A device for detecting the degree of compaction of a roadbed

Abstract

The utility model discloses a kind of subgrade compactness detection devices, belong to subgrade compactness detection device technical field, solve high humidity mudstone, clay and other special stratum, sample after sampling demoulding is difficult, to cause the problem of low accuracy of subgrade compactness detection easily. The utility model includes lifting support frame, motor is set on lifting support frame, sampling cylinder is set on the rotating shaft of motor and carries out subgrade sampling, perforation is set on the sampling cylinder of rotating shaft side, perforation is set on and is provided with through rod, the push plate that is connected with through rod and is slidably matched with the inner wall of sampling cylinder is set in sampling cylinder. The utility model is used for subgrade compactness detection.

Description

Technical Field

[0001] A roadbed compaction testing device is used for testing the compaction degree of roadbeds, belonging to the technical field of roadbed compaction testing devices. Background Technology

[0002] In highway engineering involving high-fill and deep-excavation roadbed construction, high-fill roadbeds first require foundation treatment, including surface clearing and compaction, treatment of weak foundations and groundwater treatment, followed by selection and control of fill materials, including optimal fill material selection, source and testing, and particle size control. Then, layered filling and compaction are carried out, including layer thickness, paving and leveling, and compaction techniques. Next, slope protection and drainage are implemented, and finally, settlement observation and stability monitoring are conducted. Deep-excavation roadbeds first require construction preparation and investigation, including detailed surveying, measurement and setting out, and prior drainage, followed by excavation, including layered excavation, blasting excavation, and mechanical excavation. Then, slope stabilization and protection are implemented, followed by foundation treatment, and finally, safety monitoring is conducted.

[0003] Both high-fill and deep-excavation roadbeds involve roadbed compaction testing. High-fill roadbeds focus on process control during layered filling, while deep-excavation roadbeds focus on the final verification of the subgrade acceptance. Sampling is a crucial step in the roadbed compaction testing process. However, the sampling devices used in existing technologies for roadbed compaction testing have the following technical problems: 1. In special strata such as high-humidity mudstone and cohesive soil, it is difficult to demold the samples after sampling, which can easily lead to low accuracy in the test of roadbed compaction. 2. The sampling tube is not easy to clean, which makes it easy to place the sample from the previous sampling point into the sampling tube, thus affecting the sampling of the next sampling point. Utility Model Content

[0004] The purpose of this invention is to provide a roadbed compaction testing device to solve the problem that the sample is difficult to remove after sampling in special strata such as high-humidity mudstone and cohesive soil, which easily leads to low accuracy in roadbed compaction testing.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A roadbed compaction testing device includes a lifting support frame, a motor mounted on the lifting support frame, a sampling cylinder mounted on the motor shaft for sampling the roadbed, a perforation on the sampling cylinder located on one side of the shaft, a through rod mounted on the perforation, and a push plate located inside the sampling cylinder that is connected to the through rod and slides against the inner wall of the sampling cylinder.

[0006] Furthermore, along the circumference of the sampling tube, multiple perforations are equally spaced on the sampling tube, and a corresponding through rod is inserted through each perforation; A connecting ring for connecting rods is fitted onto the rotating shaft.

[0007] Furthermore, the through rod includes a longitudinal rod that slides with the through hole, and a horizontal rod connected to the longitudinal rod to form an inverted L-shaped structure. One end of the horizontal rod is connected to the longitudinal rod, and the other end is connected to the connecting ring. The end connected to the connecting ring is located on one side of the edge of the sampling tube. When the crossbar comes into contact with the sampling cylinder, the bottom surface of the push plate and one end of the blade of the sampling cylinder are on the same horizontal plane.

[0008] Furthermore, a threaded connector is provided on the sampling cylinder located on one side of the rotating shaft, and an observation rod for visually estimating the sampling depth is connected to the threaded connector.

[0009] Furthermore, a rubber pad extending towards the connecting ring is provided at the top of the observation rod. When the connecting ring is lifted by the push plate and comes into contact with the rubber pad, the sampling depth is reached.

[0010] Furthermore, a handle is provided on one opposite side of the connecting ring.

[0011] Furthermore, the bottom of the crossbar is provided with a threaded hole corresponding to the sampling cylinder, and a threaded rod that contacts the sampling cylinder is threaded on the threaded hole.

[0012] Compared with the prior art, the advantages of this utility model are: I. This utility model features a perforation in the sampling cylinder, a sliding push plate inside the sampling cylinder, and a through rod connected to the push plate through the perforation. During sampling, the sample taken into the sampling cylinder will push up the push plate and the through rod. After sampling, if the sample cannot be removed from the sampling cylinder, the through rod is pushed to make the push plate push the sample out of the sampling cylinder. This effectively avoids the difficulty of demolding samples in special strata such as high-humidity mudstone and cohesive soil, which helps to maintain the integrity of the demolded sample and improves the accuracy of roadbed compaction testing. It also makes the sampling cylinder easier to clean, thus effectively preventing the sample from the previous sampling point from affecting the sampling of the next sampling point. Second, this utility model has multiple perforations at equal intervals along the circumference of the sampling tube, and corresponding through rods are provided. A connecting ring is also provided to connect the through rods, which facilitates the uniform application of force to the sample and the inner wall of the sampling tube during demolding and cleaning, thereby ensuring the integrity of the sample after demolding and the inner wall of the sampling tube can be cleaned more quickly. Third, the present invention defines the through rod as an inverted L-shaped structure including a longitudinal rod and a transverse rod, which is conducive to the initial positioning of the push plate (that is, when the transverse rod is in contact with the sampling tube, the bottom surface of the push plate and the blade end of the sampling tube are at the same horizontal plane). During the sampling process, when the sample lifts the longitudinal rod, the depth of the sample can be visually estimated through the longitudinal rod. IV. This utility model provides a threaded connector on the sampling cylinder and an observation rod on the threaded connector, which facilitates comparison between the raised longitudinal rod or connecting ring and the observation rod to more accurately determine whether the current sample has reached the sampling depth, so that the sample meets the sampling requirements. Fifth, this utility model has a rubber pad on the observation rod that cooperates with the connecting ring, which helps to accurately determine whether the depth of the current sample has reached the requirements; VI. The purpose of providing a handle on the connecting rod in this utility model is to facilitate applying force to the push rod through the handle; VII. This utility model provides a threaded hole at the bottom of the crossbar and a threaded rod on the threaded hole. The threaded rod and threaded hole can be matched according to the required sampling depth. This not only avoids the sample being affected by the push plate during sampling, but also allows the sampling depth to be known when the connecting ring or the through rod is lifted. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of the present invention, in which the push plate and the blade edge of the sampling cylinder are at the same level. Figure 2 for Figure 1 A partial structural diagram of the unfolded structure; Figure 3 This is a schematic diagram of the structure in this utility model where the threaded rod and the threaded hole cooperate to lift the connecting ring; Figure 4 This is a schematic diagram of the structure of the through rod, connecting ring and push plate in this utility model; In the diagram: 1-Lifting support frame, 2-Motor, 3-Rotating shaft, 4-Sampling cylinder, 5-Through hole, 6-Through rod, 7-Push plate, 8-Connecting ring, 9-Vertical rod, 10-Horizontal rod, 11-Threaded connector, 12-Observation rod, 13-Rubber pad, 14-Handle, 15-Threaded hole, 16-Threaded rod. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0017] In the description of this utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0018] Furthermore, the terms "first," "second," and "third" are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance.

[0019] Furthermore, the use of terms such as "horizontal," "vertical," and "suspended" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0020] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0022] Example 1 To address the challenge of sample removal from special geological formations such as high-humidity mudstone and cohesive soil, which can lead to low accuracy in subgrade compaction testing, the following measures are needed. Figure 1-4 As shown, a roadbed compaction testing device is provided, including a lifting support frame 1 (which is existing and will not be described in detail here), a motor 2 mounted on the lifting support frame 1, a sampling cylinder 4 mounted on the rotating shaft 3 of the motor 2 for sampling the roadbed, a through hole 5 provided on the sampling cylinder 4 located on one side of the rotating shaft 3, a through rod 6 provided on the through hole 5, and a push plate 7 located inside the sampling cylinder 4 that is connected to the through rod 6 and slides and cooperates with the inner wall of the sampling cylinder 4.

[0023] In practice, the device is moved to the sampling point, motor 2 is started, and the motor 2 drives the blade of the sampling cylinder 4 to cut and sample the sampling point. During sampling, the sample taken into the sampling cylinder 4 will lift the push plate 7 and the through rod 6. After sampling, the motor 2 and the sampling cylinder are moved upward along the lifting support frame 1 and can be fixed as needed. If the sample cannot be removed from the sampling cylinder 4, the push plate 7 is pushed by pushing the through rod 6 to remove the sample from the sampling cylinder 4. This effectively avoids the difficulty of demolding samples in special strata such as high-humidity mudstone and cohesive soil. It helps to maintain the integrity of the demolded sample, which improves the accuracy of roadbed compaction testing. At the same time, it is easy to clean the sampling cylinder, thus effectively avoiding the sample from the previous sampling point from being placed in the sampling cylinder and affecting the sampling of the next sampling point. This facilitates further compaction testing using the removed sample.

[0024] Example 2 Based on Example 1, multiple perforations 5 are evenly spaced along the circumference of the sampling cylinder 4, and a corresponding through rod 6 is inserted through each perforation 5; a connecting ring 8 for connecting the through rods is sleeved on the rotating shaft 3. The arrangement of multiple perforations at equal intervals along the circumference of the sampling cylinder, with corresponding through rods and connecting rings to connect the through rods, facilitates the application of force evenly to the sample and the inner wall of the sampling cylinder by hand during demolding and cleaning. This helps ensure the integrity of the sample after demolding and allows for faster cleaning of the inner wall of the sampling cylinder.

[0025] Example 3 Based on embodiment 2, the through rod 6 includes a vertical rod 9 that slides with the through hole 5, and a horizontal rod 10 connected to the vertical rod 9 to form an inverted L-shaped structure. One end of the horizontal rod 10 is connected to the vertical rod 9, and the other end is connected to the connecting ring 8. The end connected to the connecting ring 8 is located on one side of the edge of the sampling cylinder 4. When the horizontal rod 10 contacts the sampling cylinder 4, the bottom surface of the push plate 7 and the blade end of the sampling cylinder 4 are on the same horizontal plane.

[0026] In practice, when the crossbar 10 contacts the sampling cylinder 4, the push plate 7 can be in the initial state. During the sampling process, when the sample lifts the vertical bar, the sampling depth can be visually estimated through the vertical bar. Once the sampling depth is reached, the motor operation can be stopped, the motor and sampling cylinder will rise, and the sample in the sampling cylinder will be pushed out through the connecting ring by pushing the through rod and the push plate.

[0027] Example 4 Based on embodiment 3, a threaded connector 11 is also provided on the sampling cylinder 4 located on one side of the rotating shaft 3, and an observation rod 12 for visually estimating the sampling depth is threadedly connected to the threaded connector 11. Observation rods of different heights are installed on the threaded connector 11 according to the sampling depth.

[0028] In practice, when the sample lifts the rod 6 and the connecting ring 8, the lifted rod and connecting ring are compared with the observation rod to more accurately determine whether the sample has reached the sampling depth, so that the sample meets the sampling requirements.

[0029] Example 5 Based on Embodiment 4, a rubber pad 13 extending towards the connecting ring 8 is provided at the top of the observation rod 12. When the connecting ring 8 is lifted by the push plate 7 and comes into contact with the rubber pad 13, the sampling depth is reached. The rubber pad on the observation rod, in conjunction with the connecting ring, facilitates accurate determination of whether the current sampling depth meets the requirements.

[0030] Example 6 Based on embodiment 5, a handle 14 is provided on one opposite side of the connecting ring 8. The purpose of providing a handle on the connecting rod is to facilitate applying force to the push rod through the handle.

[0031] Example 7 Based on embodiment 6, the bottom of the crossbar 10 is provided with a threaded hole 15 corresponding to the sampling cylinder 4, and a threaded rod 16 that contacts the sampling cylinder 4 is threaded onto the threaded hole 15. Providing a threaded hole at the bottom of the crossbar and a threaded rod on the threaded hole allows for selection of the threaded rod and threaded hole to match the required sampling depth. This not only prevents the sample from being affected by the push plate during sampling, but also allows confirmation that the required sampling depth has been reached when the connecting ring or through rod is lifted.

[0032] In summary, threaded rod 16 and observation rod 12 can be selected for application.

Claims

1. A roadbed compaction testing device, comprising a lifting support frame (1), a motor (2) mounted on the lifting support frame (1), and a sampling cylinder (4) mounted on the rotating shaft (3) of the motor (2) for roadbed sampling, characterized in that: A perforation (5) is provided on the sampling tube (4) located on one side of the rotating shaft (3), and a through rod (6) is provided on the perforation (5). A push plate (7) is provided inside the sampling tube (4) and is connected to the through rod (6) and is in contact with and slides against the inner wall of the sampling tube (4).

2. The roadbed compaction testing device according to claim 1, characterized in that: Along the circumference of the sampling tube (4), multiple perforations (5) are provided at equal intervals on the sampling tube (4), and a through rod (6) is inserted through each perforation (5). A connecting ring (8) for connecting rods is fitted onto the rotating shaft (3).

3. The roadbed compaction testing device according to claim 2, characterized in that: The through rod (6) includes a vertical rod (9) that slides with the through hole (5), and a horizontal rod (10) that is connected to the vertical rod (9) to form an inverted L-shaped structure. One end of the horizontal rod (10) is connected to the vertical rod (9), and the other end is connected to the connecting ring (8). The end connected to the connecting ring (8) is located on one side of the edge of the sampling tube (4). When the crossbar (10) comes into contact with the sampling cylinder (4), the bottom surface of the push plate (7) and one end of the blade of the sampling cylinder (4) are on the same horizontal plane.

4. The roadbed compaction testing device according to claim 3, characterized in that: A threaded connector (11) is also provided on the sampling cylinder (4) located on one side of the rotating shaft (3), and an observation rod (12) is connected to the threaded connector (11) for visually estimating the sampling depth.

5. The roadbed compaction testing device according to claim 4, characterized in that: A rubber pad (13) is provided at the top of the observation rod (12) and extends to the side of the connecting ring (8). When the connecting ring (8) is pushed up by the push plate (7) and comes into contact with the rubber pad (13), the sampling depth is reached.

6. The roadbed compaction testing device according to claim 2, characterized in that: A handle (14) is provided on one opposite side of the connecting ring (8).

7. A roadbed compaction testing device according to claim 3, characterized in that: The bottom of the crossbar (10) is provided with a threaded hole (15) corresponding to the sampling cylinder (4), and a threaded rod (16) that contacts the sampling cylinder (4) is provided on the threaded hole (15).

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