Water bag device for subgrade compactness test

Abstract

The utility model relates to test instrument field especially relates to a kind of water bag device for subgrade compactness test.A kind of water bag device for subgrade compactness test, including fixed steel ring, fixed steel ring is provided with universal bubble instrument and sealing elastic ring;Vacuumizing component is set on the upper portion of fixed steel ring;External matched plastic bag is used in conjunction with fixed steel ring.The air between plastic bag and test pit is extracted by the air extraction ring of the vacuumizing equipment connected to the butt joint part, so that the cylindrical plastic bag is tightly attached to the inside of test pit, thereby ensuring the accuracy of the volume of soil obtained from the final test pit, the volume of soil obtained is obtained by accurate measurement and calculation, avoiding determining the water injection amount by observing that water surface is flush with pit opening, avoiding the error of final test result due to artificial observation.

Description

Technical Field

[0001] This utility model relates to the field of testing instruments, and in particular to a water bag device for testing the compaction degree of roadbed. Background Technology

[0002] Compaction degree, also known as tamping degree, refers to the ratio of the dry density of compacted soil or other road construction materials to the standard maximum dry density. Developing on-site testing methods for roadbed compaction degree is crucial for evaluating the compaction quality of roadbed structural layers. Currently, the commonly used method in the field is the water bag method. The key to measuring compaction degree lies in knowing the volume of the soil sample taken. The water bag method, also called the water filling method, first requires digging a test pit of fixed diameter and depth on the ground. A soil sample is taken out, weighed, and its moisture content is measured. Then, a plastic film bag slightly larger than the pit's volume is tightly attached to the bottom and walls of the pit. The bag is then opened at the ground level, and the opening is secured with a weight. A certain volume of water is poured into the pit until the water level is level with the pit opening. The volume of the injected water is converted into the volume of the soil sample taken out, and then the dry density and compaction degree of the sample are calculated. However, there is a significant human error in the process of attaching the plastic film bag to the pit walls, especially when observing that the water level is level with the pit opening, making it difficult to guarantee the accuracy of the measured soil sample volume. Utility Model Content

[0003] To overcome the significant human error in the process of attaching plastic film bags to the pit wall, especially when observing that the water surface is level with the pit opening, making it difficult to ensure the accuracy of the measured soil sample volume, this utility model provides a water bag device for testing the compaction degree of roadbed.

[0004] Technical solution: A water bag device for testing the compaction degree of roadbed, including a fixed steel ring, on which a universal bubble meter and a sealing elastic ring are installed; The vacuum assembly is located on the upper part of the fixed steel ring; The peripheral device comes with a plastic bag for use with a fixing steel ring.

[0005] More preferably, the lower part of the fixing steel ring is provided with a soil-binding part.

[0006] More preferably, the vacuum assembly includes a vacuum ring disposed on the upper part of the inner wall of the fixed steel ring and a vacuum pipe communicating with the vacuum ring and penetrating the outer wall of the fixed steel ring, wherein the inner ring surface of the vacuum ring has a vacuum hole.

[0007] More preferably, the annular equidistant array of air extraction holes has several elements.

[0008] More preferably, each air extraction hole of the air extraction ring is equipped with a breathable cloth.

[0009] More preferably, the extraction pipe is equipped with a connecting part and a sealing plug.

[0010] More preferably, the air extraction pipe is equipped with a rubber section.

[0011] More preferably, the outer ring surface of the fixing steel ring is provided with a sealing groove that matches the sealing elastic ring.

[0012] More preferably, the outer ring surface of the fixing steel ring is provided with a snap-on groove.

[0013] Compared with the prior art, this utility model has the following advantages: the external vacuum equipment of the docking part extracts the air between the plastic bag and the test pit through the air extraction ring, so that the cylindrical plastic bag is tightly attached to the inside of the test pit, thereby ensuring the accuracy of the final soil volume taken out of the test pit. The soil volume is obtained by accurate measurement and calculation, avoiding the need to determine the water injection volume by observing that the water surface is level with the pit opening, and avoiding errors in the final test results due to human observation. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a partial cross-sectional view of the fixing steel ring of this utility model; Figure 3 This is an enlarged view of area A of this utility model.

[0015] The above-mentioned attached drawings include the following reference numerals: 1-fixed steel ring, 101-soil-binding part, 102-clamping groove, 2-universal bubble meter, 3-sealing elastic ring, 4-air extraction ring, 5-air extraction pipe, 501-rubber part, 502-joint part, 503-sealing plug. Detailed Implementation

[0016] Although this invention may be described with respect to a particular application or industry, those skilled in the art will recognize its broader applicability. Those skilled in the art will understand that terms such as "above," "below," "upward," "downward," etc., are used to describe the drawings and not to indicate a limitation on the scope of the invention as defined by the appended claims. Any numerical designations such as "first" or "second" are merely illustrative and not intended to limit the scope of the invention in any way.

[0017] Example A water bag device for testing the compaction degree of roadbed, based on Figures 1-3 As shown, it includes: A fixed steel ring 1 is provided, on which a universal bubble meter 2 and a sealing elastic ring 3 are installed; The vacuum assembly is located on the upper part of the fixed steel ring 1; The peripheral plastic bag is used in conjunction with the fixing steel ring 1.

[0018] The lower part of the fixing steel ring 1 is provided with a soil-binding part 101, which facilitates the fixing steel ring 1 to be driven into the soil and makes on-site testing easier.

[0019] The vacuum assembly includes a vacuum ring 4 disposed on the upper part of the inner wall of the fixed steel ring 1 and a vacuum pipe 5 communicating with it and penetrating the outer wall of the fixed steel ring 1. The inner ring surface of the vacuum ring 4 has a vacuum hole.

[0020] The annular equidistant array of air extraction holes has several components, which improves the vacuuming effect of the air extraction ring 4.

[0021] Each air extraction hole of the air extraction ring 4 is equipped with a breathable cloth to prevent the plastic bag from being sucked to a hole and broken.

[0022] The vacuum pipe 5 is provided with a docking part 502 and a sealing plug 503, which facilitates the connection of the vacuum pipe 5 to an external vacuuming device through the docking part 502. After vacuuming, the docking part 502 is sealed by the sealing plug 503 to ensure the vacuuming effect.

[0023] The vacuum pipe 5 is equipped with a rubber part 501. After the vacuum is completed, the operator can seal the vacuum pipe 5 by pinching the rubber part 501. This ensures the vacuum effect before the sealing plug 503 seals the docking part 502 after the external vacuum equipment is removed.

[0024] The outer ring surface of the fixed steel ring 1 is provided with a sealing groove that matches the sealing elastic ring 3, so that the sealing elastic ring 3 can seal the opening of the plastic bag on the outer ring surface of the fixed steel ring 1.

[0025] The outer ring surface of the fixed steel ring 1 is provided with a snap-on groove 102, which makes it easy to remove the sealing elastic ring 3 from the fixed steel ring 1.

[0026] During use, at the test site, select a flat surface, clean it, and ensure its area is larger than the circular area of ​​the fixed steel ring 1. Then, place the fixed steel ring 1 on the flat roadbed surface and press it into the test roadbed soil to a predetermined depth. Simultaneously, observe the universal bubble meter 2 to ensure the fixed steel ring 1 remains horizontal and penetrates deeply. Then, remove the soil from the inner wall of the fixed steel ring 1 and dig downwards to a predetermined depth to obtain a test pit. Next, place a cylindrical plastic bag inside the fixed steel ring 1, remove the sealing elastic ring 3 from the fixed steel ring 1, and turn the opening of the cylindrical plastic bag outwards to the outer ring surface of the fixed steel ring 1. Then, seal the opening of the cylindrical plastic bag by engaging the sealing groove on the outer ring surface of the fixed steel ring 1 with the sealing elastic ring 3. Then, open the sealing plug 503 on the docking part 502. The vacuum equipment connected to the docking part 502 uses the vacuum ring 4 to extract the air between the plastic bag and the test pit, ensuring that the cylindrical plastic bag adheres tightly to the inside of the test pit. This guarantees the accuracy of the final soil volume extracted from the test pit. After vacuuming, the operator can squeeze the rubber part 501 to operate the vacuum pipe 5. Seal the container and remove the vacuum equipment to allow for continued use in other test pits. Then, seal the joint 502 with the sealing plug 503. Next, inject a predetermined amount of water into the plastic bag of the test pit. At this point, the water level inside the plastic bag is higher than the test surface. Measure the height from the top of the outer wall of the fixed steel ring 1 to the test surface using a ruler, and measure the height from the top of the inner wall of the fixed steel ring 1 to the horizontal plane using a ruler. This will give you the height of the water in the plastic bag above the test surface. Since the radius of the fixed steel ring 1 is fixed and known, the volume of water above the test surface in the plastic bag can be calculated using the cylinder volume calculation formula. The volume of all water injected into the plastic bag is known. Subtracting the volume of water above the test surface from the total volume of water injected into the plastic bag gives you the volume of soil removed from the test pit. This method allows for accurate measurement and calculation of the removed soil volume, avoiding the need to determine the water injection volume by manually observing that the water level is level with the pit opening, and preventing errors in the final test results due to human observation.

[0027] The above embodiments are provided for those skilled in the art to implement or use the present invention. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the protection scope of the present invention is not limited to the above embodiments, but should be the maximum scope that conforms to the innovative features mentioned in the claims.

Claims

1. A water bag device for testing the compaction degree of roadbed, characterized in that, include: A fixed steel ring (1) is provided with a universal bubble meter (2) and a sealing elastic ring (3). The vacuum assembly is located on the upper part of the fixed steel ring (1); The plastic bag is used as an external accessory component in conjunction with the fixing steel ring (1).

2. The water bag device for testing roadbed compaction according to claim 1, characterized in that, The lower part of the fixed steel ring (1) is provided with a soil-binding part (101).

3. The water bag device for testing roadbed compaction according to claim 1, characterized in that, The vacuum assembly includes a vacuum ring (4) disposed on the upper part of the inner wall of the fixed steel ring (1) and a vacuum pipe (5) communicating with it and penetrating the outer wall of the fixed steel ring (1). The inner ring surface of the vacuum ring (4) has a vacuum hole.

4. The water bag device for testing roadbed compaction according to claim 3, characterized in that, The annular equidistant array of the air extraction holes consists of several parts.

5. A water bag device for testing roadbed compaction according to any one of claims 3-4, characterized in that, Each air extraction hole of the air extraction ring (4) is equipped with a breathable cloth.

6. The water bag device for testing roadbed compaction according to claim 3, characterized in that, The air extraction pipe (5) is provided with a docking part (502) and a sealing plug (503).

7. The water bag device for testing roadbed compaction according to claim 3, characterized in that, The air extraction pipe (5) is equipped with a rubber part (501).

8. The water bag device for testing roadbed compaction according to claim 7, characterized in that, The outer ring surface of the fixed steel ring (1) is provided with a sealing groove that matches the sealing elastic ring (3).

9. A water bag device for testing roadbed compaction according to claim 8, characterized in that, The outer ring of the fixed steel ring (1) is provided with a snap-fit ​​groove (102).

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