Cable structure wire rope net damping vibration reduction device

Abstract

A cable structure steel wire rope net damping vibration reduction device, it is characterized in of: the steel wire rope net damping vibration reduction device includes steel wire rope net (2), intermediate node (3) and anchorage node (4), steel wire rope net (2) is formed by one or more steel wire ropes interlaced connection net structure, steel wire rope net (2) is fixedly arranged on the multiple cable structures (1) at the same side of bridge, the multiple steel wires of the intersection part on steel wire rope net (2) are connected together through intermediate node (3), steel wire rope net (2) and cable structure (1) are connected through anchorage node (4), the present application is compact in structure, does not occupy the precious space of bridge deck, does not produce disturbance to bridge deck traffic, long service life, not only can reach excellent energy dissipation effect, but also can fundamentally effectively inhibit the vibration of each cable structure, has very good damping effect to bridge.

Description

TECHNICAL FIELD

[0001] The present application relates to a cable structure damping device, in particular to a cable structure steel wire rope net damping device, belonging to the technical field of bridge shock isolation. BACKGROUND

[0002] With the rapid development of bridge industry, the number of long-span bridge structures such as cable-stayed bridges, suspension bridges and arch bridges built at home and abroad is increasing. The vibration of the stay cable (or suspender) system used in these structures under the excitation of wind and environmental factors is prone to fatigue. There are examples of cable-stayed bridges that have been in operation for less than ten years having to replace the cables due to excessive cable breakage or even cable breakage. As we all know, stay cables or suspenders are extremely important load-bearing components of bridges. Therefore, if the wind-induced vibration of stay cables is not controlled within a safe range, not only the safety of stay cables and even the entire bridge will be endangered, but also the service life of the bridge will be affected, resulting in huge losses in social and economic benefits.

[0003] The existing stay cable or suspender damping mainly has the following structural forms: 1. Adopting aerodynamic damping measures, which change the cross-sectional shape of the stay cable or suspender to change the flow guide and thus achieve damping, such as setting ribs on the stay cable, setting pits on the stay cable, setting helical lines on the stay cable, etc. The development and structural details of various schemes in aerodynamic damping measures need to be verified by experiments for their damping effect, and attention should be paid to not increasing the drag coefficient of the stay cable section and avoiding other unstable vibrations. At present, it is still impossible to analyze by computational fluid dynamics. Therefore, the mechanism of action of aerodynamic damping measures cannot be theoretically analyzed.

[0004] 2. Two-order cable method, which specifically connects each main stay cable or suspender with stainless steel wire, which functions to improve the overall stiffness of the stay cable system or suspender system, increase the modal mass and damping of the stay cable, and cause mutual coupling between modes when the stay cable vibrates. Although the damping principle of two-order cable is very simple, some experience has been gained in practice, but its application in actual engineering is not very common. Because there is no perfect design theory, it can only rely on experience, and in addition, it is high-altitude operation, so it is difficult to control the pre-tightening force. Therefore, two-order cable breakage and cable clamp breakage occur. In addition, two-order cable cannot completely eliminate the out-of-plane vibration of parallel cables and spatial cables. More importantly, for long and large cable-stayed bridges, multiple two-order cables are often needed, which are often referred to as "spider webs", damaging the landscape of the bridge, so they are often not accepted by bridge designers.

[0005] Three, the damping rubber vibration ring is used to transfer the force between the rubber and the cable, and the viscous damping energy is generated by the deformation of the rubber ring. The damping rubber vibration ring can be arranged in the guide cylinder of the cable, and has good landscape effect. The rubber ring structure is simple and easy to install, but the damping provided by the rubber ring is limited due to its proximity to the anchor end, and can only produce some damping effect on short cables. If the cable deviates from the center of the guide cylinder during construction, the rubber ring will crack and break within a year.

[0006] Four, oil pressure damper, oil pressure damper is mostly used in cable damping method in Europe and the United States, but oil pressure damper can only provide one-way damping force. If oil pressure damper is used to suppress the in-plane and out-of-plane vibration of cable at the same time, two oil pressure dampers need to be installed on each cable and arranged orthogonally. The installation precision of oil pressure damper is relatively high, and the temperature effect of silicon oil as damping medium is obvious. Due to frequent operation, oil leakage and seepage are prone to occur, so the maintenance cost is relatively high. However, the main problem of oil pressure damper is that it is not sensitive to small amplitude vibration. Due to the "modal transition" of long cable, the in-plane first symmetric vibration amplitude near the anchor end will become very small, so the actual damping value of oil pressure damper for in-plane first mode is much lower than the design damping value.

[0007] Five, viscous shear type damper, viscous shear type damper (VSD) is a new type of damping device that appeared in recent years. Its characteristic is that the shear deformation of viscous body is generated by the movement of the shear piece in the damper, so as to transfer the vibration energy to the viscous body and then convert it into heat energy dissipation. Compared with oil pressure damper, viscous shear type damper is sensitive to 0.5mm level of micro vibration, and one VSD can suppress the vibration in both in-plane and out-of-plane directions of cable without mechanical contact point. However, the damping force of viscous shear type damper is easily affected by temperature change during use, and the working solution is prone to leakage.

[0008] Six, lever mass damper, when the cable is vibrating, the connecting rod transmits the movement of the cable clamp to the lever, causing the lever and the mass to move up and down. The movement of the mass generates an inertial force, and the movement of the damper part connected to the lever generates an elastic force and a damping force. These forces are amplified by the lever and then transmitted to the cable through the connecting rod, thereby suppressing the vibration of the cable. The lever mass damper device consists of two parts: the damper part and the lever amplification part. The damper does not suppress the original signal of the cable vibration, but the amplified vibration signal. The damping effect on the out-of-plane vibration of the cable is not ideal.

[0009] In summary, the damping technology of several common cables or hangers in the prior art has certain technical drawbacks and use limitations, either poor damping effect, or unreliable use and durability. The present application overcomes the defects of the existing cable or hanger damping structure, representing a certain degree of technical progress. SUMMARY

[0010] The purpose of the present application is to overcome the technical drawbacks and use limitations of the existing cable or hanger damping structure, poor damping effect, limited vibration suppression capacity, frequent maintenance, and short service life. The cable structure steel wire rope net damping device not only achieves excellent energy dissipation and damping effect, but also effectively suppresses the vibration of each cable structure, and has good damping effect on the bridge.

[0011] To achieve the purpose of the application, the technical solution of the present application is: a cable structure steel wire rope net damping device, which comprises a steel wire rope net, an intermediate node and an anchoring node. The steel wire rope net is a net-like structure formed by one or more steel wire ropes interlaced and connected. The steel wire rope net is fixedly arranged on a plurality of cable structures on the same side of the bridge. The plurality of steel wire ropes at the intersection of the steel wire rope net are connected together through the intermediate node. The steel wire rope net and the cable structure are connected through the anchoring node.

[0012] Further, the cable structure includes a cable and a hanger, and the steel wire rope net is arranged at the intermediate position of the cable or the hanger. The steel wire rope net is connected to two or more cables or hangers.

[0013] Further, the intermediate node and the anchoring node are distributed in a quincunx shape.

[0014] Further, the position of the intermediate node can move relatively with the displacement of the steel wire rope net, and the position of the anchoring node is relatively fixed. The anchoring node can only move as a whole with the swing of the cable or the hanger.

[0015] Further, the intermediate node adopts a double sleeve structure or other fixing fasteners. The double sleeve structure is two sleeve structures fixed together or a double sleeve structure integrally arranged.

[0016] Further, the anchoring node comprises a rope clamp, a cable clamp, a connecting bolt and a clamping bolt. The cable clamp is installed on the cable or the hanger, and is clamped and fixed by the clamping bolt. The rope clamp is installed on the steel wire rope strand of the steel wire rope net, and is connected to the cable clamp by the connecting bolt.

[0017] Further, the anchoring node comprises a cable clamp, a connecting bolt and a steel wire rope pressing sleeve, the cable clamp is installed on the cable-stayed cable or the suspender, the steel wire rope pressing sleeve is installed on the plurality of steel wire rope strands on the steel wire rope net, and the cable-stayed cable or the suspender and the steel wire rope pressing sleeve are clamped together through the cable clamp and are connected and fixed through the connecting bolt.

[0018] The beneficial effects of the present application are:

[0019] 1. The present application is provided with a steel wire rope net damper on a bridge cable structure, a plurality of steel wire ropes at the intersection position on the steel wire rope net are connected together through an intermediate node, and the steel wire rope net and the cable structure are connected through an anchoring node, so that the installation and dismounting are very convenient.

[0020] 2. The steel wire rope net damper of the present application generates torsion, elongation, shear and other physical deformations through the steel wire ropes in the rope net under stress, so that dry friction is generated between the mutually intertwined steel wires to dissipate energy, thereby achieving the technical effect of energy dissipation and vibration reduction, and the steel wire rope net increases the constraint between the cable structures and improves the overall stiffness, so that the vibrations between the cable structures are coupled with each other, the modal mass and the damping of the cable structure are increased, and the vibrations are mutually suppressed.

[0021] 3. The present application has a compact structure, does not occupy the valuable space of the bridge deck, does not interfere with the passage of the bridge deck, has a long service life, can not only achieve excellent energy dissipation and vibration reduction effect, but also can fundamentally and effectively suppress the vibration of each cable structure, and has a good vibration reduction effect on the bridge. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of the first embodiment of the present application.

[0023] Figure 2 is a structural schematic diagram of the second embodiment of the present application.

[0024] Figure 3 is a partial enlarged view of the steel wire rope net A part in the present application Figure 2

[0025] Figure 4 is a structural schematic diagram of the anchoring node embodiment one of the present application.

[0026] Figure 5 is a structural plane schematic diagram of the anchoring node embodiment one of the present application.

[0027] Figure 6 is an elevation view of the cable clamp of the present application.

[0028] Figure 7 is a plan view of the cable clamp of the present application.

[0029] Figure 8 is an elevation view of the rope clamp of the present application. ​

[0030] Figure 9 is a plan view of the rope clamp of the present application.

[0031] Figure 10 is a structural schematic view of the second embodiment of the anchoring node of the present application.

[0032] Figure 11 is a structural plan view of the second embodiment of the anchoring node of the present application.

[0033] Figure 12 is an elevation view of the cable clamp of the present application.

[0034] Figure 13 is a plan view of the cable clamp of the present application.

[0035] Figure 14 is a structural schematic view of the first embodiment of the intermediate node of the present application.

[0036] Figure 15 is a structural schematic view of the second embodiment of the intermediate node of the present application.

[0037] In the figure: cable structure 1, stay cable 1-1, suspender 1-2, steel wire rope net 2, intermediate node 3, anchoring node 4, rope clamp 5, cable clamp 6, connecting bolt 7, clamping bolt 8, steel wire rope pressing sleeve 9. Embodiment

[0038] The present application is described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] Referring to Figures 1 to 15 , the steel wire rope net damping vibration reduction device of the present application is characterized in that it comprises a steel wire rope net 2, an intermediate node 3 and an anchoring node 4, the steel wire rope net 2 is a net-like structure formed by one or more steel wire ropes being interwoven and connected, the steel wire rope net 2 is fixedly arranged on a plurality of cable structures 1 located on the same side of a bridge, the plurality of steel wire ropes at the intersection position of the steel wire rope net 2 are connected together through the intermediate node 3, and the steel wire rope net 2 is connected with the cable structures 1 through the anchoring node 4.

[0040] The cable structure 1 comprises a stay cable 1-1 and a suspender 1-2, and the steel wire rope net 2 is arranged at the middle position of the stay cable 1-1 or the suspender 1-2, and the steel wire rope net 2 is connected with two or more stay cables 1-1 or suspenders 1-2.

[0041] The intermediate node 3 and the anchoring node 4 are distributed in a plum blossom shape.

[0042] The position of the intermediate node 3 can move relatively with the displacement of the steel wire rope net 2, the position of the anchoring node 4 is relatively fixed, and the anchoring node 4 can only move as a whole with the swing of the stay cable 1-1 or the suspender 1-2.

[0043] The intermediate node 3 adopts a double sleeve structure or other fixed fasteners, and the double sleeve structure is two sleeve structures fixed together or a double sleeve structure integrally arranged.

[0044] The anchoring node 4 includes a rope clamp 5, a cable clamp 6, a connecting bolt 7 and a clamping bolt 8, the cable clamp 6 is installed on the inclined cable 1-1 or the suspender 1-2, the cable clamp 6 is clamped and fixed through the clamping bolt 8, the rope clamp 5 is installed on the steel wire strand of the steel wire rope net 2, and the rope clamp 5 is connected with the cable clamp 6 through the connecting bolt 7.

[0045] The anchoring node 4 includes a cable clamp 6, a connecting bolt 7 and a steel wire rope pressing sleeve 9, the cable clamp 6 is installed on the inclined cable 1-1 or the suspender 1-2, the steel wire rope pressing sleeve 9 is installed on the multiple steel wire strands of the steel wire rope net 2, the inclined cable 1-1 or the suspender 1-2 and the steel wire rope pressing sleeve 9 are clamped together through the cable clamp 6, and are connected and fixed through the connecting bolt 7.

[0046] As shown in the accompanying drawings, Figure 1 , Figure 2 The steel wire rope net damper is creatively adopted, the steel wire rope net damper is installed on the basis of the existing cable structure 1 of the bridge, such as the inclined cable 1-1 and the suspender 1-2, physical deformations such as torsion, elongation and shearing are generated in the steel wire rope in the rope net after being stressed, so that dry friction is generated between the mutually intertwined steel wires to consume energy, and the technical effect of energy dissipation and vibration reduction is achieved. Meanwhile, the steel wire rope net 2 increases the constraint on the cable structure 1, improves the overall stiffness, couples the vibrations between the cable structures 1, increases the modal mass and damping of the cable structure 1, suppresses the vibrations, and further improves the overall stability of the bridge.

[0047] The cable structure 1 mainly includes the inclined cable 1-1 and the suspender 1-2, and can also be other forms of cable structures. In order to achieve the effect of energy dissipation and vibration reduction and effectively suppress the vibration of the cable structure, the steel wire rope net damping and vibration reduction device is installed on the row of cable structures 1. The steel wire rope net damping and vibration reduction device mainly includes the steel wire rope net 2, the intermediate node 3 and the anchoring node 4. The steel wire rope net 2 is a net-shaped structure formed by one or more steel wire ropes intertwined and connected. The steel wire rope on the steel wire rope net 2 adopts a line contact type or a surface contact type steel wire rope, and a steel wire can be wound on the outer surface of the steel wire rope as necessary, which can further improve the damping performance of the steel wire rope net 2. The multiple steel wire ropes at the intersection position of the steel wire rope net 2 are connected together through the intermediate node 3, the steel wire rope net 2 and the cable structure 1 are connected through the anchoring node 4, and the steel wire rope net 2 and the multiple cable structures 1 are effectively connected through the anchoring node 4.

[0048] The steel wire rope net damper is installed at the middle position of the cable structure 1 as much as possible, because the amplitude is the largest at the middle position, so that the vibration of the cable structure can be inhibited to the maximum extent, and the best vibration inhibition effect is achieved. In addition to the anchor node 4, the adjacent two rows of steel wire ropes intersecting together are connected through the intermediate node 3, and the position of the intermediate node 3 moves relatively with the deformation of the steel wire rope net 2. The intermediate node 3 adopts a double sleeve structure or other fixing fasteners, and the double sleeve structure is a double sleeve structure fixed together or an integrated double sleeve structure.

[0049] The connection mode between the steel wire rope net 2 and the cable structure 1 has various modes, and the following two structure modes are mainly provided:

[0050] Embodiment one: the steel wire rope net 2 and the cable structure 1 are connected through the anchor node 4, the anchor node 4 includes a rope clamp 5, a cable clamp 6, a connecting bolt 7 and a clamping bolt 8, the cable clamp 6 is installed on the inclined cable 1-1 or the suspender 1-2, the cable clamp 6 is clamped and fixed through the clamping bolt 8, the rope clamp 5 is installed on the steel wire rope strand of the steel wire rope net 2, and the rope clamp 5 is connected with the cable clamp 6 through the connecting bolt 7. The rope clamp 5 fixes the steel wire rope strand at the corresponding position of the steel wire rope net 2, the cable clamp 6 is fixed on the cable structure 1, and the rope clamp 5 is connected with the cable clamp 6.

[0051] Embodiment two: the steel wire rope net 2 and the cable structure 1 are connected through the anchor node 4, the anchor node 4 includes a cable clamp 6, a connecting bolt 7 and a steel wire rope pressing sleeve 9, the cable clamp 6 is installed on the inclined cable 1-1 or the suspender 1-2, a plurality of steel wire rope strands of the steel wire rope net 2 are provided with the steel wire rope pressing sleeve 9, the inclined cable 1-1 or the suspender 1-2 is clamped together with the steel wire rope pressing sleeve 9 through the cable clamp 6, and is connected and fixed through the connecting bolt 7. The rope clamp 5 fixes the plurality of steel wire rope strands at the corresponding position of the steel wire rope net 2 through the steel wire rope pressing sleeve 9, and the cable clamp 6 clamps and fixes the steel wire rope pressing sleeve 9 and the cable structure 1 together.

[0052] The working principle and process of the application are as follows: under the action of wind load, vehicle load or seismic load, the cable structure 1 will produce spatial vibration or random spatial vibration, so as to drive the steel wire rope net 2 to deform. At this time, the steel wire rope net 2 inhibits the vibration of the cable structure mainly in two aspects. Firstly, the deformation of the steel wire rope net 2 causes the friction between the steel wires of the steel wire rope and the steel wires to consume energy, achieving a good damping effect. Secondly, the steel wire rope net 2 increases the constraint between the cable structures, improves the overall stiffness, and makes the vibrations between the cable structures coupled with each other, increases the modal mass and damping of the cable structure, and makes the vibrations inhibit each other, which has a good damping effect on the bridge.

[0053] In addition, the present application can adjust the rigidity and damping of the steel wire rope net damping device by increasing or decreasing the number of intermediate nodes 3 and / or anchor nodes 4, thereby achieving the desired damping effect.

[0054] The above is a further detailed description of the present application in combination with the specific embodiments, and should not be considered as limiting the specific embodiments of the present application. For those skilled in the art, various simple substitutions, improvements and changes can be made without departing from the concept of the present application, and all such simple substitutions, improvements and changes should be considered as falling within the scope of protection of the present application.

Claims

1. A cable-structured steel wire rope mesh damping vibration reduction device, characterized in that: The wire rope mesh damping vibration reduction device includes a wire rope mesh (2), intermediate nodes (3) and anchor nodes (4). The wire rope mesh (2) is a mesh structure formed by one or more wire ropes interwoven and connected. The wire rope mesh (2) is fixedly installed on multiple cable structures (1) located on the same side of the bridge. Multiple wire ropes at the intersection of the wire rope mesh (2) are connected together through intermediate nodes (3). The wire rope mesh (2) and the cable structure (1) are connected through anchor nodes (4). The intermediate nodes (3) and anchor nodes (4) are distributed in a quincunx pattern. The position of the intermediate nodes (3) can move relative to the displacement of the wire rope mesh (2). The position of the anchor nodes (4) is relatively fixed. The anchor nodes (4) can only move as a whole with the swing of the stay cable (1-1) or the suspender (1-2). The intermediate nodes (3) adopt a double sleeve structure or a fixed fastener. The double sleeve structure is two sleeve structures fixed together or an integrated double sleeve structure.

2. The cable-structured steel wire rope mesh damping vibration reduction device according to claim 1, characterized in that: The cable structure (1) includes a stay cable (1-1) and a suspender (1-2). A wire rope net (2) is provided in the middle of the stay cable (1-1) or the suspender (1-2). The wire rope net (2) is connected to two or more stay cables (1-1) or suspenders (1-2).

3. The cable-structured steel wire rope mesh damping vibration reduction device according to claim 1, characterized in that: The anchoring node (4) includes a rope clamp (5), a cable clamp (6), a connecting bolt (7), and a clamping bolt (8). The cable clamp (6) is installed on the stay cable (1-1) or the suspender (1-2). The cable clamp (6) is clamped and fixed by the clamping bolt (8). The rope clamp (5) is installed on the wire rope strands on the wire rope net (2). The rope clamp (5) is connected to the cable clamp (6) by the connecting bolt (7).

4. The cable-structured steel wire rope mesh damping vibration reduction device according to claim 1, characterized in that: The anchoring node (4) includes a cable clamp (6), a connecting bolt (7), and a wire rope sleeve (9). The cable clamp (6) is installed on the stay cable (1-1) or the suspender (1-2). The wire rope sleeve (9) is installed on multiple strands of wire rope on the wire rope net (2). The stay cable (1-1) or the suspender (1-2) and the wire rope sleeve (9) are clamped together by the cable clamp (6) and connected and fixed by the connecting bolt (7).

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