Bridge rotation weighing device

Abstract

The invention relates to the technical field of bridge construction, in particular to a bridge swivel weighing device, which comprises a fixed frame, a mounting plate, a bridge pier, a rotating assembly, a cantilever and a weight bearing block, and is characterized in that the fixed frame adopts the combination of a bottom frame and a rotatably arranged support frame, and the top of the support frame is provided with a sliding groove matched with a sliding rod and a limiting sleeve; compared with a traditional device depending on an annular guide rail, the device gets rid of dependence on a specific horizontal annular rail, large-scale site leveling and infrastructure construction for installing the annular guide rail do not need to be carried out in a complex terrain area, for example, in a mountainous area, even if the ground is bumpy, the chassis can be placed at a relatively stable position through simple leveling treatment, and the construction efficiency is improved. The supporting frame can flexibly rotate on the bottom frame according to the terrain, the sliding rod slides in the sliding groove, the limiting sleeve limits the rotating range of the supporting frame, the whole device can adapt to the terrains with different angles and gradients, and the application scene is greatly expanded.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and particularly to a bridge rotation weighing device. Background Art

[0002] As is well known, the bridge rotation construction method can better overcome the construction difficulties of deep-water foundations in high mountains and valleys, deep rivers with rapid water flow, or overcome the difficulties of erecting large-span structures across frequently navigable rivers. Especially for the construction of urban overpasses and railway overpass bridges in busy transportation areas, its advantages are more obvious. The rotation technology divides the whole span of the part of the bridge spanning rivers, highways, or railways into two parts, and constructs them on both banks or on both sides of the road respectively. After the superstructure of the bridge is basically completed, the two parts are closed into an integral bridge through the rotation of the beam body on the main piers on both banks. The key technologies of the rotation construction method are the rotation equipment and rotation capacity, the structural stability and strength guarantee during the construction process, the closure of the structure, and the conversion of the system.

[0003] After retrieval, the invention patent with the authorized publication number of CN220729541U discloses a bridge rotation weighing device, which includes a long cantilever and a short cantilever. Support columns are arranged on both the long cantilever and the short cantilever of the bridge, and a number of pressure sensors for measuring the supporting force are arranged between the support columns and the long cantilever, and between the support columns and the short cantilever. Guide rollers are arranged at the bottoms of the two support columns, and the guide rollers are movably arranged on a horizontal circular guide rail. A fixed counterweight block and a movable counterweight mechanism are arranged on the short cantilever. A number of pressure sensors and the movable counterweight mechanism are electrically connected to a controller. This solution can offset the unbalanced moment before rotation through the fixed counterweight block, and adjust the counterweight on the short cantilever through the movable counterweight mechanism to offset the unbalanced moment during rotation, so that the bridge has strong stability and reliability during the rotation process and is not easily vertically displaced due to the unbalanced moment.

[0004] Although the above technical solution solves the problem of ensuring the stability of the bridge during rotation, in the above technical solution, the guide rollers at the bottoms of the two support columns rely on the horizontal circular guide rail for movement, which becomes an obstacle in complex terrain areas. In high mountain and valley areas, the terrain has large undulations and steep slopes, and it is difficult to find a flat site with sufficient area to install the circular guide rail. Due to the limited installation of the circular guide rail, the device is difficult to play its due function in these complex terrain areas, resulting in restrictions on its promotion in different bridge projects. This not only limits the application of the bridge rotation construction technology in a wider area, but also increases the cost and difficulty of bridge construction in complex terrain. Summary of the Invention

[0005] Technical Problems to be Solved

[0006] In order to overcome the problem that the existing bridge rotation weighing device has poor adaptability to complex terrains, the present invention provides a bridge rotation weighing device with the effect of adapting to complex terrains.

[0007] Technical solution

[0008] To achieve the above object, the present invention provides the following technical solution: A bridge rotation weighing device, comprising:

[0009] A fixing frame, the fixing frame is composed of a bottom frame, the bottom frame is horizontally placed on the base surface, a support frame is rotatably arranged above the bottom frame through a bearing, so that the support frame can rotate horizontally around the rotating shaft of the bottom frame, the top of the support frame is above the bottom frame, a chute with a rectangular cross-section is opened at the top of the support frame, the chute extends along the transverse direction of the support frame, one end of the sliding rod is located in the chute and can slide along the length direction of the chute, the other end of the sliding rod extends downward to the side of the bottom frame, a limiting sleeve is rotatably arranged on the sliding rod, and the limiting sleeve is sleeved on the outer side wall of the bottom frame and is located at a position close to the connecting end of the sliding rod;

[0010] A mounting plate, the mounting plate is above the top of the support frame and is fixedly connected to the top of the support frame through high-strength bolts, and the two are in contact with each other;

[0011] A bridge pier, the bridge pier is vertically erected at the central position of the top of the mounting plate and is perpendicularly connected to the top of the mounting plate;

[0012] A rotating assembly, the rotating assembly is above the top of the bridge pier, and its bottom is fixedly connected to the center of the top of the bridge pier;

[0013] A cantilever, the cantilever is above the top of the rotating assembly, one end of it is perpendicularly welded to the top of the rotating assembly, and the cantilever extends horizontally;

[0014] A weight block, the weight block is located at the end of the short end of the cantilever and is fixedly connected to the top of the short end of the cantilever.

[0015] Preferably, the mounting plate includes a bottom plate, the bottom plate is horizontally placed above the top of the support frame, a long groove is opened along the length direction on the large surface of the bottom plate, a rotating rod is rotatably arranged at the central axis position of the long groove, the bottom of the rotating rod passes through the long groove downward and is connected to a counterweight ball, and the top of the rotating rod extends upward out of the long groove and is welded to the center of the bottom of the bridge pier.

[0016] Furthermore, the rotating assembly includes a driving shaft, the driving shaft is vertically fixed at the central position of the top of the bridge pier and is connected to the top of the bridge pier through a key, the top of the driving shaft extends upward and is fixedly connected to the center of a horizontally placed square plate, a rotating disc is rotatably arranged above the top of the square plate and at its central position, the rotating disc is connected to the top of the driving shaft through a spline, and the top of the rotating disc is welded to the center of the bottom of one end of the cantilever.

[0017] Furthermore, a scale is engraved on the upper surface of the square plate along the circumferential direction, and a pointer is fixedly arranged near the edge of the upper surface of the rotating disc, and the pointer points to the scale on the square plate.

[0018] In a further embodiment, nuts are threadedly connected at the positions of the openings of the long grooves on both sides of the rotating rod.

[0019] On the basis of the foregoing solution, a slide rail is further included. The slide rail is horizontally fixed at the top of the short end of the cantilever and extends along the length direction of the short end of the cantilever. A weight adjusting block is slidably arranged on the top of the slide rail.

[0020] On the basis of the foregoing solution, a threaded block is further included. The threaded block is fixed at the center position of the bottom of the weight adjusting block and is welded to the weight adjusting block. A screw rod is rotatably arranged on the slide rail and on the center line in its length direction, and the screw rod is threadedly connected to the threaded block.

[0021] Beneficial effects

[0022] For this bridge rotation weighing device, the fixed frame is composed of a bottom frame and a rotatably arranged support frame, and the design of the chute opened at the top of the support frame in cooperation with the sliding rod and the limit sleeve. Compared with the traditional device relying on a circular guide rail, it gets rid of the dependence on a specific horizontal circular track. In areas with complex terrain, there is no need to carry out large-scale site leveling and infrastructure construction for installing the circular guide rail. For example, in mountainous areas, even if the ground is rough and uneven, the bottom frame can be placed in a relatively stable position through simple leveling treatment, and the support frame can rotate flexibly on the bottom frame according to the terrain. The sliding of the sliding rod in the chute and the limitation of the rotation range of the support frame by the limit sleeve enable the whole device to adapt to terrains with different angles and slopes, greatly expanding the applicable scenarios. Description of the drawings

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the fixed frame of the present invention;

[0025] Figure 3 It is a structural schematic diagram of the mounting plate of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the rotating assembly of the present invention;

[0027] Figure 5 It is a structural schematic diagram of the weight adjusting block of the present invention.

[0028] In the figure: 1, fixed frame; 2, chassis; 3, support frame; 4, chute; 5, sliding rod; 6, limit sleeve; 8, mounting plate; 9, bridge pier; 10, rotating assembly; 11, cantilever; 12, load block; 13, bottom plate; 14, long slot; 15, rotating rod; 16, counterweight ball; 17, drive shaft; 18, square plate; 19, rotating disc; 20, pointer; 21, nut; 22, slide rail; 23, weight adjustment block; 24, threaded block; 25, screw rod. Detailed implementation manner

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] Refer to Figures 1 to 5 , a bridge rotation weighing device, including a fixed frame 1, a mounting plate 8, a bridge pier 9, a rotating assembly 10, a cantilever 11 and a load block 12.

[0031] In this embodiment, the fixing frame 1 includes a chassis 2. The chassis 2 is formed by splicing multiple I-beams through a welding process into a frame structure, constituting the basic support part of the fixing frame 1. The chassis 2 is connected to the ground or foundation by embedded bolts, providing a stable installation platform for other components, bearing the weight of the entire device and part of the bridge structure. The support frame 3 is installed on the chassis 2 through tapered roller bearings and can rotate horizontally relative to the chassis 2. A long strip-shaped chute 4 with a rectangular cross-section is opened at the top of the support frame 3. The surface of the chute 4 is machined by grinding to provide precise sliding guidance for the sliding rod 5. One end of the sliding rod 5 is connected to the limit sleeve 6, enabling the sliding rod 5 to rotate relative to the limit sleeve 6. The sliding rod 5 connects the support frame 3 and the limit sleeve 6, and adjusts the position of the limit sleeve 6 through its own sliding and rotation. The inner diameter of the limit sleeve 6 is larger than the outer diameter of the chassis 2, forming an annular gap between them. The limit sleeve 6 is sleeved on the chassis 2 to limit the rotation angle range of the support frame 3 and ensure the working stability of the fixing frame 1. The mounting plate 8 is designed according to the bottom size of the bridge pier 9, made of steel plate, and fixed to the top of the support frame 3 by high-strength bolts or welding process, providing a stable installation foundation for the bridge pier 9. The bridge pier 9 is cast in place with reinforced concrete, with longitudinal and transverse steel bars configured inside to enhance the structural strength. The bridge pier 9 is vertically fixed on the top of the mounting plate 8, serving as an important support structure of the bridge and at the same time providing an installation carrier for the rotating assembly 10 and the cantilever 11. The rotating assembly 10 is installed on the top of the bridge pier 9, and the cantilever 11 is fixed to the top of the upper turntable of the rotating assembly 10 by welding or bolt connection. The cantilever 11 is strip-shaped, with one end longer than the other. The long end simulates the cantilever 11 part of the bridge, and the short end is used to install the load block 12. The load block 12 is made of cast iron or concrete, and different weight specifications are designed according to the needs of simulating different stress conditions. It is fixed to the short end of the cantilever 11 through embedded lifting rings and connecting bolts. By changing the weight of the load block 12 and its installation position on the cantilever 11, the stress state of the cantilever 11 is adjusted to simulate the forces in different conditions of the bridge rotation, providing data support for the bridge rotation weighing. These components cooperate with each other. The fixing frame 1 realizes support and angle adjustment. The mounting plate 8 and the bridge pier 9 bear and connect each component. The rotating assembly 10 completes the simulation of the bridge rotation. The cantilever 11 and the load block 12 simulate different stress conditions, jointly completing the bridge rotation weighing work and providing important data for bridge construction and safety assessment.

[0032] First, refer to Figure 3, in this embodiment, the main part of the mounting plate 8 is the bottom plate 13, which is made of high-quality steel with high toughness and strength. This kind of steel is processed by a special rolling process and has excellent anti-deformation ability, capable of firmly bearing various additional loads during the upper structure and measurement process. A long groove 14 is opened on the bottom plate 13. The long groove 14 is a rectangular through groove that penetrates a certain length of the bottom plate 13. The inner wall of the long groove 14 is processed by fine milling and grinding processes, providing a precise space for the smooth rotation of the rotating rod 15. The rotating rod 15 is installed on the inner wall of the long groove 14 through a high-precision deep groove ball bearing. This kind of bearing has the characteristics of low friction coefficient and high rotation accuracy, ensuring that the rotating rod 15 can rotate 360 degrees without jamming in the long groove 14. A counterweight ball 16 is welded and fixed at the bottom of the rotating rod 15. The counterweight ball 16 is made of lead with extremely high density, and its density is much greater than that of ordinary metals. It can effectively achieve a large weight load with a small volume. When the rotating rod 15 rotates, the counterweight ball 16 moves accordingly. According to the lever principle, the center of gravity distribution of the mounting plate 8 and the bridge pier 9 is adjusted by changing the position of the counterweight ball 16. The top of the rotating rod 15 is fixedly connected to the bottom of the bridge pier 9 by welding or high-strength bolts. The welding uses a special welding process to ensure that the weld strength is equivalent to that of the base material. With the high-precision bolt hole processing, it is ensured that the bridge pier 9 can accurately adjust the angle as the rotating rod 15 rotates to meet different measurement requirements.

[0033] Then, refer to Figure 4 , in this embodiment, the core component of the rotating assembly 10 is the drive shaft 17, which is vertically fixed on the top of the bridge pier 9 and made of high-strength alloy steel. This alloy steel is added with a variety of alloy elements and processed by a special heat treatment process, making it have sufficient strength and stiffness to withstand a large torque without obvious deformation or damage. The drive shaft 17 provides the core of power transmission for the rotating assembly 10 and cooperates with other components through the keyway on the shaft body to transmit power to the upper components. A square plate 18 is welded and fixed at the top of the drive shaft 17. The square plate 18 is a square metal plate made of a metal matching the material of the drive shaft 17. The welding process ensures a firm connection and strong integrity between the two. The rotating disk 19 is installed on the top of the square plate 18 through a high-precision tapered roller bearing. The tapered roller bearing can bear both radial and axial loads and adapt to the complex stress conditions of the rotating disk 19 during operation. The rotating disk 19 is also a metal disk made by forging process and has good internal organizational structure and mechanical properties. The rotating disk 19 is connected to the drive shaft 17 by a flat key. The size and tolerance of the flat key are strictly designed according to the standard to ensure synchronous rotation of the two. The top of the rotating disk 19 is connected to the cantilever 11 by welding or bolts. When welding, a multi-layer and multi-pass welding process is used to ensure the weld quality. For bolt connection, high-strength bolts are selected and paired with lock washers to drive the cantilever 11 to rotate together.

[0034] Secondly, refer to Figure 4In this embodiment, the edge of the square plate 18 is uniformly engraved with a circular scale in degrees. A high-precision laser etching process is used. This process uses a high-energy-density laser beam to act on the surface of the square plate. By accurately controlling various parameters of the laser, it is ensured that the laser beam etches clear and accurate scale lines on the surface of the square plate. In the entire engraving process, the energy and spot position of the laser are monitored in real time with the help of a closed-loop control system, so as to ensure that the error of each scale is strictly controlled within a very small range, thereby ensuring the high precision of the scale. The pointer 20 is fixedly mounted on the rotating disk 19. The selected metal material has the characteristics of light weight and good rigidity. The pointer is firmly fixed on the rotating disk 19 by a precision riveting process, ensuring that the connection strength between the pointer and the rotating disk is extremely high and can stably rotate with the rotating disk 19. When the rotating disk 19 rotates, the pointer 20 will pass over the scale of the square plate 18. The operator only needs to read the scale indicated by the pointer to directly obtain the rotation angle of the rotating disk 19 and the cantilever 11.

[0035] Again, see Figure 3 In this embodiment, threads are processed on both sides of the rotating rod 15, and the nut 21 is connected to the rotating rod 15 by threads. The nut 21 is made of metal that matches the material of the rotating rod 15, and the two have good thread matching performance. When the rotating rod 15 needs to be fixed, the operator tightens the nut 21 with a torque wrench. As the nut 21 is tightened, a sufficiently large friction force will be generated between the nut 21 and the inner wall of the long groove 14. The friction force can effectively fix the position of the rotating rod 15 in the long groove 14 to prevent it from rotating at will, thereby ensuring the stability of the device during the measurement process.

[0036] In addition, see Figure 5 In this embodiment, the slide rail 22 equipped with the device is fixed on the top of the short end of the cantilever 11, and a T-type slide rail is adopted. The T-type slide rail is connected to the cantilever 11 by bolts. The slide rail 22 is made of a material with high hardness and excellent wear resistance. During the manufacturing process, the surface undergoes a special heat treatment process, including quenching and tempering, etc., to improve its performance, and then is ground to ensure that the straightness and surface quality of the slide rail 22 meet high standards. At the same time, high-strength bolts are selected to ensure that the slide rail 22 is firmly and reliably connected to the cantilever 11. The bottom of the weight adjustment block 23 is processed with a slide groove matching the slide rail 22. The weight adjustment block 23 is made of cast iron or other high-density materials, among which cast iron has the significant characteristics of low cost, good casting performance and high density. The weight adjustment block 23 can slide smoothly along the length direction of the cantilever 11 at the top of the slide rail 22. By changing the position of the weight adjustment block 23 on the cantilever 11, the weight distribution of the short end of the cantilever 11 is adjusted according to the lever principle, thereby simulating the stress conditions of the bridge swivel under different working conditions.

[0037] Finally, see Figure 5, in this embodiment, the bottom of the weight adjustment block 23 is fixed with a threaded block 24 through a specific welding process. The welding parameters are strictly controlled during the welding process to ensure a firm connection between the threaded block 24 and the weight adjustment block 23. A threaded hole is machined inside the threaded block 24, and its machining accuracy meets the requirements of relevant standards to ensure a high-precision fit with the screw rod 25. The screw rod 25 is installed on the slide rail 22 through a bearing. The screw rod 25 is made of high-strength alloy steel and undergoes a heat treatment process to improve its strength and wear resistance. The screw rod 25 is in threaded cooperation with the threaded block 24. When the screw rod 25 is rotated, the threaded block 24 is driven to move by using the principle of screw transmission of the thread, thereby realizing the precise adjustment of the position of the weight adjustment block 23 to meet the requirements of different weighing measurements.

[0038] Working principle:

[0039] When the bridge rotation weighing device is in use, first, according to the actual bridge rotation design parameters, select the weight blocks 12 with appropriate weight specifications and install them at the short end of the cantilever 11 through the embedded lifting rings and connecting bolts. Observe the pointer 20 and scale on the square plate 18 in the rotating assembly 10, rotate the drive shaft 17 to drive the rotating disk 19, the cantilever 11 and the weight blocks 12 to rotate, check whether the rotation of each component is smooth, whether there is jamming or abnormal noise. If there are problems, troubleshoot and adjust in time, and record the scale indicated by the pointer 20 at this time as the initial angle data.

[0040] If it is determined according to the previous calculation or on-site situation that the center of gravity distribution of the mounting plate 8 and the pier 9 needs to be adjusted, rotate the rotating rod 15 in the long slot 14 of the mounting plate 8, and the counterweight ball 16 at the bottom of the rotating rod 15 will move accordingly. According to the lever principle, change the position of the center of gravity. After the rotation is completed, use tools to tighten the nuts 21 on both sides of the rotating rod 15 to fix the rotating rod 15 at the corresponding position in the long slot 14 to prevent it from rotating during the measurement process.

[0041] According to the different force conditions simulated for the bridge rotation, rotate the screw rod 25 on the slide rail 22. The screw rod 25 is in threaded cooperation with the threaded block 24 at the bottom of the weight adjustment block 23, driving the weight adjustment block 23 to move along the length direction of the cantilever 11 on the slide rail 22. By changing the position of the weight adjustment block 23, adjust the weight distribution at the short end of the cantilever 11 according to the lever principle to simulate the force conditions of the bridge rotation under different working conditions. After each adjustment of the position of the weight adjustment block 23, observe the change of the pointer 20 of the rotating assembly 10, record the rotation angle data, and at the same time monitor the force and operating state of each component of the entire device to ensure safety and stability.

[0042] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bridge swivel weighing device, characterized in that: include: A fixed frame (1), wherein the fixed frame (1) is composed of a base frame (2), the base frame (2) is horizontally placed on a base surface, a support frame (3) is rotatably arranged above the base frame (2) through a bearing, so that the support frame (3) can rotate horizontally around a rotating axis with the base frame (2), the top of the support frame (3) is above the base frame (2), a slide groove (4) with a rectangular cross section is opened on the top of the support frame (3), the slide groove (4) extends in the transverse direction of the support frame (3), one end of a sliding rod (5) is located in the slide groove (4) and can slide along the length direction of the slide groove (4), the other end of the sliding rod (5) extends downward to the side of the base frame (2), the sliding rod (5) is rotatably arranged with a limiting sleeve (6), the limiting sleeve (6) is sleeved on the outer side wall of the base frame (2) and is located close to the connecting end of the sliding rod (5); A mounting plate (8), the mounting plate (8) being located above the top of the support frame (3) and fixedly connected to the top of the support frame (3) by means of high-strength bolts, the two being fitted together; A bridge pier (9), wherein the bridge pier (9) stands vertically at the center of the top of the mounting plate (8) and is vertically connected to the top of the mounting plate (8); A rotating assembly (10), wherein the rotating assembly (10) is above the top of the bridge pier (9), and the bottom of the rotating assembly (10) is fixedly connected to the center of the top of the bridge pier (9); A cantilever (11), wherein the cantilever (11) is located above the top of the rotating assembly (10), one end of the cantilever (11) is vertically welded to the top of the rotating assembly (10), and the cantilever (11) extends in a horizontal direction; A load-bearing block (12) is located at the short end of the cantilever (11) and is fixedly connected to the top of the short end of the cantilever (11).

2. The bridge swivel weighing device according to claim 1, characterized in that: The mounting plate (8) comprises a bottom plate (13) which is horizontally placed above the top of the support frame (3). A long groove (14) is provided on a large surface of the bottom plate (13) along the length direction. A rotating rod (15) is rotatably arranged at the central axis position of the long groove (14). The bottom of the rotating rod (15) passes through the long groove (14) downwardly and is connected to a counterweight ball (16). The top of the rotating rod (15) extends upwardly out of the long groove (14) and is welded to the center of the bottom of the pier (9).

3. The bridge swivel weighing device according to claim 1, characterized in that: The rotating assembly (10) comprises a driving shaft (17), the driving shaft (17) is vertically fixed at the center position of the top of the pier (9), and is connected to the top of the pier (9) through a key. The top of the driving shaft (17) extends upward and is fixedly connected to the center of a horizontally placed square plate (18). A rotating disk (19) is rotatably arranged above the top of the square plate (18) and at its center position. The rotating disk (19) is connected to the top of the driving shaft (17) through a spline, and the top of the rotating disk (19) is welded to the bottom center of one end of the cantilever (11).

4. The bridge swivel weighing device according to claim 3, characterized in that: The upper surface of the square plate (18) is engraved with scales along the circumferential direction, and a pointer (20) is fixedly arranged near the edge of the upper surface of the rotating disk (19), and the pointer (20) points to the scales on the square plate (18).

5. The bridge swivel weighing device according to claim 2, characterized in that: Nuts (21) are threadedly connected at the openings of the long slots (14) on both sides of the rotating rod (15).

6. The bridge rotation weighing device according to claim 5, characterized in that: It also includes a slide rail (22), which is horizontally fixed on the top of the short end of the cantilever (11) and extends along the length direction of the short end of the cantilever (11). A weight adjustment block (23) is slidably arranged on the top of the slide rail (22).

7. The bridge swivel weighing device according to claim 6, characterized in that: It also includes a threaded block (24), which is fixed at the center of the bottom of the weight adjustment block (23) and welded to the weight adjustment block (23). A screw rod (25) is rotatably arranged on the slide rail (22) and on the center line of the length direction thereof, and the screw rod (25) is connected to the threaded block (24) by threads.

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