Road strength testing device

Abstract

The present invention discloses a road strength testing device, which belongs to the field of road testing technology. The device comprises a base and a sample to be tested. Two mounting seats are symmetrically arranged on the base. The opposite ends of the mounting seats are rotatably connected with support shafts horizontally facing the corresponding ends of the sample. The ends of the support shafts are provided with clamping assemblies for clamping the ends of the sample. The mounting seats are provided with power assemblies for driving the corresponding support shafts to rotate. The base is also provided with a bracket. The top end of the bracket is vertically provided with a hydraulic cylinder facing the sample. The output end of the hydraulic cylinder is provided with a clamping assembly. Pressure sensors are provided on the clamping assembly and the clamping assembly. The purpose is to solve the composite test of the torsional strength and compressive strength of road concrete.

Description

Technical Field

[0001] The invention belongs to the technical field of road testing, and in particular relates to a road strength testing device. Background Art

[0002] With the development of the transportation industry, road construction is also rapidly increasing. In road construction, concrete has become one of the main building materials. Concrete strength is one of the factors affecting road strength, so its test results will directly affect the safety and durability of the road structure. Its test items are generally compressive strength, flexural strength, and tensile strength. However, when the road involves special structures (such as spiral ramps and cantilevered sidewalks) or has eccentric loads (such as heavy vehicles turning sharply), it is necessary to consider the road's torsional strength, compressive strength and other complex tests. Summary of the Invention

[0003] In view of this, the present invention discloses a road strength testing device, which aims to solve the composite test of torsional strength and compressive strength of road concrete.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A road strength testing device includes a base and a sample to be tested, wherein two mounting seats are symmetrically arranged on the base, and the opposite ends of the mounting seats are rotatably connected to support shafts horizontally facing the corresponding ends of the sample, and the ends of the support shafts are provided with clamping assemblies for clamping the ends of the sample, and the mounting seats are provided with power assemblies for driving the corresponding support shafts to rotate; the base is also provided with a bracket, and the top end of the bracket is vertically provided with a hydraulic cylinder facing the sample, and the output end of the hydraulic cylinder is provided with a clamping assembly, and the clamping assembly and the clamping assembly are both provided with pressure sensors.

[0006] In this solution, the power assembly drives the clamping assembly to rotate via a support shaft, applying rotational forces in different directions to both ends of the sample. Simultaneously, a hydraulic cylinder drives the clamping assembly to apply pressure to the center of the sample, simulating the torsional and compressive forces experienced by the road. When only the hydraulic cylinder drives the clamping assembly to apply pressure to the center of the sample, the road's compressive strength can be tested; when only the power assembly applies a rotational force to the sample, the road's torsional strength can be tested. This solution can be adjusted to meet various road strength testing scenarios, providing a more comprehensive approach to testing road strength.

[0007] Furthermore, the clamping assembly includes several clamping plates and a support fixed to the output end of the hydraulic cylinder, a spherical cavity is provided at the lower end of the support, a mounting ball is rotatably provided in the spherical cavity, and a support rod parallel to the sample is horizontally fixed at the bottom of the mounting ball; two position-adjustable clamping plates are symmetrically provided on the lower end surface of the clamping plate, and an annular block is provided at the upper end of each clamping plate, the width of each annular block is smaller than the width of the clamping plate, and a rotating ring is coaxially connected to the annular block, and the rotating rings are coaxially slidably sleeved on the support rod, and a limit pin is detachably connected between the rotating ring and the support rod.

[0008] In this solution, according to the force area required for the sample test, the sliding rotating block will install or remove the clamping plate, and make the adjacent clamping plates contact, and then install the limit pin to prevent the rotating ring from detaching; before the test begins, adjust the clamping plates at both ends of the clamping plate to position the sample and ensure that the clamping plates are close to the sample and the support rods are parallel to the sample. The hydraulic cylinder transmits the force to the clamping plate through the support and other structures, and then applies force to the sample through the clamping plate. When the compressive strength and torsional strength of the sample are tested at the same time, the torsional force on both ends of the sample causes the middle part of the sample to gradually undergo torsional deformation. At this time, the deflection of the mounting ball is used to make the clamping plate fit the sample as closely as possible in the horizontal direction of the sample, and the rotation of the annular block relative to the rotating ring makes the clamping plate fit the sample as closely as possible in the longitudinal direction of the sample, thereby reducing the change in the longitudinal pressure area of ​​the sample during the test and ensuring the stability of the pressure applied to the sample.

[0009] Furthermore, the lower end surfaces of the pressure plates are provided with slide grooves with an inverted U-shaped longitudinal section, and a slide seat is horizontally slidably connected in the slide grooves, and the clamping plates are slidably connected to the corresponding slide seat ends, and the clamping plate ends extend downward from the notches of the slide grooves. Adjustment rods are threadedly connected between adjacent clamping plates, and the threads at both ends of the adjustment rods are rotated in opposite directions; a cylinder is fixed at both ends of the slide groove, and a support rod is coaxially slidably provided inside the cylinder, one end of the support rod is connected to the slide seat end, and the other end of the support rod is fixed with a hydraulic plate slidably connected to the cylinder; the inside of the pressure plate A pipeline is provided, and a hose whose end is connected to the interior of the corresponding cylinder is provided in the pipeline. Damping fluid is provided in the hose and between the hydraulic plate and the bottom of the cylinder; an annular groove is coaxially provided on the outer wall of the rotating ring, and a plurality of limit grooves parallel to the support rod are provided on one side of the annular groove; a mounting groove connected to the side wall of the pipeline is provided in the clamping plate, and a limit block for clamping the hose is slidably connected in the mounting groove, and an elastic support piece is detachably connected between the limit block and the mounting groove, and the top of the limit block passes through the annular block upward and extends into the corresponding limit groove.

[0010] In this solution, by simultaneously rotating all adjustment rods, the clamping plates at both ends move toward each other until they are in contact with the sample, completing initial positioning. Initially, the stopper, under the action of the elastic support, compresses the hose, preventing the damping fluid from flowing. At this point, the stopper is located within the corresponding stopper groove, preventing the annular block from rotating relative to the bracket, thus preventing an unbalanced force applied to the sample by both ends of the clamping plate. When the sample deforms due to torsion, the sample's sidewall drives the slide to one side via the clamping plate. The slide, through the corresponding support rod, squeezes the damping fluid within the corresponding cylinder. When the pressure on one side of the hose increases to a certain level, the damping fluid expands the hose, pushing the stopper from the stopper groove into the annular groove. The annular block can now rotate a certain angle relative to the rotating ring, keeping the clamping plate as close to the sample surface as possible. When the pressure in the hose is balanced, the stopper, under the action of the elastic support, slides from the stopper groove into the annular groove, restricting the annular block's rotation relative to the rotating ring and re-squeezing the hose to cut off the flow of the damping fluid. Through the above operation, the force exerted by the side wall of the sample on the clamping plate when the sample is torsionally deformed is released step by step, which can effectively reduce the vibration of the sample during deformation, affect the change in the direction of the pressure on the sample, and affect the stability of the test data; at the same time, the rotation of the clamping plate and the annular block relative to the rotating ring occurs successively, and each rotation indicates that the degree of formation of the sample is intensified, and the deformation of the sample is divided into various stages. Compared with the change in the contact area between the clamping plate and the sample during the entire deformation process, the change in the contact area between the clamping plate and the sample in each deformation stage is more obvious, and thus the change in the pressure data of the sample at each deformation stage is more accurately represented; in addition, by replacing the elastic support members with different elastic forces, the gradual release period can be adjusted according to the test needs.

[0011] Furthermore, the clamping assembly includes a rotating seat fixed to the end of the supporting shaft, and two telescopic cylinders with opposite output ends are horizontally arranged on the end surface of the rotating seat facing the sample, and the output ends of the telescopic cylinders are each provided with a positioning plate; vertically arranged clamping grooves are opened on the end surfaces of the rotating seat, and a driving screw is coaxially connected to the clamping groove, and both ends of the driving screw are threadedly connected to a seat body that is slidably connected to the clamping groove, and the threads at both ends of the driving screw have opposite rotation directions, and the seat body can be detachably connected with a number of clamping plates extending out of the clamping groove.

[0012] Furthermore, the end of the limit block that contacts the hose is arc-shaped.

[0013] Furthermore, reinforcing ribs are provided between the annular block and the pressing plate.

[0014] Furthermore, a plurality of guide grooves are provided on the circumference of the support rod, and guide blocks cooperating with the guide grooves are provided on the inner wall of the rotating ring.

[0015] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention provides the following drawings for illustration:

[0017] Figure 1 Schematic diagram of the structure of an embodiment of the present invention;

[0018] Figure 2 for Figure 1 A magnified schematic diagram of point A in the middle;

[0019] Figure 3 for Figure 2 A magnified schematic diagram of point B in the middle;

[0020] Figure 4 A longitudinal sectional view of a pressing plate in an embodiment of the present invention;

[0021] Figure 5 Schematic diagram of the structure of the clamping assembly in an embodiment of the present invention.

[0022] The markings in the accompanying drawings are as follows: base 1, sample 2, mounting seat 3, support shaft 4, bracket 5, hydraulic cylinder 6, support 7, mounting ball 8, annular block 9, pressure plate 10, support rod 11, clamping plate 12, rotating ring 13, limit pin 14, adjusting rod 15, slide 16, cylinder 17, support rod 18, hydraulic plate 19, pipeline 20, annular groove 21, limit groove 22, mounting groove 23, limit block 24, rotating seat 25, telescopic cylinder 26, positioning plate 27, seat body 28, clamping plate 29, guide groove 30, guide block 31, reinforcement rib 32, drive screw 33. DETAILED DESCRIPTION

[0023] like Figures 1 to 5 As shown:

[0024] A road strength testing device comprises a base 1 and a sample 2 to be tested, wherein two mounting seats 3 are symmetrically arranged on the base 1, and the opposite ends of the mounting seats 3 are rotatably connected with support shafts 4 horizontally facing the corresponding ends of the sample 2, and the ends of the support shafts 4 are provided with clamping assemblies for clamping the ends of the sample 2, and the mounting seats 3 are provided with power assemblies for driving the corresponding support shafts 4 to rotate (the power assemblies in this embodiment are driven by a motor, which is a conventional technical means, so they are not drawn in the figure); a bracket 5 is also provided on the base 1, and a hydraulic cylinder 6 facing the sample 2 is vertically arranged at the top of the bracket 5, and a clamping assembly is provided at the output end of the hydraulic cylinder 6, and pressure sensors are provided on the clamping assembly and the clamping assembly (which is a conventional technical means, so they are not drawn in the figure).

[0025] In this solution, the power assembly drives the clamping assembly to rotate via support shaft 4, thereby applying rotational forces in different directions to both ends of sample 2. Simultaneously, the hydraulic cylinder 6 drives the clamping assembly to apply pressure to the center of sample 2, thereby simulating a road subjected to both torsional and compressive forces. When only the hydraulic cylinder 6 drives the clamping assembly to apply pressure to the center of sample 2, the road's compressive strength can be tested; when only the power assembly applies a rotational force to sample 2, the road's torsional strength can be tested. This solution can be adjusted to meet various road strength testing scenarios, thereby providing a more comprehensive test of road strength.

[0026] In this embodiment, the clamping assembly includes several clamping plates 10 and a support 7 fixed to the output end of the hydraulic cylinder 6. The pressure sensor corresponding to the clamping assembly is arranged on the lower end surface of the corresponding clamping plate 10. The lower end of the support 7 is provided with a spherical cavity, and a mounting ball 8 is rotatably arranged in the spherical cavity. The bottom of the mounting ball 8 is horizontally fixed with a support rod 11 parallel to the sample 2; two position-adjustable clamping plates 12 are symmetrically provided on the lower end surface of the clamping plate 10, and an annular block 9 is provided on the upper end of the clamping plate 10. The width of the annular block 9 is smaller than the width of the clamping plate 10. A rotating ring 13 is coaxially rotatably connected in the annular block 9, and the rotating ring 13 is coaxially slidably sleeved on the support rod 11. The rotating ring 13 and the support rod 11 are detachably connected with a limiting pin 14.

[0027] In this solution, depending on the required force area of ​​sample 2, a sliding rotating block installs or removes the compression plate 10, placing adjacent compression plates 10 in contact. Stop pins 14 are then installed to prevent the rotating ring 13 from disengaging. Before testing begins, the clamping plates 12 at both ends of the compression plate 10 are adjusted to position the sample 2, ensuring that the compression plates 10 are in close contact with the sample 2 and that the support rods 11 are parallel to the sample 2. The hydraulic cylinder 6 transmits its force to the compression plate 10 through structures such as the support 7, which in turn applies force to the sample 2 through the compression plate 10. When the compressive strength and torsional strength of sample 2 are tested at the same time, the torsional force exerted on both ends of sample 2 causes the middle part of sample 2 to gradually undergo torsional deformation. At this time, the deflection of the mounting ball 8 allows the clamping plate 10 to fit the sample 2 as closely as possible in the transverse direction of the sample 2, and the rotation of the annular block 9 relative to the rotating ring 13 allows the clamping plate 10 to fit the sample 2 as closely as possible in the longitudinal direction of the sample 2, thereby reducing the change in the longitudinal pressure area of ​​the sample 2 during the test and ensuring the stability of the pressure applied to the sample 2.

[0028] In this embodiment, the lower end surface of the pressure plate 10 is provided with a slide groove with an inverted U-shaped longitudinal section, and a slide seat 16 is horizontally slidably connected in the slide groove. The clamping plates 12 are slidably connected to the ends of the corresponding slide seats 16, and the ends of the clamping plates 12 extend downward from the notches of the slide grooves. Adjustment rods 15 are threadedly connected between adjacent clamping plates 12, and the threads at both ends of the adjustment rods 15 are rotated in opposite directions; a cylinder 17 is fixed at both ends of the slide groove, and a support rod 18 is coaxially slidably provided inside the cylinder 17, one end of the support rod 18 is connected to the end of the slide seat 16, and the other end of the support rod 18 is fixed with a hydraulic plate 19 slidably connected to the cylinder 17; a pipeline 20 is provided inside the pressure plate 10, and the A hose whose end is connected to the interior of the corresponding cylinder 17 is provided in the pipeline 20, and damping fluid is provided in the hose and between the hydraulic plate 19 and the bottom of the cylinder 17; an annular groove 21 is coaxially provided on the outer wall of the rotating ring 13, and a plurality of limit grooves 22 parallel to the support rod 11 are provided on one side of the annular groove 21; a mounting groove 23 connected to the side wall of the pipeline 20 is provided in the clamping plate 10, and a limit block 24 for clamping the hose is slidably connected in the mounting groove 23, and an elastic support member (which is a conventional technical means and is not drawn in the figure) is detachably connected between the limit block 24 and the mounting groove 23, and the top of the limit block 24 passes through the annular block 9 upward and extends into the corresponding limit groove 22.

[0029] In this solution, by rotating all the adjustment rods 15 at the same time, the clamping plates 12 at both ends are moved toward each other to fit with the sample 2, completing the preliminary positioning; in the initial state, the limit block 24 presses the hose under the action of the elastic support member to prevent the damping fluid from flowing. At this time, the limit block 24 is located in the corresponding limit groove 22, so that the annular block 9 cannot rotate relative to the bracket 5, preventing the two ends of the clamping plate 10 from applying an unbalanced force to the sample 2. When the sample 2 is deformed due to torsion, the side wall of the sample 2 drives the slide 16 to slide to one side through the clamping plate 12, and the slide 16 squeezes the damping liquid in the corresponding cylinder 17 through the corresponding support rod 18. When the pressure in one side of the hose increases to a certain level, the damping liquid causes the hose to expand, and then pushes the limit block 24 from the limit groove 22 into the annular groove 21. At this time, the annular block 9 can rotate a certain angle relative to the rotating ring 13, so that the clamping plate 10 is as close to the surface of the sample 2 as possible; when the pressure in the hose is balanced, the limit block 24 slides from the limit groove 22 into the annular groove 21 under the action of the elastic support, restricts the rotation of the annular block 9 relative to the rotating ring 13, and re-squeezes the hose to cut off the flow of the damping liquid. Through the above operation, the force exerted by the side wall of sample 2 on the clamping plate 12 when sample 2 is torsionally deformed is released step by step, which can effectively reduce the vibration of sample 2 during deformation, affect the change in the direction of the pressure on sample 2, and affect the stability of the test data; at the same time, the rotation of the clamping plate 10 and the annular block 9 relative to the rotating ring 13 occurs successively, and each rotation indicates that the degree of formation of sample 2 is intensified, and the deformation of sample 2 is divided into various stages. Compared with the change in the contact area between the clamping plate 10 and sample 2 during the entire deformation process, the change in the contact area between the clamping plate 10 and sample 2 in each deformation stage is more obvious, and then the change in the pressure data of sample 2 at each deformation stage is more accurately represented, making the test data more detailed; in addition, by replacing the elastic support members with different elastic forces, the gradual release period can be adjusted according to the test needs.

[0030] In this embodiment, the clamping assembly includes a rotating seat 25 fixed to the end of the support shaft 4, and two telescopic cylinders 26 with opposite output ends are horizontally arranged on the end face of the rotating seat 25 facing the sample 2, and the output ends of the telescopic cylinders 26 are each provided with a positioning plate 27; the end face of the rotating seat 25 is provided with a vertically arranged clamping groove, and a driving screw 33 is coaxially connected to the clamping groove, and both ends of the driving screw 33 are threadedly connected to a seat body 28 that is slidably connected to the clamping groove, and the threads at both ends of the driving screw 33 have opposite rotation directions, and the seat body 28 can be detachably connected with a number of clamping plates 29 extending out of the clamping groove, and the pressure sensor corresponding to the clamping assembly is arranged on the corresponding clamping plate 29.

[0031] When installing sample 2, a corresponding number of clamping plates 29 are installed according to the requirements of the torsion resistance test of sample 2 to adjust the torsional force area of ​​sample 2; by rotating the driving screw 33, the seat bodies 28 at both ends drive the corresponding clamping plates 29 to move to fit with sample 2 to complete the initial positioning; the positioning plates 27 are driven by the telescopic cylinder 26 to limit the two sides of sample 2 to prevent sample 2 from sliding and causing test errors.

[0032] In this embodiment, the end of the limit block 24 that contacts the hose is arc-shaped.

[0033] In this solution, the contact end of the limit block 24 and the hose is set to be arc-shaped, so as to reduce the wear of the limit block 24 on the hose.

[0034] In this embodiment, reinforcing ribs 32 are provided between the annular block 9 and the pressing plate 10 .

[0035] In this solution, the connection strength between the annular block 9 and the pressing plate 10 is increased by providing the reinforcing ribs 32 .

[0036] In this embodiment, a plurality of guide grooves 30 are formed on the circumference of the support rod 11 , and guide blocks 31 cooperating with the guide grooves 30 are provided on the inner wall of the rotating ring 13 .

[0037] In this solution, the guide groove 30 and the guide block 31 are provided to prevent the rotating ring 13 from rotating relative to the support rod 11 during the test, thereby preventing the accuracy of the test data from being affected.

[0038] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A road strength testing device, characterized in that: The tester comprises a base and a sample to be tested, wherein two mounting seats are symmetrically arranged on the base, and the opposing ends of the mounting seats are rotatably connected with support shafts horizontally facing the corresponding ends of the sample, and the ends of the support shafts are provided with clamping assemblies for clamping the ends of the sample, and the mounting seats are provided with power assemblies for driving the corresponding support shafts to rotate; the base is also provided with a bracket, and a hydraulic cylinder facing the sample is vertically arranged on the top of the bracket, and a pressing assembly is provided at the output end of the hydraulic cylinder, and pressure sensors are provided on the pressing assembly and the clamping assembly; the pressure sensor The tightening assembly includes several clamping plates and a support fixed to the output end of the hydraulic cylinder, a spherical cavity is provided at the lower end of the support, a mounting ball is rotatably provided in the spherical cavity, and a support rod parallel to the sample is horizontally fixed to the bottom of the mounting ball; two position-adjustable clamping plates are symmetrically provided on the lower end surface of the clamping plate, and an annular block is provided at the upper end of each clamping plate, the width of each annular block is smaller than the width of the clamping plate, a rotating ring is coaxially connected to the annular block, and the rotating rings are coaxially slidably sleeved on the support rod, and a limit pin is detachably connected between the rotating ring and the support rod.

2. A road strength testing device according to claim 1, characterized in that: The lower end surface of the pressure plate is provided with a slide groove with an inverted U-shaped longitudinal section, and a slide seat is horizontally slidably connected in the slide groove. The clamping plates are slidably connected to the corresponding slide seat ends, and the clamping plate ends extend downward from the notch of the slide groove. Adjustment rods are threadedly connected between adjacent clamping plates, and the threads at both ends of the adjustment rods are rotated in opposite directions; a cylinder is fixed at both ends of the slide groove, and a support rod is coaxially slidably arranged inside the cylinder, one end of the support rod is connected to the slide seat end, and the other end of the support rod is fixed with a hydraulic plate slidably connected to the cylinder; a There is a pipeline, and a hose whose end is connected to the inside of the corresponding cylinder is provided in the pipeline. Damping fluid is provided in the hose and between the hydraulic plate and the bottom of the cylinder; an annular groove is coaxially provided on the outer wall of the rotating ring, and a plurality of limit grooves parallel to the support rod are provided on one side of the annular groove; a mounting groove connected to the side wall of the pipeline is provided in the clamping plate, and a limit block for clamping the hose is slidably connected in the mounting groove, and an elastic support piece is detachably connected between the limit block and the mounting groove, and the top of the limit block passes through the annular block upward and extends into the corresponding limit groove.

3. A road strength testing device according to claim 2, characterized in that: The clamping assembly includes a rotating seat fixed to the end of the supporting shaft, and two telescopic cylinders with output ends facing each other are horizontally arranged on the end surface of the rotating seat facing the sample, and the output ends of the telescopic cylinders are each provided with a positioning plate; vertically arranged clamping grooves are opened on the end surfaces of the rotating seat, and a driving screw is coaxially connected to the clamping groove, and both ends of the driving screw are threadedly connected to a seat body that is slidably connected to the clamping groove, and the threads at both ends of the driving screw have opposite rotation directions, and the seat body can be detachably connected with a number of clamping plates extending out of the clamping groove.

4. A road strength testing device according to claim 3, characterized in that: The end portion of the limiting block that contacts the hose is arc-shaped.

5. A road strength testing device according to claim 4, characterized in that: Reinforcement ribs are provided between the annular block and the pressing plate.

6. A road strength testing device according to claim 5, characterized in that: A plurality of guide grooves are provided on the circumference of the support rod, and guide blocks that match the guide grooves are provided on the inner wall of the rotating ring.

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