Detection device for roadbed bearing capacity

Abstract

The utility model relates to the technical field of roadbed bearing capacity detection, in particular to a roadbed bearing capacity detection device, which comprises a dynamic penetrometer, a movable frame body in vertical sliding fit with the dynamic penetrometer, a deflector rod mechanism arranged on the movable frame body, and a lifting mechanism detachably arranged on the dynamic penetrometer, the lifting mechanism is matched with a drop hammer of the dynamic penetrometer to lift the drop hammer, and the driving lever mechanism is matched with a sounding rod of the dynamic penetrometer to pull out the sounding rod; a detachable lifting mechanism is arranged, and a drop hammer of the dynamic penetrometer can be conveniently lifted through cooperation of a second motor, a rotating plate and a stop lever; the second motor drives the rotating plate to rotate, and the rotating plate can lift the stop lever to lift the drop hammer, so that compared with manual operation, the labor intensity is reduced, and the detection efficiency is improved; compared with a traditional mechanical lifting mode, the lifting mechanism is simple in structure and low in cost, is not limited by complex site conditions too much, can operate stably in various environments, and guarantees the overall measurement efficiency.

Description

Technical Field

[0001] This utility model relates to the field of roadbed bearing capacity testing technology, specifically to a testing device for roadbed bearing capacity. Background Technology

[0002] In the field of roadbed bearing capacity testing, commonly used methods include static load tests, dynamic penetration tests, and standard penetration tests. Among these, the dynamic penetration test utilizes a drop hammer of a specific mass, allowing it to fall freely from a predetermined height. This generates impact energy, propelling a probe of a specific size into the roadbed soil. By analyzing the ease with which the probe penetrates (i.e., the penetration depth), the properties and bearing capacity of the roadbed soil are determined.

[0003] Currently, there are two main methods for lifting the drop hammer: manual and mechanical (such as hydraulic presses). Manual lifting is labor-intensive and has low testing efficiency. While mechanical lifting can improve efficiency, it requires specialized equipment, resulting in high purchase and maintenance costs. Furthermore, its use is limited in certain complex site conditions, impacting overall measurement efficiency. In addition, after the test is completed, it is difficult to pull the probe of the dynamic penetrometer out of the subgrade soil, further reducing measurement efficiency. These issues urgently need to be addressed in practical engineering applications. Utility Model Content

[0004] The purpose of this invention is to provide a testing device for roadbed bearing capacity, which solves the problems mentioned in the background art of the inconvenience of raising the drop hammer and pulling out the probe rod.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a device for detecting the bearing capacity of roadbeds, comprising a dynamic cone penetrometer, a movable frame that slides vertically with the dynamic cone penetrometer, and a lever mechanism mounted on the movable frame and a lifting mechanism detachably mounted on the dynamic cone penetrometer; the lifting mechanism cooperates with the falling hammer of the dynamic cone penetrometer to lift the falling hammer, and the lever mechanism cooperates with the probe rod of the dynamic cone penetrometer to pull out the probe rod.

[0006] Furthermore, the mobile frame includes a base plate and support legs located at the bottom of the base plate; the base plate has an opening in the middle, the support legs are provided with guide plates, the guide plates are vertically slidingly engaged with the probe rod of the power penetrometer, and the bottom of the support legs is provided with casters.

[0007] Furthermore, the lever mechanism includes a first motor mounted on the base plate and vertical plates mounted on both sides of the upper part of the base plate; the output shaft of the first motor is connected to a lead screw, and the two vertical plates are slidably connected to a stop, with the lead screw and the stop being threadedly engaged.

[0008] Furthermore, the lifting mechanism includes an L-shaped plate detachably connected to the guide rod of the power penetrometer and a second motor mounted on the L-shaped plate; a rotating plate is connected to the output shaft of the second motor, and a stop bar is detachably connected to the falling hammer of the power penetrometer.

[0009] Furthermore, a positioning plate is hinged to the outrigger above the caster wheel.

[0010] Furthermore, the baffle consists of a C-shaped frame that slides vertically with the two vertical plates and baffles hinged to opposite ends of the C-shaped frame.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. This utility model features a detachable lifting mechanism. Through the cooperation of a second motor, a rotating plate, and a stop bar, the falling hammer of the power penetrometer can be easily lifted. The second motor drives the rotating plate to rotate, and the rotating plate can lift the stop bar to raise the falling hammer. Compared with manual operation, this reduces labor intensity and improves detection efficiency. Compared with traditional mechanical lifting methods, this lifting mechanism has a simple structure, low cost, and is not overly restricted by complex site conditions. It can operate stably in various environments, ensuring overall measurement efficiency.

[0013] 2. This utility model is equipped with a lever mechanism. The first motor drives the lead screw to rotate, which in turn moves the stop frame up and down. The stop frame consists of a C-shaped frame and a baffle. After the measurement is completed, the baffle is rotated so that its ends are aligned and positioned. When the stop frame moves up, the end of the baffle can abut against the protrusion at the upper end of the probe rod, thereby pulling the probe rod out of the foundation. The pulling operation is simple and quick, solving the problem of difficult probe rod pulling out, reducing the detection time, and improving work efficiency.

[0014] 3. The casters at the bottom of the mobile frame have a self-locking function, which facilitates the movement of the device in the testing area. Once the device reaches the designated position, the casters can be quickly locked to prevent displacement during the testing process. The positioning plates hinged on the outriggers further enhance the stability of the device. The positioning holes on the positioning plates can be screwed into with screws or ground anchors to fix the device to the ground, avoiding testing errors caused by external forces or vibrations and ensuring the accuracy of the testing data. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the present invention;

[0016] Figure 2 This is a rear view of the present invention;

[0017] Figure 3 An enlarged view of A is provided for this utility model.

[0018] Figure 4 This is an enlarged view of the present invention, shown in Figure B.

[0019] In the picture:

[0020] 1. Base plate; 2. Support legs; 3. Guide plate; 4. Casters; 5. First motor; 6. Vertical plate; 7. Lead screw; 8. Bracket; 9. L-shaped plate; 10. Second motor; 11. Rotating plate; 12. Stop bar; 13. Positioning plate; 14. C-shaped frame; 15. Baffle. Detailed Implementation

[0021] Please see Figures 1 to 4 A device for detecting the bearing capacity of roadbeds comprises a dynamic cone penetrometer, a movable frame that slides vertically with the dynamic cone penetrometer, a lever mechanism mounted on the movable frame, and a lifting mechanism detachably mounted on the dynamic cone penetrometer. The dynamic cone penetrometer typically consists of several key components, including a drop hammer, a guide rod, a probe, and a penetrometer rod. The probe is connected to the bottom of the penetrometer rod, the guide rod is connected to the top of the penetrometer rod, and the drop hammer slides with the guide rod. A hammer pad is placed between the drop hammer and the penetrometer rod to buffer and evenly transmit the impact force, preventing direct impact damage to the penetrometer rod and allowing the impact force to be more effectively transmitted to the probe. The penetrometer rod is generally a hollow steel pipe to facilitate the installation of sensors and wires. The lifting mechanism in this device is used to lift the drop hammer of the dynamic cone penetrometer, and the lever mechanism works with the penetrometer rod to pull out the penetrometer rod, thereby reducing operational difficulty and improving work efficiency.

[0022] The mobile frame used to move the device consists of a base plate 1 and four support legs 2 located at the bottom of the base plate 1. An opening is also provided in the center of the base plate 1 to facilitate the movement of the powered penetrometer. Guide plates 3 are mounted on the support legs 2 and slide vertically with the probe rod of the powered penetrometer to increase stability during testing. To prevent the guide plates 3 from obstructing the movement of the probe rod, the surfaces of the guide plates 3 and the probe rod can be polished or lubricated to reduce friction. A caster wheel 4 with a self-locking function is provided at the bottom of the support legs 2. A positioning plate 13 is hinged to the support legs 2 above the caster wheel 4. The positioning plate 13 has positioning holes. After moving to a suitable position, the caster wheel 4 is locked, and screws or other components are screwed into the positioning holes to fix the position of the mobile frame. When positioning is not required, the positioning holes can also be bolted vertically to the support legs 2. Figure 3 As shown.

[0023] The lever mechanism for pulling out the probe rod after measurement consists of a first motor 5 mounted on the base plate 1 and vertical plates 6 mounted on both sides of the upper part of the base plate 1. A lead screw 7 is connected to the output shaft of the first motor 5. A stop 8 is slidably connected to the two vertical plates 6, and the lead screw 7 is threadedly engaged with the stop 8. The height of the support leg 2 is adapted to the required penetration depth so that the probe rod can be pulled out after measurement. The stop 8 is specifically composed of a C-shaped frame 14 and a baffle 15. Grooves are provided on both vertical plates 6, and the C-shaped frame 14 is vertically slidably mounted in the two grooves. There are two baffles 15, which are respectively hinged to opposite ends of the C-shaped frame 14. Through holes for positioning are provided on the baffles 15 and the base plate 1, and positioning can be achieved by pins. Figure 4 As shown, through holes (not shown in the figure) are also provided on the side of the baffle 15 and the vertical plate 6, which are used to fix the position of the baffle 15 by bolts when the rod is not needed.

[0024] The lifting mechanism for the drop hammer consists of an L-shaped plate 9 detachably connected to the guide rod of the power penetrometer by bolts, and a second motor 10 mounted on the L-shaped plate 9. A rotating plate 11 is connected to the output shaft of the second motor 10, and a stop bar 12 is detachably connected to the drop hammer of the power penetrometer by bolts. When the second motor 10 drives the rotating plate 11 to rotate, when it rotates to the lowest position, the rotating plate 11 lifts the drop hammer upward through the stop bar 12. When it rotates to the top position, the rotating plate 11 separates from the stop bar 12, and the drop hammer loses its restraint and falls freely downward. The lengths of the rotating plate 11 and the stop bar 12 are determined according to the specific application scenario and process standards.

[0025] The first motor 5 and the second motor 10 mentioned above are stepper motors, and both are powered by diesel generators, batteries, vehicle power supplies, and other equipment.

[0026] The working principle of this utility model is as follows: When measuring the bearing capacity of the roadbed through a dynamic penetration test, the device is first moved to a suitable position by moving the frame, then the four casters 4 are fixed, and then the positioning plates 13 hinged on the four legs 2 are laid flat. The position of the device is fixed by screws or ground spikes to prevent movement during measurement. Then the first motor 5 and the second motor 10 are connected to the power supply.

[0027] During measurement, the second motor 10 is started, which drives the rotating plate 11 to rotate. During the rotation of the rotating plate 11, the stop rod 12 is used in conjunction with the rotating plate 11 to lift the falling hammer. Specifically, the rotating plate 11 lifts the falling hammer upward through the stop rod 12. When it reaches the top of the rotation, the rotating plate 11 separates from the stop rod 12, and the falling hammer loses its restraint and falls freely downward. This process is repeated multiple times to penetrate the probe into the foundation. The bearing capacity of the foundation is measured by the number of times the falling hammer is lifted and dropped, as well as the amount of penetration by the probe.

[0028] After the measurement is completed, rotate the two baffles 15 so that their ends face each other. Then, position them using pins, and start the first motor 5. The first motor 5 drives the lead screw 7 to rotate, which in turn moves the stop 8 upward. The ends of the two baffles 15 then abut against the protrusion at the upper end of the probe rod (e.g., Figure 2 As shown, as the baffle 8 moves upward, the probe is pulled out of the foundation. After the probe is pulled out, the first motor 5 is started in reverse to drive the baffle 8 to reset and rotate the two baffles 15 to fit with the vertical plate 6 and fix them with bolts.

Claims

1. A device for detecting the bearing capacity of roadbeds, comprising a dynamic cone penetrometer and a movable frame vertically slidingly engaged with the dynamic cone penetrometer, characterized in that, It also includes a lever mechanism mounted on the movable frame and a lifting mechanism detachably mounted on the power penetrometer; the lifting mechanism cooperates with the drop hammer of the power penetrometer to lift the drop hammer, and the lever mechanism cooperates with the penetrometer's probe rod to pull out the probe rod.

2. The device for detecting the bearing capacity of roadbed as described in claim 1, characterized in that, The mobile frame includes a base plate (1) and a support leg (2) located at the bottom of the base plate (1); the base plate (1) has an opening in the middle, the support leg (2) is provided with a guide plate (3), the guide plate (3) is vertically slidingly engaged with the probe rod of the power probe, and the support leg (2) is provided with a caster wheel (4) at the bottom.

3. The device for detecting the bearing capacity of roadbed as described in claim 2, characterized in that, The lever mechanism includes a first motor (5) mounted on a base plate (1) and vertical plates (6) mounted on both sides of the upper part of the base plate (1); the output shaft of the first motor (5) is connected to a lead screw (7), and two vertical plates (6) are slidably connected to a stop (8), and the lead screw (7) and the stop (8) are threaded together.

4. The device for detecting the bearing capacity of roadbed as described in claim 2, characterized in that, The lifting mechanism includes an L-shaped plate (9) detachably connected to the guide rod of the power penetrometer and a second motor (10) mounted on the L-shaped plate (9); a rotating plate (11) is connected to the output shaft of the second motor (10), and a stop bar (12) is detachably connected to the drop hammer of the power penetrometer.

5. The device for detecting the bearing capacity of roadbed as described in claim 2, characterized in that, A positioning plate (13) is hinged to the outrigger (2) above the caster wheel (4).

6. The device for detecting the bearing capacity of roadbed as described in claim 3, characterized in that, The baffle (8) consists of a C-shaped frame (14) that slides vertically with the two vertical plates (6) and baffles (15) hinged to opposite ends of the C-shaped frame (14).

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