A municipal road subgrade thickness measuring device

Abstract

The invention discloses a device for measuring the thickness of a municipal road subgrade, which specifically relates to the field of construction measurement, and comprises a central measuring frame, wherein a telescopic rod is slidably connected inside the central measuring frame, and a central supporting rod is fixedly connected to the bottom end of the telescopic rod, and four groups of hinge blocks are fixedly connected to the outer surface of the central measuring frame, and the four groups of hinge blocks are arranged in a circular ring shape on the outer surface of the central measuring frame, and an auxiliary spring is used to buffer the rebound force of the ground on a drill bit holder to avoid deformation of the positioning thread due to excessive rebound force, and when the auxiliary push block is completely clamped with the auxiliary spring and the drill bit holder, there is rotational friction between the bolt and the auxiliary push block, and the bolt and the drill bit holder are rotated and clamped into the subgrade, thereby realizing that the device can be stabilized on a curved subgrade or an irregular subgrade for detecting environmental deviations, thereby facilitating device detection.

Description

Technical Field

[0001] The present invention relates to the technical field of construction measurement, and more specifically, to a device for measuring the thickness of a municipal road subgrade. Background Art

[0002] With the acceleration of my country's urbanization process, road construction projects are increasing. As a bridge and link between the city and the outside world, roads are an important carrier for rapid economic development. Therefore, it is necessary to pay attention to the quality of road projects. In the process of road project construction, the roadbed is the supporting structure of the road, and its construction quality is directly related to the performance of the road surface;

[0003] It is necessary to master the key points of roadbed construction technology during the road construction process and comprehensively control the quality of roadbed construction. The construction measurement of the roadbed before construction is an important part of the construction preparation stage. On-site construction personnel need to re-measure and review the pile positions, guide points, and leveling points according to the various parameters delivered by the design unit, determine the road engineering construction benchmark, ensure the advancement of subsequent construction layout work, and lay the foundation for the calculation of engineering quantities.

[0004] According to the technical content disclosed in Chinese patent number CN216144316U, the support legs and the spirit level are provided to adjust the horizontality of the measuring component according to different road conditions, prevent the measuring component from tilting during measurement, and avoid measurement errors caused by operational errors. By positioning the positioning component, the position of the roadbed boundary line can be more accurately located, and then the thickness of the roadbed can be accurately measured by the measurement of the ultrasonic rangefinder.

[0005] However, the above scheme ignores the problem of topography during operation. When the ground is uneven, the support legs alone cannot ensure that the equipment is in a relatively stable horizontal position, and the measurement value error is also large. Therefore, we propose a municipal road subgrade thickness measuring device. Summary of the invention

[0006] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a municipal road subgrade thickness measuring device, in which a worker manually rotates the bolt so that the bolt is turned into a positioning socket through a positioning thread, and the bolt squeezes the auxiliary push block, so that the auxiliary push block and the auxiliary spring are in a compressed state. The auxiliary spring is used to buffer the rebound force of the ground on the drill bit holder to avoid deformation of the positioning thread caused by excessive rebound force. When the auxiliary push block, the auxiliary spring and the drill bit holder are fully clamped, there is rotational friction between the bolt and the auxiliary push block, and the bolt and the drill bit holder are rotated and clamped into the subgrade to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for measuring the thickness of a municipal road subgrade, comprising a central measuring frame, wherein a telescopic rod is slidably connected to the interior of the central measuring frame, and the telescopic rod is a telescopic structure. When the device is not moved to the base point position, the telescopic rod is in a storage state. When the device is moved to the base point position, the staff releases the buckle between the telescopic rod and the surface of the central measuring frame, causing the telescopic rod to drive the central support rod to resist the center of the ground, which plays a central support role for the equipment, and is convenient for the spirit level to test the levelness. The bottom end of the telescopic rod is fixedly connected to the central support rod, and the central support rod is fixedly connected to the bottom end of the telescopic rod. Four groups of hinge blocks are fixedly connected to the outer surface of the central measuring frame, and the four groups of hinge blocks are arranged in a circular ring shape on the outer surface of the central measuring frame, so that the large hinge rod can stably clamp the main support frame and make the clamping force of the main support frame more uniform. The bottom end of the hinge block is hinged with a large hinge rod, one side of the large hinge rod is fixedly connected with a curved clamping frame, one side of the large hinge rod is slidably connected with a curved sliding rod through the curved clamping frame, one end of the curved sliding rod is fixedly connected with the main support frame, and the main support frame and the large hinge rod are arranged in a hinged state through the curved clamping frame and the curved sliding rod;

[0008] The outer surface of the main support frame is provided with four groups of positioning platforms, one end of the four groups of positioning platforms is fixedly connected with auxiliary blocks, one end of the two upper groups of auxiliary blocks is hinged with two groups of first clamping rods, one end of the two lower groups of auxiliary blocks is hinged with two groups of second clamping rods, and one end of the central group of auxiliary blocks is hinged with a hydraulic rod, a lower moving rod is hinged between the two groups of the first clamping rod and the second clamping rod, and the hydraulic rod is hinged at one end of the second clamping rod, and the bottom end of the lower moving rod is fixedly connected with a positioning plate. In detail, when the lower moving rod is in a vertical state with the first clamping rod and the second clamping rod, that is, the positioning plate is in contact with the roadbed, the telescopic distance of the hydraulic rod is limited, and at this time the hydraulic rod supports the lower moving rod, and the lower moving rod cannot be deflected. When the hydraulic rod no longer provides supporting force, the first clamping rod and the second clamping rod can be retracted back to their original positions.

[0009] In a preferred embodiment, four groups of positioning holes are provided on the surface of the positioning disk, positioning threads are provided inside the positioning holes, an auxiliary push block is slidably connected to the center of the positioning disk, the bottom end of the auxiliary push block is fixedly connected to an auxiliary spring, the bottom end of the auxiliary spring is fixedly connected to a drill holder, and one end of the drill holder passes through the positioning hole and is fixedly connected to a drill bit. Before the construction of the municipal road, the dry density, compaction degree, fill thickness and water content of the roadbed will cause deviations in the detection environment, which need to be measured. The conventional method of using a support frame cannot fix the device well in these environments. After the positioning disk is fitted with the roadbed, the staff manually rotates the bolt so that the bolt is turned into the positioning hole through the positioning thread, and the bolt squeezes the auxiliary push block.

[0010] In a preferred embodiment, four groups of positioning blocks are provided on the side of the positioning table away from the auxiliary block, and universal wheels are provided at the bottom ends of the positioning blocks. Commonly used measuring devices are installed in a detachable manner, and the staff need to carry the detachable parts and move them to the position where measurement is required. The overall work is relatively cumbersome, and here the staff grasps the fixed handle of the measuring support frame and utilizes the characteristics of the universal wheels to quickly move to the specified position. The top end of the central measuring frame is rotatably connected to a rotating column, and the top end of the rotating column is fixedly connected to the measuring support frame, and fixed handles are fixedly connected to both sides of the measuring support frame, and a detector is provided at one end of the measuring support frame.

[0011] In a preferred embodiment, the curved sliding rod is fixedly connected to one end of the curved clamping frame with a spring, and the curved clamping frame is fixedly installed on the other end of the spring. The central measuring frame is set in a sliding state on the ground through four sets of universal wheels. When the lower rod and the first clamping rod and the second clamping rod are in a vertical state, that is, the positioning plate is in contact with the roadbed, the first clamping rod and the second clamping rod lift the positioning platform so that the universal wheels will not contact the ground. This is to prevent the universal wheels from contacting the ground after the device is positioned, thereby causing the device to deviate from its position, thereby affecting the accuracy of the data.

[0012] In a preferred embodiment, one end of the four groups of large articulated rods is fixedly connected to a fixed block, two groups of first support rods are hinged on both sides of the fixed block, second support rods are hinged on both sides of the fixed block, and a limit rod is hinged between the two groups of the first support rods and the second support rods. When the main support frame is lifted upward, the main support frame slides in the curved clamping frame through the curved sliding rod, and at the same time, the large articulated rod is squeezed by the main support frame, so the large articulated rod is deflected with the articulated block as the base point.

[0013] In a preferred embodiment, the outer surfaces of the two groups of the first support rods are hinged with a first hinge rod, the outer surfaces of the two groups of the second support rods are hinged with a second hinge rod, and the two groups of the first hinge rods and the second hinge rods are respectively hinged with two groups of mating blocks. When the device is in a normal installation state, the staff manually pushes the first support rod and the second support rod to move outward.

[0014] In a preferred embodiment, a positioning rod is hinged at the bottom end of the limit rod, and the positioning rod is inserted between two groups of mating blocks. One end of the two groups of mating blocks is fixedly connected to a cleaning brush rod, and a plurality of groups of brush holes are provided on the surface of the cleaning brush rod. The cleaning brush rod is used to install brushes through the plurality of brush holes for cleaning the floor.

[0015] In a preferred embodiment, the outer surface of the positioning rod is fixedly connected with a locking block, two groups of the second hinge rods are affixed to both sides of the locking block, and both sides of the locking block are rotatably connected with rotating rods, and the two groups of the second hinge rods are arranged in a fixed state with the locking block through the rotating rods, and when the first support rod and the second support rod move the positioning rod outward through the limiting rod, the first support rod and the second support rod simultaneously move the cleaning brush rod outward through the first hinge rod and the second hinge rod, and the cleaning brush rod carries a brush to clean the position to be positioned, and at the same time, the locking block and the rotating rod and the second hinge rod cause the positioning rod to remain without deflection.

[0016] Technical effects and advantages of the present invention:

[0017] 1. The staff rotates the bolt manually so that the bolt is turned into the positioning socket through the positioning thread. The bolt squeezes the auxiliary push block, causing the auxiliary push block and the auxiliary spring to be in a compressed state. The auxiliary spring is used to buffer the rebound force of the ground on the drill bit holder to avoid excessive rebound force causing deformation of the positioning thread. When the auxiliary push block, the auxiliary spring and the drill bit holder are fully clamped, there is a rotational friction between the bolt and the auxiliary push block, and the bolt and the drill bit holder are rotated and clamped into the roadbed, thereby realizing the detection of environmental deviations. The device can be stabilized on a curved roadbed or an irregular roadbed, which is convenient for device detection;

[0018] 2. The first support rod and the second support rod simultaneously move outwards through the first hinge rod and the second hinge rod with the cleaning brush rod, and the cleaning brush rod carries the brush to clean the position to be positioned, and at the same time, the engaging block and the rotating rod and the second hinge rod prevent the positioning rod from deflecting, so that the positioning rod can only move forward and backward. When the positioning rod moves outwards with the first support rod, the positioning rod simultaneously passes through the two sets of fitting blocks and contacts the ground to form a fixation, thereby improving the installation efficiency of the device, and quickly fixing the position while cleaning the installation surface;

[0019] 3. Commonly used measuring devices are installed in a disassembled manner. Workers need to carry the disassembled parts and move them to the position where they need to be measured. The overall work is rather cumbersome. Here, the workers grab the fixed handle of the measuring support frame and use the characteristics of the universal wheel to quickly move to the specified position. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the central measuring frame of the present invention.

[0021] Figure 2 For the present invention Figure 1 A-section structure enlarged view.

[0022] Figure 3 For the present invention Figure 2 Enlarged view of the structure of part B.

[0023] Figure 4 It is a structural schematic diagram of the positioning platform of the present invention.

[0024] Figure 5 It is a schematic diagram of the structure of the measuring frame of the present invention.

[0025] Figure 6 It is a structural schematic diagram of the large articulated rod of the present invention.

[0026] Figure 7 It is a schematic diagram of the cross-sectional structure of the fixing block of the present invention.

[0027] Figure 8 It is a structural schematic diagram of the downward moving rod of the present invention.

[0028] Fig. 9 For the present invention Figure 8 Enlarged view of the C structure.

[0029] The accompanying drawings are marked as follows: 1, central measuring frame; 2, telescopic rod; 3, hinge block; 4, rotating column; 5, measuring support frame; 6, central support rod; 7, main support frame; 8, positioning table; 9, positioning block; 10, cleaning brush rod; 11, large hinge rod; 12, fixed block; 13, first hinge rod; 14, second hinge rod; 15, locking block; 16, rotating rod; 17, positioning plug rod; 18, fitting plug block; 19, first support rod; 20, limit rod; 21, second support rod; 22, auxiliary block; 23, first clamping rod; 24, second clamping rod; 25, universal wheel; 26, hydraulic rod; 27, down-shift rod; 28, positioning plate; 29, positioning socket; 30, detector; 31, curved clamping frame; 32, curved sliding rod; 33, spring; 34, positioning thread; 35, auxiliary push block; 36, auxiliary spring; 37, drill bit holder. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] refer to Figure 1 - Fig. 9, Embodiment 1: A municipal road subgrade thickness measuring device comprises a central measuring frame 1, the interior of the central measuring frame 1 is slidably connected with a telescopic rod 2, the telescopic rod 2 is a telescopic structure, the device has not moved to the base point position, the telescopic rod 2 is in a storage state, when the device moves to the base point position, the staff releases the buckle between the telescopic rod 2 and the surface of the central measuring frame 1, so that the telescopic rod 2 drives the central support rod 6 to resist the center of the ground, which plays a central supporting role for the equipment, which is convenient for the level meter to test the levelness, the bottom end of the telescopic rod 2 is fixedly connected with the central support rod 6, the outer surface of the central measuring frame 1 is fixedly connected with four groups of hinge blocks 3, and the four groups of hinge blocks 3 are arranged in a circular ring shape on the outer surface of the central measuring frame 1, which is to enable the large hinge rod 11 to stably clamp the main support frame 7, so that the clamping force of the main support frame 7 is more uniform, the bottom end of the hinge block 3 is hinged with a large hinge rod 11, and one side of the large hinge rod 11 is fixed The main support frame 7 is fixedly connected with a curved clamping frame 31, and one side of the large articulated rod 11 is slidably connected with a curved sliding rod 32 through the curved clamping frame 31. One end of the curved sliding rod 32 is fixedly connected with the main support frame 7. The main support frame 7 and the large articulated rod 11 are arranged in an articulated state through the curved clamping frame 31 and the curved sliding rod 32. The staff grasps the fixed handle of the measuring support frame 5, and the device slides on the surface of the municipal road to the specified roadbed position through four sets of positioning blocks 9 and universal wheels 25. The staff presses down the lower moving rod 27 until the positioning plate 28 fits with the ground, and the first clamping rod 23, the second clamping rod 24 and the hydraulic rod 26 are bent synchronously with the lower moving rod 27. It is explained here that the telescopic distance of the second clamping rod 24 is limited, and the second clamping rod 24 is used as a drive, so that the first clamping rod 23, the second clamping rod 24 and the hydraulic rod 26 can only rotate counterclockwise to a vertical state with the lower moving rod 27, or return to the original position clockwise;

[0032] The outer surface of the main support frame 7 is provided with four groups of positioning platforms 8, one end of the four groups of positioning platforms 8 is fixedly connected to an auxiliary block 22, one end of the two upper groups of auxiliary blocks 22 is hinged with two groups of first clamping rods 23, one end of the two lower groups of auxiliary blocks 22 is hinged with two groups of second clamping rods 24, one end of the central group of auxiliary blocks 22 is hinged with a hydraulic rod 26, a downward moving rod 27 is hinged between the two groups of first clamping rods 23 and the second clamping rod 24, and the hydraulic rod 26 is hinged at one end of the second clamping rod 24. The bottom end of the lower moving rod 27 is fixedly connected with a positioning plate 28. In detail, when the lower moving rod 27 is in a vertical state with the first clamping rod 23 and the second clamping rod 24, that is, the positioning plate 28 is in contact with the roadbed, the telescopic distance of the hydraulic rod 26 is limited. At this time, the hydraulic rod 26 supports the lower moving rod 27, and the lower moving rod 27 cannot be deflected. When the hydraulic rod 26 no longer provides supporting force, the first clamping rod 23 and the second clamping rod 24 can be retracted to their original positions.

[0033] The surface of the positioning plate 28 is provided with four groups of positioning holes 29, and the interior of the positioning holes 29 is provided with positioning threads 34. The central sliding connection of the positioning plate 28 is provided with an auxiliary push block 35, and the bottom end of the auxiliary push block 35 is fixedly connected with an auxiliary spring 36, and the bottom end of the auxiliary spring 36 is fixedly connected with a drill holder 37, and the drill holder 37 passes through one end of the positioning hole 29 and is fixedly connected with a drill. Before the construction of the municipal road, the dry density, compaction degree, fill thickness, and water content of the roadbed will cause deviations in the detection environment, which need to be measured. The conventional method of using a support frame cannot fix the device well on these environments. After the positioning plate 28 is fitted with the roadbed, the workers The operator manually rotates the bolt so that the bolt is rotated into the positioning socket 29 through the positioning thread 34. The bolt squeezes the auxiliary push block 35, causing the auxiliary push block 35 and the auxiliary spring 36 to be in a compressed state. The auxiliary spring 36 is used to buffer the rebound force of the ground on the drill bit holder 37 to avoid excessive rebound force causing deformation of the positioning thread 34. When the auxiliary push block 35, the auxiliary spring 36 and the drill bit holder 37 are fully clamped, there is a rotational friction force between the bolt and the auxiliary push block 35, and the bolt and the drill bit holder 37 rotate with the drill bit and clamp it into the roadbed, thereby realizing the detection of environmental deviations. The device can be stable on a curved roadbed or an irregular roadbed, which is convenient for device detection.

[0034] refer to Figure 3 - Figure 7 , Embodiment 2: Four groups of positioning blocks 9 are arranged on one side of the positioning platform 8 away from the auxiliary block 22, and a universal wheel 25 is arranged at the bottom end of the positioning block 9. The commonly used measuring device is detachable and installed, and the staff needs to carry the detachable parts to move to the position to be measured, and the overall work is relatively cumbersome. Here, the staff can quickly move to the specified position by grabbing the fixed handle of the measuring support frame 5 and utilizing the characteristics of the universal wheel 25. The top of the central measuring frame 1 is rotatably connected to a rotating column 4, and the top of the rotating column 4 is fixedly connected to a measuring support frame 5. Fixed handles are fixedly connected to both sides of the measuring support frame 5, and one end of the measuring support frame 5 is provided with a detection The device 30 has a spring 33 fixedly connected to one end of the curved sliding rod 32 facing the curved clamping frame 31, and the curved clamping frame 31 is fixedly installed on the other end of the spring 33. The central measuring frame 1 is set in a sliding state on the ground through four sets of universal wheels 25. When the lowering rod 27 is in a vertical state with the first clamping rod 23 and the second clamping rod 24, that is, the positioning plate 28 is in contact with the roadbed, the first clamping rod 23 and the second clamping rod 24 lift the positioning platform 8, so that the universal wheel 25 will not contact the ground. This is to prevent the universal wheel 25 from contacting the ground and causing the device to deviate from the position after the device is positioned, thereby affecting the accuracy of the data.

[0035] refer to Figure 1 - Figure 5Embodiment 3: One end of four groups of large articulated rods 11 is fixedly connected to a fixed block 12, two groups of first support rods 19 are hinged on both sides of the fixed block 12, and second support rods 21 are hinged on both sides of the fixed block 12. A limit rod 20 is hinged between the two groups of first support rods 19 and the second support rods 21. When the main support frame 7 is lifted upward, the main support frame 7 slides in the curved clamping frame 31 through the curved sliding rod 32. At the same time, the large articulated rod 11 is squeezed by the main support frame 7, and the large articulated rod 11 deflects with the articulated block 3 as the base point. The outer surfaces of the two groups of first support rods 19 are hinged with first hinge rods 13, and the two groups of first support rods 19 are hinged with first hinge rods 13. The outer surface of the second support rod 21 is hinged with a second hinge rod 14, and the two groups of first hinge rods 13 and second hinge rods 14 are respectively hinged with two groups of matching plug blocks 18. When the device is in a normal installation state, the staff manually pushes the first support rod 19 and the second support rod 21 to move outward, and the bottom end of the limit rod 20 is hinged with a positioning plug rod 17, which is inserted between the two groups of matching plug blocks 18. One end of the two groups of matching plug blocks 18 is fixedly connected with a cleaning brush rod 10, and the surface of the cleaning brush rod 10 is provided with multiple groups of brush insertion holes. The cleaning brush rod 10 is installed with brushes through the multiple groups of brush insertion holes, which are used to clean the ground;

[0036] The outer surface of the positioning plug rod 17 is fixedly connected with a locking block 15, and the two groups of second hinge rods 14 are attached to the two sides of the locking block 15. The two sides of the locking block 15 are rotatably connected with a rotating rod 16. The two groups of second hinge rods 14 are fixedly arranged with the locking block 15 through the rotating rod 16. When the first support rod 19 and the second support rod 21 move the positioning plug rod 17 outward through the limit rod 20, the first support rod 19 and the second support rod 21 simultaneously move the cleaning brush rod 10 outward through the first hinge rod 13 and the second hinge rod 14, and the cleaning brush rod 10 cleans the position to be positioned with a brush. At the same time, the locking block 15 and the rotating rod 16 and the second hinge rod 14 cause the positioning plug rod 17 to remain undeflected, so that the positioning plug rod 17 can only move forward and backward. When the positioning plug rod 17 moves outward with the first support rod 19, the positioning plug rod 17 simultaneously passes through the two groups of fitting plug blocks 18 and contacts the ground to form a fixation, thereby improving the installation efficiency of the device, and quickly fixing the position while cleaning the installation surface.

[0037] The center stake is used here, and the center stake means taking the nearest conductor point as the measuring station, looking back at the two adjacent conductor points, and setting out the center stake point by dialing the angle. The observed distance and angle are calculated through the coordinates between the three points. When performing leveling, the height of the roadbed should be comprehensively considered, combined with the topographical features, and a construction water reference point should be set up every 200 meters or so along the direction of the highway, and the specific location of each water reference point should be indicated. When measuring, the "fourth-class leveling" measurement operating procedures should be strictly followed. The measuring instrument 30 used must be calibrated, and closed measurements are required for two adjacent leveling points;

[0038] The technical specifications for highway subgrade construction here stipulate that the thickness should not exceed 30cm, and the compacted thickness is calculated based on the loose laying coefficient, and then estimated based on the actual measured thickness, with a limit range of 0-100 cm. This device is used to measure the thickness of a layer, including the surface layer + base layer + subbase layer.

[0039] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0040] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0041] Finally: The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A municipal road subgrade thickness measuring device, comprising a central measuring frame (1), characterized in that: The central measuring frame (1) is slidably connected to a telescopic rod (2), the bottom end of the telescopic rod (2) is fixedly connected to a central supporting rod (6), the outer surface of the central measuring frame (1) is fixedly connected to four groups of hinge blocks (3), and the four groups of hinge blocks (3) are arranged in a circular ring shape on the outer surface of the central measuring frame (1), the bottom end of the hinge block (3) is hinged to a large hinged rod (11), one side of the large hinged rod (11) is fixedly connected to a curved clamping frame (31), one side of the large hinged rod (11) is slidably connected to a curved sliding rod (32) through the curved clamping frame (31), one end of the curved sliding rod (32) is fixedly connected to a main supporting frame (7), and the main supporting frame (7) and the large hinged rod (11) are arranged in a hinged state through the curved clamping frame (31) and the curved sliding rod (32); Four groups of positioning platforms (8) are arranged on the outer surface of the main support frame (7), one end of the four groups of positioning platforms (8) is fixedly connected to an auxiliary block (22), one end of the two upper groups of auxiliary blocks (22) is hinged to two groups of first clamping rods (23), one end of the two lower groups of auxiliary blocks (22) is hinged to two groups of second clamping rods (24), one end of the central group of auxiliary blocks (22) is hinged to a hydraulic rod (26), a downward moving rod (27) is hinged between the two groups of the first clamping rod (23) and the second clamping rod (24), the hydraulic rod (26) is hinged to one end of the second clamping rod (24), and the bottom end of the downward moving rod (27) is fixedly connected to a positioning plate (28); The surface of the positioning plate (28) is provided with four groups of positioning holes (29), the interior of the positioning holes (29) is provided with positioning threads (34), the center of the positioning plate (28) is slidably connected with an auxiliary push block (35), the bottom end of the auxiliary push block (35) is fixedly connected with an auxiliary spring (36), the bottom end of the auxiliary spring (36) is fixedly connected with a drill bit holder (37), and one end of the drill bit holder (37) that passes through the positioning hole (29) is fixedly connected with a drill bit; Four groups of positioning blocks (9) are arranged on one side of the positioning platform (8) away from the auxiliary block (22), and a universal wheel (25) is arranged at the bottom end of each positioning block (9). The top end of the central measuring frame (1) is rotatably connected to a rotating column (4), and the top end of the rotating column (4) is fixedly connected to a measuring support frame (5). Both sides of the measuring support frame (5) are fixedly connected to fixed handles, and one end of the measuring support frame (5) is provided with a detector (30); One end of the curved sliding rod (32) facing the curved clamping frame (31) is fixedly connected to a spring (33), and the curved clamping frame (31) is fixedly mounted on the other end of the spring (33). The central measuring frame (1) is arranged in a sliding state on the ground via four sets of universal wheels (25).

2. A municipal road subgrade thickness measuring device according to claim 1, characterized in that: One end of the four groups of large hinged rods (11) is fixedly connected to a fixed block (12), two groups of first support rods (19) are hinged on both sides of the fixed block (12), and second support rods (21) are hinged on both sides of the fixed block (12), and a limit rod (20) is hinged between the two groups of the first support rods (19) and the second support rods (21).

3. A municipal road subgrade thickness measuring device according to claim 2, characterized in that: The outer surfaces of the two groups of the first support rods (19) are hinged with first hinge rods (13), the outer surfaces of the two groups of the second support rods (21) are hinged with second hinge rods (14), and the two groups of the first hinge rods (13) and the second hinge rods (14) are respectively hinged with two groups of matching plug blocks (18).

4. A municipal road subgrade thickness measuring device according to claim 3, characterized in that: A positioning rod (17) is hingedly connected to the bottom end of the limiting rod (20), and the positioning rod (17) is inserted between two groups of mating plug blocks (18). One end of the two groups of mating plug blocks (18) is fixedly connected to a cleaning brush rod (10), and a plurality of groups of brush insertion holes are provided on the surface of the cleaning brush rod (10).

5. A municipal road subgrade thickness measuring device according to claim 4, characterized in that: The outer surface of the positioning rod (17) is fixedly connected to a locking block (15); two groups of the second hinge rods (14) are attached to two sides of the locking block (15); two sides of the locking block (15) are rotatably connected to rotating rods (16); the two groups of the second hinge rods (14) are fixed to the locking block (15) via the rotating rods (16).

Images