Bridge seamless expansion joint device and expansion joint monitoring method

Abstract

The invention discloses a bridge seamless expansion joint device and an expansion joint monitoring method.The bridge seamless expansion joint device comprises a pair of anchoring assemblies, a rotating shaft, a gear, multiple sets of deflectable connecting rod assemblies, a sliding rod, an adjusting rod and the like which are installed in a bridge expansion joint, and the adjusting rod is driven by deflection of the deflectable connecting rod assemblies to do lifting motion; a movable plate is connected to the upper portion of the adjusting rod, a slidable elastic layer is arranged on the upper portion of the movable plate, and the elastic layer is used for being arranged at the expansion joint and connected with the bridge. When the width of the bridge expansion joint changes due to the influence of factors such as concrete shrinkage and creep, temperature and vehicle load, the device can be matched with the deflectable connecting rod assembly to jack up the elastic layer sunken towards the interior of the expansion joint in a self-adaptive mode through the bridge end portion movement, or pull down the elastic layer protruding out of the bridge end portion in an arched mode. The elastic layer can be always kept basically flat with the end part of the bridge, and the problem that the stable passing of vehicles is influenced by the formation of bulges or recesses or discontinuity and the like is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to a bridge seamless expansion joint device and an expansion joint monitoring method. Background Art

[0002] As an important part of transportation construction, bridges must ensure that the road surface is flat, strong and safe. Expansion joints are usually set between the two beam ends, between the beam ends and the abutments, or at the transverse hinges of the bridge. They play a role in regulating the displacement and connection between the superstructures caused by concrete shrinkage and creep, temperature and vehicle loads. Expansion joints should be able to expand and contract freely in two directions parallel and perpendicular to the bridge axis, be strong and reliable, so that vehicles on the bridge can run smoothly without sudden jumps and noise. They should be able to prevent rainwater and garbage soil from seeping in and clogging, and be simple and convenient to install, inspect, maintain and remove dirt.

[0003] Existing seamless expansion joint devices generally fill the expansion joint reserved between the two ends of the bridge with wear- and corrosion-resistant elastic material, and fix the two ends of the elastic material to the adjacent ends of the two bridges respectively. However, when the width of the expansion joint of the bridge changes due to factors such as concrete shrinkage creep or temperature, the elastic material is deformed by compression or pulling, and is prone to forming bulges or depressions (for example, when the width of the expansion joint decreases, the middle section of the elastic material may arch upward; when the width of the expansion joint increases, the elastic material is stretched and its thickness becomes thinner, forming a depression), resulting in the expansion joint position being uneven with the height of the bridge end, affecting the smooth passage of vehicles. Summary of the Invention

[0004] The purpose of the present invention is to provide a bridge seamless expansion joint device and an expansion joint monitoring method in response to the problems existing in the prior art.

[0005] To achieve the above object, the technical solution adopted by the present invention is: A seamless expansion joint device for a bridge comprises a pair of anchor assemblies installed in the expansion joint of the bridge, a pair of parallel rotating shafts are provided between the pair of anchor assemblies, at least one end of each of the rotating shafts is provided with a gear, and the gears on the pair of rotating shafts are meshed and connected to each other; a plurality of groups of deflectable link assemblies are provided at intervals on the rotating shafts, one end of each group of the deflectable link assemblies is respectively connected to a sliding rod, the sliding rod is connected to a connecting plate to be connected to the end face of the bridge at the expansion joint, and the other end of each group of the deflectable link assemblies is respectively connected to a slidable adjustment rod, the adjustment rod performs lifting and lowering movement driven by the deflection of the deflectable link assembly, a movable plate is connected above the adjusting rod, a sliding elastic layer is provided above the movable plate, and the elastic layer is used to be arranged at the expansion joint and connected to the bridge.

[0006] The seamless expansion joint device of the bridge is arranged in the expansion joint of the bridge. When the width of the expansion joint of the bridge is affected by factors such as concrete shrinkage creep, temperature and vehicle load, the elastic layer that is recessed into the expansion joint can be adaptively pushed up, or the elastic layer that is arched and protrudes from the end of the bridge can be pulled downward by the displacement of the bridge end, so that the elastic layer can always remain basically flat with the end of the bridge, and the problem of the existing seamless expansion joint device easily forming bulges or depressions or discontinuities when the size of the expansion joint changes, thereby affecting the smooth passage of vehicles, can be avoided as much as possible.

[0007] Furthermore, the anchoring assembly includes a supporting base plate, a waist-shaped hole is provided on the supporting base plate, and anchor nails are provided in the waist-shaped hole. The anchor nails are used to connect the bridge piers below the expansion joint; a pair of supporting vertical plates are provided on the supporting base plate, and the supporting vertical plates support and can be rotatably connected to the rotating shaft.

[0008] Furthermore, the deflectable link assembly includes a fixed ring mounted on the rotating shaft, and a first link and a second link are provided on the fixed ring, and the first link and the second link have an angle of not less than 90 degrees, the first link is arranged at an angle and connected to the sliding rod, and the second link is connected to the adjusting rod.

[0009] Furthermore, a slidable vertical sleeve is provided on the slide rod, and the vertical sleeve is rotatably connected to the end of the first connecting rod; a horizontal sleeve is provided on the adjustment rod, and the horizontal sleeve is rotatably connected to the end of the second connecting rod.

[0010] Furthermore, both ends of the adjusting rod are bent upward to form a U-shaped structure, the lower surface of the movable plate is fixed to the upward bent end of the adjusting rod, and one end of the deflectable connecting rod assembly is slidably connected to the horizontal section of the adjusting rod.

[0011] Furthermore, the movable plate is in a rectangular plate-like structure, the length of the movable plate is set according to the length of the expansion joint of the bridge, and a gap is left between the two sides of the movable plate in the width direction and the end of the bridge.

[0012] Furthermore, a plurality of T-shaped sliders are integrally formed on the upper surface of the movable plate, and the plurality of T-shaped sliders are equidistantly distributed in the length direction of the movable plate, and each of the T-shaped sliders is arranged along the width direction of the movable plate; a T-shaped groove which is arranged in alignment with the T-shaped slider is provided at the bottom of the elastic layer, and the elastic layer is slidably connected to the movable plate through the T-shaped groove and the T-shaped slider.

[0013] Furthermore, the elastic layer has a multi-layer structure, and a memory metal mesh arranged in a wave shape is compounded between the multiple elastic layers; the elastic layer located on the top layer is made of modified polyurethane material, and both sides of the elastic layer are provided with a step-shaped notch, and a transition zone is formed between the top of the notch and the end face of the bridge at the expansion joint, and the transition zone is filled with steel fiber concrete.

[0014] Furthermore, a pair of the rotating shafts are also provided with mounting seats rotatably connected to the rotating shafts, and a data transmitter and a displacement sensor are installed on the mounting seats. The displacement sensor is electrically connected to the data transmitter, and the displacement sensor is set toward the end face of the bridge; a stress strain gauge is also provided on the movable plate, and the stress strain gauge is also electrically connected to the data transmitter.

[0015] A method for monitoring an expansion joint of a seamless expansion joint device of a bridge, the method comprising the following steps: When the bridge is displaced due to load, causing the width of the expansion joint of the bridge to change, the deflectable link assembly automatically deflects according to the change in the width of the joint to lift or lower the movable plate; The displacement sensor monitors the displacement data between the rotating shaft and the end face of the bridge in real time, and transmits the displacement data to the monitoring terminal via the data transmitter. The monitoring terminal compares the displacement data with a preset displacement threshold. If the displacement data is less than or equal to the displacement threshold, the seamless telescopic device is adaptively controlled. If the displacement data exceeds the displacement threshold, an automatic warning is issued (for example, a sudden increase of 30% in displacement triggers maintenance). The stress strain gauge monitors the pressure data borne by the movable plate at this time in real time. The pressure data is transmitted to the monitoring terminal through the data transmitter. The monitoring terminal determines whether the movable plate and the elastic layer are normally fitted according to the pressure data, and monitors whether there is abnormal force.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The seamless expansion joint device of the bridge is arranged in the expansion joint of the bridge. When the width of the expansion joint of the bridge is affected by factors such as concrete shrinkage creep, temperature and vehicle load, the elastic layer that is recessed into the expansion joint can be pushed up or the elastic layer that is arched and protrudes from the end of the bridge can be pulled downward by the displacement of the bridge end, so that the elastic layer can always remain basically flat with the end of the bridge, and the problem of the existing seamless expansion joint device easily forming bulges or depressions or discontinuities when the size of the expansion joint changes, thereby affecting the smooth passage of vehicles; 2. Through the setting of the deflectable link assembly, the displacement of the bridge can be sensed in real time and adaptively deflected according to the displacement change, thereby adjusting the height of the movable plate supported by it to compensate for the deformation of the elastic layer caused by the change in the size of the expansion joint, so that the elastic layer can always maintain a stable supporting effect, which is beneficial to the smooth passage of vehicles above the bridge and can also extend the elastic layer and the entire The service life of the device; 3. When the expansion joint of the bridge increases and the elastic layer is stretched and thinned, the second connecting rod rotates upward to push the movable plate installed on the adjusting rod to move up, and the elastic layer is lifted up from the bottom to adapt to the height, so as to avoid the elastic layer from being stretched and thinned, resulting in a depression above the expansion joint; when the expansion joint of the bridge decreases and the two ends of the bridge displace toward each other to squeeze the elastic layer, the second connecting rod rotates downward, and the connection relationship between the movable plate and the elastic layer is used to pull the elastic layer downward to adapt to the height, so as to prevent the elastic layer from being squeezed and arched in the middle section to form a bulge above the expansion joint; 4. The displacement sensor can detect the displacement of the bridge end caused by factors such as concrete shrinkage creep, temperature and vehicle load, which is convenient for long-term monitoring of the bridge expansion joint; the stress strain gauge monitors the pressure data borne by the movable plate in real time, and judges whether the movable plate and the elastic layer are normally fitted according to the pressure data, and monitors whether there is abnormal stress; by monitoring the expansion joint, the purpose of timely detection and timely repair can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a seamless expansion joint device for a bridge according to the present invention; Figure 2 Schematic diagram of the arrangement structure of the movable plate and T-shaped slider of the present invention; Figure 3 This is a schematic diagram of the installation structure of the fixing ring, the first connecting rod and the second connecting rod of the present invention; Figure 4 This invention Figure 3 A magnified view of the bottom details; Figure 5 Schematic diagram of the connection structure of the vertical sliding sleeve and the horizontal sliding sleeve of the present invention; Figure 6This is a schematic diagram of the installation position of the memory metal mesh of the present invention; Figure 7 Schematic diagram of the connection structure between the movable plate and the slide seat in Example 3 of the present invention; In the figure: 1. Anchor assembly; 101. Support base plate; 102. Support vertical plate; 2. Waist-shaped hole; 3. Anchor nail; 4. Rotating shaft; 5. Gear; 6. Fixed ring; 7. First connecting rod; 8. Second connecting rod; 9. Receiving groove; 10. Vertical sliding sleeve; 11. Horizontal sliding sleeve; 12. Sliding rod; 13. Connecting plate; 14. Mounting hole; 15. Adjusting rod; 16. Movable plate; 17. T-shaped slider; 18. Elastic layer; 19. T-shaped slide groove; 20. Notch; 21. Memory metal mesh; 22. Data transmitter; 23. Displacement sensor; 24. Mounting seat; 1601. Sliding hole; 1602. Spring; 1603. Supporting sliding rod; 1604. Sliding seat. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Example 1

[0020] like Figures 1 to 6As shown, a seamless expansion joint device for a bridge includes a pair of anchor assemblies 1 installed in the expansion joint of the bridge, a pair of parallel rotating shafts 4 are provided between the pair of anchor assemblies 1, at least one end of each rotating shaft 4 is provided with a gear 5, and the gears 5 on the pair of rotating shafts 4 are meshed and connected with each other; a plurality of groups of deflectable link assemblies are provided at intervals on the rotating shaft 4, one end of each group of the deflectable link assemblies is respectively connected to a sliding rod 12, and the sliding rod 12 is connected to a connecting plate 13 to be connected to the end face of the bridge at the expansion joint, and the other end of each group of the deflectable link assemblies is respectively connected to a slidable adjustment rod 15, and the adjustment rod 15 is driven to move up and down by the deflection of the deflectable link assembly, and a movable plate 16 is connected above the adjusting rod 15, and a sliding elastic layer 18 is provided above the movable plate 16, and the elastic layer 18 is used to be arranged at the expansion joint and connected to the bridge.

[0021] This seamless expansion joint device for bridge is arranged in the expansion joint of the bridge. When the width of the expansion joint of the bridge is affected by factors such as concrete shrinkage creep, temperature and vehicle load, the elastic layer 18 that is recessed into the expansion joint can be adaptively pushed up by cooperating with the deflectable connecting rod assembly through the displacement of the bridge end, or the elastic layer 18 that is arched and protrudes from the bridge end can be pulled downward, so that the elastic layer 18 can always remain basically flat with the bridge end, and the problem of existing seamless expansion joint devices that easily form bulges or depressions or discontinuities when the expansion joint size changes, thereby affecting the smooth passage of vehicles, can be avoided as much as possible.

[0022] The setting of the anchoring assembly 1 enables the entire device to be installed in the expansion joint of the bridge, and the elastic layer 18 can just cover the expansion joint of the bridge and remain flush with the bridge deck; through the setting of the deflectable connecting rod assembly, the displacement generated by the bridge can be sensed in real time and adaptively deflected according to the displacement change, thereby adjusting the height of the movable plate 16 it supports to compensate for the deformation of the elastic layer 18 caused by the change in the size of the expansion joint, so that the elastic layer 18 can always maintain a stable supporting effect, which is beneficial to the smooth passage of vehicles above the bridge and can also extend the service life of the elastic layer and the entire device.

[0023] The setting of the pair of rotating shafts 4 not only plays a supporting role in the length direction, supporting the deflectable link assembly, adjustment rod and movable plate above it, but also enables the deflectable link assembly to rotate relative to the anchor assembly, so that the deflectable link assembly can deflect (rotate at a small angle) when subjected to external force, and convert the horizontal displacement of the bridge into the vertical displacement of the movable plate; at the same time, under the action of the deflectable link assembly, the rotating shafts will also rotate synchronously, and under the meshing connection of a pair of gears, the pair of rotating shafts can rotate synchronously in opposite directions.

[0024] Furthermore, the anchoring assembly 1 includes a supporting base plate 101, which is provided with a waist-shaped hole 2, and an anchor 3 is provided in the waist-shaped hole 2, and the anchor 3 is used to connect the bridge pier below the expansion joint; the supporting base plate 101 is provided with a pair of supporting vertical plates 102, and the supporting vertical plates 102 support and are rotatably connected to the rotating shaft 4.

[0025] The anchor 3 is movably passed through the waist-shaped hole 2. The length of the waist-shaped hole 2 is greater than the diameter of the anchor 3. The bottom end of the anchor 3 is fixed to the pier below the expansion joint of the bridge to limit the support base plate 101. At the same time, when the anchor assembly 1 is subjected to lateral tension, the entire support base plate and the support vertical plate can also produce adaptive displacement along the length direction of the waist-shaped hole 2.

[0026] Further, combined Figure 5 As shown, the deflectable link assembly includes a fixing ring 6 sleeved on the rotating shaft 4, and a first link 7 and a second link 8 are provided on the fixing ring 6. The first link 7 and the second link 8 have an angle of not less than 90 degrees. The first link 7 is arranged at an angle and connected to the sliding rod 12, and the second link 8 is connected to the adjusting rod 15.

[0027] By setting the fixing ring 6 and the first connecting rod 7 and the second connecting rod 8 above it, the first connecting rod 7 will be displaced when subjected to a lateral force, so that the second connecting rod 8 will also be displaced. At the same time, the rotating shaft 4 connected to the fixing ring is synchronously generated, further improving the synchronization of the synchronous rotation of all deflectable connecting rod assemblies on a pair of the rotating shafts, so as to simultaneously apply an adjusting force to the adjusting rod, so that the entire movable plate can be raised and lowered smoothly.

[0028] At least three groups of the deflectable connecting rod assemblies are arranged at equal intervals on a pair of the rotating shafts 4, and each group is provided with a pair of symmetrical deflectable connecting rod assemblies.

[0029] Furthermore, a slidable vertical sleeve 10 is sleeved on the slide rod 12, and the vertical sleeve 10 is rotatably connected to the end of the first connecting rod 7; a horizontal sleeve 11 is provided on the adjustment rod 15, and the horizontal sleeve 11 is rotatably connected to the end of the second connecting rod 8.

[0030] Through such an arrangement, in conjunction with the deflectable connecting rod assembly, the displacement of the sliding rod and the connecting plate can be converted into the displacement of the horizontal sliding sleeve, thereby driving the adjustment rod to move.

[0031] Specifically, the support vertical plate 102 is rotatably connected to two parallel rotating shafts 4, and the ends of the telescopic rotating shafts 4 are fixedly sleeved with the gears 5. The gears 5 installed on the two rotating shafts 4 are meshed with each other. Since multiple groups of the gears 5 are meshed with each other, when one of the rotating shafts 4 rotates, the linkage action of the gears 5 can drive the other rotating shaft 4 to rotate synchronously in the opposite direction. The middle sections of the two rotating shafts 4 are fixedly sleeved with the fixing ring 6. The first connecting rod 7 arranged obliquely is connected to the side of the fixing ring 6 close to the bridge end. The second connecting rod 8 is fixedly connected to the upper surface of the fixing ring 6. The ends of the first connecting rod 7 and the second connecting rod 8 away from the fixing ring 6 are each provided with an accommodating groove 9. The ends of the first connecting rod 7 and the second connecting rod 8 away from the fixing ring 6 are respectively rotatably connected to the vertical sliding sleeve 10 and the horizontal sliding sleeve 11. The vertical sliding sleeve 10 and the horizontal sliding sleeve 11 are respectively installed in the corresponding accommodating grooves 9; A sliding rod 12 fixed to the end of the bridge is slidably penetrated in the vertical sliding sleeve 10, and a connecting plate 13 is welded and fixed to the end of the sliding sleeve 12. A mounting hole 14 is opened on the connecting plate 13, and the connecting plate 13 is screwed and fixed to the end of the bridge with external bolts through the mounting hole 14. Since the side wall of the vertical sliding sleeve 10 is rotatably connected to the end of the first connecting rod 7 away from the fixing ring 6, and the vertical sliding sleeve 10 can slide along the end of the sliding rod 12, when the two ends of the bridge are displaced in reverse due to the shrinkage creep of concrete, temperature or vehicle load, resulting in the increase of the expansion joint of the bridge, the displacement of the bridge end will be The vertical sliding sleeve 10 slides along the sliding rod 12 in cooperation with the traction action of the first connecting rod 7, causing the two rotating shafts 4 meshed by the gears 5 to rotate in opposite directions. At this time, the second connecting rod 8 connected to the fixed ring 6 produces a linked upward rotation. When the two ends of the bridge are displaced toward each other due to concrete shrinkage creep, temperature or vehicle load, resulting in a reduction in the expansion joint of the bridge, the displacement of the ends of the bridge will be caused by the vertical sliding sleeve 10 sliding along the sliding rod 12 in cooperation with the pushing action of the first connecting rod 7, causing the two rotating shafts 4 meshed by the gears 5 to rotate toward each other. At this time, the second connecting rod 8 connected to the fixed ring 6 produces a linked downward rotation.

[0032] The horizontal sliding sleeve 11 is slidably mounted on the horizontal section of the adjusting rod 15. When the second connecting rod 8 rotates upward, the horizontal sliding sleeve 11 slides on the horizontal section of the adjusting rod 15 to push the movable plate 16 upward. When the second connecting rod 8 rotates downward, the horizontal sliding sleeve 11 slides on the adjusting rod 15 to pull the movable plate 16 downward. When the expansion joint of the bridge increases, the elastic layer 18 is stretched and thinned, and the second connecting rod 8 rotates upward to push the movable plate 16 mounted on the adjusting rod 15 upward, thereby lifting the elastic layer 18 upward from below to adjust the height, so as to prevent the elastic layer 18 from forming a depression above the expansion joint due to the stretching and thinning. When the expansion joint of the bridge is reduced and the two ends of the bridge displace toward each other to squeeze the elastic layer 18, the second connecting rod 8 rotates downward, and the connection between the movable plate and the elastic layer is used to pull the elastic layer 18 downward to adapt to the height, so as to prevent the elastic layer 18 from forming a bulge above the expansion joint due to the arching of the middle section due to extrusion.

[0033] Furthermore, both ends of the adjusting rod 15 are bent upward to form a U-shaped structure, the lower surface of the movable plate 16 is fixed to the upward bent end of the adjusting rod 15, and the second connecting rod 8 of the deflectable connecting rod assembly is slidably connected to the horizontal section of the adjusting rod 15.

[0034] Furthermore, the movable plate 16 is a rectangular plate structure, the length of the movable plate 16 is set according to the length of the bridge expansion joint, and a gap is left between the two sides of the movable plate 16 in the width direction and the end of the bridge.

[0035] An adjusting rod 15 is slidably provided in the horizontal sliding sleeve 11, and both ends of the adjusting rod 15 are bent upward to form a U-shaped structure. A movable plate 16 is fixedly connected to the end of the adjusting rod 15. The movable plate 16 is a rectangular plate structure. The length of the movable plate 16 is set according to the length of the expansion joint of the bridge. A gap is left between the two sides of the movable plate 16 and the end of the bridge to avoid the expansion joint reserved between the ends of the bridge from being squeezed with the movable plate 16 when shrinking, which may cause the movable plate 16 to be damaged due to extrusion deformation.

[0036] Furthermore, a plurality of T-shaped sliders 17 are integrally formed on the upper surface of the movable plate 16, and the plurality of T-shaped sliders 17 are equidistantly distributed in the length direction of the movable plate 16, and each of the T-shaped sliders 17 is arranged along the width direction of the movable plate 16; a T-shaped groove 19 is provided at the bottom of the elastic layer 18, which is arranged in alignment with the T-shaped slider 17, and the elastic layer 18 is slidably connected to the movable plate 16 through the T-shaped groove 19 and the T-shaped slider 17.

[0037] By cooperating with the T-shaped slider 17 and the T-shaped slot 19, the movable plate 16 can be connected to the elastic layer 18, and the elastic layer 18 can slide relative to the width direction of the movable plate 16 without affecting the extension or extrusion of the elastic layer 18 in the width direction, so that it can adapt to the size change of the expansion joint. At the same time, the movable plate 16 can always form a support underneath it to prevent the elastic layer from being concave or convex.

[0038] Furthermore, the elastic layer 18 is a multi-layer structure, and a wave-shaped memory metal mesh 21 is compounded between the multiple elastic layers 18 to increase the strength of the elastic layer 18 and greatly improve the service life of the elastic layer 18.

[0039] The topmost elastic layer 18 is made of modified polyurethane. Stepped notches 20 are provided on both sides of the elastic layer. A transition zone is formed between the notches 20 and the bridge's end face at the expansion joint. This transition zone is filled with steel fiber reinforced concrete. The steel fiber reinforced concrete seals the transition zone. The stepped notches 20 significantly increase the contact surface between the elastic layer 18 and the steel fiber reinforced concrete, enhancing the stability of the connection.

[0040] When the seamless expansion joint device of the bridge is in use, the anchor assembly 1 is fixed to the pier below the expansion joint of the bridge through the anchor nail 3 and the waist-shaped hole 2. Since the two anchor assemblies 1 are connected by rotating the two shafts 4, the two shafts 4 are meshed and connected by the gear 5. The middle section of the shaft 4 is fixed with a fixing ring 6. The fixing ring 6 is connected with the first connecting rod 7 and the second connecting rod 8. The first connecting rod 7 is fixed to the end of the bridge through the vertical sliding sleeve 10 and the sliding rod 12. The second connecting rod 8 is slidably connected to the elastic layer 18 through the horizontal sliding sleeve 11 and the adjusting rod 15 and the movable plate 16. When the bridge produces reverse displacement due to concrete shrinkage creep, temperature and vehicle load, the expansion joint of the bridge increases, which will pull the elastic layer 18 to stretch and become thinner. At the same time, the first connecting rod 7 is pulled by the traction of the bridge end. The dynamic shaft 4 rotates, causing the second connecting rod 8 to rotate upward, pushing the movable plate 16 installed on the adjusting rod 15 to move upward, and pushing the elastic layer 18 upward from the bottom to adapt to the height, so as to prevent the elastic layer 18 from becoming thinner due to stretching, resulting in a depression above the expansion joint. When the bridge produces relative displacement, the expansion joint of the bridge is reduced and the elastic layer 18 is squeezed to arch upward. The second connecting rod 8 rotates downward, and the T-shaped slider 17 is used to cooperate with the T-shaped slide groove 19 to pull the elastic layer 18 downward to adapt to the height, so as to prevent the elastic layer 18 from forming a bulge above the expansion joint due to squeezing the middle section to arch, so that the elastic layer 18 above the expansion joint can always remain flat with the end of the bridge, and try to avoid the problem that the existing seamless expansion joint device is prone to forming bulges or depressions when the expansion joint size changes, affecting the smooth passage of vehicles. Example 2

[0041] This embodiment provides a bridge expansion joint monitoring mechanism based on the first embodiment.

[0042] Specifically, a pair of the rotating shafts 4 are also provided with mounting seats 24 rotatably connected to the rotating shafts 4, and a displacement sensor 23 and a data transmitter 22 are installed below the mounting seats 24. The displacement sensor 23 is electrically connected to the data transmitter 22, and the displacement sensor 23 is set toward the end face of the bridge; the movable plate 16 is also provided with a stress strain gauge or a pressure sensor, and the stress strain gauge or the pressure sensor is also electrically connected to the data transmitter.

[0043] The displacement sensor 23 is a fiber grating displacement sensor, and its monitoring end is aligned with the end of the bridge. It is used to monitor the displacement of the end of the bridge and transmit it to the data transmitter 22 in real time. The data transmitter 22 is an Internet of Things data acquisition instrument, which is used to transmit the monitoring data to the monitoring terminal via a wireless network, facilitating long-term monitoring of the bridge expansion joint.

[0044] The mounting base 24 can also connect to the pair of rotating shafts 4, improving their stability. The rotating shafts 4 pass through the mounting base 24, so the mounting base 24 does not rotate with the rotating shafts 4. The displacement sensor 23, the stress strain gauge, and the data transmitter 22 are connected to the outside of the bridge via cables and an external power source.

[0045] A method for monitoring an expansion joint of a seamless expansion joint device of a bridge, the method comprising the following steps: When the bridge is displaced due to load, causing the width of the expansion joint of the bridge to change, the deflectable link assembly automatically deflects according to the change in the width of the joint to lift or lower the movable plate; The displacement sensor monitors the displacement data between the rotating shaft and the end face of the bridge in real time, and transmits the displacement data to the monitoring terminal via the data transmitter. The monitoring terminal compares the displacement data with a preset displacement threshold. If the displacement data is less than or equal to the displacement threshold, the seamless telescopic device is adaptively controlled. If the displacement data exceeds the displacement threshold, an automatic warning is issued (for example, a sudden increase of 30% in displacement triggers a maintenance alarm). The stress strain gauge monitors the pressure data borne by the movable plate at this time in real time. The pressure data is transmitted to the monitoring terminal through the data transmitter. The monitoring terminal determines whether the movable plate and the elastic layer are normally fitted according to the pressure data, and monitors whether there is abnormal force.

[0046] The movement threshold can be a preset design displacement. The expansion joint displacement generated within this displacement range is acceptable. When the actual displacement exceeds the movement threshold, it may cause other safety problems, especially long-term excessive displacement. By arranging the displacement sensor on the mounting seat, the method can monitor the displacement changes at the expansion joint in real time. When the current displacement exceeds too much or for too long, an early warning can be issued to avoid increasing safety risks and also to avoid damage to the device.

[0047] By collecting pressure data, it is possible to further determine whether the movable plate effectively supports the elastic layer, ensuring that the two can work together to adapt to each other; it is also possible to monitor abnormal loads to determine whether there is a fault or a safety hazard at the expansion joint.

[0048] In some embodiments, the seamless expansion joint device is further provided with a temperature sensor, which can detect the ambient temperature at the bridge expansion joint and set the displacement threshold according to the relationship between temperature changes and thermal expansion and contraction of the material. Example 3

[0049] The difference between this embodiment and embodiment 1 is that the movable plate is in a telescopic form.

[0050] Specifically, such as Figure 7 As shown, a sliding hole 1601 is provided inside the movable plate 16, and a spring 1602 is provided in the middle section of the sliding hole 1601. Support slide rods 1603 are slidably connected in the sliding holes 1601 at both ends of the spring 1602. One end of the support slide rod 1603 located in the sliding hole 1601 is fixed to the end of the spring 1602, and the end of the support slide rod 1603 located outside the sliding hole 1601 is fixedly connected to a slide seat 1604 with a U-shaped structure. The open end of the slide seat 1604 is sleeved on the movable plate 16 and is slidably connected to the side of the movable plate 16. When the movable plate 16 is installed, the two slide seats 1604 are away from each other. One end of the spring 1602 fits with the end face of the bridge. When the spacing of the expansion joints between the end faces of the bridge changes due to creep, the spring 1602 can adaptively expand and contract to adjust the spacing between the two slides 1604, so that the two slides 1604 always fit the end of the bridge. The slide 1604 whose position can be adaptively adjusted is used to fill the gap between the end of the bridge and the movable plate 16. In conjunction with the supporting slide rod 1603, the elastic layer 18 above the gap between the end of the bridge and the movable plate 16 can be supported, and the existence of a suspended position below the elastic layer 18 can be avoided as much as possible. When the vehicle is driving, the suspended position of the elastic layer is compressed and deformed to form a depression, which affects the passage of the vehicle.

[0051] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A bridge seamless expansion joint device, characterized in that: The invention comprises a pair of anchoring assemblies installed in the expansion joint of the bridge, a pair of parallel rotating shafts are provided between the pair of anchoring assemblies, at least one end of each rotating shaft is provided with a gear, and the gears on the pair of rotating shafts are meshed and connected with each other; a plurality of groups of deflectable link assemblies are provided at intervals on the rotating shafts, one end of each group of the deflectable link assemblies is respectively connected to a sliding rod, and the sliding rod is connected to a connecting plate to be connected to the end face of the bridge at the expansion joint, and the other end of each group of the deflectable link assemblies is respectively connected to a slidable adjustment rod, and the adjustment rod performs lifting and lowering motion under the deflection of the deflectable link assembly, and a movable plate is connected above the adjusting rod, and a sliding elastic layer is provided above the movable plate, and the elastic layer is used to be arranged at the expansion joint and connected to the bridge.

2. The bridge seamless expansion joint device according to claim 1, characterized in that: The anchoring assembly includes a supporting base plate, a waist-shaped hole is provided on the supporting base plate, and an anchor is provided in the waist-shaped hole. The anchor is used to connect the bridge pier below the expansion joint; a pair of supporting vertical plates are provided on the supporting base plate, and the supporting vertical plates support and are rotatably connected to the rotating shaft.

3. The bridge seamless expansion joint device according to claim 1, characterized in that: The deflectable link assembly includes a fixed ring mounted on the rotating shaft, and a first link and a second link are provided on the fixed ring. The first link and the second link have an angle of not less than 90 degrees. The first link is arranged at an angle and connected to the sliding rod, and the second link is connected to the adjusting rod.

4. The bridge seamless expansion joint device according to claim 3, characterized in that: The slide rod is provided with a slidable vertical sleeve, and the vertical sleeve is rotatably connected to the end of the first connecting rod; the adjustment rod is provided with a horizontal sleeve, and the horizontal sleeve is rotatably connected to the end of the second connecting rod.

5. The bridge seamless expansion joint device according to claim 1, characterized in that: Both ends of the adjusting rod are bent upward to form a U-shaped structure, the lower surface of the movable plate is fixed to the upward bent end of the adjusting rod, and one end of the deflectable connecting rod assembly is slidably connected to the horizontal section of the adjusting rod.

6. The bridge seamless expansion joint device according to claim 1, characterized in that: The movable plate is in a rectangular plate-like structure. The length of the movable plate is set according to the length of the expansion joint of the bridge. A gap is left between the two sides of the movable plate in the width direction and the end of the bridge.

7. The bridge seamless expansion joint device according to claim 1, characterized in that: A plurality of T-shaped sliders are integrally formed on the upper surface of the movable plate, and the plurality of T-shaped sliders are equidistantly distributed in the length direction of the movable plate, and each of the T-shaped sliders is arranged along the width direction of the movable plate; a T-shaped groove which is arranged in alignment with the T-shaped slider is provided at the bottom of the elastic layer, and the elastic layer is slidably connected to the movable plate through the T-shaped groove and the T-shaped slider.

8. The bridge seamless expansion joint device according to claim 1, characterized in that: The elastic layer has a multi-layer structure, and a memory metal mesh arranged in a wave shape is compounded between the multiple elastic layers; the elastic layer located on the top layer is made of modified polyurethane material, and both sides of the elastic layer are provided with notches with a stepped structure. A transition zone is formed between the top of the notch and the end face of the bridge at the expansion joint, and the transition zone is filled with steel fiber concrete.

9. The bridge seamless expansion joint device according to claim 1, characterized in that: A pair of rotating shafts are also provided with mounting seats rotatably connected to the rotating shafts. A data transmitter and a displacement sensor are installed on the mounting seats. The displacement sensor is electrically connected to the data transmitter and is arranged toward the end face of the bridge. A stress strain gauge is also provided on the movable plate, and the stress strain gauge is also electrically connected to the data transmitter.

10. The expansion joint monitoring method of a bridge seamless expansion joint device according to claim 9, characterized in that: The expansion joint monitoring method comprises the following steps: When the bridge is displaced due to load, causing the width of the expansion joint of the bridge to change, the deflectable link assembly automatically deflects according to the change in the width of the joint to lift or lower the movable plate; The displacement sensor monitors the displacement data between the rotating shaft and the end face of the bridge in real time, and transmits the displacement data to the monitoring terminal via the data transmitter. The monitoring terminal compares the displacement data with a preset displacement threshold. If the displacement data is less than or equal to the displacement threshold, the seamless telescopic device is adaptively controlled. If the displacement data exceeds the displacement threshold, an automatic warning is issued. The stress strain gauge monitors the pressure data borne by the movable plate at this time in real time. The pressure data is transmitted to the monitoring terminal through the data transmitter. The monitoring terminal determines whether the movable plate and the elastic layer are normally fitted according to the pressure data, and monitors whether there is abnormal force.

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