CN105586827A - Continuous beam bridge vibration reduction device with inertia force activating function - Google Patents
Continuous beam bridge vibration reduction device with inertia force activating function Download PDFInfo
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- CN105586827A CN105586827A CN201610062046.5A CN201610062046A CN105586827A CN 105586827 A CN105586827 A CN 105586827A CN 201610062046 A CN201610062046 A CN 201610062046A CN 105586827 A CN105586827 A CN 105586827A
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- lock tube
- inertia force
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/04—Bearings; Hinges
- E01D19/048—Bearings being adjustable once installed; Bearings used in incremental launching
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- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention relates to the field of bridge vibration reduction and isolation, in particular to a continuous beam bridge vibration reduction device with the inertia force activating function. The continuous beam bridge vibration reduction device comprises an activating device, a locking device, a horizontal locking rod and corbels. The horizontal locking rod is connected with a beam body through the corbels. The activating device and the locking device are fixed to a movable pier. The horizontal locking rod is arranged in an inner space of the locking device. In the normal state, the clearance in the locking device is larger than the outer diameter of the horizontal locking rod, the horizontal locking rod can freely and horizontally move in the locking device, and the bridge pier position change requirement in the normal state is met. When an earthquake occurs, the activating device swings under the inertia force effect to drive a connecting rod mechanism of the activating device to swing, the inner space of the locking device is activated to be shrunk, the horizontal locking rod is embedded in the inner space, and therefore the relative displacement of the beam body and the movable pier is limited. The continuous beam bridge vibration reduction device is simple in principle, economical, reliable, capable of being used for newly-built continuous beam anti-seismic design and existing continuous beam anti-seismic reinforcement and convenient to apply and popularize.
Description
Technical field
The present invention relates to bridge and subtract shock insulation field, be specifically related to the continuous bridge damping device that a kind of inertia force activates, be applicable to newly-built Aseismic Design and the existing building seismic hardening of highway bridge, railway bridge, Urban Bridge and all kinds of Large Scale and Continuous girder constructions, when earthquake burst, by simple, the economic damping device reliably of principle, reach the object of structure cooperative bearing, improve structural entity anti-seismic performance.
Background technology
The displacement needs that cause for satisfied temperature load, one span continuous beam often only arranges an anchor block, this not only makes the shock resistance of anchor block be difficult to meet earthquake demand, and make the longitudinal earthquake displacement response of continuous bridge larger, very easily cause the destruction of expansion joint and bearing, even cause falling the generation of the serious earthquakes such as beam. For reducing the earthquake of continuous bridge, the devices such as viscous damper, hyperboloid spheroidal bearer of shock absorption and insulation and inhaul cable damping support saddle are developed, although can obtain certain damping effect, bear separately longitudinal earthquake load but do not change continuous bridge anchor block, and the existing antidetonation potential of other movable pier fails to give full play to the state of utilization. Lock-up device is judged locked opportunity taking beam pier speed of related movement as index, can realize in theory each pier cooperative bearing, but it is with high costs, later maintenance is complicated, causes its application less.
Summary of the invention
That the object of the invention is to provide is that a kind of inertia force activates, principle is reliable, simple structure, economy and durability, be convenient to check and the novel large-tonnage continuous bridge damping device of safeguarding, utilize the present invention, can earthquake realize anchor block and each movable pier cooperative bearing when burst, reach the continuous bridge that the solves conventional design anchor block earthquake problems such as stressed, bridge superstructure length travel is excessive separately under longitudinal geological process.
For addressing the above problem, the technical solution used in the present invention is:
The continuous bridge damping device that a kind of inertia force activates, its key technology is: it comprises active device, locking device, horizontal locking bar and bracket, horizontal locking bar is fixedly connected with continuous beam bridge body by bracket, active device and locking device are individually fixed on continuous bridge movable pier, described locking device surrounds inner space, described horizontal locking bar is placed in the inner space of described locking device, and described excitation apparatus is by the inner space of locking device described in linkage control. Under normal condition, the inner headroom of locking device is greater than horizontal locking bar external diameter, and horizontal locking bar can free horizontal movement in locking device, meets normal condition underbeam pier displacement demand. When earthquake burst, the pendulum of active device rotates around center-pole under inertia force effect, drive the corresponding swing of fork being fixedly connected with the active device collar, thereby activate the lock tube of locking device inside, lock tube rotates and causes its inner space to diminish around bearing pin, is mutual build-in state with horizontal locking bar, thus the relative displacement of restraint beam body and movable pier, reach the object that the collaborative anchor block of movable pier bears horizontal earthquake load, thereby improve the anti-seismic performance of continuous bridge.
As preferably, described active device comprises the pillar being fixed on movable pier, pillar upper end is provided with center-pole, the collar can rotate around center-pole, pendulum is consolidated in collar below by connecting rod, and the fork of linkage is consolidated in collar top, and pendulum, connecting rod and fork form entirety by the collar, in the time that earthquake causes pillar with movable pier horizontal movement, pendulum drives fork to rotate around center-pole under inertia force effect. When practical application, by adjusting pendulum weight and the radius of gyration thereof, the activation threshold of active device can be set as required.
As preferably, described locking device comprises fixed head, lock tube and slide block, wherein, slide block is circular, between fixed head and lock tube, so that lock tube and the transmission of fixed head load and reduce the frictional force of lock tube in the time that bearing pin rotates, lock tube entirety is semicolumn housing, it is inner for being teeth shape, locking device needs two lock tubes to be used in conjunction with, fixed head, lock tube and slide block are connected as a single entity by bearing pin, fixed head is consolidated on movable pier, lock tube can rotate around bearing pin, two lock tube belows connect by two struts of linkage, between two struts and strut be hinged with being connected of lock tube, in the time that two strut angles are greater than design load, lock tube inner space is greater than horizontal locking bar external diameter, the required design load of strut angle can be set according to the activation threshold of active device.
As preferably, described horizontal locking bar is cylinder, and outer surface is boss in the form of a ring, and the load that its boss can bear determines according to movable pier maximum load capacity, and annular boss is set as required along the scope that arranges in Horizontal lock pole length direction.
As preferably, the load that the inner single teeth of described lock tube can bear need be greater than the ultimate bearing capacity of the single annular boss of horizontal locking bar, and its teeth quantity can be set as required.
As preferably, described linkage comprises two struts and a fork, and two strut one end are hinged with corresponding lock tube, the other end and fork hinge, and fork is fixedly connected with the collar of active device. When earthquake occurs, pendulum will cause linkage action around the rotation of center-pole under inertia force effect, be that fork swings with the active device collar, cause variable angle between locking device two struts, then causing lock tube rotates around bearing pin, when the movable pier motion causing when earthquake reaches the activation threshold of active device, between two struts, angle will be less than design load, now lock tube inner space is less than horizontal locking bar external diameter, then the relative motion of restraint beam body and movable pier, reach movable pier and anchor block cooperative bearing, improve the object of continuous bridge entirety anti-seismic performance.
The operation principle of described device is:
Normal operation state, the pendulum of active device and the fork of linkage are in vertical state, be the level of state with the strut of the hinged linkage of fork, the inner headroom of locking device is greater than horizontal locking bar external diameter, horizontal locking bar can free horizontal movement in locking device, then meets normal operation state underbeam pier Relative Displacement demand.
Earthquake bursty state, earthquake burst will cause the horizontal movement of movable pier, pendulum and fork swing around center-pole in inertia force effect, the rotation of fork diminishes the strut angle that causes linkage, the lock tube of guiding locking device rotates around bearing pin, when the movable pier motion causing when earthquake reaches the activation threshold of active device, the inner teeth of lock tube will be in the mutual build-in of horizontal locking bar boss, the relative displacement of restraint beam body and movable pier, the earthquake of superstructure vertical equity is passed to movable pier, realizes the object of the each pier cooperative bearing of continuous bridge.
Movable pier guard mode; the core concept of this device is to utilize the antidetonation potential of movable pier; therefore the ultimate bearing capacity a of horizontal locking bar boss need determine according to the maximum load-carrying capacity b of movable pier; desirable a=2b/3; when earthquake excessive; the earthquake load that causes Liang Tisuo to be passed to movable pier reaches a value; horizontal ledge surrender; between beam pier, under being about the state of a value, sustained loading produces relative displacement; like this; the antidetonation potential of movable pier can be brought into play to greatest extent, stressed excessive destruction of movable pier can be avoided again.
Beneficial effect
Good effect of the present invention is: research and develop a kind of inertia force and activate, principle is reliable, simple structure, economy and durability, be convenient to check and the novel large-tonnage continuous bridge damping device of safeguarding, utilize interlock power transmission principle, reach the object of the each pier of continuous bridge cooperative bearing under seismic loading, be applicable to highway bridge, railway bridge, the newly-built Aseismic Design of Urban Bridge and all kinds of Large Scale and Continuous girder constructions and existing building seismic hardening, when earthquake burst, simple by principle, economic damping device reliably, reach the object of structure cooperative bearing, improve structural entity anti-seismic performance.
The present invention has beam body and is connected and movable pier capacity protection function with movable pier in good time, both can in the time that earthquake happens suddenly, bring into play to greatest extent the antidetonation potential of movable pier, can effectively avoid again movable pier stressed excessive and cause structural deterioration.
The present invention has Self-resetting function, after earthquake stops, pendulum is vertical state under Action of Gravity Field, fork with pendulum swing can drivening rod mechanism strut return to initial level state, then the lock tube of locking device is outwards opened, realize the Self-resetting of damping device, do not affect shake axle casing and normally run.
Brief description of the drawings
In order to be illustrated more clearly in the specific embodiment of the invention or technical scheme of the prior art, to the accompanying drawing of required use in detailed description of the invention or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is main TV structure schematic diagram of the present invention.
Fig. 2 is the main TV structure schematic diagram of active device of the present invention.
Fig. 3 is the side-looking structural representation of active device of the present invention.
Fig. 4 is the main TV structure schematic diagram of locking device of the present invention.
Fig. 5 is the sectional structure schematic diagram of locking device of the present invention.
Fig. 6 is the main TV structure schematic diagram under the normal operation state of the present invention.
Fig. 7 is the A-A sectional structure schematic diagram of Fig. 6.
Fig. 8 is the main TV structure schematic diagram under earthquake bursty state of the present invention.
Fig. 9 is the side-looking structural representation under earthquake bursty state of the present invention.
Figure 10 is structural representation under movable pier guard mode of the present invention.
Figure 11 is the local structure for amplifying schematic diagram of A in Figure 10.
Wherein: 1 active device, 1-1 pendulum, 1-2 connecting rod, 1-3 center-pole, the 1-4 collar, 1-5 fork, 1-6 pillar, 2 locking devices, 2-1 fixed head, 2-2 lock tube, 2-3 slide block, 2-4 bearing pin, 2-5 strut, 3 horizontal locking bars, 4 brackets, 5 beam bodies, 6 movable piers.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing 1-11 and specific embodiment, invention is carried out to clear, complete description.
The structure of the present embodiment as Figure 1-5, the continuous bridge damping device that a kind of inertia force activates, it comprises active device 1, locking device 2, horizontal locking bar 3 and bracket 4, horizontal locking bar 3 is fixedly connected with continuous beam bridge body 5 by bracket 4, active device 1 and locking device 2 are individually fixed on the movable pier 6 of continuous bridge, described locking device 2 surrounds inner space, described horizontal locking bar 3 is placed in the inner space of described locking device 2, and described excitation apparatus 1 is by the inner space of locking device 2 described in linkage control.
As shown in Figures 2 and 3, described active device 1 comprises two pillar 1-6 that are fixed on movable pier 6, described in two, pillar 1-6 upper end is provided with center-pole 1-3, center-pole 1-3 crosses between two pillar 1-6, on described center-pole 1-3, be provided with collar 1-4, collar 1-4 can rotate around center-pole 1-3, pendulum 1-1 is consolidated in collar 1-4 below by connecting rod 1-2, the fork 1-5 of linkage is consolidated in collar 1-4 top, pendulum 1-1, connecting rod 1-2 and fork 1-5 form entirety by collar 1-4, in the time that earthquake causes pillar 1-6 with movable pier 6 horizontal movement, pendulum 1-1 drives fork 1-5 to rotate around center-pole 1-3 under inertia force effect. when practical application, by adjusting pendulum 1-1 weight and the radius of gyration thereof, the activation threshold of active device 1 can be set as required.
As shown in Figures 4 and 5, described locking device 2 comprises fixed head 2-1, lock tube 2-2 and slide block 2-3, wherein, slide block 2-3 is circular, between fixed head 2-1 and lock tube 2-2, lock tube 2-2 entirety is semicolumn housing, it is inner for being teeth shape, locking device 2 needs two lock tube 2-2 to be used in conjunction with, fixed head 2-1, lock tube 2-2 and slide block 2-3 are connected as a single entity by bearing pin 2-4, fixed head 2-1 is consolidated on movable pier 6, lock tube 2-2 can rotate around bearing pin 2-4, two lock tube 2-2 belows connect by two strut 2-5 of linkage, two strut 2-5 are hinged with the lock tube 2-2 of respective side respectively, the other end of two strut 2-5 is all hinged with the fork 1-5 upper end of described linkage, in the time that the angle of two strut 2-5 is greater than design load, lock tube 2-2 inner space is greater than the external diameter of horizontal locking bar 3, strut 2-5 angle is greater than design load and can sets according to the activation threshold of active device.
Described two strut 2-5 and a fork 1-5 form the linkage of the inner space of controlling described locking device 2 jointly, described in two, strut 2-5 one end is hinged with corresponding lock tube 2-2, the other end and described fork 1-5 are hinged, described fork 1-5 is fixedly connected with described collar 1-4, the swing of fork 1-5 drives described strut 2-5 interlock, thereby lock tube 2-2 is rotated around bearing pin 2-4.
Described horizontal locking bar 3 is cylinder, its outer surface boss in the form of a ring, and the load that its boss can bear is definite according to the maximum load capacity of movable pier 6, and annular boss is set as required along the scope that arranges on horizontal locking bar 3 length directions. The load that the inner single teeth of lock tube 2-2 can bear need be greater than the ultimate bearing capacity of horizontal locking bar 3 single annular boss, and its teeth quantity can be set as required.
Under normal condition, the inner headroom of locking device 2 is greater than the external diameter of horizontal locking bar 3, and horizontal locking bar 3 can be in the interior free horizontal movement of locking device 2, meets normal condition underbeam pier displacement demand.
When earthquake burst, the pendulum 1-1 of active device 1 rotates around center-pole 1-3 under inertia force effect, drive the corresponding swing of fork 1-5 being fixedly connected with the collar 1-4 of active device 1, thereby activate the lock tube 2-2 of locking device 2 inside, lock tube 2-2 rotates and causes its inner space to diminish around bearing pin 2-4, be mutual build-in state with horizontal locking bar 3, thereby the relative displacement of restraint beam body 5 and movable pier 6, reach the object that the collaborative anchor block of movable pier bears horizontal earthquake load, thereby improve the anti-seismic performance of continuous bridge.
As Figure 6-9, between the fork 1-5 of described active device 1 and the strut 2-5 of locking device 2, be hinged, when causing pendulum 1-1, earthquake under inertia force effect, drive fork 1-5 in the time that center-pole 1-3 rotates, the motion of fork 1-5 will cause variable angle between two strut 2-5 of locking device 2, then causing lock tube 2-2 rotates around bearing pin 2-4, when movable pier 6 motions that cause when earthquake reach the activation threshold of active device 1, between two strut 2-5, angle will be less than design load, now lock tube 2-2 inner space is less than the external diameter of horizontal locking bar 3, then the relative motion of restraint beam body 5 and movable pier 6, reach movable pier 6 and anchor block cooperative bearing, improve the object of continuous bridge entirety anti-seismic performance.
As shown in Fig. 1 and 5, normal operation state, the pendulum 1-1 of active device 1 and the fork 1-5 of linkage are in vertical state, two the linkage strut 2-5s hinged with fork 1-5 are the level of state, the inner headroom of locking device 2 is greater than horizontal locking bar 3 external diameters, horizontal locking bar 3 can be in the interior free horizontal movement of locking device 2, then meets normal operation state underbeam pier Relative Displacement demand.
As shown in Figures 6 and 7, in normal operation state underbeam pier Relative Displacement process, pendulum 1-1 drives fork 1-5 in the time that center-pole 1-3 rotates under inertia force effect, the motion of fork 1-5 will cause variable angle between two strut 2-5 of locking device 2, then causing lock tube 2-2 rotates around bearing pin 2-4, during but normal beam pier phase place changes, movable pier 6 motions do not reach the activation threshold of active device 1, although angle dwindles between two strut 2-5, but be still greater than design load, now lock tube 2-2 inner space is still greater than the external diameter of horizontal locking bar 3, can restraint beam body 5 and the relative motion of movable pier 6.
As shown in FIG. 8 and 9, earthquake bursty state, earthquake burst will cause the horizontal movement of movable pier 6, pendulum 1-1 and fork 1-5 swing around center-pole 1-3 in inertia force effect, the rotation of fork 1-5 diminishes the strut 2-5 angle that causes locking device 2, guiding lock tube 2-2 rotates around bearing pin 2-4, when movable pier 6 motions that cause when earthquake reach the activation threshold of active device, the inner teeth of lock tube 2-2 will be in the mutual build-in of horizontal locking bar 3 boss, the relative displacement of restraint beam body 5 and movable pier 6, the earthquake of superstructure vertical equity is passed to movable pier 6, realize the object of the each pier cooperative bearing of continuous bridge.
As shown in Figure 10 and Figure 11; movable pier 6 guard modes; the core concept of this device is to utilize the antidetonation potential of movable pier 6; therefore the ultimate bearing capacity a of horizontal locking bar boss need determine according to the maximum load-carrying capacity b of movable pier; desirable a=2b/3; when earthquake excessive; cause the earthquake load of beam body 5 movable pier that is passed to 6 to reach a value; horizontal ledge surrender; between beam pier, under being about the state of a value, sustained loading produces relative displacement; like this, the antidetonation potential of movable pier can be brought into play to greatest extent, stressed excessive destruction of movable pier can be avoided again.
As another kind of embodiment, can between horizontal locking bar 3 and bracket 4, install and connect damping energy dissipation device or the Slipper in locking device is set up under the effect of damping energy dissipation device inertia force, when above-mentioned damping device is by after Liang Dun locking, superstructure earthquake load is passed in the process of movable pier can also pass through damping energy dissipation, further improves Seismic Design of Continuous Girder Bridges performance.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record previous embodiment is modified, or part technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of embodiment of the present invention technical scheme.
Claims (6)
1. the continuous bridge damping device that inertia force activates, it is characterized in that: it comprises active device (1), locking device (2), horizontal locking bar (3) and bracket (4), horizontal locking bar (3) is connected with beam body (5) by bracket (4), active device (1) and locking device (2) are individually fixed on movable pier (6), described locking device (2) surrounds inner space, described horizontal locking bar (3) is placed in the inner space of described locking device (2), described excitation apparatus (1) is by the inner space of locking device (2) described in linkage control,
Under normal condition, the inner headroom of described locking device (2) is greater than described horizontal locking bar (3) external diameter, and horizontal locking bar (3) can free horizontal movement in locking device (2), meets normal condition underbeam pier displacement demand;
When earthquake occurs, described active device (1) is at inertia force effect lower swing, then drive the linkage between active device (1) and locking device (2) to swing, cause locking device (2) inner space to be shunk, and with mutually build-in of described horizontal locking bar (3), thereby the relative displacement of restraint beam body (5) and movable pier (6).
2. the continuous bridge damping device that a kind of inertia force according to claim 1 activates, it is characterized in that: described active device (1) comprises two pillars (1-6) that are fixed on movable pier (6), be fixedly installed the center-pole (1-3) between pillar described in two (1-6), be arranged on the collar (1-4) and pendulum (1-1) on described center-pole (1-3), the described collar (1-4) can rotate around center-pole (1-3), described pendulum (1-1) is consolidated in the collar (1-4) below by connecting rod (1-2), the described collar (1-4) is fixedly connected with described linkage, in the time that earthquake causes pillar (1-6) with movable pier (6) horizontal movement, pendulum (1-1) drives the collar (1-4) to rotate around center-pole (1-3) under inertia force effect, the collar (1-4) drives described linkage action.
3. the continuous bridge damping device that a kind of inertia force according to claim 2 activates, it is characterized in that: described locking device (2) comprises two fixed heads (2-1), two lock tubes (2-2) and two slide blocks (2-3), wherein, fixed head described in two (2-1) is fixed on movable pier (6), described lock tube (2-2) entirety is semicolumn housing, lock tube described in two (2-2) top is hinged by the bearing pin (2-4) being fixed between fixed head described in two (2-1), slide block described in two (2-3) is circular and is positioned between fixed head (2-1) and lock tube (2-2), so that lock tube (2-2) and fixed head (2-1) load transmission and reduce the frictional force of lock tube (2-2) in the time that bearing pin (2-4) rotates, lock tube described in being beneficial to two (2-2) rotates around bearing pin (2-4), two lock tubes (2-2) below is connected with the collar (1-4) of described active device (1) by described linkage.
4. the continuous bridge damping device that a kind of inertia force according to claim 3 activates, it is characterized in that: described linkage comprises two struts (2-5) and a fork (1-5), strut described in two (2-5) one end is hinged with corresponding lock tube (2-2), the other end and described fork (1-5) are hinged, and described fork (1-5) is fixedly connected with the described collar (1-4).
5. the continuous bridge damping device that a kind of inertia force according to claim 4 activates, it is characterized in that: hinged between described fork (1-5) and strut (2-5), in the time that two struts (2-5) angle is greater than design load, lock tube (2-2) inner space is greater than horizontal locking bar (3) external diameter, when causing pendulum (1-1), earthquake under inertia force effect, drive fork (1-5) in the time that center-pole (1-3) rotates, the motion of described fork (1-5) will cause lock tube (2-2) to rotate around bearing pin (2-4), when movable pier (6) motion causing when earthquake reaches the activation threshold of active device (1), between strut described in two (2-5), angle will be less than design load, cause lock tube (2-2) inner space to be less than horizontal locking bar (3) external diameter, then the relative motion of restraint beam body (5) and movable pier (6).
6. the continuous bridge damping device activating according to a kind of inertia force described in claim 3-5 any one, it is characterized in that: described horizontal locking bar (3) is cylinder, its outer surface boss in the form of a ring, the load that described annular boss can bear is determined according to movable pier maximum load capacity, lock tube described in two (2-2) inside is teeth shape, and the load that its inner teeth can bear is greater than the bearing capacity of described horizontal locking bar (3).
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| CN201610062046.5A CN105586827B (en) | 2016-01-29 | 2016-01-29 | Continuous beam bridge vibration reduction device with inertia force activating function |
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| CN201610062046.5A CN105586827B (en) | 2016-01-29 | 2016-01-29 | Continuous beam bridge vibration reduction device with inertia force activating function |
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| CN108330820A (en) * | 2018-04-09 | 2018-07-27 | 石家庄铁道大学 | A kind of continuous bridge Self-resetting damping by friction device |
| CN110847017A (en) * | 2019-12-31 | 2020-02-28 | 河南省交通规划设计研究院股份有限公司 | Single-pulley type bridge damping structure |
| CN110894706A (en) * | 2019-12-31 | 2020-03-20 | 河南省交通规划设计研究院股份有限公司 | Pulley type bridge damping structure |
| CN110965458A (en) * | 2019-12-31 | 2020-04-07 | 河南省交通规划设计研究院股份有限公司 | Plane gear type bridge damping structure |
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