Reset cable clamp for fiber composite cable structure

Abstract

The reset cable clamp for the fiber composite cable structure comprises an upper outer sleeve, a lower outer sleeve, an upper inner sleeve, a lower inner sleeve, an elastic pull rope and an end anchoring buckle, the upper outer sleeve comprises an upper outer sleeve and an upper edge rib, the lower outer sleeve comprises a lower outer sleeve and a lower edge rib, the upper inner sleeve comprises an upper inner sleeve and an upper end rib, and the lower inner sleeve comprises a lower inner sleeve and a lower end rib. An upper groove and a lower groove are formed in the outer circumferential surfaces of the upper inner sleeve and the lower inner sleeve in the length direction respectively, at least one protruding block is fixed to the positions, corresponding to the upper groove and the lower groove, of the inner circumferential surfaces of the upper outer sleeve and the lower outer sleeve, and each elastic pull rope penetrates through the corresponding upper end rib, the corresponding upper groove and the corresponding upper end rib. The two ends of each elastic pull rope are fixed to the upper end rib or the lower end rib through the end anchoring buckles respectively, and the protruding blocks are arranged on one side of each elastic pull rope and used for blocking the elastic pull ropes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable structure, and in particular, relates to a reset cable clamp for a fiber composite cable structure. BACKGROUND

[0002] Cable structure has the advantages of light structure and high material efficiency, and is widely used in the fields of bridges, roof structures, space structures and the like. The cable clamp is a key load transmission component in the cable structure, and its main function is to connect the main cable and the sling to transmit the load. Therefore, the stable stress of the cable clamp is very important for the reliability of the entire cable system.

[0003] The cable clamp commonly used in engineering at present mainly adopts a pin shaft type connection, which is divided into upper and lower parts. The two parts are clamped to the main cable through bolt connection, and the cable clamp is fixed on the main cable by relying on friction. This connection form can efficiently transmit in-plane load under static working conditions. However, under the action of extreme loads such as earthquakes or strong winds, the stress state of the cable clamp will change significantly when the structure deforms out of plane. At this time, the cable clamp may bear shear force in a non-design direction and additional bending moment, which will cause the loss of bolt pretightening force, so that the friction force of the contact surface between the cable clamp and the main cable is not enough to resist the transverse load, and finally leads to slip failure.

[0004] For the cable structure using fiber composite main cable, the above problems are more serious. Under the action of adverse loads such as earthquakes or strong winds, the cable clamp is not only easy to be damaged or even failed, but more importantly, the fiber composite main cable may bear excessive cross-section torsion and shear stress, which has a serious risk of failure.

[0005] Chinese patent CN200620098950.3 discloses a "rotatable suspension bridge cable clamp", which solves the problem that the existing cable clamp cannot rotate and is not convenient to install during the construction process of clamping the main cable of the suspension bridge from the empty cable state to the bridge state. Although it includes an upper inner sleeve and a lower inner sleeve, the circumferential structure, function and effect are different from those of the present application. More importantly, the cable clamp system in the above patent has limited energy dissipation capacity and lacks recoverability during the service of the structure, which may cause the problem of insufficient structural toughness of the cable clamp under the action of extreme loads.

[0006] In the prior art, the cable clamp of the cable structure is easy to produce significant changes in stress behavior under the out-of-plane deformation condition of the structure, and cannot provide sufficient energy dissipation capacity and recoverability, resulting in reduced structural reliability. At present, there is still a lack of effective solutions to this key technical problem. SUMMARY

[0007] Therefore, the present application provides a reset cable clamp for fiber composite cable structure, which can realize self-adaptive rotation and automatic reset when the cable system is deformed out of plane, effectively avoid excessive accumulation of torque, thereby significantly reduce the additional bending stress of the cable clamp and the cross-sectional torsional stress transmitted to the main cable.

[0008] The reset cable clamp for fiber composite cable structure comprises an upper outer sleeve, a lower outer sleeve, an upper inner sleeve and a lower inner sleeve, the upper outer sleeve comprises an upper outer sleeve cylinder and two upper edge ribs, the upper outer sleeve cylinder is a semicircular cylinder, and the two upper edge ribs are fixed on the two sides of the upper outer sleeve cylinder; the lower outer sleeve comprises a lower outer sleeve cylinder and two lower edge ribs, the lower outer sleeve cylinder is a semicircular cylinder, and the two lower edge ribs are fixed on the two sides of the lower outer sleeve cylinder; the cross sections of the upper outer sleeve cylinder and the lower outer sleeve cylinder form a circle, the upper edge ribs and the lower edge ribs are vertically aligned, and the upper outer sleeve and the lower outer sleeve are fixed together in the length direction by a plurality of short screws and nuts; the upper inner sleeve comprises an upper inner sleeve cylinder and two upper end ribs, the upper inner sleeve cylinder is a semicircular cylinder, the two upper end ribs are fixed on the front and rear ends of the upper inner sleeve cylinder, the upper inner sleeve cylinder is arranged inside the upper outer sleeve cylinder, and the two upper end ribs are located at the front and rear ends of the upper outer sleeve cylinder; the lower inner sleeve comprises a lower inner sleeve cylinder and two lower end ribs, the lower inner sleeve cylinder is a semicircular cylinder, the two lower end ribs are fixed on the front and rear ends of the lower inner sleeve cylinder, the lower inner sleeve cylinder is arranged inside the lower outer sleeve cylinder, and the two lower end ribs are located at the front and rear ends of the lower outer sleeve cylinder, the two upper end ribs and the two lower end ribs are vertically aligned, and the upper inner sleeve and the lower inner sleeve are fixed together by a long screw and a nut, and the main cable is clamped between the upper outer sleeve, the upper inner sleeve, the lower outer sleeve and the lower inner sleeve.

[0009] The lower end of the protrusion is in the form of a circular arc, and the distance between the lower end of the protrusion and the upper groove or the lower groove is less than 0.5 times the diameter of the elastic rope.

[0010] Two upper grooves and two lower grooves are respectively formed on the circumferential outer surface of the upper inner sleeve cylinder and the lower inner sleeve cylinder in the length direction.

[0011] The protrusion is inside each elastic rope in the two upper grooves or the two lower grooves.

[0012] The reset cable clamp for the fiber composite cable structure of the present application, wherein: the outer side of the protrusion of each elastic pull rope in the two upper grooves or the two lower grooves.

[0013] The reset cable clamp for the fiber composite cable structure of the present application, wherein: two or three protrusions are fixed on the circumferential inner surface of the upper outer sleeve and the lower outer sleeve corresponding to the upper groove or the lower groove, and the protrusions are on a straight line parallel to the generatrix of the upper outer sleeve or the lower outer sleeve.

[0014] The reset cable clamp for the fiber composite cable structure of the present application, wherein: a rectangular boss and a rectangular groove are respectively formed on the upper inner sleeve and the lower inner sleeve in the length direction of the contact position of the upper inner sleeve and the lower inner sleeve, so that the side surfaces of the upper inner sleeve and the lower inner sleeve are closely engaged together.

[0015] The reset cable clamp for the fiber composite cable structure of the present application, wherein: the lower outer sleeve further comprises: an ear fixed at the lower end of the lower outer sleeve along the length direction of the lower outer sleeve, and at least one ear hole is formed on the ear.

[0016] The present application realizes the active release of the bending stress of the cable clamp and the additional torque of the main cable by structural measures, effectively reduces the adverse effects of the out-of-plane deformation of the structure, and simultaneously enhances the post-disaster self-recovery ability of the structure by using the self-resetting assembly, thereby significantly improving the safety and recoverability of the cable system under the action of earthquake and wind load.

[0017] The present application effectively solves the key technical problem that the out-of-plane deformation of the structure causes the significant change of the stress state of the main force component under the action of earthquake or strong wind.

[0018] Through the above technical solutions, the present application can achieve the following significant beneficial effects:

[0019] 1) Active release of additional bending stress of cable clamp to realize performance improvement

[0020] The connection mode can effectively reduce the additional bending stress of the cable clamp itself by the self-adaptive rotation mechanism of the cable clamp, prevent the plastic deformation of the inner and outer sleeves of the cable clamp due to excessive torsional stress, and simultaneously prevent the loss of pre-tightening force or the slipping phenomenon of the sleeve bolts due to the torsional torque.

[0021] 2) Active release of additional torque of main cable to realize the protection of the main cable

[0022] The connecting mode can realize adaptive release of the additional torque of the main cable through rotation between the inner and outer tubes of the cable clamp, and effectively avoid excessive torsional shear stress of the main cable section. Especially for the main cable using fiber composite material, the material shear and torsion resistance is poor, and avoiding excessive torsional stress of the main cable section is of great significance to ensure the overall structural reliability.

[0023] 3) The overall structure realizes a substantial increase in the anti-disaster capability through a self-resetting-energy-consuming mechanism

[0024] In the rotation-resetting cycle of the cable clamp, the friction between the inner wall of the inner tube and the outer wall of the outer tube can dissipate a large amount of energy, improve the energy consumption capacity of the overall structure under the over-limit earthquake and wind load, and realize the structure to return to the initial design state after the extreme load disappears, thereby greatly reducing the repair cost. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic view of the reset cable clamp for the fiber composite cable structure of the application;

[0026] Figure 2 It is an exploded three-dimensional schematic view of the reset cable clamp for the fiber composite cable structure of the application after the short screw rod, long screw rod and nut are removed;

[0027] Figure 3 It is a three-dimensional schematic view of the upper and lower inner sleeves in the assembled state;

[0028] Figure 4 It is an exploded three-dimensional schematic view of the upper and lower inner sleeves;

[0029] Figure 5 It is a three-dimensional schematic view of the upper and lower outer sleeves in the assembled state;

[0030] Figure 6 It is a front enlarged schematic view of the protruding block;

[0031] Figure 7 It is a three-dimensional schematic view of the elastic pull rope and the end anchoring buckle in the assembled state.

[0032] In Figures 1 to 7Among 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 short screw; number 8 is the long screw; number 9 is the elastic pull rope; number 10 is the end anchor buckle; number 11 is the upper outer sleeve; number 12 is the upper side rib; number 13 is the protrusion; number 21 is the lower outer sleeve; number 22 is the lower side rib; number 23 is the lifting ear; number 24 is the lifting ear hole; number 31 is the upper inner sleeve; number 32 is the upper end rib; number 33 is the upper groove; number 34 is the rectangular boss; number 35 is the rectangular groove; number 41 is the lower inner sleeve; number 42 is the lower end rib; number 43 is the lower groove. DETAILED DESCRIPTION

[0033] like Figures 1 to 7 As shown, the resetting cable clamp for a fiber composite cable structure of the present invention comprises an upper outer sleeve 1, a lower outer sleeve 2, an upper inner sleeve 3, and a lower inner sleeve 4. The upper outer sleeve 1 comprises an upper outer sleeve 11 and upper side ribs 12. The upper outer sleeve 11 is a semicircular cylinder with two upper side ribs 12 fixed to either side of the upper outer sleeve 11. The lower outer sleeve 2 comprises a lower outer sleeve 21, lower side ribs 22, and a lifting lug 23. The lower outer sleeve 21 is a semicircular cylinder with two lower side ribs 22 fixed to either side of the lower outer sleeve 21. The lifting lug 23 is fixed to the lower end of the lower outer sleeve 21 along its length. At least one lifting lug hole 24 is formed in the lifting lug 23. The cross-sections of the upper outer sleeve 11 and the lower outer sleeve 21 form a circle. The upper side ribs 12 and the lower side ribs 22 are aligned vertically. The upper outer sleeve 1 and the lower outer sleeve 2 are fixed together along their length by a plurality of short screws 7 and nuts 6.

[0034] 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, and the two upper ribs 32 and the lower ribs 42 are aligned up and down respectively. In the length direction of the contact point between the upper inner sleeve 31 and the lower inner sleeve 41, the upper inner sleeve 31 and the lower inner sleeve 41 are respectively provided with a rectangular boss 34 and a rectangular groove 35, 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 a long screw 8 and a nut 6, and 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.

[0035] The reset cable clamp for fiber composite cable structure of the present application further comprises elastic pull ropes 9 and end anchoring buckles 10, two upper grooves 33 and two lower grooves 43 are respectively formed on the circumferential outer surfaces of the upper inner sleeve 31 and the lower inner sleeve 41 along the length direction, two protrusions 13 are fixed on the circumferential inner surfaces of the upper outer sleeve 11 and the lower outer sleeve 21 corresponding to each of the upper grooves 33 and the lower grooves 43, as shown in Figure 6 the lower end of the protrusion 13 is arc-shaped, the distance between the lower end of the protrusion 13 and the upper groove 33 or the lower groove 43 is less than 0.3 times the diameter of the elastic pull rope 9, and the protrusion 13 is located on a straight line parallel to the generatrix of the upper outer sleeve 11 or the lower outer sleeve 21. Each elastic pull rope 9 passes through the upper end rib 32, the upper groove 33 and the upper end rib 32, and the lower end rib 42, the lower groove 33 and the lower end rib 42, respectively, and the two ends of each elastic pull rope 9 are fixed on the upper end rib 32 or the lower end rib 42 through the end anchoring buckle 13, and the elastic pull rope 9 is blocked on the inner side or the outer side of the protrusion 13 in the two upper grooves 33 or the two lower grooves 43, so as to help the inner sleeve 31 and the lower inner sleeve 41 to reset.

[0036] The reset cable clamp for fiber composite cable structure of the present application has the following steps from design to installation:

[0037] 1) Structural design

[0038] According to the load working condition of the sling connected by the sling ear of the cable clamp, mechanical analysis is carried out, and the size and wall thickness of the sling ear, the upper outer sleeve 1, the lower outer sleeve 2, the upper inner sleeve 3 and the lower inner sleeve 4 are designed; according to the reset ability required by the cable clamp, the diameter of the elastic pull rope 9 in the reset assembly is designed to provide sufficient reset ability after the upper inner sleeve 3 and the lower inner sleeve 4 of the cable clamp rotate;

[0039] 2) Inner sleeve installation

[0040] The upper inner sleeve 3 and the lower inner sleeve 4 of the cable clamp are installed to the specified position on the main cable 5, and the upper and lower two parts of the upper inner sleeve 3 and the lower inner sleeve 4 are firmly connected through the high-strength long screw rod 8 and the nut 6;

[0041] 3) Installation of reset assembly

[0042] The two ends of the reset assembly, i.e. the elastic pull rope 9, are respectively installed on the upper end rib 32 or the lower end rib 42 through the end anchoring buckle 10, and the end anchoring buckle 10 is not completely tightened after installation;

[0043] 4) Outer sleeve installation

[0044] The upper outer sleeve 1 and the lower outer sleeve 2 of the cable clamp are installed to the corresponding positions of the upper inner sleeve 3 and the lower inner sleeve 4, and the upper and lower two parts of the cable clamp are connected and fixed through the high-strength short screw rod 7 and the nut 6, and the bolt force value is determined according to the required friction force.

[0045] 5) Reset assembly tensioning

[0046] After the upper sleeve 1 and the lower sleeve 2 are installed, the protrusions 13 fixed to the inner walls of the upper sleeve 1 and the lower sleeve 2 can abut against the elastic pull ropes 9, and the interaction force between the elastic pull ropes 9 and the protrusions 13 is generated by tightening the end anchoring buckles 10 at both ends of the reset assembly, so that the four groups of reset assemblies are respectively anchored and tensioned to adjust the relative positions of the upper sleeve 1, the lower sleeve 2, the upper inner sleeve 3 and the lower inner sleeve 4, and to realize that the reset assembly can provide sufficient reset force after the inner and outer cylinders rotate.

[0047] The upper inner sleeve 3 and the lower inner sleeve 4 are connected by bolts to form a cylindrical whole body and are fixed to a predetermined position on the main cable 5; the upper groove 33 and the lower groove 43 serve as the movement space of the elastic pull rope 9 of the self-resetting assembly.

[0048] The upper sleeve 1 and the lower sleeve 2 are connected by high-strength bolts, the protrusions 13 are fixed to the inner walls of the upper sleeve 1 and the lower sleeve 2, can move in the upper groove 33 or the lower groove 43 and generate an interaction force with the elastic pull rope 9 of the self-resetting assembly, so as to realize the self-resetting capability of the inner and outer cylinders; the lifting lugs 23 are used to connect with the lower cables.

[0049] As shown in Figure 7 the self-resetting assembly includes the elastic pull rope 9 and the end anchoring buckle 10, when the cable system is subjected to out-of-plane deformation due to earthquake or wind load, the inner and outer cylinders rotate relative to each other, the protrusions 13 of the outer cylinder drive the elastic pull rope 9 to move in the upper groove 33 or the lower groove 43, the elastic pull rope 9 is elongated to generate a restoring force and an interaction force of reverse extrusion on the protrusions 13, so that the inner and outer cylinders realize the self-resetting capability by the interaction force after the earthquake or wind load disappears.

[0050] The elastic pull rope 9 is tensioned during installation, and there is an interaction force between the elastic pull rope 9 and the protrusions 13, so that the inner and outer cylinders cannot be easily rotated, and only when the inner cylinder is subjected to a force greater than the elastic pull rope 9 can it rotate. When subjected to load and rotated, the elastic pull rope 9 will become tighter and tighter, and the interaction force between the elastic pull rope 9 and the protrusions 13 will increase, providing greater reset force.

[0051] The technical content of the present application has been described above, but the protection scope of the present application is not limited to the content described, and various changes can be made to the technical content of the present application within the knowledge possessed by those skilled in the art without departing from the purpose of the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A resetting cable clamp for a fiber composite cable structure, comprising: The upper outer sleeve (1), the lower outer sleeve (2), the upper inner sleeve (3) and the lower inner sleeve (4), the upper outer sleeve (1) includes: an upper outer sleeve (11) and an upper rib (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 outer sleeve (2) includes: a lower outer sleeve (21) and a lower rib (22), 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, the upper rib (12) and the lower rib (22) are aligned up and down, and in the length direction, a plurality of A short screw (7) and a nut (6) are used to fix the upper outer sleeve (1) and the lower outer sleeve (2) together; 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, and 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, and 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 installed 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). The two upper end ribs (32) and the lower end ribs (42) are respectively aligned up and down, and the upper inner sleeve (3) and the lower inner sleeve (4) are fixed together by a long screw (8) 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), and the lower inner sleeve (4). It is characterized in that: the reset cable clamp for the fiber composite cable structure also includes: an elastic pull rope (9) and an end anchor buckle (10), which are divided on the circumferential outer surface along the length direction of the upper inner sleeve (31) and the lower inner sleeve (41). An upper groove (33) and a lower groove (43) are separately provided. At least one protrusion (13) is fixed on the circumferential inner surface of the upper outer sleeve (11) and the lower outer sleeve (21) corresponding to the upper groove (33) and the lower groove (43). Each elastic pull rope (9) passes through the upper end rib (32), the upper groove (33) and the upper end rib (32); the lower end rib (42), the lower groove (33) and the lower end rib (42). The two ends of each elastic pull rope (9) are fixed on the upper end rib (32) or the lower end rib (42) through the end anchor buckle (13). The protrusion (13) is on one side of each elastic pull rope (9) to block the elastic pull rope (9).

2. The resetting cable clamp for a fiber composite cable structure according to claim 1, characterized in that: The lower end of the protrusion (13) is arc-shaped, and the distance between the lower end and the upper groove (33) or the lower groove (43) is less than 0.3 times the diameter of the elastic drawstring (9).

3. The resetting cable clamp for a fiber composite cable structure according to claim 2, wherein: Two upper grooves (33) and two lower grooves (43) are respectively formed on the circumferential outer surfaces of the upper inner sleeve (31) and the lower inner sleeve (41) along the length direction.

4. The resetting cable clamp for a fiber composite cable structure according to claim 3, wherein: Each elastic drawstring (9) is located on the inner side of the protrusion (13) in the two upper grooves (33) or the two lower grooves (43).

5. The resetting cable clamp for a fiber composite cable structure according to claim 3, wherein: Each elastic drawstring (9) is located outside the protrusion (13) in the two upper grooves (33) or the two lower grooves (43).

6. The resetting cable clamp for a fiber composite cable structure according to claim 4 or 5, characterized in that: Two or three protrusions (13) are fixed on the circumferential inner surfaces of the upper outer sleeve (11) and the lower outer sleeve (21) corresponding to the upper groove (33) or the lower groove (43), and the protrusions (13) are located on a straight line parallel to the generatrix of the upper outer sleeve (11) or the lower outer sleeve (21).

7. The resetting cable clamp for a fiber composite cable structure according to claim 6, 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.

8. The resetting cable clamp for a fiber composite cable structure according to claim 7, characterized in that: The lower outer sleeve (2) further comprises a lifting ear (23) which is fixed to the lower end of the lower outer sleeve (21) along the length direction of the lower outer sleeve (21) and has at least one lifting ear hole (24) formed on the lifting ear (23).

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