CN114481830B - Cable isolation vibration damper in cable-stayed-suspension cooperative system - Google Patents
Cable isolation vibration damper in cable-stayed-suspension cooperative system Download PDFInfo
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- CN114481830B CN114481830B CN202210047265.1A CN202210047265A CN114481830B CN 114481830 B CN114481830 B CN 114481830B CN 202210047265 A CN202210047265 A CN 202210047265A CN 114481830 B CN114481830 B CN 114481830B
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- 239000000725 suspension Substances 0.000 title claims abstract description 49
- 238000002955 isolation Methods 0.000 title claims abstract description 15
- 238000013016 damping Methods 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 4
- 238000010276 construction Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/40—Plastics
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The application relates to a cable isolation vibration damper in a cable-stayed and suspension cooperative system, which comprises a first clamp, a second clamp and an elastic connecting piece, wherein the first clamp is arranged on a suspension cable at a crossing position, the second clamp is arranged on a sling at the crossing position, the first clamp and the second clamp are connected through the elastic connecting piece, the elastic connecting piece is movably connected with the first clamp and/or the second clamp, and the elastic connecting piece can axially swing relative to the sling or can also axially slide relative to the suspension cable at the same time. The application plays a role in isolation and vibration reduction between the crossed stay ropes and slings due to the buffer effect of the elastic connecting piece.
Description
Technical Field
The invention relates to a vibration damper, in particular to an isolation vibration damper for stay ropes and slings in a collaborative system bridge.
Background
Both suspension bridges and cable-stayed bridges are structures with cables as the main load bearing members, but there are significant differences between the two. The load acting on the stiffening girder of the cable-stayed bridge is directly transmitted to the stay cable through the anchoring point; the load applied to the stiffening girder of the suspension bridge is transferred to the flexible main cable through the sling anchored on the stiffening girder, and the load is born through the deformation of the main cable, so that the structural rigidity of the two is greatly different. The main cable of the self-anchored suspension bridge is anchored on a huge anchorage, and the stiffening girder does not bear the axial force transmitted by the main cable; while cable-stayed bridges are generally self-anchored structures, the stiffeners of which bear the tremendous axial pressure transmitted by the stay cables. The rigidity of the cable-stayed bridge depends on the rigidity of a cable system to a great extent, so that the internal force born by the stiffening girder can be adjusted and the rigidity of the whole structure can be changed by changing the tension force, the number and the anchoring interval of the stayed cable. However, when the span of the cable-stayed bridge exceeds 1000m, the maximum cantilever can reach or exceed 500m during construction, and the cantilever with the large span can ensure the structural stability of the bridge before closure; meanwhile, the axial horizontal pressure in the stiffening girder can be rapidly increased along with the increase of the span of the cantilever, so that buckling instability phenomenon can be generated at the position of the root of the stiffening girder close to the tower. In order to ensure the buckling stability of the stiffening girder, the cross-sectional area of the stiffening girder must be increased, and this will lead to the increase of the dead weight of the stiffening girder, and the cable force of the stay cable will also increase, and the two affect each other, thereby reducing the efficiency of the stay cable in bearing live loads. Moreover, the pylon height of the cable-stayed bridge (the portion above the deck) is generally 1/6 to 1/4 of its span. When the span is increased, the bridge tower is correspondingly increased, and the high-rise bridge tower can bring about construction difficulties and stability problems. In addition, the larger the length of the stay cable of the large-span cable-stayed bridge is, the more obvious the sag effect is, and the further constraint factor is also used for influencing the development of the cable-stayed bridge to a large span. The main cable of the suspension bridge is mainly subjected to axial force, the section utilization rate is high, and the main cable has larger spanning capacity compared with a cable-stayed bridge.
The maximum span of the suspension bridge is constantly refreshed, but the maximum span also has a limit value. Because when the span of the suspension bridge is further increased, the length of the main cable is obviously increased, the height of the stiffening beam is also increased, the dead weights of the main cable and the stiffening beam are overlarge, and the movable load function is added, so that the requirement of structural stress safety can be met only by building a very large ground anchor. Therefore, the large-span suspension bridge is not very difficult to design, but suitable geological conditions are difficult to find to build a huge ground anchor system, the structural rigidity is obviously reduced along with the span increase of the suspension bridge, and the dynamic stability of the suspension bridge is difficult to ensure when the span is larger. In summary, the bridge with large span in the world currently adopts two forms of cable-stayed bridge and suspension bridge, but both have advantages and disadvantages and restrict the further increase of the span. Particularly, with the development of worldwide economy and traffic industry, in order to develop regional economy, more requirements are required for cross-strait, cross-river and cross-regional traffic connection, and a plurality of large-span bridges need to be built. However, these bridge projects will face the influence of many natural conditions such as deep water foundation, strong typhoon, soft soil foundation, etc., and the conventional single cable-stayed bridge or suspension bridge can not meet the needs of actual projects. Therefore, the cable-stayed and suspension cable cooperative system bridge which can overcome the defects of the cable-stayed bridge and the suspension bridge and combine the advantages of the cable-stayed bridge and the suspension bridge has been developed, so that the development of the bridge in the aspect of super-large span is possible.
In the scheme of the current cable-stayed suspension bridge cooperation system, a suspension cable system is adopted in the middle of a main span part, two ends of a middle span and side spans are cable-stayed parts respectively, and a hanger rod and a stay cable are arranged at the intersection of the suspension cable parts and the cable-stayed parts in a crossing manner. As shown in fig. 1.
Compared with a suspension bridge, the cable-stayed and suspension cable cooperation system has the following advantages: (1) The cable-stayed and suspension cable cooperative system can be flexibly arranged by combining with terrains, and the influence limit of site terrains and geological conditions is small; (2) The load of the cable-stayed bridge part in the cooperative system is transmitted to the bridge tower through the stay cable and then to the foundation, and the load is transmitted to the foundation through two main cables in the suspension bridge, so that the tensile force born by the main cables in the cooperative system can be greatly reduced; (3) The rigidity of the cable-stayed bridge is larger than that of the suspension bridge, so that the mid-span temperature deflection and the live load deflection of the collaborative system bridge are smaller than those of the suspension bridge; (4) Because the cable-stayed bridge has higher wind resistance stability, the first-order torsion frequency of the collaborative system bridge is larger than that of the suspension bridge, and the wind resistance of the collaborative system can be obviously improved. Compared with a cable-stayed bridge, the cable-stayed and suspension cooperation system bridge has the following advantages: (1) Due to the participation of the suspension cable, the middle part of the straddle can save the inclined and overlong stay cable, thereby saving steel, reducing the manufacturing cost and reducing the nonlinear effect influence caused by overlong stay cable; (2) The height of the main tower can be reduced, and the overall anti-seismic, wind-resistant and other capacities of the bridge are improved; (3) The length of the cantilever in the construction process is reduced due to the reduction of the length of the beam of the cable-stayed part, so that the wind resistance stability in the construction process is greatly improved. (4) The cable-stayed bridge part is shortened, so that the axial pressure born by the root of the stiffening girder at the position close to the tower is obviously reduced, and the overall stability of the stiffening girder is improved.
While the cooperative system bridge has numerous advantages over the traditional cable system bridge, this cable-stayed-suspension cooperative system bridge also has the following problems: as the cable-stayed and suspension cable cooperative system bridge is arranged at the junction of the end stay cable and the end suspension rod, the 2-body system rigidity is suddenly changed, the end suspension rod often generates larger axial force amplitude, so that the fatigue problem of the end suspension rod is caused, and researches show that the proper increase of the number of the cross cables in the cable-stayed and suspension cable cross section can lead the transition of the cable-stayed part rigidity and the suspension part rigidity to be more gentle and can effectively improve the fatigue performance of the end suspension rod. The cross arrangement of the stay ropes and the slings can cause the problems that the stay ropes and the slings at the cross positions collide with each other, interfere with each other and the like due to cable vibration and the like in the bridge operation of a cooperative system, and the safety and the durability of the structure are affected. It is therefore necessary to solve the interference problem of the stay and sling at the crossing location.
Disclosure of Invention
In order to solve the interference problem of stay ropes and slings in crossing positions in a cooperative system bridge, the invention provides an isolation vibration damper.
The invention solves the problems by adopting the following technical scheme: the cable isolation vibration damper in the cable-stayed and suspension cooperative system comprises a first clamp, a second clamp and an elastic connecting piece, wherein the first clamp is arranged on a suspension cable at a crossing position, the second clamp is arranged on a sling at the crossing position, the first clamp and the second clamp are connected through the elastic connecting piece, the elastic connecting piece is movably connected with the first clamp and/or the second clamp, and the elastic connecting piece can axially swing relative to the sling or can axially slide relative to the suspension cable at the same time.
As one embodiment of the present application, the second clamp is hinged to a connection end of the elastic connection member, so as to realize the function that the elastic connection member can swing axially relative to the sling.
As one of the embodiments of the application, the first clamp is provided with a moving hole in the direction of a rope, and the other connecting end of the elastic connecting piece is arranged in the moving hole and can slide reciprocally and freely along the moving hole so as to realize that the elastic connecting piece can slide axially relative to the stay rope.
As one of the implementation modes of the application, the elastic connecting piece comprises a bracket, a stretching rod, a spring and a base plate, wherein the bracket is hinged with the second clamp, the stretching rod is movably penetrated on the bracket, the spring is sleeved on the stretching rod, the base plate is locked at one end of the stretching rod positioned in the bracket, one end of the spring is abutted against the base plate, the other end of the spring is abutted against the bracket, and one end of the stretching rod exposed out of the bracket is connected with the first clamp.
As one of the implementation modes of the application, the elastic connecting piece further comprises a rubber pad, the rubber pad is arranged on the support, and the other end of the spring directly abuts against the rubber pad, so that high-frequency solid sound waves received by the spring are reflected and attenuated.
Further, in order to protect the rubber pad, a metal gasket is paved on the surface of the rubber pad, and the other end of the spring directly abuts against the metal gasket.
Further, the first clamp is provided with a moving hole in the direction of a rope, and one end of the stretching rod exposed out of the support is locked in the moving hole through a nut and can slide back and forth freely along the moving hole.
As one of the embodiments of the present application, the first and second clamps include a U-shaped clamping plate and a cover plate, respectively, which is disposed on an opening of the U-shaped clamping plate.
As one of the implementation modes of the application, a rubber gasket with the thickness of 2-3 mm is arranged in the channel after the U-shaped clamping plate and the cover plate are combined, so that the polyethylene sheath on the surface of the stay cable and/or the sling is prevented from being damaged.
Compared with the prior art, the invention has the advantages that:
The elastic connecting piece can be regarded as a spring damper, the axial stiffness of the elastic connecting piece is determined by the compression amount of a spring, and the larger the compression amount of the spring is, the smaller the stiffness of the damper is; the smaller the spring compression, the greater the damper stiffness. There are many non-alternative advantages over other vibration isolation members, such as: the deformation curve has good linearity and accurate design and calculation; the dynamic stiffness is the same as the static stiffness; has three-dimensional rigidity; high elasticity, i.e. high vibration isolation efficiency; no extra power is needed; long service life, basically no maintenance and the like.
One end of the elastic connecting piece is connected with the sling clamp (the second clamp), and the other end of the elastic connecting piece is connected with the stay cable clamp (the first clamp). When the two ends of the spring in the system are displaced, the direction of the spring force is opposite to the positive direction of the established number axis; when the spring is displaced at only one end, the direction of the spring force is opposite to the actual displacement direction of the spring end point. When the stay cable or sling vibrates, a vibration force acts on the spring, and the vibration force can enable the spring to generate acceleration motion on one hand and generate elastic deformation and form solid sound waves on the other hand. Because one end of the spring is a first clamp for fixing the stay cable, the force transmitted to the sling clamp is greatly reduced due to the buffer effect of the spring, and the isolation and vibration reduction effects between the crossed stay cable and the sling are achieved.
Drawings
FIG. 1 is a schematic structural diagram of a cable-stayed, suspension cooperative bridge system;
FIG. 2 is a perspective view of the isolation and vibration damper of the stay cable and sling of the present application;
FIG. 3 is a schematic view of an elastic connector according to an embodiment of the present application;
FIG. 4 is a schematic view of the first clamp/stay cable clamp of the present application;
Fig. 5 is a schematic structural view of a second clamp/sling clamp according to the present application.
Detailed Description
The present invention is described in further detail below with reference to the accompanying drawings, which are exemplary and intended to be illustrative of the invention and not to be construed as limiting the invention. The text description in the embodiment corresponds to the drawings, the description related to the orientation is also based on the drawings, and the description is not to be construed as limiting the protection scope of the invention.
As shown in fig. 1, the cable isolation vibration damper in this embodiment is used for realizing isolation vibration damping between the mutually crossed stay cables and slings in a cable-stayed and suspension cable cooperation system. The device comprises a stay cable clamp, a sling clamp and an elastic connecting piece. The elastic connecting piece comprises a damping spring 1, a stretching rod 2, a stretching rod nut 3, a base plate 4, a rubber pad 5, a bracket 6, a connecting lug plate 7 on the bracket and the like. The connecting lug plate 7 on the bracket 6 is used for being hinged with the sling clamp, and can realize rotation with small rotation angle. The stretching rod 2 is movably penetrated on the support 6, the damping spring 1 is sleeved on the stretching rod 2, the base plate 4 is locked at one end of the stretching rod 2, which is positioned in the support, an axial gap is reserved between the end of the stretching rod 2 and the support 6, the damping spring 1 is also positioned in the support 6, and one end of the damping spring is abutted against the base plate 4 while the other end is indirectly abutted against the support 6 through the rubber pad 5. The rubber pads 5 connected in series make the high-frequency solid sound waves generate reflection attenuation. One end of the stretching rod 2 exposed out of the bracket 6 is connected with the stay cable clamp through a stretching rod nut 3. The stay cable clamp is provided with a waist-shaped moving hole A in the direction of the cable, one end of the stretching rod 2 exposed out of the bracket 6 is locked in the moving hole A through the stretching rod nut 3, and the stay cable clamp can adapt to the movement in the direction of the cable of 200-600 mm.
The stay cable clamp and the sling clamp respectively comprise a U-shaped clamping plate 8 and a cover plate 9, and the cover plate 9 is arranged on the opening of the U-shaped clamping plate 8. A rubber gasket 10 with the thickness of 2-3 mm is arranged in a passage after the U-shaped clamping plate 8 and the cover plate 9 are combined and is used for protecting a polyethylene sheath of a stay cable or a sling.
The elastic connecting piece can be regarded as a high damping spring damper, one end of the elastic connecting piece is connected with the sling clamp, and the other end of the elastic connecting piece is connected with the stay cable connecting clamp. When the two ends of the spring in the system are displaced, the direction of the spring force is opposite to the positive direction of the established number axis; when the spring is displaced at only one end, the direction of the spring force is opposite to the actual displacement direction of the spring end point. When the stay cable or sling is vibrated, a vibration force acts on the elastic connection member, which may cause, on the one hand, an acceleration movement of the spring and, on the other hand, an elastic deformation of the spring and the formation of a solid acoustic wave. Because one end of the elastic connecting piece is fixedly connected with the stay cable upper clamp, the force transmitted to the sling clamp is greatly reduced due to the buffer effect of the spring, and the isolation and vibration reduction effects between the mutually-crossed stay cables and the sling are achieved.
In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions that are formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.
Claims (6)
1. A cable isolation vibration damper in a cable-stayed and suspension cooperative system is characterized in that: the device comprises a first clamp, a second clamp and an elastic connecting piece, wherein the first clamp is arranged on a suspension cable at a crossing position, the second clamp is arranged on a suspension cable at the crossing position, the first clamp and the second clamp are connected through the elastic connecting piece, the elastic connecting piece is movably connected with the first clamp and/or the second clamp, and the elastic connecting piece can axially swing relative to the suspension cable or can axially slide relative to the suspension cable at the same time; the second clamp is hinged with a connecting end of the elastic connecting piece; the first clamp is provided with a moving hole in a rope direction, and the other connecting end of the elastic connecting piece is arranged in the moving hole and slides freely in a reciprocating manner along the moving hole; the elastic connecting piece comprises a support, a stretching rod, a spring and a base plate, wherein the support is hinged with the second clamp, the stretching rod movably penetrates through the support, the spring is sleeved on the stretching rod, the base plate is locked at one end of the stretching rod, which is located inside the support, one end of the spring is abutted to the base plate, the other end of the spring is abutted to the support, and one end of the stretching rod, which is exposed out of the support, is connected with the first clamp.
2. The isolated vibration damping device of claim 1, wherein: the elastic connecting piece further comprises a rubber pad, the rubber pad is arranged on the support, and the other end of the spring directly abuts against the rubber pad.
3. The isolated vibration damping device of claim 2, wherein: a metal gasket is paved on the surface of the rubber pad, and the other end of the spring directly abuts against the metal gasket.
4. The isolated vibration damping device of claim 1, wherein: the first clamp is provided with a moving hole in the direction of a rope, and one end of the stretching rod exposed out of the support is locked in the moving hole through a nut and can slide back and forth freely along the moving hole.
5. The isolated vibration damping device of claim 1, wherein: the first clamp and the second clamp respectively comprise a U-shaped clamping plate and a cover plate, and the cover plate is arranged on the opening of the U-shaped clamping plate.
6. The isolated vibration damping device of claim 5, wherein: and a rubber gasket with the thickness of 2-3 mm is arranged in the passage after the U-shaped clamping plate and the cover plate are combined.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210047265.1A CN114481830B (en) | 2022-01-17 | 2022-01-17 | Cable isolation vibration damper in cable-stayed-suspension cooperative system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210047265.1A CN114481830B (en) | 2022-01-17 | 2022-01-17 | Cable isolation vibration damper in cable-stayed-suspension cooperative system |
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| CN114481830A CN114481830A (en) | 2022-05-13 |
| CN114481830B true CN114481830B (en) | 2024-06-25 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032504A (en) * | 2013-01-11 | 2013-04-10 | 中铁大桥局集团武汉桥梁科学研究院有限公司 | Inverted double-out-rod stay cable oil damper based on thin-wall small hole throttling |
| CN109989345A (en) * | 2019-03-26 | 2019-07-09 | 江苏法尔胜缆索有限公司 | A kind of dynamic mount of bridge sling |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3159682B2 (en) * | 1999-04-12 | 2001-04-23 | 東京フアブリック工業株式会社 | Horizontal force distribution device with anchor bar |
| CN109853370B (en) * | 2019-01-25 | 2020-07-03 | 石家庄铁道大学 | Negative stiffness seismic isolation and reduction device for continuous beam |
| CN211079878U (en) * | 2019-08-23 | 2020-07-24 | 中铁第四勘察设计院集团有限公司 | Suspension bridge structure |
| CN211522885U (en) * | 2019-12-30 | 2020-09-18 | 中国铁建投资集团有限公司 | Temporary stay cable vibration damper for self-anchored suspension bridge |
| CN111236038B (en) * | 2020-03-09 | 2021-04-16 | 东南大学 | Novel suspension bridge central authorities detain device |
| CN113445412B (en) * | 2021-07-26 | 2022-05-13 | 中铁桥研科技有限公司 | Vibration damper for controlling vortex-induced vibration of girder of large-span bridge |
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2022
- 2022-01-17 CN CN202210047265.1A patent/CN114481830B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032504A (en) * | 2013-01-11 | 2013-04-10 | 中铁大桥局集团武汉桥梁科学研究院有限公司 | Inverted double-out-rod stay cable oil damper based on thin-wall small hole throttling |
| CN109989345A (en) * | 2019-03-26 | 2019-07-09 | 江苏法尔胜缆索有限公司 | A kind of dynamic mount of bridge sling |
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| CN114481830A (en) | 2022-05-13 |
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