Sampling method in closed box body

Abstract

The invention provides a sampling method in a closed box body, which comprises the following steps: moving a sampling device to a closed box filled with a material to be sampled, and enabling the working direction of a drill rod to face the closed box; opening an opening in the top of the closed box, drilling by using a drill rod with a pile casing, putting the pile casing into the hole after drilling, enabling the pile casing to be in contact with the wall of the hole, rotating the pile casing, fixing the pile casing in the hole, and extracting a sample; along the periphery of the sample, a cutting ring on the periphery of the sample is fixed through a fixer on the sampling device, and stratified sampling of different positions of the sample in the closed box is carried out. The grouting model test sampling device which is easy to install and mechanically controlled is matched, so that materials at different positions and different depths in the closed box can be sampled under the condition that the grouting process and the whole sample are not damaged, the problem of sampling difficulty in the prior art is solved, and the sampling efficiency is improved. And the accuracy of grouting effect evaluation and the deepness of research are improved.

Description

Technical Field

[0001] The invention relates to the technical field of sampling before grouting for performance testing, in particular to a sampling method in a closed box. Background Art

[0002] In the field of foundation engineering, grouting technology is widely used to solve problems such as water inrush in tunnels, reinforcement of broken surrounding rocks in tunnels, and repair of concrete cracks. However, the research on grouting materials requires actual simulation on site. Due to the complexity of the engineering environment, indoor test simulation becomes particularly important. Closed box simulation is an important means to study the diffusion of slurry and the strength of stone bodies, but sampling in a closed box has always been a technical problem. In the prior art, sampling usually requires pre-embedded sampling parts, which will affect the diffusion of slurry. In addition, there is still a blank in the research on sampling equipment at different heights and different radii, which limits the evaluation and research of grouting effects. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a sampling method in a sealed box. By cooperating with a simple-to-install, mechanically controlled grouting model test sampling device, it is possible to sample materials in the sealed box at different positions and depths without destroying the grouting process and the overall sample, thereby solving the problem of sampling difficulty in the prior art and improving the accuracy of grouting effect evaluation and the depth of research.

[0004] In order to solve the above technical problems, the technical solutions provided by the present invention are as follows: The sampling method in a closed box comprises the following steps: Move the sampling device to a closed box filled with the material to be sampled, with the working direction of the drill rod facing the closed box; Open the top opening of the sealed box, use a drill rod with a casing to drill a hole, and after drilling, put the casing into the hole so that the casing contacts the hole wall, rotate the casing to fix it in the hole and extract the sample; Along the periphery of the sample, the ring knife on the periphery of the sample is fixed by a fixture on the sampling device to perform layered sampling at different positions of the sample in the closed box.

[0005] Furthermore, the stratified sampling specifically involves extracting the sample, exposing multiple layers of sample separated by a stratified ring knife, and after the ring knife is fixed by a fixer, the stratified sample is obtained by a divider.

[0006] Furthermore, in the drilling step, the drilling is performed downwards by the drill rod, and the ring cutter performs synchronous segmentation for cutting and sampling.

[0007] Furthermore, the step of moving the sampling mobile device to the closed box filled with the material to be sampled is specifically to make the sampling mobile device located outside the closed box through a pulley, and the sampling device forms an enclosure cavity so that the periphery of the closed box is enclosed.

[0008] Furthermore, it also includes the assembly of the sampling device, specifically, the assembly-type frame is formed by assembling the assembly parts, and the pulley is fixed in a manner of partially embedding the bottom of the frame into a fixed box.

[0009] Furthermore, the drill rod is located in the frame, and the drill rod moves horizontally along the inner wall of the frame to approach or move away from the closed box.

[0010] Furthermore, a plurality of cutters are connected to the bottom of the drill pipe via a connecting rod, and the casing is located outside the cutters.

[0011] Furthermore, it also includes a lifting mechanism which is slidably assembled on the frame and moves in the same direction as the drill rod, and the lifting mechanism is connected to a plurality of fixers for fixing the ring cutter.

[0012] Furthermore, the extraction of samples is specifically carried out by lifting the drill rod and the casing, so that the samples in the closed box can be extracted and separated from the closed box.

[0013] Furthermore, it also includes evaluation after sampling, specifically marking samples at different positions, pre-processing, and conducting mechanical property tests and microstructure analysis on each sample to evaluate whether the sample meets the requirements.

[0014] The present invention has the following beneficial effects: The present invention, by cooperating with a simple-to-install, mechanically controlled grouting model test sampling device, can sample materials in a closed box at different positions and depths without destroying the grouting process and the overall sample, thereby solving the problem of difficult sampling in the prior art and improving the accuracy of grouting effect evaluation and the depth of research. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A flow chart of a sampling method in a closed box provided by the present invention; Figure 2 One of the structural schematic diagrams of the sampling device provided by the present invention; Figure 3 The second structural schematic diagram of the sampling device provided by the present invention; Figure 4 A schematic structural diagram of the ring knife mechanism provided by the present invention; Figure 5 A schematic diagram of the structure of the connecting rod provided by the present invention; Figure 6 An assembly diagram of the ring knife mechanism provided by the present invention; Figure 7 A schematic diagram of the structure of the casing provided by the present invention; Figure 8 A schematic diagram of the structure of the ring cutter connection hole provided by the present invention; Fig. 9 A schematic diagram of the structure of the sampling drill bit provided by the present invention; In the figure: 1. Sliding mechanism; 2. First fixed rod; 3. Drill rod; 4. Assembly rod; 5. Sealed box; 6. Fixed box; 7. Pulley; 8. Second fixed rod; 9. Telescopic rod; 10. Connecting cover; 11. Upper ring cutter; 12. Middle ring cutter; 13. Middle and lower ring cutters; 14. Lower ring cutter; 15. Upper ring cutter fixer; 16. Middle ring cutter fixer; 17. Middle and lower ring cutter fixer; 18. Lower ring cutter fixer; 19. Connecting rod; 20. Connecting rod fixer; 21. Drill bit; 22. Drill bit fixer; 23. Casing fixing cover; 24. Casing; 25. Ring cutter connecting hole; 27. Fixed arm. DETAILED DESCRIPTION

[0016] The present invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

[0017] Refer to the attached Figure 1 As shown, when the sampling method is performed in a closed box, the core steps are as follows: the sampling device is moved to the closed box filled with the material to be sampled, and the working direction of the drill rod is toward the closed box; Open the top opening of the sealed box, use a drill rod with a casing to drill a hole, and after drilling, put the casing into the hole so that the casing contacts the hole wall, rotate the casing to fix it in the hole and extract the sample; Along the periphery of the sample, the ring knife on the periphery of the sample is fixed by a fixture on the sampling device to perform layered sampling at different positions of the sample in the closed box.

[0018] The specific steps are described as follows: Step 1: Construct the mobile sampling device in this embodiment, including a pulley mechanism 1, a fixed box 6, an assembly rod 4 composed of fixed vertical rods, a sliding top rod, a fixed rod, a drill rod 3 and a closed box 5, etc., to achieve free movement and positioning of the device.

[0019] In this embodiment, a flexible mobile device system is specifically constructed. The system consists of the following key components: a pulley 7, which is used to control the free movement of the entire device in the horizontal direction; a fixed box 6, which serves as the basic support structure of the device; a fixed vertical rod (i.e., an assembly rod 4), which provides vertical support for the sliding top rod; a sliding top rod (i.e., a sliding mechanism 1), which cooperates with the fixed vertical rod and the fixed box to accurately control the vertical movement of the sampling device; a fixed rod, which connects the sliding top rod and the drill rod to ensure the stability of the drill rod; the drill rod, which carries the sampling device for rotary drilling operations; and a closed box, which simulates the grouting environment in actual engineering.

[0020] The specific operation steps are as follows: First, the device is accurately positioned next to the closed box by moving the pulley. Then, the vertical movement function of the sliding top rod is used in conjunction with the fixed vertical rod to move the sampling device to the predetermined sampling position in the closed box. During this process, the fixed rod ensures the stability of the drill rod and provides accurate position guarantee for subsequent sampling operations.

[0021] This embodiment ensures that the device can reach different locations for sampling accurately and non-destructively during the entire sampling process.

[0022] During the implementation process, the operator first adjusts the pulley to the appropriate position to ensure that the device can be smoothly moved to one side of the closed box. Then, by adjusting the sliding top rod, the sampling device is accurately positioned to the depth and position in the box where sampling is required. In this way, the drill rod can be driven by the power system to rotate and drill, thus starting the sampling work.

[0023] The second step is to design the sampling device, including the sampling connecting rod, ring knife, casing, drill bit, telescopic rod, fixed Rod, connection Rod, connecting rod holder and layered ring knife holder for precise sampling.

[0024] The core components of the device in this embodiment include: a sampling connecting rod, which is used to firmly connect the sampling device to the drill rod; a ring cutter with a multi-layer structure design, which is used to cut and remove samples; a casing, which protects the soil around the borehole to prevent collapse; a drill bit, which is used to drill holes in a closed box; a telescopic rod and a fixed rod, which are used together to adjust and fix the position of the sampling device; a connecting rod, which connects the ring cutter and the fixer to ensure the stability of the ring cutter; a connecting rod fixer, which is used to fix the connecting rod to ensure the accuracy of sampling; and a layered ring cutter fixer, which is used to fix and separate multiple layers of ring cutters to remove samples at different depths.

[0025] During the operation, a hole is first drilled in a closed box using a drill bit, and then a casing is placed in the hole to protect the hole wall. Next, the position of the sampling device is adjusted by the telescopic rod and the fixed rod to ensure that the ring knife is aligned with the desired sampling layer. The sampling connecting rod transmits power to the ring knife, causing it to rotate and cut into the concrete to form a sample. By loosening the connecting rod holder and operating the layered ring knife holder, samples of different depths can be taken out layer by layer.

[0026] In actual implementation, the operator first aligns the drill bit with the predetermined sampling point and starts the power system to drill. After the hole is drilled, the casing is quickly placed into the hole to maintain the stability of the hole. Then, the telescopic rod and the fixed rod are adjusted to move the sampling device to the appropriate position. While the ring knife rotates and cuts, pressure is gradually applied to make the ring knife penetrate into the material to complete the sampling. Finally, by using the layered ring knife holder and the connecting rod holder, the samples are taken out layer by layer for subsequent experimental analysis.

[0027] The third step is to use casing to surround the borehole before drilling and sampling to prevent the surrounding soil from collapsing or shrinking.

[0028] This mainly involves the preliminary preparation work for drilling sampling, that is, using casing to surround the borehole. The purpose of this step is to protect the soil around the borehole during the sampling process and prevent the soil from collapsing or shrinking due to the sampling operation, thereby ensuring the accuracy of sampling and the integrity of the overall sample.

[0029] The specific operation in this step is as follows: after the drill bit 21 drills the hole, the casing 24 is immediately inserted into the hole. The designed length and diameter of the casing can just match the size of the hole to ensure that it can be firmly fixed in the hole. The space formed between the outer wall of the casing and the hole wall can effectively isolate the direct impact of the drilling operation on the surrounding soil and maintain the stability of the hole wall.

[0030] In actual operation, firstly, a casing of appropriate size is selected according to the material of the closed box 5 and the depth of the borehole. After the drill bit completes the drilling, the operator carefully puts the casing into the hole to ensure that the contact between the casing and the hole wall is uniform and there is no gap. Then, the casing is firmly fixed in the hole by lightly tapping or rotating it. In this way, in the subsequent sampling process, even if multiple samplings are performed at different depths and positions, the casing can effectively protect the hole wall, prevent soil collapse or shrinkage, and ensure the smooth progress of the sampling work.

[0031] The fourth step is to adjust the sampling position through the layered ring knife fixture, and realize the layered removal of the sample by raising the connecting rod and the divider.

[0032] In the sampling process, in order to achieve accurate extraction of samples at different depths, this embodiment adopts the following detailed steps: 1) Adjust the sampling position: First, the operator uses the layered ring knife holder to adjust the sampling device to the predetermined sampling depth through the cooperation of the telescopic rod and the fixed rod. The design of the layered ring knife holder allows it to move freely on the sliding top rod and fine-tune the height through the telescopic rod to ensure the accuracy of the sampling position.

[0033] 2) Sampling operation: After adjusting the sampling position, start the power system to make the drill rod drive the sampling device to rotate and drill into the material. At this time, the ring cutter starts to cut and form the sample.

[0034] For the specific layered sample removal, in this embodiment, after the drilling is completed, the operator loosens the connecting rod fixture at the bottom, and the sample in the layered ring cutter is ready to be taken out. The entire sampling device is fixed in an appropriate position by the layered ring cutter fixture, and then the connecting rod is slowly pulled out to gradually separate the multi-layer ring cutters.

[0035] As for the splitting of the sample, in this embodiment, as the connecting rod 19 is raised, a splitter is used to split the sample in the ring knife into multiple parts, each part corresponding to a different depth level.

[0036] In this embodiment, when implementing stratified sampling, the operator first adjusts the stratified ring cutter holder to the corresponding position according to the depth of sampling required. Then, the power system drives the drill rod and the ring cutter to rotate and drill to form a sample. After drilling is completed, the connecting rod holder is loosened and the connecting rod is raised. At this time, the sample in the stratified ring cutter is separated as the connecting rod is raised. Finally, the splitter is used to split and take out the sample of each layer, completing the entire stratified sampling process.

[0037] In this embodiment, the formula for stratified sampling is as follows: Among them, h represents the thickness of each layer of the sample, D is the diameter of the ring knife, n is the number of ring knife layers, and k is the number of layers currently sampled.

[0038] In this embodiment, the above method can not only achieve accurate sampling of concrete in a closed box, but also ensure that the integrity of the overall sample is not destroyed while sampling at different depths and positions, thereby providing accurate samples for evaluating the grouting effect.

[0039] The fifth step is to evaluate the grouting effect of the taken samples.

[0040] In actual operation, after the samples are successfully taken out, the next step is to conduct a detailed evaluation of the grouting effect on these samples. The evaluation process mainly includes the following steps: Sample preparation: First, mark the samples taken out from each layer to ensure that each sample can accurately correspond to its original depth and position. Then, the samples are properly processed, such as removing surface impurities, measuring dimensions and weight, etc., to prepare for subsequent experimental analysis.

[0041] Mechanical properties test: Place the processed samples on professional testing equipment for compression strength test. Record the compressive strength of the samples, which is one of the important indicators for evaluating the grouting effect.

[0042] Microstructure analysis: Use microscopic analysis tools such as scanning electron microscope to observe the internal structure of the sample, analyze the bonding between the slurry and aggregate, and the uniformity of the slurry distribution.

[0043] Data analysis: Conduct statistical analysis on the test data to compare the differences between samples at different depths and locations, as well as compare with standard values ​​or design requirements.

[0044] When evaluating the grouting effect, first ensure that all samples are correctly marked and prepared. Next, use a pressure testing machine to test the compressive strength of the samples and record the compressive strength value of each sample. Then, use a scanning electron microscope to observe the internal structure of the sample and analyze the combination of slurry and aggregate. Finally, through data analysis, evaluate whether the grouting effect meets the expected goals.

[0045] This evaluation process not only provides a scientific basis for the control of grouting quality, but also helps to optimize grouting materials and construction parameters, and improve the overall effect of grouting operations in future projects.

[0046] The grouting model test sampling device and use method provided in the present invention can effectively solve the problem of sampling in a closed box, improve the accuracy and efficiency of sampling, and are of great significance for the evaluation and research of grouting effects.

[0047] Refer to the attached Figure 2-9 As shown, in order to implement the sampling method, the present embodiment further provides a sampling device for grouting model test, including a moving mechanism and a ring knife mechanism connected by a connecting mechanism, the moving mechanism includes an assembly frame, and the assembly frame is respectively connected with a drill rod 3 and the ring knife mechanism by a sliding mechanism 1; in the present embodiment, in order to implement sampling at multiple positions, a plurality of layers of ring knives are arranged on the ring knife mechanism, such as the upper ring knife 11, the middle ring knife 12, the middle and lower ring knife 13, and the lower ring knife 14 in the present embodiment. The ring knives are partially connected at the side by a connecting rod 19 to form a whole, and then a drill bit 21 is connected to the lower ring knife 14 at the bottom layer.

[0048] In order to provide protection before the ring cutter sampling, a casing 24 is further included, and the drill bit 21 forms a working range along the bottom of the casing 24 and around it.

[0049] In order to carry out sampling, the present embodiment also includes a closed sealed box 5 located below the assembly frame. After the drill bit completes the drilling sampling along the closed box 5, the ring cutter is used to sample several different heights in the drilling sample. At this time, the entire sampling is completed, and then the drill rod is sampled as a whole, and then sampling at different heights is carried out on the whole.

[0050] In this embodiment, the connection mechanism is a connection cover 10, and at least four groups of connection rods 19 are arranged on the inner wall of the connection cover 10 along the circumferential direction. The bottom of the connection rod 19 is connected to a drill bit 21 through a connection rod fixer. With this arrangement, the ring cutter can be connected and fixed at multiple locations, and the connectivity is stronger.

[0051] In this embodiment, in order to increase the drilling effect, a drill bit holder 22 is provided near the bottom ring cutter through a drill rod, and the connecting rod 9 and the drill bit 21 at the bottom ring cutter are fixed at the drill bit holder 22 to form an inward drilling direction.

[0052] In order to protect the casing 24 and the connection cover 10 , a casing fixing cover 23 is further included between the connection cover 10 and the casing 24 , and the casing fixing cover 23 is fixedly connected to the connection cover 10 .

[0053] In order to adjust the overall height of the sampling, the ring knife mechanism includes a telescopic rod 9 connected to the sliding mechanism through a fixed rod, and the telescopic rod 9 is provided with a plurality of ring knife fixers corresponding to the ring knives, and the number of ring knife fixers corresponds to the number of ring knife layers.

[0054] In order to facilitate assembly, the telescopic rod 9 and the ring knife holder are vertically arranged, and the ring knife holder is located at the telescopic rod 9 with the smallest diameter at the bottom.

[0055] Specifically, the sliding mechanism is a sliding top rod 1 located at the top of the assembly frame, and the sliding top rod moves horizontally along the inner wall of the assembly frame to adjust the sampling position in the horizontal direction.

[0056] Specifically, the assembly rack is assembled by assembling rods 4, and the sliding top rod is located inside the assembling rods 4. Then, a pulley 7 for moving the assembly rack is assembled at the bottom of the assembly rack through a fixed box 6.

[0057] like Figure 2-3 , which is a schematic diagram of the whole sampling device for grouting model test, which is composed of a moving device and a sampling device. The two parts are mainly connected by a connecting cover 10.

[0058] The mobile device system mainly consists of a sliding mechanism 1 composed of a sliding top rod, a first fixed rod 2, a drill rod 3, an assembly rod 4, a closed box 5, a fixed box 6, a pulley 7, a second fixed rod 8, a telescopic rod 9, and a fixed arm 27. The main working principle of the mobile device is that the pulley 7 controls the movement of the entire device, and the sliding top rod is connected to the first fixed rod 2, the first fixed rod 2 is connected to the drill rod 3, and the drill rod 3 controls the sampling device to drill holes and take samples. At the same time, the sliding top rod is connected to the second fixed rod 8, the second fixed rod 8 is connected to the telescopic rod 9, and the telescopic rod controls the ring knife fixer on the fixed arm 27 to fix the ring knife.

[0059] The sampling device system is mainly composed of a connecting cover 10, an upper ring knife 11, a middle ring knife 12, a middle and lower ring knife 13, a lower ring knife 14, an upper ring knife fixer 15, a middle ring knife fixer 16, a middle and lower ring knife fixer 17, a lower ring knife fixer 18, a connecting rod 19, a connecting rod fixer 20, a drill bit 21, a drill bit fixer 22, a casing fixing cover 23, a casing 24, a ring knife connecting hole 25, and a drill bit 26. The working principle of the sampling device is mainly to set a connection cover 10 on the drill pipe 3, and the upper ring cutter 11, the middle ring cutter 12, the middle and lower ring cutter 13, the lower ring cutter 14, and the drill bit holder 22 are connected to the connection cover 10. The upper ring cutter 11, the middle ring cutter 12, the middle and lower ring cutter 13, the lower ring cutter 14, and the drill bit holder 22 are fixed by a connecting rod 19, and the connection is connected through the connection of the ring cutter connection hole 25 on the ring cutter. The upper part of the connecting rod 19 is connected to the connection cover 10, and the lower part is connected to the connecting rod holder 20, and the connection between the upper and lower parts can be disassembled. The upper ring cutter 11, the middle ring cutter 12, the middle and lower ring cutter 13, the lower ring cutter 14, and the drill bit holder 22 can be tightly connected together through the upper and lower fixed connection. The drill bit holder 22 and the connecting rod holder 20 are both fixed with a drill bit 21, and the drilling sampling is performed under the rotation of the drill pipe 3.

[0060] When the drilling sample is extracted, the upper ring knife holder 15, the middle ring knife holder 16, the middle and lower ring knife holder 17, and the lower ring knife holder 18 are adjusted by sliding the top rod, the second fixing rod 8, and the telescopic rod 9, so that the upper ring knife holder 15 is fixed on the upper ring knife 11, the middle ring knife holder 16 fixes the middle ring knife 12, the middle and lower ring knife holder 17 fixes the middle and lower ring knife 13, and the lower ring knife holder 18 fixes the lower ring knife 14, and then loosen the connection cover 10 and the connecting rod holder 20, pull out the connecting rod 19, and then divide the samples with different ring knives through the pores between the ring knives. In this way, samples of different depths at the same position are extracted. The working principle of the casing fixing cover 23 and the casing 24 is mainly to connect the casing fixing cover 23 to the drill rod 3 and then perform drilling, but there is no need to lift the casing because the size of the casing needs to be larger than the size of the upper ring cutter, the middle ring cutter, the middle and lower ring cutter, the lower ring cutter, and the drill bit holder, so as to protect the test materials around the sample after sampling.

[0061] The operation process of simulating the anti-scouring performance under different roughness of the present invention is as follows: First, adjust the position of the entire device by using the pulley 7; Further, the casing fixing cover 23 is connected to the drill pipe 3 through the power center, and the casing 24 is adjusted to be installed on the outer diameter of the sampling position; Further, the upper ring cutter 11, the middle ring cutter 12, the middle and lower ring cutter 13, the lower ring cutter 14, and the drill bit holder 22 are fixed by the connecting cover 10, the connecting rod 19 and the connecting rod holder 20; Further, the installed cutter ring is connected to the drill rod 3 through the connecting cover 10. Further, through the power system, drilling and sampling are carried out along the 24 casing, and extraction is carried out after the drilling is completed; Further, the power system is used to control the upper ring knife holder 15, the middle ring knife holder 16, the middle and lower ring knife holder 17, and the lower ring knife holder 18 to move to the layered ring knife lifted out by sampling, and the fixing arm 27 on the telescopic rod 9 is adjusted to fix the upper ring knife 11 with the upper ring knife holder 15, the middle ring knife holder 16 fixes the middle ring knife 12, the middle and lower ring knife holder 17 fixes the middle and lower ring knife 13, and the lower ring knife holder 18 fixes the lower ring knife 14; During use, the connecting rod 19 is extracted by loosening the connecting cover 10 and the connecting rod holder 20; Further, the samples between the upper ring cutter 11, the middle ring cutter 12, the middle and lower ring cutter 13, and the lower ring cutter 14 are divided by a divider, so as to take out the sample soil samples at different depths at the same position; Finally, repeat the above steps and take soil samples from another location.

[0062] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0063] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A sampling method in a closed box, characterized in that: The following steps are included: Move the sampling device to a closed box filled with the material to be sampled, with the working direction of the drill rod facing the closed box; Open the top opening of the sealed box, use a drill rod with a casing to drill a hole, and after drilling, put the casing into the hole so that the casing contacts the hole wall, rotate the casing to fix it in the hole and extract the sample; Along the periphery of the sample, the ring knife on the periphery of the sample is fixed by a fixture on the sampling device to perform layered sampling at different positions of the sample in the closed box.

2. The sampling method in a closed box according to claim 1, characterized in that: The stratified sampling specifically involves extracting samples, exposing multiple layers of samples separated by a stratified ring knife, fixing the ring knife with a fixer, and then dividing the samples with a divider to obtain stratified samples.

3. The sampling method in a closed box according to claim 1, characterized in that: In the drilling step, specifically, the drilling is performed downwards by the drill rod, and the ring cutter synchronously divides and performs cutting sampling.

4. The sampling method in a closed box according to claim 1, characterized in that: The step moves the sampling moving device to the closed box filled with the material to be sampled, specifically by using a pulley to position the sampling moving device outside the closed box, and the sampling device forms an enclosure cavity, so that the periphery of the closed box is enclosed.

5. The sampling method in a closed box according to claim 4, characterized in that: It also includes the assembly of the sampling device, specifically, the assembly-type frame is formed by assembling the assembly parts, and the pulley is fixed in a manner of partially embedding the bottom of the frame into a fixed box.

6. The sampling method in a closed box according to claim 5, characterized in that: The drill rod is located in the frame, and the drill rod moves horizontally along the inner wall of the frame to approach or move away from the closed box.

7. The sampling method in a closed box according to claim 5, characterized in that: The bottom of the drill pipe is connected with a plurality of ring cutters through a connecting rod, and the casing is located outside the ring cutters.

8. The sampling method in a closed box according to claim 7, characterized in that: It also includes a lifting mechanism which is slidably assembled on the frame and moves in the same direction as the drill rod. The lifting mechanism is connected with a plurality of fixers for fixing the ring cutters.

9. The sampling method in a closed box according to claim 1, characterized in that: The sample extraction is specifically performed by lifting the drill rod and the casing, so that the sample in the closed box can be extracted and separated from the closed box.

10. The sampling method in a closed box according to claim 1, characterized in that: It also includes evaluation after sampling, specifically marking samples at different locations, pre-processing, and conducting mechanical property tests and microstructure analysis on each sample to evaluate whether the sample meets the requirements.

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