Single-side bolt hollow bolt ball net rack connecting node and net rack connecting method

Abstract

The present application relates to bolt ball net rack technical field, specifically to single side bolt hollow bolt ball net rack connecting node and net rack connecting method. Including hollow bolt ball, the hollow bolt ball is equipped with through hole, the through hole is connected with the adjacent rod piece end through the connecting mechanism; The connecting mechanism includes high strength bolt, one end of the high strength bolt passes through sleeve, metal washer, rubber washer, slotted sleeve and small taper head in turn; The sleeve and metal washer are arranged between the rod piece and the hollow bolt ball, the sleeve drives the high strength bolt to rotate; Small taper head is arranged at one end of high strength bolt in hollow bolt ball, and the small taper head is in threaded engagement with the high strength bolt; One end of slotted sleeve is arranged in the through hole of hollow bolt ball, and the slotted end is located at one end towards small taper head. It is light in weight, convenient to construct, high in bearing capacity, and wide in application range.

Description

Technical Field

[0001] This invention relates to the field of bolted ball space frame technology, specifically to a single-sided bolted hollow bolted ball space frame connection node and a space frame connection method. Background Technology

[0002] In recent years, with the rapid development of the construction industry, space frame structures have been widely used in projects requiring large-span buildings such as stadiums and railway stations due to their significant characteristics of high strength and lightweight, as well as their outstanding advantages of rapid construction and convenient assembly, coupled with their good flexibility and plasticity.

[0003] Currently, hollow welded ball joints and bolted ball joints are the most common joint types in the construction of space frame structures. In-depth research reveals that welded ball joints require extensive on-site welding during actual construction. However, the complex and variable construction environment, filled with unstable factors such as humidity, wind, and dust, makes precise control of the welding environment difficult. This makes weld quality control a major challenge, leading to a series of thorny construction problems such as weld cracking and welding deformation, which significantly negatively impact the overall quality and progress of the project.

[0004] In comparison, while traditional solid bolt ball joints have achieved standardization and prefabricated construction to a certain extent and possess reliable mechanical properties, their inherent limitations cannot be ignored. Current engineering practice shows that, due to the weight limitations of solid bolt balls, it is difficult to manufacture them into larger sizes, fundamentally limiting the number of members they can connect, and thus failing to meet the needs of some construction projects with more stringent requirements for structural complexity and large spans.

[0005] Further research revealed new problems when introducing the hollow bolt ball concept. To meet the anchorage strength requirements of the threaded hole, national standards stipulate that the thread anchorage length of the bolt must be greater than 1.1 times the bolt diameter to ensure sufficient stability and reliability of the joint structure, necessitating a thicker spherical wall. In this situation, when using threaded anchorage, a non-ideal failure mode is highly likely to occur: the thread fails before the bolt reaches its ultimate tensile strength. This failure not only results in a waste of material resources but, more importantly, poses a serious threat to structural safety, significantly hindering the large-scale application of hollow bolt ball joints. Summary of the Invention

[0006] To address the problems existing in the background art, the present invention discloses a single-sided bolt hollow bolt ball joint and a space frame connection method.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A single-sided bolted hollow bolt ball space frame connection node, comprising a hollow bolt ball, the hollow bolt ball having a through hole, the through hole being connected to the end of an adjacent member via a connection mechanism;

[0009] The connecting mechanism includes a high-strength bolt, one end of which passes through a sleeve, a metal washer, a rubber washer, a slotted sleeve, and a small cone in sequence;

[0010] The sleeve and metal washer are placed between the rod and the hollow bolt ball, and the sleeve drives the high-strength bolt to rotate.

[0011] The small cone is located at one end of the high-strength bolt inside the hollow bolt ball, and the small cone and the high-strength bolt are threaded together.

[0012] One end of the slotted sleeve is set inside the through hole of the hollow bolt ball, and its slotted end is located at the end facing the small cone.

[0013] In the initial state, the metal washer, rubber washer, and slotted sleeve are in a tight fit, and there is no relative rotation between the three.

[0014] One end of the small cone is inserted into the open end of the slotted sleeve. Under the constraint of the slotted sleeve, the small cone can only move along the axial direction of the high-strength bolt and cannot rotate with the high-strength bolt.

[0015] In this invention, the sleeve is located on the outer side of the high-strength bolt, and a pin hole is provided inside the sleeve. The corresponding high-strength bolt is provided with a pin groove extending along the axial direction. The pin passes through the pin hole and the pin groove in sequence, and the pin is slidably disposed in the pin groove.

[0016] The rubber washer is placed inside the through hole of the hollow bolt ball;

[0017] The slotted sleeve has several long slots extending axially on the side facing the small cone, and these long slots are spaced apart circumferentially along the slotted sleeve.

[0018] The dimension of the end of the small cone tip facing the hollow bolt ball through hole is smaller than the dimension of the end of the small cone tip facing away from the hollow bolt ball through hole, and the dimension of the end of the small cone tip facing the hollow bolt ball through hole is smaller than the diameter of the through hole.

[0019] This invention also discloses a method for connecting space frames using the above-mentioned single-sided bolt hollow bolt ball space frame connection node, comprising the following steps:

[0020] S1. Drill a through hole in the hollow bolt ball;

[0021] S2. One end of the high-strength bolt is connected to the rod, and the other end of the high-strength bolt passes through the sleeve, metal washer, rubber washer, slotted sleeve and small cone in sequence, and extends into the hollow bolt ball through the through hole. The sleeve and the high-strength bolt are connected by a pin.

[0022] S3. Fix the metal washer and tighten the sleeve at the same time. The sleeve drives the high-strength bolt to rotate, and the small cone head moves towards the through hole of the hollow bolt ball. The slotted end of the slotted sleeve gradually opens up.

[0023] When the small cone continues to move until the slit end of the slit sleeve can no longer be opened, the squeezing action of the small cone achieves a fixed connection between the slit sleeve and the through hole of the hollow bolt ball. At the same time, the small cone is clamped and fixed inside the slit sleeve. The slit sleeve, the through hole of the hollow bolt ball, and the small cone are fixedly connected as one unit, thereby achieving a fixed connection between the connecting mechanism and the hollow bolt ball.

[0024] S4. Continue to tighten the sleeve. At this time, the distance between the hollow bolt ball and the rod gradually decreases. When the sleeve can no longer rotate, the sleeve is locked between the hollow bolt ball and the rod, thereby achieving a fixed connection between the hollow bolt ball and the rod.

[0025] S5. The space frame includes several connection nodes. Adjacent connection nodes are connected by rods. By taking steps S1 to S3, the ends of each rod are fixedly connected to the connection nodes, thus completing the installation of the space frame.

[0026] Secure the wrench to the outside of the metal washer and use the wrench to prevent the metal washer from rotating with the high-strength bolt. At this time, the friction between the metal washer and the rubber washer, as well as the friction between the slotted sleeve and the rubber washer, will keep the slotted sleeve locked in place.

[0027] Secure the digital torque wrench to the outside of the socket, and use the digital torque wrench to rotate the socket, which in turn rotates the high-strength bolt.

[0028] In step S3, as the sleeve drives the high-strength bolt to rotate, the small cone head does not rotate with the high-strength bolt under the constraint of the slotted sleeve.

[0029] The small cone head, through tooth meshing with the high-strength bolt, generates axial movement towards the through hole of the hollow bolt ball.

[0030] In step S4, as the sleeve continues to tighten, the high-strength bolt rotates with the sleeve and generates axial movement towards the hollow bolt ball, thereby driving the rod to move towards the hollow bolt ball, and gradually reducing the distance between the rod and the hollow bolt ball.

[0031] The beneficial effects of this invention are as follows:

[0032] (1) The hollow bolt ball joint proposed in this invention reduces the amount of steel used in the structure compared with the solid bolt ball joint, which can save economic costs and is lightweight, making it suitable for construction projects with complex structures.

[0033] (2) Through holes can be directly opened on the hollow bolt ball of the present invention, which is more convenient to construct than opening threaded holes;

[0034] (3) The present invention adopts a connection method of opening the sleeve to expand the anchorage and increasing the friction of the high-strength bolt and the hollow bolt ball wall, which avoids the problem of insufficient bolt thread anchorage length caused by the limitation of the hollow bolt ball wall thickness. Compared with the hollow bolt ball of the thread anchorage method, the ball wall thickness can be further reduced, and the amount of steel used in the structure can be reduced.

[0035] (4) The combination of the slotted sleeve and the high-strength bolt of the present invention can improve the shear resistance of the high-strength bolt, thereby improving the load-bearing capacity of the structure. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0037] Figure 2 This is a schematic diagram showing the connection relationship between the hollow bolt ball and the rod of the present invention;

[0038] Figure 3 This is a schematic cross-sectional view of the connection between the hollow bolt ball and the rod of the present invention;

[0039] Figure 4 This is an exploded view of the connection structure between the hollow bolt ball and the rod of the present invention;

[0040] Figure 5 This is a schematic diagram of the installation of the present invention.

[0041] The following are the labels in the diagram: 1. Hollow bolt ball; 2. Rod; 3. Large cone head; 4. High-strength bolt; 5. Sleeve; 6. Metal washer; 7. Rubber washer; 8. Slit sleeve; 9. Through hole; 10. Fastening pin; 11. Pin slot; 12. Small cone head; 13. Wrench; 14. Digital torque wrench. Detailed Implementation

[0042] To provide a clearer understanding of the present invention, a detailed description is provided below in conjunction with the accompanying drawings and embodiments. It should be noted that the given embodiments are merely one implementation method and do not represent all embodiments. Where there is no conflict, the embodiments and features within the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative effort are all within the scope of protection of the present invention.

[0043] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0044] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] This application discloses a single-sided bolted hollow bolted spherical space frame connection node, such as... Figure 1 As shown, it includes a hollow bolt ball 1, which is connected to the end of an adjacent rod 2 via a connecting mechanism.

[0046] The hollow bolt ball 1 has a through hole. One end of the connecting mechanism passes through the through hole and is located inside the hollow bolt ball 1. The other end of the connecting mechanism is fixedly connected to the rod 2, thereby realizing the fixed connection between the hollow bolt ball 1 and the rod 2. In this embodiment, the through hole on the hollow bolt ball is a smooth circular hole. The number of through holes is adjusted according to the number of rods in the actual project.

[0047] like Figures 2 to 4 As shown, the connecting mechanism includes a high-strength bolt 4, a sleeve 5, a metal washer 6, a rubber washer 7, and a slotted sleeve 8. The high-strength bolt 4 passes sequentially through the interior of the rod 2, the sleeve 5, the metal washer 6, the rubber washer 7, and the slotted sleeve 8. One end of the high-strength bolt 4 is connected to the rod 2, and the threaded end of the high-strength bolt 4 passes through the through hole on the hollow bolt ball 1 and extends into the interior of the hollow spiral ball. A small cone 12 is connected to the end of the high-strength bolt 4 located inside the hollow spiral ball.

[0048] The high-strength bolt 4 and the sleeve 5 are connected by a fastening pin 10. The sleeve 5 is fitted over the outside of the high-strength bolt 4 and has a pin hole. Correspondingly, the outer surface of the high-strength bolt 4 has a pin groove 11, which is elongated and axially aligned with the bolt. The fastening pin 10 passes sequentially through the pin hole in the sleeve 5 and the pin groove 11 on the high-strength bolt 4, thus achieving a radial fixed connection between the sleeve 5 and the high-strength bolt 4. Simultaneously, the fastening pin 10 can slide within the pin groove 11, and when the sleeve 5 is tightened, the high-strength bolt 4 rotates with the sleeve 5.

[0049] A metal washer 6 and a rubber washer 7 are sequentially arranged between the sleeve 5 and the hollow bolt ball 1. Both the metal washer 6 and the rubber washer 7 are fitted onto the outer annular surface of the high-strength bolt 4. The metal washer 6 contacts the outer surface of the hollow bolt ball 1, mainly to increase the contact area between the high-strength bolt and the hollow bolt ball, thereby enhancing the tightening effect. In this embodiment, the diameter of the metal washer 6 is larger than the diameter of the sleeve 5, which can prevent the sleeve from being unable to be tightened due to the influence of the wrench used to fix the metal washer during installation.

[0050] The slotted sleeve 8 is installed on the outside of the high-strength bolt 4. One end of the slotted sleeve 8 has several long slots with openings along its circumference, and the long slots are arranged along the axial direction of the high-strength bolt. The end of the slotted sleeve 8 with the long slots is located inside the hollow bolt ball, and the other end of the slotted sleeve 8 is fixed in the through hole of the hollow bolt ball 1.

[0051] In this embodiment, the thickness of the slotted sleeve 8 is determined based on the diameter of the high-strength bolt 4 in the actual project. Generally, the larger the diameter of the high-strength bolt, the thicker the corresponding slotted sleeve 8. The number of slots in the slotted sleeve 8 is determined based on its thickness. The greater the thickness, the more slots are required to facilitate the opening of the slotted sleeve. The specific number depends on the actual project conditions.

[0052] A rubber washer 7 is provided between the end of the slotted sleeve 8 and the metal washer 6. The metal washer 6, the rubber washer 7, and the slotted sleeve 8 are in a tight fit, ideally with the rubber washer 7 under compression. The friction between the metal washer 6 and the rubber washer 7, and between the rubber washer 7 and the slotted sleeve 8, keeps the three components relatively stationary. This ensures that the slotted sleeve does not rotate with the high-strength bolt 4 during bolt rotation.

[0053] The high-strength bolt 4 has a small conical head 12 connected to its end inside the hollow bolt ball. The small conical head 12 and the threaded end of the high-strength bolt 4 are threadedly engaged, meaning the inner surface of the small conical head 12 has internal threads, and the threaded end of the high-strength bolt 4 has external threads. The end of the small conical head 12 facing the through hole of the hollow bolt ball is tapered, and the dimension of the end facing the through hole is smaller than the dimension of the end facing away from the through hole, and the dimension of the end of the small conical head facing the through hole is smaller than the diameter of the through hole of the hollow bolt ball. At the same time, the diameter of the through hole is smaller than the diameter of the metal washer. Therefore, the specific diameter of the through hole is determined according to the diameter of the small conical head and the metal washer used in the actual project.

[0054] In the initial state, the end of the small cone 12 is inserted into the slit end of the slit sleeve 8. At this time, the slit end of the slit sleeve 8 constrains the small cone 12, preventing it from rotating and allowing it to move axially along the axis of the high-strength screw. In other words, in the initial state, the small cone 12, the slit sleeve 8, the rubber washer 6, and the metal washer 6 are in a state of tight contact.

[0055] In use, the connection node described in this application allows the high-strength bolt 4 to pass sequentially through the rod 2, sleeve 5, metal washer 6, rubber washer 7, slotted sleeve 8, and small cone 12; the sleeve 5 and metal washer 5 are located between the rod 2 and the hollow bolt ball 1; one end of the slotted sleeve 8 is set in the through hole of the hollow bolt ball, and its slotted end is set in the hollow bolt ball; the rubber washer 7 is set in the through hole and is squeezed between the slotted sleeve 8 and the metal washer 5; the small cone 12 is located in the hollow bolt ball 1, and its smaller end is pressed against the inside of the slotted end of the slotted sleeve 8.

[0056] Fix the metal washer 6. At this time, the friction between the rubber washer 7 and the slotted sleeve 8 keeps the metal washer 6, rubber washer 7, slotted sleeve 8, and small cone 12 in a relatively fixed state. At the same time, tighten the sleeve 5. Under the action of the fastening pin 10, the high-strength bolt 4 rotates with the sleeve 5.

[0057] As the high-strength bolt 4 rotates, the small cone head 12 is constrained by the slotted sleeve 8, preventing it from rotating with the bolt 4. At this time, the gear meshing between the high-strength bolt 4 and the small cone head 12 causes the small cone head 12 to move towards the through-hole of the hollow bolt ball. Simultaneously, the axial movement of the small cone head 12 expands the slotted end of the slotted sleeve 8. After the slotted sleeve 8 is expanded to a certain extent, it cannot open further. At this point, under the pressure of the small cone head, a fixed connection is formed between the slotted sleeve 8 and the through-hole. Simultaneously, the small cone head approaches the through-hole of the hollow bolt ball, and the small cone head 12 is also clamped and fixed inside the slotted sleeve 8, thus fixing and compressing the slotted sleeve 8, the small cone head 12, and the through-hole into a single unit, achieving an anchoring connection between the connecting mechanism and the hollow bolt ball.

[0058] At this point, if there is still a certain gap between the hollow bolt ball 1 and the rod 2, continue rotating the sleeve 5. As the sleeve 4 rotates, the high-strength bolt 4 will also rotate axially towards the hollow bolt ball. The high-strength bolt 4 will then drive the rod 2 towards the hollow bolt ball 1, gradually reducing the distance between the hollow bolt ball 1 and the rod 2. When the distance decreases to the point where the sleeve 5 can no longer rotate, it indicates that a fixed connection has been achieved between the rod 1 and the hollow bolt ball 2, and they are now connected as a single unit.

[0059] This application also discloses a method for achieving space frame connection using the above-mentioned hollow bolt ball space frame connection node, the method comprising the following steps.

[0060] The first step is to drill through holes in the hollow bolt ball according to construction needs. The diameter of the through hole is 0.5~1 mm larger than the diameter of the slotted sleeve.

[0061] The second step involves the threaded end of the high-strength bolt passing sequentially through the rod, sleeve, metal washer, elastic washer, slotted sleeve, and small cone, and then through the through hole of the hollow bolt ball and into the hollow bolt ball.

[0062] The third step is to connect the sleeve and the high-strength bolt by tightening the fastening pins. The fastening pins pass through the pin holes on the sleeve and the pin slots on the high-strength bolt in sequence, allowing the high-strength bolt to rotate with the sleeve.

[0063] Fourth step, clamp the wrench 13 on the outside of the metal washer 6. Use the wrench 13 to prevent the metal washer 6 from rotating with the high-strength bolt. At this time, through the friction between the metal washer and the rubber washer, as well as the friction between the slotted sleeve and the rubber washer, the slotted sleeve is locked and does not rotate with the high-strength bolt.

[0064] Then, the digital torque wrench 14 is clamped onto the outside of the sleeve 5. The sleeve 5 is rotated using the digital torque wrench 14, which in turn causes the high-strength bolt 4 to rotate. At this time, the small cone 12, which is located at the threaded end of the high-strength bolt, does not rotate with the high-strength bolt 4 under the constraint of the slotted sleeve 8. However, through the gear meshing between the high-strength bolt 4 and the small cone 12, the small cone 12 moves towards the through hole of the hollow bolt ball.

[0065] When the small cone 12 moves to contact the slotted sleeve 8, it gradually expands the slotted end of the slotted sleeve. The small cone 12 continues to move axially. When the slotted end of the slotted sleeve 8 is fully expanded, the slotted sleeve 8 can no longer expand. The slotted sleeve 8 and the through hole are fixedly connected under the pressure of the small cone 12. At the same time, the small cone 12 is clamped and fixed inside the slotted sleeve 8, realizing the fixed connection between the slotted sleeve, the through hole of the hollow bolt ball, and the small cone 12, thereby realizing the fixed connection between the connecting mechanism and the hollow bolt ball.

[0066] When there is still a gap between the hollow bolt ball 1 and the rod 2, the sleeve 5 can continue to rotate. The sleeve 5 continues to drive the high-strength bolt 4 to rotate. At this time, while rotating, the high-strength bolt 4 moves axially towards the hollow bolt ball, thereby driving the rod 2 to move towards the hollow bolt ball 1. This gradually reduces the gap between the hollow bolt ball 1 and the rod 2. When the sleeve 5 can no longer rotate, it means that the sleeve 5 is now fastened between the hollow bolt ball 1 and the rod 2, thus achieving a fixed connection between the rod 2 and the hollow bolt ball 1.

[0067] The space frame includes many connection nodes as proposed in this application. Adjacent connection nodes are connected by rods. By implementing the above steps to achieve the fixed connection between the ends of each rod and the connection node, the installation of the space frame can be completed.

[0068] The foregoing has provided a detailed description of the single-sided bolted hollow bolted ball space frame connection node and space frame connection method provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention. The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A single-sided bolted hollow bolted ball grid connection node, characterized in that, It includes a hollow bolt ball, which has a through hole, and the through hole is connected to the end of an adjacent rod through a connecting mechanism; The connecting mechanism includes a high-strength bolt, one end of which passes through a sleeve, a metal washer, a rubber washer, a slotted sleeve, and a small cone in sequence; The sleeve and metal washer are placed between the rod and the hollow bolt ball, and the sleeve drives the high-strength bolt to rotate. The small cone is located at one end of the high-strength bolt inside the hollow bolt ball, and the small cone and the high-strength bolt are threaded together. One end of the slotted sleeve is set inside the through hole of the hollow bolt ball, and its slotted end is located at the end facing the small cone. In the initial state, the metal washer, rubber washer, and slotted sleeve are in a tight fit, and there is no relative rotation between the three. One end of the small cone is inserted into the open end of the slotted sleeve. Under the constraint of the slotted sleeve, the small cone can only move along the axial direction of the high-strength bolt and cannot rotate with the high-strength bolt. The sleeve is located on the outer side of the high-strength bolt. The sleeve has a pin hole, and the corresponding high-strength bolt has a pin groove extending along the axis. The pin passes through the pin hole and the pin groove in sequence, and the pin is slidably set in the pin groove. First, the connecting mechanism and the hollow bolt ball are fixedly connected. Then, the rod is driven to move towards the hollow bolt ball, so that the distance between the rod and the hollow bolt ball gradually decreases.

2. The single-sided bolt hollow bolt ball grid connection node according to claim 1, characterized in that, The rubber washer is placed inside the through hole of the hollow bolt ball; The slotted sleeve has several long slots extending axially on the side facing the small cone, and these long slots are spaced apart circumferentially along the slotted sleeve.

3. The single-sided bolt hollow bolt ball grid connection node according to claim 1, characterized in that, The dimension of the end of the small cone tip facing the hollow bolt ball through hole is smaller than the dimension of the end of the small cone tip facing away from the hollow bolt ball through hole, and the dimension of the end of the small cone tip facing the hollow bolt ball through hole is smaller than the diameter of the through hole.

4. A method for connecting a space frame using any one-sided bolt hollow bolt ball space frame connection node as claimed in claims 1-3, characterized in that, Includes the following steps: S1. Drill a through hole in the hollow bolt ball; S2. One end of the high-strength bolt is connected to the rod, and the other end of the high-strength bolt passes through the sleeve, metal washer, rubber washer, slotted sleeve and small cone in sequence, and extends into the hollow bolt ball through the through hole. The sleeve and the high-strength bolt are connected by a pin. S3. Fix the metal washer and tighten the sleeve at the same time. The sleeve drives the high-strength bolt to rotate, and the small cone head moves towards the through hole of the hollow bolt ball. The slotted end of the slotted sleeve gradually opens up. When the small cone continues to move until the slit end of the slit sleeve can no longer be opened, the squeezing action of the small cone achieves a fixed connection between the slit sleeve and the through hole of the hollow bolt ball. At the same time, the small cone is clamped and fixed inside the slit sleeve. The slit sleeve, the through hole of the hollow bolt ball, and the small cone are fixedly connected as one unit, thereby achieving a fixed connection between the connecting mechanism and the hollow bolt ball. S4. Continue to tighten the sleeve. At this time, the distance between the hollow bolt ball and the rod gradually decreases. When the sleeve can no longer rotate, the sleeve is locked between the hollow bolt ball and the rod, thereby achieving a fixed connection between the hollow bolt ball and the rod. As the sleeve continues to tighten, the high-strength bolt rotates with the sleeve, generating axial movement towards the hollow bolt ball, which in turn drives the rod to move towards the hollow bolt ball, gradually reducing the distance between the rod and the hollow bolt ball. S5. The space frame includes several connection nodes. Adjacent connection nodes are connected by rods. By taking steps S1 to S3, the ends of each rod are fixedly connected to the connection nodes, thus completing the installation of the space frame.

5. The method according to claim 4, characterized in that, In step S3, the wrench is clamped on the outside of the metal washer, and the metal washer is prevented from rotating with the high-strength bolt by the wrench. At this time, the friction between the metal washer and the rubber washer, as well as the friction between the slotted sleeve and the rubber washer, makes the slotted sleeve lock in place. Secure the digital torque wrench to the outside of the socket, and use the digital torque wrench to rotate the socket, which in turn rotates the high-strength bolt.

6. The method according to claim 4, characterized in that, In step S3, as the sleeve drives the high-strength bolt to rotate, the small cone head does not rotate with the high-strength bolt under the constraint of the slotted sleeve. The small cone head, through tooth meshing with the high-strength bolt, generates axial movement towards the through hole of the hollow bolt ball.

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