Connecting node system of prestressed fiber composite cable capable of cooperatively releasing shearing force and torque

Abstract

The connecting joint system of the shearing force-torque synergistic release prestressed fiber composite cable comprises an upper outer sleeve, a lower outer sleeve, an upper inner sleeve, a lower inner sleeve, a sling, a support, a tightening nail, an elastic strip, a sliding block, a sliding lifting lug and a fixing nail. Semicircular side grooves are formed in the semicircular surfaces of the inner sides of the two upper end ribs and the two lower end ribs of the upper inner sleeve and the lower inner sleeve, fixing nails are fixed to the two ends in the side grooves respectively, two elastic strips are installed in the side grooves, one ends of the elastic strips are fixed to the fixing nails at the two ends respectively, and the other ends of the elastic strips are fixed to the fixing nails at the two ends respectively. The other ends of the two elastic strips are sleeved on the tightening nails, the tightening nails respectively penetrate through the center holes and the side grooves and are fixed at two ends of the corresponding upper outer sleeve and two ends of the corresponding lower outer sleeve, and the center holes are respectively positioned in the centers of the semicircular ring surfaces on the outer sides of the two upper end ribs and the two lower end ribs and are communicated with the corresponding side grooves; a sliding groove is formed in the support, the sliding block moves in the sliding groove, a sliding lifting lug is fixed to the upper end of the sliding block, and the other end of the sling is installed on the sliding lifting lug.

Description

Technical Field

[0001] The present invention relates to the technical field of cable structures, and in particular to a connection node system of prestressed fiber composite cables with coordinated shear-torque release. Background Art

[0002] Cable structures offer advantages such as low carbon and material savings, strong spanning capacity, and a lightweight and aesthetically pleasing structure. They are widely used in suspension bridges and long-span spatial structures. The main cable, slings, and stiffening beams are key load-bearing components of the cable system. The main cable primarily bears tension, while the slings connect the main cable and stiffening beams to transfer load. The reliability of the connection nodes between the slings, main cables, and stiffening beams is key to ensuring stable load-bearing in the cable system.

[0003] Pin-jointed nodes are a common form of connection between slings, main cables, and stiffening beams. This node is characterized by releasing some of the node's translational and rotational degrees of freedom, allowing the connected main cables and stays to be primarily subjected to tension under the vertical static loads transmitted from the stiffening beams. However, during earthquakes or strong winds, the structure may experience out-of-plane deformation, i.e., lateral vibration or torsion. This can cause significant changes in the stress behavior of key components such as the main cables, slings, and cable clamps. The main cables may experience lateral bending or torsional shear stress in their cross-sections, which may accelerate steel wire fatigue or local damage. The slings may tilt, increasing the difference in cable tension at different locations and accelerating fatigue failure. The cable clamps may be subjected to shear forces and additional bending moments in non-design directions, resulting in loss of bolt preload and insufficient friction between the contact surface between the cable clamp and the main cable to resist lateral loads, leading to slippage. The above reasons lead to the risk of cable structure failure during earthquakes or strong winds, especially for fiber composite cable structures, where the risk of structural failure is even greater due to the relatively poor shear and torsional properties of the material.

[0004] Currently, no effective solution has been proposed to address the shortcomings and deficiencies of related technologies, such as the fact that cable structure connection nodes are prone to significant changes in the stress behavior of key components under out-of-plane deformation conditions, thereby reducing structural reliability.

[0005] Chinese patent CN200620098950.3 discloses a "rotatable suspension bridge cable clamp," which addresses the problem of existing cable clamps being unable to rotate during the construction process of a suspension bridge main cable from an unused cable state to a completed bridge, making it difficult to align the cable. Although it includes an upper inner sleeve and a lower inner sleeve, its circumferential structure, function, and effect differ from those of the present application. More importantly, the freely rotatable cable clamp system in the aforementioned patent has limited energy dissipation capacity and lacks resilience during the service life of the structure, potentially resulting in insufficient structural resilience when subjected to extreme loads. Summary of the Invention

[0006] In view of this, the purpose of the invention of this application is to provide a prestressed cable structure connection node system with coordinated shear-torque release, which can allow the node components to rotate or slip locally when the cable system undergoes out-of-plane deformation, avoiding excessive accumulation of torque and shear force, thereby reducing additional stress, and effectively solving the problem of significant changes in the stress state of the main load-bearing components caused by out-of-plane deformation of the cable system structure under earthquakes or strong winds.

[0007] In order to achieve the invention purpose of this application, this application adopts the following technical solutions:

[0008] The present invention provides a connection node system for a prestressed fiber composite cable with coordinated release of shear and torque, which comprises: an upper outer sleeve, a lower outer sleeve, an upper inner sleeve, a lower inner sleeve, a sling and a support, wherein the upper outer sleeve comprises: an upper outer sleeve and an upper side rib, the upper outer sleeve is a semicircular cylinder, and the two upper side ribs are respectively fixed on both sides of the upper outer sleeve; the lower outer sleeve comprises: a lower outer sleeve, a lower side rib and a lifting lug, the lower outer sleeve is a semicircular cylinder, and the two lower side ribs are respectively fixed on both sides of the lower outer sleeve; the cross-sections of the upper outer sleeve and the lower outer sleeve form a circle, and along the length direction of the lower outer sleeve, the lifting lug is fixed to the lower end of the lower outer sleeve, and the lifting lug is fixed on the lifting lug. There is a lifting ear hole, the upper ribs and the lower ribs are aligned up and down, and the upper outer sleeve and the lower outer sleeve are fixed together in the length direction by a number of screws and nuts; the upper inner sleeve includes: an upper inner sleeve and an upper end rib, the upper inner sleeve is a semicircular cylinder, the two upper end ribs are respectively fixed to the front and rear ends of the upper inner sleeve, the upper inner sleeve is mounted on the inner side of the upper outer sleeve, and the two upper end ribs are respectively located at the front and rear ends of the upper outer sleeve; the lower inner sleeve includes: a lower inner sleeve and a lower end rib, the lower inner sleeve is a semicircular cylinder, the two lower end ribs are respectively fixed to the front and rear ends of the lower inner sleeve, the lower inner sleeve is mounted on the inner side of the lower outer sleeve, and the two lower end ribs They are respectively located at the front and rear ends of the lower outer sleeve, the two upper end ribs and the lower end ribs are aligned up and down, and the upper inner sleeve and the lower inner sleeve are fixed together by screws and nuts. The main cable is clamped between the upper outer sleeve, the upper inner sleeve and the lower outer sleeve, and the lower inner sleeve. One end of the sling is fixed to the ear hole through a fastener, and the other end is fixed to the support through a fastener. The support is fixed to the stiffening beam through the fastener, wherein: it also includes: tightening nails, elastic strips, sliders, sliding ears and fixing nails. Semicircular side grooves are respectively opened on the inner semicircular surfaces of the two upper end ribs and the two lower end ribs of the upper inner sleeve and the lower inner sleeve. The two ends of the above-mentioned side groove are respectively fixed with fixing nails, and two elastic strips are installed in the above-mentioned side grooves, one end of the above-mentioned elastic strips is respectively fixed on the fixing nails at both ends, and the other ends of the two elastic strips are both sleeved on the tightening nails, and the tightening nails pass through the center hole and the side groove and are fixed to the two ends of their corresponding upper outer sleeve and the two ends of the lower outer sleeve. The center holes are respectively located in the center of the semicircular surface outside the two upper end ribs and the two lower end ribs, and are communicated with the corresponding side grooves; a slide groove is opened on the support, and the slider moves in the slide groove. A sliding ear is fixed to the upper end of the slider, and the other end of the sling is mounted on the sliding ear.

[0009] The connection node system of the prestressed fiber composite cable with coordinated shear-torque release of the present invention comprises: a limit block is respectively installed at both ends of the slide groove to limit the stroke of the slider.

[0010] The connection node system of the prestressed fiber composite cable with coordinated shear-torque release of the present invention comprises buffers installed at both ends of the slider, so that the buffers first contact the limit blocks.

[0011] The connection node system of the prestressed fiber composite cable with coordinated shear-torque release of the present invention, wherein: the buffer member is a spring, an energy dissipator or a damper.

[0012] The connection node system of the prestressed fiber composite cable with coordinated shear-torque release of the present invention, wherein: in the length direction of the contact point between the upper inner sleeve and the lower inner sleeve, the upper inner sleeve and the lower inner sleeve are respectively provided with a rectangular boss and a rectangular groove, so that the side surfaces of the upper inner sleeve and the lower inner sleeve are tightly meshed together.

[0013] The connection node system of the prestressed fiber composite cable with coordinated shear-torque release of the present invention can achieve the following beneficial effects:

[0014] 1) For the main cable and the cable clamp, this connection method can transmit the cable tension and release the torque through the adaptive rotation of the cable clamp, avoid the formation of torsional shear stress on the main cable cross section, reduce the additional bending stress on the cable clamp, and prevent the loss of preload or slippage of the cable clamp bolt due to torque;

[0015] 2) For the sling, this connection method can avoid the adverse effects of additional bending moment and torque on the sling through the adaptive rotation of the cable clamp. At the same time, through the displacement of the unidirectional sliding support, the cable force change when the upper and lower nodes are relatively displaced is avoided, and the cable force is adaptively adjusted, as shown in Figure 9(b);

[0016] 3) Compared with the authorized patent "Rotatable Suspension Bridge Cable Clamp" (CN200620098950.3), although the above patent also realizes construction control through a rotatable cable clamp, it is significantly different from the present invention. First, it realizes the coordinated release of torque and shear force during service to ensure service safety; second, the structure of the present invention has self-resetting ability.

[0017] Through the present invention, it is achieved that the additional torque and bending stress of the main cable, cable clamp and sling are actively released through structural measures, the adverse effects of out-of-plane deformation are effectively reduced, and the adaptability of the cable system to earthquake and wind loads is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1Schematic diagram of a three-dimensional connection node system of a prestressed fiber composite cable with coordinated shear-torque release according to the present invention;

[0019] Figure 2 An exploded perspective schematic diagram of the connection node system of the prestressed fiber composite cable with coordinated shear-torque release according to the present invention after the bolts, nuts and fasteners are removed;

[0020] Figure 3 It is a three-dimensional schematic diagram of the upper inner sleeve and the lower inner sleeve;

[0021] Figure 4 It is a three-dimensional diagram of the upper jacket and the lower jacket, and for the sake of clarity, the tightening pins are retained in the figure;

[0022] FIG5( a ) is a perspective view of the stiffening beam, support, slider and sliding lug assembled together;

[0023] Figure 5(b) is a three-dimensional schematic diagram of the stiffening beam, support, slider and sliding lug after disassembly;

[0024] Figure 6 It is an enlarged three-dimensional schematic diagram of the slider;

[0025] Figure 7 is an enlarged perspective diagram of two elastic strips assembled together;

[0026] Figure 8 It is an enlarged three-dimensional schematic diagram of tightening a nail;

[0027] Figure 9(a) is a schematic diagram of the change in cable force in a traditional connection cable;

[0028] FIG9( b ) is a schematic diagram of the adaptive adjustment of the cable force of the connection cable of the connection node system of the prestressed fiber composite cable with coordinated shear-torque release according to the present invention.

[0029] exist Figures 1 to 8 Among them, number 1 is the upper outer sleeve; number 2 is the lower outer sleeve; number 3 is the upper inner sleeve; number 4 is the lower inner sleeve; number 5 is the main cable; number 6 is the nut; number 7 is the screw; number 8 is the sling; number 9 is the slider; number 10 is the stiffening beam; number 11 is the upper outer sleeve; number 12 is the upper rib; number 13 is the limit stop; number 14 is the support; number 15 is the sliding lug; number 16 is the slide; number 17 is the buffer ; Label 18 is a tightening nail; Label 19 is an elastic strip; Label 21 is a lower outer sleeve; Label 22 is a lower side rib; Label 23 is a lifting ear; Label 24 is a lifting ear hole; Label 31 is an upper inner sleeve; Label 32 is an upper end rib; Label 33 is a side groove; Label 34 is a rectangular boss; Label 35 is a rectangular groove; Label 36 is a center hole; Label 37 is a fixing nail; Label 41 is a lower inner sleeve; Label 42 is a lower end rib. DETAILED DESCRIPTION

[0030] like Figures 1 to 8 As shown, the connection node system of the prestressed fiber composite cable with coordinated shear-torque release of the present invention includes: an upper outer sleeve 1, a lower outer sleeve 2, an upper inner sleeve 3, a lower inner sleeve 4, a sling 8 and a support 14.

[0031] The upper jacket 1 includes: an upper outer sleeve 11 and upper ribs 12, the upper outer sleeve 11 is a semicircular cylinder, and the two upper ribs 12 are respectively fixed on both sides of the upper outer sleeve 11; the lower jacket 2 includes: a lower outer sleeve 21, a lower rib 22 and a lifting ear 23, the lower outer sleeve 21 is a semicircular cylinder, and the two lower ribs 22 are respectively fixed on both sides of the lower outer sleeve 21; the cross-sections of the upper outer sleeve 11 and the lower outer sleeve 21 form a circle, along the length direction of the lower outer sleeve 21, the lifting ear 23 is fixed to the lower end of the lower outer sleeve 21, and a lifting ear hole 24 is opened on the lifting ear 23, the upper ribs 12 and the lower ribs 22 are aligned up and down, and in the length direction thereof, the upper jacket 1 and the lower jacket 2 are fixed together by a number of screws 7 and nuts 6.

[0032] The upper inner sleeve 3 includes: an upper inner sleeve 31 and an upper end rib 32, the upper inner sleeve 31 is a semicircular cylinder, the two upper end ribs 32 are respectively fixed to the front and rear ends of the upper inner sleeve 31, the upper inner sleeve 31 is mounted on the inner side of the upper outer sleeve 11, and the two upper end ribs 32 are respectively located at the front and rear ends of the upper outer sleeve 11; the lower inner sleeve 4 includes: a lower inner sleeve 41 and a lower end rib 42, the lower inner sleeve 41 is a semicircular cylinder, the two lower end ribs 42 are respectively fixed to the front and rear ends of the lower inner sleeve 41, the lower inner sleeve 41 is mounted on the inner side of the lower outer sleeve 21, and the two lower end ribs 42 are respectively located at the front and rear ends of the lower outer sleeve 21, between the upper inner sleeve 31 and the lower inner sleeve In the length direction of the contact point of the sleeve 41, a rectangular boss 34 and a rectangular groove 35 are respectively provided on the upper inner sleeve 31 and the lower inner sleeve 41, and the two upper end ribs 32 and the lower end ribs 42 are aligned up and down, so that the side surfaces of the upper inner sleeve 31 and the lower inner sleeve 41 are tightly meshed together, and the upper inner sleeve 3 and the lower inner sleeve 4 are fixed together by the screw 7 and the nut 6. The main cable 5 is clamped between the upper outer sleeve 1, the upper inner sleeve 3 and the lower outer sleeve 2, the lower inner sleeve 4. One end of the sling 8 is fixed to the lifting ear hole 24 by a fastener, and the other end is fixed to the support 14 by a fastener. The support 14 is fixed to the stiffening beam 10 by a fastener.

[0033] The connection node system of the prestressed fiber composite cable with coordinated shear-torque release of the present invention also includes: a tightening nail 18, an elastic strip 19, a slider 9, a sliding lug 15 and a fixing nail 37. Semi-circular side grooves 33 are respectively opened on the inner semi-circular surfaces of the two upper end ribs 32 and the two lower end ribs 42 of the upper inner sleeve 3 and the lower inner sleeve 4. Fixing nails 37 are respectively fixed at both ends of the above-mentioned side grooves 33. Two elastic strips 19 are installed in the above-mentioned side grooves 33. One end of the above-mentioned elastic strips 19 is respectively fixed to the fixing nails 37 at both ends, and the other ends of the two elastic strips 19 are both sleeved on the tightening nail 18. Tightening pins 18 pass through center holes 36 and side grooves 33, respectively, and are secured to the ends of the corresponding upper outer sleeve 11 and lower outer sleeve 21. Center holes 36 are located at the center of the semicircular surfaces outside the two upper ribs 32 and the two lower ribs 42, respectively, and communicate with the corresponding side grooves 33. A chute 16 is formed on the support 14, and the slider 9 moves within the chute 16. A limit block 13 is mounted at each end of the chute 16 to limit the travel of the slider 9. Buffers 17 are mounted at each end of the slider 9, such that the buffers 17 first contact the limit blocks 13. Buffers 17 are springs, energy dissipators, or dampers. A sliding lug 15 is fixed to the upper end of the slider 9, and the other end of the sling 8 is mounted on the sliding lug 15.

[0034] The connection node system of the prestressed fiber composite cable with coordinated shear-torque release of the present invention actively releases the additional torque and bending stress of the main cable, cable clamp, and sling through structural measures, effectively reduces the adverse effects of out-of-plane deformation, and improves the adaptability of the cable system to earthquake and wind loads, as can be seen from the force analysis of the main cable, cable clamp, and sling in Figure 9.

[0035] The above describes the technical content of the present invention, but the scope of protection of the present invention is not limited to the said content. Within the scope of knowledge possessed by ordinary technicians in this field, various changes can be made to the technical content of the present invention without departing from the purpose of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A connection node system for prestressed fiber composite cables with coordinated shear-torque release, comprising: An upper outer sleeve (1), a lower outer sleeve (2), an upper inner sleeve (3), a lower inner sleeve (4), a sling (8) and a support (14), wherein the upper outer sleeve (1) comprises an upper outer sleeve (11) and an upper side rib (12), wherein the upper outer sleeve (11) is a semicircular cylinder, and two upper side ribs (12) are respectively fixed on both sides of the upper outer sleeve (11); and the lower outer sleeve (2) comprises a lower outer sleeve (21), a lower side rib (22) and a lifting lug (23), wherein the lower outer sleeve (21) is a semicircular cylinder, and two lower side ribs (22) are respectively fixed on both sides of the lower outer sleeve (21); cross sections of the upper outer sleeve (11) and the lower outer sleeve (21) form a circle, and along the length direction of the lower outer sleeve (21), The lifting ear (23) is fixed to the lower end of the lower outer sleeve (21), and a lifting ear hole (24) is opened on the lifting ear (23). The upper rib (12) and the lower rib (22) are aligned up and down. In the length direction, the upper outer sleeve (1) and the lower outer sleeve (2) are fixed together by a plurality of screws (7) and nuts (6); the upper inner sleeve (3) includes: an upper inner sleeve (31) and upper end ribs (32). The upper inner sleeve (31) is a semicircular cylinder. The two upper end ribs (32) are respectively fixed to the front and rear ends of the upper inner sleeve (31). The upper inner sleeve (31) is installed on the inner side of the upper outer sleeve (11). The two upper end ribs (32) are respectively located at the front and rear ends of the upper outer sleeve (11).The lower inner sleeve (4) comprises: a lower inner sleeve (41) and a lower end rib (42). The lower inner sleeve (41) is a semicircular cylinder. The two lower end ribs (42) are respectively fixed to the front and rear ends of the lower inner sleeve (41). The lower inner sleeve (41) is mounted on the inner side of the lower outer sleeve (21). The two lower end ribs (42) are respectively located at the front and rear ends of the lower outer sleeve (21). The two upper end ribs (32) and the lower end rib (42) are respectively aligned up and down, and the upper inner sleeve (3) and the lower inner sleeve (4) are fixed by a screw (7) and a nut (6). The main cable (5) is clamped between the upper outer sleeve (1), the upper inner sleeve (3) and the lower outer sleeve (2), the lower inner sleeve (4), one end of the sling (8) is fixed to the lifting ear hole (24) by a fastener, and the other end is fixed to the support (14) by a fastener, and the support (14) is fixed to the stiffening beam (10) by a fastener. It is characterized in that it also includes: a tightening nail (18), an elastic strip (19), a slider (9), a sliding lug (15) and a fixing nail (37), which are fixed between the upper inner sleeve (3) and the lower inner sleeve. The inner semicircular surfaces of the two upper end ribs (32) and the two lower end ribs (42) of the sleeve (4) are respectively provided with semicircular side grooves (33), and fixing nails (37) are respectively fixed at both ends of the side grooves (33). Two elastic strips (19) are installed in the side grooves (33), and one end of the elastic strips (19) is respectively fixed on the fixing nails (37) at both ends. The other ends of the two elastic strips (19) are both sleeved on the tightening nails (18), and the tightening nails (18) are respectively passed through the center holes ( 36) and side grooves (33) are fixed at the two ends of the corresponding upper outer sleeve (11) and the two ends of the lower outer sleeve (21), and the center hole (36) is respectively located at the center of the semicircular surface outside the two upper end ribs (32) and the two lower end ribs (42), and is communicated with the corresponding side grooves (33); a slide groove (16) is opened on the support (14), and the slider (9) moves in the slide groove (16). A sliding ear (15) is fixed to the upper end of the slider (9), and the other end of the sling (8) is installed on the sliding ear (15).

2. The connection node system of prestressed fiber composite cables with coordinated shear-torque release according to claim 1, characterized in that: A limit block (13) is respectively installed at both ends of the slide groove (16) to limit the stroke of the slider (9).

3. The connection node system of prestressed fiber composite cables with coordinated shear-torque release according to claim 2, characterized in that: Buffering members (17) are installed at both ends of the slider (9), so that the buffering members (17) first contact with the limit block (13).

4. The connection node system of prestressed fiber composite cables with coordinated shear-torque release according to claim 3, characterized in that: The buffer member (17) is a spring, an energy dissipator or a damper.

5. The connection node system of prestressed fiber composite cables with coordinated shear-torque release according to claim 4, characterized in that: In the length direction of the contact point between the upper inner sleeve (31) and the lower inner sleeve (41), a rectangular boss (34) and a rectangular groove (35) are respectively provided on the upper inner sleeve (31) and the lower inner sleeve (41), so that the side surfaces of the upper inner sleeve (31) and the lower inner sleeve (41) are tightly meshed together.

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