CN115354564A - Composite energy-consuming damper for cable bearing bridge - Google Patents
Composite energy-consuming damper for cable bearing bridge Download PDFInfo
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- CN115354564A CN115354564A CN202210982269.9A CN202210982269A CN115354564A CN 115354564 A CN115354564 A CN 115354564A CN 202210982269 A CN202210982269 A CN 202210982269A CN 115354564 A CN115354564 A CN 115354564A
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- damper
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- main cylinder
- damping medium
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- 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
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- 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
- E01D11/02—Suspension bridges
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Abstract
The invention discloses a composite energy-consumption damper for a cable bearing bridge, and particularly relates to the technical field of vibration reduction devices. A composite energy-consuming damper for a cable bearing bridge comprises a viscous damper and a friction damper for damping the vibration of a beam end in a low-speed motion state; two ends of the viscous damper are respectively connected with the bridge, and the friction damper is sleeved on the outer side of the viscous damper through the connecting clamp; the friction damper comprises a friction plate and a wear-resistant plate, the friction plate is sleeved on the outer wall of the viscous damper, the wear-resistant plate is embedded in the inner wall of the connecting clamp, and when the beam end of the bridge is in a low-speed motion state, the friction plate and the wear-resistant plate move relatively, so that vibration received by the bridge is reduced. This technical scheme connects in parallel friction damper and viscous damper in an organic whole through coupling fixture, has integrated the advantage of two kinds of dampers.
Description
Technical Field
The invention relates to the technical field of vibration reduction devices, in particular to a composite energy-consuming damper for a cable bearing bridge.
Background
The description of the background of the invention pertaining to the related art to which the present invention pertains is given for the sole purpose of illustrating and facilitating an understanding of the summary of the invention and is not to be construed as an admission that the applicant is explicitly aware or inferred as prior art to the filing date of the first filed application for the present invention.
The longitudinal floating system is usually adopted for a large-span suspension bridge, and vehicle running is a daily behavior for the built large-span suspension bridge, and the experience obtained by monitoring the operation of the large-span suspension bridge shows that the vehicle running can cause longitudinal vibration (vehicle-induced vibration) of a beam end, so that the longitudinal movement of the beam end is continuous, namely, the beam end of a main beam of the large-span suspension bridge can uninterruptedly move longitudinally as long as the vehicle runs on the bridge. In addition, the large-span suspension bridge has high flexibility, and the girder end of the large-span bridge can also generate frequent longitudinal movement under the action of pulsating wind. The longitudinal movement of the beam end caused by the running and pulsating wind of the vehicle has the characteristics of lower speed, smaller amplitude and long accumulated displacement, and if the vibration caused by the Liang Duanche of the main beam and the wind-induced vibration cannot be effectively controlled, the service lives of the expansion joint and the sliding support of the bridge can be reduced, so that greater economic loss is brought.
The viscous damper is a speed-related damper, is widely applied to the field of bridge seismic resistance, can effectively control the movement of a main beam of a bridge under the action of an earthquake, provides larger additional damping and reduces structural response. The damping force output by the viscous damper is positively correlated with the speed, the beam end of the large-span bridge has lower moving speed under the action of live load and pulsating wind of a vehicle, the damper has lower moving speed, the output damping force is lower, the vibration attenuation and energy consumption effects are relatively poorer, so that parts such as a sliding support, an expansion joint and the like of the large-span bridge structure are in a low-speed moving state for a long time, the abrasion is serious, and the durability is poor. Based on the above, when the conventional viscous damper restrains low-speed vibration, the effect is generally poor, and the functional requirement of a large-span bridge cannot be well met. Therefore, it is necessary to develop a damper that can satisfy both the requirement of vibration resistance and the requirement of suppressing low-speed vibration.
Disclosure of Invention
The invention aims to provide a composite energy-consuming damper for a cable bearing bridge, which aims to solve the problem that parts of the bridge are easy to wear due to poor damping effect of a damper with a low beam end movement speed of the conventional long-span bridge.
The technical scheme for solving the technical problems is as follows:
a composite energy-consuming damper for a cable bearing bridge comprises a viscous damper and a friction damper for damping the vibration of a beam end in a low-speed motion state; two ends of the viscous damper are respectively connected with the bridge, and the friction damper is sleeved on the outer side of the viscous damper through the connecting clamp; the friction damper comprises a friction plate and a wear-resistant plate, the friction plate is sleeved on the outer side of the viscous damper, the wear-resistant plate is embedded in the inner wall of the connecting clamp, an outer sleeve used for abutting against the connecting clamp is sleeved on the outer side of the friction plate, and when the beam end of the bridge is in a low-speed motion state, the friction plate and the wear-resistant plate move relatively, so that vibration received by the bridge is reduced.
The beneficial effects of adopting the above technical scheme are: the viscous damper is a speed-related vibration damping device, the damping force output at low speed is small, and the damping force output at high speed is large; the friction damper is a displacement-related vibration damping device, and the output damping force is basically constant within a certain speed interval. Aiming at the longitudinal low-speed vibration of the beam end caused by the live load and pulsating wind of daily vehicles, the friction damper outputs relatively large friction force to play a main vibration reduction and energy dissipation role, and the viscous damper outputs relatively small damping force to play an auxiliary vibration reduction and energy dissipation role. Aiming at the longitudinal relative motion of high speed and large amplitude between tower beams caused by earthquake action, the viscous damper outputs relatively large damping force to play the main vibration reduction and energy dissipation functions; the friction force output by the friction damper is basically unchanged, but is smaller than the viscous damping force, and the auxiliary vibration reduction and energy dissipation effects are achieved.
The technical scheme integrates the advantages of the two dampers by connecting the friction damper and the viscous damper in parallel through the connecting clamp, can effectively control the low-speed longitudinal movement of the beam end caused by the live load and the pulsating wind of the vehicle, can control the longitudinal relative movement of high speed and large amplitude between the tower beams caused by the earthquake action, greatly improves the service environment of the expansion joint and the sliding support, prolongs the service life of the expansion joint and the sliding support, and has better economic benefit.
Furthermore, the viscous damper comprises a piston rod, a piston, a connecting sleeve, an end cover and a main cylinder body filled with damping medium; end covers are respectively embedded at two ends of the main cylinder body, one end of the connecting sleeve is communicated with the main cylinder body, and the other end of the connecting sleeve is connected with a first earring; one end of the piston rod extends out of the main cylinder body and is connected with a second lug ring, and the other end of the piston rod extends into the connecting sleeve; the piston is arranged in the main cylinder body and sleeved on the piston rod; the friction plate is sleeved on the outer wall of the main cylinder body.
Furthermore, two ends of the friction plate respectively extend to two ends of the main cylinder body and are provided with limiting rings.
Furthermore, an outer sleeve is arranged at one end of the main cylinder body, which is far away from the connecting sleeve, the outer sleeve is connected with the side wall of the connecting clamp, and the piston rod extends out of the outer sleeve and is connected with the second earring.
The beneficial effects of adopting the above technical scheme are: in the process that the piston reciprocates in the main cylinder body, the damping medium flows rapidly in the cavity, the medium and the piston generate violent friction among the molecules of the damping medium, and the damping medium generates huge throttling damping through the piston. The damping force generated in the flowing process converts the vibration of the bridge into heat consumption through the reciprocating motion of the piston in the damping medium, so that the motion speed of the piston is gradually reduced, and the aim of damping energy consumption is fulfilled. The viscous damper does not change the inherent dynamic characteristic of the structure when in work, only provides additional damping for the structure, and has stable dynamic characteristic and strong energy consumption capability.
Further, the piston divides the main cylinder into a first chamber and a second chamber, a safety valve is embedded in the piston, and two ends of the safety valve are respectively communicated with the first chamber and the second chamber.
Furthermore, the safety valve comprises a valve sleeve, a valve core, a spring and a fixed block, wherein the valve core, the spring and the fixed block are positioned in the valve sleeve; the fixed block is embedded in the damping medium inlet and is communicated with the damping medium channel; one end of the valve core is connected with the fixed block and is provided with a plug used for plugging the fixed block, the other end of the valve core is connected with a spring, and one end, far away from the valve core, of the spring is connected with a damping medium outlet.
The beneficial effects of adopting the above technical scheme are: when the viscous damper is in a normal working condition, the safety valve is in a normally closed state, namely the plug is embedded in the fixed block, and the damping medium cannot flow into the safety valve; when the viscous damper is in accident conditions such as overload, the safety valve is impacted by flowing damping part media, the damping part media flow in from the damping medium inlet, the plug is separated from the fixed block, the spring is compressed, and the damping medium flows out from the damping medium outlet. The safety valve is arranged in the piston, so that the damage caused by the over-limit of the internal pressure of the viscous damper can be prevented, and the structure is simple.
Further, a safety valve which is installed oppositely is embedded in the piston.
Further, the connecting clamp comprises a first half enclosing plate and a second half enclosing plate, wear-resistant pieces are embedded in the inner walls of the first half enclosing plate and the second half enclosing plate, and the first half enclosing plate is closed and embraces the friction pieces through a locking piece and the second half enclosing plate.
The invention has the following beneficial effects:
1. the friction damper and the viscous damper are connected in parallel into a whole through the connecting clamp, the advantages of the two dampers are integrated, the low-speed longitudinal movement of the beam end caused by live load and pulsating wind of a vehicle can be effectively controlled, the longitudinal relative movement of high speed and large amplitude between the tower beams caused by earthquake action can be controlled, the service environments of the expansion joint and the sliding support are greatly improved, the service life of the expansion joint and the sliding support is prolonged, and the expansion joint and the sliding support have better economic benefits.
2. The invention converts the reciprocating motion of the piston in the damping medium into heat consumption, so that the motion speed of the piston is gradually reduced, thereby achieving the aim of damping energy consumption. The viscous damper does not change the inherent dynamic characteristic of the structure when in work, only provides additional damping for the structure, and has stable dynamic characteristic and strong energy consumption capability.
3. The invention can prevent the damage caused by the over-limit of the internal pressure of the viscous damper by arranging the safety valve in the piston, and has simple structure.
Drawings
Fig. 1 is a schematic structural diagram of the composite energy dissipation type damper for a cable load-bearing bridge of the present invention.
Fig. 2 is a schematic structural view of the viscous damper of the present invention.
Fig. 3 is a schematic structural view of the safety valve of the present invention.
In the figure: 1-a viscous damper; 101-a main cylinder; 102-a piston rod; 103-a piston; 104-a connecting sleeve; 105-an end cap; 106-a first earring; 107-second earring; 108-a stop collar; 2-a friction damper; 201-friction plate; 202-wear resistant sheet; 3-connecting the clamp; 301-a first half wrapper plate; 302-a second half wrapper plate; 4-an outer sleeve; 5-safety valve; 501-valve sleeve; 502-a valve cartridge; 503-a spring; 504-fixed block.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Examples
Referring to fig. 1, a composite energy-consuming damper for a cable load-bearing bridge includes a viscous damper 1 and a friction damper 2 for damping vibration of a beam end in a low-speed motion state; two ends of the viscous damper 1 are respectively connected with the bridge, and the friction damper 2 is sleeved on the outer side of the viscous damper 1 through the connecting clamp 3. The viscous damper 1 is a speed-related vibration damping device, and has small damping force output at low speed and large damping force output at high speed; the friction damper 2 is a displacement-dependent vibration damping device, and the output damping force is substantially constant within a certain speed interval. Aiming at the longitudinal low-speed vibration of the beam end caused by live load and pulsating wind of daily vehicles, the friction damper 2 outputs relatively large friction force to play a main vibration reduction and energy dissipation role, and the viscous damper 1 outputs relatively small damping force to play an auxiliary vibration reduction and energy dissipation role. Aiming at the longitudinal relative motion of high speed and large amplitude between tower beams caused by earthquake action, the viscous damper 1 outputs relatively large damping force to play the main vibration reduction and energy dissipation functions; the friction force output by the friction damper 2 is basically unchanged, but is smaller than the viscous damping force, and the auxiliary vibration reduction and energy dissipation effects are achieved. The friction damper 2 and the viscous damper 1 are connected in parallel into a whole through the connecting clamp 3, the advantages of the two dampers are integrated, the low-speed longitudinal movement of the beam end caused by live load and pulsating wind of a vehicle can be effectively controlled, the longitudinal relative movement of high speed and large amplitude between tower beams caused by earthquake action can be controlled, the service environment of an expansion joint and a sliding support is greatly improved, the service life of the expansion joint and the sliding support is prolonged, and the expansion joint and the sliding support have better economic benefit.
Referring to fig. 1 and 2, the viscous damper 1 includes a main cylinder 101, a piston rod 102, a piston 103, a connecting sleeve 104, and end caps 105 for sealing two ends of the main cylinder 101, wherein the end caps 105 are respectively embedded at two ends of the main cylinder 101, the end caps 105 are provided with sealing members, the sealing members are sealing washers, a certain distance is left between the end cap 105 on the right side (with reference to the figure) and the end of the main cylinder 101 for installing the connecting sleeve 104, one end of the connecting sleeve 104 is embedded in the inner wall of the main cylinder 101, and the other end of the connecting sleeve 104 is provided with a first ear loop 106.
Referring to fig. 1 to 3, the friction damper 2 includes friction plates 201 and wear-resistant plates 202, the friction plates 201 are annular plates and are sleeved on the outer wall of the main cylinder 101, the number of the friction plates 201 is 2,2, the friction plates 201 are respectively attached to the outer wall of the main cylinder 101, two ends of the friction plates 201 respectively extend to two ends of the main cylinder 101 and are provided with limit rings 108, the limit rings 108 are installed at two ends of the main cylinder 101 through threads, and the limit rings 108 can limit the movement of the friction plates 201, so that the friction plates 201 and the main cylinder 101 are relatively fixed. An outer sleeve 4 for supporting the connecting clamp 3 is arranged at one end of the main cylinder 101 far away from the connecting sleeve 104, and the outer sleeve 4 is sleeved on the outer wall of the friction plate 201 and connected with the connecting clamp 3.
The piston 103 is disposed in the main cylinder 101 and divides the main cylinder 101 into a first chamber and a second chamber, both of which are filled with a damping medium. One end of the piston rod 102 extends out of the main cylinder 101 and the outer sleeve 4 in sequence and is connected with a second ear ring 107, the other end of the piston rod 102 passes through the first chamber and the second chamber in sequence and extends into the connecting sleeve 104, and the piston 103 is sleeved on the piston rod 102. When the piston 103 reciprocates in the main cylinder 101, the damping medium flows rapidly in the chamber, and the medium and the piston 103 generate severe friction among the damping medium molecules, so that the damping medium generates huge throttling damping through the piston 103. The vibration of the bridge is converted into heat consumption by the damping force generated in the flowing process through the reciprocating motion of the piston 103 in the damping medium, so that the motion speed of the piston 103 is gradually reduced, and the aim of damping energy consumption is fulfilled. The viscous damper 1 does not change the inherent dynamic characteristic of the structure when working, only provides additional damping for the structure, and has stable dynamic characteristic and strong energy consumption capability.
A safety valve 5 is embedded in the piston 103, and two ends of the safety valve 5 are respectively communicated with the first chamber and the second chamber. The safety valve 5 comprises a valve housing 501, and a valve core 502, a spring 503 and a fixed block 504 which are positioned in the valve housing 501, wherein the valve housing 501 comprises a damping medium inlet and a damping medium outlet, and a damping medium channel is formed between the damping medium inlet and the damping medium outlet. The fixed block 504 is embedded in the damping medium inlet, a through hole used for being communicated with the damping medium channel is formed in the middle of the fixed block 504, a plug used for plugging the fixed block 504 is arranged at one end of the valve core 502, the plug is embedded in the through hole, the other end of the valve core 502 is connected with a spring 503, and one end, far away from the valve core 502, of the spring 503 is connected with the damping medium outlet. 2 safety valves 5,2 are embedded in the piston 103, and the safety valves 5 are oppositely embedded in the piston 103. When the viscous damper 1 is in a normal working condition, the safety valve 5 is in a normally closed state, that is, the plug is embedded in the fixed block 504, and the damping medium cannot flow into the safety valve 5; when the viscous damper 1 is in accident conditions such as overload, the safety valve 5 is impacted by flowing damping part media and flows in from the damping medium inlet, the plug is separated from the fixed block 504, the spring 503 is compressed, and the damping medium flows out from the damping medium outlet. The safety valve 5 is arranged in the piston 103, so that the phenomenon that the internal pressure of the hysteresis damper 1 exceeds the limit to be damaged can be prevented, and the structure is simple.
Connecting jig 3 includes first half bounding wall 301 and second half bounding wall 302, first half bounding wall 301 and second half bounding wall 302 are the C type, and the closed department of first half bounding wall 301 and second half bounding wall 302 is equipped with the flange, connect through the retaining member between the flange, thereby make first half bounding wall 301 and second half bounding wall 302 closed back embrace the outer wall of friction disc 201, the retaining member is the bolt, the retaining member is fixed and is applyed the pretightning force, clamp bolt provides positive pressure for the friction pair that friction disc 201 and wear pad 202 are constituteed. The inner walls of the first half surrounding plate 301 and the second half surrounding plate 302 are provided with embedding grooves for embedding the wear-resistant plate 202, the embedding grooves are used for clamping the wear-resistant plate 202, so that the wear-resistant plate 202 and the connecting clamp 3 are kept relatively fixed, and the friction coefficient between the wear-resistant plate 202 and the connecting clamp is adjusted by adjusting the material type and formula of the wear-resistant plate 202 and the roughness of the outer side of the friction plate 201. The outer sleeve 4 is provided with a flange by which the outer sleeve 4 is connected with a corresponding clamp.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (8)
1. A composite dissipative damper for a cable bearing bridge, comprising: a viscous damper (1) and a friction damper (2) for damping vibration of a beam end in a low-speed motion state;
two ends of the viscous damper (1) are respectively connected with a bridge, and the friction damper (2) is sleeved on the outer side of the viscous damper (1) through a connecting clamp (3);
friction damper (2) are including friction disc (201) and wear pad (202), friction disc (201) cover is established the outside of viscous damper (1), wear pad (202) are inlayed and are established in the inner wall of coupling fixture (3), the outside cover of friction disc (201) is equipped with and is used for supporting outer sleeve (4) of coupling fixture (3), when the beam-ends of bridge is in low-speed motion state, friction disc (201) with wear pad (202) relative motion to reduce the vibration that the bridge received.
2. Composite dissipative damper for cable load-bearing bridges according to claim 1, characterized in that the viscous damper (1) comprises a piston rod (102), a piston (103), a connecting sleeve (104), an end cap (105) and a main cylinder (101) filled with damping medium; the end covers (105) are respectively embedded at two ends of the main cylinder body (101), one end of the connecting sleeve (104) is communicated with the main cylinder body (101), and the other end of the connecting sleeve (104) is connected with a first earring (106); one end of the piston rod (102) extends out of the main cylinder body (101) and is connected with a second lug (107), and the other end of the piston rod (102) extends into the connecting sleeve (104); the piston (103) is arranged in the main cylinder body (101) and sleeved on the piston rod (102); the friction plate (201) is sleeved on the outer wall of the main cylinder body (101).
3. The composite energy dissipation damper for a cable bearing bridge as claimed in claim 2, wherein both ends of the friction plate (201) extend to both ends of the main cylinder (101) respectively and are provided with limit rings (108).
4. Composite dissipative damper for cable carrying bridges according to claim 2, wherein the end of the main cylinder (101) remote from the connecting sleeve (104) is provided with the outer sleeve (4), the outer sleeve (4) being connected to the side wall of the connecting clamp (3), the piston rod (102) extending out of the outer sleeve (4) and being connected to the second ear ring (107).
5. The composite dissipative damper for load-bearing bridges according to claim 2, wherein the piston (103) divides the main cylinder (101) into a first chamber and a second chamber, a safety valve (5) being embedded in the piston (103), the safety valve (5) communicating at both ends with the first chamber and the second chamber respectively.
6. The composite energy consuming damper for a cable load bearing bridge according to claim 5, wherein the safety valve (5) comprises a valve housing (501) and a valve core (502), a spring (503) and a fixed block (504) which are positioned in the valve housing (501), the valve housing (501) comprises a damping medium inlet and a damping medium outlet, and a damping medium channel is formed between the damping medium inlet and the damping medium outlet; the fixed block (504) is embedded in the damping medium inlet and is communicated with the damping medium channel; one end of the valve core (502) is connected with the fixing block (504) and is provided with a plug used for plugging the fixing block (504), the other end of the valve core (502) is connected with the spring (503), and one end, far away from the valve core (502), of the spring (503) is connected with the damping medium outlet.
7. Composite dissipative damper for load-bearing bridges according to claim 6, characterized in that the piston (103) is embedded with safety valves (5) mounted in opposition.
8. Composite dissipative damper for load-bearing bridges according to any of claims 1 to 7, wherein the connecting clamp (3) comprises a first half-enclosing plate (301) and a second half-enclosing plate (302), the inner walls of the first half-enclosing plate (301) and the second half-enclosing plate (302) are embedded with a wear-resistant plate (202), and the first half-enclosing plate (301) is closed with the second half-enclosing plate (302) by a locking piece and embraces the friction plate (201).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210982269.9A CN115354564A (en) | 2022-08-16 | 2022-08-16 | Composite energy-consuming damper for cable bearing bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210982269.9A CN115354564A (en) | 2022-08-16 | 2022-08-16 | Composite energy-consuming damper for cable bearing bridge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115354564A true CN115354564A (en) | 2022-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210982269.9A Pending CN115354564A (en) | 2022-08-16 | 2022-08-16 | Composite energy-consuming damper for cable bearing bridge |
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|---|---|
| CN (1) | CN115354564A (en) |
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2022
- 2022-08-16 CN CN202210982269.9A patent/CN115354564A/en active Pending
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