Pavement compactness detection device and method for highway construction

Abstract

The invention belongs to the field of highway engineering detection, and particularly discloses a pavement compactness detection device and method for highway construction, and the device comprises a cross rod, and a plurality of detection mechanisms are arranged on the cross rod and a connecting frame; the detection mechanism comprises a sleeve arranged on the cross rod and the connecting frame, a lifting rod is movably arranged in the sleeve, and a labeling mechanism is arranged on the lifting rod; the marking mechanism comprises a lantern ring and a first gear ring which are arranged on the lifting rod, the upper surface of the lantern ring is obliquely arranged, a plurality of movable rods are movably arranged in the lantern ring, marking pens are arranged at the bottoms of the movable rods, balls are movably arranged on the movable rods, and the balls make contact with the upper surface of the lantern ring; automatic color marking of different compaction degree grades is achieved through linkage of the lantern ring, the gear ring set and the marking pen; visualization of compaction degree distribution is achieved, constructors can conveniently and rapidly position a problem area, the construction process is optimized, and the later maintenance cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of highway engineering testing, specifically relating to a pavement compaction testing device and method for highway construction. Background Technology

[0002] Road surface compaction is a key indicator for measuring construction quality, directly affecting the road surface's load-bearing capacity and service life. Traditional testing methods (such as the ring cutter method and sand cone method) require manual sampling and on-site testing, which suffers from low testing efficiency, high labor intensity, and delayed test results. Furthermore, they cannot achieve continuous dynamic monitoring of road surface compaction, making it difficult to meet the needs of rapid construction and quality control in modern highway engineering.

[0003] Chinese patent CN114252335B discloses a real-time detection device for highway pavement compaction, comprising a base, a rotating mechanism, a support mechanism, and a detection mechanism. The rotating mechanism includes a sliding support connected to the base, with multiple rotating plates rotatably connected to the end of the sliding support away from the base, and a synchronization component between the rotating plates. The detection mechanism includes a displacement sensor located at the end of the base, with its telescopic rod connected to a guide wheel that cooperates with the rotating plate. The support mechanism, located at the end of the rotating plate away from the detection mechanism, includes a lifting component fixedly connected to the rotating plate, with a support wheel on the side of the lifting component closest to the ground. This invention relates to a real-time detection device for highway pavement compaction. The entire device can be installed in a vehicle-mounted manner, allowing for real-time detection while the vehicle is moving, thus improving detection efficiency.

[0004] However, although the aforementioned patent can achieve continuous real-time detection of the compaction degree of long-distance highway pavement, it lacks a marking mechanism and cannot mark areas with insufficient compaction during the movement of the device. After the detection is completed, it is difficult for staff to quickly locate the location of areas with insufficient compaction, requiring secondary confirmation, which increases costs and time. Summary of the Invention

[0005] The purpose of this invention is to provide a pavement compaction testing device and method for highway construction, so as to solve the problem mentioned in the background art that it is difficult for workers to quickly locate the area of ​​insufficient compaction after the test is completed by traditional pavement compaction testing devices.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A road surface compaction testing device for highway construction includes: a crossbar, with a fixed base at the front end of the crossbar via a connecting frame; several testing mechanisms are provided on both the crossbar and the connecting frame; each testing mechanism includes a sleeve mounted on the crossbar and the connecting frame, a lifting rod movably mounted inside the sleeve, a roller at the bottom of the lifting rod, a displacement sensor at the top of the lifting rod, and a marking mechanism on the lifting rod; the marking mechanism includes a collar and a toothed ring mounted on the lifting rod, the upper surface of the collar being inclined, several movable rods movably mounted inside the collar, a marking pen at the bottom of each movable rod, a spring between the top of each movable rod and the sleeve, a ball bearing movably mounted on each movable rod in contact with the upper surface of the collar, a toothed ring on the collar, and a rotary drive component at the input end of the toothed ring.

[0008] Preferably, the rotary drive component includes a lead screw mounted on a sleeve, and a threaded ring is provided on the toothed ring, the threaded ring being threadedly connected to the lead screw.

[0009] Preferably, a one-way bearing is provided between the threaded ring and the toothed ring, and a limit bracket is provided on the sleeve surrounding the movable rod.

[0010] Preferably, the first toothed ring and the second toothed ring mesh with each other, and a counterweight is provided at the top of the lifting rod.

[0011] Preferably, the detection mechanism further includes a pressure applying mechanism, which includes a gear 1 movably mounted on the sleeve, a gear 2 mounted on the gear 1, a toothed plate 1 mounted on the lifting rod, a fixed frame movably mounted between the collar and the toothed ring 1, a side plate slidably mounted on the lifting rod, a toothed plate 2 mounted at the front end of the side plate, and a spring 2 mounted between the rear end of the side plate and the fixed frame.

[0012] Preferably, a sliding groove is provided on the inner side of the side plate surrounding the lifting rod, the first toothed plate meshes with the first gear, and the second toothed plate meshes with the second gear.

[0013] Preferably, the road compaction testing device further includes a stabilizing mechanism, which includes a housing disposed at both ends of the crossbar, a roller two disposed at the bottom of the housing, the housing and the crossbar being connected by a linear drive component, and a spring three and a damper respectively disposed between the connecting frame and the fixed base.

[0014] Preferably, the linear drive includes a motor mounted on the housing, and the output end of the motor is provided with a threaded rod, which is threadedly connected to the crossbar.

[0015] Preferably, the fixed base is provided with a limiting rod, which passes through the connecting frame.

[0016] A method for testing pavement compaction degree using a road construction pavement compaction testing device includes:

[0017] S1. The detection device is softly connected to the traction vehicle through the fixed seat. The traction vehicle drives the crossbar and the detection mechanism to move at a constant speed. Roller 1 contacts the road surface. The displacement sensor collects the compaction degree in real time according to the rise and fall of roller 1 and transmits it to the central control terminal for recording.

[0018] S2. When the lifting pole descends, the bottom marker pen contacts the road surface to mark the area of ​​compaction change.

[0019] S3. The threaded ring descends with the lifting rod and drives the collar to rotate through the screw, causing the balls to slide along the inclined upper surface of the collar. Rotating the pen switches between different colors to mark the corresponding compaction grade on the road surface.

[0020] S4. The detection mechanism in front of the roller two detects the compaction of the path in advance, the central control end calculates the lifting trajectory, and adjusts the height of the crossbar in real time through the linear drive component to counteract the impact of uneven road surface.

[0021] S5. After the inspection, based on the color distribution of the road marking pens and the data from the central control terminal, locate the unqualified road sections and the trend of compaction changes.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] This invention connects the detection device to the traction vehicle and utilizes rollers, lifting rods, and displacement sensors to achieve real-time dynamic detection of road compaction. The linkage of collars, toothed rings, and marking pens enables automatic color labeling of different compaction levels. The entire system can simultaneously complete detection, data acquisition, and grading labeling, significantly improving detection efficiency and accuracy, visualizing compaction distribution, facilitating quick location of problem areas by construction personnel, optimizing construction processes, and reducing subsequent maintenance costs. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a rear view of the present invention;

[0027] Figure 3 This is a schematic diagram of the detection mechanism structure of the present invention;

[0028] Figure 4 This is a schematic diagram of the pressure application mechanism of the present invention;

[0029] Figure 5 This is a schematic diagram of the labeling mechanism of the present invention.

[0030] In the diagram: 1. Crossbar; 2. Connecting frame; 3. Fixed base; 4. Linear drive component; 401. Motor; 402. Threaded rod; 5. Sleeve; 6. Lifting rod; 7. Marking mechanism; 701. Movable rod; 702. Marking pen; 703. Lead screw; 704. Collar; 705. Gear ring one; 7051. Threaded ring; 7052. One-way bearing; 706. Gear ring two; 707. Spring one; 708 709. Limiting frame; 8001. Ball bearing; 801. Pressure applying mechanism; 802. Gear 1; 803. Gear plate 1; 804. Gear plate 2; 805. Side plate; 806. Spring 2; 807. Fixing frame; 808. Slide groove; 9. Counterweight; 10. Displacement sensor; 11. Roller 1; 12. Housing; 13. Roller 2; 14. Limiting rod; 15. Spring 3; 16. Damper. Detailed Implementation

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0034] As attached Figure 1 To be continued Figure 5 As shown:

[0035] Example 1: This example provides a road surface compaction testing device for highway construction, including: a crossbar 1, with a fixed seat 3 at the front end of the crossbar 1 via a connecting frame 2; several testing mechanisms are provided on both the crossbar 1 and the connecting frame 2; each testing mechanism includes a sleeve 5 mounted on the crossbar 1 and the connecting frame 2, a lifting rod 6 movably mounted inside the sleeve 5, a roller 11 at the bottom of the lifting rod 6, a displacement sensor 10 at the top of the lifting rod 6, and a marking mechanism 7 mounted on the lifting rod 6; the marking mechanism 7 includes a... The lifting rod 6 has a collar 704 and a toothed ring 705. The upper surface of the collar 704 is inclined. Several movable rods 701 are movably arranged inside the collar 704. A marker pen 702 is provided at the bottom of the movable rod 701. A spring 707 is provided between the top of the movable rod 701 and the sleeve 5. A ball bearing 709 is movably arranged on the movable rod 701. The ball bearing 709 is in contact with the upper surface of the collar 704. A toothed ring 706 is provided on the collar 704. A rotary drive is provided at the input end of the toothed ring 705.

[0036] During operation, the device is connected to a towing vehicle, such as a pickup truck, via a fixed base 3. The device is moved on the road surface to be tested by the towing vehicle. The lifting rod 6 moves up and down within the sleeve 5. During operation, it applies pressure to the road surface using its own weight. When the roller 11 encounters a road surface with different compaction, the sinking height is different, thus making the lifting rod 6 rise and fall synchronously within the sleeve 5. The displacement sensor 10 can be a distance sensor, used to detect the lifting distance of the lifting rod 6, so as to realize real-time detection of the road surface compaction.

[0037] When the lifting rod 6 moves downwards following the roller 11, it drives the collar 704 to move downwards synchronously. The spring 707 uses its elasticity to apply a downward thrust to the movable rod 701, ensuring that the ball bearing 709 of the movable rod 701 remains in contact with the upper surface of the collar 704. This causes the movable rod 701, along with the marking pen 702, to move downwards synchronously, bringing the marking pen 702 into contact with the road surface. As the roller 11 rolls, the marking pen 702 creates a mark on the road surface. Since multiple movable rods 701 and marking pens 702 are present, the rotation drive is activated based on the descent distance of the lifting rod 6. The rotation drive can be a servo motor, a motor, etc., utilizing the rotation drive... The moving part drives the toothed ring 705 to rotate, and through the meshing of the toothed ring 705 and the toothed ring 706, drives the collar 704 to rotate. Due to the inclined setting of the upper surface of the collar 704, the height of its contact point with the ball 709 is adjusted with the rotation of the collar 704, thereby changing the height of the movable rod 701 and the marker pen 702. The marker pen 702, which is currently at the lowest position, is lifted upward, and the adjacent marker pen 702 is moved downward to the lowest position to contact the road surface. The multiple marker pens 702 are different colors, so that after the current road surface compaction test is completed, the staff can judge the compaction status of the current road surface position by observing the color of the marker pen 702, which is convenient for subsequent maintenance and adjustment.

[0038] Specifically, gear ring 1 705 meshes with gear ring 2 706, and a counterweight 9 is provided at the top of the lifting rod 6.

[0039] The counterweight 9 ensures the pressure applied to the road surface by the roller 11.

[0040] Example 2: This example is basically the same as the previous example, except that the rotary drive includes a lead screw 703 disposed on the sleeve 5, and a threaded ring 7051 disposed on the toothed ring 705, which is threadedly connected to the lead screw 703.

[0041] Specifically, a one-way bearing 7052 is provided between the threaded ring 7051 and the toothed ring 705, and a limit bracket 708 is provided on the sleeve 5 surrounding the movable rod 701.

[0042] As can be seen from the above, when the lifting rod 6 drives the toothed ring 705 and the collar 704 to move downward, it will drive the threaded ring 7051 to move synchronously. Since the lead screw 703 is fixedly set, the threaded ring 7051 will drive the toothed ring 705 to rotate through the threaded connection with the lead screw 703, and then drive the collar 704 to rotate through the meshing of the toothed ring 705 and the toothed ring 706.

[0043] When the lifting rod 6 moves the toothed ring 705 upward, it drives the threaded ring 7051 to rotate in the opposite direction through the threaded connection between the lead screw 703 and the threaded ring 7051. Due to the one-way bearing 7052, the threaded ring 7051 can only drive the toothed ring 705 to rotate in one direction. Therefore, when the threaded ring 7051 rotates in the opposite direction, it will not drive the toothed ring 705 to rotate synchronously. Consequently, the position of the marker pen 702 will not be reset when the lifting rod 6 rises. The selection of the marker pen 702 will only be adjusted linearly in one direction. This allows for easy judgment of compaction changes by using the color of the marker pens 702 corresponding to the adjacent markings on the road surface in the direction of rotation. The marker pens 702 are also evenly distributed to avoid excessive wear on any one marker pen 702. The marker pen 702 can be a charcoal pencil or a pigment pen with a ballpoint pen tip structure.

[0044] Example 3: This example is basically the same as the previous example, except that the detection mechanism also includes a pressure mechanism 8. The pressure mechanism 8 includes a gear 801 movably mounted on the sleeve 5, a gear 802 mounted on the gear 801, a toothed plate 803 mounted on the lifting rod 6, a fixed frame 807 movably mounted between the collar 704 and the toothed ring 705, a side plate 805 slidably mounted on the lifting rod 6, a toothed plate 804 mounted at the front end of the side plate 805, and a spring 806 mounted between the rear end of the side plate 805 and the fixed frame 807.

[0045] When the toothed plate 804 moves, it will drive the collar 704 and the toothed ring 705 to move synchronously.

[0046] Specifically, a sliding groove 808 is provided on the inner side of the side plate 805 of the outer periphery of the lifting rod 6, the toothed plate 803 meshes with the gear 801, and the toothed plate 804 meshes with the gear 802.

[0047] The side plate 805 moves on the lifting rod 6 via the slide groove 808, which limits the position of the side plate 805 so that it can only move up and down.

[0048] In the initial state, the lowest point of the marker pen 702 is still a certain distance above the road surface. When the roller 11 and the lifting rod 6 move downward, it will drive the toothed plate 803 to move, which in turn drives the gear 801 to rotate. The gear 801 is coaxially connected with the gear 2 802, which in turn drives the toothed plate 804 to move downward. Since the diameter of the gear 2 802 is larger than that of the gear 1 801, the moving speed of the toothed plate 804 is faster than that of the toothed plate 803. As a result, the collar 704 and the toothed ring 705 descend faster than the lifting rod 6, so that the marker pen 702 makes pre-contact with the road surface for marking. The elastic pressure accumulated by the spring 2 806 presses the marker pen 702 onto the road surface to ensure contact stability and improve marking accuracy. When the roller 11 moves upward to the initial position, the marker pen 702 will also return to the initial position and separate from the road surface, avoiding invalid marking and reducing wear on the marker pen 702.

[0049] Example 4: This example is basically the same as the previous example, except that the road compaction detection device also includes a stabilizing mechanism. The stabilizing mechanism includes a housing 12 set at both ends of the crossbar 1. A roller 13 is set at the bottom of the housing 12. The housing 12 and the crossbar 1 are connected by a linear drive 4. A spring 15 and a damper 16 are respectively set between the connecting frame 2 and the fixed seat 3.

[0050] The linear drive 4 can be a hydraulic push rod or a pneumatic push rod, used to control the relative position of the crossbar 1 and the housing 12.

[0051] Specifically, the linear drive component 4 includes a motor 401 mounted on the housing 12, and the output end of the motor 401 is provided with a threaded rod 402, which is threadedly connected to the crossbar 1.

[0052] Specifically, a limit rod 14 is provided on the fixed base 3, and the limit rod 14 passes through the connecting frame 2.

[0053] When the traction vehicle drives the device, the roller 13 supports the crossbar 1 and rolls on the ground. The spring 15 and the damper 16 then make the traction vehicle and the device softly connected, so as to avoid the bumps caused by different road compaction during the traction vehicle's movement being transmitted to the crossbar 1 and affecting the stability of the crossbar 1. This ensures that the crossbar 1 is always in the current position, improving the accuracy of compaction detection.

[0054] A detection mechanism is also installed on the crossbar 1 in front of roller 2 13 to detect the compaction of the road surface in front of roller 2 13. While increasing the detection range, the detection mechanism transmits the detected compaction data to the central control terminal on the traction vehicle. The lifting trajectory of roller 11 of the detection mechanism is calculated based on the compaction change. This movement trajectory is the same as the lifting trajectory of roller 2 13 when it moves to this position. Then, when roller 2 13 moves to this position, motor 401 is started. Motor 401 drives threaded rod 402 to rotate. Then, through the threaded connection between threaded rod 402 and crossbar 1, the crossbar 1 is driven to rise and fall. This avoids the lifting and falling of housing 12 from affecting the stability of crossbar 1, ensuring that crossbar 1 is always at the current height, and further improving the accuracy of subsequent compaction detection.

[0055] Example 5: This example provides a testing method for a road surface compaction testing device used in highway construction, including:

[0056] S1. The detection device is softly connected to the traction vehicle through the fixed seat 3. The traction vehicle drives the crossbar 1 and the detection mechanism to move at a constant speed. The roller 11 contacts the road surface. The displacement sensor 10 collects the compaction degree in real time according to the rise and fall of the roller 11 and transmits it to the central control terminal for recording.

[0057] S2. When the lifting rod 6 descends, the bottom marker pen 702 contacts the road surface to mark the area of ​​compaction change.

[0058] S3. The threaded ring 7051 descends with the lifting rod 6 and drives the collar 704 to rotate through the screw 703, so that the ball 709 slides along the inclined upper surface of the collar 704. The rotating pen 702 switches between different colors to mark the corresponding compaction level on the road surface.

[0059] S4, the detection mechanism in front of roller 13 detects the compaction of the path in advance, the central control end calculates the lifting trajectory, and adjusts the height of the crossbar 1 in real time through the linear drive component 4 to offset the impact of uneven road surface;

[0060] S5. After the test, based on the color distribution of the 702 road marking pen and the data from the central control terminal, locate the unqualified road sections and the trend of compaction changes.

[0061] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0062] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the invention as currently considered, or those features that are not relevant to implementing the invention) may be omitted.

[0063] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0064] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A pavement compaction testing device for highway construction, characterized in that, Include: Crossbar (1), the front end of the crossbar (1) is provided with a fixed seat (3) through a connecting frame (2), the crossbar (1) and connecting frame (2) are provided with a plurality of detection mechanisms; The detection mechanism includes a sleeve (5) provided on the crossbar (1) and the connecting frame (2), a lifting rod (6) movably arranged in the sleeve (5), a displacement sensor (10) arranged at the top of the lifting rod (6), and a marking mechanism (7) arranged on the lifting rod (6); The marking mechanism (7) includes a sleeve ring (704) and a gear ring (705) arranged on the lifting rod (6), the upper surface of the sleeve ring (704) is arranged obliquely, a plurality of movable rods (701) are movably arranged in the sleeve ring (704), a marker pen (702) is arranged at the bottom of the movable rod (701), a spring (707) is arranged between the top of the movable rod (701) and the sleeve (5), a ball (709) is movably arranged on the movable rod (701), the ball (709) is in contact with the upper surface of the sleeve ring (704), a gear ring (706) is arranged on the sleeve ring (704), and a rotary drive is arranged on the input end of the gear ring (705).

2. The road surface compactness detection device for road construction according to claim 1, characterized by The rotary drive includes a lead screw (703) arranged on the sleeve (5), a threaded ring (7051) is arranged on the gear ring (705), and the threaded ring (7051) is threadedly connected with the lead screw (703).

3. The road surface compactness detection device for road construction according to claim 2, characterized by A one-way bearing (7052) is arranged between the threaded ring (7051) and the gear ring (705), and a limiting frame (708) is arranged on the sleeve (5) surrounding the movable rod (701).

4. The road surface compactness detection device for road construction according to claim 1, characterized by The gear ring (705) is engaged with the gear ring (706), and a counterweight (9) is arranged at the top of the lifting rod (6).

5. The road surface compactness detection device for road construction according to claim 1, characterized by The detection mechanism further includes a pressure applying mechanism (8), the pressure applying mechanism (8) includes a gear one (801) movably arranged on the sleeve (5), a gear two (802) is arranged on the gear one (801), a toothed plate one (803) is arranged on the lifting rod (6), a fixed frame (807) is movably arranged between the sleeve ring (704) and the gear ring (705), a side plate (805) is slidably arranged on the lifting rod (6), a toothed plate two (804) is arranged at the front end of the side plate (805), and a spring two (806) is arranged between the rear end of the side plate (805) and the fixed frame (807).

6. The road surface compactness detection device for road construction according to claim 5, wherein A sliding groove (808) is arranged on the inner side of the side plate (805) surrounding the lifting rod (6), the toothed plate one (803) is engaged with the gear one (801), and the toothed plate two (804) is engaged with the gear two (802).

7. The road surface compactness detection device for road construction according to claim 1, characterized by The road surface compactness detection device further comprises a stabilizing mechanism, the stabilizing mechanism comprises housings (12) arranged at both ends of the cross bar (1), the housings (12) are provided with rollers two (13) at the bottom, the housings (12) and the cross bar (1) are connected through linear drives (4), and the connecting frames (2) and the fixed seats (3) are respectively provided with springs three (15) and dampers (16).

8. The road surface compactness detection device for road construction according to claim 7, characterized by The linear drive (4) comprises a motor (401) arranged on the housing (12), the output end of the motor (401) is provided with a threaded rod (402), and the threaded rod (402) is threadedly connected with the cross bar (1).

9. The road surface compactness detection device for road construction according to claim 1, characterized by The fixed seat (3) is provided with a limiting rod (14), and the limiting rod (14) penetrates through the connecting frame (2).

10. The method of claim 1-9, wherein the method is characterized by, Comprise: S1, the detection device is connected with the towing vehicle through the fixed seat (3), the towing vehicle drives the cross bar (1) and the detection mechanism to move uniformly, the roller one (11) contacts the road surface, the displacement sensor (10) collects the compactness in real time according to the lifting of the roller one (11) and transmits to the central control end record; S2, when the lifting rod (6) is lowered, the bottom marker pen (702) contacts the road surface, and the marking of the compactness change area is realized. S3, the threaded ring (7051) is lowered along with the lifting rod (6), the sleeve ring (704) is driven to rotate through the lead screw (703), the ball (709) slides along the inclined upper surface of the sleeve ring (704), the different color marker pens (702) are switched, and the corresponding compactness grade is marked on the road surface; S4, the detection mechanism in front of the roller two (13) detects the compactness of the path in advance, the central control end calculates the lifting track, the height of the cross bar (1) is adjusted in real time through the linear drive (4), and the influence of the uneven road surface is offset; S5, after detection, according to the color distribution of the road marker pen (702) and the data of the central control end, the unqualified road section and the compactness change trend are positioned.

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