Highway bridge bearing capacity detection device

Abstract

The highway bridge bearing capacity detection device comprises a shell, a working cavity is machined in one side of the shell, and a protective door is hinged to the opening position of the working cavity; and the clamping mechanism comprises hydraulic machines and clamps, the two hydraulic machines are installed on the left side and the right side of the shell respectively, output shafts of the hydraulic machines extend into the working cavity, and the ends of the output shafts are fixedly connected with the clamps used for fixing highway bridge samples. The invention relates to the technical field of highway bridge detection. According to the highway bridge bearing capacity detection device, through the arranged detection assembly, when the highway bridge is pressed to detect the bearing capacity, automatic pressurization can be performed according to deformation of the highway bridge, so that the highway bridge is subjected to stable pressure in the detection process, and the detection precision of the highway bridge bearing capacity can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of highway bridge detection, and in particular to a highway bridge bearing capacity detection device. Background Art

[0002] Highway bridges are structures designed for highways and other road traffic, primarily used to cross obstacles such as rivers, canyons, and other traffic routes to ensure smooth and safe traffic. Load-bearing capacity testing is an important means of evaluating whether bridges and other structures can safely carry their designed loads during use. Testing the load-bearing capacity of bridges can promptly identify potential safety hazards, ensuring traffic safety and the long-term use of the structure.

[0003] In the existing technology, when testing the bearing capacity of a highway bridge, the most intuitive and popular way is to apply static load pressure to the highway bridge. Therefore, the accuracy of the measured value and the theoretical calculated value have a great impact on the evaluation structure.

[0004] However, since the values of the static parameters of the bridge structure will change under the test load, the deformation amplitude of the parts far away from the support will be larger than that of the parts close to the support. This results in that when the hydraulic press moves from a position close to the support of the highway bridge to a position far away from the support with the support platform unchanged, the parts far away from the support will release the hydraulic press slightly due to the increased compression deformation amplitude, resulting in a slight decrease in the pressure applied by the hydraulic press on the highway bridge. The static load force on the bridge after deformation is reduced, which affects the detection accuracy.

[0005] Therefore, those skilled in the art provide a device for detecting the bearing capacity of a highway bridge to solve the problems raised in the above background technology. Summary of the Invention

[0006] The purpose of the present invention is to provide a device for detecting the bearing capacity of a highway bridge to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions: The above technical objectives of the present invention are achieved through the following technical solutions: A highway bridge load-bearing capacity detection device comprises a housing, a working chamber is formed on one side of the housing, and a protective door is hinged at the opening of the working chamber; The clamping mechanism includes a hydraulic press and a clamp. Two hydraulic presses are provided and are respectively installed on the left and right sides of the housing. The output shaft of the hydraulic press extends into the working chamber. The end of the output shaft is fixedly connected to a clamp for fixing the highway bridge sample. The linear drive unit includes a mounting frame, a guide rail, and a slide. The mounting frame is fixedly connected to the top of the working chamber. A slide groove is provided at the bottom of the mounting frame. The front and rear sides of the slide groove are fixedly connected to the guide rail. The bottom of the guide rail is slidably connected to the slide. The detection component is mainly composed of a high-pressure oil tank, an intermediate cylinder, a hydraulic cylinder, a pressure sensor and a lower pressure block. The high-pressure oil tank is fixedly connected to the bottom of the slide. The front and rear sides of the high-pressure oil tank are connected to the intermediate cylinder through a connecting pipe. The side of the intermediate cylinder away from the high-pressure oil tank is connected to the hydraulic cylinder through a connecting pipe. The high-pressure oil tank inputs hydraulic oil into the hydraulic cylinder through the intermediate cylinder. The output shaft of the hydraulic cylinder is fixedly connected to the lower pressure block for squeezing the highway bridge sample, and a pressure sensor is provided at the connection. The inner wall of the intermediate cylinder is fixedly connected to a supporting mesh plate on the side close to the connecting pipe 2, and the side of the supporting mesh plate away from the connecting pipe 2 is fixedly connected to the hydraulic cylinder 2. The output shaft of the hydraulic cylinder 2 is fixedly connected to a block for blocking the connecting pipe 1. The top of the hydraulic cylinder 2 is fixedly connected to the pressure cylinder, and the pressure cylinder is connected to the oil filling hole of the hydraulic cylinder 2. The top of the pressure cylinder extends out of the intermediate cylinder, and the outer wall of the pressure cylinder is located above the intermediate cylinder and is fixedly connected to a return pipe. The end of the return pipe away from the pressure cylinder is connected to the hydraulic cylinder 1 through a reflux unit.

[0008] Furthermore, the hydraulic cylinder 1 includes a cylinder body, a piston and a connecting rod. The top of the outer wall of the cylinder body is connected to the connecting pipe 2. The piston is slidably connected in the cylinder body. The bottom of the piston is fixedly connected to the connecting rod. The end of the connecting rod away from the piston extends out of the cylinder body and is fixedly connected to the lower pressure block.

[0009] Furthermore, the reflux unit includes a second pressure sensor and a solenoid valve. The inner top wall of the cylinder body is fixedly connected to the solenoid valve. The top of the solenoid valve is connected to the reflux pipe. A second pressure sensor is provided on one side of the solenoid valve.

[0010] Furthermore, a support ring is fixedly connected to the inner top wall of the cylinder body, and the bottom of the support ring is lower than the bottom of the solenoid valve and the second pressure sensor.

[0011] Furthermore, an extrusion groove is provided on the inner wall of the pressure cylinder, and the extrusion groove is arranged above the output port of the reflux pipe. A baffle is slidably connected in the extrusion groove, and a spring is fixedly connected between the top of the baffle and the extrusion groove.

[0012] Furthermore, a crawler is rotatably provided at the bottom of the lower pressing block, and at least two rotating rollers are spaced apart inside the crawler.

[0013] Furthermore, a placement groove is provided on the top of the clamp, and a pressure plate for pressing the highway bridge sample is slidably connected above the placement groove.

[0014] Furthermore, the linear drive unit also includes a motor and a screw rod. The motor is fixedly connected to one side of the mounting frame, and the output shaft of the motor is fixedly connected to the screw rod. The screw rod is arranged between the two guide rails and is threadedly connected to the slide.

[0015] Furthermore, a plurality of support columns are connected to the top of the hydraulic cylinder 1 at intervals, the top ends of the support columns are in contact with the slide, and the support columns are away from the return pipe.

[0016] In summary, the present invention includes at least one of the following beneficial technical effects: 1. This device for testing the bearing capacity of a highway bridge, through the detection components provided, can automatically apply pressure according to the deformation of the highway bridge when applying pressure to test the bearing capacity of the highway bridge, so as to ensure that the highway bridge is subjected to stable pressure during the testing process, thereby improving the testing accuracy of the highway bridge's bearing capacity; 2. This highway bridge load-bearing capacity testing device, through the provision of a return pipe, a return unit, and a pressure cylinder, allows the testing component to automatically increase the intensity of the next round of testing after completing one round of testing, making the step-by-step testing of the highway bridge load-bearing capacity more efficient and enabling the upper limit of the highway bridge load-bearing capacity to be measured more effectively. 3. This highway bridge load-bearing capacity detection device, through the provided crawler and rotating roller, can provide protection for the hydraulic cylinder while minimizing the impact on the contact area between the lower pressure block and the highway bridge, and can effectively reduce the maintenance frequency of the highway bridge load-bearing capacity detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a structural schematic diagram of a highway bridge bearing capacity detection device of the present invention.

[0019] Figure 2 It is a structural schematic diagram of a highway bridge bearing capacity detection device of the present invention when the protective door is open.

[0020] Figure 3 It is a cross-sectional view of a highway bridge bearing capacity detection device of the present invention.

[0021] Figure 4 It is a structural schematic diagram of a linear drive unit of a highway bridge bearing capacity detection device in an upward perspective according to the present invention.

[0022] Figure 5 It is a structural schematic diagram of the detection components of a highway bridge load-bearing capacity detection device of the present invention from the left side perspective.

[0023] Figure 6 It is a schematic diagram of the internal structure of a pressure cylinder in a highway bridge bearing capacity detection device of the present invention.

[0024] Figure 7 It is a structural schematic diagram of a reflux unit in a highway bridge bearing capacity detection device of the present invention.

[0025] Figure 8 It is a structural schematic diagram of a linear drive unit in a right side perspective of a highway bridge bearing capacity detection device of the present invention.

[0026] Figure 9 It is a schematic diagram of the state of a highway bridge bearing capacity detection device of the present invention when detecting a highway bridge sample.

[0027] In the figure, 1. housing; 2. clamping mechanism; 201. hydraulic press; 202. fixture; 3. linear drive unit; 301. mounting frame; 302. guide rail; 303. slide; 304. motor; 305. screw; 4. detection assembly; 401. high-pressure oil tank; 402. intermediate cylinder; 403. hydraulic cylinder 1; 4031. cylinder body; 4032. piston; 4033. connecting rod; 404. pressure sensor 1; 405. lower pressure block; 5. Working chamber; 6. Protective door; 7. Slide; 8. Connecting pipe 1; 9. Connecting pipe 2; 10. Support mesh plate; 11. Hydraulic cylinder 2; 12. Block; 13. Pressure cylinder; 14. Return pipe; 15. Return unit; 1501. Pressure sensor 2; 1502. Solenoid valve; 16. Support ring; 17. Extrusion groove; 18. Baffle; 19. Spring; 20. Track; 21. Rotating roller; 22. Placement groove; 23. Pressure plate; 24. Support column. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: Example

[0029] Reference Figure 1 - Figure 9 The present invention discloses a road bridge bearing capacity detection device, comprising a housing 1, a working chamber 5 formed on one side of the housing 1, and a protective door 6 hinged at the opening of the working chamber 5; The clamping mechanism 2 includes a hydraulic press 201 and a clamp 202. Two hydraulic presses 201 are provided and are respectively installed on the left and right sides of the housing 1. The output shaft of the hydraulic press 201 extends into the working chamber 5. The end of the output shaft is fixedly connected to the clamp 202 for fixing the highway bridge sample. The linear drive unit 3 includes a mounting frame 301, a guide rail 302, and a slide 303. The mounting frame 301 is fixedly connected to the top of the working chamber 5. A slide groove 7 is provided at the bottom of the mounting frame 301. The front and rear sides of the slide groove 7 are fixedly connected to the guide rail 302. The bottom of the guide rail 302 is slidably connected to the slide 303. The detection component 4 mainly consists of a high-pressure oil tank 401, an intermediate cylinder 402, a hydraulic cylinder 1 403, a pressure sensor 1 404 and a lower pressing block 405. The high-pressure oil tank 401 is fixedly connected to the bottom of the slide 303. The front and rear sides of the high-pressure oil tank 401 are connected to the intermediate cylinder 402 via a connecting pipe 1 8. The side of the intermediate cylinder 402 away from the high-pressure oil tank 401 is connected to the hydraulic cylinder 1 403 via a connecting pipe 2 9, so that the high-pressure oil tank 401 inputs hydraulic oil into the hydraulic cylinder 1 403 through the intermediate cylinder 402. The output shaft of the hydraulic cylinder 1 403 is fixedly connected to the lower pressing block 405 for squeezing the highway bridge sample, and a pressure sensor 1 404 is provided at the connection; The inner wall of the intermediate cylinder 402 is fixedly connected to a support mesh plate 10 on the side close to the connecting pipe 2 9, and the support mesh plate 10 is fixedly connected to a hydraulic cylinder 2 11 on the side away from the connecting pipe 2 9. The output shaft of the hydraulic cylinder 2 11 is fixedly connected to a block 12 for blocking the connecting pipe 1 8. The top of the hydraulic cylinder 2 11 is fixedly connected to a pressure cylinder 13, and the pressure cylinder 13 is connected to the oil filling hole of the hydraulic cylinder 2 11. The top of the pressure cylinder 13 extends out of the intermediate cylinder 402, and the outer wall of the pressure cylinder 13 is located above the intermediate cylinder 402 and is fixedly connected to a return pipe 14. The end of the return pipe 14 away from the pressure cylinder 13 is connected to the hydraulic cylinder 1 403 through a reflux unit 15.

[0030] In this embodiment, the observation Figure 1 and Figure 2 It can be found that a shell 1 is provided, a working chamber 5 is opened inside the shell 1, and the left and right outer walls of the shell 1 are fixedly connected with a hydraulic press 201. The output shaft of the hydraulic press 201 extends into the working chamber 5, and a clamp 202 is fixedly connected at the output end, which can be used to fix the highway bridge sample.

[0031] Then, the samples for testing were reproduced according to the specifications of the highway bridge. Figure 2 The sample is placed between two clamps 202, and the hydraulic press 201 is started to clamp the sample with the two clamps 202, thus completing the preparation process for highway bridge inspection.

[0032] Then, look at Figure 3 and Figure 4 It can be found that Figure 3 It is a schematic diagram of the three-dimensional structure of the highway bridge bearing capacity detection device from a cross-sectional perspective. Figure 4This is a structural diagram of the linear drive unit 3. At this time, we can see that the top of the working chamber 5 is fixedly connected to the mounting bracket 301, the bottom of the mounting bracket 301 is provided with a slide groove 7, the front and rear sides of the slide groove 7 are fixedly connected with guide rails 302, and there is a slide 303 sliding on the two guide rails 302, which allows the slide 303 to perform linear motion along the length direction of the slide groove 7.

[0033] Now look towards Figure 4 It can be found that the bottom of the slide 303 is fixedly connected to a high-pressure oil tank 401, and both sides of the high-pressure oil tank 401 are connected to a hydraulic cylinder 1 403. The output shaft of the hydraulic cylinder 1 403 is fixedly connected to a pressing block 405 for pressing down the highway bridge. When the highway bridge sample is installed, the hydraulic oil is input into the hydraulic cylinder 1 403 through the high-pressure oil tank 401, and then the output shaft of the hydraulic cylinder 1 403 pushes the pressing block 405 downward, which can be used to apply pressure to the highway bridge sample. Figure 5 It can be found that Figure 5 It is a structural diagram of the detection component 4 from the left side perspective of the highway bridge load-bearing capacity detection device. At this time, it can be found that a pressure sensor 404 is provided at the connection position between the output shaft of the hydraulic cylinder 403 and the lower pressure block 405, which can be used to detect the pressure exerted on the highway bridge. At the same time, it cooperates with the linear drive unit 3 to move during the pressure application process, so that it can be used to detect the load-bearing capacity of the highway bridge sample.

[0034] When vehicles travel on the bridge, dynamic loads are generated. This load includes not only static gravity but also additional stress caused by vehicle movement. This dynamic effect causes the bridge to experience periodic stress changes during use, causing fatigue and deformation of the material. Therefore, during the load-bearing capacity test, the highway bridge sample will also fatigue and deform due to pressure. At this time, the state of the highway bridge sample will be as follows: Figure 2 As shown in the state, the compressed part will have a slight depression (the depression is slightly enlarged in the figure to make it more obvious). If the pressing block 405 is not at the bottom of the depression at this time, as the linear drive unit 3 runs, the distance between the compressed part of the highway bridge and the slide 303 will increase when the detection component 4 moves forward, which will cause the hydraulic cylinder 403 that was originally in a compressed state to be slightly released, thereby reducing the pressure on the pressing block 405 and affecting the bridge bearing capacity detection.

[0035] So observe Figure 5 It can be found that by setting an intermediate cylinder 402 between the high-pressure oil tank 401 and the hydraulic cylinder 1 403, the intermediate cylinder 402 is connected to the high-pressure oil tank 401 through the connecting pipe 1 8 and is connected to the hydraulic cylinder 1 403 through the connecting pipe 2 9. At this time, the hydraulic oil needs to pass through the intermediate cylinder 402 to enter the hydraulic cylinder 1 403.

[0036] And in Figure 5 It can also be seen that the inner wall of the intermediate cylinder 402 is fixedly connected to a support mesh plate 10 on the side close to the connecting pipe 29, and the support mesh plate 10 is fixedly connected to a hydraulic cylinder 2 11 on the side away from the connecting pipe 29. The output shaft of the hydraulic cylinder 2 11 is fixedly connected to a block 12 for blocking the connecting pipe 18, and the top of the hydraulic cylinder 2 11 is fixedly connected to a pressure cylinder 13, and the pressure cylinder 13 is connected to the oil filling hole of the hydraulic cylinder 2 11. At this time, if the hydraulic oil wants to enter the hydraulic cylinder 1 403, it is necessary to apply a pressure exceeding the load of the hydraulic cylinder 2 11, so that the hydraulic cylinder 2 11 triggers the protection mechanism, so that the hydraulic oil in the hydraulic cylinder 2 11 is temporarily pressed into the pressure cylinder 13, and the output shaft of the hydraulic cylinder 2 11 is retracted, so that the block 12 is separated from the connecting pipe 8, and the hydraulic oil can enter the intermediate cylinder 402 and pass through the support cylinder 402 in the intermediate cylinder 402. The mesh plate 10 can enter the hydraulic cylinder 1 403, and as the hydraulic oil is injected into the hydraulic cylinder 1 403, the hydraulic cylinder 1 403 will extend the output shaft to push the lower pressure block 405 close to the highway bridge. After the lower pressure block 405 contacts the highway bridge, as the hydraulic oil continues to be injected, the hydraulic pressure in the hydraulic cylinder 1 403 will increase, so that the hydraulic oil in the hydraulic cylinder 1 403 will resist the injection of the hydraulic oil in the high-pressure oil tank 401. At this time, under the resistance of the hydraulic oil in the hydraulic cylinder 1 403, the pressure exerted by the hydraulic oil of the high-pressure oil tank 401 on the block 12 will decrease. At this time, the hydraulic oil injected into the pressure cylinder 13 in the hydraulic cylinder 2 11 will flow back, allowing the hydraulic cylinder 2 11 to re-block the connecting pipe 1 8, so as to control the hydraulic pressure in the hydraulic cylinder 1 403, thereby controlling the pressure exerted by the lower pressure block 405 on the highway bridge.

[0037] For example, the pressure that needs to be applied to the highway bridge is X. First, hydraulic oil is injected into the hydraulic cylinder 11 to make the hydraulic cylinder 11 push the block 12 to block the connecting pipe 8 with a pressure of X. Then, when the highway bridge needs to be inspected, the high-pressure oil tank 401 needs to inject hydraulic oil into the hydraulic cylinder 1 403. Therefore, the hydraulic pressure of the high-pressure oil tank 401 needs to be greater than the supporting force of the hydraulic cylinder 11, so that the hydraulic cylinder 11 triggers the protection mechanism to open, and then the hydraulic oil can enter the hydraulic cylinder 1 403. Since the output shaft of the hydraulic cylinder 1 403 is in a retracted state in the initial state, the output shaft of the hydraulic cylinder 1 403 will continue to extend when the hydraulic oil is injected, and will not be resisted during the extension process, so no pressure will be applied to the hydraulic oil in the hydraulic cylinder 1 403. Therefore, at this time, the high The hydraulic oil in the oil pressure tank 401 will continue to flow into the hydraulic cylinder 1 403. After the lower pressing block 405 contacts the highway bridge, the lower pressing block 405 is resisted by the highway bridge, causing the hydraulic oil in the hydraulic cylinder 1 403 to be in a pressurized state. Since the liquid is almost incompressible, the hydraulic oil continued to be injected into the high-pressure oil tank 401 will be resisted by the hydraulic cylinder 1 403, and the hydraulic pressure in the hydraulic cylinder 1 403 will be increased instantly. Under the resistance of the hydraulic oil in the hydraulic cylinder 1 403, the pressure on the blocking block 12 is reduced. At this time, the pressure on the hydraulic cylinder 2 11 will be reduced, and the hydraulic oil stored in the pressure cylinder 13 will flow back to allow the hydraulic cylinder 2 11 to block the connecting pipe 1 8, so that the hydraulic cylinder 1 403 remains in a pressurized state, so that the hydraulic cylinder 1 403 applies a stable pressure to the highway bridge.

[0038] When the highway bridge is deformed, as the downward pressing block 405 continues to move forward, the pressure exerted by the downward pressing block 405 on the highway bridge will gradually decrease. Since the downward pressing block 405 is suspended above the highway bridge, when the downward pressing block 405 and the highway bridge are in contact but not under pressure, the hydraulic pressure in the hydraulic cylinder 403 will disappear. At this time, the hydraulic oil in the high-pressure oil tank 401 will once again break through the blockage 12 and enter the hydraulic cylinder 403, so that the hydraulic cylinder 403 can exert a stable pressure on the highway bridge, so as to simulate the scenario that the car will always keep pressing down on the highway bridge under the action of gravity, which can effectively improve the detection accuracy of the bearing capacity of the highway bridge.

[0039] Due to the concave deformation process, the highway bridge will experience two scenes, uphill and downhill. Although the setting of the middle cylinder 402 enables the downward pressure block 405 to always maintain the state of exerting pressure on the highway bridge during the downhill process, during the uphill process, as the distance between the top surface of the highway bridge and the slide 303 gradually shortens, the pressure exerted by the downward pressure block 405 on the highway bridge will gradually increase, which will affect the detection accuracy of the latter half.

[0040] So in Figure 5It can be found that the top of the pressure cylinder 13 extends out of the intermediate cylinder 402, and the outer wall of the pressure cylinder 13 is located above the intermediate cylinder 402 and is fixedly connected to the return pipe 14. The end of the return pipe 14 away from the pressure cylinder 13 is connected to the hydraulic cylinder 403 through the return unit 15. At this time, when the hydraulic pressure in the hydraulic cylinder 403 exceeds the current detection pressure parameter, the return unit 15 will open, allowing the hydraulic oil to pass through the return pipe 14 into the pressure cylinder 13, which can be used to maintain a stable pressure in the second half of the highway bridge detection and improve the detection effect.

[0041] At the same time, the hydraulic oil flowing back into the pressure cylinder 13 will reduce the space inside the pressure cylinder 13, thereby increasing the pressure inside the pressure cylinder 13, and increasing the pressure of the hydraulic oil in the high-pressure oil tank 401 to enter the hydraulic cylinder 403, thereby increasing the pressure applied to the highway bridge after the hydraulic oil is injected into the hydraulic cylinder 403, and automatically increasing the difficulty of the next inspection when the highway bridge passes the current bearing capacity inspection.

[0042] In a further preferred embodiment of the present invention, Figure 5 - Figure 7 As shown, the hydraulic cylinder 1 403 includes a cylinder body 4031, a piston 4032 and a connecting rod 4033. The top of the outer wall of the cylinder body 4031 is connected to the connecting pipe 2 9. The piston 4032 is slidably connected in the cylinder body 4031. The bottom of the piston 4032 is fixedly connected to the connecting rod 4033. The end of the connecting rod 4033 away from the piston 4032 extends out of the cylinder body 4031 and is fixedly connected to the lower pressure block 405. The reflux unit 15 includes a second pressure sensor 1501 and a solenoid valve 1502. The inner top wall of the cylinder 4031 is fixedly connected to the solenoid valve 1502. The top of the solenoid valve 1502 is connected to the reflux pipe 14. The second pressure sensor 1501 is provided on one side of the solenoid valve 1502. A support ring 16 is fixedly connected to the inner top wall of the cylinder body 4031 , and the bottom of the support ring 16 is lower than the bottoms of the solenoid valve 1502 and the second pressure sensor 1501 .

[0043] In this embodiment, the observation Figure 5 It can be found that the hydraulic cylinder 1 403 is mainly composed of a cylinder body 4031, a piston 4032 and a connecting rod 4033. When the hydraulic oil enters the cylinder body 4031 through the connecting pipe 2 9, it squeezes the piston 4032 to move downward, causing the connecting rod 4033 to extend out of the cylinder body 4031, which is used to push the downward pressure block 405 to move downward, thereby realizing the action of pressing down the highway bridge.

[0044] When the hydraulic pressure in the hydraulic cylinder 403 increases due to the uphill process, the pressure sensor 1501 installed on the top of the cylinder body 4031 will feedback the pressure, causing the solenoid valve 1502 to open, thereby allowing the hydraulic oil to enter the return pipe 14, thereby achieving pressure relief in the hydraulic cylinder 403, which can effectively ensure that the pressure exerted on the highway bridge by the heavy load-bearing capacity detection of the bridge remains stable.

[0045] However, due to the presence of the electromagnetic valve 1502 and the pressure sensor 1501, the piston 4032 will collide with the pressure sensor 1501 or the electromagnetic valve 1502 when it moves upward, causing the pressure sensor 1501 or the electromagnetic valve 1502 to be crushed, affecting the operation of the reflux unit 15. Figure 7 It can be found that a support ring 16 is fixedly connected to the inner top wall of the cylinder body 4031, and the bottom of the support ring 16 is lower than the bottom of the solenoid valve 1502 and the pressure sensor 1501. At this time, the piston 4032 will collide with the support ring 16 when it moves upward. The support ring 16 provides protection for the solenoid valve 1502 and the pressure sensor 1501, which can effectively ensure the operating stability of the reflux unit 15.

[0046] In a further preferred embodiment of the present invention, Figure 6 As shown, an extrusion groove 17 is provided on the inner wall of the pressure cylinder 13 , and the extrusion groove 17 is arranged above the output port of the reflux pipe 14 . A baffle 18 is slidably connected in the extrusion groove 17 , and a spring 19 is fixedly connected between the top of the baffle 18 and the extrusion groove 17 .

[0047] In this embodiment, since the pressure cylinder 13 absorbs the hydraulic oil in the hydraulic cylinder 2 11 after the overload protection of the hydraulic cylinder 2 11 is triggered, and the hydraulic cylinder 2 11 needs to be reset after the pressure on the hydraulic cylinder 2 11 is reduced, the observation Figure 6 It can be found that an extrusion groove 17 is opened on the inner wall of the pressure cylinder 13, a baffle 18 is slidably connected in the extrusion groove 17, and a spring 19 is fixedly connected between the top of the baffle 18 and the extrusion groove 17. At this time, when the pressure applied to the hydraulic cylinder 2 11 is greater than the supporting force of the spring 19, the spring 19 will be compressed and deformed, causing the baffle 18 to move upward, thereby increasing the space in the pressure cylinder 13, and allowing the hydraulic oil in the hydraulic cylinder 2 11 to flow into the pressure cylinder 13, thereby protecting the hydraulic cylinder 2 11.

[0048] By setting the extrusion groove 17 above the output port of the return pipe 14, the hydraulic oil returning from the return pipe 14 will enter the bottom of the baffle 18, increasing the hydraulic pressure under the baffle 18, thereby squeezing the spring 19 to deform and move the baffle 18 upward. The deformation of the spring 19 is used to apply greater pressure to the block 12 of the hydraulic cylinder 2 11, thereby increasing the pressure of the hydraulic oil injected into the hydraulic cylinder 1 403 by the high-pressure oil tank 401 next time, thereby improving the intensity of the next load-bearing capacity test of the highway bridge.

[0049] In a further preferred embodiment of the present invention, Figure 4 As shown, a crawler 20 is rotatably provided at the bottom of the lower pressing block 405 , and at least two rotating rollers 21 are spaced apart inside the crawler 20 .

[0050] In this embodiment, since the downward pressure block 405 needs to slide on the highway bridge during the process of simulating the vehicle exerting pressure on the highway bridge, the downward pressure block 405 will be subjected to friction during the sliding process, thereby causing the output shaft of the hydraulic cylinder 403 to be subjected to lateral shear force, which will affect the service life of the hydraulic cylinder 403.

[0051] So observe Figure 4 It can be found that by rotatably connecting the track 20 at the bottom of the lower pressure block 405, at least two rotating rollers 21 are arranged at intervals inside the track 20, which can provide protection for the hydraulic cylinder 403 while minimizing the impact on the contact area between the lower pressure block 405 and the highway bridge, and effectively reduce the maintenance frequency of the highway bridge bearing capacity detection device.

[0052] In a further preferred embodiment of the present invention, Figure 8 As shown, a placement slot 22 is provided on the top of the fixture 202 , and a pressure plate 23 for pressing the highway bridge sample is slidably connected above the placement slot 22 .

[0053] In this embodiment, a placement slot 22 is provided on the top of the clamp 202 to place the highway bridge sample, and then the highway bridge sample is clamped under the pressure of the hydraulic press 201. Figure 8 It can also be seen that a pressure plate 23 is slidingly provided above the placement groove 22, which can be used to control the distance between the pressure plate 23 and the placement groove 22, and is used to clamp the highway bridge sample, which can further improve the stability of the highway bridge sample fixation.

[0054] The sliding mode of the pressing plate 23 can be that the pressing plate 23 moves along the axis of the screw when the vertical screw rotates, or it can be driven by a hydraulic press or the like, which will not be elaborated here.

[0055] In a further preferred embodiment of the present invention, Figure 4 As shown, the linear drive unit 3 also includes a motor 304 and a screw rod 305. The motor 304 is fixedly connected to one side of the mounting frame 301, and the output shaft of the motor 304 is fixedly connected to the screw rod 305. The screw rod 305 is arranged between the two guide rails 302 and is threadedly connected to the slide 303.

[0056] In this embodiment, a motor 304 is fixedly connected to one side of the mounting frame 301, and a screw rod 305 is fixedly connected to the output shaft of the motor 304. The screw rod 305 is arranged between the two guide rails 302 and is threadedly connected to the slide 303. The motor 304 can be used to control the screw rod 305 to rotate at a uniform speed, so that the slide 303 can move at a uniform speed on the highway bridge sample with the detection component 4, which can avoid large speed changes that affect the detection accuracy and improve the detection effect of the bearing capacity of the highway bridge.

[0057] In a further preferred embodiment of the present invention, Figure 4 As shown, a plurality of support columns 24 are connected to the top of the hydraulic cylinder 403 at intervals, the top ends of the support columns 24 are in contact with the slide 303 , and the support columns 24 are away from the return pipe 14 .

[0058] In this embodiment, since the force is bidirectional, when the hydraulic cylinder 403 squeezes the highway bridge, the hydraulic cylinder 403 will also be supported by the highway bridge, so the observation Figure 4 It can be found that a plurality of support columns 24 are connected to the top of the hydraulic cylinder 403 at intervals, and the top of the support column 24 is in contact with the slide 303. The support column 24 can be used to provide support for the hydraulic cylinder 403 so that the hydraulic cylinder 403 can stably apply pressure to the highway bridge.

[0059] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the bearing capacity of a highway bridge, characterized in that: It comprises a shell (1), a working chamber (5) is formed on one side of the shell (1), and a protective door (6) is hingedly connected to the opening of the working chamber (5); A clamping mechanism (2) comprising a hydraulic press (201) and a clamp (202), wherein two hydraulic presses (201) are provided and are mounted on the left and right sides of the housing (1), respectively, and an output shaft of the hydraulic press (201) extends into the working chamber (5), and a clamp (202) for fixing the highway bridge sample is fixedly connected to the end of the output shaft; A linear drive unit (3) includes a mounting frame (301), a guide rail (302), and a slide (303), wherein the mounting frame (301) is fixedly connected to the top of the working chamber (5), a slide groove (7) is provided at the bottom of the mounting frame (301), the guide rail (302) is fixedly connected to the front and rear sides of the slide groove (7), and the slide (303) is slidably connected to the bottom of the guide rail (302); The detection component (4) is mainly composed of a high-pressure oil tank (401), an intermediate cylinder (402), a hydraulic cylinder (403), a pressure sensor (404) and a lower pressing block (405). The high-pressure oil tank (401) is fixedly connected to the bottom of the slide (303). The front and rear sides of the high-pressure oil tank (401) are connected to the intermediate cylinder (402) through a connecting pipe (8). The side of the intermediate cylinder (402) away from the high-pressure oil tank (401) is connected to the hydraulic cylinder (403) through a connecting pipe (9). The high-pressure oil tank (401) inputs hydraulic oil into the hydraulic cylinder (403) through the intermediate cylinder (402). The output shaft of the hydraulic cylinder (403) is fixedly connected to the lower pressing block (405) for squeezing the highway bridge sample, and a pressure sensor (404) is provided at the connection. The inner wall of the intermediate cylinder (402) is fixedly connected to a support mesh plate (10) on a side close to the connecting pipe 2 (9), and the support mesh plate (10) is fixedly connected to a hydraulic cylinder 2 (11) on a side away from the connecting pipe 2 (9). The output shaft of the hydraulic cylinder 2 (11) is fixedly connected to a block (12) for blocking the connecting pipe 1 (8). The top of the hydraulic cylinder 2 (11) is fixedly connected to a pressure cylinder (13), and the pressure cylinder (13) is communicated with the oil filling hole of the hydraulic cylinder 2 (11). The top of the pressure cylinder (13) extends out of the intermediate cylinder (402). The outer wall of the pressure cylinder (13) is located above the intermediate cylinder (402) and is fixedly connected to a return pipe (14). The end of the return pipe (14) away from the pressure cylinder (13) is connected to the hydraulic cylinder 1 (403) through the return unit (15).

2. A highway bridge load-bearing capacity detection device according to claim 1, characterized in that: The hydraulic cylinder 1 (403) includes a cylinder body (4031), a piston (4032) and a connecting rod (4033). The top of the outer wall of the cylinder body (4031) is connected to the connecting pipe 2 (9). The piston (4032) is slidably connected inside the cylinder body (4031). The bottom of the piston (4032) is fixedly connected to the connecting rod (4033). The end of the connecting rod (4033) away from the piston (4032) extends out of the cylinder body (4031) and is fixedly connected to the lower pressure block (405).

3. A highway bridge load-bearing capacity detection device according to claim 2, characterized in that: The reflux unit (15) includes a second pressure sensor (1501) and a solenoid valve (1502). The inner top wall of the cylinder body (4031) is fixedly connected to the solenoid valve (1502). The top of the solenoid valve (1502) is connected to the reflux pipe (14). The second pressure sensor (1501) is provided on one side of the solenoid valve (1502).

4. A highway bridge load-bearing capacity detection device according to claim 3, characterized in that: A support ring (16) is fixedly connected to the inner top wall of the cylinder body (4031), and the bottom of the support ring (16) is lower than the bottom of the solenoid valve (1502) and the second pressure sensor (1501).

5. A highway bridge load-bearing capacity detection device according to claim 4, characterized in that: An extrusion groove (17) is formed on the inner wall of the pressure cylinder (13). The extrusion groove (17) is arranged above the output port of the return pipe (14). A baffle (18) is slidably connected in the extrusion groove (17). A spring (19) is fixedly connected between the top of the baffle (18) and the extrusion groove (17).

6. A highway bridge load-bearing capacity detection device according to claim 5, characterized in that: A crawler (20) is rotatably provided at the bottom of the lower pressing block (405), and at least two rotating rollers (21) are spaced apart inside the crawler (20).

7. A highway bridge load-bearing capacity detection device according to claim 6, characterized in that: A placement groove (22) is provided on the top of the clamp (202), and a pressing plate (23) for pressing the highway bridge sample is slidably connected above the placement groove (22).

8. A highway bridge load-bearing capacity detection device according to claim 7, characterized in that: The linear drive unit (3) further comprises a motor (304) and a screw (305); one side of the mounting frame (301) is fixedly connected to the motor (304); an output shaft of the motor (304) is fixedly connected to the screw (305); the screw (305) is arranged between the two guide rails (302) and is threadedly connected to the slide (303).

9. A highway bridge load-bearing capacity detection device according to claim 8, characterized in that: The top of the hydraulic cylinder (403) is connected to a plurality of support columns (24) at intervals, the top ends of the support columns (24) are in contact with the slide (303), and the support columns (24) are kept away from the return pipe (14).

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