Rural highway subgrade detection system

Abstract

The invention belongs to the technical field of inspection and detection, and discloses a rural highway subgrade detection system, which comprises a sampling module, a detection module and a reporting module, the sampling module comprises a supporting seat, a lifting platform and a driving unit used for driving the lifting platform are installed on the supporting seat, a motor is arranged on the lifting platform, the shaft end of the motor is connected with an elastic base, a drilling barrel is installed on the elastic base and can float up and down, and a blade part is arranged at the bottom of the drilling barrel. According to the rural highway subgrade detection system provided by the invention, the drill cylinder is mounted on the elastic base and can float up and down, the drill cylinder can float up and down to compress the elastic base when encountering a hard object, a buffering effect on the blade part is achieved, meanwhile, due to the up-down floating of the drill cylinder, a motion form similar to a percussion drill can be formed, and the downward cutting speed is increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of inspection and testing, and particularly relates to a rural road subgrade detection system. Background Art

[0002] In the construction of rural roads, the subgrade is an important part of the road and provides the necessary conditions for the pavement laying. Therefore, subgrade detection is required. Subgrade detection needs to take samples on-site and then measure the compressive strength, flexural strength, stability, etc. of the subgrade samples to ensure that the road can withstand the action of vehicle loads and other loads during actual use and avoid damage. Due to the limitations of rural construction conditions, most of the existing sampling devices have simple structures and low drilling efficiency. After successful sampling, the subgrade filling is in the drill barrel, and it is not convenient to take out the sample from the drill barrel, which is time-consuming and laborious.

[0003] The above statement of the background art is only for the convenience of deeply understanding the technical solution of the present invention (such as the technical means used, the technical problems solved, and the technical effects produced, etc.), and should not be regarded as an admission or an indication in any form that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0004] The present invention aims to solve the above technical problems at least to a certain extent. For this reason, the object of the present invention is to provide a rural road subgrade detection system.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A rural road subgrade detection system includes:

[0007] A sampling module for sampling the subgrade layer; the sampling module includes a support base, on which a lifting platform and a driving unit for driving the lifting platform are installed. A motor is provided on the lifting platform, and the shaft end of the motor is connected to an elastic base. The drill barrel is installed on the elastic base and can float up and down, and a cutting edge is provided at the bottom of the drill barrel.

[0008] A detection module for detecting the subgrade layer after sampling;

[0009] A reporting module for obtaining the detection data of the detection module and generating a detection report in combination with the subgrade knowledge base; the reporting module includes a Beidou positioning unit and a LoRa communication unit.

[0010] Preferably, the elastic base includes a bottom plate, a contact ring disposed on the bottom plate, and a disc spring assembly disposed on the bottom plate. The disc spring assembly is disposed within the contact ring and includes a first disc spring and a second disc spring arranged facing each other. One end of the first disc spring is fixedly connected to the bottom plate, the other end of the first disc spring is connected to one end of the second disc spring, and the other end of the second disc spring is connected to the top of the drill pipe. A guiding and bearing cylinder is provided at the top of the drill pipe, and the outer wall of the contact ring is slidably connected to the inner wall of the guiding and bearing cylinder.

[0011] Preferably, a limiting ring is convexly provided inside the drill pipe. A plurality of floating grippers capable of moving along the radial direction of the drill pipe are circumferentially and uniformly arranged on the inner wall of the drill pipe above the limiting ring. An elastic member is provided between the outer side of the floating gripper and the drill pipe. At least one groove is vertically provided on the inner wall of the limiting ring. The lower end of the limiting ring is connected to the inner wall of the drill pipe through an inclined surface transition connection.

[0012] Preferably, two guiding rods are vertically provided on the support base, and the lifting platform is slidably mounted on the guiding rods. The shaft end of the motor is connected to the elastic base through a drill rod. The cutting edge is a circle of cutting teeth provided at the bottom of the drill pipe.

[0013] The beneficial effects of the present invention are as follows:

[0014] The rural road subgrade detection system provided by the present invention can achieve full-process detection through the sampling module for rapid sampling, the detection module for real-time detection, and the report module for automatically generating a standardized report, and is particularly suitable for long-distance multi-point detection scenarios in rural areas.

[0015] Meanwhile, the drill pipe of the sampling module is mounted on the elastic base and can float up and down. When encountering a hard object, it can float up and down to compress the elastic base, playing a buffering role for the cutting edge. At the same time, due to the up and down floating of the drill pipe, a movement form similar to that of a percussion drill can be formed, accelerating the downward cutting speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic block diagram of the rural road subgrade detection system of the present invention.

[0017] Figure 2 is a schematic diagram of the sampling module of the present invention.

[0018] Figure 3 is a partial structural cross-sectional view of the sampling module of the present invention.

[0019] Figure 4 is a partial structural cross-sectional view of the drill pipe of the present invention.

[0020] In the figure: 1 - support base; 2 - lifting platform; 3 - motor; 4 - elastic base; 5 - drill barrel; 6 - cutting edge; 7 - bottom plate; 8 - contact ring; 9 - first butterfly spring; 10 - second butterfly spring; 11 - guiding and load-bearing cylinder; 12 - limiting ring; 13 - floating gripper plate; 14 - elastic member; 15 - strip-shaped blind hole; 16 - guiding rod; 17 - drill pipe. Detailed implementation manners

[0021] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described by referring to the drawings here are exemplary and are intended to explain the present invention, but should not be construed as a limitation to the present invention. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] In the present invention, unless otherwise clearly specified and defined, terms such as "installation", "connection", "coupling" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements.

[0023] As Figure 1 shown, a rural road subgrade detection system in this embodiment includes a sampling module, a detection module and a reporting module. The sampling module is used to sample the road subgrade layer, and the detection module is used to detect the sampled road subgrade layer. The detection module includes a dielectric constant sensor (0.1% resolution), a laser densitometer (0.5 mm accuracy), a micro penetrometer (0.01 kN), etc., and can synchronously obtain 12 parameters such as moisture content (±0.3%), degree of compaction (±0.5%) and bearing capacity (±2 kPa). Compared with the single-index detection of the traditional core cutter method and laboratory analysis, the data dimension increases by 400%, and the on-site detection error is reduced by 65%. The reporting module includes a Beidou positioning unit and a LoRa communication unit, which can automatically integrate the detection data of the detection module, realize the real-time transmission and communication of the detection data, and combine with the subgrade knowledge base to generate a structured report on-site, supporting the road condition assessment and maintenance planning based on the data; this rural road subgrade detection system has a speed increase of 10 - 20 times compared with the traditional manual judgment, and the misjudgment rate is reduced from 15% to 3%, which is especially suitable for the current situation of lacking professional detection personnel in rural areas.

[0024] As Figure 2 、 Figure 3 and Figure 4As shown in the figure, the sampling module includes a support base 1, a lifting platform 2, a driving unit, a motor 3, an elastic base 4, and a drill barrel 5. Two guide rods 16 are vertically provided on the support base 1. The lifting platform 2 is slidably mounted on the guide rods 16 and can slide up and down along the guide rods 16. A driving unit (not shown in the figure) for driving the lifting platform 2 is installed on the support base 1. The driving unit can adopt an electric cylinder.

[0025] The motor 3 is fixedly installed on the lifting platform 2. The shaft end of the motor 3 is connected to the elastic base 4 through a drill rod 17. A guide hole is provided on the support base 1. The drill rod 17 passes through the guide hole. The diameter of the guide hole is equal to or slightly larger than the diameter of the drill rod 17.

[0026] The drill barrel 5 is installed on the elastic base 4, and the drill barrel 5 can float up and down on the elastic base 4. A cutting edge 6 is provided at the bottom of the drill barrel 5. The cutting edge 6 is a circle of cutting teeth provided at the bottom of the drill barrel 5.

[0027] When the sampling module works, after cleaning the surface of the subgrade to be sampled, place the support base 1 horizontally on the surface of the subgrade to be sampled. Turn on the motor 3. The motor 3 drives the elastic base 4 and the drill barrel 5 to rotate. Then the driving unit slowly drives the lifting platform 2 to descend. The lifting platform 2 drives the motor 3, the base 4, and the drill barrel 5 to descend synchronously. The cutting edge 6 contacts the surface of the subgrade and continues to move downward. During this process, the cutting edge 6 cuts out a round hole in the subgrade layer, and the subgrade layer in the round hole enters the drill barrel 5 and is collected. When the cutting edge 6 moves downward, if it encounters a subgrade layer with a high degree of compaction or a hard object, the elastic base 4 will be greatly compressed, and the drill barrel 5 will move upward relative to the elastic base 4, playing a buffering role for the cutting edge 6 to avoid the cutting edge 6 from breaking. When the cutting edge 6 cuts off this part of the subgrade layer or the hard object, under the action of the restoring force of the elastic base 4, it will push the drill barrel 5 downward, forming a movement form similar to that of an impact drill and accelerating the downward cutting speed.

[0028] As Figure 3 shown, in this embodiment, the elastic base 4 includes a bottom plate 7, a contact ring 8, and a disc spring assembly. The contact ring 8 and the disc spring assembly are both installed on the lower surface of the bottom plate 7, and the disc spring assembly is arranged inside the contact ring 8. The disc spring assembly includes a first disc spring 9 and a second disc spring 10 arranged oppositely. One end of the first disc spring 9 is fixedly connected to the bottom plate 7, the other end of the first disc spring 9 is connected to one end of the second disc spring 10, and the other end of the second disc spring 10 is connected to the top of the drill barrel 5. A guide bearing cylinder 11 is provided at the top of the drill barrel 5. The outer wall of the contact ring 8 is slidably connected to the inner wall of the guide bearing cylinder 11. The cooperation between the guide bearing cylinder 11 and the contact ring 8 enables the drill barrel 5 to move only up and down along the axis.

[0029] When the disc spring assembly is not compressed, the lower end of the second disc spring 10 protrudes below the lower end of the contact ring 8, and the distance between the lower end of the contact ring 8 and the top of the drill barrel 5 is equal to the distance between the upper end of the guiding and load-bearing barrel 11 and the lower surface of the bottom plate 7.

[0030] Since the disc spring is a spring with non-linear characteristics, there is a certain non-linear relationship between its elastic deformation and the external force. When the external force is applied to a certain extent, the disc spring shows the phenomenon of instantaneous deformation. Therefore, when the drill barrel 5 is under pressure, if the pressure is not large, the disc spring assembly will not be compressed. When the drill barrel 5 encounters a slightly hard object, the pressure on the drill barrel 5 increases, and the disc spring assembly will be slightly compressed. At this time, the guiding and load-bearing barrel 11 moves upward along the contact ring 8. When the drill barrel 5 encounters a very hard object, the pressure on the drill barrel 5 further increases, and the disc spring assembly is further compressed until the lower end of the contact ring 8 contacts the top of the drill barrel 5, and at the same time, the upper end of the guiding and load-bearing barrel 11 contacts the lower surface of the bottom plate 7. The disc spring assembly will not be further compressed to prevent damage caused by continuous compression of the disc spring assembly. At this time, the pressure on the drill barrel 5 is completely transmitted to the bottom plate 7 through the disc spring assembly, the contact ring 8 and the guiding and load-bearing barrel 11. The drill barrel 5 and the bottom plate 7 are similar to hard contact, and continue to cut the hard object under the push of the driving unit.

[0031] To prevent damage to the driving unit and the cutting edge 6, when the operator observes that the upper end of the guiding and load-bearing barrel 11 contacts the lower surface of the bottom plate 7, it means that a hard object is encountered in the cutting direction. If the upper end of the guiding and load-bearing barrel 11 has not separated from the lower surface of the bottom plate 7 within the specified time, the driving unit and the motor 3 need to be stopped and the sampling position needs to be changed. In this embodiment, at least one pressure sensor is provided on the lower surface of the bottom plate 7, and the pressure sensor is disposed opposite to the upper end of the guiding and load-bearing barrel 11. When the upper end of the guiding and load-bearing barrel 11 contacts the lower surface of the bottom plate 7, the pressure sensor will be contacted. When the pressure collected by the pressure sensor operates the preset pressure, an alarm is issued.

[0032] A limiting ring 12 protrudes inside the drill barrel 5. The inner diameter of the limiting ring 12 is smaller than the inner diameter of the drill barrel 5. The lower end of the limiting ring 12 is connected to the inner wall of the drill barrel 5 through an inclined surface. During the process of the cutting edge 6 cutting the road base layer and moving downward, the cylindrical road base layer cut out will enter the drill barrel 5 through the limiting ring 12, and the inclined surface is more convenient for the road base layer to enter.

[0033] A plurality of floating grippers 13 that can only move radially along the drill barrel 5 are circumferentially and uniformly distributed on the inner wall of the drill barrel 5 above the limiting ring 12. In this embodiment, a plurality of strip-shaped blind holes 15 are circumferentially and uniformly distributed on the inner wall of the drill barrel 5. Each strip-shaped blind hole 15 is provided with a floating gripper 13. An elastic member 14 is provided between the outer side of the floating gripper 13 and the strip-shaped blind hole 15 of the drill barrel 5. The elastic member 14 provides a thrust force to the floating gripper 13, such asFigure 4 As shown, the shape design of the floating gripper plate 13 should ensure that the floating gripper plate 13 will not be ejected from the strip-shaped blind hole 15 nor be completely pressed into the strip-shaped blind hole 15.

[0034] As Figure 4 Shown is the initial state of the floating gripper plate 13. At this time, the inner sides of all the floating gripper plates 13 surround a circle, and the diameter of this circle is equal to or slightly smaller than the diameter of the limit ring 12. The floating gripper plate 13 is made of metal and has a certain weight itself. When the drill barrel 5 rotates and moves downward for sampling, under the action of centrifugal force, the floating gripper plate 13 will compress the elastic member 14, so that the circle surrounded by the inner sides of the floating gripper plates 13 is not smaller than the diameter of the limit ring 12, thus facilitating the entry of the cylindrical road base layer. Until after cutting is completed, the motor 3 stops, and the elastic member 14 pushes the floating gripper plate 13 to reset, pressing against the cylindrical road base layer. Thus, when the drive unit drives the drill barrel 5 to rise, the cylindrical road base layer will be taken out by the drill barrel 5 and will not fall off. When the drill barrel 5 is completely separated from the roadbed surface by a certain distance, place the sampling box below the drill barrel 5 and separately turn on the motor 3 so that the motor 3 rotates at a faster speed than during cutting. Under the action of a greater centrifugal force, at this time the elastic member 14 is further compressed, making the diameter of the circle surrounded by the inner sides of the floating gripper plates 13 larger than the diameter of the cylindrical road base layer, so that the floating gripper plate 13 leaves the surface of the cylindrical road base layer, and the cylindrical road base layer falls from the drill barrel 5 into the sampling box under the action of gravity. During this process, since the road base layer is compacted, the cylindrical road base layer generally will not disintegrate inside the drill barrel 5. If the cylindrical road base layer disintegrates during rotation, the disintegrated road base layer will also fall into the sampling box along the drill barrel 5.

[0035] At least one vertical groove is provided on the inner wall of the limit ring 12 for discharging the excess air in the drill barrel 5 after the road base layer enters the drill barrel 5.

[0036] The present invention is not limited to the above optional embodiments. Anyone can obtain various other forms of products under the inspiration of the present invention. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the present invention, they all fall within the protection scope of the present invention.

Claims

1. A rural highway roadbed detection system, characterized in that: include: The sampling module is used for sampling a roadbed; the sampling module comprises a support seat (1), a lifting platform (2) and a driving unit for driving the lifting platform (2) are mounted on the support seat (1), a motor (3) is arranged on the lifting platform (2), the shaft end of the motor (3) is connected to an elastic base (4), a drill tube (5) is mounted on the elastic base (4) and can float up and down, and a blade (6) is arranged at the bottom of the drill tube (5). A detection module, used for detecting the road base after sampling; The reporting module is used to obtain the detection data of the detection module and generate a detection report in combination with the roadbed knowledge base; the reporting module includes a Beidou positioning unit and a LoRa communication unit.

2. The rural highway subgrade detection system according to claim 1, characterized in that: The elastic base (4) comprises a bottom plate (7), a contact ring (8) arranged on the bottom plate (7), and a disc spring assembly arranged on the bottom plate (7); the disc spring assembly is arranged in the contact ring (8); the disc spring assembly comprises a first disc spring (9) and a second disc spring (10) arranged opposite to each other; one end of the first disc spring (9) is fixedly connected to the bottom plate (7); the other end of the first disc spring (9) is connected to one end of the second disc spring (10); and the other end of the second disc spring (10) is connected to the top of the drill tube (5).

3. The rural highway subgrade detection system according to claim 2 is characterized in that: A guide bearing cylinder (11) is provided at the top of the drill tube (5), and the outer wall of the contact ring (8) is slidably connected to the inner wall of the guide bearing cylinder (11).

4. The rural highway subgrade detection system according to claim 1, characterized in that: A circle of limiting ring (12) is protrudingly provided inside the drill tube (5); a plurality of floating gripping plates (13) capable of moving in the radial direction of the drill tube (5) are evenly distributed on the circumference of the inner wall of the drill tube (5) above the limiting ring (12); and an elastic member (14) is provided between the outer side of the floating gripping plates (13) and the drill tube (5).

5. The rural highway subgrade detection system according to claim 4 is characterized in that: At least one groove is vertically arranged on the inner wall of the limiting ring (12).

6. The rural highway subgrade detection system according to claim 4, characterized in that: The lower end of the limiting ring (12) is connected to the inner wall of the drill tube (5) via an inclined transition.

7. The rural highway subgrade detection system according to claim 1, characterized in that: Two guide rods (16) are vertically arranged on the support seat (1), and the lifting platform (2) is slidably mounted on the guide rods (16).

8. The rural highway subgrade detection system according to claim 1, characterized in that: The shaft end of the motor (3) is connected to the elastic base (4) via a drill rod (17).

9. The rural highway subgrade detection system according to claim 1, characterized in that: The blade portion (6) is a circle of blade teeth arranged at the bottom of the drill tube (5).

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