Central soil sample taking-out device and method for measuring moisture content of soil sample in cutting ring experiment

Abstract

The invention discloses a central soil sample taking-out device and method for measuring the moisture content of a soil sample in a cutting ring experiment, and the central soil sample taking-out device comprises a pressing rod, a connecting rod, a small-diameter pipe, a guide rail, a limiting rod, a transmission block, a control rod, an isolation column and a material pushing rod. The efficiency of taking a soil sample from the cutting ring during a cutting ring moisture content experiment is greatly improved, the soil at the center in the cutting ring is obtained, the moisture content of the soil is the smallest from a site to a laboratory, and the measurement accuracy can be improved while the efficiency is improved. And the method has important significance on the implementation of a large-quantity wide-area soil sample moisture content measurement experiment in the cutting ring.

Description

Technical Field

[0001] The invention belongs to the technical field of water conservancy engineering, and in particular relates to a central soil sample taking-out device and method for measuring the moisture content of soil samples in a ring knife experiment. Background Art

[0002] In the construction of water conservancy projects, accurate determination of soil physical properties is crucial to project quality and safety. Knife ring sampling is a key method for obtaining undisturbed soil samples and is widely used in various stages of water conservancy project investigation, design, construction and monitoring. However, with the rapid development of my country's water conservancy industry, the number of large-scale water conservancy projects has increased sharply, and the demand for knife ring sampling has exploded. Traditional manual sampling methods face many challenges: First, water conservancy projects are large in scale and usually require a large amount of sampling over a wide area, which leads to a huge demand for knife rings; Secondly, when conducting moisture content experiments in traditional knife ring experiments, soil samples are often dug out gradually from the knife ring by hand, and then weighed. The sampling process easily causes sample disturbance, affecting the measured moisture content and the accuracy of subsequent test results, and the original manual sampling method takes a lot of time. These factors not only increase project costs, but may also delay construction and affect the overall progress of the project. Therefore, the development of a device and method that can quickly, efficiently and standardizedly complete soil sampling in the knife ring has important practical significance and urgent needs. Such a device will significantly improve the efficiency of knife ring experiments, ensure sample quality, reduce labor costs, and promote the smooth progress of the entire project. Summary of the invention

[0003] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides a device and method for removing a central soil sample for measuring the moisture content of soil samples in a ring knife test, thereby realizing efficient sampling of the central soil inside a ring knife during the process of measuring the moisture content of a ring knife test.

[0004] (II) Technical solution To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a central soil sample extraction device and method for measuring the moisture content of soil samples in a ring knife experiment, which is used for measuring the moisture content in a ring knife experiment of a water conservancy project; The device significantly improves the efficiency and success rate of moisture content measurement in the ring knife test through its ingenious structural design, and is particularly suitable for the implementation of large-scale ring knife tests. Its specific components include: Pressure rod, connecting rod, guide rail, transmission block, small diameter round tube, spacer column, base, limit rod, upper wedge block, baffle; The pressure rod is hingedly connected to the upper wedge block; The pressure rod is hingedly connected to the connecting rod; The connecting rod is hingedly connected to the transmission block; The transmission block is provided with an annular handle; The transmission block is sleeved in the guide rail and is used to limit its movement in the vertical direction when the pressure rod drives it to move; The small diameter round tube is arranged below the transmission block and moves with the movement of the pressure rod; The isolation column is connected to the base and the baffle.

[0005] This design greatly optimizes the sampling process of the soil in the knife ring. Through its structural design, the device can easily take out the soil sample in the center of the knife ring during the knife ring experiment, which greatly improves the efficiency of the knife ring experiment. The moisture content measurement results are minimally affected by the environment, providing important support for large-scale knife ring experiments, reducing manpower consumption and improving the accuracy of moisture content measurement.

[0006] Preferably, the compression rod of the device is composed of two sections, connected by a handle to improve strength, and the length is greater than 1.5 times the length of the base to optimize the force-bearing structure; Preferably, the angle between the pressing rod and the connecting rod is always greater than 90 degrees during the pressing process; Preferably, the transmission block can only move vertically up and down under the constraint of the guide rail; Preferably, the length of the limiting rod is smaller than the height of the ring knife; Preferably, a blade is cut at the bottom of the small diameter round tube to make it easy to press into the soil, and the inside needs to be polished to reduce friction so that the soil sample is not easily retained inside; Preferably, the isolation column needs to ensure that the position of the ring knife and the push rod is fixed each time they are inserted; Preferably, the outer shell of the push rod is consistent with the size of the ring cutter, and the diameter of the inner rod is smaller than the inner diameter of the small diameter ring cutter, but the difference shall not exceed 1mm; A method for taking out a central soil sample based on the central soil sample taking out device for measuring the moisture content of soil samples in a ring knife experiment specifically comprises the following steps: S1: lift the pressure rod; S2: Cut the two ends of the ring cutter flat according to the specification requirements and place it on the isolation column of the device; S3: The pressure rod is pressed down to make the small diameter tube penetrate the ring cutter soil sample; S4: The pressure rod is lifted, and the ring knife is replaced by the push rod; S5: The pressure rod is pressed down to make the push rod slowly push out the soil; S6: Collect soil samples required for moisture content experiment.

[0007] (III) Beneficial effects Compared with the prior art, the present invention provides a central soil sample extraction device and method for measuring the moisture content of soil samples in a ring knife test, which has the following beneficial effects: 1. When the present invention is used, the operating efficiency of taking soil samples from the ring cutter can be greatly improved, and the soil samples in the ring cutter can be quickly taken out and collected in sections; 2. When the present invention is used, the soil sample at the center of the ring cutter can be accurately taken out. The soil sample at the center can best represent the state of the soil on site. The moisture content of this part of the soil sample changes the least from the site to the laboratory, ensuring the reliability and representativeness of the test data; 3. When the present invention is in use, the cooperation between the guide rail and the pressure rod can save effort during operation while ensuring the vertical movement of the small diameter pipe and reducing the resistance of the soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is an overall schematic diagram of a central soil sample extraction device for measuring the moisture content of soil samples in a ring knife experiment; Figure 2 The schematic diagram of the push rod of the device is shown in FIG. Figure 3 This is a schematic diagram of the device in a state where the pressure rod is lifted; Figure 4 This is a schematic diagram of the device in a state where the pressure rod is pressed down; Figure 5 Schematic diagram of the method for removing soil samples from the center of the ring knife. DETAILED DESCRIPTION

[0009] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0010] like Figure 1 As shown, the present invention discloses a schematic diagram of the overall structure of a central soil sample extraction device for measuring the moisture content of soil samples in a ring knife experiment.

[0011] A central soil sample extraction device and method for measuring the moisture content of soil samples in a ring knife experiment, which is used for measuring the moisture content in a ring knife experiment of a water conservancy project; The device significantly improves the efficiency and success rate of moisture content measurement in the ring knife test through its ingenious structural design, and is particularly suitable for the implementation of large-scale ring knife tests. Its specific components include: Pressure rod 1, connecting rod 3, guide rail 4, transmission block 5, small diameter round tube 6, isolation column 7, base 8, limit rod 9, upper wedge block 10, baffle 11; The pressure rod 1 is hingedly connected to the upper wedge block 10; The pressure rod 1 is hingedly connected to the connecting rod 3; The connecting rod 3 is hingedly connected to the transmission block 5; The transmission block 5 is provided with an annular handle; The transmission block 5 is sleeved in the guide rail 4 and is used to limit the movement of the pressure rod 1 in the vertical direction. The small diameter round tube 6 is arranged below the transmission block 5 and moves with the movement of the pressure rod 1; The isolation column 7 is connected to the base 8 and the baffle 11 .

[0012] The pressure rod 1 is hingedly connected to the connecting rod 3, and the connecting rod 3 is hingedly connected to the transmission block 5. The transmission block is provided with a ring cutter handle. When the pressure rod 1 moves downward, it will drive the small diameter tube 6 to move downward. The transmission block 5 is sleeved in the limit rod to ensure that the pressure rod can only move in the vertical direction when it drives it to move. The pressure rod moves upward to take out the soil sample at the center of the ring cutter in the small diameter tube. At this time, the push rod is replaced to control the pressure rod to continue to move downward. The push rod can push out the soil sample obtained from the small diameter tube. At this time, the pushed soil material can be collected in sections for moisture content testing experiments. The device and method can be used in the link of measuring moisture content in the ring cutter compaction experiment, greatly improving the efficiency of taking soil samples from the ring cutter when doing the ring cutter moisture content experiment, and the soil obtained is the most central soil in the ring cutter. This part of soil is the one with the smallest moisture content change from the field to the laboratory. While improving efficiency, it can also improve the accuracy of measurement, which is of great significance to the implementation of soil moisture content measurement experiments in large quantities and wide areas of ring cutters.

[0013] The present invention greatly optimizes the sampling process of the soil in the ring knife. Through its structural design, the device can easily take out the soil sample in the center of the ring knife during the ring knife experiment, which greatly improves the efficiency of taking out the ring knife experiment, and the result of moisture content measurement is minimally affected by the environment, which provides important support for large-scale ring knife experiments, reduces manpower consumption and improves the accuracy of moisture content measurement.

[0014] Furthermore, the pressure rod 1, the connecting rod 3, the guide rail 4, the limit rod 9, the transmission block 5 and the isolation column 7, and the push rod 12 are made of hard steel; the small diameter round tube 6 is made of special steel; Furthermore, the pressure rod 1 of the device is composed of two sections, connected by a handle 2 to improve strength, and the length is greater than 1.5 times the length of the base to optimize the force-bearing structure; this example adopts a length of 2; Furthermore, the angle between the pressing rod 1 and the connecting rod 3 is always greater than 90 degrees during the pressing process; in this embodiment, the angle is designed to be between 100 degrees and 135 degrees.

[0015] Furthermore, the transmission block 5 can only move vertically up and down under the constraint of the guide rail 4; the guide rail in this example is polished to reduce friction during operation.

[0016] Furthermore, the length of the limit rod 9 is less than the height of the ring knife, and 52 mm is selected in this example; Furthermore, a blade is cut at the bottom of the small diameter circular tube 6 to facilitate pressing into the soil, and the inside needs to be polished to reduce friction so that the soil sample is not easily retained inside; this example uses anodized polishing; Furthermore, the isolation column 7 needs to ensure that the position of the ring knife and the push rod 12 is fixed each time they are inserted. In this example, 6 isolation columns are used, which are connected by bolts; The push rod 12 is used to push out the soil sample in the small diameter tube 6 after the soil sample is taken out of the small diameter tube 6; Furthermore, the outer shell of the push rod 12 is consistent with the size of the ring cutter, and the diameter of the inner rod is smaller than the inner diameter of the small diameter ring cutter, but the difference shall not exceed 1mm; Furthermore, the central soil sample extraction method suitable for measuring the moisture content of soil samples in the ring knife test is as follows: Figure 5 As shown, it mainly includes the following steps: S1: lift the pressure rod 1; S2: Cut the two ends of the ring cutter flat according to the specification requirements and place it at the isolation column 7 of the device; S3: the pressure rod 1 is pressed downward to make the small diameter tube 6 penetrate the ring cutter soil sample; S4: The pressure rod 1 is lifted, and the ring knife is replaced by the push rod 12; S5: the pressure rod 1 is pressed down, so that the push rod 12 is slowly pushed out of the soil; S6: Collect soil samples required for moisture content experiment.

[0017] It should be noted that the term "comprises" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements that are inherent to such process, method, article, or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0018] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A central soil sample extraction device for measuring the moisture content of soil samples in a ring knife test, characterized in that: include: A pressure rod (1), a connecting rod (3), a guide rail (4), a transmission block (5), a small diameter round tube (6), a spacer column (7), a base (8), a limit rod (9), an upper wedge block (10), and a baffle (11); The pressure rod (1) is hingedly connected to the upper wedge block (10); The pressure rod (1) is hingedly connected to the connecting rod (3); The connecting rod (3) is hingedly connected to the transmission block (5); The transmission block (5) is provided with an annular handle; The transmission block (5) is sleeved in the guide rail (4) and is used to limit the movement of the pressure rod (1) in the vertical direction when the pressure rod (1) drives the pressure rod (1) to move; The small diameter circular tube (6) is arranged below the transmission block (5) and moves with the movement of the pressure rod (1); The isolation column (7) is connected to the base (8) and the baffle (11).

2. A central soil sample extraction device for measuring the moisture content of soil samples in a ring knife test according to claim 1, characterized in that: The pressure rod (1) of the device is composed of two sections connected by a handle (2) to improve strength. The length is greater than 1.5 times the length of the base to optimize the force-bearing structure.

3. The central soil sample extraction device for measuring the moisture content of soil samples in a ring knife test according to claim 2, characterized in that: The angle between the pressing rod (1) and the connecting rod (3) is greater than 90 degrees during the pressing process.

4. The central soil sample extraction device for measuring the moisture content of soil samples in a ring knife test according to claim 1, characterized in that: The hinged joints of the pressure rod (1), the upper wedge block (10) and the connecting rod (3) form a triangular force transmission mechanism.

5. The central soil sample extraction device for measuring the moisture content of soil samples in a ring knife test according to claim 1, characterized in that: The transmission block (5) moves vertically up and down under the constraint of the guide rail (4).

6. The central soil sample extraction device for measuring the moisture content of soil samples in a ring knife test according to claim 1, characterized in that: The length of the limiting rod (9) is smaller than the height of the ring knife.

7. The central soil sample extraction device for measuring the moisture content of soil samples in a ring knife test according to claim 1, characterized in that: The lower part of the small diameter circular tube (6) is provided with a blade for making it easier to press into the soil. The inside of the small diameter circular tube (6) needs to be polished to reduce friction so that the soil sample is not easily retained inside.

8. The central soil sample extraction device for measuring the moisture content of soil samples in a ring knife test according to claim 1, characterized in that: It also comprises a push rod (12) for pushing out the soil sample in the small diameter tube (6) after the soil sample is taken out of the small diameter tube (6); the isolation column (7) is used to ensure that the positions of the ring knife and the push rod (12) are fixed each time they are inserted.

9. The central soil sample extraction device for measuring the moisture content of soil samples in a ring knife test according to claim 8, characterized in that: The outer shell of the push rod (12) is consistent with the size of the ring cutter, and the diameter of the inner rod is smaller than the inner diameter of the small diameter ring cutter, and the difference does not exceed 1 mm.

10. A method for taking out a central soil sample of a central soil sample taking out device for measuring moisture content of soil samples in a ring knife test according to any one of claims 1 to 9, characterized in that: The specific steps include: Step S1: lift the pressure rod (1); Step S2: Cut the two ends of the ring cutter flat according to the specification requirements and place it on the isolation column (7) of the device; Step S3: the pressure rod (1) is pressed downward to allow the small diameter tube (6) to penetrate the ring cutter soil sample; Step S4: the pressure rod (1) is lifted, and the ring knife is replaced by the push rod (12); Step S5: the pressing rod (1) is pressed downward, so that the pushing rod (12) slowly pushes out the soil; Step S6: Collect soil samples required for the moisture content experiment.

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