Device for measuring deformation of asphalt pavement by applying dynamic load

Abstract

The utility model discloses a device for measuring the deformation of an asphalt pavement by applying a dynamic load, which comprises a mounting plate, two vertical plates arranged at the bottom of the mounting plate, two vertical guide rails arranged on the inner side surfaces of the two vertical plates, two sliding blocks arranged on the two guide rails and capable of sliding relative to the guide rails in a guiding manner, and a horizontal steel beam arranged between the two sliding blocks, the two ends of the steel beam are fixedly connected with the two sliding blocks respectively, a first hydraulic cylinder used for driving the sliding blocks to ascend is arranged below each sliding block, a hoisting rod is arranged at the bottom of the steel beam, the upper end of the hoisting rod is fixedly connected with the middle of the steel beam, and the lower end of the hoisting rod is connected with a hammer head. A vertically-through through hole is formed in the mounting plate, and a steel wire rope on the winch extends downwards to penetrate through the through hole to be fixedly connected with the electromagnetic chuck. The device can continuously apply dynamic load to rapidly measure the deformation of the asphalt pavement, and is high in measurement efficiency, high in measurement result precision and time-saving and labor-saving in the measurement process.

Description

Technical Field

[0001] The utility model relates to the technical field of deformation detection equipment for asphalt pavements, and particularly relates to a device for applying dynamic loads to measure the deformation of asphalt pavements. Background Technique

[0002] The test detection of asphalt concrete pavements is very important work, and the quality of the project will be directly affected by it. To provide accurate and scientific basis for the quality evaluation of highway projects, it must be achieved through strict project supervision, scientific detection and test means. If a project does not have scientific test data, then the true evaluation of the project quality cannot be made, and good acceptance results cannot be obtained. The data obtained from accurate test detection during highway construction can comprehensively control each process of the project and the performance of raw materials, the mix ratio of various mixtures, and the strength of production products, so as to ensure the quality of the project. The detection of the pavement bearing capacity is to obtain the deflection of the pavement. The pavement deflection detection is a main index for measuring the strength of flexible pavements in China. The pavement deflection refers to the total vertical deformation or vertical rebound deformation value generated at the wheel gap position on the pavement surface under the action of the specified standard axle load.

[0003] At present, the dynamic load determination of asphalt concrete pavements is divided into two types. The first type is that an artificial handheld detection device impacts the ground to cause the ground to deform for detection. Although the manufacturing cost of the handheld detection device is low, the detection process of the artificial handheld detection device is time-consuming and laborious, and the dynamic load during the detection process is unstable, resulting in low detection result accuracy and low detection efficiency. The other type is to detect through a falling weight deflectometer. The manufacturing cost of the falling weight deflectometer is high, the replacement of the counterweight is time-consuming and laborious, the electric control system is complex, and the failure rate is high. Content of the Utility Model

[0004] The utility model provides a device for applying dynamic loads to measure the deformation of asphalt pavements, which solves the problems of low detection efficiency, time-consuming and laborious detection process, and low detection accuracy of traditional deformation detection equipment for asphalt concrete pavements.

[0005] The utility model provides a device for applying dynamic loads to measure the deformation of asphalt pavements, including a mounting plate. Two vertical plates are arranged at the bottom of the mounting plate. Two vertical guide rails are arranged on the inner sides of the two vertical plates. Two sliders that can slide relative to the guide rails are arranged on the two guide rails. A horizontal steel beam is arranged between the two sliders. The two ends of the steel beam are respectively fixedly connected to the two sliders. A first hydraulic cylinder for driving the slider to rise is arranged below each slider. A lifting rod is arranged at the bottom of the steel beam. The upper end of the lifting rod is fixedly connected to the middle of the steel beam, and the lower end is connected to a hammer head. An electromagnetic chuck is arranged in the middle above the steel beam. A winch is arranged on the mounting plate. A through hole that penetrates up and down is arranged on the mounting plate. The steel wire rope on the winch extends downward through the through hole and is fixedly connected to the electromagnetic chuck.

[0006] In the above technical solution, further, two guide columns are arranged on the steel beam, a plurality of counterweight plates are arranged on the two guide columns, and two second hydraulic cylinders for supporting and fixing the counterweight plates are arranged on the two vertical plates.

[0007] In the above technical solution, further, the first hydraulic cylinder is vertically fixed on the side of the vertical plate, the telescopic end of the first hydraulic cylinder is arranged upward, and a first support block is arranged at the telescopic end of the first hydraulic cylinder.

[0008] In the above technical solution, further, the second hydraulic cylinder is horizontally fixed on the side of the vertical plate, and a second support block is arranged at the telescopic end of the second hydraulic cylinder.

[0009] In the above technical solution, further, an oil tank is arranged on the vertical plate, a gear pump is arranged on the oil tank, the gear pump is connected to the oil tank through an oil supply pipe, and the gear pump is connected to the first hydraulic cylinder and the second hydraulic cylinder through a flow dividing valve and a branch oil pipe.

[0010] In the above technical solution, further, two vertically arranged adjusting rods are arranged at the bottom of each vertical plate. The upper part of each adjusting rod is inserted into a guiding hole arranged at the bottom of the vertical plate. A connecting plate is arranged at the lower end of the adjusting rod, a traveling wheel is arranged at the bottom of the connecting plate, a threaded hole penetrating the guiding hole is arranged on the side of the vertical plate, and an adjusting screw is arranged in the threaded hole.

[0011] As can be seen from the above technical solutions, the present invention provides a device for measuring the deformation of an asphalt pavement by applying a dynamic load.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] In the present invention, two first hydraulic cylinders drive two sliders to drive the steel beam to rise to the highest position along the guide rail, and then the motor of the winch drives the drum to release the steel wire rope until the electromagnetic chuck contacts the steel beam. The electromagnetic chuck is electrified to generate magnetic force, and the steel beam is strongly magnetically attracted. Then, the telescopic ends of the two first hydraulic cylinders retract to the lowest point, and then the controller controls the electromagnetic chuck to be powered off. The electromagnetic chuck loses power and the electromagnetic attraction disappears. The steel beam drives the lifting rod and the hammer head at the lower end of the lifting rod to move downward under the action of its own gravity. The hammer head impacts the asphalt pavement to cause the asphalt pavement to deform. The applied dynamic load has good stability, high detection efficiency and high detection accuracy. By driving the telescopic end of the second hydraulic cylinder to intercept the idle counterweight blocks, the counterweight plates can be quickly increased or decreased, and the manual labor intensity is saved during the process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for the implementation cases will be briefly introduced below. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative labor.

[0015] Figure 1 The overall structural schematic diagram of a device for measuring the deformation of asphalt pavement by applying dynamic load proposed by the present utility model;

[0016] Figure 2 The partial structural schematic diagram of a device for measuring the deformation of asphalt pavement by applying dynamic load proposed by the present utility model.

[0017] In the figure:

[0018] 1 - mounting plate; 11 - guide hole; 12 - guide post;

[0019] 2 - vertical plate; 20 - guide hole; 21 - guide rail; 22 - slider; 23 - steel beam; 24 - first hydraulic cylinder; 25 - lifting rod; 26 - electromagnetic chuck; 27 - oil tank; 28 - gear pump; 241 - first support block; 281 - flow dividing valve; 282 - flow dividing oil pipe;

[0020] 3 - hammer head;

[0021] 4 - winch; 41 - steel wire rope;

[0022] 5 - counterweight plate; 51 - second hydraulic cylinder; 511 - second support block;

[0023] 6 - adjusting rod; 61 - connecting plate; 62 - traveling wheel; 63 - adjusting screw. Specific implementation manners

[0024] In order to enable those skilled in the art of the present technology to better understand the technical solutions in the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0025] Embodiment 1:

[0026] See Figure 1-2, A device for measuring the deformation of asphalt pavement by applying dynamic load, which includes a horizontally arranged mounting plate 1. At the bottom of the mounting plate 1, two vertically arranged vertical plates 2 are provided. The bottom of the mounting plate 1 is perpendicularly welded and fixedly connected to the two vertical plates 2. On the inner sides of the two vertical plates 2, two vertically arranged guide rails 21 are provided. The guide rails 21 are detachably fixedly connected to the vertical plates 2 by screws. On the two guide rails 21, two sliders 22 that can slide vertically along the guide rails 21 are arranged. A horizontal steel beam 23 is arranged between the two sliders 22. Both ends of the steel beam 23 are fixedly connected to the two sliders 22 respectively. Below each slider 22, a first hydraulic cylinder 24 for driving the slider 22 to rise is provided. At the bottom of the steel beam 23, a lifting rod 25 is provided. The upper end of the lifting rod 25 is fixedly connected to the middle of the steel beam 23, and the lower end is connected to a hammer head 3. The hammer head 3 is used to directly act on the asphalt pavement to cause deformation of the asphalt pavement. In the middle above the steel beam 23, an electromagnetic chuck 26 is provided. The suction cup of the electromagnetic chuck 26 faces downward. When the electromagnetic chuck 26 is powered on, it strongly magnetically attracts the steel beam 23 through strong magnetic force, and releases the steel beam 23 when powered off. On the mounting plate 1, a winch 4 is provided. The winch 4 is a commercially available device on the market, and the drum is driven by a motor to wind the steel wire rope to achieve precise adjustment of the height of the electromagnetic chuck 26. A through hole 11 that penetrates up and down is provided on the mounting plate 1. The steel wire rope 41 on the winch 4 extends downward through the through hole 11 and is fixedly connected to the electromagnetic chuck 26. By driving the two sliders 22 to rise a certain height along the guide rails 21 by the two first hydraulic cylinders 24, the two sliders 22 drive the steel beam 23 to rise to the highest position. Then, the motor of the winch 4 drives the drum to release the steel wire rope until the electromagnetic chuck 26 contacts the steel beam 23. The electromagnetic chuck 26 is powered on to generate magnetic force and strongly magnetically attracts the steel beam 23 through strong magnetic force. Then, the telescopic ends of the two first hydraulic cylinders 24 are retracted to the lowest point. Then, the controller controls the electromagnetic chuck 26 to be powered off. The electromagnetic chuck 26 loses power and the electromagnetic suction force disappears. The steel beam 23 drives the lifting rod 25 and the hammer head 3 at the lower end of the lifting rod 25 to move downward under the action of its own gravity. The hammer head 3 impacts the asphalt pavement to cause deformation of the asphalt pavement. The applied dynamic load has good stability, high detection efficiency, saves labor intensity during the detection process, and has a high degree of automation.

[0027] In this embodiment, refer to Figure 1, two guiding columns 12 are arranged on the steel beam 23, and a plurality of counterweight plates 5 are arranged on the two guiding columns 12. Each counterweight plate 5 is in the shape of a rectangular block, and the weights of the counterweight blocks arranged from bottom to top increase, which is specifically manifested in the increase of the length dimension, that is, the length of each lower counterweight plate 5 is less than that of the upper counterweight plate 5, and the two ends of the upper counterweight plate 5 protrude from the lower counterweight plate 5. A through hole through which the electromagnetic chuck 26 can pass is arranged in the middle of each counterweight plate 5, and two positioning holes are arranged at both ends of each counterweight plate 5. The counterweight plate 5 is sleeved on the two guiding columns 12 through the two positioning holes to prevent the counterweight plate 5 from shifting sideways and increase safety. Two second hydraulic cylinders 51 for supporting and fixing the counterweight plate 5 are arranged on the two vertical plates 2. A horizontal through hole is arranged on each vertical plate 2, and each second hydraulic cylinder 51 is horizontally fixed on the outer side of the vertical plate 2. The telescopic end of the second hydraulic cylinder 51 passes through the horizontal through hole arranged on each vertical plate 2 and extends to the inner side of the vertical plate 2. When it is necessary to increase the number of counterweights on the steel beam 23, the wire rope is wound by the winch 4, and the wire rope drives the electromagnetic chuck 26 to suck the steel beam 23 and move upward, lifting all the counterweight blocks into the air. Then, the telescopic end of the second hydraulic cylinder 51 is driven to retract to directly below the two ends of the idle counterweight plate 5, so that during the process of the height reduction of all the counterweight blocks, only the idle counterweight blocks are intercepted and suspended and supported by the two second hydraulic cylinders 51, realizing the action of quickly increasing or decreasing the counterweight plate 5 to change the dynamic load applied by the steel beam 23.

[0028] In this embodiment, refer to Figure 1 , the first hydraulic cylinder 24 is vertically fixed on the side of the vertical plate 2, the telescopic end of the first hydraulic cylinder 24 is arranged upward, and a first support block 241 is arranged at the telescopic end of the first hydraulic cylinder 24 to prevent damage to the telescopic end of the first hydraulic cylinder 24 through the contact slider 22.

[0029] In this embodiment, refer to Figure 1 , the second hydraulic cylinder 51 is horizontally fixed on the side of the vertical plate 2, and a second support block 511 is arranged at the telescopic end of the second hydraulic cylinder 51 to contact the counterweight plate 5 through the second support block 511 and support it.

[0030] In this embodiment, refer to Figure 1 , an oil tank 27 is arranged on the vertical plate 2, a gear pump 28 is arranged on the oil tank 27, the gear pump 28 is connected to the oil tank 27 through an oil supply pipe, and the gear pump 28 is connected to the first hydraulic cylinder 24 and the second hydraulic cylinder 51 through a flow dividing valve 281 and a flow dividing pipe 282.

[0031] In this embodiment, refer to Figure 2, two vertical adjusting rods 6 are arranged at the bottom of each vertical plate 2. The upper part of each adjusting rod 6 is inserted into the guiding hole 20 arranged at the bottom of the vertical plate 2. A connecting plate 61 is arranged at the lower end of the adjusting rod 6, and a traveling wheel 62 is arranged at the bottom of the connecting plate 61. A threaded hole penetrating the guiding hole 20 is arranged on the side surface of the vertical plate 2, and an adjusting screw 63 is arranged in the threaded hole. By adjusting the adjusting rod 6, it is convenient to adjust the height of the two vertical plates 2 on the ground, preventing the uneven ground from affecting the detection result. Specifically, a spirit level can be placed on the mounting plate 1 to ensure that the hoisting rod 25 moves vertically up and down.

[0032] In the present utility model, the electromagnetic chuck 26 is a commercially available device. The electromagnetic chuck 26 is a device that uses the principle of electromagnetic force to adsorb objects. Its working principle is to generate a strong magnetic field inside the chuck. When the steel beam 23 approaches the chuck, the magnetic field acts on the iron part of the steel beam, generating magnetic force. This magnetic force causes the steel beam to be adsorbed on the chuck. The electromagnetic chuck consists of an electromagnet, a magnet, a steel plate, a power supply, etc. When the power supply is turned on, an electric current passes through the electromagnet to generate a magnetic field, and the magnetic field is transmitted to the surface of the chuck through the steel plate. The surface of the chuck is covered with a magnet to enhance the magnetic field strength. When the steel beam 23 to be adsorbed approaches the chuck, the iron or magnetic part of the steel beam 23 will be affected by the magnetic force, thus generating an adsorption effect. When it is necessary to release the steel beam, just cut off the power supply, the magnetic field will disappear, the chuck loses magnetic force, and the steel beam 23 can be released from the chuck.

[0033] As can be seen from the above technical solutions, during use, two first hydraulic cylinders 24 drive two sliders 22 to rise a certain height along the guide rail 21. The two sliders 22 drive the steel beam 23 to rise to the highest position. Then, the motor of the winch 4 drives the drum to release the steel wire rope until the electromagnetic chuck 26 contacts the steel beam 23. The electromagnetic chuck 26 is powered on to generate magnetic force, and the steel beam 23 is firmly attracted by the strong magnetic force. Then, the telescopic ends of the two first hydraulic cylinders 24 retract to the lowest point. Then, the controller controls the electromagnetic chuck 26 to cut off the power supply. The electromagnetic chuck 26 loses power, and the electromagnetic suction force disappears. The steel beam 23 drives the hoisting rod 25 and the hammer head 3 at the lower end of the hoisting rod 25 to move downward under the action of its own gravity. The hammer head 3 impacts the asphalt pavement, causing the asphalt pavement to deform. When it is necessary to increase the counterweight, two second hydraulic cylinders 51 drive their telescopic ends to intercept the idle counterweight plates 5, and enable the counterweight to be increased to drop onto the steel beam 23 and move downward together with the steel beam 23 to impact the ground. After one detection is completed, two first hydraulic cylinders 24 drive two sliders 22 to rise along the guide rail 21, driving the steel beam 23 and the hammer head 3 to rise to the drop hammer height for the next detection.

[0034] Those skilled in the art will readily conceive of other embodiments of the present utility model after considering the specification and practicing the utility model disclosed herein. The present utility model is intended to cover any variations, uses, or adaptations of the present utility model, which follow the general principles of the present utility model and include well-known common general knowledge or conventional technical means in the technical field not disclosed in the present utility model. The specification and examples are only regarded as exemplary, and the true scope of the present utility model is pointed out by the claims.

[0035] It should be understood that the present utility model is not limited to the exact structures already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The above-described embodiments of the present utility model do not constitute a limitation on the protection scope of the present utility model.

Claims

1. A device for measuring the deformation of an asphalt pavement by applying dynamic loads, characterized in that: It includes a mounting plate (1). Two vertical plates (2) are provided at the bottom of the mounting plate (1). Two vertically arranged guide rails (21) are provided on the inner sides of the two vertical plates (2). Two sliders (22) that can slide relative to the guide rails (21) are provided on the two guide rails (21). A horizontal steel beam (23) is provided between the two sliders (22). The two ends of the steel beam (23) are respectively fixedly connected to the two sliders (22). A first hydraulic cylinder (24) for driving the slider (22) to rise is provided below each slider (22). A hoisting rod (25) is provided at the bottom of the steel beam (23). The upper end of the hoisting rod (25) is fixedly connected to the middle of the steel beam (23), and the lower end is connected to a hammer head (3). An electromagnetic chuck (26) is provided in the middle above the steel beam (23). A winch (4) is provided on the upper surface of the mounting plate (1). A through hole (11) that penetrates up and down is provided on the mounting plate (1). The steel wire rope (41) on the winch (4) extends downward through the through hole (11) and is fixedly connected to the electromagnetic chuck (26).

2. The deformation device for measuring the deformation of an asphalt pavement by applying a dynamic load according to claim 1, wherein Two guide columns (12) are provided on the upper surface of the steel beam (23). A plurality of counterweight plates (5) are provided on the two guide columns (12). Two second hydraulic cylinders (51) for supporting and fixing the counterweight plates (5) are provided on the two vertical plates (2).

3. The deformation device for measuring the deformation of an asphalt pavement by applying a dynamic load according to claim 1, characterized in that, The first hydraulic cylinder (24) is vertically fixed on the side of the vertical plate (2). The telescopic end of the first hydraulic cylinder (24) is arranged upward, and a first support block (241) is provided at the telescopic end of the first hydraulic cylinder (24).

4. A device for measuring the deformation of an asphalt pavement by applying a dynamic load according to claim 2, characterized in that, The second hydraulic cylinder (51) is horizontally fixed on the side of the vertical plate (2). A second support block (511) is provided at the telescopic end of the second hydraulic cylinder (51).

5. A device for measuring the deformation of an asphalt pavement by applying a dynamic load according to claim 3 or 4, characterized in that, An oil tank (27) is provided on the vertical plate (2). A gear pump (28) is provided on the oil tank (27). The gear pump (28) is connected to the oil tank (27) through an oil supply pipe. The gear pump (28) is connected to the first hydraulic cylinder (24) and the second hydraulic cylinder (51) through a flow dividing valve (281) and a flow dividing pipe (282).

6. The deformation device for measuring the deformation of an asphalt pavement by applying a dynamic load according to claim 5, characterized in that, Two vertically arranged adjusting rods (6) are provided at the bottom of each vertical plate (2). The upper part of each adjusting rod (6) is inserted into a guide hole (20) provided at the bottom of the vertical plate (2). A connecting plate (61) is provided at the lower end of the adjusting rod (6). A traveling wheel (62) is provided at the bottom of the connecting plate (61). A threaded hole penetrating the guide hole (20) is provided on the side of the vertical plate (2), and an adjusting screw (63) is provided in the threaded hole.

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