CN209989690U - Large-span bridge composite type multi-direction wind-resistant anti-seismic shock absorber - Google Patents
Large-span bridge composite type multi-direction wind-resistant anti-seismic shock absorber Download PDFInfo
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- CN209989690U CN209989690U CN201920182440.1U CN201920182440U CN209989690U CN 209989690 U CN209989690 U CN 209989690U CN 201920182440 U CN201920182440 U CN 201920182440U CN 209989690 U CN209989690 U CN 209989690U
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- 238000006073 displacement reaction Methods 0.000 description 11
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- 238000009434 installation Methods 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
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Abstract
The utility model discloses a compound multi-direction anti-wind antidetonation shock absorber of long span bridge, include: the device comprises a tubular shell, a piston plate and a steel shaft, wherein the tubular shell is internally provided with the steel shaft with the length larger than that of the tubular shell, one end of the steel shaft extends out of the end part of the tubular shell, and the other end of the steel shaft is provided with the piston plate clamped in the tubular shell; one end of the tubular shell is of a closed structure, and the end part of the closed structure is provided with a universal hinge for connecting with a pier; the other end of the tubular shell is provided with a cover plate, and the center of the cover plate is provided with a hole for the steel shaft to pass through; at least three sections of damping cavities are arranged in the tubular shell along the axial direction of the tubular shell, namely a first damping cavity between the closed structure of the tubular shell and the piston plate, a second damping cavity between the piston plate and the annular partition plate and a third damping cavity between the annular partition plate and the cover plate. The utility model discloses the device all has obvious power consumption effect to the vibration of high, low frequency and big, little amplitude that the bridge takes place to adopt the assembled connection, be convenient for dismouting and maintenance.
Description
Technical Field
The utility model relates to a mainly relate to the attenuator field, refer in particular to a long-span bridge compound multi-direction anti-wind antidetonation shock absorber, the device can play fine inhibitory action to the harmful vibration of long-span bridge girder, including wind vibration excitation, vehicle load, pedestrian vibration, temperature flexible, earthquake excitation etc..
Background
The span of a bridge structure becomes larger and larger along with the development of times, the service environment is more rigorous, and the common loads such as pedestrian crossing, vehicle running, vehicle braking, wind and rain excitation and the like, or accidental loads such as hurricane, earthquake and the like often cause the main beam to vibrate along the bridge direction and cause a series of engineering problems, such as overlarge longitudinal swing of the main beam, overlarge bending moment of the bottom of a tower pier, even inclination of a tower column, falling of the main beam and the like. The additional arrangement of the energy dissipation shock absorber on the bridge structure is an effective vibration suppression method, and the energy dissipation shock absorber is mainly divided into a displacement-related shock absorber and a speed-related shock absorber according to different working principles. The damping force of the displacement-related shock absorber is mainly influenced by the vibration displacement amplitude, the shock absorber begins to consume vibration energy to work after breaking through the elastic limit, metal or friction shock absorbers are common, but the shock absorber has poor vibration damping effect on certain small displacement amplitudes and high frequencies; the damping force of the speed-dependent damper is mainly influenced by the vibration speed, and the speed-dependent damper can dissipate energy when vibrating at a small amplitude, but the performance is often influenced by the working temperature, and the problems of leakage or damage of damping materials and the like are easy to occur under long-term excitation. And the limit mode that present shock absorber adopted often exceeds and sets for displacement after the shock absorber locks suddenly, and this kind of hard limit mode often can produce the impact to bridge superstructure. Finally, the existing bridge damper has the problems of leakage, fatigue damage and the like, is short in service life and not easy to disassemble and maintain, and if the damper is damaged, the damper is usually required to be integrally replaced, so that the use cost is increased, and the large-range application of the damper in the field of bridges is limited.
SUMMERY OF THE UTILITY MODEL
Problem to prior art existence, the utility model provides a compound multi-direction anti-wind antidetonation shock absorber of long-span bridge, the device all have obvious power consumption effect to the vibration of high, low frequency and big, the little amplitude that the bridge takes place, full play damping material's power consumption ability to adopt the assembled to connect, be convenient for dismouting and maintenance.
In order to realize the technical purpose, the utility model adopts the following technical scheme: the utility model provides a compound multi-direction anti-wind antidetonation shock absorber of long span bridge, installs between pier and the long span bridge girder, includes: the device comprises a tubular shell, a piston plate and a steel shaft, wherein the tubular shell is internally provided with the steel shaft with the length larger than that of the tubular shell, one end of the steel shaft extends out of the end part of the tubular shell, and the other end of the steel shaft is provided with the piston plate clamped in the tubular shell; one end of the tubular shell is of a closed structure, and the end part of the closed structure is provided with a hinge piece for connecting with a pier; the other end of the tubular shell is provided with a cover plate, and the center of the cover plate is provided with a hole for the steel shaft to pass through;
at least three sections of damping cavities are arranged in the tubular shell along the axial direction of the tubular shell, namely a first damping cavity between the closed structure of the tubular shell and the piston plate, a second damping cavity between the piston plate and the annular partition plate and a third damping cavity between the annular partition plate and the cover plate,
the first damping cavity is cylindrical, and a cylindrical viscoelastic energy consumption unit with the diameter smaller than the inner diameter of the first damping cavity is arranged along the axis of the cylindrical first damping cavity;
the second damping cavity is annular, an annular viscoelastic energy consumption unit is arranged in the annular second damping cavity, the outer diameter of the annular viscoelastic energy consumption unit is smaller than the inner diameter of the second damping cavity, and the inner diameter of the annular viscoelastic energy consumption unit is larger than the outer diameter of the steel shaft;
the third damping cavity is in a shuttle shape with two narrow ends and a large middle part, the shuttle-shaped third damping cavity is filled with high-ductility energy dissipation units, the part of the steel shaft, which is positioned in the third damping cavity, is provided with an ellipsoidal bulge, and the geometric center of the ellipsoidal bulge coincides with the geometric center of the third damping cavity.
The diameters of the small openings at the two ends of the third damping cavity are smaller than the diameter of the cross section of the ellipsoidal protrusion.
The tubular shell comprises a plurality of cylinder barrels which are axially connected in series, the end parts of every two cylinder barrels are connected through flanges, a first damping cavity and a second damping cavity are formed in at least one cylinder barrel, and a third damping cavity is formed in at least one cylinder barrel.
And the steel shaft is in threaded connection with the piston plate.
And a material filling hole is formed in the wall of one side of the third damping cavity.
The high-ductility energy consumption unit is one of metal lead, asphalt, high-grade silicone oil or polyurethane.
Has the advantages that:
first, the utility model discloses a long-span bridge compound multi-direction anti-wind antidetonation shock absorber's high ductility power consumption unit and viscoelasticity power consumption unit how with collaborative work. The inner wall of the third damping cavity adopts the variable cross-section inner wall design, and the closer the ellipsoidal projection on the steel shaft is to the end part, the larger the damping force is, so that the vibration energy of the vibration absorber is dissipated mainly through the viscoelastic energy dissipation units in the first damping cavity and the second damping cavity under the excitation of small-displacement vibration such as wind vibration, vehicle excitation, pedestrian load and the like; under the excitation of large-displacement vibration such as earthquake and external impact, the vibration absorber dissipates vibration energy through the viscoelastic energy dissipation unit and the high-ductility energy dissipation unit. The characteristic of cooperative work of the energy consumption units enables the vibration absorber to have the vibration capacity of reducing different frequencies and different excitation amplitudes, can reduce vibration reaction caused by wind vibration excitation, vehicle load, pedestrian vibration, temperature expansion and contraction, earthquake excitation and the like, simultaneously reduces the working load of a damping material, prolongs the service life of the damping material and reduces the use cost of the vibration absorber.
Second, the utility model discloses a compound multi-direction anti-wind antidetonation shock absorber of long-span bridge adopts flexible spacing design. The inner wall of the third damping cavity is designed to be a variable cross-section inner wall, the larger the damping force is when the ellipsoidal protrusion on the steel shaft is closer to the end part, and secondly, when the piston plate is close to the closed structure of the first damping cavity, the cylindrical viscoelastic energy dissipation unit or the annular viscoelastic energy dissipation unit can generate overlarge expansion due to compression and contact with the inner wall of the cylinder barrel, at the moment, the viscoelastic energy dissipation unit is in a three-dimensional compression state, the damping force is greatly increased, and in sum, the high-ductility energy dissipation unit and the viscoelastic energy dissipation unit provide smaller damping force under the condition of small vibration.
Third, the utility model discloses a compound multi-direction anti-wind antidetonation shock absorber of long-span bridge has higher temperature adaptability. The device comprises the high-ductility damping energy dissipation unit insensitive to temperature, so that stable damping force can be provided at different temperatures, and the high-ductility energy dissipation unit plays a main energy dissipation role particularly when the performance of a viscoelastic material in the viscoelastic damping unit is degraded at higher temperatures of the shock absorber caused by seasons or other factors.
Fourth, the utility model discloses a compound multi-direction anti-wind antidetonation shock absorber of long-span bridge has the characteristics that it is convenient, the maintenance is simple to change spare part. Because the right cylinder barrel and the left cylinder barrel are connected through the bolts, and the piston plate and the steel shaft are connected through the bolts, the solid viscoelastic pad, the perforated viscoelastic pad and the lead damping unit in the shock absorber can be replaced independently, and the damaged damping material in the shock absorber can be replaced at different time intervals conveniently.
Fifth, the utility model discloses a compound multi-direction anti-wind antidetonation shock absorber of long-span bridge has can not take place to leak, long service life, low in cost's characteristics. Because the high-ductility energy dissipation unit and the viscoelastic energy dissipation unit are adopted, the two energy dissipation units are semisolid or solid, leakage cannot occur, and the manufacturing cost is low, so that the service life of the shock absorber is greatly prolonged, and the manufacturing cost of the shock absorber is reduced.
Sixth, the utility model discloses a compound multi-direction anti-wind antidetonation shock absorber of long-span bridge has the characteristics that reduce multi-direction vibration. Because the left end connector adopts two unidirectional hinges to be vertically connected, the vibration absorber can reduce the multidirectional vibration of the bridge structure.
Drawings
Fig. 1 is a front view of the structure of the present invention;
fig. 2 is a cross-sectional view of the present invention;
wherein, 1, a steel shaft; 2. a right cylinder barrel; 3. a left cylinder barrel; 4. an ellipsoidal projection; 5. a piston plate; 6.1, filling material holes; 6.2, a bolt cover plate; 7. metallic lead; 8. a cylindrical viscoelastic energy dissipating unit; 9. an annular viscoelastic energy dissipating unit; 10. unidirectional reaming is carried out; 11. a cylinder barrel cover plate; 12. and (4) a flange.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the drawings and specific embodiments.
Examples
As shown in fig. 2, a composite multi-directional wind-resistant and shock-resistant vibration absorber for a long-span bridge and a working method thereof comprise:
from right side to left side is steel axle 1, right cylinder 2, high ductility power consumption unit 7, left cylinder 3, cylindrical viscoelastic power consumption unit 8, annular viscoelastic power consumption unit 8, two one-way hinges 10 in proper order, and wherein, steel axle 1 runs through right cylinder 2 and then stretches into left cylinder 3, has seted up the fusiformis chamber in the right cylinder 2, and it has high ductility power consumption unit 7 to fill in the fusiformis chamber, and 2 left ends in the left cylinder set up two one-way hinges 10, and the bolt of two one-way hinges 10 is placed perpendicularly mutually and is formed universal hinge.
The central axes of the steel shaft 1, the right cylinder barrel 2 and the left cylinder barrel 3 are collinear, an ellipsoidal bulge 4 is arranged in the steel shaft 1, and the end part of the steel shaft 1 extending into the left cylinder barrel 2 is connected with a piston plate 5;
the geometric center of the ellipsoidal projection 4 is coincided with the geometric center of the right cylinder barrel 2, and the geometric center of the piston plate 5 is coincided with the geometric center of the left cylinder barrel 2;
the wall thickness of the right cylinder barrel 2 is linearly increased from the middle to two ends, and a cavity formed between the right cylinder barrel 2 and the steel shaft 1 is filled with high-ductility energy-consuming units;
a cylindrical viscoelastic energy consumption unit 8 and an annular viscoelastic energy consumption unit 9 are placed in the left cylinder barrel 3 and are respectively positioned on two sides of the piston plate 5, the steel shaft 1 completely penetrates through the annular viscoelastic energy consumption unit 9, the ratio of the cross sectional areas of the cylindrical viscoelastic energy consumption unit 8 and the annular viscoelastic energy consumption unit 9 is determined according to a pressure equivalence principle, the distance between a viscoelastic material and the inner wall of the left cylinder barrel 2 needs to be ensured to be free to expand when compressed by small displacement, and the viscoelastic material is restrained by the inner wall of the left cylinder barrel 2 when compressed by large displacement.
The dimensions of the ellipsoidal protrusions 4 are such that the additional stiffness and additional damping provided by the high ductility dissipative unit is 1/4 ~ 3/4 which is the total stiffness and damping of the shock absorber for the anti-seismic design.
The inclined angle of the inner wall of the right cylinder barrel 2 needs to ensure that the diameter of a small opening at two ends of the shuttle-shaped cavity is slightly smaller than the diameter of the cross section of the ellipsoidal bulge.
The size of the viscoelastic material is comprehensively determined according to the size of the ellipsoidal protrusion 4 on the steel shaft 1, the size of the shuttle-shaped cavity of the right cylinder barrel 2 and the type of the filled material, and the additional damping ratio and the additional rigidity of the viscoelastic energy consumption unit and the high-ductility energy consumption unit are ensured to be coordinated with each other.
And the right cylinder barrel 2 is connected with the left cylinder barrel 1 through a flange cover plate bolt.
And circular holes are formed in the middles of the flange cover plate 12 and the cylinder cover plate 11, and the sizes of the circular holes are matched with the diameter of the steel shaft.
And the steel shaft 1 and the piston plate 5 are in threaded connection.
The middle part of the outer wall of the right cylinder barrel 2 is provided with a material filling hole 6.1 and a bolt cover plate 6.2.
As the utility model discloses a technical scheme's a preferred embodiment, 3 left ends on left side cylinder set up two one-way hinges 10, and the hinge bolt of two one-way hinges 10 is placed perpendicularly mutually.
As a preferred embodiment of the technical solution of the present invention, the high-ductility energy dissipation unit may adopt metallic lead, but may also use asphalt, high-grade silicone oil, or polyurethane.
During assembly, the steel shaft 1 firstly penetrates through the right cylinder barrel 2, the geometric center of the ellipsoidal boss 4 is overlapped with the geometric center of the right cylinder barrel 2, and then the cylinder barrel cover plate 11 and the flange cover plate 12 are arranged at the two ends of the right cylinder barrel 2, so that the primary installation of the lead extrusion damping unit is completed.
Secondly, the extending end of the steel shaft 1 penetrates through the annular viscoelastic energy consumption unit 9, the steel shaft 1 is connected with the piston plate 5 through threads, the cylindrical viscoelastic energy consumption unit 8 is placed in the left cylinder barrel 3, and then the left cylinder barrel 3 is connected with the right cylinder barrel 2 through bolts, so that the viscoelastic energy consumption unit is installed.
And finally, pouring metal lead into the right cylinder barrel 2 through the material pouring hole 6.1, and plugging the material pouring hole by using the bolt cover plate 6.2 after the material pouring hole is filled, so that the installation of the long-span bridge composite type multidirectional wind-resistant anti-seismic vibration damper and the working method thereof is completed.
The utility model discloses a based on long-span bridge compound multi-direction anti-wind antidetonation shock absorber's working method be:
the right end of the steel shaft 1 and the one-way hinge 10 are respectively connected to a main beam (box girder) and a pier of the large-span bridge structure, so that the steel shaft 1, the right cylinder barrel 2 and the left cylinder barrel 3 move relatively; when the relative motion between the pier and the main beam (box girder) is caused by the vibration, the ellipsoidal bump 5 in the steel shaft 1 makes a left-right reciprocating linear motion relative to the metal lead 7 in the right cylinder barrel, and the metal lead 7 continuously yields under the continuous extrusion of the ellipsoidal bump 4 and the right cylinder barrel 2 to enter the plastic absorption vibration energy; meanwhile, as the piston plate 5 moves relative to the left cylinder 3, the cylindrical viscoelastic energy consumption unit 8 and the annular viscoelastic energy consumption unit 9 in the left cylinder 3 are subjected to reciprocating extrusion deformation to dissipate vibration energy.
Under the excitation of small-displacement vibration such as wind vibration, vehicle excitation, pedestrian load and the like, because the gap between the inner wall of the right cylinder barrel 2 and the ellipsoidal bulge 4 is large, the damping force generated by the right cylinder barrel 2 is small, and the vibration energy is dissipated by the vibration absorber mainly through the viscoelastic energy dissipation unit in the left cylinder barrel 3; under the excitation of large-displacement vibration such as earthquake, external impact and the like, because the gap between the inner wall of the right cylinder barrel 2 and the ellipsoidal bulge 4 is reduced, the damping force generated by the right cylinder barrel part is larger, and the vibration energy is dissipated by the vibration absorber through the viscoelastic energy dissipation unit in the left cylinder barrel 3 and the high-ductility energy dissipation unit in the right cylinder barrel 2; when the temperature of the shock absorber is higher due to seasons or other factors, the performance of the viscoelastic material in the viscoelastic damping unit is weakened, and the high-ductility energy consumption unit plays a main energy consumption role;
the inner wall of the right cylinder barrel 2 adopts the variable cross-section inner wall design, the closer the ellipsoidal bulge 4 on the steel shaft is to the end part, the larger the damping force is, secondly, when the piston plate 5 approaches the end of the left cylinder 3, the cylindrical viscoelastic energy dissipation unit 8 or the annular viscoelastic energy dissipation unit 9 is excessively expanded due to compression, the viscoelastic material is in contact with the inner wall of the cylinder, the viscoelastic material is in a three-way compressed state at the moment, the damping force is greatly increased, in conclusion, the high-ductility energy dissipation unit and the viscoelastic energy dissipation unit provide smaller damping force under the condition of small vibration and provide larger damping force under the condition of large vibration, namely, the shock absorber obtains larger damping force and rigidity before the limiter works, plays a role of buffering, the flexible limit design avoids the damage of the bridge structure caused by impact due to hard collision among elements in the shock absorber;
furthermore, because the left and right cylinder barrels are connected by the flange 12 and the bolt, the left and right cylinder barrels can be respectively maintained or replaced, and the whole shock absorber does not need to be maintained or replaced at the same time.
Because the high-ductility energy dissipation unit and the viscoelastic energy dissipation unit are adopted, the two energy dissipation units are semisolid or solid, leakage cannot occur, and the manufacturing cost is low, so that the service life of the shock absorber is greatly prolonged, and the manufacturing cost of the shock absorber is reduced.
Because the left end connector adopts two unidirectional hinges 10 to be vertically connected, the vibration damper can reduce multidirectional vibration of a bridge structure.
It should be understood that the above examples are only for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And such obvious changes and modifications which fall within the spirit of the invention are deemed to be covered by the scope of the invention.
Claims (6)
1. The utility model provides a compound multi-direction anti-wind antidetonation shock absorber of long span bridge, installs between pier and the long span bridge girder, its characterized in that includes: the device comprises a tubular shell, a piston plate and a steel shaft, wherein the tubular shell is internally provided with the steel shaft with the length larger than that of the tubular shell, one end of the steel shaft extends out of the end part of the tubular shell, and the other end of the steel shaft is provided with the piston plate clamped in the tubular shell; one end of the tubular shell is of a closed structure, and the end part of the closed structure is provided with a universal hinge for connecting with a pier; the other end of the tubular shell is provided with a cover plate, and the center of the cover plate is provided with a hole for the steel shaft to pass through;
at least three sections of damping cavities are arranged in the tubular shell along the axial direction of the tubular shell, namely a first damping cavity between the closed structure of the tubular shell and the piston plate, a second damping cavity between the piston plate and the annular partition plate and a third damping cavity between the annular partition plate and the cover plate,
the first damping cavity is cylindrical, and a cylindrical viscoelastic energy consumption unit with the diameter smaller than the inner diameter of the first damping cavity is arranged along the axis of the cylindrical first damping cavity;
the second damping cavity is annular, an annular viscoelastic energy consumption unit is arranged in the annular second damping cavity, the outer diameter of the annular viscoelastic energy consumption unit is smaller than the inner diameter of the second damping cavity, and the inner diameter of the annular viscoelastic energy consumption unit is larger than the outer diameter of the steel shaft;
the third damping cavity is in a shuttle shape with two narrow ends and a large middle part, the shuttle-shaped third damping cavity is filled with high-ductility energy dissipation units, the part of the steel shaft, which is positioned in the third damping cavity, is provided with an ellipsoidal bulge, and the geometric center of the ellipsoidal bulge coincides with the geometric center of the third damping cavity.
2. The composite multi-directional wind-resistant and shock-resistant vibration absorber for the long-span bridge according to claim 1, wherein the diameters of the small openings at the two ends of the third damping cavity are smaller than the diameter of the cross section of the ellipsoidal boss.
3. The long-span bridge composite type multidirectional wind-resistant anti-seismic shock absorber according to claim 1, wherein the tubular shell comprises a plurality of cylinder barrels which are axially connected in series, the end portions of every two cylinder barrels are connected through a flange, a first damping cavity and a second damping cavity are formed in at least one cylinder barrel, and a third damping cavity is formed in at least one cylinder barrel.
4. The composite multi-directional wind-resistant and earthquake-resistant shock absorber for long-span bridges according to claim 1, wherein the steel shaft and the piston plate are in threaded connection.
5. The composite multi-directional wind-resistant and shock-resistant vibration absorber for the long-span bridge according to claim 1, wherein a material filling hole is formed in a wall of one side of the third damping cavity.
6. The long-span bridge composite type multidirectional wind-resistant anti-seismic shock absorber according to claim 1, wherein the high-ductility energy dissipation unit is one of metal lead, asphalt, high-grade silicone oil or polyurethane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920182440.1U CN209989690U (en) | 2019-02-01 | 2019-02-01 | Large-span bridge composite type multi-direction wind-resistant anti-seismic shock absorber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920182440.1U CN209989690U (en) | 2019-02-01 | 2019-02-01 | Large-span bridge composite type multi-direction wind-resistant anti-seismic shock absorber |
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| CN209989690U true CN209989690U (en) | 2020-01-24 |
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| CN201920182440.1U Withdrawn - After Issue CN209989690U (en) | 2019-02-01 | 2019-02-01 | Large-span bridge composite type multi-direction wind-resistant anti-seismic shock absorber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109750594A (en) * | 2019-02-01 | 2019-05-14 | 东南大学 | The compound multi-direction wind resistance antidetonation damper of Loads of Long-span Bridges and its working method |
-
2019
- 2019-02-01 CN CN201920182440.1U patent/CN209989690U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109750594A (en) * | 2019-02-01 | 2019-05-14 | 东南大学 | The compound multi-direction wind resistance antidetonation damper of Loads of Long-span Bridges and its working method |
| CN109750594B (en) * | 2019-02-01 | 2023-11-10 | 东南大学 | Large-span bridge composite multi-directional wind-resistant and earthquake-resistant damper and working method thereof |
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