Longitudinal restraint apparatus and method for a bridge

Abstract

The application relates to a longitudinal restraint device and method for a bridge, and relates to the technical field of bridge engineering, which comprises a longitudinal restraint mechanism arranged between a main beam and a main tower and used for connecting the main beam and the main tower, the longitudinal restraint mechanism being used for relatively fixing the main beam and the main tower or enabling the main beam to move relative to the main tower; and a damping mechanism used for connecting the main beam and the main tower respectively and providing damping action when the main beam and the main tower relatively move. In a normal case, the structure integrity advantage brought by the tower-beam fixation is kept, and when the main beam 2 needs to move relative to the main tower 3, the fixation is released, the longitudinal internal force can be conveniently released, and the damping mechanism 4 can absorb the energy generated by the relative displacement and rapidly stabilize the structure at the moment when the longitudinal restraint is released, so that the problems that the longitudinal movable support loses the structure integrity advantage brought by the tower-beam fixation in the prior art, and the movable support with a large displacement amount has a large sliding amount during operation and is seriously worn and has poor durability are solved.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, and specifically to a longitudinal restraint device and method for bridges. Background Technology

[0002] In modern long-span cable-stayed bridges and similar long-span bridges, the main towers and main beams are often connected by a fixed or semi-fixed connection to achieve direct mechanical transfer and structural integrity. For long-span bridges, this fixed connection method provides better overall stiffness and stability under live loads and wind loads, which is crucial for controlling the bridge's alignment and vibration response.

[0003] However, traditional tower-beam fixed systems present a significant technical challenge: effectively releasing the enormous longitudinal internal forces caused by changes in ambient temperature (such as thermal expansion and contraction). This is particularly true for ultra-long multi-tower cable-stayed bridges. If all main towers are fixed to the main beam, the massive longitudinal internal forces generated when the steel beam expands or contracts due to temperature increases or decreases cannot be effectively released. This leads to the accumulation of excessive additional stress in the main beam and towers, posing a potential threat to the long-term safety and fatigue life of the large-span structure.

[0004] In existing technology, such as the device for limiting the longitudinal displacement of the main steel girder of a semi-floating cable-stayed bridge (patent number CN221760472U), a hydraulic damper, connecting rod components, a transverse pre-reserved block, and a pre-embedded square steel plate are included. The hydraulic damper consists of two cylindrical cylinders with relative displacement. The connecting components include pin heads, pin shafts, and connecting seats, and are located at both ends of the hydraulic damper. The transverse pre-reserved block is integrally cast into the main tower crossbeam. The pre-embedded square steel plate passes through longitudinal pre-embedded reinforcing bars and is attached to the surface of the transverse pre-reserved block. The engineering significance of this utility model patent lies in limiting the longitudinal displacement of the bridge during the operation and maintenance phase, improving the bridge's safety, and extending its service life.

[0005] However, longitudinal movable supports lose the structural integrity advantage brought by the tower-beam consolidation, and movable supports with large displacement have a large amount of sliding during operation, resulting in severe wear and poor durability. Summary of the Invention

[0006] This application provides a longitudinal restraint device and method for bridges, which can solve the problems of existing longitudinal movable bearings losing the structural integrity advantage brought by the tower-beam solidification, and movable bearings with large displacement having large sliding volume during operation, resulting in severe wear and poor durability.

[0007] In a first aspect, embodiments of this application provide a longitudinal restraint device for a bridge, comprising: A longitudinal constraint mechanism is provided between the main beam and the main tower and is used to connect with the main beam and the main tower. The longitudinal constraint mechanism is used to fix the main beam and the main tower relatively, or to allow the main beam to move relative to the main tower. A damping mechanism is used to connect to the main beam and the main tower respectively, and to provide damping when the main beam and the main tower move relative to each other.

[0008] In one embodiment, the longitudinal constraint mechanism includes two longitudinal constraint components, which are arranged opposite to each other and located on both sides of the lower crossbeam pad stone at the upper end of the main tower. One end of the two longitudinal constraint components is used to connect to the lower crossbeam pad stone, and the other end is used to connect to the lower side of the main beam.

[0009] In one embodiment, the damping mechanism includes two damping components, which are arranged opposite to each other and located on both sides of the lower crossbeam pad. One end of the two damping components is used to connect to the lower crossbeam pad, and the other end is used to connect to the underside of the main beam.

[0010] In one embodiment, the longitudinal restraint assembly includes a plurality of restraint hydraulic rods spaced laterally, and the damping assembly includes two dampers spaced laterally. Both the dampers and the restraint hydraulic rods are arranged longitudinally, with one end for connecting to the lower crossbeam pad and the other end for connecting to the main beam. The restraint hydraulic rods located on the same side of the lower crossbeam pad are all located between the two dampers on the same side.

[0011] In one embodiment, a connecting mechanism is further included, which is used to be disposed on the underside of the main beam. The connecting mechanism is provided on both sides of the lower crossbeam pad in the longitudinal direction, and the other end of the damper and the constraint hydraulic rod are connected to the main beam through the connecting mechanism.

[0012] Secondly, embodiments of this application also provide a longitudinal restraint method for bridges, which is implemented using the aforementioned longitudinal restraint device for bridges, and includes the following steps: Obtain the temperature change value and the magnitude of the longitudinal constraint force within a set time period; Determine whether the temperature change value within the set time period exceeds the change threshold, and whether the magnitude of the longitudinal constraint force exceeds the design threshold; When the temperature change exceeds the change threshold within a set time period, or the magnitude of the longitudinal constraint force exceeds the design threshold, the longitudinal constraint mechanism is adjusted to the released state so that the main beam can move relative to the main tower.

[0013] In one embodiment, after the longitudinal constraint mechanism is adjusted to allow the main beam to move relative to the main tower, the method further includes: Obtain the relative displacement rate of the main beam and the main tower, and determine whether the relative displacement rate of the main beam and the main tower is greater than the rate change threshold. The longitudinal constraint mechanism is adjusted based on the difference between the relative displacement rate of the main beam and the main tower and the rate change threshold.

[0014] In one embodiment, adjusting the longitudinal constraint mechanism based on the difference between the relative displacement rate of the main beam and the main tower and the rate change threshold includes: If the relative displacement rate of the main beam and the main tower is less than or equal to the rate change threshold, the longitudinal constraint mechanism is adjusted to fix the main beam and the main tower relatively. If the relative displacement rate between the main beam and the main tower is greater than the rate change threshold, the longitudinal constraint mechanism remains in the released state until the relative displacement rate between the main beam and the main tower is less than or equal to the rate change threshold.

[0015] In one embodiment, when the relative displacement rate between the main beam and the main tower is less than or equal to a rate change threshold, the method further includes: Determine if an early warning of an extreme load event has occurred; If this does not occur, adjust the longitudinal constraint mechanism to fix the main beam and main tower relatively. If this occurs, the longitudinal restraint mechanism remains in the released state until the extreme load event warning time ends, at which point the longitudinal restraint mechanism is adjusted to fix the main beam and main tower relatively.

[0016] In one embodiment, the longitudinal restraint mechanism is switched to the released state when a power outage or hydraulic oil leakage occurs.

[0017] The beneficial effects of the technical solutions provided in this application include: When installing this longitudinal restraint device for bridges, the longitudinal restraint mechanism is positioned between the main beam and the main tower, and is used to connect to both. The longitudinal restraint mechanism is used to relatively fix the main beam and the main tower, or to allow the main beam to move relative to the main tower. A damping mechanism is connected to both the main beam and the main tower, providing damping when the main beam and the main tower move relative to each other. Under normal circumstances, the longitudinal restraint mechanism relatively fixes the main beam and the main tower. During operation, the temperature change value and the magnitude of the longitudinal restraint force are acquired within a set time period. It is then determined whether the temperature change value exceeds a threshold value and whether the magnitude of the longitudinal restraint force exceeds a design threshold value. When the temperature change value exceeds the threshold value or the magnitude of the longitudinal restraint force exceeds the design threshold value, the longitudinal restraint mechanism is adjusted to a released state, allowing the main beam to move relative to the main tower. Under normal circumstances, the structural integrity advantage brought by the tower-beam fixed connection is maintained. When the main beam needs to move relative to the main tower, the fixed connection can be released to facilitate the release of longitudinal internal forces. At the moment the longitudinal constraint is released, the damping mechanism can absorb the energy generated by the relative displacement and quickly stabilize the structure. At the same time, it provides additional energy dissipation capacity under extreme loads (such as earthquakes). This solves the problem that the longitudinal movable support loses the structural integrity advantage brought by the tower-beam fixed connection in the existing technology, and the movable support with large displacement has a large amount of sliding during operation, resulting in severe wear and poor durability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the longitudinal restraint mechanism in an embodiment of the longitudinal restraint device for bridges according to the present invention.

[0020] Figure 2 This is a schematic diagram of the damping mechanism in an embodiment of the longitudinal restraint device for bridges according to the present invention.

[0021] Figure 3 This is a top view of an embodiment of a longitudinal restraint device for bridges according to the present invention.

[0022] Figure 4 This is a schematic diagram of the installation position of an embodiment of a longitudinal restraint device for bridges according to the present invention.

[0023] Figure 5 This is a flowchart illustrating a longitudinal constraint method for bridges according to the present invention.

[0024] In the diagram: 1. Longitudinal restraint mechanism; 11. Longitudinal restraint assembly; 111. Restraining hydraulic rod; 2. Main beam; 3. Main tower; 31. Lower crossbeam pad; 4. Damping mechanism; 41. Damping assembly; 411. Damper; 5. Connecting mechanism. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0026] This application provides a longitudinal restraint device and method for bridges, which can solve the problems of existing longitudinal movable supports losing the structural integrity advantage brought by the tower-beam solidification, and movable supports with large displacement having large sliding volume during operation, resulting in severe wear and poor durability.

[0027] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in one aspect, this application provides a longitudinal restraint device for bridges, comprising: The longitudinal constraint mechanism 1 is used to be installed between the main beam 2 and the main tower 3 and to be connected to the main beam 2 and the main tower 3. The longitudinal constraint mechanism 1 is used to fix the main beam 2 and the main tower 3 relatively, or to allow the main beam 2 to move relative to the main tower 3. The damping mechanism 4 is used to connect to the main beam 2 and the main tower 3 respectively, and provides damping when the main beam 2 and the main tower 3 move relative to each other.

[0028] When installing this longitudinal restraint device for bridges, the longitudinal restraint mechanism 1 is positioned between the main beam 2 and the main tower 3, and is used to connect with both the main beam 2 and the main tower 3. The longitudinal restraint mechanism 1 is used to relatively fix the main beam 2 and the main tower 3, or to allow the main beam 2 to move relative to the main tower 3. The damping mechanism 4 is connected to both the main beam 2 and the main tower 3, providing damping when the main beam 2 and the main tower 3 move relative to each other. Under normal circumstances, the longitudinal restraint mechanism 1 relatively fixes the main beam 2 and the main tower 3. During use, the temperature change value and the magnitude of the longitudinal restraint force are acquired within a set time period; it is determined whether the temperature change value within the set time period exceeds the change threshold, and whether the magnitude of the longitudinal restraint force exceeds the design threshold; when the temperature change value within the set time period exceeds the change threshold, or the magnitude of the longitudinal restraint force exceeds the design threshold, the longitudinal restraint mechanism 1 is adjusted to the released state, allowing the main beam 2 to move relative to the main tower 3. Under normal circumstances, the structural integrity advantage brought by the tower-beam fixed connection is maintained. When the main beam 2 needs to move relative to the main tower 3, the fixed connection can be released, which can easily release the longitudinal internal force. At the moment the longitudinal constraint is released, the damping mechanism 4 can absorb the energy generated by the relative displacement and quickly stabilize the structure. At the same time, it provides additional energy dissipation capacity under extreme loads (such as earthquakes). This solves the problem that the longitudinal movable support loses the structural integrity advantage brought by the tower-beam fixed connection in the existing technology, and the movable support with large displacement has a large amount of sliding during operation, resulting in serious wear and poor durability.

[0029] In this example, a sensor and intelligent control system is also included to monitor the bridge's operating status and environmental parameters in real time, and intelligently control the working mode of the longitudinal restraint mechanism 1 according to preset conditions. The sensors include temperature sensors, longitudinal force sensors, and displacement sensors. The intelligent control system determines whether the conditions for releasing the longitudinal restraint are met based on the sensor data.

[0030] Temperature sensors are placed at key locations on the main beam 2 and the main tower 3 to monitor the structural and ambient temperatures and provide inputs for the rate of temperature change and absolute temperature values.

[0031] The longitudinal force sensor (load sensor) is directly integrated or connected in parallel in the longitudinal constraint mechanism 1 to measure the longitudinal constraint force at the tower-beam connection in real time.

[0032] Displacement sensors monitor the relative longitudinal displacement between the main tower 3 and the main beam 2, providing information on displacement rate and total displacement.

[0033] The intelligent control system, centered on an industrial-grade programmable logic controller (PLC) or distributed control system (DCS), receives data from various sensors. The control system internally incorporates pre-set intelligent control algorithms and logic. Based on real-time data, the algorithm analyzes temperature change trends, longitudinal force magnitude, displacement status, etc., and compares them with preset thresholds to intelligently determine when to trigger the release and restoration of longitudinal constraints. For example, when it detects that the temperature change reaches 5 degrees Celsius or the longitudinal constraint force exceeds the design threshold within a specific time period, the intelligent control system will quickly send an action command to the longitudinal constraint mechanism 1.

[0034] In this example, critical components, sensors, and intelligent control systems should be configured with redundancy to improve system reliability.

[0035] like Figure 1 and Figure 3 As shown, in some optional embodiments, the longitudinal constraint mechanism 1 includes two longitudinal constraint components 11, which are arranged opposite to each other and located on both sides of the lower crossbeam pad 31 at the upper end of the main tower 3. One end of the two longitudinal constraint components 11 is used to connect with the lower crossbeam pad 31, and the other end is used to connect to the lower side of the main beam 2.

[0036] In this embodiment, the structure of the longitudinal constraint mechanism 1 is specifically described. The longitudinal constraint mechanism 1 includes two longitudinal constraint components 11, which are arranged opposite to each other and located on both sides of the lower crossbeam pad 31 at the upper end of the main tower 3. One end of the two longitudinal constraint components 11 is used to connect with the lower crossbeam pad 31, and the other end is used to connect to the lower side of the main beam 2. By arranging the longitudinal constraint components 11 on both sides of the lower crossbeam pad 31, both sides are constrained at the same time, resulting in better stability.

[0037] like Figure 2 and Figure 3 As shown, in some optional embodiments, the damping mechanism 4 includes two damping components 41, which are arranged opposite to each other and located on both sides of the lower crossbeam pad 31. One end of the two damping components 41 is used to connect to the lower crossbeam pad 31, and the other end is used to connect to the lower side of the main beam 2.

[0038] In this embodiment, the structure of the damping mechanism 4 is specifically described. The damping mechanism 4 includes two damping components 41, which are arranged opposite to each other and located on both sides of the lower crossbeam pad 31. One end of the two damping components 41 is used to connect to the lower crossbeam pad 31, and the other end is used to connect to the lower side of the main beam 2. By arranging the damping components 41 on both sides of the lower crossbeam pad 31, both sides play a damping role at the same time. When the longitudinal constraint mechanism 1 is released from consolidation, the main beam 2 can be stabilized quickly and with better stability.

[0039] like Figure 3As shown, in some optional embodiments, the longitudinal restraint assembly 11 includes a plurality of restraint hydraulic rods 111 arranged laterally at intervals, and the damping assembly 41 includes two dampers 411 arranged laterally at intervals. Both the dampers 411 and the restraint hydraulic rods 111 are arranged longitudinally, with one end for connecting to the lower crossbeam pad 31 and the other end for connecting to the main beam 2. The restraint hydraulic rods 111 located on the same side of the lower crossbeam pad 31 are all located between the two dampers 411 on the same side.

[0040] In this embodiment, the specific structures of the longitudinal restraint component 11 and the damping component 41 are described. The longitudinal restraint component 11 includes a plurality of restraint hydraulic rods 111 arranged laterally at intervals. The damping component 41 includes two dampers 411 arranged laterally at intervals. Both the dampers 411 and the restraint hydraulic rods 111 are arranged longitudinally, with one end for connecting to the lower crossbeam pad 31 and the other end for connecting to the main beam 2. The restraint hydraulic rods 111 located on the same side of the lower crossbeam pad 31 are all located between the two dampers 411 on the same side, which ensures the structural stability in the consolidated state. At the same time, the main beam 2 can be quickly stabilized when the consolidation is released, resulting in better stability.

[0041] like Figure 1 , Figure 2 and Figure 3 As shown, in some optional embodiments, a connecting mechanism 5 is also included. The connecting mechanism 5 is used to be set on the lower side of the main beam 2. The connecting mechanism 5 is provided on both sides of the lower crossbeam pad 31 in the longitudinal direction. The other end of the damper 411 and the constraint hydraulic rod 111 are connected to the main beam 2 through the connecting mechanism 5.

[0042] In this embodiment, the longitudinal restraint device for the bridge also includes a connecting mechanism 5. The connecting mechanism 5 is installed on the lower side of the main beam 2. Both sides of the lower crossbeam pad 31 in the longitudinal direction are provided with the connecting mechanism 5. The other ends of the damper 411 and the restraint hydraulic rod 111 are connected to the main beam 2 through the connecting mechanism 5, making the connection more convenient.

[0043] In this example, the connection points of the damper 411 and the restraining hydraulic rod 111 on the connecting mechanism 5, and the connection points on the lower crossbeam pad 31, are at the same height.

[0044] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, on the other hand, this application also provides a longitudinal restraint method for bridges, which is implemented using the aforementioned longitudinal restraint device for bridges, and includes the following steps: Obtain the temperature change value and the magnitude of the longitudinal constraint force within a set time period; Determine whether the temperature change value within the set time period exceeds the change threshold, and whether the magnitude of the longitudinal constraint force exceeds the design threshold; When the temperature change exceeds the change threshold within a set time period, or the magnitude of the longitudinal constraint force exceeds the design threshold, the longitudinal constraint mechanism 1 is adjusted to the released state so that the main beam 2 can move relative to the main tower 3.

[0045] When installing this longitudinal restraint device for bridges, the longitudinal restraint mechanism 1 is positioned between the main beam 2 and the main tower 3, and is used to connect with both the main beam 2 and the main tower 3. The longitudinal restraint mechanism 1 is used to relatively fix the main beam 2 and the main tower 3, or to allow the main beam 2 to move relative to the main tower 3. The damping mechanism 4 is connected to both the main beam 2 and the main tower 3, providing damping when the main beam 2 and the main tower 3 move relative to each other. Under normal circumstances, the longitudinal restraint mechanism 1 relatively fixes the main beam 2 and the main tower 3. During use, the temperature change value and the magnitude of the longitudinal restraint force are acquired within a set time period; it is determined whether the temperature change value within the set time period exceeds the change threshold, and whether the magnitude of the longitudinal restraint force exceeds the design threshold; when the temperature change value within the set time period exceeds the change threshold, or the magnitude of the longitudinal restraint force exceeds the design threshold, the longitudinal restraint mechanism 1 is adjusted to the released state, allowing the main beam 2 to move relative to the main tower 3. Under normal circumstances, the structural integrity advantage brought by the tower-beam fixed connection is maintained. When the main beam 2 needs to move relative to the main tower 3, the fixed connection can be released, which can easily release the longitudinal internal force. At the moment the longitudinal constraint is released, the damping mechanism 4 can absorb the energy generated by the relative displacement and quickly stabilize the structure. At the same time, it provides additional energy dissipation capacity under extreme loads (such as earthquakes). This solves the problem that the longitudinal movable support loses the structural integrity advantage brought by the tower-beam fixed connection in the existing technology, and the movable support with large displacement has a large amount of sliding during operation, resulting in serious wear and poor durability.

[0046] In some optional embodiments, after the longitudinal constraint mechanism 1 is adjusted to allow the main beam 2 to move relative to the main tower 3, the method further includes: Obtain the relative displacement change rate between the main beam 2 and the main tower 3, and determine whether the relative displacement change rate between the main beam 2 and the main tower 3 is greater than the rate change threshold. Based on the difference between the relative displacement change rate of the main beam 2 and the main tower 3 and the rate change threshold, the longitudinal constraint mechanism 1 is adjusted.

[0047] In this embodiment, after adjusting the longitudinal constraint mechanism 1 to allow the main beam 2 to move relative to the main tower 3, the method further includes acquiring the relative displacement change rate between the main beam 2 and the main tower 3, determining whether the relative displacement change rate between the main beam 2 and the main tower 3 is greater than the rate change threshold, and adjusting the longitudinal constraint mechanism 1 based on the difference between the relative displacement change rate between the main beam 2 and the main tower 3 and the rate change threshold. The difference between the relative displacement change rate between the main beam 2 and the main tower 3 and the rate change threshold essentially reflects the relationship between the rate change threshold and the relative displacement change rate between the main beam 2 and the main tower 3, facilitating the adjustment of the longitudinal constraint mechanism 1.

[0048] In some optional embodiments, adjusting the longitudinal constraint mechanism 1 based on the difference between the relative displacement rate of the main beam 2 and the main tower 3 and the rate change threshold includes: If the relative displacement change rate between the main beam 2 and the main tower 3 is less than or equal to the rate change threshold, the longitudinal constraint mechanism 1 is adjusted to fix the main beam 2 and the main tower 3 relatively. If the relative displacement rate between the main beam 2 and the main tower 3 is greater than the rate change threshold, the longitudinal constraint mechanism 1 remains in the released state until the relative displacement rate between the main beam 2 and the main tower 3 is less than or equal to the rate change threshold.

[0049] In this embodiment, adjusting the longitudinal constraint mechanism 1 based on the difference between the relative displacement change rate of the main beam 2 and the main tower 3 and the rate change threshold specifically includes: if the relative displacement change rate of the main beam 2 and the main tower 3 is less than or equal to the rate change threshold, adjusting the longitudinal constraint mechanism 1 to relatively fix the main beam 2 and the main tower 3; if the relative displacement change rate of the main beam 2 and the main tower 3 is greater than the rate change threshold, the longitudinal constraint mechanism 1 remains in the released state until the relative displacement change rate of the main beam 2 and the main tower 3 is less than or equal to the rate change threshold, and the relative displacement change rate of the main beam 2 and the main tower 3 is gradually reduced by the damping mechanism 4, which facilitates the adjustment of the longitudinal constraint mechanism 1 and can prevent premature consolidation recovery from causing excessive stress again.

[0050] In some optional embodiments, when the relative displacement rate between the main beam 2 and the main tower 3 is less than or equal to a rate change threshold, the method further includes: Determine if an early warning of an extreme load event has occurred; If this does not occur, adjust the longitudinal constraint mechanism 1 to fix the main beam 2 and the main tower 3 relative to each other; If this occurs, the longitudinal constraint mechanism 1 remains in the released state until the extreme load event warning time ends, at which point the longitudinal constraint mechanism 1 is adjusted to be relatively fixed to the main beam 2 and the main tower 3.

[0051] In this embodiment, when the relative displacement change rate between the main beam 2 and the main tower 3 is less than or equal to the rate change threshold, the method further includes determining whether an extreme load event warning has occurred. If no warning has occurred, the longitudinal constraint mechanism 1 is adjusted to relatively fix the main beam 2 and the main tower 3. If a warning has occurred, the longitudinal constraint mechanism 1 remains in the released state until the extreme load event warning time ends. Adjusting the longitudinal constraint mechanism 1 to relatively fix the main beam 2 and the main tower 3 can prevent extreme load events from damaging the longitudinal constraint mechanism 1, resulting in better stability.

[0052] In some optional embodiments, the longitudinal restraint mechanism 1 is also switched to the released state in the event of a power outage or hydraulic oil leakage failure.

[0053] In this embodiment, when a power outage or hydraulic oil leakage occurs, the longitudinal restraint mechanism 1 switches to the released state, which can prevent the bridge structure from becoming unstable and improve safety.

[0054] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0055] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0056] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A longitudinal constraint method for bridges, characterized in that, include: Obtain the temperature change value and the magnitude of the longitudinal constraint force within a set time period; Determine whether the temperature change value within the set time period exceeds the change threshold, and whether the magnitude of the longitudinal constraint force exceeds the design threshold; When the temperature change value exceeds the change threshold within the set time period, or the magnitude of the longitudinal constraint force exceeds the design threshold, adjust the longitudinal constraint mechanism (1) to the released state so that the main beam (2) can move relative to the main tower (3); The longitudinal constraint mechanism (1) is used to be disposed between the main beam (2) and the main tower (3) and to be connected to the main beam (2) and the main tower (3). The longitudinal constraint mechanism (1) is used to fix the main beam (2) and the main tower (3) relatively, or to allow the main beam (2) to move relative to the main tower (3). A damping mechanism (4) is used to connect to the main beam (2) and the main tower (3) respectively, and provides damping when the main beam (2) and the main tower (3) move relative to each other.

2. The longitudinal constraint method for bridges as described in claim 1, characterized in that, The longitudinal constraint mechanism (1) includes two longitudinal constraint components (11). The two longitudinal constraint components (11) are arranged opposite to each other and are located on both sides of the lower crossbeam pad (31) at the upper end of the main tower (3). One end of the two longitudinal constraint components (11) is used to connect with the lower crossbeam pad (31), and the other end is used to connect with the lower side of the main beam (2).

3. The longitudinal constraint method for bridges as described in claim 2, characterized in that, The damping mechanism (4) includes two damping components (41), which are arranged opposite to each other and located on both sides of the lower crossbeam pad (31). One end of the two damping components (41) is used to connect with the lower crossbeam pad (31), and the other end is used to connect with the lower side of the main beam (2).

4. The longitudinal constraint method for bridges as described in claim 3, characterized in that, The longitudinal constraint assembly (11) includes a plurality of constraint hydraulic rods (111) arranged at transverse intervals, and the damping assembly (41) includes two dampers (411) arranged at transverse intervals. Both the dampers (411) and the constraint hydraulic rods (111) are arranged longitudinally, with one end for connecting to the lower crossbeam pad (31) and the other end for connecting to the main beam (2). The constraint hydraulic rods (111) located on the same side of the lower crossbeam pad (31) are located between the two dampers (411) on the same side.

5. A longitudinal constraint method for bridges as described in claim 4, characterized in that, It also includes a connecting mechanism (5), which is used to be installed on the lower side of the main beam (2). The connecting mechanism (5) is provided on both sides of the lower crossbeam pad (31) in the longitudinal direction. The other end of the damper (411) and the constraint hydraulic rod (111) are connected to the main beam (2) through the connecting mechanism (5).

6. A longitudinal constraint method for bridges as described in claim 1, characterized in that, After adjusting the longitudinal constraint mechanism (1) to the released state so that the main beam (2) can move relative to the main tower (3), the following is also included: Obtain the relative displacement change rate between the main beam (2) and the main tower (3), and determine whether the relative displacement change rate between the main beam (2) and the main tower (3) is greater than the rate change threshold. Based on the difference between the relative displacement change rate of the main beam (2) and the main tower (3) and the rate change threshold, the longitudinal constraint mechanism (1) is adjusted.

7. A longitudinal constraint method for bridges as described in claim 6, characterized in that, The method of adjusting the longitudinal constraint mechanism (1) based on the difference between the relative displacement rate of the main beam (2) and the main tower (3) and the rate change threshold includes: If the relative displacement change rate of the main beam (2) and the main tower (3) is less than or equal to the rate change threshold, adjust the longitudinal constraint mechanism (1) to fix the main beam (2) and the main tower (3) relatively. If the relative displacement rate of the main beam (2) and the main tower (3) is greater than the rate change threshold, the longitudinal constraint mechanism (1) remains in the released state until the relative displacement rate of the main beam (2) and the main tower (3) is less than or equal to the rate change threshold.

8. A longitudinal constraint method for bridges as described in claim 7, characterized in that, When the relative displacement rate between the main beam (2) and the main tower (3) is less than or equal to the rate change threshold, it also includes: Determine if an early warning of an extreme load event has occurred; If not, adjust the longitudinal constraint mechanism (1) to fix the main beam (2) and the main tower (3) relative to each other. If this occurs, the longitudinal constraint mechanism (1) remains in the released state until the extreme load event warning time ends, and the longitudinal constraint mechanism (1) is adjusted to fix the main beam (2) and the main tower (3) relative to each other.

9. A longitudinal constraint method for bridges as described in claim 1, characterized in that, Also includes: When a power outage or hydraulic oil leakage occurs, the longitudinal restraint mechanism (1) switches to the released state.

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