Self-cleaved precise height-adjusting bridge support

Abstract

The application discloses a self-tapered precise height-adjusting bridge support, which is characterized by the following steps: driving the driving shaft to rotate by hand or motor, driving the driving gear to rotate by the driving shaft, driving the driven gear to rotate by the driving gear, driving the driven shaft to rotate by the driven gear, and driving the bidirectional special screw rod to move in the same direction with the driven shaft, and driving the first wedge-shaped sliding block and the second wedge-shaped sliding block of the bidirectional special screw rod to move close to or away from each other, so as to drive the lifting block to rise or fall, and thus the height of the bridge and the upper structure is changed. The transmission shaft, the gear and the wedge-shaped sliding block are linked and matched, so that the height of the bridge can be adjusted by one person, the operation is simple, time and labor are saved, the adjustment precision is high, the thread self-locking of the bidirectional special screw rod and the ring-shaped clamping locking mechanism are matched and clamped and self-locked, and the support can be stably and reliably kept at the preset height position under the long-term operation and vibration environment.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, specifically to a self-wedge type bridge bearing with precise height adjustment. Background Technology

[0002] Bridge bearings are crucial components connecting the superstructure and substructure of a bridge, playing a key role in transferring loads and accommodating deformation. During long-term bridge operation, uneven settlement often occurs in piers or foundations due to factors such as foundation settlement, concrete shrinkage and creep, or vehicle overloading. This leads to changes in the beam alignment and redistribution of internal forces, which can seriously threaten the structural safety of the bridge.

[0003] Currently, the main method for repairing bridge settlement is adjusting the height of bridge bearings. Traditional techniques for adjusting bearing height include hydraulic height-adjusting bearings and mechanical shim-mounted height-adjusting bearings. Hydraulic height-adjusting bearings integrate hydraulic jacks inside the bearing. While this method allows for active height adjustment, the hydraulic system is susceptible to aging seals, oil leaks, and pressure loss, making it difficult to meet the decades-long service life requirements of bridge bearings. Furthermore, it requires expensive hydraulic pump stations, resulting in extremely high maintenance costs. Mechanical shim-mounted height-adjusting bearings require first using large external jacks to lift the entire bridge, creating space, and then manually inserting steel shims of varying thicknesses. This method is a "passive height adjustment," carrying significant construction risks (prone to instability during the lifting process), and the adjustment accuracy is limited by the shim thickness (typically 5mm or 10mm), making sub-millimeter-level fine adjustments impossible and failing to meet the stringent track smoothness requirements of projects like high-speed railways. Summary of the Invention

[0004] This invention provides a self-wedge type precision height adjustment bridge bearing, which can achieve high-precision bridge height fine adjustment and has a stable self-locking effect.

[0005] This invention provides a self-wedge type precision height-adjustable bridge bearing, including a transmission mechanism and a lifting mechanism; the lifting mechanism includes a bidirectional spiral screw, a first wedge-shaped slider, a second wedge-shaped slider, and a lifting block; the first and second wedge-shaped sliders are arranged in a mirror image and respectively engage with the two sections of the bidirectional spiral screw's threads; the bottom of the lifting block is adapted to and slidably engaged with the top surfaces of the first and second wedge-shaped sliders; the transmission mechanism drives the bidirectional spiral screw to rotate.

[0006] In this invention, a bidirectional spiral screw rotates around an axis. The first and second wedge-shaped sliders on the screw move closer to or further apart, causing the lifting blocks above them to rise or fall. This, in turn, raises or lowers the bridge and its superstructure, achieving the height adjustment effect of the bridge supports. The overall structure is simple and the operation is reliable.

[0007] As a preferred embodiment of the above solution, the lifting mechanism further includes a base, the base having a frame body with an internal cavity structure, the top of the frame body having a through hole for the lifting block to pass through; the first wedge slider and the second wedge slider are located inside the frame body and slide in cooperation with the bottom surface of the frame body; one end of the bidirectional spiral screw passes through the frame body and is located inside the frame body, and the other end is located outside the frame body.

[0008] The base serves as a support component for the wedge-shaped slider and the upper structure, and the frame structure design ensures the stability of the overall structure.

[0009] As a preferred embodiment of the above scheme, the top surfaces of the first wedge slider and the second wedge slider form a V-shaped or inverted V-shaped structure.

[0010] The lifting block includes, from bottom to top, a lifting plate, a connecting column, and a support plate. The bottom of the lifting plate is a V-shaped surface adapted to the V-shaped structure. The top of the lifting plate is fixedly connected to the support plate through the connecting column.

[0011] The V-shaped structure and V-shaped surface ensure that the lifting block always maintains surface contact with the two wedge-shaped sliders during the lifting process, effectively dispersing stress, suppressing lateral displacement, and significantly improving the stability and reliability of the height adjustment process.

[0012] As a preferred embodiment of the above solution, it further includes a mounting base, which includes a housing and a cover; the transmission mechanism includes a drive shaft, a driven shaft, a drive gear, and a driven gear; two sets of bearing assemblies are fixed to the mating surfaces of the housing and the cover after they are fastened together; the drive shaft and the driven shaft are rotatably engaged with the mounting base through corresponding bearing assemblies; the drive gear and the driven gear mesh and are fixed to the drive shaft and the driven shaft, respectively.

[0013] In this invention, the active gear drives the driven gear, which can smoothly convert the input high-speed, low-torque power into the output low-speed, high-torque power. The unique helical tooth meshing method of the gear realizes the simultaneous contact of multiple teeth and the progressive load transmission, which significantly improves the stability and quietness of the transmission mechanism and the lifting mechanism, and improves the load-bearing capacity and service life of the gear.

[0014] As a preferred embodiment of the above solution, one end of the bidirectional spiral screw located on the outside of the base frame is fixedly connected to one end of the driven shaft.

[0015] As a preferred embodiment of the above solution, a pressure sensor is installed inside the housing, and a displacement sensor is installed between the first wedge slider and the second wedge slider.

[0016] This invention achieves real-time monitoring and remote data transmission of bridge settlement and bridge bearing status through the collaborative work of a high-precision air pressure sensor, displacement sensor, microprocessor, and wireless communication module. When bridge settlement occurs, it can quickly respond and locate abnormal situations, significantly improving the safety and efficiency of bridge operation and maintenance.

[0017] As a preferred embodiment of the above scheme, the two sections of the bidirectional spiral screw have different spiral threads, with the left half being a left-hand thread section and the right half being a right-hand thread section.

[0018] The first wedge slider tends to move to the left on the bidirectional spiral screw, but is constrained by the left-hand trapezoidal thread section of the bidirectional spiral screw and cannot move laterally; the second wedge slider tends to move to the right under load, but is constrained by the right-hand trapezoidal thread section and cannot move laterally, thus ensuring that the first and second wedge sliders maintain high stability and structural reliability under long-term load.

[0019] As a preferred embodiment of the above scheme, the first wedge slider and the second wedge slider are provided with multiple through threaded holes at the ends away from the slope surface, and multiple bidirectional spiral screws are threadedly engaged with the multiple through threaded holes on the first wedge slider and the second wedge slider.

[0020] As a preferred embodiment of the above scheme, it further includes an active bevel gear shaft, wherein multiple bevel gear assemblies are spaced apart on the active bevel gear shaft; one end of each of the multiple bidirectional spiral screws extends and is fixed with a bevel gear; the bevel gear assemblies on the active bevel gear shaft respectively mesh with the bevel gears at one end of the multiple bidirectional spiral screws.

[0021] Multiple bidirectional spiral screws rotate synchronously and in the same direction, making the movement of the two wedge-shaped sliders smoother. The horizontal force acting on the wedge-shaped sliders is distributed among the multiple bidirectional spiral screws, reducing the load on a single screw and significantly improving the mechanism's load-bearing stability and lifespan. This enhances the stability of the wedge-shaped sliders during movement and effectively suppresses skewing and jamming caused by uneven force on a single screw, significantly improving the smoothness and positioning accuracy of the bridge's lifting process. Simultaneously, the synchronous transmission of multiple bidirectional spiral screws also improves transmission efficiency.

[0022] The advantages of this invention are:

[0023] 1. The self-wedge type precision height adjustment bridge support in this invention achieves bridge height adjustment by a single person through the linkage of the transmission mechanism and the lifting mechanism. It is simple to operate, has high adjustment accuracy, and can achieve sub-millimeter level precision adjustment.

[0024] 2. In this invention, when the huge vertical load of the bridge and its superstructure is applied to the first and second wedge sliders through the lifting block, they are constrained by the left-hand trapezoidal thread section and the right-hand trapezoidal thread section of the bidirectional spiral screw and cannot move laterally, i.e. the thread is self-locking, thereby ensuring that the first and second wedge sliders maintain high stability and structural reliability under long-term load.

[0025] 3. In this invention, the bearing force on the inclined surfaces of the first and second wedge sliders will generate two forces of opposite direction and equal magnitude on the bidirectional spiral screw. The two opposing horizontal forces form a self-balancing system inside the screw, effectively offsetting the axial component force. This force will not be transmitted to the bearings at both ends of the screw or the side wall of the base box, reducing the redundancy requirements on the shell strength and improving the reliability and durability of the device.

[0026] 4. In this invention, the active gear drives the driven gear, which can smoothly convert the input high-speed, low-torque power into the output low-speed, high-torque power. The unique helical tooth meshing method of the helical gear realizes the simultaneous contact of multiple teeth and the progressive load transmission, which significantly improves the stability and quietness of the transmission mechanism and the lifting mechanism, and improves the load-bearing capacity and service life of the gear.

[0027] 5. This invention achieves real-time monitoring and remote data transmission of bridge settlement and bridge bearing status through the collaborative work of high-precision air pressure sensors, displacement sensors, microprocessors, and wireless communication modules. It can respond quickly when bridge settlement occurs, significantly improving the safety and efficiency of bridge operation and maintenance.

[0028] 6. In this invention, the active bevel gear drives multiple bidirectional spiral screws to rotate synchronously through gear meshing, which together drive the first and second wedge sliders to move and the lifting block to rise and fall. This makes the movement of the two wedge sliders smoother, and the horizontal component force acting on the wedge sliders is distributed by multiple bidirectional spiral screws, reducing the load pressure on a single screw. This significantly improves the load-bearing stability and lifespan of the mechanism, enhances the stability of the wedge sliders during movement, and effectively suppresses the skew and jamming caused by uneven force on a single screw. It also significantly improves the stability and positioning accuracy of bridge structure height adjustment.

[0029] 7. In this invention, the gear ratio between the driving gear and the driven gear allows for precise control of the number of rotations of the bidirectional spiral screw. Furthermore, due to the large gear ratio, only a small torque is needed to overcome the enormous weight of the bridge, making operation easier. The bidirectional spiral screw drives the relative movement of the first and second wedge-shaped sliders, converting the rotational motion of the screw into the linear motion of the wedge-shaped sliders. Adjusting the thread pitch of the bidirectional spiral screw further improves the accuracy of the linear motion of the wedge-shaped sliders. The V-shaped surface formed by the first and second wedge-shaped sliders slides in conjunction with the inverted V-shaped surface at the bottom of the lifting block, converting the horizontal displacement of the two wedge-shaped sliders into the vertical displacement of the lifting block. This effectively enables ultra-high precision height adjustment of the bridge and its superstructure. Attached Figure Description

[0030] Figure 1 These are cross-sectional schematic diagrams of the lifting mechanisms in Embodiments 1 to 3 of the present invention; Figure 2 These are schematic diagrams of the bridge bearings in Embodiments 1 to 3 of the present invention. Figure 3 This is a schematic diagram of the lifting block in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the transmission mechanism in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the structure of the multi-bidirectional spiral lead screw drive in Embodiment 3 of the present invention. Figure 1 ; Figure 6 This is a schematic diagram of the structure of the multi-bidirectional spiral lead screw drive in Embodiment 3 of the present invention. Figure 2 ; In the diagram: 1-Lifting mechanism; 11-Base; 12-Bidirectional spiral screw; 13-First wedge slider; 14-Second wedge slider; 15-Lifting block; 151-Lifting plate; 152-Connecting column; 153-Support plate; 2-Box; 3-Box cover; 4-Transmission mechanism; 41-Drive shaft; 42-Driven shaft; 43-Driven gear; 44-Driven gear; 5-Annular locking mechanism; 6-Driven bevel gear shaft; 7-Bridge; 8-Pier. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1 This embodiment discloses a self-wedge type precision height-adjustable bridge bearing. Figure 2 , Figure 4 As shown, it includes a lifting mechanism 1, a mounting base, and a transmission mechanism 4. The lifting mechanism 1 includes a base 11, a bidirectional spiral lead screw 12, a first wedge slider 13, a second wedge slider 14, and a lifting block 15; the mounting base includes a housing 2 and a housing cover 3; the transmission mechanism 4 includes a drive shaft 41, a driven shaft 42, a drive gear 43, and a driven gear 44.

[0033] like Figure 1 As shown, the lifting mechanism 1 is installed between the pier 8 and the bridge 7, and is used to fine-tune the height of the bridge 7 and its superstructure.

[0034] like Figure 1 , Figure 2 As shown, the main body of the base 11 in the lifting mechanism 1 is a rectangular block. A square frame with a hollow internal structure is set in the middle of the top surface of the rectangular block. The left and right sides of the square frame are closed surfaces, which are used to stabilize the entire square frame and the internal devices. The front and rear sides of the square frame are open structures, which facilitates the installation, disassembly and maintenance of the internal devices. The top of the square frame has a through hole for the vertical movement of the lifting block 15.

[0035] like Figure 1 As shown, a first wedge slider 13 and a second wedge slider 14 are placed mirror-symmetrically on the bottom surface of the square frame of the base 11. The first wedge slider 13 and the second wedge slider 14 are right-angled trapezoidal prisms, and the bottom surfaces of the two wedge sliders slide in contact with the bottom surface of the square frame of the base 11. The top surfaces of the first wedge slider 13 and the second wedge slider 14 are sloping surfaces, and the sloping surfaces of the first wedge slider 13 and the second wedge slider 14 form a V-shaped structure, and a through threaded hole is provided at the end away from the sloping surface.

[0036] like Figure 1 As shown, the bidirectional spiral screw 12 is provided with a threaded section. The left half of the threaded section is machined with a left-hand trapezoidal thread, and the right half is machined with a right-hand trapezoidal thread. The threaded section of the bidirectional spiral screw 12 passes horizontally into the left or right closed surface of the square frame and enters the cavity. The left-hand trapezoidal thread and the right-hand trapezoidal thread are threaded into the threaded holes of the first wedge slider 13 and the second wedge slider 14, respectively. The lengths of the left-hand trapezoidal thread and the right-hand trapezoidal thread are sufficient to satisfy the movement stroke of the first wedge slider 13 and the second wedge slider 14 within the square frame of the base 11.

[0037] In this embodiment, under the action of the two opposing threads of the bidirectional spiral screw 12, when the bidirectional spiral screw 12 rotates clockwise, the first wedge slider 13 and the second wedge slider 14 move closer to each other; when the bidirectional spiral screw 12 rotates counterclockwise, the first wedge slider 13 and the second wedge slider 14 move further apart. The symmetrical design of the double spiral threads ensures that the sliders on both sides are subjected to balanced forces and have synchronized displacements, eliminating micro-movement deviations caused by assembly errors and significantly improving the accuracy and stability of the bridge bearing during the height adjustment process.

[0038] like Figure 3 As shown, the lifting block 15 includes, from bottom to top, a lifting plate 151, a connecting column 152, and a support plate 153. The lifting plate 151 is a symmetrical pentagonal prism with a cross-section that is a combination of a rectangle on top and a V-shape on the bottom. Its top surface is a square face, which is the same size as or slightly smaller than the opening of the square frame of the base 11, ensuring that the lifting plate 151 can move up and down within the cavity of the square frame. The bottom end of the lifting plate 151 is lower in the middle and higher on both sides, forming two symmetrical inclined surfaces. The two inclined surfaces combine to form a V-shaped surface. The V-shaped surface at the bottom end of the lifting plate 151 is adapted to the V-shaped structure formed by the top surfaces of the first wedge slider 13 and the second wedge slider 14, so that the V-shaped surface at the bottom end of the lifting plate 151 slides into the V-shaped structure formed by the top surfaces of the first wedge slider 13 and the second wedge slider 14. A connecting column 152 is provided at the center of the top surface of the lifting plate 151. The connecting column 152 is a circular column used to connect the lifting plate 151 and the support plate 153. The support plate 153 is provided at the top of the connecting column 152. The support plate 153 is a large rectangular block that makes large-area contact with the bridge structure, thereby improving the stability of the bridge structure when it is supported.

[0039] In this embodiment, when the massive vertical load of the bridge 7 and its superstructure is applied to the first wedge-shaped slider 13 and the second wedge-shaped slider 14 via the lifting block 15, the first wedge-shaped slider 13 tends to move to the left on the bidirectional spiral screw 12. Constrained by the left-handed trapezoidal thread segment of the bidirectional spiral screw 12 (i.e., thread self-locking), the first wedge-shaped slider 13 cannot produce lateral displacement. At this time, the first wedge-shaped slider 13 exerts a horizontal force to the left on the bidirectional spiral screw 12. Similarly, the second wedge-shaped slider 14 tends to move to the right under the load, but is constrained by the right-handed trapezoidal thread segment and cannot move laterally (i.e., thread self-locking). At this time, the second wedge-shaped slider 14 applies a horizontal force to the right on the bidirectional spiral screw 12. These two axial forces, which are opposite in direction and equal in magnitude, act simultaneously on the same bidirectional spiral lead screw 12. The two opposing horizontal forces form a self-balancing system inside the lead screw, effectively offsetting the axial component force. This prevents the force from being transmitted to the bearings at both ends of the lead screw or the side wall of the base housing, ensuring that the transmission structure remains axially stable when subjected to vertical heavy loads. This greatly simplifies the end fixing structure of the support, reduces the redundancy requirements for the strength of the housing, and improves the reliability and durability of the device.

[0040] In this embodiment, the lifting mechanism 1 is placed on the bridge pier 8, and the base 11 is fixed to the bridge pier 8 with bolts. By rotating the bidirectional spiral screw 12, the first wedge slider 13 and the second wedge slider 14 are driven to move closer to each other, thereby raising the lifting block 15 until the support plate 153 of the lifting block 15 is in complete contact with the bridge 7, thus effectively supporting the bridge 7. When adjusting the height of the bridge 7 and the superstructure, the bidirectional spiral screw 12 rotates around an axis, driving the first wedge slider 13 and the second wedge slider 14 on the bidirectional spiral screw 12 to move closer to each other or further away, adjusting the height of the lifting block 15 above the two wedge sliders, thereby raising or lowering the bridge 7 and the superstructure, achieving the height adjustment effect of the bridge support.

[0041] like Figure 2 , Figure 4 As shown, the mounting base includes a housing 2 and a cover 3. The housing 2 is a hollow, high-strength cast steel component, which serves to support the cover 3 and the transmission mechanism 4. Two sets of semi-circular bearing mounting holes are symmetrically arranged along the long side of the top of the housing 2, and bearing assemblies for the drive shaft 41 and the driven shaft 42 are fixedly mounted thereon.

[0042] The cover 3 is a hollow ordinary cast steel part. Two sets of symmetrical semi-circular bearing mounting holes are provided along the long side of the bottom of the cover 3, corresponding to the housing 2, to provide space for the bearing assembly to rotate. The bottom of the cover 3 is fixedly connected to the top of the housing 2 with bolts, forming a closed box-shaped structure.

[0043] like Figure 4 As shown, the transmission mechanism 4 includes a drive shaft 41, a driven shaft 42, a drive gear 43, and a driven gear 44. On the top of the housing 2, near the drive shaft 41, two sets of bearing assemblies matching the drive shaft 41 are fixedly installed in two symmetrically arranged semi-circular bearing mounting holes. The drive shaft 41 passes through these two sets of bearing assemblies, allowing it to be rotatably connected to the housing 2. A drive gear 43 is mounted on the drive shaft 41 and is fixedly connected to it by a key. On the top of the housing 2, near the driven shaft 42, two sets of bearing assemblies matching the driven shaft 42 are fixedly installed in two symmetrically arranged semi-circular bearing mounting holes. The driven shaft 42 passes through these two sets of bearing assemblies, allowing it to be rotatably connected to the housing 2. A driven gear 44 is mounted on the driven shaft 42 and is fixedly connected to it by a key.

[0044] In this embodiment, both the driving gear 43 and the driven gear 44 are helical gears, and they mesh with each other. When the driving shaft 41 is driven to rotate manually or by a motor, the driving shaft 41 drives the driving gear 43 to rotate, and the driving gear 43 drives the driven gear 44 to rotate through gear meshing. The driven gear 44 then drives the driven shaft 42 to rotate. The driving gear 43 driving the driven gear 44 can smoothly convert the input high-speed, low-torque power into the output low-speed, high-torque power. The unique helical tooth meshing of the helical gears enables multiple teeth to contact simultaneously and progressively transmit loads, significantly improving the smoothness and quietness of the transmission mechanism 4, and increasing the load-bearing capacity and service life of the gears. In addition, by setting the tooth ratio between the driving gear 43 and the driven gear 44, precise transmission ratio adjustment can be achieved, and the number of rotations and rotation angle of the driven gear 44 can be precisely controlled.

[0045] like Figure 2 As shown, the bearing semi-circular mounting holes at the top of the housing 2 and the bottom of the cover 3 are connected by a hollow flange. The flange is fastened to the housing 2 and the cover 3 with bolts to form a stable and sealed connection structure. An oil-resistant rubber sealing ring is embedded in the flange to prevent dust and moisture intrusion.

[0046] like Figure 2 As shown, one end of the driven shaft 42 is fixed to one end of the bidirectional spiral screw 12. The fixing can be done by welding or by bolt connection to ensure a stable and reliable connection.

[0047] In this embodiment, the movement process of the device is as follows: when the drive shaft 41 is rotated manually or by motor, the drive shaft 41 drives the drive gear 43 to rotate, the drive gear 43 drives the driven gear 44 to rotate through gear meshing, the driven gear 44 drives the driven shaft 42 to rotate, the driven shaft 42 drives the bidirectional spiral screw 12 to rotate synchronously, and the bidirectional spiral screw 12 drives the first wedge slider 13 and the second wedge slider 14 to move closer to each other or further away from each other through threaded engagement, so that the lifting block 15 rises or falls, thereby causing the height of the bridge 7 and the superstructure to change.

[0048] like Figure 2 As shown, the annular engagement locking mechanism 5 is a device for mechanically clamping the driven shaft 42. The annular engagement locking mechanism 5 is fixed on the mounting base. By clamping the outer circumferential surface of the driven shaft 42, the stability of locking during the lifting process can be further improved. The annular engagement locking mechanism 5 is a common mechanical locking structure in the art.

[0049] This embodiment provides a process for precisely adjusting the height of the height-adjusting support, as detailed below: When the support needs to be raised, the operator connects the drive shaft 41 and the drive gear 43 with a key. Rotating the drive shaft 41 drives the drive gear 43 to rotate synchronously, and the drive gear 43 drives the driven gear 44 fixed to the end of the lead screw to rotate through gear meshing.

[0050] Driven gear 44 drives driven shaft 42 to rotate, and driven shaft drives bidirectional spiral screw 12 fixedly connected to it to rotate.

[0051] When the bidirectional spiral screw 12 rotates, the first wedge slider 13 and the second wedge slider 14 will move towards the center or separate outwards at the same time because the left and right sections of the screw have opposite spiral directions.

[0052] When the first wedge slider 13 and the second wedge slider 14 move toward the center, the lifting block 15 is lifted up, thereby causing the bridge 7 above the lifting block 15 to rise.

[0053] Based on the geometric relationship of the wedge-shaped slider, we can obtain: .

[0054] in: This refers to the vertical lifting amount of lifting block 15; This represents the horizontal movement of the wedge-shaped slider; The angle of inclination of the wedge-shaped slider.

[0055] Assuming the reduction ratio is 12-pitch bidirectional spiral screw wedge block slider tilt angle .

[0056] When the drive shaft 41 rotates one revolution, the bidirectional spiral screw 12 rotates 0.1 revolutions through gear meshing, and the slider moves horizontally by 0.4 mm.

[0057] The final vertical lifting amount of lifting block 15 is: .

[0058] Therefore, the bridge bearing of the present invention can achieve extremely precise micron-level height adjustment.

[0059] In this embodiment, the gear ratio between the driving gear 43 and the driven gear 44 allows for precise control of the number of rotations of the bidirectional spiral screw 12. Furthermore, due to the large gear ratio, only a small torque is needed to overcome the enormous weight of the beam, making operation easier. The bidirectional spiral screw 12 drives the relative movement of the first wedge-shaped slider 13 and the second wedge-shaped slider 14, converting the rotational motion of the bidirectional spiral screw 12 into the linear motion of the wedge-shaped sliders. By adjusting the thread pitch of the bidirectional spiral screw 12, the accuracy of the linear motion of the wedge-shaped sliders can be further improved. The V-shaped surface formed by the first wedge-shaped slider 13 and the second wedge-shaped slider 14 slides into the V-shaped surface at the bottom of the lifting block 15, converting the horizontal displacement of the two wedge-shaped sliders into the vertical displacement of the lifting block 15. This ultimately achieves a high-precision vertical adjustment function, enabling effective ultra-high-precision height adjustment of the bridge 7 and its superstructure.

[0060] Example 2 Based on Example 1, this embodiment adds an intelligent monitoring function, which can achieve the technical effects of monitoring bridge settlement and bridge bearing status.

[0061] A high-precision barometric pressure sensor (not shown in the figure) is installed inside the housing 2. It can be a digital barometric pressure sensor or a ready-made barometric altimeter to measure the absolute altitude of the bridge.

[0062] A displacement sensor (not shown in the figure) is provided between the first wedge slider 13 and the second wedge slider 14. It can be a wire encoder or a magnetostrictive displacement sensor, used to measure the horizontal distance between the first wedge slider 13 and the second wedge slider 14 in real time, and the built-in microprocessor automatically calculates the current change in support height using a formula.

[0063] When a high-precision barometric pressure sensor detects a change in the bridge's absolute elevation, it determines that the bridge has settled and transmits the information to the host computer at the bridge maintenance center via a LoRa or NB-IoT wireless module. The host computer then issues an alarm signal. Technicians first use displacement sensors installed on the first wedge-shaped slider 13 and the second wedge-shaped slider 14 to determine if there are any abnormalities in the bridge supports. If there are no abnormalities, the height of the bridge supports is increased to compensate for the settlement of the bridge structure. If there are abnormalities in the supports, personnel are immediately dispatched to cordon off the site and carry out emergency repairs to avoid structural safety hazards caused by support failure.

[0064] This embodiment achieves real-time monitoring and remote data transmission of bridge settlement and bridge bearing status through the collaborative work of high-precision air pressure sensors, displacement sensors, microprocessors, and wireless communication modules. When bridge settlement occurs, it can quickly respond and locate abnormal situations, significantly improving the safety and efficiency of bridge operation and maintenance.

[0065] Example 3 Based on Example 1, this embodiment proposes a bridge support scheme in which multiple bidirectional spiral screws rotate synchronously to drive the movement of a wedge-shaped slider, thereby precisely adjusting the height of bridge 7.

[0066] like Figure 5 As shown, the first wedge slider 13 and the second wedge slider 14 are provided with multiple through threaded holes (only 3 are shown in the figure) at the ends away from the slope. Multiple bidirectional spiral screws 12 are threadedly engaged with the multiple through threaded holes on the first wedge slider 13 and the second wedge slider 14 respectively. The left-hand trapezoidal thread section of the bidirectional spiral screw 12 is threadedly engaged with the first wedge slider 13, and the right-hand trapezoidal thread section of the bidirectional spiral screw 12 is threadedly engaged with the second wedge slider 14.

[0067] Multiple bidirectional spiral screws 12 rotate synchronously and in the same direction, causing the first wedge slider 13 and the second wedge slider 14 to move closer to or further away from each other.

[0068] like Figure 6 As shown, multiple bidirectional spiral screws 12 extend from one end of the square frame of the base 11 and are fixed with bevel gears. The rotation axis of the bevel gears is consistent with the axis of the bidirectional spiral screws 12.

[0069] like Figure 6 As shown, on the side of the base 11 near the bevel gears of the multiple bidirectional spiral screws 12, two bearing mounting seats are symmetrically arranged on the long side of the base 11. Bearing assemblies are fixed inside each of the two bearing mounting seats. The drive bevel gear shaft 6 passes through the two sets of bearing assemblies and is rotatably engaged with each bearing mounting seat. Multiple bevel gear assemblies are spaced apart on the drive bevel gear shaft 6. The axes of these multiple bevel gear assemblies are aligned with the axis of the drive bevel gear shaft 6 and rotate synchronously with it. The multiple bevel gear assemblies on the drive bevel gear shaft 6 mesh with the bevel gears at the ends of the multiple bidirectional spiral screws 12. When the drive bevel gear shaft 6 rotates, it drives the multiple bidirectional spiral screws 12 to rotate synchronously, causing the first wedge slider 13 and the second wedge slider 14 to move closer to or further away from each other, thereby causing the lifting block 15 to rise or fall, ultimately achieving the function of fine-tuning the height of the bridge 7.

[0070] In this embodiment, the active bevel gear shaft 6 is engaged with multiple bidirectional spiral screws 12 with bevel gears. When the active bevel gear shaft 6 rotates, it drives the multiple bidirectional spiral screws 12 to rotate, thereby realizing the horizontal movement of the first wedge slider 13 and the second wedge slider 14 and the vertical lifting of the lifting block 15. In this embodiment, the multiple bidirectional spiral screws 12 rotate synchronously and in the same direction, making the movement of the two wedge sliders smoother. The horizontal component force acting on the wedge slider is distributed by the multiple bidirectional spiral screws 12, reducing the load pressure on a single screw, significantly improving the load-bearing stability and lifespan of the mechanism, improving the stability of the wedge slider movement and effectively suppressing the skew and jamming caused by uneven force on a single screw, and significantly improving the stability and positioning accuracy of the bridge 7 lifting process.

[0071] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-wedge type precision height-adjustable bridge bearing, characterized in that, It includes a transmission mechanism (4) and a lifting mechanism (1); the lifting mechanism (1) includes a bidirectional spiral screw (12), a first wedge slider (13), a second wedge slider (14) and a lifting block (15); The first wedge slider (13) and the second wedge slider (14) are arranged in a mirror image and respectively engage with the two sections of the bidirectional spiral screw (12) with different spiral threads; the bottom of the lifting block (15) is adapted to and slides with the top surface of the first wedge slider (13) and the second wedge slider (14); the transmission mechanism (4) drives the bidirectional spiral screw (12) to rotate.

2. The bridge bearing with self-wedge-type precise height adjustment according to claim 1, characterized in that, The lifting mechanism (1) also includes a base (11), which has a frame body with an internal cavity structure. The top of the frame body has a through hole for the lifting block (15) to pass through. The first wedge slider (13) and the second wedge slider (14) are located inside the frame body and slide in cooperation with the bottom surface of the frame body. One end of the bidirectional spiral screw (12) passes through the frame body and is located inside the frame body, while the other end is located outside the frame body.

3. A self-wedge type precision height-adjustable bridge bearing according to claim 1 or 2, characterized in that, The top surfaces of the first wedge slider (13) and the second wedge slider (14) form a V-shaped structure.

4. A self-wedge type precision height-adjustable bridge bearing according to claim 3, characterized in that, The lifting block (15) includes, from bottom to top, a lifting plate (151), a connecting column (152), and a support plate (153). The bottom of the lifting plate (151) is a V-shaped surface adapted to the V-shaped structure. The top of the lifting plate (151) is fixedly connected to the support plate (153) through the connecting column (152).

5. A self-wedge type precision height-adjustable bridge bearing according to claim 2, characterized in that: It also includes a mounting base, which includes a housing (2) and a cover (3); the transmission mechanism (4) includes a drive shaft (41), a driven shaft (42), a drive gear (43), and a driven gear (44); the housing (2) and the cover (3) are fastened together and fixed with two sets of bearing assemblies, and the drive shaft (41) and the driven shaft (42) are respectively rotated and engaged with the mounting base through the corresponding bearing assemblies; the drive gear (43) and the driven gear (44) mesh and are respectively fixed with the drive shaft (41) and the driven shaft (42).

6. A self-wedge type precision height-adjustable bridge bearing according to claim 5, characterized in that: The bidirectional spiral screw (12) is fixedly connected at one end of the outer side of the base (11) frame to one end of the driven shaft (42).

7. A self-wedge type precision height-adjustable bridge bearing according to claim 5, characterized in that: A pressure sensor is installed inside the housing (2), and a displacement sensor is installed between the first wedge slider (13) and the second wedge slider (14).

8. A self-wedge type precision height-adjustable bridge bearing according to claim 1, characterized in that: The two sections of the bidirectional spiral screw (12) have different spiral threads, with the left half being a left-hand thread section and the right half being a right-hand thread section.

9. A self-wedge type precision height-adjustable bridge bearing according to claim 1, characterized in that: The first wedge slider (13) and the second wedge slider (14) are evenly provided with multiple through threaded holes, and multiple bidirectional spiral screws (12) are threadedly engaged with the multiple through threaded holes on the first wedge slider (13) and the second wedge slider (14).

10. A self-wedge type precision height-adjustable bridge bearing according to claim 9, characterized in that: It also includes an active bevel gear shaft (6), on which multiple bevel gear assemblies are spaced apart; one end of each of the multiple bidirectional spiral screws (12) is extended and fixed with a bevel gear; the multiple bevel gear assemblies on the active bevel gear shaft (6) respectively mesh with the bevel gears at one end of the multiple bidirectional spiral screws (12).

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