentially configured as a threaded section (71), a limiting section (72), and a cylindrical section (73) that can be threadedly connected to the bolt ball (1); Expansion bolt sleeve (6), the expansion bolt sleeve (6) includes expansion limbs (61), and the expansion bolt sleeve (6) can be sleeved on the limiting section (72). The drive disk (5) includes an expansion section (53); The pressure-bearing ball ring sleeve (4) includes a limiting sleeve (42), the limiting sleeve (42) is provided with a limiting groove (43) inside, the pressure-bearing ball ring sleeve (4) can be sleeved on the limiting section (72), and the limiting groove (43) cooperates with the limiting section (72) to restrict the bolt rod (7) from rotating relative to the pressure-bearing ball ring sleeve (4); The drive disc (5) can be sleeved on the bolt rod (7) and is located between the expansion bolt cylinder (6) and the sleeve with bearing ball ring (4); When the bearing ball ring sleeve (4) slides along the length of the bolt rod (7), it drives the drive disc (5) to slide along the length of the bolt rod (7), so that the expansion section (53) is inserted into the expansion limb (61), and one end of the expansion limb (61) unfolds outward.

2. The novel semi-rigid bolt ball joint for post-fracture reconnection according to claim 1, characterized in that... It lies in: The expansion bolt cylinder (6) also includes a sleeve (62), and the expansion limb (61) includes a plurality of arc-shaped pieces arranged in a circumferential array along one end of the sleeve (62), with gaps between adjacent arc-shaped pieces, and the other end of the arc-shaped pieces is a free end.

3. The novel semi-rigid bolt ball joint for post-break reconnection according to claim 2, characterized in that: The free end of the arc-shaped piece is provided with a first tilt angle, and the end of the expansion section (53) is provided with a second tilt angle that matches the first tilt angle.

4. The novel semi-rigid bolt ball joint for post-break reconnection according to claim 1, characterized in that: The drive disk (5) also includes a disk (51) and a shear-resistant section (52), wherein the shear-resistant section (52) and the expansion-supporting section (53) are located on both sides of the disk (51).

5. The novel semi-rigid bolt ball joint for post-break reconnection according to claim 1, characterized in that: One end of the limiting sleeve (42) is provided with a pressure bearing ball ring (41), which is concentric with the bolt ball (1), and the inner side of the pressure bearing ball ring (41) can fit against the outer side of the bolt ball (1).

6. The novel semi-rigid bolt ball joint for post-break reconnection according to claim 4, characterized in that: The inner side of the other end of the limiting sleeve (42) is provided with a conical groove (44), and the end of the shear-resistant section (52) is provided with a third inclination angle that cooperates with the conical groove (44).

7. The novel semi-rigid bolt ball joint for post-break reconnection according to claim 1, characterized in that: The bolt rod (7) is provided with a bolt head (74) at its end, and when the expansion bolt sleeve (6) is sleeved on the limiting section (72), the outer side of the sleeve (62) is in contact with the inner side of the bolt head (74).

8. The novel semi-rigid bolt ball joint for post-fracture reconnection according to claim 1, characterized in that, The limiting section (72) of the bolt rod (7) is octagonal, and the limiting groove (43) of the limiting sleeve (42) is an inner octagon.

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