Connecting device for building prestressed steel structure joints

Abstract

The invention relates to the technical field of building construction, in particular to a connecting device for building prestressed steel structure nodes, which is characterized in that two U-shaped clamps are arranged outside a thick lead sheath on each inhaul cable at an interval along the axial direction of the thick lead sheath; the two ends of the opening side of each U-shaped clamp are connected with the ends, located on the same side, of the two U-shaped clamps on the other inhaul cable through a guide pipe, two nuts and two corrugated pipes respectively, the guide pipe is rotationally arranged between the ends, located on the same side, of the two U-shaped clamps on the two inhaul cables, and each corrugated pipe is correspondingly connected with the guide pipe and one nut. The corrugated pipe is elastic in the axial direction, and each nut is in threaded connection with one U-shaped clamp. The corrugated pipe is arranged between the two U-shaped clamps on the two inhaul cables, the corrugated pipe can be stretched when the two nuts rotate on the corresponding U-shaped clamps, and when the distance between the two inhaul cables is reduced due to abrasion of the thick lead sheaths, the corrugated pipe shrinks, so that the thick lead sheaths on the two inhaul 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 bidirectional 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 bidirectional cables, 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, extremely small relative movement may still occur between the cable body and the buffer pad, and between the buffer pad and the clamping part. 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 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 prone to gradual failure during use.

[0004] The above-mentioned purpose is achieved by the following technical solutions: 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.

[0005] 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.

[0006] 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.

[0007] 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.

[0008] 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.

[0009] 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 direction close to the front end thereof.

[0010] Preferably, the side of the rotating disc in contact with the thick lead sheath is a rough surface.

[0011] 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.

[0012] Preferably, an anti-torque element is arranged between the conduit and the nut, and the anti-torque element is used to increase the resistance torque between the nut and the conduit.

[0013] Preferably, each nut is provided with a plurality of grooves near the end of the corresponding U-shaped clamp, the plurality of grooves are arranged along the circumferential direction of the nut, and each groove penetrates the nut along the radial direction of the nut, when one end of the U-shaped clamp is inserted into the nut along the axial direction of the nut, the part of the nut between the adjacent two grooves is deflected away from the axis of the nut.

[0014] The beneficial effects of the present application are: four U-shaped clamps are arranged to clamp two cables respectively, compared with the existing fixing mode of one thick lead sheet through a positioning plate, the stress area of the thick lead sheet is increased, the probability of stress concentration of the thick lead sheet is reduced, and the service life of the thick lead sheet is prolonged. By arranging the 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 the axial direction of the conduit and stretch the corrugated pipe, the corrugated pipe makes the two U-shaped clamps have a tendency to continue to approach each other, and also improves the friction between the nut and the corresponding U-shaped clamp, when the thick lead sheet is worn and the distance between the two cables is reduced, the corrugated pipe is contracted, so that the thick lead sheets on the two cables are still in close contact. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A use state schematic diagram of a connecting device for a building prestressed steel structure node is provided for the embodiment of the present application. Figure 2 A partial structure schematic diagram of a connecting device for a building prestressed steel structure node is provided for the embodiment of the present application. Figure 3 A front view of a fastening mechanism of a connecting device for a building prestressed steel structure node is provided for the embodiment of the present application. Figure 4 A Figure 3 sectional view in the direction of A-A. Figure 5 A cooperation structure schematic diagram of a thick lead sheet and a rotating disc of a connecting device for a building prestressed steel structure node is provided for the embodiment of the present application. Figure 6 A bottom view of a thick lead sheet and a rotating disc of a connecting device for a building prestressed steel structure node is provided for the embodiment of the present application. Figure 7 A front view of a thick lead sheet and a rotating disc of a connecting device for a building prestressed steel structure node is provided for the embodiment of the present application. Figure 8 A Figure 2 top view. Figure 9 A Figure 8Cross-sectional view along the direction of B-B; Figure 10 To Figure 9 Enlarged view at C.

[0016] Wherein: 101, nut; 102, U-shaped clamp; 103, cable; 105, thick lead sheet; 106, catheter; 107, corrugated tube; 108, rotary disc; 109, protrusion; 110, front end; 111, tail end; 112, lead sheet layer; 113, anti-twist member; 114, groove. DETAILED DESCRIPTION

[0017] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0018] The serial numbers of components in the present application, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. The "connection" and "coupling" in the present application include direct and indirect connection (coupling) unless otherwise specified. In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientations or positional relationships shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0019] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0020] As Figures 1 to 10As shown, the connecting device for building prestressed steel structure joint provided by the embodiment of the application is used for fixing two crossing and overlapping cables 103, the two cables 103 are provided with thick lead sheets 105, and the two cables 103 contact through the corresponding thick lead sheets 105; the thick lead sheet 105 on each cable 103 is provided with two U-shaped clamps 102 at the outer side of the axial direction, the opening directions of the two U-shaped clamps 102 on the same cable 103 are the same, and the two ends of each U-shaped clamp 102 on one cable 103 correspond to one end of the two U-shaped clamps 102 on the other cable 103, and the corresponding ends of the two U-shaped clamps 102 are connected through a fastening mechanism, the fastening mechanism comprises a guide pipe 106, two nuts 101 and two corrugated pipes 107, the guide pipe 106 is rotatably arranged between the ends of the two U-shaped clamps 102 on the two cables 103 on the same side of the axial direction, the guide pipe 106 is slidably connected with the U-shaped clamps 102, the two ends of each corrugated pipe 107 correspond to the guide pipe 106 and one nut 101, and the corrugated pipe 107, the guide pipe 106 and the nut 101 are coaxial; the corrugated pipe 107 is elastic in the axial direction, and each nut 101 is threadedly connected with one end of the opening side of the U-shaped clamp 102; when the nut 101 is threadedly connected with the corresponding U-shaped clamp 102, the end of the U-shaped clamp 102 gradually approaches the guide pipe 106 and slides into the guide pipe 106 through the corrugated pipe 107 by rotating the nut 101 through the guide pipe 106. When the guide pipe 106 rotates, the corresponding two ends of the two U-shaped clamps 102 on the two cables 103 approach or move away from each other through the cooperation with the nut 101.

[0021] The four U-shaped clamps 102 are arranged to clamp the two cables 103 respectively, compared with the prior art fixing one thick lead sheet 105 through a positioning plate, the stress area of the thick lead sheet 105 is increased, the problem of stress concentration of the thick lead sheet 105 is avoided, and the service life of the thick lead sheet 105 is prolonged. Through the cooperation of the conduit 106 and the U-shaped clamp 102, when the corresponding ends of the two U-shaped clamps 102 on the two cables 103 are driven to move close to each other by the screw nut 101, the corresponding ends of the two U-shaped clamps 102 slide in the conduit 106, the two U-shaped clamps 102 cannot slide relatively in the radial direction of the conduit 106, and the connection between the two cables 103 is more stable; the corrugated pipe 107 is arranged between the two U-shaped clamps 102 on the two cables 103, when the two U-shaped clamps 102 in the same conduit 106 no longer move relatively, the two screw nuts 101 can move away from the conduit 106 in the axial direction of the conduit 106 and stretch the corrugated pipe 107, the corrugated pipe 107 makes the two U-shaped clamps 102 have a tendency to move close to each other, and also improves the friction between the screw nut 101 and the corresponding U-shaped clamp 102, when the thick lead sheet 105 is worn and the distance between the two cables 103 is reduced, the corrugated pipe 107 is contracted, and the thick lead sheet 105 on the two cables 103 is still in close contact.

[0022] In the embodiment, the corrugated pipe 107 is made of a metal material capable of elastic deformation, each corrugated pipe 107 includes a plurality of outer convex segments and inner concave segments, the outer convex segments and the inner concave segments are arranged alternately in the axial direction of the corrugated pipe 107, and adjacent outer convex segments and inner concave segments are fixedly connected, the inner diameter of the inner concave segment located in the middle is smaller than the inner diameters of the inner concave segments on both sides and smaller than the diameter of the end of the U-shaped clamp 102. Specifically, after rotating the conduit 106, the corrugated pipe 107 will rotate relative to the U-shaped clamp 102, through the guidance of the threaded groove on the U-shaped clamp 102, the end of the U-shaped clamp 102 will be screwed into the inner concave segment of the corrugated pipe 107 and tightly contact with the inner concave segment, a friction force is generated between the inner concave segment and the U-shaped clamp 102, so that the screw nut 101 is not easy to rotate, and the connection stability of the screw nut 101 and the U-shaped clamp 102 is improved.

[0023] In the embodiment, the fastening mechanism further includes a rotating disc 108, the rotating disc 108 is located between the two cables 103 and contacts with the thick lead sheets 105 on the two cables 103 respectively, the rotating disc 108 is arranged between the four conduits 106 and engages with the four conduits 106 respectively, by rotating the rotating disc 108, the four conduits 106 can be rotated synchronously, the installation speed of the connecting device for building prestressed steel structure joints is improved, the stress of the two ends of each U-shaped clamp 102 is more balanced, the stress area of the thick lead sheets 105 on the two cables 103 is increased, and the service life of the thick lead sheets 105 is increased.

[0024] In the embodiment, four thick lead skins 105 are provided, and two thick lead skins 105 are arranged on one cable 103 in the axial direction of the corresponding cable 103. The thick lead skin 105 is arranged on the cable 103, which improves the convenience of installation of the thick lead skin 105. The two thick lead skins 105 on the same cable 103 are located on both sides of the center of the rotating disc 108. Each thick lead skin 105 has a front end 110 and a tail end 111 in the circumferential direction of the cable 103. The tail end 111 is arranged in one circle around the circumferential direction of the cable 103 and is in contact with the front end 110. The thick lead skins 105 on the same cable 103 are arranged in opposite directions. When the rotating disc 108 rotates, it can drive all the thick lead skins 105 in contact with it to move in one direction, so that the thick lead skins 105 arranged on the cable 103 are more and more compact.

[0025] In the embodiment, the thick lead skin 105 is provided with a protrusion 109 on the side in contact with the corresponding cable 103, and the protrusion 109 is located at the front end 110 of the thick lead skin 105. Specifically, the protrusion 109 is provided with a plurality of protrusions 109 arranged on the thick lead skin 105 in the axial direction and the circumferential direction of the cable 103. The protrusion 109 can further improve the friction between the thick lead skin 105 and the cable 103. When the tail end 111 of the thick lead skin 105 is located on the cable 103, the front end 110 can effectively improve the adhesion between the thick lead skin 105 and the cable 103 through the friction between the protrusion 109 and the cable 103. The area where the protrusion 109 is located is provided with glue, which can improve the bonding force between the front end 110 of the thick lead skin 105 and the cable 103.

[0026] In the embodiment, the tail end 111 of each thick lead skin 105 arranged on the cable 103 is in contact with the front end 110. The front end 110 is provided with an inclined surface, which gradually moves away from the corresponding cable 103 from the side close to the tail end 111 to the side away from the tail end 111. The tail end 111 is also provided with an inclined surface, and the inclined surface on the tail end 111 is in sliding connection with the inclined surface on the front end 110. When the thick lead skin 105 is arranged on the cable 103, the rear end of the thick lead skin 105 and the front end 110 overlap in the radial direction of the cable 103 through their respective inclined surfaces. When the rotating disc 108 rotates to drive the tail end 111 of each thick lead skin 105 to move towards the front end 110, the tail end 111 of the thick lead skin 105 will increase the overlapping area with the inclined surface of the front end 110 under the guidance of the inclined surface. At the same time, the overlapping position of the front end 110 and the tail end 111 of the thick lead skin 105 increases in the radial direction of the cable 103, and the pressure it receives also increases, and the contact between the tail end 111 and the front end 110 is more closely.

[0027] Specifically, one of the two thick lead skins 105 on the same cable 103 is a first skin and the other is a second skin, the thick lead skin 105 is in linear contact with the rotating disc 108, the contact line is a boundary line, the front ends 110 of the first skin and the second skin gradually move away from the boundary line from the side where the front ends 110 are close to each other to the side where the front ends 110 are far away from each other, and the rotating disc 108 does not contact the front ends 110 of the thick lead skin 105. The closer the front end 110 of the thick lead skin 105 is to the boundary line, the better the contact effect between the front end 110 and the tail end 111 of the thick lead skin 105.

[0028] In the embodiment, the surface of the rotating disc 108 in contact with the thick lead skin 105 is a rough surface, and the rotating disc 108 is provided with a pattern, which can increase the friction between the rotating disc 108 and the thick lead skin 105 during the rotation of the rotating disc 108, so that the tail end 111 of the thick lead skin 105 moves better in the direction close to the front end 110, and the contact between the thick lead skin 105 and the cable 103 is more closely.

[0029] In the embodiment, the center of the rotating disc 108 coincides with the intersection of the two cables 103, and the middle part of each of the two surfaces of the rotating disc 108 close to the two cables 103 is provided with a lead skin layer 112, which is located at the intersection of the two cables 103, so as to reduce the wear of the thick lead skin 105 on the two cables 103 and prolong the service life of the device.

[0030] In the embodiment, an anti-torsion member 113 is arranged between the conduit 106 and the nut 101, which is used to increase the resistance torque between the nut 101 and the conduit 106. The anti-torsion member 113 is a sleeve which can stretch and contract in the axial direction of the conduit 106, the sleeve is sleeved outside the corrugated pipe 107, and the two ends of the sleeve are connected with the conduit 106 and the nut 101 respectively. When the rotating disc 108 drives the conduit 106 to rotate, the conduit 106 drives the nut 101 to rotate synchronously through the sleeve and the corrugated pipe 107, so as to avoid the damage of the corrugated pipe 107.

[0031] In the embodiment, each nut 101 is provided with a plurality of grooves 114 near the end of the corresponding U-shaped clamp 102, the plurality of grooves 114 are arranged in the circumferential direction of the nut 101, and each groove 114 penetrates the nut 101 in the radial direction of the nut 101. When one end of the U-shaped clamp 102 is inserted into the nut 101 in the axial direction of the nut 101, the part of the nut 101 between the two adjacent grooves 114 is deflected away from the axis of the nut 101, that is, the nut 101 and the corresponding U-shaped clamp 102 can not be connected by rotating the thread, but by expanding the local part of the nut 101 to accommodate the end of the corresponding U-shaped clamp 102, so that the nut 101 and the U-shaped clamp 102 can be connected by inserting and positioning, and the nut 101 does not need to be rotated when the fastening mechanism is installed in sequence, and the rotating disc 108 also does not rotate. The nut 101 connected with the U-shaped clamp 102 first will not be affected by the nut 101 installed later, so that the pre-tightening force of the bellows 107 on the two ends of the same U-shaped clamp 102 can be kept as consistent as possible.

[0032] The working principle of the connecting device for building prestressed steel structure nodes provided in the above embodiment is: First, wrap the thick lead sheet 105 on the two intersecting cables 103, and make the wrapping directions of the two thick lead sheets 105 on the same cable 103 opposite, and the wrapping directions of the two adjacent thick lead sheets 105 on different cables 103 also opposite. Then move the four wrapped thick lead sheets 105 to the intersection of the two cables 103, so that the contact positions of the two thick lead sheets 105 on the same cable 103 are located at the intersection of the two cables 103, and the two front ends 110 of the two thick lead sheets 105 approach each other on both sides of the boundary line. Then place the rotating disc 108 between the two cables 103 and make the lead sheet layer 112 on the rotating disc 108 located at the intersection of the two cables 103, then install one nut 101 in each fastening mechanism on one end of one U-shaped clamp 102 by pressing, and make two ends of one U-shaped clamp 102 respectively installed with one fastening mechanism, and the remaining each fastening mechanism is installed on different U-shaped clamps 102.

[0033] The U-shaped clip 102 with two fastening mechanisms is placed on a thick lead sheet 105 on a cable 103, and the two conduits 106 in the two fastening mechanisms are engaged with the rotating disc 108 respectively, then the U-shaped clip 102 with one fastening mechanism is placed on a thick lead sheet 105 on another cable 103, and the end of the U-shaped clip 102 without the fastening mechanism corresponds to the end of the U-shaped clip 102 already installed on the cable 103, then the end of the just-placed U-shaped clip 102 without the fastening mechanism is clamped with the nut 101 in one of the fastening mechanisms on the other U-shaped clip 102 by pressing the just-placed U-shaped clip 102. Similarly, the U-shaped clip 102 with one fastening mechanism is installed on a thick lead sheet 105 on a cable 103, and the end of the U-shaped clip 102 without the fastening mechanism is clamped with the nut 101 in one of the fastening mechanisms on the cable 103, and finally the two ends of the remaining U-shaped clip 102 are installed on the corresponding cables 103 and clamped with the nuts 101 in the corresponding fastening mechanisms. During the installation of the U-shaped clip 102, the angle of the U-shaped clip 102 is adjusted adaptively so that the conduits 106 on the U-shaped clip 102 are engaged with the rotating disc 108.

[0034] Then the rotating disc 108 is rotated, and the rotating disc 108 drives the four conduits 106 to rotate synchronously, each conduit 106 drives the two nuts 101 at its two ends to rotate through the torsion-resistant member 113 and the bellows 107 connected thereto, and the two nuts 101 rotate to drive the two U-shaped clips 102 to approach each other through the threaded connection with the corresponding U-shaped clip 102. The U-shaped clips 102 on the two cables 103 move synchronously and approach each other, so that the pressure between the U-shaped clips 102 and the corresponding cables 103 gradually increases, and at the same time, the rotation of the rotating disc 108 drives the thick lead sheet 105 in contact with it to move, the tail end 111 of the thick lead sheet 105 moves towards the front end 110 (as shown by the arrow in Figure 6 Figure 6 The direction of the arrow is the direction of rotation of the rotating disc 108), and the connection position of the thick lead sheet 105 on the cable 103 in the circumferential direction is squeezed more and more tightly by the action of the inclined surfaces of the front end 110 and the tail end 111, and the thick lead sheet 105 is wrapped more and more tightly around the cable 103.

[0035] ​When the rotating disc 108 is not rotating, the nut 101 can be rotated by using a tool, and the nut 101 drives the rotating disc 108 to rotate, and then drives the remaining nuts 101 to rotate. In the process of rotating the nut 101 relative to the U-shaped clamp 102, the nut 101 pulls the torsion member 113 and the bellows 107 to stretch, and the stretched bellows 107 and the torsion member 113 generate a pulling force to the nut 101 to close to the guide pipe 106, and the inner concave section in the middle of the bellows 107 closes to the U-shaped clamp 102, and finally is sleeved on the U-shaped clamp 102, at this time, the bellows 107 generates a holding force to the end of the U-shaped clamp 102 to prevent the relative rotation with the U-shaped clamp 102.

[0036] If the thick lead sheet 105 between the two cables 103 is worn, the bellows 107 and the torsion member 113 will relatively contract, so that the U-shaped clamp 102 can still fix the two cables 103.

[0037] The technical features of the above embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0038] The above embodiments only express several embodiments of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of variations and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to 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 in buildings 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 in buildings 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.

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