Compression test device and method for roadbed at road widening junction

Abstract

The invention relates to the technical field of road engineering test devices, and discloses a road broadening junction roadbed compression test device and method.The device comprises a movable box body, supporting mechanisms are arranged on the two sides of the movable box body, rollers are installed in an inner cavity of the movable box body, the number of the rollers is four, and the rollers are distributed in a rectangular array; a pressure transmission rod is arranged at the top of the movable box body; the shrinking mechanism is located in the inner cavity of the movable box body and used for shrinking the rolling wheels; and the adjusting mechanism is located at the top of the contraction mechanism and used for adjusting the position and height of the pressure transmission rod, and the adjusting mechanism comprises a moving assembly and a lifting assembly. And through mutual cooperation of a moving assembly and a lifting assembly in the adjusting mechanism, the position and the height of the pressure transmission rod can be accurately adjusted. Therefore, the pressure can be uniformly and accurately transmitted to the surface of the roadbed test piece, so that the accuracy of a test result is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of road engineering test devices, in particular to a road widening junction subgrade compression resistance test device and method. BACKGROUND

[0002] In urban road widening engineering, the compression resistance of the junction between the new and old subgrades directly relates to the service life and driving safety of the road. Due to the differences in material, compaction degree, and settlement characteristics between the new and old subgrades, uneven settlement and cracks are prone to occur at the junction, affecting the overall performance of the road.

[0003] To solve the above problems, the patent document CN222506052U discloses a subgrade compression resistance test hammer that can be stably installed, which includes a base, a hitting table fixedly installed on the middle part of the upper end of the base, and a hitting hammer arranged above the hitting table, a fixing mechanism symmetrically arranged on the left and right sides of the hitting table and used for clamping and fixing the subgrade block on the hitting table, and a protective cover arranged outside the hitting table and fixedly connected with connecting plates on the left and right sides of the protective cover, and the connecting plates are connected with the fixing supports through the clamping grooves. The subgrade compression resistance test hammer that can be stably installed is convenient for clamping and fixing the tested subgrade block, prevents deviation during the test, and improves the safety during the test by arranging the protective cover outside the hitting table to prevent the broken subgrade blocks from splashing outward and scratching the testers.

[0004] However, the above device is prone to poor stability due to complex road conditions during movement, and the shaking and jolting affect the precision of the instruments and equipment in the device. During testing, the rollers cannot be effectively fixed, resulting in insufficient overall stability of the device, interference with the test data, and inaccurate reflection of the subgrade compression resistance. In addition, the above device cannot accurately adjust the position and height of the pressure transmission rod, and cannot adapt to the complex spatial position changes of the junction between the new and old subgrades. The mechanical load is not uniform when transmitted to the surface of the subgrade test piece, and the pressure difference is large at different positions, which seriously affects the accuracy of the test results and cannot meet the high-precision requirements of road widening engineering for subgrade compression resistance tests. SUMMARY

[0005] The present application aims to provide a road widening junction roadbed compression resistance test device and method, which realizes high precision and high efficiency of road widening junction roadbed compression resistance test through integration of a movable box, a dynamic contraction mechanism and a multi-dimensional adjustment mechanism. The movable box is provided with a roller array guaranteeing device to ensure portability, and a supporting mechanism to improve test stability; the contraction mechanism realizes dynamic storage of the rollers to avoid test interference; the adjustment mechanism controls horizontal positioning through a moving assembly and adjusts vertical height through a lifting assembly, so that the pressure transmission rod can accurately adapt to spatial position changes of the new and old roadbed junction area, ensuring accurate application of mechanical load for compression resistance test, thereby effectively improving the accuracy of test results and solving the problem of inaccurate test precision in the background technology.

[0006] To solve the above technical problems, according to the first aspect of the present application, a road widening junction roadbed compression resistance test device is provided, comprising:

[0007] A movable box is provided with a supporting mechanism on both sides, a roller is installed in the inner cavity of the movable box, the roller is provided with four groups and arranged in a rectangular array, and a pressure transmission rod is arranged on the top of the movable box.

[0008] A contraction mechanism is located in the inner cavity of the movable box and used for contraction of the roller.

[0009] An adjustment mechanism is located on the top of the contraction mechanism and used for adjusting the position and height of the pressure transmission rod, the adjustment mechanism comprises a moving assembly and a lifting assembly, the moving assembly is located on the top of the movable box and used for moving the position of the pressure transmission rod, and the lifting assembly is located on the top of the moving assembly and used for adjusting the height of the pressure transmission rod.

[0010] Preferably, the contraction mechanism comprises a contraction motor installed on one side of the movable box, a third bidirectional screw rod is installed on one side of the output shaft of the contraction motor, the contraction motor and the third bidirectional screw rod are connected through a shaft coupling, a moving block is threadedly connected to the outer ring of the third bidirectional screw rod, the moving block is provided with two groups and arranged symmetrically, a variable assembly is arranged on the bottom of the moving block, and a limiting assembly is installed in the inner cavity of the movable box.

[0011] Preferably, the variable assembly comprises a mounting block installed in the inner cavity of the movable box, a first variable plate is hinged to the bottom of the moving block, a second variable plate is hinged in the inner cavity of the mounting block, the first variable plate and the second variable plate are connected through a hinge, and the roller is installed at the bottom of the hinge.

[0012] Through the above technical scheme can be known: after the motor starts, through the coupling drive third bidirectional screw rotation, drive two groups of symmetrical distribution of moving block along the limit rod synchronous reverse movement. When the moving block moves down, through the hinged first variable plate and second variable plate push the hinge down to fold, make the roller to be stored in the moving box cavity; on the contrary, the moving block moves up, the variable assembly expands, the roller extends to the working position. The limit rod ensures the stability of the moving track of the moving block, and avoids deviation.

[0013] Preferably, the limiting assembly comprises a limiting rod installed in the inner cavity of the moving box, the limiting rod is provided with two groups and is symmetrically distributed, and the limiting rod is inserted in the inner cavity of the moving block.

[0014] Preferably, the moving assembly comprises a support plate installed on the top of the moving box, a rotating motor is installed on the back of the moving box, a rotating rod is installed on the top of the output shaft of the rotating motor, a gear is installed on the top of the rotating rod, a sliding plate is arranged on the top of the support plate, a rack is installed on the back of the support plate, the gear and the rack are meshed with each other, an extension rod is installed on one side of the sliding plate, and the extension rod is fixedly connected with the support plate.

[0015] Preferably, the lifting assembly comprises a mounting plate installed on the top of the sliding plate, the mounting plate is provided with two groups and is symmetrically distributed, a servo motor is installed in the inside of the mounting plate located in front, a first bidirectional screw rod is installed on the back of the output shaft of the servo motor, a fixed plate is installed on the top of the sliding plate, the fixed plate is provided with two groups and is symmetrically distributed, a second bidirectional screw rod is installed between the fixed plates, adjusting blocks are installed on the outer rings of the first bidirectional screw rod and the second bidirectional screw rod, the adjusting blocks are provided with multiple groups and are symmetrically distributed, and a linkage assembly is installed on the top of the adjusting blocks.

[0016] Preferably, the linkage assembly comprises rotating wheels installed on the outer rings of the first bidirectional screw rod and the second bidirectional screw rod, the rotating wheels are connected through a belt, a rotating plate is hinged to the top of the adjusting block, a lifting plate is arranged on the top of the rotating plate, a sliding groove is formed in the bottom of the lifting plate, a sliding block is installed on the top of the rotating plate and slides in the sliding groove, a circular groove is formed in the inside of the sliding plate, and the pressure transmission rod is sleeved in the inside of the lifting plate.

[0017] Preferably, a placing groove is formed in the top of the moving box, a pressure distribution plate is slidably connected in the inside of the placing groove, the pressure distribution plate is connected with the bottom of the pressure transmission rod, a lever is hinged to one side of the lifting plate, a weight tray is installed on one side of the lever, a weight body is installed on the top of the weight tray, and the lever and the pressure transmission rod are connected through a high-carbon steel force transmission ball.

[0018] The weight body is placed on the weight tray, the load is amplified by a lever force arm ratio of 1:10, is transmitted to the pressure transmission rod through the high-carbon steel force transmission ball, the pressure transmission rod disperses the concentrated load to the pressure distribution plate, and the pressure distribution plate uniformly acts on the surface of the roadbed test piece to simulate the actual road load. The rotating lifting screw can finely adjust the height of the supporting bottom plate, the four groups of rectangular array distributed connecting plates cooperatively ensure that the moving box is kept horizontal during the test, and the measurement error caused by the uneven foundation is eliminated.

[0019] Preferably, one side of the moving box is provided with a connecting plate, the inside of the connecting plate is threadedly connected with a lifting screw, the bottom of the lifting screw is provided with a supporting bottom plate, the connecting plate is provided with four groups and is distributed in a rectangular array, the lifting screw is provided with four groups and is distributed in a rectangular array, and the supporting bottom plate is provided with four groups and is distributed in a rectangular array.

[0020] According to the second aspect of the present application, a road widening junction roadbed compression resistance test method is also provided, which comprises the following steps:

[0021] SS01, turn on the power supply of the test device, start the control system of the retraction motor, rotating motor, servo motor and the like in the moving box, determine the initial position of the roller through the limiting rod installed in the inner cavity of the moving box, ensure that the roller is in the retracted state, set the target position, height, pressure and the like of the pressure transmission rod in the control terminal, and check whether the components such as the lever, weight tray and weight body are in the appropriate position;

[0022] SS02, start the rotating motor to drive the gear to rotate, drive the sliding plate to move transversely along the supporting plate through the meshing with the rack, and move the pressure transmission rod to the set horizontal position. During the movement, the telescopic rod provides auxiliary support and reset force to ensure the stable movement of the pressure transmission rod;

[0023] SS03, according to the road conditions of the test site, start the retraction motor to drive the third bidirectional screw rod to rotate through the shaft coupling, so that the two groups of symmetrically distributed moving blocks move in opposite directions along the limiting rod. When the moving blocks move upwards, the first variable plate and the second variable plate are unfolded, and the roller is extended to the working position to facilitate the movement of the device on the test site. When the moving blocks move downwards, the roller is retracted into the inner cavity of the moving box to ensure the stability during the test;

[0024] SS04, place the weight body on the weight tray, amplify the load through the lever force arm ratio, transmit the load to the pressure transmission rod through the high-carbon steel force transmission ball, start the servo motor to drive the first bidirectional screw rod to rotate, drive the second bidirectional screw rod through the rotating wheel and the belt linkage, and move the adjusting block in the opposite direction synchronously to adjust the height of the pressure transmission rod and realize the application of different pressures to the roadbed test piece;

[0025] SS05. During the test, observe the pressure distribution plate's effect on the roadbed specimen. Adjust the height of the lifting screw to ensure the moving box remains level during roadbed tests with different slopes, eliminating measurement errors caused by uneven ground. Additionally, as needed, the position and height of the pressure transmission rod can be readjusted, and multiple tests can be conducted to obtain accurate compressive strength data.

[0026] SS06. After each test, record the position, height, applied pressure, and deformation of the roadbed specimen. By comparing the results of multiple tests, analyze the compressive strength at the junction of the old and new roadbeds to provide a scientific basis for road widening projects.

[0027] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0028] 1. This invention achieves high precision and efficiency in roadbed compressive strength testing at road widening junctions by integrating a movable housing, a dynamic retraction mechanism, and a multi-dimensional adjustment mechanism. The movable housing is equipped with a roller array to ensure portability, and a support mechanism enhances testing stability. The retraction mechanism dynamically stores the rollers to avoid testing interference. The adjustment mechanism controls horizontal positioning through a movable component and adjusts vertical height through a lifting component, enabling the pressure transmission rod to precisely adapt to the spatial position changes at the junction of the old and new roadbeds, ensuring accurate application of the mechanical load in the compressive strength test, thereby effectively improving the accuracy of the test results.

[0029] 2. In this invention, the synergistic effect of electric drive and mechanical transmission achieves efficient and controllable expansion and contraction of the structure under spatial constraints. The nonlinear linear displacement of the moving block is transformed into a composite motion trajectory of the roller's working end, improving spatial adaptability and range of motion. The limiting component, through two sets of symmetrically arranged limiting rods penetrating the inner cavity of the moving block, constrains its degrees of freedom, effectively suppressing deflection and vibration during operation, and ensuring the linearity and stability of the movement trajectory. The overall structure is integrated into the moving housing, combining compactness, rigidity, and motion accuracy, making it suitable for scenarios with strict requirements for spatial layout and dynamic response.

[0030] 3. In this invention, the modular configuration of the pressure transmission path and the synergy of the adaptive leveling mechanism improve the system's testing accuracy and environmental adaptability. This integrated design combines dynamic pressure loading, mechanical force calibration, and multi-dimensional static leveling functions into a unified structural framework, which not only enhances the measurement reliability under complex working conditions but also avoids sensor drift through rigid mechanical connections, making it suitable for high-precision calibration and heavy-load testing scenarios. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2A front view structural schematic diagram of the present application;

[0033] Figure 3 A side view structural schematic diagram of the present application;

[0034] Figure 4 A rear view structural schematic diagram of the present application;

[0035] Figure 5 A structural schematic diagram of the contraction mechanism and the supporting mechanism;

[0036] Figure 6 A structural side view of the adjusting mechanism;

[0037] Figure 7 A structural front view of the adjusting mechanism.

[0038] Wherein: 1, moving box; 2, roller; 3, pressure transmission rod; 4, contraction motor; 5, third bidirectional screw rod; 6, moving block; 7, mounting block; 8, first variable plate; 9, second variable plate; 10, limiting rod; 11, supporting plate; 12, rotating motor; 13, rotating rod; 14, gear; 15, sliding plate; 16, rack; 17, telescopic rod; 18, mounting plate; 20, servo motor; 21, first bidirectional screw rod; 22, fixed plate; 23, second bidirectional screw rod; 24, adjusting block; 25, rotating wheel; 26, rotating plate; 27, lifting plate; 28, sliding groove; 29, sliding block; 31, placing groove; 32, pressure distribution plate; 33, lever; 34, weight tray; 35, weight body; 36, connecting plate; 37, lifting screw rod; 38, supporting bottom plate. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0040] Embodiment 1;

[0041] Please refer to Figures 1-7In the embodiment of the present application, a road widening intersection subgrade compression resistance test device is provided, comprising: a moving box 1, support mechanisms are arranged on both sides of the moving box 1, rollers 2 are installed in the inner cavity of the moving box 1, the rollers 2 are arranged in four groups and in a rectangular array, and a pressure transmission rod 3 is arranged on the top of the moving box 1; a contraction mechanism, which is located in the inner cavity of the moving box 1 and is used for contraction of the rollers 2; an adjusting mechanism, which is located on the top of the contraction mechanism and is used for adjusting the position and height of the pressure transmission rod 3, and the adjusting mechanism comprises a moving assembly and a lifting assembly, the moving assembly is located on the top of the moving box 1 and is used for moving the position of the pressure transmission rod 3, and the lifting assembly is located on the top of the moving assembly and is used for adjusting the height of the pressure transmission rod 3.

[0042] The contraction mechanism comprises a contraction motor 4 installed on one side of the moving box 1, a third bidirectional screw rod 5 is installed on one side of the output shaft of the contraction motor 4, the contraction motor 4 and the third bidirectional screw rod 5 are connected through a shaft coupling, a moving block 6 is threadedly connected to the outer ring of the third bidirectional screw rod 5, the moving block 6 is arranged in two groups and in a symmetrical distribution, a variable assembly is arranged on the bottom of the moving block 6, and a limiting assembly is installed in the inner cavity of the moving box 1. The variable assembly comprises an installation block 7 installed in the inner cavity of the moving box 1, a first variable plate 8 is hinged to the bottom of the moving block 6, a second variable plate 9 is hinged in the inner cavity of the installation block 7, the first variable plate 8 and the second variable plate 9 are connected through a hinge, and the rollers 2 are installed at the bottom of the hinge. The limiting assembly comprises limiting rods 10 installed in the inner cavity of the moving box 1, the limiting rods 10 are arranged in two groups and in a symmetrical distribution, and the limiting rods 10 are inserted into the inner cavities of the moving blocks 6.

[0043] The working principle of the embodiment of the present application is as follows: after the contraction motor 4 is started, the third bidirectional screw rod 5 is driven to rotate through the shaft coupling, and the two groups of symmetrically distributed moving blocks 6 are synchronously and reversely moved along the limiting rods 10. When the moving blocks 6 move downward, the hinged first variable plate 8 and the second variable plate 9 push the hinge to fold downward, so that the rollers 2 are stored in the inner cavity of the moving box 1; conversely, when the moving blocks 6 move upward, the variable assembly is unfolded, and the rollers 2 are extended to the working position. The limiting rods 10 ensure that the movement track of the moving blocks 6 is stable and avoids deviation.

[0044] Embodiment 2;

[0045] Please refer to Figures 1-7 In the embodiment of the present application, the moving assembly comprises a support plate 11 installed on the top of the moving box 1, a rotating motor 12 is installed on the back of the moving box 1, a rotating rod 13 is installed on the top of the output shaft of the rotating motor 12, a gear 14 is installed on the top of the rotating rod 13, a sliding plate 15 is arranged on the top of the support plate 11, a rack 16 is installed on the back of the support plate 11, the gear 14 and the rack 16 are meshed with each other, an extension rod 17 is installed on one side of the sliding plate 15, and the extension rod 17 is fixedly connected with the support plate 11.

[0046] The lifting assembly comprises a mounting plate 18 mounted on the top of the sliding plate 15, the mounting plate 18 is provided with two groups and is symmetrically distributed, the inside of the mounting plate 18 located in the front is internally provided with a servo motor 20, the back of the output shaft of the servo motor 20 is internally provided with a first bidirectional screw rod 21, the top of the sliding plate 15 is internally provided with a fixed plate 22, the fixed plate 22 is provided with two groups and is symmetrically distributed, the fixed plate 22 is internally provided with a second bidirectional screw rod 23, the outer rings of the first bidirectional screw rod 21 and the second bidirectional screw rod 23 are internally provided with an adjusting block 24, the adjusting block 24 is provided with multiple groups and is symmetrically distributed, the top of the adjusting block 24 is internally provided with a linkage assembly. The linkage assembly comprises rotating wheels 25 mounted on the outer rings of the first bidirectional screw rod 21 and the second bidirectional screw rod 23, the rotating wheels 25 are connected through a belt, the top of the rotating plate 26 is hingedly connected with a rotating plate 26, the top of the rotating plate 26 is internally provided with a lifting plate 27, the bottom of the lifting plate 27 is internally provided with a sliding groove 28, the top of the rotating plate 26 is internally provided with a sliding block 29, the sliding block 29 is internally provided with a sliding groove 28, the inside of the sliding plate 15 is internally provided with a circular groove, and the pressure transmission rod 3 is sleeved in the inside of the lifting plate 27.

[0047] The working principle of the embodiment of the present application is that the rotating motor 12 drives the gear 14 to rotate, is engaged with the rack 16 on the back of the supporting plate 11, drives the sliding plate 15 to move transversely, the telescopic rod 17 provides auxiliary support and reset force for the sliding plate 15, and the horizontal position of the pressure transmission rod 3 is accurately adjusted. The servo motor 20 drives the first bidirectional screw rod 21 to rotate, the second bidirectional screw rod 23 is linked through the rotating wheel 25 and the belt, and multiple adjusting blocks 24 are synchronously moved in the opposite direction. When the adjusting block 24 moves upwards, the hingedly connected rotating plate 26 pushes the sliding block 29 to slide in the sliding groove 28 of the lifting plate 27, forces the lifting plate 27 to vertically rise, so that the height of the pressure transmission rod 3 is adjusted; conversely, when the adjusting block 24 moves downwards, the lifting plate 27 descends.

[0048] Embodiment 3;

[0049] Please refer to Figures 1-7 In the embodiment of the present application, the top of the moving box body 1 is internally provided with a placing groove 31, the pressure distribution plate 32 is slidably connected in the inside of the placing groove 31, the pressure distribution plate 32 is connected with the bottom of the pressure transmission rod 3, the lifting plate 27 is hingedly connected with a lever 33 on one side, the lever 33 is internally provided with a weight tray 34 on one side, the weight body 35 is internally provided with a weight tray 34 on the top, and the lever 33 is connected with the pressure transmission rod 3 through a high-carbon-steel force transmission ball.

[0050] The side of the moving box body 1 is provided with a connecting plate 36, the inside of the connecting plate 36 is threadedly connected with a lifting screw 37, and the bottom of the lifting screw 37 is provided with a supporting bottom plate 38. The connecting plate 36 is provided with four groups and is arranged in a rectangular array, the lifting screw 37 is provided with four groups and is arranged in a rectangular array, and the supporting bottom plate 38 is provided with four groups and is arranged in a rectangular array.

[0051] In another embodiment of the present application, a road widening intersection subgrade compression resistance test method is provided. First, the device ensures stability during movement by providing four groups of rollers 2 arranged in a rectangular array, and uses the telescopic function of the rollers 2 to adapt to different test sites and road conditions, greatly facilitating the subgrade compression resistance test work in complex environments. Second, the pressure transmission system of the device is designed with precision, and the moving assembly and the lifting assembly in the adjusting mechanism cooperate with each other to accurately adjust the position and height of the pressure transmission rod 3, thereby ensuring that the pressure is uniformly and accurately transmitted to the surface of the subgrade test piece, effectively improving the accuracy of the test results. Third, the operation process is simple and efficient, and the contraction mechanism and the adjusting mechanism are driven by motors, with high degree of automation. Through simple forward and reverse rotation control of the motor, the rollers 2 can be quickly telescoped and the pressure transmission rod 3 can be adjusted, greatly saving time and labor costs. In addition, the device has small measurement error, the setting of the limiting assembly ensures the stability of the movement track of the moving block 6, avoids the deviation problem, and further ensures the stability and measurement accuracy of the overall structure. The combination of the lever 33 principle and the high-carbon steel force transmission ball further improves the accuracy of load transmission and amplification, thereby reducing the measurement error. At the same time, the device has a wide range of applications, and the rectangular array distribution design of the connecting plate 36 and the lifting screw 37 can flexibly adjust the height of the supporting bottom plate 38 according to actual test requirements, ensuring that the moving box body 1 remains level during subgrade testing at different heights and slopes, and adapting to various test scenarios. Moreover, the device adopts a modular design, and each component is easy to maintain and adjust. For example, the servo motor 20, the bidirectional screw rod and other key components are independently installed, and can be quickly replaced once a problem occurs, almost without affecting the normal operation of the entire device. Finally, the safety of the device is fully guaranteed, and the setting of the auxiliary supporting components such as the telescopic rod 17 effectively enhances the stability and safety of the device, preventing overturning or damage risks caused by accidental situations, and ensuring the safety and reliability of the test process. In summary, the subgrade compression resistance test device of the present application, with its reasonable structure design, simple operation process and precise measurement performance, can significantly improve the efficiency and accuracy of the road widening intersection subgrade compression resistance test, and has broad application prospects and promotional value.

[0052] Specifically, a road widening intersection subgrade compression resistance test method comprises the following steps:

[0053] SS01, start-up preparation: turn on the power supply of the test device, start the control system of the motors in the mobile box 1, such as the retracting motor 4, the rotating motor 12, and the servo motor 20, determine the initial position of the roller 2 through the limiting rod 10 installed in the inner cavity of the mobile box 1, ensure that the roller 2 is in the retracted state, set the target position, height, pressure, and other operating parameters of the pressure transmission rod 3 in the control terminal, and check whether the components such as the lever 33, the weight tray 34, and the weight body 35 are in the appropriate position;

[0054] SS02, position adjustment: start the rotating motor 12 to drive the gear 14 to rotate, drive the sliding plate 15 to move horizontally along the support plate 11 through the meshing with the rack 16, and move the pressure transmission rod 3 to the set horizontal position. During the movement, the extension rod 17 provides auxiliary support and reset force to ensure the smooth movement of the pressure transmission rod 3;

[0055] SS03, roller extension control: according to the road conditions of the test site, start the retracting motor 4 to drive the third bidirectional screw 5 to rotate through the shaft coupling, move the two groups of symmetrical moving blocks 6 along the limiting rod 10 in the opposite direction. When the moving blocks 6 move upwards, the first variable plate 8 and the second variable plate 9 are unfolded, and the roller 2 extends to the working position to facilitate the movement of the device in the test site. When the moving blocks 6 move downwards, the roller 2 is retracted into the inner cavity of the mobile box 1 to ensure the stability during the test;

[0056] SS04, pressure application and adjustment: place the weight body 35 on the weight tray 34, amplify the load through the lever arm ratio, transfer it to the pressure transmission rod 3 through the high-carbon steel force transmission ball, start the servo motor 20 to drive the first bidirectional screw 21 to rotate, and move the adjusting block 24 in the opposite direction synchronously through the rotating wheel 25 and the belt linkage second bidirectional screw 23, so as to adjust the height of the pressure transmission rod 3 and realize the application of different pressures on the roadbed test piece;

[0057] SS05, test operation: during the test, observe the pressure distribution of the pressure distribution plate 32 on the roadbed test piece, adjust the height of the lifting screw 37 to ensure that the mobile box 1 remains horizontal during the test on the roadbed with different slopes, eliminate the measurement error caused by the uneven foundation, and at the same time, according to the test needs, the position and height of the pressure transmission rod 3 can be adjusted again for multiple tests to obtain accurate compression data,

[0058] SS06, result recording and analysis: after each test is completed, record the position, height, applied pressure of the pressure transmission rod 3, and the deformation of the roadbed test piece, compare the test results, analyze the compression resistance performance of the junction between the new and old roadbeds, and provide scientific basis for road widening engineering.

[0059] The working principle of the embodiment of the present application is that the weight body 35 is placed on the weight tray 34, the load is amplified by the lever 33 with a force arm ratio of 1:10, and is transmitted to the pressure transmission rod 3 through the high-carbon steel force transmission ball. The pressure transmission rod 3 disperses the concentrated load to the pressure distribution plate 32, and uniformly acts on the surface of the roadbed test piece to simulate the actual road load. The rotating lifting screw 37 can fine-tune the height of the supporting bottom plate 38, and through the cooperative action of the four groups of rectangular array distributed connecting plates 36, it ensures that the moving box body 1 remains horizontal during the test, and eliminates the measurement error caused by the uneven foundation.

[0060] Although embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A roadbed compressive strength testing device at the junction of road widening, characterized in that, include: The movable box (1) is provided with support mechanisms on both sides. Rollers (2) are installed in the inner cavity of the movable box (1). The rollers (2) are arranged in four sets and distributed in a rectangular array. A pressure transmission rod (3) is provided on the top of the movable box (1). A retraction mechanism, which is located in the inner cavity of the movable housing (1) and is used for the retraction of the roller (2); The adjustment mechanism is located on top of the retraction mechanism and is used to adjust the position and height of the pressure transmission rod (3). The adjustment mechanism includes a moving component and a lifting component. The moving component is located on top of the moving housing (1) and is used to move the position of the pressure transmission rod (3). The lifting component is located on top of the moving component and is used to adjust the height of the pressure transmission rod (3).

2. The roadbed compressive strength test device at the intersection of road widening according to claim 1, characterized in that: The shrinking mechanism includes a shrinking motor (4) installed on one side of the movable housing (1). A third bidirectional lead screw (5) is installed on one side of the output shaft of the shrinking motor (4). The shrinking motor (4) and the third bidirectional lead screw (5) are connected by a coupling. The outer ring of the third bidirectional lead screw (5) is threaded with a moving block (6). Two sets of moving blocks (6) are provided and are symmetrically distributed. A variable component is provided at the bottom of the moving block (6). A limit component is installed in the inner cavity of the movable housing (1).

3. The roadbed compressive strength test device at the intersection of road widening according to claim 2, characterized in that: The variable component includes a mounting block (7) installed in the inner cavity of the movable housing (1), a first variable plate (8) is hinged to the bottom of the movable block (6), a second variable plate (9) is hinged to the inner cavity of the mounting block (7), the first variable plate (8) and the second variable plate (9) are rotatably connected by a hinge, and the roller (2) is installed at the bottom of the hinge.

4. The roadbed compressive strength test device at the intersection of road widening according to claim 2, characterized in that: The limiting assembly includes a limiting rod (10) installed in the inner cavity of the movable housing (1). The limiting rod (10) is provided in two sets and is symmetrically distributed. The limiting rod (10) is inserted into the inner cavity of the movable block (6).

5. The roadbed compressive strength test device at the intersection of road widening according to claim 1, characterized in that: The moving assembly includes a support plate (11) mounted on the top of the moving housing (1), a rotating motor (12) mounted on the back of the moving housing (1), a rotating rod (13) mounted on the top of the output shaft of the rotating motor (12), a gear (14) mounted on the top of the rotating rod (13), a sliding plate (15) provided on the top of the support plate (11), a rack (16) mounted on the back of the support plate (11), the gear (14) and the rack (16) meshing with each other, a telescopic rod (17) mounted on one side of the sliding plate (15), and the telescopic rod (17) fixedly connected to the support plate (11).

6. The roadbed compressive strength test device at the intersection of road widening according to claim 5, characterized in that: The lifting assembly includes a mounting plate (18) installed on the top of the sliding plate (15). The mounting plate (18) is provided in two sets and is symmetrically distributed. A servo motor (20) is installed inside the mounting plate (18) located on the front. A first bidirectional lead screw (21) is installed on the back of the output shaft of the servo motor (20). A fixing plate (22) is installed on the top of the sliding plate (15). The fixing plate (22) is provided in two sets and is symmetrically distributed. A second bidirectional lead screw (23) is installed between the fixing plates (22). Adjusting blocks (24) are installed on the outer rings of the first bidirectional lead screw (21) and the second bidirectional lead screw (23). Multiple sets of adjusting blocks (24) are provided and are symmetrically distributed. A linkage assembly is installed on the top of the adjusting block (24).

7. The roadbed compressive strength test device at the intersection of road widening according to claim 6, characterized in that: The linkage assembly includes rotating wheels (25) installed on the outer rings of the first bidirectional lead screw (21) and the second bidirectional lead screw (23). The rotating wheels (25) are connected by a belt. The top of the adjusting block (24) is hinged to a rotating plate (26). The top of the rotating plate (26) is provided with a lifting plate (27). The bottom of the lifting plate (27) is provided with a sliding groove (28). The top of the rotating plate (26) is provided with a sliding block (29). The sliding block (29) slides inside the sliding groove (28). The inside of the sliding plate (15) is provided with a circular groove. The pressure transmission rod (3) is fitted inside the lifting plate (27).

8. The roadbed compressive strength test device at the intersection of road widening according to claim 7, characterized in that: The top of the movable box (1) is provided with a placement slot (31), and a pressure distribution plate (32) is slidably connected inside the placement slot (31). The pressure distribution plate (32) is connected to the bottom of the pressure transmission rod (3). A lever (33) is hinged to one side of the lifting plate (27). A weight tray (34) is installed on one side of the lever (33). A weight body (35) is installed on the top of the weight tray (34). The lever (33) and the pressure transmission rod (3) are connected by a high-carbon steel force transmission ball.

9. The roadbed compressive strength test device at the intersection of road widening according to claim 1, characterized in that: A connecting plate (36) is installed on one side of the movable box (1). A lifting screw (37) is threaded inside the connecting plate (36). A supporting base plate (38) is installed at the bottom of the lifting screw (37). The connecting plate (36) is arranged in four sets in a rectangular array. The lifting screw (37) is arranged in four sets in a rectangular array. The supporting base plate (38) is arranged in four sets in a rectangular array.

10. A method for testing the compressive strength of roadbed at the junction of a widened road, implemented using the roadbed compressive strength testing device as described in any one of claims 1-9, characterized in that, The method includes the following steps: SS01. Connect the power supply of the test device and start the control system of the retraction motor (4), rotation motor (12), and servo motor (20) in the moving box (1). Determine the initial position of the roller (2) by the limit rod (10) installed in the inner cavity of the moving box (1) to ensure that the roller (2) is in the retracted state. Set the target position, height, and pressure operation parameters of the pressure transmission rod (3) in the control terminal and check whether the lever (33), weight tray (34), and weight body (35) are in the appropriate position. SS02. Start the rotating motor (12) to drive the gear (14) to rotate. Through meshing with the rack (16), the sliding plate (15) is driven to move laterally along the support plate (11), so that the pressure transmission rod (3) moves to the set horizontal position. During the movement, the telescopic rod (17) provides auxiliary support and reset force to ensure the smooth movement of the pressure transmission rod (3). SS03. Based on the road conditions of the test site, start the retraction motor (4) and drive the third bidirectional lead screw (5) to rotate through the coupling, so that the two sets of symmetrically distributed moving blocks (6) move in opposite directions along the limit rod (10). When the moving block (6) moves upward, it drives the first variable plate (8) and the second variable plate (9) to unfold, and the roller (2) extends to the working position so that the device can move in the test site. When the moving block (6) moves downward, the roller (2) retracts into the inner cavity of the moving box (1) to ensure stability during the test. SS04. Place the weight body (35) on the weight tray (34), amplify the load through the lever (33) lever arm ratio, and transmit it to the pressure transmission rod (3) through the high carbon steel force transmission ball. Start the servo motor (20) to drive the first bidirectional lead screw (21) to rotate. Through the rotating wheel (25) and belt linkage, the second bidirectional lead screw (23) is linked to make the adjusting block (24) move synchronously in the opposite direction, thereby adjusting the height of the pressure transmission rod (3) and realizing the application of different pressures to the roadbed specimen. SS05. During the test, observe the pressure distribution plate (32) on the roadbed specimen. By adjusting the height of the lifting screw (37), ensure that the moving box (1) remains horizontal in roadbed tests with different slopes to eliminate measurement errors caused by uneven foundation. At the same time, according to the test requirements, the position and height of the pressure transmission rod (3) can be adjusted again to conduct multiple tests to obtain accurate compressive strength data. SS06. After each test, record the position, height, applied pressure of the pressure transmission rod (3) and the deformation data of the roadbed specimen. By comparing the results of multiple tests, analyze the compressive strength at the junction of the old and new roadbeds to provide a scientific basis for the road widening project.

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