A road surface quality detection method for municipal roads

Abstract

The present invention provides a road quality detection method for municipal roads, which belongs to the field of road detection technology, including core sampling, obtaining a cylindrical road sample column, and then performing quality detection on it. The core drill bit used includes a plurality of drill bars in an annular array, each drill bar has a circular arc cross section, and all drill bars can be close to or away from each other to change the diameter of the drilled road sample column; when performing quality detection on the road sample column, first install it vertically in a container, set a sealing gasket around the top surface of the road sample column, inject dyed leakage water into the sealing gasket, and observe whether the leakage of the leakage water from the surface of the road sample column meets the requirements; apply a rated positive pressure to the road sample column, and observe whether the collapse and deformation of the road sample column meets the requirements. The present invention can quickly and accurately perform qualitative evaluation on road quality, and is simple and practical.

Description

Technical Field

[0001] The invention relates to a road sampling detection technology, in particular to a road surface quality detection method for municipal roads. Background Art

[0002] The quality inspection of municipal road pavement generally tests its bearing strength and water permeability, which are two crucial indicators. The strength is directly related to whether the driving load will cause damage to the road surface and affect its service life, while the water permeability considers the drainage capacity of the rainwater on the road surface in addition to being diverted to both sides on rainy days. If the water permeability is insufficient and the amount of rainwater is not large enough to flow away directly, it will undoubtedly remain on the road surface, causing the road surface to be slippery and easily endangering driving safety.

[0003] As for the above quality inspection elements, the usual practice is to be independent of each other, and each uses a separate inspection equipment, which has low inspection efficiency. During the inspection, for permeability, a pavement permeability infrared detector is directly used. By quickly detecting and evaluating the pavement permeability, the pavement permeability can be quickly and non-destructively evaluated without interfering with traffic. Another pavement permeability inspection technology is the pavement permeability HDS inspection technology, which is a non-destructive inspection technology developed by the National Engineering Laboratory for Highway Maintenance Equipment. Its working principle is that in the absence of the pavement waterproof function, surface water invades the pavement structure layer. After the precipitation stops, the stored water in the permeable pavement continues to evaporate and take away heat, forming a temperature difference with the normal dense pavement. The road surface temperature data is obtained through the infrared sensor system, and the computer processing generates the accurately positioned temperature curve and road surface differential thermal map, so as to realize the detection and recording of the road surface density condition, and judge the road surface permeable area and permeability level according to the relevant algorithm. One of the advantages of these detection methods is that the detection surface is indeed sufficient, but the cost of detection and the complexity of technology must also be considered. It is not applicable to some roads with low grade requirements. Moreover, after the permeability is detected, the strength test is required, which also involves local sampling of the road surface and compression test. When performing the compression test, it is necessary to directly use a core drill or similar drill barrel to take the core sample, obtain a section of road surface cylindrical material of a set size, and then take the material back to the laboratory for strength test. When sampling, the road surface sample in the core drill is often stuck in the drill tool and cannot be removed, or cannot be cut off from the road.

[0004] It can be seen that there is no more compromising detection method in the prior art to carry out road quality detection, which has a certain degree of accuracy, is convenient and efficient, and has good economic applicability. Especially when the road detection volume is large, there is currently no good way to quickly characterize the quality of the current construction road surface. Summary of the invention

[0005] The purpose of the present invention is to provide a road surface quality detection method for municipal roads, which solves the problem that there is currently no economical, efficient and accurate detection method for road surface quality detection, so that technicians can quickly conduct a qualitative assessment of the road surface quality when accepting the road surface.

[0006] To achieve the above object, the present invention adopts a method for detecting the quality of a municipal road pavement, comprising core sampling to obtain a cylindrical pavement sample column, and then performing a quality detection on the cylindrical pavement sample column.

[0007] Step 1: The coring drill bit used includes a plurality of drill bars in an annular array, each drill bar has an arc-shaped cross section, and all the drill bars can move closer to or farther from each other to change the diameter of the drilled pavement sample column;

[0008] Step 2: When testing the quality of the pavement sample column, first install it vertically in a container, set a sealing gasket around the top surface of the pavement sample column, inject dyed leakage water into the sealing gasket, and observe whether the leakage of the leakage water from the surface of the pavement sample column meets the requirements;

[0009] Step three, applying a rated positive pressure to the pavement sample column, and observing whether the collapse deformation of the pavement sample column meets the requirements.

[0010] Furthermore, in step 1, the distances of all drill rods are adjusted to drill out a cylindrical core body with the same diameter as the pavement sample column, and the length of the cylindrical core body is longer than the pavement sample column, and after the cylindrical core body is drilled out, an annular groove is left on the outer side of the cylindrical core body;

[0011] Then, all the drill bars are moved further away from each other by a distance, and this distance allows the drill bars to still partially extend into the annular groove when drilling, and drill vertically along the annular groove that has been drilled, so that the groove width of the annular groove is further expanded, and the drilling is stopped before drilling close to the bottom end of the annular groove. At this time, all the drill bars are brought close to each other, thereby clamping the cylindrical core body in the center of the annular groove and then breaking the cylindrical core body, and the core drill head moves up to take out the cylindrical core body, and the bottom section of the cylindrical core body is cut and smoothed according to the set length of the pavement sample column to obtain the pavement sample column.

[0012] Furthermore, the core drill bit breaks the cylindrical core body in a left-right swinging manner.

[0013] Furthermore, the cutting device is extended into the bottom of the enlarged annular groove to completely or partially cut off the cylindrical core body in the radial direction. When partially cutting off, the core drill bit needs to be moved down into the annular groove again to clamp the cylindrical core body and break it off.

[0014] Furthermore, a plurality of spiral cutting edges are provided on the surface of the drill rod.

[0015] Furthermore, all the drill rods have a connecting block at the top, and a driving bar perpendicular to the drill rod is fixed on the connecting block. The driving bar is connected to a rotating disk rotatably installed in a housing through a flat threaded connection. When the rotating disk rotates, all the driving bars move together or away from each other synchronously, so that the diameter of the annular drill barrel structure surrounded by all the drill rods is reduced or increased.

[0016] Furthermore, a plurality of slide grooves in an annular array are provided on the bottom end surface of the shell, and the connecting block is slidably mounted in the notch of each slide groove; an adjusting column is coaxially fixed at the center of the top end of the rotating disk, and the end of the adjusting column exposed from the shell is axially pressed and fixed by a fixing nut cover threadedly fitted on the shell.

[0017] Furthermore, the container used is a cylindrical cup body placed on the ground, and a plurality of support plates are provided on the side wall near the bottom end of the cup body, all of the support plates are in a ring array, and positioning blocks are installed on the support plates for radial sliding along the cup body, and the bottom ends of the positioning blocks are connected to the threaded disk located below the support plates through connecting parts in a planar threaded manner, so that when the threaded disk rotates, all the positioning blocks move synchronously and coaxially clamp the pavement sample column in the cup body.

[0018] Furthermore, a thread is provided on the inner side wall of the top cup mouth of the cup body, and the bottom port of the sealing gasket has a positioning sink. The sealing gasket is threadedly installed in the cup mouth, and the sink is sealingly attached to the end edge of the top of the pavement sample column, so that when the leakage water is injected into the sealing gasket, it will not flow out from the joint between the sealing gasket and the pavement sample column.

[0019] Furthermore, an external threaded tube is coaxially fixedly connected to the center of the bottom end of the threaded disk, and a supporting disk is coaxially fixed to the center of the top end; when the external threaded tube rotates forward, it is screwed out toward the outside of the cup body, so that the supporting disk is not in contact with the pavement sample column, and the threaded disk clamps the pavement sample column with all the positioning blocks; and when the external threaded tube is reversed, it is screwed into the cup body, so that the supporting disk contacts the pavement sample column, and the threaded disk moves all the positioning blocks away from the pavement sample column to release the pavement sample column, and finally the pavement sample column is axially clamped by the sealing gasket at the upper end and the supporting disk at the lower end; then the hydraulic telescopic cylinder located in the external threaded tube is started to extend until it supports the bottom end of the threaded disk, and finally the stamping equipment is started to apply the rated load to the top surface of the pavement sample column.

[0020] Beneficial effects: The present invention is simple, easy to use, intuitive and easy to understand. It not only solves the problem of difficult coring of road samples, but also allows permeability and strength tests to be completed on one device. Although its detection accuracy is not as good as some existing information-based intelligent integration technologies, it is very practical for road surface detection that requires qualitative evaluation, and the detection cost is low. At the same time, there are no professional and technical restrictions on operation, and ordinary personnel can quickly carry out the test with a little training. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following is a brief introduction to the drawings required for use in the embodiments or descriptions of the prior art. The drawings in the following description are only some embodiments of the present invention and do not represent all specific structures or principles.

[0022] Figure 1 It is a schematic diagram of road surface sampling of the present invention;

[0023] Figure 2 It is a simplified upward view of a coring drill bit;

[0024] Figure 3 is a bottom view of the shell;

[0025] Figure 4 It is a schematic diagram of the further widening of the annular groove by the coring drill bit;

[0026] Figure 5 Schematic diagram of the widened annular groove;

[0027] Figure 6 It is a schematic diagram of the installation of pavement sample columns in water permeability testing and strength testing;

[0028] Figure 7 It is a schematic diagram of a piston rod in a hydraulic telescopic cylinder.

[0029] In the figure, the road surface to be tested 1, the cylindrical core 2, the road surface sample column 3, the coring drill bit 4, the drill rod 401, the connecting block 5, the driving bar 6, the outer shell 7, the slide groove 701, the adjusting column 8, the fixing screw cover 9, the sealing gasket 10, the sinking platform 1001, the supporting plate 11, the positioning block 12, the connecting piece 13, the threaded disk 14, the bearing disk 15, the external threaded tube 16, the hydraulic telescopic cylinder 17, the cup body 18, the rotating disk 19, the annular groove 20, the piston column 21, the top plate 2101, and the protrusion 22. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] As a specific embodiment of the present invention, the municipal road pavement quality detection method mainly includes core sampling to obtain a cylindrical pavement sample column 3, and then perform quality detection on it. The difference is that, Figure 1 The coring drill bit 4 used in the present method comprises a plurality of drill bars 401 in an annular array, and a plurality of spiral cutting edges may be evenly spaced on the surface of the drill bars 401. Figure 2 The cross section of each drill rod 401 is arc-shaped, and all the drill rods 401 can be moved closer or farther away from each other to change the diameter of the road sample column 3 of the road surface 1 to be tested. That is, compared with the traditional coring drill, the coring drill in this embodiment is not a completely closed cylindrical barrel structure, but is surrounded by a number of evenly spaced segments. The gaps between the segments can not only be used for chip discharge, but also the edges on both sides of the segments can be directly processed into cutting edges to directly cut chips in the circumferential direction. Under the action of the cutting edge at the bottom end of the drill rod 401, auxiliary cutting and shaping are performed to obtain a more complete shape of the road sample column 3.

[0032] Then, when conducting a quality inspection on the pavement sample column 3, the pavement sample column 3 is first installed vertically in a container, and a sealing gasket 10 is arranged around the top surface of the pavement sample column 3. This sealing ring can be made of a rigid rotating shell member with a corresponding rubber ring embedded in the inner wall. When testing the water permeability of the pavement, first inject dyed leakage water into the sealing gasket 10, that is, the leakage water is made of clean water and dye, and the dyeing is to better observe the water permeability and observe whether the leakage of the leakage water from the surface of the pavement sample column 3 meets the requirements. After completing the water permeability test, a rated positive pressure is applied to the pavement sample column 3 to observe whether the collapse and deformation of the pavement sample column 3 meets the requirements, and then it is known whether the pavement strength meets the design.

[0033] For the key sample collection process, Figure 1 In this embodiment, the distances of all the drill rods 401 are adjusted to drill out a cylindrical core 2 with the same diameter as the road sample column 3, and the length of the cylindrical core 2 is longer than the road sample column 3. After drilling out the cylindrical core 2, an annular groove 20 is left outside the cylindrical core 2. Then, the operator moves all the drill rods 401 further away from each other, and as shown in FIG. Figure 4 As shown, this distance enables the drill rod 401 to still partially extend into the annular groove 20 when drilling, and drill vertically along the already drilled annular groove 20, so that the groove width of the annular groove 20 is further expanded, for example, expanded to Figure 5The shape shown. When drilling, stop drilling before drilling close to the bottom of the annular groove 20. Note that it cannot be flush with the bottom of the original annular groove 20, let alone exceed it, otherwise the cylindrical core 2 can be clamped directly on the spot for subsequent breaking. That is, stop drilling before drilling close to the bottom of the annular groove 20, and let all the drill bars 401 approach each other to clamp the cylindrical core 2 in the center of the annular groove 20, then break the cylindrical core 2, and move the core drill 4 upward to remove the cylindrical core 2. Since the bottom of the cylindrical core 2 is uneven at this time, the bottom section of the cylindrical core 2 must be cut and smoothed according to the set length of the pavement sample column 3 to obtain a regular pavement sample column 3.

[0034] In practice, the core drill 4 can break the cylindrical core 2 by swinging left and right; when the diameter of the pavement sample column 3 is extremely large, it may not be possible to break it directly. At this time, it is necessary to use a cutting device to extend into the bottom of the enlarged annular groove 20 to completely or partially cut off the cylindrical core 2 in the radial direction. When it is partially cut, the core drill 4 needs to move down into the annular groove 20 again to clamp the cylindrical core 2 and break it. In the above implementation method, the cutting device used can be an existing feasible device such as a water jet, so that after entering the annular groove 20, it can be cut in the radial direction.

[0035] like Figure 1 As shown, a connection block 5 is fixed to the top of each of the drill bars 401, and a driving bar 6 perpendicular to the drill bars 401 is fixed on the connection block 5. The driving bar 6 is connected to a rotating disk 19 rotatably installed in a housing 7 through a flat threaded connection. When the rotating disk 19 rotates, all the driving bars 6 move together or away from each other synchronously, so that the diameter of the annular drill barrel structure surrounded by all the drill bars 401 is reduced or increased, so as to adjust the sampling size and facilitate the clamping of the road sample column 3 or the cylindrical core 2.

[0036] like Figure 3 As shown, specifically, a plurality of slide grooves 701 in an annular array may be provided on the bottom end surface of the housing 7, and a connecting block 5 is slidably mounted in the notch of each slide groove 701, thereby guiding the movement of the driving bar 6. An adjusting column 8 is coaxially fixed at the top center of the rotating disk 19, and the end of the adjusting column 8 exposed from the housing 7 is axially pressed and fixed by a fixing screw cap 9 threadedly fitted on the housing 7, so that the rotating disk 19 is fixed and the shape of the core drill bit 4 remains fixed. In addition, as an alternative, a circle of pin holes (not shown in the figure) may be provided around the rotating disk 19, and when the rotating disk is rotated to the corresponding position, a pin (not shown in the figure) passing through the housing 7 is inserted into the pin hole to fix the rotating disk 19, which is suitable for occasions where a series of sampling sizes are predetermined.

[0037] In more detail, after sampling, when the sample is tested for quality, Figure 6 The container used in this embodiment is a cylindrical cup body 18 placed on the ground, and a plurality of support plates 11 are provided on the side wall near the bottom of the cup body 18. All the support plates 11 are in a ring array, and positioning blocks 12 are installed on the support plates 11 to slide radially along the cup body 18. The bottom end of the positioning block 12 is connected to the threaded disk 14 located below the support plate 11 through a connecting piece 13 in a planar threaded matching manner for transmission, similar to the drive of the aforementioned drill rod 401. When the threaded disk 14 rotates, all the positioning blocks 12 move synchronously, thereby coaxially clamping the pavement sample column 3 in the cup body 18 to achieve positioning of the sample before detection.

[0038] Specifically, if Figure 6 The inner wall of the top cup opening of the cup body 18 is provided with a thread, and the bottom end of the sealing gasket 10 has a positioning sink 1001, such as Figure 6 As shown, the cross section of the sink 1001 can be a right angle to fit the end edge of the cylindrical pavement sample column 3, that is, when the sealing gasket 10 is threadedly installed in the cup mouth, the sink 1001 is sealed and attached to the end edge of the top of the pavement sample column 3, so that when the leakage water is injected into the sealing gasket 10, it will not flow out from the joint between the sealing gasket 10 and the pavement sample column 3, which makes it easy to determine whether the above-mentioned leakage liquid has penetrated from the surface of the sample to prevent false detection.

[0039] In addition, in this detection method, Figure 6An external threaded tube 16 is coaxially fixed to the center of the bottom end of the threaded disk 14, and a carrier disk 15 is coaxially fixed to the center of the top end. When the external threaded tube 16 rotates forward, the external threaded tube 16 is screwed outward from the cup body 18, so that the carrier disk 15 does not contact the pavement sample column 3, and the threaded disk 14 clamps the pavement sample column 3 with all the positioning blocks 12, which will not affect the accurate positioning of the pavement sample column 3 by the positioning blocks 12. When the external threaded tube 16 is reversed, the external threaded tube 16 is screwed into the cup body 18, so that the bearing plate 15 contacts the pavement sample column 3. Similarly, the threaded plate 14 takes all the positioning blocks 12 away from the pavement sample column 3 and releases the pavement sample column 3, while not affecting the axial pressing of the bearing plate 15 on the pavement sample column 3. The structure is very clever, and finally the pavement sample column 3 is axially clamped by the sealing gasket 10 at the upper end and the bearing plate 15 at the lower end, so that the pavement sample column 3 can be tested for strength after the support plate 11 is withdrawn. The reason for withdrawing the support force of the support plate 11 is that the support plate 11 can only generate support force at the edge of the pavement sample column 3. During the strength test, it will deform and affect the strength test result. Finally, the hydraulic telescopic cylinder 17 located in the external threaded tube 16 is started to extend until it presses against the bottom end of the threaded plate 14, and finally the stamping equipment (not shown in the figure) is started to apply the rated load to the top surface of the pavement sample column 3 for strength test.

[0040] In addition, in the present embodiment, it should be particularly noted that the reason why such an additional hydraulic telescopic cylinder 17 is provided is that if the pavement sample column 3 is supported solely by the external threaded tube 16, the thread of the external threaded tube 16 is likely to be damaged, because the bearing capacity of the thread is very limited, which may be suitable for some tests with low strength, but when the strength is high, it will inevitably affect its service life and cause problems in the test, so the hydraulic telescopic cylinder 17 is needed to play a supporting role, and, in fact, as a general thread, there is actually a tiny gap between the threads of the thread pair, that is, the external threaded tube 16 has a slight up and down movement relative to the bottom of the cup body 18, and when the external threaded tube 16 lifts the pavement sample column 3 upward through the threaded disk 14 and remains stationary, at this time, due to the self-weight of the pavement sample column 3, the threaded disk 14 and the external threaded tube 16, the external threaded tube 16 is actually in a downward extreme position relative to the bottom of the cup body 18, that is, the external threaded tube 16 at this time has a slight upward movement; therefore, when the hydraulic telescopic cylinder 17 is pushed up a short distance, the pavement sample column 3 and the threaded disk 14 can be lifted and held together. 4 and the external threaded tube 16 as a whole are lifted upward by the above-mentioned upward movement, so that the bearing plate 15 and the bottom end of the threaded plate 14 are fully in contact and force transmission, while the external threaded tube 16, due to the above-mentioned characteristics of the threaded connection, the threads between it and the threaded hole at the bottom of the cup body 18 are not in an effective contact state, so that the hydraulic telescopic cylinder 17 directly bears most or even all of the load, which plays a protective role for the external threaded tube 16. At this time, the external threaded tube 16 is equivalent to being roughly or completely suspended above the ground. Moreover, the hydraulic telescopic cylinder 17 used has only a very small telescopic amount during use, so its structure is more stable and reliable. The extreme stroke can have greater bearing capacity and reliability, as well as higher transmission efficiency, which is an advantage that common long-stroke cylinders or hydraulic cylinders do not have, and is of great significance in design; and based on the details of the above-mentioned embodiment, it can be seen that for the threaded connection of the external threaded tube 16, it is not necessary to consider the thread accuracy, the manufacturing cost is low, and even the larger the matching clearance between the thread threads, the better, and a large-clearance thread can be directly selected to obtain a small and suitable extension value of the hydraulic telescopic cylinder 17.

[0041] Based on the above principle, as a special alternative embodiment, in the specific implementation, the piston column 21 in the hydraulic telescopic cylinder 17 is as follows Figure 7 The structure shown, such as Figure 6 As shown, the inner wall of the external threaded tube 16 is provided with a raised portion 22, which contacts one side of the lower end surface of the top plate 2101 of the piston column 21 to move the piston column 21 upward, so that the piston column 21 only needs to extend slightly upward to maintain effective contact and force transmission with the threaded plate 14, and the threaded connection structure between the external threaded tube 16 and the bottom of the cup body 18 can be partially or completely separated from the state of load transmission for strength testing.

[0042] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A method for detecting the quality of a road surface for a municipal road, comprising: drilling a core sample to obtain a cylindrical road surface sample column (3), and then performing a quality detection on the cylindrical road surface sample column, characterized in that: Step 1: The coring drill bit (4) used comprises a plurality of drill bars (401) in an annular array, each drill bar (401) has an arc-shaped cross section, and all the drill bars (401) can be moved closer to or farther from each other to change the diameter of the drilled road surface sample column (3); Step 2, when performing quality inspection on the pavement sample column (3), first install it vertically in a container, set a sealing gasket (10) around the top surface of the pavement sample column (3), inject dyed leakage water into the sealing gasket (10), and observe whether the leakage of the leakage water from the surface of the pavement sample column (3) meets the requirements; Step 3, applying a rated positive pressure to the pavement sample column (3), and observing whether the collapse deformation of the pavement sample column (3) meets the requirements; In step 1, the distances of all drill rods (401) are first adjusted to drill a cylindrical core (2) having the same diameter as the pavement sample column (3), and the length of the cylindrical core (2) is longer than the pavement sample column (3). After the cylindrical core (2) is drilled, an annular groove (20) is left on the outer side of the cylindrical core (2); Then, all the drill bars (401) are moved further away from each other by a distance, and this distance allows the drill bars (401) to still partially extend into the annular groove (20) when drilling, and drill vertically along the already drilled annular groove (20), so that the groove width of the annular groove (20) is further expanded, and the drilling is stopped before the bottom end of the annular groove (20) is approached. At this time, all the drill bars (401) are moved closer to each other, so as to clamp the cylindrical core body (2) in the center of the annular groove (20) and then break the cylindrical core body (2), and the core drill bit (4) is moved upward to remove the cylindrical core body (2), and the bottom section of the cylindrical core body (2) is cut and smoothed according to the set length of the pavement sample column (3) to obtain the pavement sample column (3); The top of all the drill bars (401) is provided with a connection block (5), on which a driving bar (6) perpendicular to the drill bars (401) is fixed, and the driving bar (6) is connected to a rotating disk (19) rotatably installed in a housing (7) through a plane threaded connection for transmission, and when the rotating disk (19) rotates, all the driving bars (6) are synchronously moved closer or farther away, so that the diameter of the annular drill barrel structure surrounded by all the drill bars (401) is reduced or increased; a plurality of slide grooves (701) in an annular array are provided on the bottom end surface of the housing (7), and the connection block (5) is slidably installed in the notch of each slide groove (701); an adjusting column (8) is coaxially fixed at the center of the top of the rotating disk (19), and one end of the adjusting column (8) exposed from the housing (7) is axially pressed and fixed by a fixing screw cover (9) threadedly fitted on the housing (7); The container used is a cylindrical cup body (18) placed on the ground, and a plurality of support plates (11) are provided on the side wall near the bottom of the cup body (18), and all the support plates (11) are arranged in a ring array. Positioning blocks (12) are installed on the support plates (11) to slide radially along the cup body (18), and the bottom ends of the positioning blocks (12) are connected to the threaded disk (14) located below the support plate (11) through a connecting piece (13) in a plane thread matching manner, so that when the threaded disk (14) rotates, all the positioning blocks (12) move synchronously to coaxially clamp the pavement sample column (3) in the cup body (18).

2. The method for detecting the quality of a municipal road surface according to claim 1, characterized in that: The core drill bit (4) breaks the cylindrical core body (2) by swinging left and right.

3. The method for detecting the quality of a municipal road surface according to claim 1, characterized in that: The cutting device is extended into the bottom of the enlarged annular groove (20) to completely or partially cut off the cylindrical core body (2) in the radial direction. When the cylindrical core body (2) is partially cut off, the core drill bit (4) needs to be moved down into the annular groove (20) again to clamp the cylindrical core body (2) and break it off.

4. The method for detecting road surface quality for municipal roads according to claim 1, characterized in that: A plurality of spiral cutting edges are provided on the surface of the drill rod (401).

5. The method for detecting road surface quality for municipal roads according to claim 1, characterized in that: The inner wall of the top cup opening of the cup body (18) is provided with a thread, and the bottom end of the sealing gasket (10) has a positioning sink (1001). The sealing gasket (10) is threadedly mounted in the cup opening, and the sink (1001) is sealed and fitted on the edge of the top end of the pavement sample column (3), so that when leakage water is injected into the sealing gasket (10), it does not flow out from the joint between the sealing gasket (10) and the pavement sample column (3).

6. The method for detecting the quality of a municipal road surface according to claim 5, characterized in that: An external threaded tube (16) is coaxially fixedly connected to the center of the bottom end of the threaded disk (14), and a carrier disk (15) is coaxially fixed to the center of the top end; when the external threaded tube (16) rotates forward, it is screwed outward from the cup body (18), so that the carrier disk (15) and the road sample column (3) are not in contact, and the threaded disk (14) clamps the road sample column (3) with all the positioning blocks (12); and when the external threaded tube (16) rotates reversely, it is screwed into the cup body (18), so that the carrier disk (15) and the road sample column (3) are in contact with each other. The pavement sample column (3) is contacted, and the threaded disk (14) moves away from the pavement sample column (3) with all the positioning blocks (12), thereby releasing the pavement sample column (3), and finally the pavement sample column (3) is axially clamped by the sealing gasket (10) at the upper end and the supporting disk (15) at the lower end; then, a hydraulic telescopic cylinder (17) installed on the ground and located in the external threaded tube (16) is started to extend until it contacts the bottom end of the threaded disk (14), and finally the stamping equipment is started to apply a rated load to the top end surface of the pavement sample column (3).

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