A connecting device for a building prestressed steel structure joint

Abstract

The application relates to the technical field of building construction, in particular to a connecting device for a building prestressed steel structure joint, two U-shaped clamps are arranged on the thick lead sheath of each cable in the axial direction and are spaced apart, the two ends of the opening side of each U-shaped clamp are connected with the same side end of two U-shaped clamps on another cable through a guide pipe, two nuts and two corrugated pipes, the guide pipe is rotationally arranged between the same side ends of the two U-shaped clamps on the two cables, each corrugated pipe corresponds to the guide pipe and a nut, the corrugated pipe is elastic in the axial direction, and each nut is threadedly connected with a U-shaped clamp. By arranging the corrugated pipe between the two U-shaped clamps on the two cables, the two nuts can stretch the corrugated pipe when rotating on the corresponding U-shaped clamps, and when the thick lead sheath is abraded and the spacing between the two cables is reduced, the corrugated pipe is contracted, so that the thick lead sheaths on the two cables are still in close contact.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a connecting device for a building prestressed steel structure node. BACKGROUND

[0002] In modern building engineering, prestressed steel structures have become the core technical solution in the fields of large-span venues, bridge structures, high-rise buildings, etc. due to their high material utilization rate, flexible spatial adaptability and excellent mechanical properties. As an important part of prestressed steel structures, the two-way cable system forms a spatial force network by applying prestress in two orthogonal or oblique directions, significantly improving the overall stiffness and carrying capacity of the structure. In the cooperative work of the two-way cable, the cable node connecting device, as the key hub of force flow transmission, not only needs to reliably transmit axial tension, but also needs to adapt to cable angle changes, coordinate tension distribution and maintain long-term stability. Its performance directly determines the safety and reliability of the entire prestressed steel structure system.

[0003] The connecting device for the building prestressed steel structure node in the prior art usually includes fastening components, clamping parts, positioning plates and buffer pads. The device realizes the relative fixation between two cable bodies through the cooperation of two groups of clamping parts and positioning plates. At the same time, the buffer pads are wrapped outside the two intersecting cable bodies to avoid direct friction between the cable bodies. However, under the influence of long-term use and environmental factors, even if the design level limits the macroscopic sliding of the cable body, under the working conditions of vibration (such as wind-induced vibration) or slight load changes, the cable body and the buffer pad, and the buffer pad and the clamping part may still produce extremely small relative motion. Since the buffer pad is usually made of soft metal material, this repeated micro-motion can easily cause wear on the surface of the buffer pad, thereby reducing the fastening degree of the clamping part and the positioning plate to the cable body, and ultimately causing instability problems in the steel structure node connection. SUMMARY

[0004] Therefore, it is necessary to provide a connecting device for a building prestressed steel structure node to solve the problem that the current connecting device is easy to gradually fail during use.

[0005] The above-mentioned purpose is achieved by the following technical solutions:

[0006] The utility model provides a connecting device for building prestressed steel structure node, two inhaul cables are equipped with thick lead sheath, and the two inhaul cables are contacted through the corresponding thick lead sheath on it, the thick lead sheath on each inhaul cable is spaced apart along its axial direction and is equipped with two U-shaped clamps, the opening direction of the two U-shaped clamps on the same inhaul cable is same, and the two ends of each U-shaped clamp on one inhaul cable correspond to one end of the two U-shaped clamps on the other inhaul cable, the corresponding end of the two U-shaped clamps is connected through a fastening mechanism, the fastening mechanism includes guide pipe, two nuts and two bellows, the guide pipe is rotatably arranged between the end of the two U-shaped clamps on the two inhaul cables on the same side of its axis, and the guide pipe is slidably connected with the U-shaped clamp, each bellow corresponds to the guide pipe and a nut, the bellow is elastic in the axial direction, and the corresponding end of each nut and the U-shaped clamp is threadedly connected, and the corresponding two ends of the two U-shaped clamps on the two inhaul cables are close to or away from each other through the cooperation with the nut.

[0007] Preferably, each bellow comprises a plurality of outer convex segments and inner concave segments, the outer convex segments and the inner concave segments are sequentially and alternately arranged along the axial direction of the bellow, and the adjacent outer convex segment and inner concave segment are fixedly connected, the inner diameter of the inner concave segment in the middle is smaller than the inner diameter of the inner concave segments on its two sides and smaller than the diameter of the end of the U-shaped clamp.

[0008] Preferably, the fastening mechanism further comprises a rotating disc, the rotating disc is located between the two inhaul cables and is in contact with the thick lead sheath on the two inhaul cables, and the rotating disc is arranged between the four guide pipes and is engaged with the four guide pipes.

[0009] Preferably, the thick lead sheath is provided with four, and every two thick lead sheaths are arranged around one inhaul cable and are arranged along the axial direction of the corresponding inhaul cable, the two thick lead sheaths on the same inhaul cable are located on the two sides of the center of the rotating disc, each thick lead sheath has a front end and a tail end in the circumferential direction of the inhaul cable, and the tail end is in contact with the front end after being arranged around the inhaul cable in one turn in the circumferential direction.

[0010] Preferably, each thick lead sheath is provided with a protrusion on the side in contact with the corresponding inhaul cable, and the protrusion is located at the front end of the thick lead sheath.

[0011] Preferably, the tail end of each thick lead sheath arranged around the inhaul cable is in contact with the front end, the front end is provided with an inclined surface, the inclined surface gradually moves away from the corresponding inhaul cable from the side close to the tail end to the side away from the tail end, the tail end is also provided with an inclined surface, and the inclined surface on the tail end is slidably connected with the inclined surface on the front end; the rotating disc rotates to drive the tail end of each thick lead sheath to move towards the front end thereof.

[0012] Preferably, the side of the rotating disc in contact with the thick lead sheath is a rough surface.

[0013] Preferably, the center of the rotating disc coincides with the intersection point of the two inhaul cables, and the middle part of the two sides of the rotating disc close to the two inhaul cables is provided with a lead sheath layer.

[0014] Preferably, an anti-torsion element is provided between the conduit and the nut to increase the resistance torque between the nut and the conduit.

[0015] Preferably, each nut has multiple grooves at the end near the corresponding U-shaped clip. The multiple grooves are arranged around the circumferential direction of the nut, and each groove penetrates the nut in the radial direction. When one end of the U-shaped clip is inserted into the nut in the axial direction of the nut, the portion of the nut located between two adjacent grooves deflects away from the axis of the nut.

[0016] The beneficial effects of this invention are as follows: By using four U-shaped clamps to hold the two cables respectively, compared to the existing method of fixing one of the thick lead sheets using positioning plates, the stress-bearing area of ​​the thick lead sheet is increased, reducing the probability of stress concentration and thus extending its service life. By installing a corrugated pipe between the two U-shaped clamps on the two cables, when the two U-shaped clamps in the same conduit no longer move relative to each other, the two nuts can move away from the conduit along its axial direction and stretch the corrugated pipe. The corrugated pipe causes the two U-shaped clamps to continue to move closer together, while also increasing the friction between the nuts and the corresponding U-shaped clamps. When the thick lead sheet wears down and the distance between the two cables decreases, the corrugated pipe contracts, ensuring that the thick lead sheets on the two cables remain in close contact. Attached Figure Description

[0017] Figure 1 A schematic diagram illustrating the usage state of a connection device for prestressed steel structure nodes in a building, provided in an embodiment of the present invention;

[0018] Figure 2 This is a partial structural schematic diagram of a connecting device for prestressed steel structure nodes in a building, provided in an embodiment of the present invention.

[0019] Figure 3 A front view of a fastening mechanism for a connecting device for prestressed steel structure nodes in a building, provided in an embodiment of the present invention;

[0020] Figure 4 for Figure 3 Sectional view along the middle AA direction;

[0021] Figure 5 A schematic diagram of the cooperation structure between the thick lead sheet and the turntable of a connecting device for prestressed steel structure nodes in buildings, provided for an embodiment of the present invention;

[0022] Figure 6 A bottom view of a thick lead sheet and a turntable for a connection device for prestressed steel structure nodes in a building, provided in an embodiment of the present invention;

[0023] Figure 7 A front view of a thick lead sheet and a turntable for a connecting device for prestressed steel structure nodes in a building, provided in an embodiment of the present invention;

[0024] Figure 8 for Figure 2 Top view;

[0025] Figure 9 for Figure 8 Sectional view along the BB direction;

[0026] Figure 10 for Figure 9 A magnified view of point C in the middle.

[0027] in:

[0028] 101. Nut; 102. U-clip; 103. Cable; 105. Thick lead sheet; 106. Conduit; 107. Corrugated pipe; 108. Turntable; 109. Protrusion; 110. Front end; 111. Tail end; 112. Lead sheet layer; 113. Anti-torsion component; 114. Groove. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0030] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] like Figures 1 to 10 As shown in the embodiment of the present invention, a connecting device for prestressed steel structure nodes is provided for fixing two intersecting and overlapping cables 103. Both cables 103 are provided with thick lead sheets 105, and the two cables 103 contact each other through their corresponding thick lead sheets 105. Two U-shaped clips 102 are spaced apart along the axial direction of the thick lead sheets 105 on each cable 103. The opening directions of the two U-shaped clips 102 on the same cable 103 are the same. The two ends of each U-shaped clip 102 on one cable 103 correspond to one end of the two U-shaped clips 102 on the other cable 103. The corresponding ends of the two U-shaped clips 102 are connected by a fastening mechanism, which includes a guide tube 106 and two nuts 1. A conduit 106 is rotatably mounted on the two cables 103 between the ends of two U-shaped clamps 102 on the same side, and 107 and 106 are corrugated and rotatably connected to each other. Each bellows 107 has a corresponding end connected to a conduit 106 and a nut 101, and the bellows 107, conduit 106, and nut 101 are coaxial. The bellows 107 is elastic in the axial direction. Each nut 101 is threaded to one end of the opening side of a U-shaped clamp 102. When the nut 101 is threaded to the corresponding U-shaped clamp 102, rotating the nut 101 through the conduit 106 causes the end of the U-shaped clamp 102 to gradually approach the conduit 106 and slide through the bellows 107 into the conduit 106. As the conduit 106 rotates, the corresponding ends of the two U-shaped clamps 102 on the two cables 103 move closer or further apart through their engagement with the nut 101.

[0033] Four U-shaped clamps 102 are used to clamp the two cables 103 respectively. Compared with the existing method of fixing one of the thick lead sheets 105 by positioning plates, this increases the stress-bearing area of ​​the thick lead sheet 105, avoids stress concentration in the thick lead sheet 105, and thus extends the service life of the thick lead sheet 105. Through the cooperation of the conduit 106 and the U-shaped clamps 102, when the nut 101 drives the corresponding ends of the two U-shaped clamps 102 on the two cables 103 to approach each other, the corresponding ends of the two U-shaped clamps 102 slide within the conduit 106. The two U-shaped clamps 102 do not slide relative to each other in the radial direction of the conduit 106, making the connection between the two cables 103 more stable. By setting a bellows 107 between the two U-shaped clamps 102 on the two cables 103, the connection between the two cables 103 is further strengthened. When the two U-shaped clamps 102 no longer move relative to each other, the two nuts 101 can move away from the conduit 106 along the axial direction of the conduit 106 and stretch the bellows 107. The bellows 107 makes the two U-shaped clamps 102 tend to continue to move closer to each other, and also increases the friction between the nuts 101 and the corresponding U-shaped clamps 102. When the thick lead sheet 105 wears and the distance between the two cables 103 decreases, the bellows 107 contracts so that the thick lead sheet 105 on the two cables 103 is still in close contact.

[0034] In this embodiment, the bellows 107 is made of a metal material capable of elastic deformation. Each bellows 107 includes multiple convex and concave sections. The convex and concave sections are alternately arranged along the axial direction of the bellows 107, and adjacent convex and concave sections are fixedly connected. The inner diameter of the concave section in the middle is smaller than the inner diameter of the concave sections on both sides and smaller than the diameter of the end of the U-shaped clamp 102. Specifically, after rotating the guide tube 106, the bellows 107 will rotate relative to the U-shaped clamp 102. Guided by the threaded groove on the U-shaped clamp 102, the end of the U-shaped clamp 102 will be screwed into the concave section of the bellows 107 and in close contact with the concave section. Friction is generated between the concave section and the U-shaped clamp 102, making it difficult for the nut 101 to rotate, thus improving the connection stability between the nut 101 and the U-shaped clamp 102.

[0035] In this embodiment, the fastening mechanism also includes a turntable 108, which is located between two cables 103 and contacts the thick lead sheet 105 on each of the two cables 103. The turntable 108 is also positioned between four guide tubes 106 and engages with each of the four guide tubes 106. By rotating the turntable 108, the four guide tubes 106 can rotate synchronously, thereby increasing the installation speed of the connection device for prestressed steel structure nodes, further ensuring that the forces on both ends of each U-shaped clamp 102 are relatively balanced, and increasing the force-bearing area of ​​the thick lead sheet 105 on the two cables 103, thus increasing the service life of the thick lead sheet 105.

[0036] In this embodiment, four thick lead sheets 105 are provided, with every two thick lead sheets 105 wound around a cable 103 and arranged along the axial direction of the corresponding cable 103. The thick lead sheets 105 are wound around the cable 103, which improves the ease of installation. The two thick lead sheets 105 on the same cable 103 are located on both sides of the center of the turntable 108. Each thick lead sheet 105 has a front end 110 and a tail end 111 in the circumferential direction of the cable 103. The tail end 111 is wound around the circumferential direction of the cable 103 and then contacts the front end 110. The thick lead sheets 105 on the same cable 103 are wound in opposite directions. When the turntable 108 rotates, it can drive all the thick lead sheets 105 in contact with it to move in one direction, so that the thick lead sheets 105 wound around the cable 103 become more and more tightly wrapped.

[0037] In this embodiment, each thick lead sheet 105 has a protrusion 109 on the surface that contacts the corresponding cable 103, and the protrusion 109 is located at the front end 110 of the thick lead sheet 105. Specifically, there are multiple protrusions 109, which are arranged on the thick lead sheet 105 along the axial and circumferential directions of the cable 103. The protrusions 109 can further increase the friction between the thick lead sheet 105 and the cable 103. When the tail end 111 of the thick lead sheet 105 is located on the cable 103, the front end 110 effectively improves the adhesion between the thick lead sheet 105 and the cable 103 through the friction between the protrusions 109 and the cable 103. Adhesive is provided in the area where the protrusions 109 are located, which can improve the bonding force between the front end 110 of the thick lead sheet 105 and the cable 103.

[0038] In this embodiment, the tail end 111 of each thick lead sheet 105 wound on the cable 103 contacts the front end 110. The front end 110 is provided with a slope, which gradually moves away from the corresponding cable 103 from the side near the tail end 111 to the side away from the tail end 111. The tail end 111 is also provided with a slope, and the slope on the tail end 111 is slidably connected to the slope on the front end 110. When the thick lead sheet 105 is wound on the cable 103, the rear end of the thick lead sheet 105 and the front end 110 are connected by their respective slopes. The inclined planes overlap in the radial direction of the cable 103; the turntable 108 rotates to drive the tail end 111 of each thick lead sheet 105 to move towards its front end 110. Under the guidance of the inclined planes, the tail end 111 of the thick lead sheet 105 increases the overlap area with the inclined plane of the front end 110. At the same time, the thickness of the overlap position of the front end 110 and the tail end 111 of the thick lead sheet 105 in the radial direction of the cable 103 increases, and the pressure it receives also increases, and the contact between the tail end 111 and the front end 110 becomes tighter.

[0039] Specifically, let one of the two thick lead sheets 105 on the same cable 103 be the first sheet and the other be the second sheet. The thick lead sheet 105 is in line contact with the turntable 108, and let this contact line be the dividing line. The front ends 110 of the first and second sheets gradually move away from the dividing line from the side that is close to each other to the side that is far apart from each other, and the turntable 108 does not contact the front ends 110 of the thick lead sheet 105. The closer the front ends 110 of the thick lead sheet 105 are to the dividing line, the better the contact effect between the front ends 110 and the tail ends 111 of the thick lead sheet 105.

[0040] In this embodiment, the surface of the turntable 108 that contacts the thick lead sheet 105 is a rough surface, and the turntable 108 has textures. During the rotation of the turntable 108, the textures can increase the friction between the turntable 108 and the thick lead sheet 105, so that the tail end 111 of the thick lead sheet 105 can move better toward the front end 110, and the contact between the thick lead sheet 105 and the cable 103 is tighter.

[0041] In this embodiment, the center of the turntable 108 coincides with the intersection of the two cables 103. A lead layer 112 is provided on the middle of the two surfaces of the turntable 108 near the two cables 103. The lead layer 112 is located at the intersection of the two cables 103, which can reduce the wear of the thick lead sheet 105 on the two cables 103 and extend the service life of the device.

[0042] In this embodiment, an anti-torsion member 113 is provided between the conduit 106 and the nut 101. The anti-torsion member 113 is used to increase the resistance torque between the nut 101 and the conduit 106. The anti-torsion member 113 is a sleeve that can extend and retract along the axial direction of the conduit 106. The sleeve is fitted on the outside of the bellows 107, and both ends of the sleeve are connected to the conduit 106 and the nut 101, respectively. When the turntable 108 drives the conduit 106 to rotate, the conduit 106 drives the nut 101 to rotate synchronously through the sleeve and the bellows 107, thus preventing damage to the bellows 107.

[0043] In this embodiment, each nut 101 has multiple grooves 114 near the end of its corresponding U-shaped clip 102. These grooves 114 are arranged circumferentially around the nut 101, and each groove 114 penetrates the nut 101 radially. When one end of the U-shaped clip 102 is inserted into the nut 101 axially, the portion of the nut 101 located between two adjacent grooves 114 deflects away from the axis of the nut 101. That is, the nut 101 and the corresponding U-shaped clip 102 are just about to make contact... At this time, the nuts 101 can be partially expanded to accommodate the end of the corresponding U-shaped clamps 102 without the need for threaded rotation. This allows the nuts 101 and U-shaped clamps 102 to be inserted and engaged, achieving rapid positioning. Furthermore, when installing the fastening mechanism in sequence, the nuts 101 do not need to be rotated, and the turntable 108 will not rotate. The nuts 101 that engage with the U-shaped clamps 102 first will not be affected by the nuts 101 installed later, ensuring that the preload of the bellows 107 on both ends of the same U-shaped clamp 102 remains as consistent as possible.

[0044] The working principle of the connection device for prestressed steel structure nodes provided in the above embodiments is as follows:

[0045] First, thick lead sheets 105 are wound around the two intersecting cables 103, with the winding directions of the two thick lead sheets 105 on the same cable 103 being opposite, and the winding directions of the two adjacent thick lead sheets 105 on different cables 103 also being opposite. Then, the four wound thick lead sheets 105 are moved towards the intersection of the two cables 103, so that the contact point of the two thick lead sheets 105 on the same cable 103 is located at the intersection of the two cables 103, and at the same time, the two front ends 110 of the two thick lead sheets 105 are brought close to the dividing line. Next, a turntable 108 is placed between the two cables 103, with the lead sheet layer 112 on the turntable 108 located at the intersection of the two cables 103. Then, one nut 101 from each fastening mechanism is installed on one end of a U-shaped clamp 102 by pressing, so that one end of one U-shaped clamp 102 is respectively equipped with a fastening mechanism, and each of the remaining fastening mechanisms is installed on a different U-shaped clamp 102.

[0046] Place a U-shaped clamp 102 with two fastening mechanisms onto a thick lead sheet 105 on a cable 103, and make the two guide tubes 106 in the two fastening mechanisms engage with the turntable 108 respectively. Then, place a U-shaped clamp 102 with one fastening mechanism onto a thick lead sheet 105 on another cable 103, and make the end of the U-shaped clamp 102 without a fastening mechanism correspond to the end of the U-shaped clamp 102 already installed on the cable 103. Then, press the U-shaped clamp 102 that was just placed on so that the end without a fastening mechanism is engaged with a nut 101 in the fastening mechanism of the other U-shaped clamp 102. Similarly, another U-shaped clamp 102 with only one fastening mechanism is installed onto the thick lead sheet 105 of a cable 103, and its end without a fastening mechanism is engaged with a nut 101 in one of the fastening mechanisms on the cable 103. Finally, the remaining two ends of the U-shaped clamp 102 are installed onto the corresponding cables 103 and engaged with the nuts 101 in the corresponding fastening mechanisms. During the installation of the U-shaped clamp 102, the angle of the U-shaped clamp 102 is adaptively fine-tuned so that the guide tube 106 on the U-shaped clamp 102 engages with the turntable 108.

[0047] Next, the turntable 108 is rotated, causing the four guide tubes 106 to rotate synchronously. Each guide tube 106, through the anti-torsion member 113 and the bellows 107 connected to it, causes the two nuts 101 at both ends to rotate. The rotation of the two nuts 101, through the threaded connection with the corresponding U-shaped clamps 102, causes the two U-shaped clamps 102 to move closer to each other. The U-shaped clamps 102 on the two cables 103 move synchronously and move closer to each other, causing the pressure between the U-shaped clamps 102 and the corresponding cables 103 to gradually increase. At the same time, the rotation of the turntable 108 causes the thick lead sheet 105 in contact with it to move accordingly. The tail end 111 of the thick lead sheet 105 moves towards its front end 110 (e.g., Figure 6 As shown, Figure 6 (The arrow indicates the direction of rotation of turntable 108). At the connection point of cable 103 in the circumferential direction, the thick lead sheet 105 is squeezed tighter and tighter by the inclined surfaces of its front end 110 and tail end 111, and the thick lead sheet 105 wraps the cable 103 tighter and tighter.

[0048] When the turntable 108 stops rotating, the nut 101 can be rotated using a tool. The nut 101 drives the turntable 108 to rotate, which in turn drives the remaining nuts 101 to rotate. During the rotation of the nut 101 relative to the U-shaped clamp 102, the nut 101 will pull the anti-torsion member 113 and the bellows 107 to extend. The extended bellows 107 and the anti-torsion member 113 will exert a pulling force on the nut 101 towards the guide tube 106. At the same time, the concave section in the middle of the bellows 107 will move towards the U-shaped clamp 102 and eventually be fitted onto the U-shaped clamp 102. At this time, the bellows 107 will exert a holding force on the end of the U-shaped clamp 102, preventing it from rotating relative to the U-shaped clamp 102.

[0049] If the thick lead sheet 105 between the two cables 103 wears down, the bellows 107 and the anti-torsion member 113 will shrink relative to each other, so that the U-shaped clamp 102 can still fix the two cables 103.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A connecting device for prestressed steel structure nodes in buildings, characterized in that, Both cables are fitted with thick lead sheets, and the two cables are in contact through corresponding thick lead sheets. Two U-shaped clips are spaced axially along the outer edge of the thick lead sheets on each cable. The opening directions of the two U-shaped clips on the same cable are the same. The two ends of each U-shaped clip on one cable correspond to one end of the two U-shaped clips on the other cable. The corresponding ends of the two U-shaped clips are connected by a fastening mechanism, which includes a guide tube, two nuts, and two bellows. The guide tube is rotatably positioned between the ends of the two U-shaped clips on the same side of the two cables, and is slidably connected to the U-shaped clips. Each bellows is connected to a nut and is elastic in the axial direction. Each nut and the corresponding end of a U-shaped clip are threaded together. The corresponding ends of the two U-shaped clips on the two cables move closer or further apart through their engagement with the nuts.

2. The connecting device for prestressed steel structure nodes according to claim 1, characterized in that, Each bellows includes multiple convex and concave sections, which are alternately arranged along the axial direction of the bellows. Adjacent convex and concave sections are fixedly connected. The inner diameter of the concave section in the middle is smaller than the inner diameter of the concave sections on both sides and smaller than the diameter of the end of the U-shaped clamp.

3. The connecting device for prestressed steel structure nodes according to claim 1, characterized in that, The fastening mechanism also includes a turntable located between two cables and in contact with the thick lead sheet on each of the two cables, and the turntable positioned between four guide tubes and engaging with each of the four guide tubes.

4. A connecting device for prestressed steel structure nodes in buildings according to claim 3, characterized in that, There are four thick lead sheets. Two thick lead sheets are wound around a cable and arranged along the axial direction of the corresponding cable. The two thick lead sheets on the same cable are located on both sides of the center of the turntable. Each thick lead sheet has a front end and a tail end in the circumferential direction of the cable. The tail end is wound around the circumferential direction of the cable and then contacts the front end.

5. A connecting device for prestressed steel structure nodes according to claim 4, characterized in that, Each thick lead sheet has a protrusion on the side that contacts the corresponding cable, and the protrusion is located at the front end of the thick lead sheet.

6. A connecting device for prestressed steel structure nodes according to claim 4, characterized in that, Each thick lead sheet wound around the cable has its tail end in contact with its front end. The front end has a ramp that gradually moves away from the corresponding cable from the side closest to the tail end to the side furthest from the tail end. The tail end also has a ramp that slides in connection with the ramp on the front end. The rotation of the turntable drives the tail end of each thick lead sheet to move closer to its front end.

7. A connecting device for prestressed steel structure nodes according to claim 3, characterized in that, The side of the turntable that contacts the thick lead sheet is rough.

8. A connecting device for prestressed steel structure nodes in buildings according to claim 3, characterized in that, The center of the turntable coincides with the intersection of the two cables, and lead sheets are provided in the middle of the two faces of the turntable closest to the two cables.

9. A connecting device for prestressed steel structure nodes according to claim 1, characterized in that, An anti-torsion element is provided between the conduit and the nut to increase the resistance torque between the nut and the conduit.

10. A connecting device for prestressed steel structure nodes according to claim 1, characterized in that, Each nut has multiple grooves near the end of the corresponding U-shaped clip. These grooves are arranged around the circumference of the nut and penetrate the nut radially. When one end of the U-shaped clip is inserted into the nut axially, the portion of the nut between two adjacent grooves deflects away from the nut's axis.

Images