CN114016396B - Combined supporting structure for transverse earthquake resistance of three-span bridge - Google Patents
Combined supporting structure for transverse earthquake resistance of three-span bridge Download PDFInfo
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- CN114016396B CN114016396B CN202111448788.9A CN202111448788A CN114016396B CN 114016396 B CN114016396 B CN 114016396B CN 202111448788 A CN202111448788 A CN 202111448788A CN 114016396 B CN114016396 B CN 114016396B
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- bridge
- pier
- damper
- groove
- oil cylinder
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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
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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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
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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
- E01D19/041—Elastomeric bearings
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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
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
- E04H9/0235—Anti-seismic devices with hydraulic or pneumatic damping
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
- E04H9/0237—Structural braces with damping devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
The invention discloses a combined support structure for transverse earthquake resistance of a three-span bridge, which comprises a bridge pier, a placing groove, side protection piers and a trapezoid shock absorption groove, wherein the trapezoid shock absorption groove is arranged at the top of the bridge pier, the placing groove is arranged at the top of the trapezoid shock absorption groove, a bridge plate is arranged on the upper end surface of the placing groove, the side protection piers are arranged at the two sides of the bridge pier, a transverse shock absorption mechanism is arranged at the top of the side protection piers, a shock absorption seat is arranged in the trapezoid shock absorption groove, a trapezoid shock absorption block is arranged at the top of the shock absorption seat, longitudinal shock absorption mechanisms are arranged at the tops of the trapezoid shock absorption blocks at equal intervals, rubber shock absorption supports are arranged at the two sides of the surface of the bridge pier, and a buffer mechanism is connected between the rubber shock absorption supports and the side protection piers.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a combined support structure for transverse earthquake resistance of a three-span bridge.
Background
The bridge is broken by earthquake, so that the bridge generates horizontal and vertical vibration to cause damage and destruction of bridge components and even collapse of the bridge, and the modern bridge design is developed to large span and large flexibility, so that the bridge is greatly destroyed in typhoon weather and earthquake disasters, and the improvement of wind resistance and earthquake resistance of the bridge is particularly important.
But the combined support structure for the transverse earthquake resistance of the three-span bridge is directly reinforced by a plurality of combined structures, so that the combined support structure is compact, and can not have a buffering effect when vibration occurs, so that the earthquake resistance efficiency is reduced, and therefore, the combined support structure for the transverse earthquake resistance of the three-span bridge is improved.
Disclosure of Invention
In order to solve the technical problems, the invention provides the following technical scheme:
the invention relates to a combined supporting structure for transverse earthquake resistance of a three-span bridge, which comprises a bridge pier, a placing groove, side protection piers and trapezoidal damping grooves, wherein the trapezoidal damping grooves are arranged at the top of the bridge pier, the placing groove is arranged at the top of the trapezoidal damping grooves, a bridge plate is arranged on the upper end surface of the placing groove, the side protection piers are arranged at the two sides of the bridge pier, a transverse damping mechanism is arranged at the top of the side protection piers, a damping seat is arranged in the trapezoidal damping groove, trapezoidal damping blocks are arranged at the top of the damping seat, longitudinal damping mechanisms are arranged at the top of the trapezoidal damping blocks at equal intervals, rubber damping supports are arranged at the two sides of the surface of the bridge pier, and a buffer mechanism is arranged between the rubber damping supports and the side protection piers in a connecting mode.
As a preferable technical scheme of the invention, the longitudinal damping mechanism comprises an oil cylinder, an inner oil cylinder is sleeved in the oil cylinder, a cavity is arranged between the oil cylinder and the inner oil cylinder, the cavity is filled with high-concentration damping medium, a valve chamber is arranged at the top of the inner oil cylinder, valve clacks are arranged on inner walls of two sides of the valve chamber through rotating shafts, a reset spring is arranged on one side of the bottom end of the valve clacks through a mounting seat, and one end of the reset spring is connected with the side wall of the valve chamber.
As a preferable technical scheme of the invention, the transverse damping mechanism comprises a mounting plate, a sliding groove is formed in the surface of the mounting plate, a pair of sliding blocks are slidably mounted in the sliding groove, pin bases are symmetrically mounted on the surfaces of the sliding blocks, dampers are mounted on the pin bases through shaft pins, and the other ends of the dampers are connected with the bottom ends of bridge plates through bolts.
As a preferable technical scheme of the invention, a hydraulic telescopic rod is arranged between a pair of sliding blocks through a fixing piece, and a restoring spring is arranged at the other side of the pair of sliding blocks.
As a preferable technical scheme of the invention, the side piers and the pier are provided with anti-seismic plates on opposite sides, a pair of buffer blocks are slidably arranged in the anti-seismic plates, and one side of each buffer block is provided with a buffer spring.
As a preferable technical scheme of the invention, the surface of the rubber shock absorption support is provided with a pair of rotating shaft seats, the rotating shaft seats are provided with elastic plastic steel dampers through shaft pins, and one ends of the elastic plastic steel dampers are connected with the buffer blocks through the shaft pins.
As a preferable technical scheme of the invention, the elastic plastic steel damper is any one of C-type and E-type elastic plastic steel dampers.
The beneficial effects of the invention are as follows:
1. this kind of a combination bearing structure for horizontal antidetonation of three bridge, use through reset spring, valve clack, interior hydro-cylinder cooperation high concentration damping medium, thereby realize the vertical shock attenuation effect of bridge antidetonation, avoid when taking place the earthquake, the bridge is whole to receive vertical impact force and take place the skew, the possibility of collapsing, slider, attenuator cooperation hydraulic telescoping rod use, thereby can alleviate the injury that the horizontal impact force that produces caused to the bridge when the earthquake takes place, improve the holistic stability of bridge, the pier takes place the skew when buffer gear's design can prevent the earthquake, the side fender pier plays the effect of supporting the buffering, the holistic stability of guarantee bridge.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is an overall schematic of a modular support structure for lateral seismic protection of a three-bridge girder of the present invention;
FIG. 2 is a schematic view of the internal structure of a trapezoid mounting groove of the combined support structure for transverse earthquake resistance of a three-span bridge;
FIG. 3 is an enlarged schematic view of point B in FIG. 2 of a combined support structure for lateral anti-seismic of a three-span bridge according to the present invention;
FIG. 4 is an enlarged schematic view of point A in FIG. 1 of a combined support structure for lateral anti-seismic of a three-span bridge according to the present invention;
FIG. 5 is a schematic plan view of a cushioning mechanism for a modular support structure for lateral anti-seismic of a three-bridge girder of the present invention.
In the figure: 1. bridge piers; 2. a placement groove; 3. side protection piers; 4. a trapezoid damping groove; 5. a shock absorption seat; 6. an oil cylinder; 7. a mounting plate; 8. rubber shock absorption support; 9. an anti-vibration plate; 601. a chamber; 602. an inner cylinder; 603. a valve chamber; 604. a valve flap; 605. a return spring; 701. a slide block; 702. a hydraulic telescopic rod; 703. a pin base; 704. a damper; 705. a back pressure spring; 901. a buffer block; 902. a buffer spring; 903. a rotating shaft seat; 904. an elastoplastic steel damper.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
Examples: as shown in fig. 1-5, the combined supporting structure for transverse earthquake resistance of a three-span bridge comprises a bridge pier 1, a placing groove 2, side protection piers 3 and trapezoid damping grooves 4, wherein the trapezoid damping grooves 4 are arranged at the top of the bridge pier 1, the placing groove 2 is arranged at the top of the trapezoid damping grooves 4, a bridge plate is arranged on the upper end face of the placing groove 2, the side protection piers 3 are arranged at two sides of the bridge pier 1, transverse damping mechanisms are arranged at the top of the side protection piers 3, damping seats 5 are arranged in the trapezoid damping grooves 4, trapezoid damping blocks are arranged at the top of the damping seats 5, longitudinal damping mechanisms are arranged at the tops of the trapezoid damping blocks at equal intervals, rubber damping supports 8 are arranged at two sides of the surface of the bridge pier 1, and the rubber damping supports 8 are connected with the side protection piers 3.
The longitudinal damping mechanism comprises an oil cylinder 6, an inner oil cylinder 602 is sleeved inside the oil cylinder 6, a chamber 601 is arranged between the oil cylinder 6 and the inner oil cylinder 602, the chamber 601 is filled with high-concentration damping medium, a valve chamber 603 is arranged at the top of the inner oil cylinder 602, valve clacks 604 are arranged on the inner walls of two sides of the valve chamber 603 through rotating shafts, a return spring 605 is arranged on one side of the bottom end of the valve clacks 604 through mounting seats, one end of the return spring 605 is connected with the side wall of the valve chamber 603, and the return spring 605, the valve clacks 604 and the inner oil cylinder 602 are matched with the high-concentration damping medium for use, so that the longitudinal damping effect of bridge shock resistance is achieved, and the possibility that the whole bridge is deflected and collapsed due to longitudinal impact force when an earthquake occurs is avoided.
The transverse shock absorption mechanism comprises a mounting plate 7, a sliding groove is formed in the surface of the mounting plate 7, a pair of sliding blocks 701 are slidably mounted in the sliding groove, pin bases 703 are symmetrically mounted on the surfaces of the sliding blocks 701, dampers 704 are mounted on the pin bases 703 through shaft pins, the other ends of the dampers 704 are connected with the bottom ends of bridge plates through bolts, and the dampers 704 are matched with hydraulic telescopic rods 702 through the sliding blocks 701 and the dampers 702 for use, so that damage to the bridge caused by generated transverse impact force can be relieved when an earthquake occurs. The stability of the whole bridge is improved.
Wherein, a hydraulic telescopic rod 702 is arranged between a pair of the sliding blocks 701 through a fixing piece, and a restoring spring 705 is arranged at the other side of the pair of the sliding blocks 701.
The shock-resistant plate 9 is installed on the opposite surface of the side protection pier 3 and the pier 1, a pair of buffer blocks 901 are slidably installed in the shock-resistant plate 9, a buffer spring 902 is installed on one side of each buffer block 901, and the buffer springs 902 can buffer impact force generated by the buffer blocks 901.
The surface mounting of the rubber shock absorbing support 8 is provided with a pair of rotating shaft seats 903, an elastic plastic steel damper 904 is mounted on the rotating shaft seats 903 through shaft pins, one end of the elastic plastic steel damper 904 is connected with the buffer block 901 through the shaft pins, and the elastic plastic steel damper 904 can buffer the impact force between the side plate pier 4 and the pier 1 to prevent the pier 1 from deviating.
Wherein the elastoplastic steel damper 904 is any one of C-type and E-type elastoplastic steel dampers.
Working principle: when an earthquake happens, transverse and longitudinal shock waves generated by the earthquake source can impact the bridge, when the longitudinal shock waves impact the bridge, the longitudinal shock absorbing mechanism is used by matching the return spring 605, the valve clack 604 and the inner oil cylinder 602 with high-concentration damping media, when the bridge is subjected to longitudinal shock force, the high-concentration damping media flow into the cavity 601 from the inner oil cylinder 602, the longitudinal shock force can be relieved under the influence of the resistance of the valve clack 604 and the return spring 605, so that the longitudinal shock absorbing effect of the bridge is realized, the possibility that the whole bridge is subjected to the longitudinal shock force to deviate and collapse when the earthquake happens is avoided, when the transverse shock waves impact the bridge, the position of the slide block 701 can be reset by the hydraulic telescopic rod 702 through the slide block 701 and the damper 704, the shock force brought by the transverse shock waves can be relieved by the damper 704, and the impact force of the slide block 701 can be buffered, and thus the generated transverse shock force can cause damage to the bridge, the whole stability of the bridge is improved.
Finally, it should be noted that: in the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The utility model provides a combination bearing structure for horizontal antidetonation of three bridge beams, includes pier (1), standing groove (2), side fender pier (3) and trapezoidal damper groove (4), its characterized in that, trapezoidal damper groove (4) are installed at the top of pier (1), standing groove (2) are installed at the top of trapezoidal damper groove (4), just the up end of standing groove (2) is installed the bridge board, the both sides of pier (1) are provided with side fender pier (3), just horizontal damper mechanism is installed at the top of side fender pier (3), trapezoidal damper block is installed at the top of trapezoidal damper groove (4) internally mounted has damper base (5), and longitudinal damper mechanism is installed at trapezoidal damper block top equidistance, rubber damper support (8) are installed at the surface both sides of pier (1), just be connected between rubber damper support (8) and side fender pier (3) and install buffer gear;
the longitudinal damping mechanism comprises an oil cylinder (6), an inner oil cylinder (602) is sleeved in the oil cylinder (6), a cavity (601) is arranged between the oil cylinder (6) and the inner oil cylinder (602), the cavity (601) is filled with high-concentration damping medium, a valve chamber (603) is arranged at the top of the inner oil cylinder (602), valve clacks (604) are arranged on the inner walls of the two sides of the valve chamber (603) through rotating shafts, a return spring (605) is arranged on one side of the bottom end of the valve clacks (604) through a mounting seat, and one end of the return spring (605) is connected with the side wall of the valve chamber (603); when the bridge is subjected to longitudinal impact force, the high-concentration damping medium flows into a cavity (601) from the inner oil cylinder (602);
the transverse damping mechanism comprises a mounting plate (7), a sliding groove is formed in the surface of the mounting plate (7), a pair of sliding blocks (701) are slidably installed in the sliding groove, pin bases (703) are symmetrically installed on the surfaces of the sliding blocks (701), dampers (704) are installed on the pin bases (703) through shaft pins, and the other ends of the dampers (704) are connected with the bottom ends of bridge plates through bolts;
a hydraulic telescopic rod (702) is arranged between the pair of sliding blocks (701) through a fixing piece, and a restoring spring (705) is arranged at the other side of the pair of sliding blocks (701);
the anti-seismic plate (9) is arranged on the opposite surface of the side protection pier (3) to the pier (1), a pair of buffer blocks (901) are slidably arranged in the anti-seismic plate (9), and a buffer spring (902) is arranged on one side of each pair of buffer blocks (901);
the surface of the rubber shock absorption support (8) is provided with a pair of rotating shaft seats (903), the rotating shaft seats (903) are provided with elastic plastic steel dampers (904) through shaft pins, and one ends of the elastic plastic steel dampers (904) are connected with the buffer blocks (901) through the shaft pins.
2. A combined support structure for transverse seismic protection of a three-span bridge according to claim 1, characterized in that said elastoplastic steel damper (904) is any one of C-type and E-type elastoplastic steel dampers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111448788.9A CN114016396B (en) | 2021-11-30 | 2021-11-30 | Combined supporting structure for transverse earthquake resistance of three-span bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111448788.9A CN114016396B (en) | 2021-11-30 | 2021-11-30 | Combined supporting structure for transverse earthquake resistance of three-span bridge |
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| Publication Number | Publication Date |
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| CN114016396A CN114016396A (en) | 2022-02-08 |
| CN114016396B true CN114016396B (en) | 2023-05-12 |
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| CN202111448788.9A Active CN114016396B (en) | 2021-11-30 | 2021-11-30 | Combined supporting structure for transverse earthquake resistance of three-span bridge |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111705628A (en) * | 2020-06-19 | 2020-09-25 | 山西省交通规划勘察设计院有限公司 | Combined supporting structure for transverse earthquake resistance of three-span bridge |
| CN212582403U (en) * | 2020-06-01 | 2021-02-23 | 张书荃 | Damping support for bridge design |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3028051B2 (en) * | 1995-07-12 | 2000-04-04 | 鹿島建設株式会社 | Bridge pier seismic strengthening method |
| JP6787643B2 (en) * | 2015-08-21 | 2020-11-18 | Thk株式会社 | Upper and lower seismic isolation device |
| KR20190072845A (en) * | 2017-12-18 | 2019-06-26 | 유제우 | Isolation device using 'U' shaped fluid pipe |
| CN208884340U (en) * | 2018-10-15 | 2019-05-21 | 兰州工业学院 | A kind of bridge earthquake resistance stabilising arrangement for civil engineering |
| CN109914225B (en) * | 2018-12-19 | 2024-03-26 | 中国电建集团贵阳勘测设计研究院有限公司 | Bridge anti-seismic device |
| CN110158809A (en) * | 2019-05-19 | 2019-08-23 | 北京工业大学 | A kind of vibration damping wall with runback bit function and built-in bidirectional damper particle |
| CN211036673U (en) * | 2019-09-24 | 2020-07-17 | 温晓曦 | Bridge connecting device convenient to disassemble |
| CN211873305U (en) * | 2020-01-13 | 2020-11-06 | 孙秀芬 | Shock attenuation disaster prevention's building engineering structure |
| CN211947929U (en) * | 2020-04-16 | 2020-11-17 | 重庆房地产职业学院 | Bridge damping device |
| CN212612299U (en) * | 2020-05-18 | 2021-02-26 | 浙江大学 | Bridge buffer stop and bridge |
| CN214194084U (en) * | 2020-11-26 | 2021-09-14 | 兰州交通大学 | Wave form steel web combination bridge shock attenuation connection structure |
| CN112482601A (en) * | 2020-12-03 | 2021-03-12 | 商丘工学院 | Civil engineering antidetonation structure |
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2021
- 2021-11-30 CN CN202111448788.9A patent/CN114016396B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212582403U (en) * | 2020-06-01 | 2021-02-23 | 张书荃 | Damping support for bridge design |
| CN111705628A (en) * | 2020-06-19 | 2020-09-25 | 山西省交通规划勘察设计院有限公司 | Combined supporting structure for transverse earthquake resistance of three-span bridge |
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