Special test bed for highway bridge expansion device and operation method of special test bed

Abstract

The invention provides a test bench special for a highway bridge expansion device and an operation method thereof, and the test bench comprises a pedestal which is provided with two parallel rails; the clamping device is arranged on the base and is used for fixedly mounting a reinforced concrete test bridge pavement; the dynamic load simulation device comprises a pair of balance weight bases and a row of hydraulic telescopic pressure machine heads, each balance weight base is provided with a truss beam vertically extending upwards, a truss is arranged between the truss beams on the two sides, the row of hydraulic telescopic pressure machine heads are installed at the bottom of the truss, and each hydraulic telescopic pressure machine head is independently connected with a hydraulic pipeline. The hydraulic system is used for controlling stretching and pressure output according to actual traffic load data, and simulating the dynamic load generated in the vehicle driving process. By highly simulating the dynamic load condition in the actual traffic environment, the stress condition and performance of the telescopic device in actual use can be reflected more accurately.

Description

Technical Field

[0001] The invention relates to the technical field of highway bridge detection, and in particular to a special test bench for a highway bridge expansion device and an operating method thereof. Background Art

[0002] In highway bridge construction, the performance of expansion devices, as an important component of the bridge deck structure, is directly related to the safety of bridge use, traffic efficiency and long-term durability. The expansion device is mainly used to meet the expansion and contraction requirements of the bridge deck caused by temperature changes, vehicle loads, etc., to ensure that vehicles can pass smoothly while the bridge deck is freely expanding and contracting. However, there are still many deficiencies in the testing and inspection of highway bridge expansion devices, especially the lack of a dedicated test bench that can simulate load changes in actual use scenarios.

[0003] At present, most of the existing test equipment can only perform simple static load tests and cannot simulate the impact of vehicle dynamic loads on telescopic devices in actual traffic environments. At the same time, these devices also have certain limitations in test accuracy, test range, and degree of automation, making it difficult to meet the needs of modern bridge engineering for high-quality testing of telescopic devices. Summary of the invention

[0004] The purpose of the present invention is to provide a special test bench for a highway bridge expansion device and an operating method thereof in view of the deficiencies of the prior art.

[0005] The specific technical solutions are as follows:

[0006] A special test bench for a highway bridge expansion device, comprising:

[0007] a base with two parallel tracks disposed thereon;

[0008] A clamping device, arranged on the base, for fixing and installing the reinforced concrete test bridge pavement;

[0009] A dynamic load simulation device, comprising a pair of counterweight bases and a row of hydraulic telescopic press heads, each of the counterweight bases is provided with a truss beam extending vertically upward, a truss is provided between the truss beams on both sides, a row of the hydraulic telescopic press heads is installed at the bottom of the truss, each of the hydraulic telescopic press heads is individually connected to a hydraulic pipeline, and is used to control its telescopic and pressure output through the hydraulic system according to actual traffic load data, so as to simulate the dynamic load generated during vehicle driving;

[0010] a driving mechanism connected to the counterweight base, and used to control the counterweight base to move precisely on the track to simulate the dynamic driving of a vehicle on a bridge pavement; and

[0011] Position sensors are arranged around the expansion and contraction device at the end of the reinforced concrete test bridge pavement and are used to monitor the displacement changes of the expansion and contraction device in real time during the stress-bearing process.

[0012] Optionally, the driving mechanism includes a rack, a motor base plate, a driving motor and a gear; the rack is fixedly mounted on the track; the motor base plate is arranged at the bottom of the counterweight base; the driving motor is fixedly mounted on the motor base plate, and a gear is fixedly connected to its output shaft, and the gear is meshed with the rack, and the counterweight base is controlled to move precisely along the track by rotating the driving motor to realize the simulation of dynamic load.

[0013] Optionally, a roller is installed at the bottom of the counterweight base, a wheel groove is provided on the track, and the roller is installed in the wheel groove.

[0014] Optionally, the clamping device includes two fixed brackets, a base plate and a pressure plate, the two fixed brackets are arranged on a base, the base plate is fixedly installed between the two fixed brackets for supporting the reinforced concrete test bridge pavement, the pressure plate is located above the reinforced concrete test bridge pavement and is fixed to the base plate by bolts, and the reinforced concrete test bridge pavement is provided with bolt holes matching the bolts.

[0015] Optionally, the fixing bracket and the base are manufactured by integrally casting concrete.

[0016] Optionally, the head of the hydraulic telescopic press head is rotatably connected to a roller, and the axle of the roller is parallel to the truss.

[0017] Optionally, a pressure gauge for displaying the pressure value of the hydraulic telescopic press head is installed on the truss.

[0018] An operating method of a special test bench for a highway bridge expansion device comprises the following steps:

[0019] Step 1: firmly mount the reinforced concrete test bridge pavement on the test bench by means of the clamping device, and adjust the clamping position according to the test requirements to simulate the real bending moment at the end of the reinforced concrete test bridge pavement during actual use;

[0020] Step 2: Install position sensors around the telescopic device to monitor the displacement changes of the telescopic device in real time during the force application process;

[0021] Step 3: According to a preset load curve or actual traffic load data, the pressure of the hydraulic system is adjusted so that the hydraulic telescopic press head applies a dynamically changing pressure to the test bridge pavement to simulate the dynamic load generated during vehicle driving;

[0022] Step 4: The driving mechanism controls the translation of the dynamic load simulation device, and the hydraulic telescopic press head translates accordingly at the pressure test position on the test bridge pavement, thereby simulating the real load change of the vehicle moving on the bridge pavement;

[0023] Step 5: The position sensor records the displacement changes of the telescopic device in real time, and the pressure gauge displays the pressure value of each hydraulic telescopic press head. The data is recorded by the acquisition system and transmitted to the computer for analysis and processing.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention firmly mounts the reinforced concrete test bridge pavement on the test bench through a clamping device, and the clamping position can be changed according to the test requirements, thereby simulating the real bending moment of the end of the reinforced concrete test bridge pavement in actual use; a row of hydraulic telescopic press heads are installed at the bottom of the truss, and each press head is individually connected to a hydraulic pipeline, and its telescopic and pressure output are controlled by the hydraulic system. During the test, the pressure of the hydraulic system is adjusted according to the preset load curve or actual traffic load data, so that the hydraulic telescopic press head applies dynamically changing pressure to the test bridge pavement to simulate the dynamic load generated during vehicle driving. The present invention can more accurately reflect the stress conditions and performance of the telescopic device in actual use by highly simulating the dynamic load conditions in the actual traffic environment. Compared with traditional static load test equipment, the present invention not only supports static load testing, but also simulates dynamic load changes, covering a wider range of tests, and meeting the needs of bridge engineering for high-quality detection of telescopic devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of a special test bench for expansion and contraction devices of highway bridges;

[0027] Figure 2 It is a structural schematic diagram of a dynamic load simulation device;

[0028] Figure 3 It is a schematic diagram of the structure of the counterweight base and the track;

[0029] Figure 4 is a schematic diagram of the track structure;

[0030] Figure 5 It is a structural schematic diagram of the counterweight base and the driving mechanism;

[0031] Figure 6 It is a schematic diagram of the structure of the clamping device and the reinforced concrete test bridge pavement;

[0032] Figure 7 is a schematic diagram of the structure of the clamping device;

[0033] Figure 8 It is a structural schematic diagram of the hydraulic telescopic press head.

[0034] In the figure: 1. dynamic load simulation device; 2. counterweight base; 3. truss beam; 4. truss; 5. hydraulic telescopic press head; 6. hydraulic pipeline; 7. pressure gauge; 8. track; 9. wheel groove; 10. rack; 11. roller; 12. motor base plate; 13. drive motor; 14. gear; 15. test bridge pavement; 16. telescopic device; 17. clamping device; 18. fixed bracket; 19. bottom plate; 20. pressure plate; 21. bolt; 22. roller. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0037] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0038] The special test bench for the expansion device of a highway bridge provided in the present invention is referred to Figure 1-Figure 2 ,include:

[0039] A base, on which two parallel tracks 8 are arranged;

[0040] A clamping device 17, disposed on a base, for fixing and installing the reinforced concrete test bridge pavement 15;

[0041] A dynamic load simulation device 1 includes a pair of counterweight bases 2 and a row of hydraulic telescopic press heads 5, each counterweight base 2 is provided with a truss beam 3 extending vertically upward, a truss 4 is provided between the truss beams 3 on both sides, and a row of hydraulic telescopic press heads 5 is installed at the bottom of the truss 4, and each hydraulic telescopic press head 5 is individually connected to a hydraulic pipeline 6, which is used to control its telescopic and pressure output through the hydraulic system according to actual traffic load data, so as to simulate the dynamic load generated during the vehicle driving process;

[0042] A driving mechanism connected to the counterweight base 2, used to control the counterweight base 2 to move precisely on the track 8 to simulate the dynamic driving of a vehicle on a bridge road surface; and

[0043] Position sensors are arranged around the telescopic device 16 at the end of the reinforced concrete test bridge pavement 15, and are used to monitor the displacement changes of the telescopic device 16 in the process of being subjected to force in real time.

[0044] In this embodiment, the base is the main structure of the test bench, on which two parallel precision rails 8 are arranged. The rails 8 are made of high-strength materials to ensure the stability and accuracy of the test bench when carrying the dynamic load simulation device 1 and the reinforced concrete test bridge pavement 15; the clamping device 17 is located on the base to ensure that the pavement will not be displaced during the test and remain stable; the dynamic load simulation device 1 can control its expansion and contraction and pressure output through a precise hydraulic system according to actual traffic load data to simulate the dynamic load during vehicle driving; the driving mechanism is connected to the counterweight base 2, and the movement of the counterweight base 2 on the rails 8 is controlled by the driving mechanism to simulate the dynamic driving of the vehicle on the bridge pavement; the position sensor is installed around the expansion device 16 at the end of the reinforced concrete test bridge pavement 15, which is used to monitor the displacement changes of the expansion device 16 in the process of force in real time, and the collected data is transmitted to the computer through the data acquisition system for analysis and processing to evaluate the dynamic performance and durability of the expansion device 16. Through the combination of the above structures, this embodiment realizes the accurate simulation and test of the dynamic performance of the highway bridge expansion device 16 under actual traffic load.

[0045] In this embodiment, refer to Figure 3-Figure 5The driving mechanism includes a rack 10, a motor base plate 12, a driving motor 13 and a gear 14; the rack 10 is fixedly mounted on the track 8; the motor base plate 12 is arranged at the bottom of the counterweight base 2; the driving motor 13 is fixedly mounted on the motor base plate 12, and a gear 14 is fixedly connected to its output shaft, and the gear 14 is meshed with the rack 10. The rotation of the driving motor 13 controls the counterweight base 2 to move precisely along the track 8 to realize the simulation of dynamic load. Among them, the rack 10 is made of high-precision materials, which ensures the precise meshing of the rack 10 and the gear 14, thereby realizing the smooth and stable movement of the counterweight base 2 on the track 8. The length and precision design of the rack 10 match the dynamic load simulation range of the test bench, ensuring the precise control of the dynamic load during the simulation process; the design of the motor base plate 12 takes into account the weight distribution and stability, ensuring the stability and efficiency of the drive motor 13 when working. The drive motor 13 uses a high-torque, low-noise servo motor, which can accurately control the speed and torque to achieve the precise control requirements in the dynamic load simulation; the matching accuracy of the gear 14 and the rack 10 is high, ensuring the accuracy of the moving speed and position control of the counterweight base 2 on the track 8, and can simulate the dynamic loads of various vehicles during driving according to the test needs; through the precise control of the drive motor 13, the gear 14 drives the rack 10 to move, thereby controlling the counterweight base 2 to perform precise reciprocating motion on the track 8, simulating the dynamic load of the vehicle when driving on the bridge road surface. The rotation speed and direction of the motor are precisely adjusted by the control system, which can simulate the vehicle driving state under different speeds and different load conditions, providing a reliable simulation environment for the dynamic performance test of the highway bridge expansion device 16; the test bench is equipped with an advanced control system and data acquisition system, which can monitor the rotation speed of the drive motor 13, the moving speed and position of the counterweight base 2, and various parameters during the dynamic load simulation process in real time. These data are recorded and analyzed in real time, providing a scientific basis for the dynamic performance evaluation of the highway bridge expansion device 16.

[0046] Specifically, refer to Figure 3-Figure 4 , a roller 11 is installed at the bottom of the counterweight base 2, a wheel groove 9 is provided on the track 8, and the roller 11 is installed in the wheel groove 9. The cooperation between the roller 11 and the wheel groove 9 reduces the friction force, making the movement of the counterweight base 2 on the track 8 smoother, reducing energy loss and improving driving efficiency. In tribology, rolling friction is much smaller than sliding friction. Therefore, the use of roller 11 can significantly reduce friction resistance during movement. The cooperation between the roller 11 and the wheel groove 9 reduces the nonlinear factors during movement, allowing the counterweight base 2 to more accurately simulate the dynamic load of the vehicle on the bridge, and improving the simulation accuracy of the test bench.

[0047] In this embodiment, refer to Figure 6-Figure 7The clamping device 17 includes two fixed brackets 18, a bottom plate 19 and a pressure plate 20. The two fixed brackets 18 are installed on the base to form a stable support structure. The bottom plate 19 is fixedly installed between the two fixed brackets 18 to provide a flat and stable bearing platform for the reinforced concrete test bridge pavement 15. The pressure plate 20 is located above the reinforced concrete test bridge pavement 15. The reinforced concrete test bridge pavement 15 is firmly fixed on the bottom plate 19 by the pre-tightening force of the bolt 21 to prevent any displacement or deformation during the dynamic load simulation process. The reinforced concrete test bridge pavement 15 is provided with a bolt 21 hole matching the bolt 21. The coordination of the bolt 21 and the bolt 21 hole, as well as the pressure of the pressure plate 20 on the reinforced concrete test bridge pavement 15, follow the fastening principle of fasteners in mechanical engineering, and ensure the reliability of the clamping device 17 and the stability of the reinforced concrete test bridge pavement 15. Through the structural design of the clamping device 17, the reinforced concrete test bridge pavement 15 can remain stable when subjected to various forces during the dynamic load simulation process, avoiding the accuracy of the test results affected by the displacement or deformation of the pavement.

[0048] Specifically, refer to Figure 6 and Figure 7 The fixed bracket 18 and the base are made by integrally casting concrete. Connecting piles are pre-buried in the base. The fixed bracket 18 is fixedly connected to the base by welding, and then formed by concrete casting. The integral casting of concrete ensures the structural integrity between the fixed bracket 18 and the base, reduces the weak links at the connection, and improves the rigidity and stability of the overall structure. In structural engineering, the principle of integrity emphasizes the close connection of various parts of the structure to improve the overall performance. And concrete, as the main building material, has high compressive strength and good durability. The integrally cast fixed bracket 18 and the base can withstand various forces generated during the dynamic load simulation process, while maintaining the stability and integrity of the structure during long-term use.

[0049] In this embodiment, refer to Figure 8The head of the hydraulic telescopic press head 5 is rotatably connected to a roller 22, and the axle of the roller 22 is parallel to the truss 4. The introduction of the roller 22 reduces the direct contact between the hydraulic telescopic press head 5 and the test bridge pavement 15 when applying a dynamic load, thereby reducing friction and ensuring the accurate transmission of the dynamic load. At the same time, the design of the axle being parallel to the truss 4 ensures the balance of the roller 22 during movement, prevents eccentric loading, and ensures uniform distribution of force. Through the contact between the roller 22 and the test bridge pavement 15, the hydraulic telescopic press head 5 can smoothly and evenly transfer the dynamic load to the test bridge pavement 15, simulating the dynamic stress state under actual traffic loads, and providing a real and reliable environment for the performance test of the telescopic device 16. In addition, the design of the roller 22 also takes into account the wear resistance and load-bearing capacity of the material, ensuring long-term stability and durability when subjected to dynamic loads, while reducing stress concentration and avoiding damage to the test bridge pavement 15 or the hydraulic telescopic press head 5 caused by excessive local stress.

[0050] Reference Figure 2 A pressure gauge 7 for displaying the pressure value of the hydraulic telescopic press head 5 is installed on the truss 4. The pressure gauge 7 measures the pressure value of the hydraulic telescopic press head 5 by sensing the change in fluid pressure in the hydraulic system. In the hydraulic system, pressure is transmitted through the compressibility of the fluid (usually oil), and the pressure gauge 7 can accurately capture this change and provide real-time pressure readings. Modern pressure gauges 7 usually integrate sophisticated sensor technology, which can convert the pressure changes of the hydraulic system into electrical signals, which are then processed by electronic circuits and displayed on the dashboard to provide intuitive pressure readings. In addition, the pressure gauge 7 can not only display the current pressure value, but also be connected to the data acquisition system to record pressure change data in real time, which is convenient for test data analysis and result verification.

[0051] The operating method of the special test bench for highway bridge expansion device provided by the present invention comprises the following steps:

[0052] Step 1: firmly mount the reinforced concrete test bridge pavement 15 on the test bench by means of the clamping device 17, and adjust the clamping position according to the test requirements to simulate the real bending moment at the end of the reinforced concrete test bridge pavement 15 in actual use;

[0053] Step 2: Install position sensors around the telescopic device 16 to monitor the displacement change of the telescopic device 16 in real time during the force application process;

[0054] Step 3: According to the preset load curve or actual traffic load data, the pressure of the hydraulic system is adjusted so that the hydraulic telescopic press head 5 applies a dynamically changing pressure to the test bridge pavement 15 to simulate the dynamic load generated during vehicle driving;

[0055] Step 4: The driving mechanism controls the dynamic load simulation device 1 to translate, and the hydraulic telescopic press head 5 translates accordingly at the pressure test position of the test bridge pavement 15, thereby realizing the real load change of the simulated vehicle moving on the bridge pavement;

[0056] Step 5: The position sensor records the displacement change of the telescopic device 16 in real time, and the pressure gauge 7 displays the pressure value of each hydraulic telescopic press head 5. The data is recorded by the acquisition system and transmitted to the computer for analysis and processing.

[0057] In summary, the method of the present invention can highly restore the dynamic load environment of the bridge in actual use, including pressure changes, displacement and bending moment during vehicle driving, through the precise installation and adjustment of the clamping device 17 and the simulation of dynamic load by the hydraulic telescopic press head 5, and provide a real and reliable test platform for the performance evaluation of the telescopic device 16; the real-time monitoring of the position sensor and the accurate reading of the pressure gauge 7, combined with the recording and transmission of the data acquisition system, ensure the integrity and accuracy of the test data, which are crucial for subsequent analysis and processing, and can help engineers deeply understand the behavioral characteristics of the telescopic device 16 under different load conditions, and provide a scientific basis for optimizing design and improving performance. Through the dynamic adjustment of the hydraulic system pressure and the control of the dynamic load simulation device 1 by the driving mechanism, the test bench can simulate the dynamic load changes generated when the vehicle moves on the bridge pavement. This process not only tests the instantaneous response capability of the telescopic device 16, but also puts forward requirements for its durability and adaptability, which is an important link in evaluating its overall performance. The operation method of the test bench can provide detailed data on the performance of the telescopic device 16, including its displacement changes, pressure response and durability performance under various dynamic load conditions. These data are of great value for the design optimization, material selection and maintenance strategy formulation of bridge engineering, and help improve the overall safety and service life of bridge structures. Through precise test methods and data analysis, the test bench can promote the continuous advancement of bridge expansion device 16 technology and promote the application of new materials, new designs and new processes. At the same time, the test results can be used as a reference for the formulation or revision of industry standards, promoting the standardization and normalization of the entire bridge engineering industry.

[0058] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A special test bench for highway bridge expansion device, characterized in that: include: a base with two parallel tracks disposed thereon; A clamping device, arranged on the base, for fixing and installing the reinforced concrete test bridge pavement; A dynamic load simulation device, comprising a pair of counterweight bases and a row of hydraulic telescopic press heads, each of the counterweight bases is provided with a truss beam extending vertically upward, a truss is provided between the truss beams on both sides, a row of the hydraulic telescopic press heads is installed at the bottom of the truss, each of the hydraulic telescopic press heads is individually connected to a hydraulic pipeline, and is used to control its telescopic and pressure output through the hydraulic system according to actual traffic load data, so as to simulate the dynamic load generated during vehicle driving; A driving mechanism connected to the counterweight base, used to control the counterweight base to move precisely on the track to simulate the dynamic driving of a vehicle on a bridge pavement; as well as Position sensors are arranged around the expansion and contraction device at the end of the reinforced concrete test bridge pavement and are used to monitor the displacement changes of the expansion and contraction device in real time during the stress-bearing process.

2. The special test bench for highway bridge expansion device according to claim 1 is characterized in that: The driving mechanism includes a rack, a motor base plate, a driving motor and a gear; the rack is fixedly mounted on the track; the motor base plate is arranged at the bottom of the counterweight base; the driving motor is fixedly mounted on the motor base plate, and a gear is fixedly connected to its output shaft, and the gear is meshed with the rack. The counterweight base is controlled to move precisely along the track through the rotation of the driving motor to realize the simulation of dynamic load.

3. The special test bench for highway bridge expansion device according to claim 1 is characterized in that: A roller is installed at the bottom of the counterweight base, a wheel groove is provided on the track, and the roller is installed in the wheel groove.

4. The special test bench for highway bridge expansion device according to claim 1 is characterized in that: The clamping device includes two fixed brackets, a base plate and a pressure plate. The two fixed brackets are arranged on a base. The base plate is fixedly installed between the two fixed brackets for supporting the reinforced concrete test bridge pavement. The pressure plate is located above the reinforced concrete test bridge pavement and is fixed to the base plate by bolts. The reinforced concrete test bridge pavement is provided with bolt holes matching the bolts.

5. The special test bench for highway bridge expansion device according to claim 4 is characterized in that: The fixing bracket and the base are made by integrally casting concrete.

6. The special test bench for highway bridge expansion device according to claim 1 is characterized in that: The head of the hydraulic telescopic press head is rotatably connected with a roller, and the axle of the roller is parallel to the truss.

7. The special test bench for highway bridge expansion device according to claim 1 is characterized in that: A pressure gauge for displaying the pressure value of the hydraulic telescopic press head is installed on the truss.

8. The operating method of the special test bench for highway bridge expansion device according to any one of claims 1 to 7 is characterized in that: The following steps are involved: Step 1: firmly mount the reinforced concrete test bridge pavement on the test bench by means of the clamping device, and adjust the clamping position according to the test requirements to simulate the real bending moment at the end of the reinforced concrete test bridge pavement during actual use; Step 2: Install position sensors around the telescopic device to monitor the displacement changes of the telescopic device in real time during the force application process; Step 3: According to a preset load curve or actual traffic load data, the pressure of the hydraulic system is adjusted so that the hydraulic telescopic press head applies a dynamically changing pressure to the test bridge pavement to simulate the dynamic load generated during vehicle driving; Step 4: The driving mechanism controls the translation of the dynamic load simulation device, and the hydraulic telescopic press head translates accordingly at the pressure test position on the test bridge pavement, thereby simulating the real load change of the vehicle moving on the bridge pavement; Step 5: The position sensor records the displacement changes of the telescopic device in real time, and the pressure gauge displays the pressure value of each hydraulic telescopic press head. The data is recorded by the acquisition system and transmitted to the computer for analysis and processing.

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