CN111519516B - Railway bridge beam end lateral displacement coordination device - Google Patents
Railway bridge beam end lateral displacement coordination device Download PDFInfo
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- CN111519516B CN111519516B CN202010424415.7A CN202010424415A CN111519516B CN 111519516 B CN111519516 B CN 111519516B CN 202010424415 A CN202010424415 A CN 202010424415A CN 111519516 B CN111519516 B CN 111519516B
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- limiting
- seat
- vibration isolation
- tenon
- coordination
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention is suitable for the technical field of bridge construction, and provides a railway bridge beam end transverse displacement coordination device which comprises a limiting assembly and a control assembly, wherein the vibration sensor, a limiting motor and a controller are arranged, the vibration sensor can be used for detecting whether a fixed seat vibrates or not so as to judge whether an earthquake occurs or not, a detection signal is transmitted to the controller, and then the controller controls the limiting motor to work so that a vibration isolation beam and an anti-seismic beam do not have relative dislocation in the vertical direction but can realize relative left and right sliding, under the condition that the earthquake occurs, a limiting steel wire is in a loose state so that the vibration isolation beam and the anti-seismic beam can relatively dislocate in the vertical direction and can relatively slide in the left and right direction, thereby providing a moving space for the vibration isolation beam and the anti-seismic beam during the earthquake, effectively solving the problem that the vibration isolation beam and the anti-seismic beam end need to be jointly displaced under the normal condition, and the contradiction of relative dislocation is needed in the case of earthquake.
Description
Technical Field
The invention belongs to the technical field of bridge construction, and particularly relates to a lateral displacement coordination device for a beam end of a railway bridge.
Background
Two girders of two sides of a pier are different bridge forms, if one side of the girder adopts a large-span steel structure bridge with a large transverse width and the other side of the girder adopts a small-span prestressed concrete girder with a small transverse width, and meanwhile, the two kinds of bridges apply different earthquake defense strategies, namely, one side is an earthquake-resistant girder with an earthquake-resistant support installed at the bottom of the girder and the other side is an earthquake-resistant girder with an earthquake-resistant support installed at the bottom of the girder. The anti-seismic beam end can only move along the bridge direction, and the movement amount in the transverse bridge direction is small. The vibration isolation beam can move along the bridge direction and can also move along the transverse bridge direction. Therefore, under the normal use condition, under the action of train transverse swinging force, centrifugal force, temperature and the like, the transverse displacement values of the bridges on the two sides of the bridge pier are different, so that the bridge deck steel rails have different transverse displacements. Especially, the ballastless track bridge has strict requirements on the transverse relative displacement of the steel rail supporting points on two sides of the adjacent beam ends, and a technical means is needed to connect the two beam ends so that the transverse displacement amplitude of the two beam ends is consistent under the non-earthquake working condition.
At present, auxiliary steel beams are adopted, but the problem that bridges on two sides are anti-seismic beams can only be solved, two beam ends are connected, so that the transverse moving amplitudes of the two beams are consistent under the non-seismic working condition, and the contradiction that the anti-seismic beams and the anti-seismic beam ends need to be displaced together under the normal condition and need to be relatively dislocated under the seismic condition cannot be solved.
SUMMERY OF THE UTILITY MODEL
The invention provides a railway bridge beam end transverse displacement coordination device, and aims to solve the problems that an existing railway bridge beam end transverse displacement coordination device cannot solve the problems that an anti-seismic beam and an anti-seismic beam end need to be displaced together under normal conditions, and relative dislocation is needed under an earthquake condition.
The invention is realized in this way, a railway bridge beam end lateral displacement coordination device, including a limit component and a control component, the limit component includes a fixed seat, a limit shaft, a coordination tenon, a vibration isolation beam and a quake-proof beam, the fixed seat is fixedly connected with the vibration isolation beam and is located at the upper and lower ends of the right side of the vibration isolation beam, the coordination tenon is fixedly connected with the coordination seat and is located at the front end of the coordination seat, the limit shaft is fixedly connected with the fixed seat and is located between two adjacent groups of the fixed seats, the quake-proof beam is fixedly connected with the coordination tenon and is located at one side of the coordination tenon far away from the vibration isolation beam; the upper side wall and the lower side wall of the coordination seat are provided with sliding holes, and the limiting shaft penetrates through the sliding holes to the fixed seat;
the control assembly comprises a limiting device, a shaft seat, a winding shaft, a limiting steel wire, a limiting motor, a vibration sensor and a controller, the shaft seat is fixedly connected with the vibration isolation beam and uniformly and equidistantly arranged at the bottom end of the coordination tenon, the winding shaft is rotatably connected with the shaft seat and penetrates through the shaft seat, the limiting device is fixedly connected with the coordination tenon and uniformly and equidistantly arranged at the bottom end of the coordination tenon, the limiting steel wire is fixedly connected with the limiting device and positioned at the bottom end of the limiting device, one end of the limiting steel wire, far away from the limiting device, is fixedly connected with the winding shaft, the limiting motor is fixedly connected with the winding shaft and positioned at the left side of the winding shaft, the vibration sensor is fixedly connected with the fixing seat and positioned at the front side of the fixing seat, and the controller is fixedly connected with the vibration isolation beam, and the vibration sensor and the limiting motor are electrically connected with the controller.
Preferably, the limiting assembly further comprises a tenon body anchor, the tenon body anchor is fixedly connected with the coordination tenon, the coordination tenon is uniformly and equidistantly arranged on one side, away from the vibration isolation beam, of the coordination tenon, and the tenon body anchor is fixedly connected with the vibration isolation beam.
Preferably, the width of the coordination seat is the same as the diameter of the limit shaft, the length of the coordination seat is greater than the diameter of the limit shaft, and the diameter of the limit disc is greater than the width of the coordination seat.
Preferably, the control assembly further comprises a reinforcing rib, wherein the reinforcing rib and the coordination tenon are integrally formed and are uniformly and equidistantly arranged on the surface of the coordination tenon.
Preferably, the limiting assembly further comprises a coordinating seat, and the coordinating seat is sleeved on the outer side of the limiting shaft.
Preferably, the limiting assembly further comprises a limiting disc, and the limiting disc is fixedly connected with the coordination seat and is located at the bottom end of the winding shaft.
Preferably, the control assembly further comprises a motor base, wherein the motor base is fixedly connected with the limiting motor and the vibration isolation beam respectively and is located in the middle of the limiting motor and the vibration isolation beam.
Compared with the prior art, the invention has the beneficial effects that: the invention relates to a railway bridge beam end transverse displacement coordination device, which is characterized in that a vibration sensor, a limit motor and a controller are arranged, the vibration sensor can be used for detecting whether a fixed seat vibrates to judge whether an earthquake occurs, a detection signal is transmitted to the controller, then the controller controls the limit motor to work to control the limit steel wire to be wound and unwound, so that the limit steel wire is in a tensioning state under the non-earthquake condition, the vibration isolation beam and the earthquake-proof beam have no relative dislocation in the vertical direction but can slide left and right relatively, under the earthquake occurrence condition, the limit steel wire is in a loosening state, the vibration isolation beam and the earthquake-proof beam can relatively dislocate in the vertical direction and slide up and down in the horizontal direction, thereby providing a moving space for the vibration isolation beam and the earthquake-proof beam during the earthquake, effectively solving the problem that the vibration isolation beam and the beam end need to jointly displace in the normal condition, and the contradiction of relative dislocation is needed in the case of earthquake.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a top view of the coordinating structure of the present invention;
FIG. 3 is a schematic view of the coordinating tenon of the present invention.
In the figure: 1-limiting component, 11-fixing seat, 12-limiting shaft, 13-limiting disc, 14-coordinating seat, 15-coordinating tenon, 16-tenon body anchoring, 17-vibration isolation beam, 18-anti-vibration beam, 19-sliding hole, 2-control component, 20-limiting device, 21-shaft seat, 22-winding shaft, 23-limiting steel wire, 24-limiting motor, 25-motor seat, 26-vibration sensor, 27-controller and 28-reinforcing rib.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1-3, the present invention provides a technical solution: a railway bridge beam end transverse displacement coordination device comprises a limiting assembly 1 and a control assembly 2, wherein the limiting assembly 1 comprises a fixed seat 11, a limiting shaft 12, a coordination tenon 15, a vibration isolation beam 17 and an anti-seismic beam 18, the fixed seat 11 is fixedly connected with the vibration isolation beam 17 and is positioned at the upper end and the lower end of the right side of the vibration isolation beam 17, the limiting shaft 12 is fixedly connected with the fixed seat 11 and is positioned between two adjacent groups of fixed seats 11, the coordination tenon 15 is fixedly connected with a coordination seat 14 and is positioned at the front end of the coordination seat 14, the anti-seismic beam 18 is fixedly connected with the coordination tenon 15 and is positioned on one side of the coordination tenon 15, which is far away from the vibration isolation beam 17;
the control component 2 comprises a limiter 20, a shaft seat 21, a winding shaft 22, a limiting steel wire 23, a limiting motor 24, a vibration sensor 26 and a controller 27, wherein the shaft seat 21 is fixedly connected with the vibration isolation beam 17 and is uniformly and equidistantly arranged at the bottom end of the coordination tenon 15, the winding shaft 22 is rotatably connected with the shaft seat 21 and penetrates through the shaft seat 21, the limiter 20 is fixedly connected with the coordination tenon 15 and is uniformly and equidistantly arranged at the bottom end of the coordination tenon 15, the limiting steel wire 23 is fixedly connected with the limiter 20 and is positioned at the bottom end of the limiter 20, one end of the limiting steel wire 23, which is far away from the limiter 20, is fixedly connected with the winding shaft 22, the limiting motor 24 is fixedly connected with the winding shaft 22 and is positioned at the left side of the winding shaft 22, the vibration sensor 26 is fixedly connected with the fixed seat 11 and is positioned at the front side of the fixed seat 11, the controller 27 is fixedly connected with the vibration isolation beam 17 and is positioned at the front side of the vibration isolation beam 17, and both the vibration sensor 26 and the limiting motor 24 are electrically connected with the controller 27, the vibration sensor 26 is of the model VP-1210 and the controller 27 is of the model AX3U-16 MR-001.
In this embodiment, by providing the vibration sensor 26, the limiting motor 24 and the controller 27, the vibration sensor 26 can be used to detect whether the fixed seat 11 vibrates, so as to determine whether an earthquake occurs, the controller 27 is used to receive vibration information detected by the vibration sensor 26, and control the limiting motor 24 to work, so that the limiting motor 24 can drive the winding shaft 22 to rotate, so as to wind the limiting steel wire 23, control the vertical movement of the coordinating seat 14, so that the limiting steel wire 23 is in a tensioned state under a non-earthquake condition, so that the vibration isolation beam 17 and the anti-earthquake beam 18 do not have relative vertical movement but can realize relative left-right sliding, and under an earthquake, the limiting steel wire 23 is in a relaxed state, so that the vibration isolation beam 17 and the anti-earthquake beam 18 can relatively vertical movement and relative left-right sliding movement, thereby providing a movement space for the vibration isolation beam 17 and the anti-earthquake beam 18 during an earthquake, the contradiction that the beam ends of the vibration isolation beam 17 and the anti-seismic beam 18 need to be displaced together under the normal condition and need to be relatively dislocated under the earthquake condition is effectively solved.
Further, the limiting assembly 1 further comprises a tenon body anchoring portion 16, one end of the tenon body anchoring portion 16 is fixedly connected with the coordinating tenon 15, the tenon body anchoring portion is evenly and equidistantly arranged on one side, away from the vibration isolation beam 17, of the coordinating tenon 15, and the other end of the tenon body anchoring portion 16 is fixedly connected with the anti-seismic beam 18.
In the embodiment, one end of the tenon body anchor 16 is fixed with the coordination tenon 15 through a fixing plate, the tenon body anchor 16 is uniformly and equidistantly arranged on one side of the coordination tenon 15, which is far away from the vibration isolation beam 17, the other end of the tenon body anchor 16 is fixedly connected with the vibration isolation beam 18, the vibration isolation beam 18 is connected with the coordination tenon 15 through the tenon body anchor 16, the coordination tenon 15 is conveniently connected with the vibration isolation beam 17 through the coordination tenon 15, the vibration isolation beam 17 is conveniently coordinated with the vibration isolation beam 18, and the coordination tenon 15 and the tenon body anchor 16 can be effectively connected and fixed through the tenon body anchor 16.
Further, the limiting component 1 further comprises a sliding hole 19, the sliding hole 19 is formed in the upper side wall and the lower side wall of the coordination seat 14, the limiting shaft 12 penetrates through the sliding hole 19 to the fixing seat 11, the width of the coordination seat 14 is the same as the diameter of the limiting shaft 12, the length of the coordination seat 14 is larger than the diameter of the limiting shaft 12, and the diameter of the limiting disc 13 is larger than the width of the coordination seat 14.
In this embodiment, the upper and lower side walls of the coordination seat 14 are provided with sliding holes 19, the limiting shaft 12 penetrates through the sliding holes 19 to the fixing seat 11, the sliding holes 19 are formed, the limiting shaft 12 is sleeved in the inner cavity of the sliding holes 19, the length of the coordination seat 14 is greater than the diameter of the limiting shaft 12, the diameter of the limiting disc 13 is greater than the width of the coordination seat 14, the limiting shaft 12 can conveniently slide and rotate in the inner cavity of the sliding holes 19, and meanwhile, the limiting disc 13 can limit the coordination seat 14.
Further, the control assembly 2 further comprises a reinforcing rib 28, and the reinforcing rib 28 is integrally formed with the coordinating tenon 15 and is uniformly and equidistantly arranged on the surface of the coordinating tenon 15.
In the present embodiment, the reinforcing ribs 28 and the coordinating tenon 15 are integrally formed and uniformly arranged on the surface of the coordinating tenon 15 at equal intervals, wherein the reinforcing ribs 28 can be used for improving the strength of the coordinating tenon 15 and making the coordinating tenon 15 more stable when in use.
Further, the limiting component 1 further includes a coordinating seat 14, and the coordinating seat 14 is sleeved on the outer side of the limiting shaft 12.
In this embodiment, the coordination seat 14 is sleeved outside the limit shaft 12, the coordination seat 14 makes the connection of the limit shaft 12 more stable, and the coordination tenon 15 and the coordination seat 14 are fixed by a thread or a welding manner.
Further, the limiting component 1 further comprises a limiting disc 13, and the limiting disc 13 is fixedly connected with the coordination seat 14 and is located at the bottom end of the limiting shaft 12.
In this embodiment, the limiting disc 13 and the coordinating seat 14 are fixed by welding or thread fixing, and the limiting disc 13 conveniently limits the limiting shaft 12, so that the limiting shaft 12 can be effectively prevented from shifting.
Further, the control assembly 2 further comprises a motor base 25, wherein the motor base 25 is fixedly connected with the limiting motor 24 and the vibration isolation beam 17 respectively and is located at the middle position of the limiting motor 24 and the vibration isolation beam 17.
In the embodiment, the motor base 25 is respectively fixedly connected with the limiting motor 24 and the vibration isolation beam 17 through nuts, so that the limiting motor 24 and the vibration isolation beam 17 are conveniently fixed, the work of the limiting motor 24 is more stable, and the fault rate of the limiting motor 24 is reduced.
Utility model's theory of operation and use flow: after the earthquake-proof device is installed, the vibration sensor 26 can detect whether the fixed seat 11 is moved or not in real time, when an earthquake occurs, the vibration isolation beam 17 and the fixed seat 11 vibrate and are simultaneously sensed by the vibration sensor 26, then the vibration sensor 26 transmits sensed vibration signals to the controller 27, then the controller 27 controls the limiting motor 24 to work, so that the limiting motor 24 drives the winding shaft 22 to rotate, the wound and tensioned limiting steel wire 23 is discharged, the limiting steel wire 23 is in a loose state, the vibration isolation beam 17 and the earthquake-proof beam 18 can relatively stagger in the up-down direction and relatively slide in the left-right direction and the up-down direction, thereby providing a moving space for the vibration isolation beam 17 and the earthquake-proof beam 18 to move during the earthquake, when no earthquake occurs, the controller 27 controls the limiting motor 24 to work, the limiting steel wire 23 is wound on the winding shaft 22, and the limiting steel wire 23 is in a tensioned state, the vibration isolation beam 17 and the anti-seismic beam 18 do not have relative dislocation in the vertical direction, and can slide left and right relatively.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. The utility model provides a railway bridge beam-ends lateral displacement coordination device which characterized in that: the vibration isolation device comprises a limiting assembly (1) and a control assembly (2), wherein the limiting assembly (1) comprises a fixing seat (11), a limiting shaft (12), a coordinating tenon (15), vibration isolation beams (17) and a vibration isolation beam (18), the fixing seat (11) is fixedly connected with the vibration isolation beam (17) and is positioned at the upper end and the lower end of the right side of the vibration isolation beam (17), the limiting shaft (12) is fixedly connected with the fixing seat (11) and is positioned between two adjacent groups of fixing seats (11), the coordinating tenon (15) is fixedly connected with a coordinating seat (14) and is positioned at the front end of the coordinating seat (14), and the beam (18) is fixedly connected with the vibration isolation tenon (15) and is positioned on one side of the coordinating tenon (15) far away from the vibration isolation beam (17); the upper side wall and the lower side wall of the coordination seat (14) are provided with sliding holes (19), and the limiting shaft (12) penetrates through the sliding holes (19) to the fixed seat (11);
the control assembly (2) comprises a limiter (20), a shaft seat (21), a winding shaft (22), a limiting steel wire (23), a limiting motor (24), a vibration sensor (26) and a controller (27), the shaft seat (21) is fixedly connected with the vibration isolation beam (17) and uniformly and equidistantly arranged at the bottom end of the coordination tenon (15), the winding shaft (22) is rotatably connected with the shaft seat (21) and penetrates through the shaft seat (21), the limiter (20) is fixedly connected with the coordination tenon (15) and uniformly and equidistantly arranged at the bottom end of the coordination tenon (15), the limiting steel wire (23) is fixedly connected with the limiter (20) and is positioned at the bottom end of the limiter (20), one end of the limiting steel wire (23) far away from the limiter (20) is fixedly connected with the winding shaft (22), the limiting motor (24) is fixedly connected with the winding shaft (22), and is located the left side of coiling axle (22), vibration sensor (26) with fixing base (11) fixed connection, and be located the front side of fixing base (11), controller (27) with vibration isolation roof beam (17) fixed connection, and be located the front side of vibration isolation roof beam (17), vibration sensor (26) with spacing motor (24) all with controller (27) electric connection.
2. The device for coordinating lateral displacement of a beam end of a railroad bridge of claim 1, wherein: spacing subassembly (1) still includes tenon body anchor (16), tenon body anchor (16) with coordinate tenon (15) fixed connection, and even equidistant set up in coordinate tenon (15) keep away from one side of vibration isolation roof beam (17), tenon body anchor (16) with antidetonation roof beam (18) fixed connection.
3. The device for coordinating lateral displacement of a beam end of a railroad bridge of claim 1, wherein: the control assembly (2) further comprises a motor base (25), wherein the motor base (25) is fixedly connected with the limiting motor (24) and the vibration isolation beam (17) and is located in the middle of the limiting motor (24) and the vibration isolation beam (17).
4. The device for coordinating lateral displacement of a beam end of a railroad bridge of claim 1, wherein: the control assembly (2) further comprises a reinforcing rib (28), wherein the reinforcing rib (28) and the coordination tenon (15) are integrally formed and are uniformly and equidistantly arranged on the surface of the coordination tenon (15).
5. The device for coordinating lateral displacement of a beam end of a railroad bridge of claim 1, wherein: the limiting assembly (1) further comprises a coordination seat (14), and the coordination seat (14) is sleeved on the outer side of the limiting shaft (12).
6. The device for coordinating lateral displacement of a beam end of a railroad bridge of claim 1, wherein: the limiting assembly (1) further comprises a limiting disc (13), wherein the limiting disc (13) is fixedly connected with the coordination seat (14) and is located at the bottom end of the limiting shaft (12).
7. The device for coordinating lateral displacement of a beam end of a railroad bridge of claim 6, wherein: the width of the coordination seat (14) is the same as the diameter of the limit shaft (12), the length of the coordination seat (14) is larger than the diameter of the limit shaft (12), and the diameter of the limit disc (13) is larger than the width of the coordination seat (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010424415.7A CN111519516B (en) | 2020-05-19 | 2020-05-19 | Railway bridge beam end lateral displacement coordination device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010424415.7A CN111519516B (en) | 2020-05-19 | 2020-05-19 | Railway bridge beam end lateral displacement coordination device |
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| Publication Number | Publication Date |
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| CN111519516A CN111519516A (en) | 2020-08-11 |
| CN111519516B true CN111519516B (en) | 2021-08-31 |
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| CN202010424415.7A Active CN111519516B (en) | 2020-05-19 | 2020-05-19 | Railway bridge beam end lateral displacement coordination device |
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| KR20010064555A (en) * | 1999-12-29 | 2001-07-09 | 박재만 | Apparatus to prevent the negative moment of a bridge and thereof method |
| CN201254695Y (en) * | 2008-08-28 | 2009-06-10 | 山河建设集团有限公司 | Pulling-connecting device for enhancing antivibration capability of bridge |
| CN106351114A (en) * | 2016-09-26 | 2017-01-25 | 石家庄铁道大学 | Multi-level anti-seismic device capable of preventing bridge from colliding and falling |
| CN206448150U (en) * | 2017-02-09 | 2017-08-29 | 株洲中车特种装备科技有限公司 | A kind of attachment structure for tourist coach track girder |
| CN206736706U (en) * | 2017-05-03 | 2017-12-12 | 河海大学 | A kind of concrete cast-in-situ bridge anti-fall girder apparatus |
| CN111021220A (en) * | 2019-12-19 | 2020-04-17 | 湖南大学 | Transverse bridge direction connecting piece for arch bridge circulation construction, arch bridge and construction method thereof |
| CN111155418A (en) * | 2020-01-15 | 2020-05-15 | 东南大学 | Beam falling prevention device and method using fabricated bridge hanging point structure |
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2020
- 2020-05-19 CN CN202010424415.7A patent/CN111519516B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010064555A (en) * | 1999-12-29 | 2001-07-09 | 박재만 | Apparatus to prevent the negative moment of a bridge and thereof method |
| CN201254695Y (en) * | 2008-08-28 | 2009-06-10 | 山河建设集团有限公司 | Pulling-connecting device for enhancing antivibration capability of bridge |
| CN106351114A (en) * | 2016-09-26 | 2017-01-25 | 石家庄铁道大学 | Multi-level anti-seismic device capable of preventing bridge from colliding and falling |
| CN206448150U (en) * | 2017-02-09 | 2017-08-29 | 株洲中车特种装备科技有限公司 | A kind of attachment structure for tourist coach track girder |
| CN206736706U (en) * | 2017-05-03 | 2017-12-12 | 河海大学 | A kind of concrete cast-in-situ bridge anti-fall girder apparatus |
| CN111021220A (en) * | 2019-12-19 | 2020-04-17 | 湖南大学 | Transverse bridge direction connecting piece for arch bridge circulation construction, arch bridge and construction method thereof |
| CN111155418A (en) * | 2020-01-15 | 2020-05-15 | 东南大学 | Beam falling prevention device and method using fabricated bridge hanging point structure |
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