Restraint system for longitudinal movement of suspension bridge girder

Abstract

The utility model relates to the technical field of bridge engineering, in particular to a restraint system for longitudinal movement of a suspension bridge girder. Comprising main cables, bridge towers and stiffening beams. The stiffening beam is matched with a cross beam of the bridge tower, and bridge abutments are arranged at the two beam ends of the stiffening beam respectively; the device further comprises a first restraining part, a second restraining part and a third restraining part. The first constraint part is arranged between the cross beam and the stiffening beam, the second constraint part is arranged between the beam end of the stiffening beam and the bridge abutment, and the first constraint part and the second constraint part are used for applying longitudinal constraint to the stiffening beam; and the lowest point of the main cable is connected with the stiffening beam through a third constraint part. Longitudinal movement of the stiffening beams of the suspension bridge is jointly restrained through the first restraining part, the second restraining part and the third restraining part at multiple positions of the bridge, the longitudinal movement of the stiffening beams can be reduced as much as possible, and the problem that an existing longitudinal restraining system for the large-span suspension bridge is too single is solved. And the safety of the suspension bridge under the operation condition is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering, in particular to a restraint system for the longitudinal movement of the main girder of a suspension bridge. Background Art

[0002] As a bridge type with the largest span capacity, suspension bridges are widely used in highway bridge construction. A suspension bridge mainly consists of cables, bridge towers, anchorages, and stiffening girders (main girders), and the structural system is usually a floating system or a semi-floating system, where the stiffening girders are generally made of steel girders. At present, a large number of long-span railway suspension bridges have gradually emerged in China. This type of suspension bridge is usually in the form of a steel truss girder, and the structural system is a continuous system.

[0003] During the operation of the bridge, under the action of factors such as wind, vehicles, and temperature, the suspension bridge is prone to high-frequency and small-amplitude longitudinal movement responses and low-frequency quasi-static longitudinal movements. Large longitudinal cumulative displacements will occur at the beam ends of the stiffening girders, which will further lead to the damage of the beam end expansion devices. After the beam end expansion devices are damaged, it is necessary to replace the expansion joints and dampers. The project of replacing the expansion joints not only costs a huge amount, but also requires the closure of the bridge, which will have a greater impact on the local traffic and cause great economic losses.

[0004] At present, domestic long-span suspension bridges usually set viscous dampers longitudinally to meet the seismic requirements of the suspension bridge and control the beam end displacements. However, viscous dampers are velocity-related, do not add structural stiffness, only increase the structural damping ratio, have poor control effects on low-speed vibrations, and have poor displacement control for high-frequency and low-amplitude vibrations. There is a risk of oil leakage under high-frequency and low-amplitude longitudinal movements; and if only the longitudinal movement of the stiffening girder is controlled, it will lead to too large relative displacement differences between the cables and the girders, which will further affect the service life of components such as suspenders.

[0005] Therefore, it is unreasonable to use a single type of seismic damper to simultaneously control the longitudinal movement during seismic and operating states. It is necessary to propose a new restraint system for the longitudinal movement of the main girder of a suspension bridge according to the characteristics of the longitudinal movement during the operation process. Summary of the Utility Model

[0006] The purpose of the utility model is to overcome the problem that it is difficult to meet the longitudinal movement control of a suspension bridge by using a single type of seismic damper in the prior art, and to provide a restraint system for the longitudinal movement of the main girder of a suspension bridge.

[0007] The utility model provides a restraint system for the longitudinal movement of the main girder of a suspension bridge, including main cables, bridge towers, and stiffening girders; the lowest point of the main cable is located between the two bridge towers and close to the stiffening girder. The bridge tower has a cross beam, the stiffening girder is adapted to the cross beam of the bridge tower, and abutments are respectively provided at the two beam ends of the stiffening girder.

[0008] Among them, it further includes a first restraint part, a second restraint part, and a third restraint part;

[0009] The first restraint part is arranged between the cross beam and the stiffening girder, the second restraint part is arranged between the beam end of the stiffening girder and the abutment, and the first restraint part and the second restraint part are used to apply longitudinal restraint to the stiffening girder;

[0010] The lowest point of the main cable is connected to the stiffening girder through a third restraint part.

[0011] Preferably, the first restraint part includes a viscous damper, and both ends of the viscous damper are respectively connected to the cross beam and the stiffening girder;

[0012] The damping direction of the viscous damper is distributed longitudinally.

[0013] Preferably, the first restraint part includes a plurality of the viscous dampers, and the plurality of viscous dampers are spaced apart transversely.

[0014] Preferably, the second restraint part includes an eddy current friction combined damper, and both ends of the eddy current friction combined damper are respectively connected to the beam end of the stiffening girder and the abutment;

[0015] The damping direction of the eddy current friction combined damper is distributed longitudinally.

[0016] Preferably, the second restraint part includes a plurality of the eddy current friction combined dampers, and the plurality of eddy current friction combined dampers are spaced apart transversely.

[0017] Preferably, the third restraint part includes a central buckle fixed to the stiffening girder, and the central buckle is connected to the lowest point of the main cable through a cable clamp.

[0018] Preferably, the central buckle is welded or bolted to the stiffening girder.

[0019] Preferably, the central buckle is a flexible central buckle or a rigid central buckle.

[0020] Preferably, the stiffening girder is a truss girder, and the first restraint part and / or the second restraint part are connected to the bottom truss girder of the stiffening girder by bolts.

[0021] Compared with the prior art, the beneficial effects of the present utility model:

[0022] 1. The restraint system for the longitudinal movement of the main girder of a suspension bridge provided by the present utility model jointly restrains the longitudinal movement of the stiffening girder of the suspension bridge at multiple positions of the bridge through the first restraint part, the second restraint part, and the third restraint part, which can minimize the longitudinal movement of the stiffening girder, solve the problem of the overly single longitudinal restraint system for long-span suspension bridges in the prior art, and improve the safety of the suspension bridge during operation. At the same time, through the setting of the third restraint part, the displacement difference between the stiffening girder and the main cable can be reduced, and the possibility of fatigue failure of short suspenders caused by the asynchronous movement of the main cable and the stiffening girder of long-span suspension bridges can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 FIG. 6 is a schematic structural diagram of a restraint system for the longitudinal movement of the main girder of a suspension bridge according to Embodiment 1 of the present utility model;

[0024] Figure 2 is Figure 1 a schematic structural diagram at position A in FIG. 6;

[0025] Figure 3 is Figure 1 a schematic structural diagram at position B in FIG. 6;

[0026] Figure 4 is Figure 1 a schematic structural diagram at position C in FIG. 6.

[0027] Reference numerals in the figure: 1 - bridge tower, 2 - stiffening girder, 3 - main cable, 4 - cross beam, 5 - abutment, 6 - viscous damper, 7 - electro - eddy friction combined damper, 8 - central buckle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following further describes the present utility model in detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the above - mentioned subject matter of the present utility model to the following embodiments. All technologies implemented based on the content of the present utility model belong to the scope of the present utility model.

[0029] In the description of the specific embodiments of the present utility model, without special explanation, the expression terms indicating the orientation or positional relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product / device / equipment of the present utility model is habitually used. These terms of orientation or positional relationship are only for the convenience of describing the solution of the present utility model or simplifying the description in the specific embodiments, facilitating technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, it should not be construed as a limitation to the present utility model.

[0030] In addition, when terms such as "horizontal", "vertical", "hanging", "parallel" appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel, but it can be slightly inclined or have a deviation. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in directions such as "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present utility model.

[0031] In addition, when expressions such as "first", "second", "third", etc. appear in the terms, they are only used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of specific components.

[0032] In addition, in the description of the embodiments of the present utility model, "several", "multiple", "a number of" represent at least 2. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., and can even be a situation of more than 9.

[0033] In addition, in the description of the technical solution of the present utility model, unless otherwise clearly specified / defined / restricted, when terms such as "set", "installed", "connected", "connected", "provided with", "laid", "arranged" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be connection means commonly used in the art such as welding, riveting, bolting, threaded connection, etc. This connection can be a mechanical connection, an electrical connection or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components.

[0034] Among them, the longitudinal direction mentioned in the present utility model refers to the longitudinal bridge direction of the suspension bridge; the transverse direction mentioned in the present utility model refers to the transverse bridge direction of the suspension bridge.

[0035] Embodiment 1

[0036] Such as Figures 1-4As shown in the figure, the utility model provides a restraint system for the longitudinal movement of the main girder of a suspension bridge, which is applied to a suspension bridge. The suspension bridge includes main cables 3, stiffening girders 2 and at least two bridge towers 1. The two ends of the main cables 3 cross over all the bridge towers 1 and are supported by all the bridge towers 1. The lowest point of the main cables 3 is located between the two bridge towers 1 and droops close to the stiffening girders 2. Each bridge tower 1 has a cross beam 4, and the height of the stiffening girder 2 is adapted to that of the cross beam 4. Near the two beam ends of the stiffening girder 2, there are also abutments 5 respectively.

[0037] On this basis, as Figure 1 shown, the restraint system further includes two first restraint parts, two second restraint parts and a third restraint part. Among them, the two first restraint parts are respectively arranged between the stiffening girder 2 and the two cross beams 4 for restraining the longitudinal movement between the cross beam 4 and the stiffening girder 2. The two second restraint parts are arranged between the two beam ends of the stiffening girder 2 and the two abutments 5 for restraining the longitudinal movement between the beam end of the stiffening girder 2 and the abutment 5. At this time, the first restraint part and the second restraint part jointly apply longitudinal restraint to the stiffening girder 2.

[0038] The lowest point of the main cable 3 is connected to the stiffening girder 2 through the third restraint part, so as to control the longitudinal movement of the main cable 3 through the stiffening girder 2 and improve the coordination of the movement between the main cable 3 and the stiffening girder 2.

[0039] Thus, the second restraint part restrains the two beam ends of the stiffening girder 2, the third restraint part restrains the middle part of the stiffening girder 2, and the first restraint part restrains the part between the third restraint part and the two second restraint parts. By jointly restraining the longitudinal movement of the stiffening girder 2 of the suspension bridge at multiple positions of the bridge through the first restraint part, the second restraint part and the third restraint part, the longitudinal movement of the stiffening girder 2 can be minimized as much as possible, solving the problem that the longitudinal restraint system of the existing long-span suspension bridge is too single and improving the safety of the suspension bridge under the operating condition. At the same time, through the setting of the third restraint part, the displacement difference between the stiffening girder 2 and the main cable 3 can be reduced, and the possibility of fatigue failure of the short suspension cables caused by the asynchronous movement of the main cable 3 and the stiffening girder 2 of the long-span suspension bridge can be reduced.

[0040] In one or more embodiments, as Figure 2 shown, the first restraint part may include a viscous damper 6. The two ends of the viscous damper 6 are respectively connected to the cross beam 4 and the stiffening girder 2. The connection method may be that one end is connected to the bottom of the stiffening girder 2 through a hinge seat, and the other end is connected to the top of the cross beam 4 through a hinge seat. Among them, the viscous damper 6 is arranged parallel to the longitudinal direction of the bridge, so that its damping direction is distributed along the longitudinal direction.

[0041] The viscous damper 6 can be a low-index viscous damper, such as a low-index viscous damper described in the patent with the application number 202210321131.4.

[0042] The piston of the low-index viscous damper often adopts a small-hole structure of a pressure-sensing valve type, and its internal structure, damping medium, sealing technology, etc. have relatively high standards, and good mechanical properties can be ensured under both low-speed and high-speed conditions.

[0043] Among them, the number of viscous dampers 6 included in each first restraint part can be multiple, and the multiple viscous dampers 6 are distributed at intervals in the transverse direction on the corresponding cross beam 4.

[0044] In one or more embodiments, as Figure 3 shown, the second restraint part may include an eddy current friction combined damper 7. The two ends of the eddy current friction combined damper 7 are respectively connected to the beam end of the stiffening beam 2 and the abutment 5, and the connection method may be that one end is connected to the bottom of both ends of the stiffening beam 2 through a hinge seat, and the other end is connected to the side surface of the abutment 5 facing the bridge through a hinge seat; among them, the eddy current friction combined damper 7 is arranged parallel to the longitudinal direction of the bridge, so that its damping direction is distributed along the longitudinal direction.

[0045] Among them, the number of eddy current friction combined dampers 7 included in each second restraint part can be multiple, and the multiple eddy current friction combined dampers 7 are distributed at intervals in the transverse direction on the side surface of the corresponding abutment 5.

[0046] Under the action of operating loads and seismic loads, the viscous damper 6 of the first restraint part and the eddy current friction combined damper 7 of the second restraint part work together, and by providing dampers in opposite directions of motion to the stiffening beam 2, the longitudinal motion of the stiffening beam 2 is inhibited. Among them, the operating loads include train braking, traffic loads, and temperature loads.

[0047] Among them, through the cooperation of the eddy current friction combined damper 7 of the second restraint part and the viscous damper 6 of the first restraint part, the stability of the damping can be improved. For example, when the viscous damper 6 leaks oil and fails, the eddy current friction combined damper 7 and the third restraint part can still participate in the work; the problem that the longitudinal motion gets out of control after the viscous damper 6 of a long-span suspension bridge fails is avoided.

[0048] In one or more embodiments, as Figure 4 shown, the third restraint part may include a central buckle 8 fixed to the stiffening beam 2. A cable clamp is provided at the top of the central buckle 8, and the central buckle 8 is connected to the lowest point of the main cable 3 through the cable clamp.

[0049] Under the action of the operating load, the central buckle 8 connects the main cable 3 and the stiffening girder 2 to form an integral body. When the stiffening girder 2 has a tendency to move, the internal force of the central buckle 8 increases, and the connection effect enables the stiffening girder 2 and the main cable 3 to move synchronously, thereby improving the coordination of movement between the main cable 3 and the stiffening girder 2 and reducing the possibility of fatigue failure of the short suspender caused by the asynchronous movement of the main cable 3 and the stiffening girder 2 of the long-span suspension bridge.

[0050] Wherein, the central buckle 8 and the stiffening girder 2 can be welded or connected by bolts.

[0051] Wherein, the central buckle 8 can be a flexible central buckle or a rigid central buckle.

[0052] It should be noted that this constraint system can be used for long-span suspension bridges (suspension bridges with a span of more than 1000 m). Among them, most long-span suspension bridges use truss girders as the stiffening girder 2.

[0053] On this basis, the first constraint part and / or the second constraint part can be connected to the bottom truss girder of the stiffening girder 2 by bolts.

[0054] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A system for restraining the longitudinal movement of a main beam of a suspension bridge, characterized in that: The invention comprises a main cable (3), a bridge tower (1) and a stiffening beam (2); the lowest point of the main cable (3) is located between the two bridge towers (1) and close to the stiffening beam (2); the bridge tower (1) has a cross beam (4); the stiffening beam (2) is adapted to the cross beam (4) of the bridge tower (1); and two beam ends of the stiffening beam (2) are respectively provided with abutments (5); Wherein, it also includes a first constraint part, a second constraint part and a third constraint part; The first constraint portion is arranged between the cross beam (4) and the stiffening beam (2), and the second constraint portion is arranged between the beam end of the stiffening beam (2) and the abutment (5), and the first constraint portion and the second constraint portion are used to apply longitudinal constraints to the stiffening beam (2); The lowest point of the main cable (3) is connected to the stiffening beam (2) via a third restraining portion.

2. A system for restraining the longitudinal movement of a suspension bridge main beam according to claim 1, characterized in that: The first constraint portion comprises a viscous damper (6), and two ends of the viscous damper (6) are respectively connected to the cross beam (4) and the stiffening beam (2); The damping direction of the viscous damper (6) is distributed along the longitudinal direction.

3. A system for restraining the longitudinal movement of a main beam of a suspension bridge according to claim 2, characterized in that: The first constraint portion comprises a plurality of viscous dampers (6), and the plurality of viscous dampers (6) are distributed at intervals in the lateral direction.

4. A system for restraining the longitudinal movement of a suspension bridge main beam according to any one of claims 1 to 3, characterized in that: The second constraint portion comprises an eddy current friction combined damper (7), and two ends of the eddy current friction combined damper (7) are respectively connected to the beam end of the stiffening beam (2) and the abutment (5); The damping direction of the eddy current friction combined damper (7) is distributed along the longitudinal direction.

5. A system for restraining the longitudinal movement of a main beam of a suspension bridge according to claim 4, characterized in that: The second constraint portion comprises a plurality of eddy current friction combination dampers (7), and the plurality of eddy current friction combination dampers (7) are distributed at intervals in the lateral direction.

6. The longitudinal motion restraint system of a suspension bridge main beam according to claim 1, characterized in that: The third restraining part comprises a central buckle (8) fixed to the stiffening beam (2), and the central buckle (8) is connected to the lowest point of the main cable (3) through a cable clamp.

7. A system for restraining the longitudinal movement of a main beam of a suspension bridge according to claim 6, characterized in that: The central buckle (8) is welded to the stiffening beam (2) or connected via bolts.

8. The system for restraining the longitudinal movement of the main beam of a suspension bridge according to claim 6, characterized in that: The central buckle (8) is a flexible central buckle or a rigid central buckle.

9. The longitudinal motion restraint system of a suspension bridge main beam according to claim 1, characterized in that: The stiffening beam (2) is a truss beam, and the first restraining portion and / or the second restraining portion are connected to the bottom truss beam of the stiffening beam (2) by means of bolts.

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