Highway subgrade pavement strength detection device

Abstract

The invention provides a highway subgrade pavement strength detection device. The highway subgrade pavement strength detection device comprises a beam body. According to the highway subgrade pavement strength detection device provided by the invention, a telescopic column is arranged to adapt to an undulating pavement so as to avoid suspension or overpressure of a detection probe, two second push plates are arranged to cooperate with a leveling spring, so that traditional hard contact limiting is avoided, wind power is inhibited from influencing shaking of a beam body, and reading distortion of a dial indicator is avoided; the accuracy of deflection value detection is affected, the height of the dial indicator can be freely adjusted by arranging the fastening piece to better adapt to the height of the beam body, the measuring head is arranged to be stored in the beam body when not used for detection, and the measuring head is rotationally contacted with the road surface during detection, so that the situation that the measuring head is exposed in the environment, damaged and deformed to easily cause inaccurate detection results is avoided, and the detection accuracy is improved. The temperature sensor is arranged to detect the road surface temperature, and the temperature display is used for a worker to read and record the temperature of a detection site so as to correct data measured by the dial indicator.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of roadbed pavement strength detection, and in particular to a roadbed pavement strength detection device. BACKGROUND

[0002] Roadbed pavement strength detection is a core link for guaranteeing road structure safety and service life, and its core indexes include deflection value, modulus of resilience, CBR value and the like. The deflection value and modulus of resilience are important indexes for reflecting roadbed pavement strength. The deflection value measurement method specified in the roadbed pavement detection standard is the Beckman beam method. The Beckman beam method is a standard method for measuring the deflection of roadbed pavement in highway engineering, and belongs to static detection technology, and is mainly used for evaluating the strength of pavement structure and judging the stability of roadbed.

[0003] The existing roadbed pavement strength detection device adjusts the height of the four corners of the first connecting plate by rotating the first fixed rod to drive the first threaded sleeve to rotate along the first threaded support rod, adjusts the placement of the first connecting plate on the road surface, places the first connecting plate horizontally, moves the dial gauge to the center position in front of the front end of the front and rear lever mechanism by screwing the first adjusting screw rod to make the first sliding block slide along the first sliding groove, and then the dial gauge is fully attached to the front end of the front and rear lever mechanism according to the detection requirements. Then, the test vehicle is started to detect and read the data.

[0004] However, the existing roadbed pavement strength detection device has the problem that the Beckman beam is relatively long and is easily affected by outdoor wind and other factors to produce transverse shaking, resulting in distortion of the dial gauge reading and affecting the accuracy of deflection value detection.

[0005] Therefore, it is necessary to provide a roadbed pavement strength detection device to solve the above technical problems. SUMMARY

[0006] The present application provides a roadbed pavement strength detection device, which solves the problem that the beam body shakes due to the influence of environmental factors during outdoor detection, affecting the accuracy of deflection value detection.

[0007] To solve the above technical problems, the present application provides a roadbed pavement strength detection device, which comprises a beam body.

[0008] A measuring head is rotatably installed in the interior of the front end of the beam body.

[0009] A support mechanism is arranged on the ground to support the beam body.

[0010] The leveling mechanism is located at the rear end of the beam body and is arranged on the ground. The leveling mechanism comprises leveling screws. Four leveling screws are fixedly installed on the ground through four suction cup bases. The bottoms of the four leveling screws are rotatably installed in the interiors of the four suction cup bases. A cross support plate is threadedly connected to the four leveling screws. A bearing plate is fixedly installed on the top of the cross support plate through four leveling struts. A sliding groove is formed in the top of the bearing plate. Sliding platforms are symmetrically and slidably connected in the sliding groove. First push plates are fixedly installed on the tops of the two sliding platforms. Second push plates are fixedly connected to the first push plates through leveling springs.

[0011] The detection mechanism is fixedly installed on the top of the bearing plate. The detection mechanism is used for detecting the road surface deflection value in cooperation with the beam body.

[0012] A temperature sensor is fixedly installed on the bottom of the beam body and is used for detecting the ground temperature.

[0013] A temperature display is fixedly installed on the top of the beam body and is used for reading the temperature by the staff.

[0014] Preferably, the support mechanism comprises telescopic columns. The four telescopic columns are arranged on the ground. A support seat is fixedly installed on the tops of the four telescopic columns. Support plates are symmetrically and fixedly installed on the top of the support seat. Fixed rods are fixedly installed in the interiors of the two support plates through nuts. The inner surface of the middle part of the fixed rod is rotatably connected to the interior of the beam body.

[0015] Preferably, the detection mechanism comprises a support column. The support column is fixedly installed on the top of the bearing plate. A dial indicator is fixedly installed on the surface of the support column through a connecting plate. The bottom of the dial indicator is adaptively installed on the top of the rear end of the beam body. The support column and the connecting plate are slidably connected. The support column and the connecting plate are fixedly installed through a fastening piece.

[0016] Preferably, two positioning mechanisms are fixedly installed in the interior of the beam body. The positioning mechanism comprises a positioning shaft. The positioning shaft is fixedly installed in the interior of the beam body. First shaft sleeves are rotatably installed at the two ends of the positioning shaft. A first positioning plate is fixedly installed on the surfaces of the two first shaft sleeves. A second shaft sleeve is fixedly installed on the surface of the middle part of the positioning shaft. A second positioning plate is fixedly installed on the surface of the second shaft sleeve. Connecting blocks are fixedly installed on the sides, which are opposite to the first positioning plate, of the second positioning plate. The two connecting blocks are fixedly connected through a positioning spring.

[0017] Preferably, the inside of the beam body is provided with a moving groove, a limiting mechanism is slidably connected in the inside of the moving groove, the limiting mechanism comprises a limiting rod, the limiting rod is slidably connected in the inside of the moving groove, limiting plates are fixedly installed at the two ends of the limiting rod, the limiting plates are adapted to be installed with the rear wheels of the test vehicle, connecting rods are fixedly and symmetrically installed on the surface of the limiting rod, the two connecting rods are adapted to be installed with the first limiting plate and the second limiting plate respectively, abutting blocks are fixedly installed on the opposite sides of the two connecting rods, and extension plates are fixedly installed at the bottom of the two connecting rods and are slidably connected with the horizontal grooves formed at the bottom of the front end of the beam body.

[0018] Preferably, an abutting plate is fixedly installed on the surface of the measuring head and is adapted to be installed with the two abutting blocks.

[0019] Preferably, two buckles are fixedly and symmetrically installed on the surface of the beam body and are adapted to be installed with the limiting rod.

[0020] Preferably, pendulum mechanisms are fixedly installed at the bottom of the front end and the rear end of the beam body respectively, each pendulum mechanism comprises a fixed ring, the fixed rings are fixedly installed at the bottom of the front end and the rear end of the beam body respectively, and a pendulum is movably installed on the fixed ring through a connecting piece.

[0021] Preferably, an auxiliary mounting piece is fixedly installed at the front end of the beam body.

[0022] Preferably, a level is fixedly installed at the top of the bearing plate.

[0023] Compared with the related art, the highway roadbed pavement strength detection device has the following beneficial effects:

[0024] The highway roadbed pavement strength detection device can adapt to the undulating road surface, avoid the detection measuring head from being suspended or over-pressured, avoid the traditional hard contact limiting and the influence of wind on the beam body, avoid the distortion of the dial gauge reading, and affect the accuracy of the deflection value detection, freely adjust the height of the dial gauge to better adapt to the height of the beam body, collect the measuring head in the inside of the beam body when not detecting, rotate to contact the road surface when detecting, avoid the measuring head from being exposed to the environment and being damaged, cause deformation, and easily lead to inaccurate detection results, detect the road surface temperature through the temperature sensor, read the temperature by the temperature display, record the temperature of the detection site, and correct the data measured by the dial gauge. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The structure diagram of a preferred embodiment of the highway roadbed pavement strength detection device is shown.

[0026] Figure 2 This is another structural schematic diagram of a preferred embodiment of a highway roadbed and pavement strength detection device;

[0027] Figure 3 for Figure 2 An enlarged schematic diagram of section A is shown;

[0028] Figure 4 for Figure 2 A schematic structural diagram of the support mechanism shown;

[0029] Figure 5 for Figure 2 The structural diagram of the leveling mechanism shown;

[0030] Figure 6 for Figure 2 Another structural schematic diagram of the leveling mechanism shown;

[0031] Figure 7 for Figure 2 The structural diagram of the detection mechanism shown;

[0032] Figure 8 This is an assembly diagram of a highway subgrade and pavement strength testing device;

[0033] Figure 9 for Figure 8 The structural diagram of the positioning mechanism shown;

[0034] Figure 10 for Figure 8 The structural diagram of the limiting mechanism shown;

[0035] Figure 11 for Figure 10 An enlarged schematic diagram of the structure of portion B is shown;

[0036] Figure 12 for Figure 8 An enlarged schematic diagram of section C is shown;

[0037] Figure 13 for Figure 8 The structural diagram of the pendulum mechanism shown;

[0038] Figure 14 for Figure 8 An enlarged schematic diagram of portion D is shown;

[0039] Figure 15 for Figure 11 The installation diagram of the extension plate is shown in the figure.

[0040] The figure mark: 1, beam body, 2, measuring head, 3, support mechanism, 301, telescopic column, 302, support seat, 303, support plate, 304, fixed rod, 4, leveling mechanism, 401, leveling screw, 402, cross support plate, 403, leveling support column, 404, bearing plate, 405, sliding groove, 406, sliding table, 407, first push plate, 408, leveling spring, 409, second push plate, 410, suction cup base, 5, detection mechanism, 501, support column, 502, connecting plate, 503, dial indicator, 504, fastening piece, 6, positioning mechanism, 601, positioning shaft, 602, first shaft sleeve, 603, first positioning plate, 604, second shaft sleeve, 605, second positioning plate, 606, connecting block, 607, positioning spring, 7, limiting mechanism, 701, limiting rod, 702, limiting plate, 703, connecting rod, 704, abutting block, 705, extension plate, 8, pendulum mechanism, 801, fixed ring, 802, connecting piece, 803, pendulum, 9, auxiliary mounting piece, 10, level, 11, temperature sensor, 12, temperature display, 13, abutting plate, 14, buckle, 15, moving groove. DETAILED DESCRIPTION

[0041] The application will be further described below in conjunction with the drawings and embodiments.

[0042] First embodiment

[0043] Please refer to Figures 1-7 A highway roadbed pavement strength detection device, 1, comprising: a beam body 1;

[0044] A measuring head 2 is rotatably installed inside the front end of the beam body 1;

[0045] A support mechanism 3 is arranged on the ground to support the beam body 1;

[0046] A leveling mechanism 4 is located at the rear end of the beam body 1 and arranged on the ground, the leveling mechanism 4 includes leveling screws 401, four leveling screws 401 are fixedly installed on the ground through four suction cup bases 410, the bottoms of the four leveling screws 401 are rotatably installed inside the four suction cup bases 410, the four leveling screws 401 are commonly threadedly connected with a cross support plate 402, the top of the cross support plate 402 is fixedly installed with a bearing plate 404 through four leveling support columns 403, the top of the bearing plate 404 is provided with a sliding groove 405, the inside of the sliding groove 405 is symmetrically slidably connected with sliding tables 406, the tops of the two sliding tables 406 are fixedly installed with first push plates 407, the first push plates 407 are fixedly connected with second push plates 409 through leveling springs 408;

[0047] Detection mechanism 5, the detection mechanism 5 is fixedly installed on the top of the bearing plate 404, the detection mechanism 5 is used to cooperate with the beam body 1 to detect the road surface deflection value;

[0048] Temperature sensor 11, the temperature sensor 11 is fixedly installed on the bottom of the beam body 1 for detecting ground temperature;

[0049] Temperature display 12, the temperature display 12 is fixedly installed on the top of the beam body 1 for reading temperature for staff.

[0050] The support mechanism 3 includes telescopic columns 301, four telescopic columns 301 are arranged on the ground, and the top of the four telescopic columns 301 is fixedly installed with a support seat 302, the top of the support seat 302 is fixedly installed with a support plate 303 in a symmetrical manner, the inside of the two support plates 303 is fixedly installed with a fixed rod 304 through nuts, and the surface of the middle portion of the fixed rod 304 is rotatably connected with the inside of the beam body 1.

[0051] The detection mechanism 5 includes a support column 501, the support column 501 is fixedly installed on the top of the bearing plate 404, the surface of the support column 501 is fixedly installed with a dial gauge 503 through a connecting plate 502, the bottom of the dial gauge 503 is matched and installed with the top of the rear end of the beam body 1, the support column 501 and the connecting plate 502 are slidably connected, and the support column 501 and the connecting plate 502 are fixedly installed through a fastening piece 504.

[0052] In actual use, the beam body 1 is a Beckman beam body, one end of the beam body 1 away from the dial gauge 503 is a front end, the other end of the beam body 1 is a rear end, the measuring head 2 can be replaced periodically and is arranged in the inside of the beam body 1 in an initial state, and the first push plate 407, the leveling spring 408 and the second push plate 409 are all provided with two groups.

[0053] The working principle of the highway roadbed pavement strength detection device provided by the application is as follows:

[0054] First, the test vehicle is driven to the position of the road surface to be detected, the beam body 1 is placed between the two rear wheels of the test vehicle by manual operation after the test vehicle reaches the position, the beam body 1 is stopped after passing through the gap between the rear wheels to the front five centimeters, the test vehicle rear wheel has two groups, so two beam bodies 1 are placed, the measuring head 2 is manually rotated to contact the point position of the road surface to be detected, the temperature sensor 11 is arranged, the road surface temperature is detected after the installation of the beam body 1 is completed, the temperature is read by the temperature display 12 for the staff, and the temperature of the detection site is recorded.

[0055] Then, the telescopic column 301 is manually adjusted to make the measuring head 2 contact the ground, and then the leveling mechanism 4 and the detection mechanism 5 are manually installed at the rear end of the beam body 1, four suction disc bases 410 are installed first, and then the bearing plate 404 is leveled by rotating the four leveling screws 401 until it is level with the ground. After adjustment, the dial gauge 503 is adjusted to a position in contact with the top of the rear end of the beam body 1, and then locked, and then the two sliding platforms 406 are manually pushed to move to the positions on both sides of the beam body 1, at this time, the two second push plates 409 are not in contact with the beam body 1, so as to avoid the beam body 1 from being affected by environmental factors such as wind to cause data distortion, and the leveling spring 408 can control the wind disturbance error to improve the detection accuracy.

[0056] Then, the test vehicle is started to move at a speed of 5km / h, and during the movement, the dial gauge 503 is manually read, and after reading the results, the beam body 1 is moved to repeat the above process to detect the next detection point.

[0057] Compared with the related art, the highway roadbed pavement strength detection device provided by the application has the following beneficial effects:

[0058] The telescopic column 301 can adapt to the undulating road surface to avoid the detection measuring head 2 from being suspended or over-pressured, the two second push plates 409 cooperate with the leveling spring 408 to avoid the traditional hard contact limiting and inhibit the wind from affecting the beam body 1 to shake, avoid the dial gauge 503 from reading distorted, and the accuracy of the deflection value detection is affected, the height of the dial gauge 503 can be freely adjusted by the fastening piece 504 to better adapt to the height of the beam body 1, the measuring head 2 is retracted in the beam body 1 when not detecting, and is rotated to contact the road surface when detecting, so as to avoid the measuring head 2 from being exposed to the environment to be damaged and deformed, the temperature sensor 11 is arranged to detect the road surface temperature, the temperature display 12 is arranged to provide the staff with readings and record the temperature of the detection site to correct the data measured by the dial gauge 503.

[0059] Second embodiment

[0060] Please refer to Figures 8-15 Based on the first embodiment of the application, the second embodiment of the application provides another highway roadbed pavement strength detection device. The second embodiment is only a preferred mode of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0061] Specifically, the second embodiment of the road embankment pavement strength detection device is different from the first embodiment in that two positioning mechanisms 6 are fixedly installed in the inside of the beam body 1, the positioning mechanism 6 comprises a positioning shaft 601 fixedly installed in the inside of the beam body 1, first shaft sleeves 602 rotatably installed at both ends of the positioning shaft 601, a first positioning plate 603 fixedly installed on the surfaces of the two first shaft sleeves 602, a second shaft sleeve 604 fixedly installed on the surface of the middle part of the positioning shaft 601, a second positioning plate 605 fixedly installed on the surface of the second shaft sleeve 604, and connecting blocks 606 fixedly installed on the sides, opposite to the first positioning plate 603, of the second positioning plate 605 and connected by a positioning spring 607.

[0062] The inside of the beam body 1 is provided with a moving groove 15, the inside of the moving groove 15 is slidably connected with a limiting mechanism 7, the limiting mechanism 7 comprises a limiting rod 701 slidably connected with the inside of the moving groove 15, limiting plates 702 fixedly installed at both ends of the limiting rod 701, the limiting plates 702 being adaptedly installed with the rear wheels of the test vehicle, connecting rods 703 fixedly and symmetrically installed on the surface of the limiting rod 701, the connecting rods 703 being adaptedly installed with the first positioning plate 603 and the second positioning plate 605 respectively, abutting blocks 704 fixedly installed on the sides, opposite to each other, of the connecting rods 703, and extension plates 705 fixedly installed at the bottoms of the connecting rods 703 and slidably connected with the horizontal groove provided at the bottom of the front end of the beam body 1.

[0063] The surface of the measuring head 2 is fixedly installed with an abutting plate 13 adaptedly installed with the two abutting blocks 704.

[0064] The surface of the beam body 1 is fixedly installed with two buckles 14 adaptedly installed with the limiting rod 701.

[0065] In actual use, the connecting rods 703 do not exceed the beam body 1, the buckle 14 is a plastic buckle and can be replaced regularly, and the measuring head 2 has two states, i.e., contacting the ground or being stored in the inside of the beam body 1.

[0066] The working principle of the road embankment pavement strength detection device provided by the embodiment is as follows:

[0067] First, when the beam body is placed between the rear wheels, the two positioning mechanisms 6 contact the rear wheel gaps one after another, and the first positioning plate 603 and the second positioning plate 605 contact the rear wheels. The squeezed first positioning plate 603 and the second positioning plate 605 squeeze the positioning spring 607. Because the tires are stationary, the forces applied on both sides are consistent. The two positioning mechanisms 6 enter the rear wheel gaps one after another. Because the two points determine a straight line, the beam body 1 is automatically straightened to ensure that the beam body 1 is in the middle of the two rear wheels.

[0068] Then, after the two limit plates 702 contact the rear wheels, the limit plates 702 are driven by the force of the rear wheels to drive the limit rods 701 to move in the moving groove 15 toward the rear end of the beam body 1. The movement of the limit rod 701 drives the two connecting rods 703 to move. At this time, the stop block 704 on the connecting rod 703 drives the probe 2 to rotate by rotating the stop plate 13 and then contacts the ground. During the movement, the two connecting rods 703 also contact the two first positioning plates 603 and the two second positioning plates 605. Because the two connecting rods 703 are inside the beam body 1 itself, they will squeeze the two again when they contact the first positioning plate 603 and the second positioning plate 605. At this time, the first positioning plate 603 and the second positioning plate 605 are both separated from the rear wheels that were previously in contact and move toward each other again.

[0069] Finally, when the limit rod 701 finishes moving, it is locked by two buckles 14 to prevent the first positioning plate 603 and the second positioning plate 605 from resetting and contacting the rear wheel again when the test vehicle starts to leave, and keep the first positioning plate 603 and the second positioning plate 605 detached from the rear wheel. After the test is completed, it is manually reset to prepare for the next test.

[0070] Compared with related technologies, the highway subgrade and pavement strength detection device provided in this embodiment has the following beneficial effects:

[0071] By setting the first positioning plate 603 and the second positioning plate 605 to symmetrically squeeze the rear wheel, the beam body 1 is automatically straightened and centered, and the measurement of the beam body 1 between the rear wheel gap is more accurate. At the same time, a positioning spring 607 is set to avoid automatic compensation of the rear wheel deformation. By setting two limit plates 702 to contact the rear wheel and drive the limit rod 701 to move, the limit rod 701 moves and simultaneously drives the stop block 704 to rotate the stop plate 13 to make the probe 2 contact the ground. The connecting rod 703 squeezes the first positioning plate 603 and the second positioning plate 605 to disengage from the rear wheel to avoid contact after the test vehicle is started. The buckle 14 keeps them in a disengaged state and the buckle 14 makes the limit plate 702 disengage from the rear wheel of the test vehicle to avoid contact after the test vehicle is started that affects the measurement data.

[0072] Third embodiment

[0073] Please refer to Figures 8-15The third embodiment of the present application provides another highway subgrade pavement strength detection device.

[0074] Specifically, the third embodiment of the present application provides a highway subgrade pavement strength detection device, which is different from the first embodiment in that the bottom of the front end and the bottom of the rear end of the beam body 1 are respectively fixedly installed with a pendulum mechanism 8.

[0075] The front end of the beam body 1 is fixedly installed with an auxiliary mounting part 9.

[0076] The top of the bearing plate 404 is fixedly installed with a level 10.

[0077] The working principle of the highway subgrade pavement strength detection device provided by the embodiment is as follows:

[0078] By setting two pendulum mechanisms 8, the pendulums 803 are installed inside the fixed rings 801 through the connecting parts 802 after the test vehicle starts, and the two pendulums 803 sway to offset the slight resonance influence of the test vehicle engine after the test vehicle starts, so as to avoid test errors.

[0079] The auxiliary mounting part 9 can be manually held after the beam body 1 passes through the rear wheels to better determine the position.

[0080] The level 10 can confirm whether the bearing plate 404 is in a horizontal position, so as to avoid errors during testing.

[0081] Compared with the related art, the highway subgrade pavement strength detection device provided by the embodiment has the following beneficial effects:

[0082] The two pendulums 803 sway to offset the slight resonance influence of the test vehicle engine after the test vehicle starts, so as to avoid test errors.

[0083] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A roadbed and pavement strength detection device, characterized in that: include: beam body; a probe, the probe being rotatably mounted inside the front end of the beam body; A supporting mechanism, the supporting mechanism being arranged on the ground for supporting the beam; The leveling mechanism is located at the rear end of the beam body and is arranged on the ground, and the leveling mechanism includes a leveling screw, and the four leveling screws are fixedly installed on the ground through four suction cup bases respectively, and the bottoms of the four leveling screws are rotatably installed inside the four suction cup bases, and the four leveling screws are commonly threadedly connected to a cross support plate, and the top of the cross support plate is fixedly installed with a bearing plate through four leveling pillars, and a slide groove is provided on the top of the bearing plate, and a slide is symmetrically slidably connected to the inside of the slide groove, and a first push plate is fixedly installed on the top of the two slides, and the first push plate is fixedly connected to the second push plate through a leveling spring; A detection mechanism, the detection mechanism is fixedly installed on the top of the bearing plate, and the detection mechanism is used to cooperate with the beam body to detect the road surface deflection value; A temperature sensor is fixedly mounted on the bottom of the beam body for detecting ground temperature; A temperature display is fixedly mounted on the top of the beam body for allowing staff to read the temperature.

2. A highway subgrade and pavement strength detection device according to claim 1, characterized in that: The support mechanism includes a telescopic column, four of which are arranged on the ground, and a support base is fixedly installed on the top of the four telescopic columns. A support plate is symmetrically fixedly installed on the top of the support base, and a fixing rod is fixedly installed inside the two support plates through a nut, and the surface of the middle part of the fixing rod is rotatably connected to the inside of the beam body.

3. A roadbed and pavement strength detection device according to claim 1, characterized in that: The detection mechanism includes a pillar, which is fixedly installed on the top of the supporting plate. A dial indicator is fixedly installed on the surface of the pillar through a connecting plate. The bottom of the dial indicator is adapted to be installed on the top of the rear end of the beam body. The pillar is slidably connected to the connecting plate, and the pillar and the connecting plate are fixedly installed by fasteners.

4. A roadbed and pavement strength detection device according to claim 1, characterized in that: Two positioning mechanisms are fixedly installed inside the beam body, and the positioning mechanism includes a positioning shaft, which is fixedly installed inside the beam body, and first sleeves are rotatably installed at both ends of the positioning shaft, and a first positioning plate is fixedly installed on the surfaces of the two first sleeves. A second sleeve is fixedly installed on the surface of the middle part of the positioning shaft, and a second positioning plate is fixedly installed on the surface of the second sleeve. A connecting block is fixedly installed on the side of the second positioning plate opposite to the first positioning plate, and the two connecting blocks are fixedly connected by a positioning spring.

5. A roadbed and pavement strength detection device according to claim 4, characterized in that: A movable groove is provided inside the beam body, and the movable groove is internally slidably connected to a limiting mechanism. The limiting mechanism includes a limiting rod, and the limiting rod is slidably connected to the inside of the movable groove. Both ends of the limiting rod are fixedly installed with limiting plates, and the limiting plates are adapted to be installed with the rear wheels of the test vehicle. Connecting rods are symmetrically fixedly installed on the surface of the limiting rod, and the two connecting rods are adapted to be installed with the first positioning plate and the second positioning plate respectively. A stop block is fixedly installed on the opposite side of the two connecting rods, and an extension plate is fixedly installed on the bottom of the two connecting rods, and the extension plate is slidably connected to the transverse groove provided at the bottom of the front end of the beam body.

6. A highway subgrade and pavement strength detection device according to claim 5, characterized in that: A butt plate is fixedly mounted on the surface of the measuring head, and the butt plate is adapted to be mounted on the two butt blocks.

7. A roadbed and pavement strength detection device according to claim 5, characterized in that: Two clips are symmetrically fixedly installed on the surface of the beam body, and the two clips are adapted to be installed with the limiting rods.

8. The highway subgrade and pavement strength detection device according to claim 1, characterized in that: The bottom of the front end and the rear end of the beam body are respectively fixedly installed with a pendulum mechanism, and the pendulum mechanism includes a fixing ring. The two fixing rings are respectively fixedly installed on the bottom of the front end and the rear end of the beam body, and the fixing rings are movably installed with pendulums through connecting pieces.

9. A roadbed and pavement strength detection device according to claim 1, characterized in that: An auxiliary mounting piece is fixedly mounted on the front end of the beam body.

10. The highway subgrade and pavement strength detection device according to claim 1, characterized in that: A level is fixedly mounted on the top of the carrying plate.

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