A testing device for thick loess municipal roadbeds

Abstract

This utility model relates to the field of foundation testing technology, specifically a testing device for thick loess municipal roadbeds. It includes a frame, a penetrometer rod, and a core hammer. One end of the penetrometer rod has a probe. The penetrometer rod consists of a support rod and a splined rod, connected by a hammer block. The core hammer slides on the splined rod. A lifting assembly is mounted on the hammer block, comprising a connecting plate, a motor, and a lifting rod. The connecting plate is connected to the hammer block and its height is adjustable. The motor is located at the end of the connecting plate, and its output shaft passes through the connecting plate and connects to the lifting rod. The lifting rod is telescopic and has a lifting block at its end. A stop bar is provided on the side wall of the core hammer. The motor drives the lifting rod to rotate, causing the lifting block to hook onto the stop bar on the core hammer, achieving automatic lifting. This replaces manual operation, avoids operator fatigue, enables continuous and efficient testing, and improves the efficiency of large-scale roadbed testing.

Description

Technical Field

[0001] This utility model relates to the field of foundation testing technology, specifically a testing device for thick loess municipal roadbeds. Background Technology

[0002] In municipal road construction, the testing of thick loess subgrades is a crucial step in ensuring road quality. Currently, traditional foundation testing equipment for thick loess municipal road subgrades requires a dynamic cone penetrometer to detect the physical and mechanical properties of the subgrade, thereby assessing its bearing capacity, density, uniformity, and other engineering characteristics. This is mostly done manually using a mandrel hammer. This method has significant drawbacks:

[0003] On the one hand, operators need to frequently raise and lower the hammer, which is labor-intensive and easily leads to fatigue, resulting in low testing efficiency. This is especially true in large-scale roadbed testing scenarios, where the time and effort involved are particularly prominent. On the other hand, manual operation makes it difficult to precisely control the raising height of the hammer, resulting in poor stability of the hammering force. This can easily cause fluctuations in test data due to operator experience errors, affecting the accuracy of roadbed performance assessments and potentially leading to misjudgments.

[0004] Furthermore, existing testing devices typically have a fixed structure and lack the ability to be adjusted to meet the testing needs of different soil layers. Loess layers of different thicknesses and properties have different requirements for hammering energy, and fixed-structure devices are difficult to adapt flexibly, thus limiting their applicability. Utility Model Content

[0005] The purpose of this invention is to provide a testing device for thick loess municipal roadbeds, which solves the problems mentioned in the background art of the prior art, such as the inconvenience of lifting the core hammer and the lack of adjustment capability to adapt to the testing needs of different soil layers.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a detection device for thick loess municipal roadbeds, comprising a frame, a probe rod, and a through-hole hammer. One end of the probe rod is equipped with a probe. The probe rod consists of a support rod and a splined rod, connected by a hammer-striking block. The through-hole hammer is slidably engaged with the splined rod. A lifting assembly is provided on the hammer-striking block, comprising a connecting plate, a motor, and a lifting rod. The connecting plate is connected to the hammer-striking block, and its height is adjustable. The motor is located at the end of the connecting plate, and its output shaft passes through the connecting plate and connects to the lifting rod. The lifting rod is telescopic and has a lifting block at its end. A stop bar is provided on the side wall of the through-hole hammer.

[0007] Furthermore, the connecting plate consists of a positioning cylinder plate and a telescopic plate. The positioning cylinder plate is connected to the hammer block, and the telescopic plate is located inside the positioning cylinder plate and can slide inside the positioning cylinder plate. The motor is located on the telescopic plate.

[0008] Furthermore, the lifting rod consists of a rotating sleeve and a telescopic rod. The rotating sleeve is connected to the motor output shaft, the telescopic rod is located inside the rotating sleeve and can slide inside the rotating sleeve, and the lifting block is located on the telescopic rod.

[0009] Furthermore, the positioning cylinder plate, telescopic plate, rotating sleeve, and telescopic rod are all provided with limit holes, and the limit holes are internally threaded with limit rods.

[0010] Furthermore, the end of the spline rod is provided with a buffer assembly, which includes a buffer rod and a spring. The buffer rod is connected to the end of the spline rod, and the spring is sleeved on the buffer rod and connected to the end of the buffer rod.

[0011] Furthermore, a bracket is slidably mounted on the support rod.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This utility model has the following beneficial effects:

[0014] 1. Automated lifting and dropping of the hammer improves inspection efficiency: The motor drives the lifting rod to rotate, which in turn drives the lifting block to hook onto the stop bar on the hammer to achieve automatic lifting, replacing manual operation, avoiding operator fatigue, enabling continuous and efficient inspection, and improving the work efficiency of large-scale roadbed inspection.

[0015] 2. Precise control of hammering height enhances data reliability: Both the connecting plate and the lifting rod are equipped with adjustable structures. The height is fixed by the limiting holes and the limiting rod, ensuring consistent hammering height each time. This guarantees the stability of the hammering force, making the test data more accurate and repeatable, and avoiding misjudgments of subgrade performance due to human experience errors. Furthermore, the lengths of both the connecting plate and the lifting rod are adjustable to adapt to the varying hammering energy requirements of different soil layers, expanding the applicability of the device.

[0016] 3. Buffer assembly enhances equipment safety: A buffer assembly consisting of a buffer rod and a spring is installed at the end of the splined rod. When the hammer is raised to the top due to misoperation, the spring is compressed to absorb the impact force, and the buffer rod limits the compression stroke to prevent hard collisions, extend the service life of the equipment and reduce operational risks. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the present invention;

[0018] Figure 2This is a biaxial drawing of the present invention;

[0019] Figure 3 This is a front view of the present utility model.

[0020] In the diagram: 1. Penetrating rod; 2. Through hammer; 3. Probe; 4. Support rod; 5. Spline rod; 6. Hammering block; 7. Lifting assembly; 8. Connecting plate; 9. Motor; 10. Lifting rod; 11. Lifting block; 12. Stop bar; 13. Positioning cylinder plate; 14. Telescopic plate; 15. Rotating sleeve; 16. Telescopic rod; 17. Limiting hole; 18. Limiting rod; 19. Buffer assembly; 20. Buffer rod; 21. Spring; 22. Bracket. Detailed Implementation

[0021] Please see Figures 1 to 3 A testing device for thick loess municipal roadbeds includes a penetrometer 1, a hammer 2, and a support 22. The penetrometer 1 consists of a support rod 4 and a splined rod 5, with a probe 3 at the bottom of the support rod 4. The support rod 4 and the splined rod 5 are connected by a hammering block 6, and the hammer 2 is slidably engaged with the splined rod 5. The support rod 4 is slidably connected to the support 22 and can slide vertically on the support 22. The hammering block 6 is equipped with a lifting assembly 7, which moves the hammer 2 upwards and allows it to fall freely to strike the hammering block 6. The lifting assembly 7 includes a connecting plate 8, a motor 9, and a lifting rod 10. The connecting plate 8 is connected to the hammer block 6, and the height of the connecting plate 8 is adjustable. The motor 9 is located at the end of the connecting plate 8, and the output shaft of the motor 9 passes through the connecting plate 8 and is connected to the lifting rod 10, which can drive the lifting rod 10 to rotate. The lifting rod 10 is telescopic and has a lifting block 11 at its end. A stop bar 12 is provided on the side wall of the through hammer 2, and the stop bar 12 is arranged in the same direction as the lifting rod 10.

[0022] Specifically,

[0023] The connecting plate 8 consists of a positioning cylinder plate 13 and a telescopic plate 14. The positioning cylinder plate 13 is connected to the hammer block 6, the telescopic plate 14 is located inside the positioning cylinder plate 13 and can slide inside the positioning cylinder plate 13, and the motor 9 is located on the telescopic plate 14.

[0024] The lifting rod 10 consists of a rotating sleeve 15 and a telescopic rod 16. The rotating sleeve 15 is connected to the motor output shaft, the telescopic rod 16 is located inside the rotating sleeve 15 and can slide inside the rotating sleeve 15, and the lifting block 11 is located on the telescopic rod 16.

[0025] Limiting holes 17 are provided on the positioning cylinder plate 13, telescopic plate 14, rotating sleeve 15 and telescopic rod 16. Limiting rods 18 are connected to the internal threads of the limiting holes 17. After the lengths of the connecting plate 8 and the lifting rod 10 are adjusted, their positions are fixed by the limiting rods 18.

[0026] The end of the spline rod 5 is provided with a buffer assembly 19, which includes a buffer rod 20 and a spring 21. The buffer rod 20 is connected to the end of the spline rod 5, and the spring 21 is sleeved on the buffer rod 20 and connected to the end of the buffer rod 20. If the hammer 2 moves upward to the top of the spline rod 5 due to improper operation, the spring 21 can buffer the upward impact to prevent accidents.

[0027] Working principle of this utility model:

[0028] I. Equipment Preparation and Height Adjustment

[0029] 1. Installation and initial adjustment: Align the probe 3 at the bottom of the probe rod 1 with the detection position, slide the support rod 4 to the bracket 22, and fix the bracket 22 at the detection position to ensure that the device is stably placed at the roadbed detection point.

[0030] 2. Height Adjustment: Adjust the height of the connecting plate 8 and the length of the lifting rod 10 according to the testing requirements. Specifically, adjust the overall height of the connecting plate 8 by sliding the telescopic plate 14 within the positioning cylinder plate 13, so that the motor 9 and the lifting rod 10 are in a suitable vertical position; at the same time, adjust the total length of the lifting rod 10 by sliding the telescopic rod 16 within the rotating sleeve 15, so that the lifting block 11 can abut against the stop bar 12 on the side wall of the through hammer 2. After adjustment, fix the position of the connecting plate 8 and the lifting rod 10 by passing the limiting rod 18 through the limiting hole 17 and tightening it, ensuring that the height remains unchanged during the testing process.

[0031] II. Automatic Lifting and Drop Detection of the Hammer Piercing Hammer

[0032] 1. Automatic Lifting Process: Start motor 9, and the output shaft of motor 9 drives the lifting rod 10 to rotate. Since the lifting block 11 is located at the end of the telescopic rod 16 and is in the same direction as the stop bar 12, the rotating lifting rod 10 will cause the lifting block 11 to gradually approach the stop bar 12 on the through hammer 2. When the lifting block 11 contacts the stop bar 12, as the lifting rod 10 continues to rotate, the lifting block 11 abuts against the stop bar 12, causing the through hammer 2 to slide upward along the spline rod 5, thereby realizing the automatic lifting of the through hammer 2.

[0033] 2. Free-fall hammer test: When the mandrel 2 is raised to its highest point, the motor 9 continues to drive the lifting rod 10 to rotate. At this time, the stop bar 12 on the mandrel 2 separates from the lifting rod 10, and the mandrel 2 loses its lifting force, falling freely under the action of gravity, striking the hammer block 6, and then transmitting the impact force to the probe 3 through the probe rod 1, causing the probe 3 to penetrate into the soil layer. By measuring data such as the penetration depth of the probe 3, the physical and mechanical properties of the soil layer are determined, completing one test process.

[0034] III. Buffering and Continuous Detection

[0035] 1. Buffer Protection: If, during operation, the hammer 2 is accidentally raised to the end of the spline rod 5, the buffer assembly 19 (buffer rod 20 and spring 21) at the end of the spline rod 5 will function. The spring 21 absorbs the impact force of the hammer 2 through compression deformation, and the buffer rod 20 limits the compression stroke of the spring 21, preventing the hammer 2 from colliding hard with the end of the spline rod 5 and ensuring the safety of the device.

[0036] 2. Continuous Testing Cycle: After one hammer test is completed, motor 9 is restarted to repeat the lifting and dropping process, thus enabling continuous testing. This automated cyclical operation improves testing efficiency. Furthermore, since the lifting height can be controlled by the limiting hole 17 and the limiting rod 18, the consistency of the hammer force for each strike is ensured, resulting in good repeatability and comparability of the test data.

Claims

1. A testing device for thick loess municipal roadbeds, comprising a penetrometer (1) and a hammer (2), wherein one end of the penetrometer (1) is provided with a probe (3), characterized in that, The probe rod (1) is composed of a support rod (4) and a spline rod (5). The support rod (4) and the spline rod (5) are connected by a hammer block (6). The hammer (2) slides with the spline rod (5). The hammer block (6) is provided with a lifting assembly (7). The lifting assembly (7) includes a connecting plate (8), a motor (9), and a lifting rod (10). The connecting plate (8) is connected to the hammer block (6). The height of the connecting plate (8) is adjustable. The motor (9) is located at the end of the connecting plate (8), and the output shaft of the motor (9) passes through the connecting plate (8) and is connected to the lifting rod (10). The lifting rod (10) is telescopic and has a lifting block (11) at its end. The side wall of the hammer (2) is provided with a stop bar (12).

2. The detection device as described in claim 1, characterized in that, The connecting plate (8) is composed of a positioning cylinder plate (13) and a telescopic plate (14). The positioning cylinder plate (13) is connected to the hammer block (6). The telescopic plate (14) is located inside the positioning cylinder plate (13) and can slide inside the positioning cylinder plate (13). The motor (9) is located on the telescopic plate (14).

3. The detection device as described in claim 1, characterized in that, The lifting rod (10) is composed of a rotating sleeve (15) and a telescopic rod (16). The rotating sleeve (15) is connected to the motor output shaft. The telescopic rod (16) is located inside the rotating sleeve (15) and can slide inside the rotating sleeve (15). The lifting block (11) is located on the telescopic rod (16).

4. The detection device as described in claim 2, characterized in that, Limiting holes (17) are provided on the positioning cylinder plate (13), telescopic plate (14), rotating sleeve (15) and telescopic rod (16), and the limiting holes (17) are internally threaded with limiting rods (18).

5. The detection device as described in claim 1, characterized in that, The end of the spline rod (5) is provided with a buffer assembly (19), which includes a buffer rod (20) and a spring (21). The buffer rod (20) is connected to the end of the spline rod (5), and the spring (21) is sleeved on the buffer rod (20) and connected to the end of the buffer rod (20).

6. The detection device as described in claim 1, characterized in that, A bracket (22) is slidably mounted on the support rod (4).

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