A gas-liquid bag type soil sampler

Abstract

The utility model belongs to the drilling technology field, especially relates to a gas -liquid bag formula soil sample sampler. Its technical scheme is: a kind of gas / liquid bag formula extrusion soil sample bottom and sampling tube inner wall increase friction to promote the sampler of soil sample, including sampling tube, annular gas / liquid bag groove is provided on sampling tube inner wall, annular gas / liquid bag groove is provided with annular gas / liquid bag for extruding soil sample bottom and sampling tube inner wall after inflation / liquid, annular gas / liquid bag is connected with inflation / liquid pipe, the other end of inflation / liquid pipe is connected with gas / liquid source device. The utility model provides a kind of gas / liquid bag formula extrusion soil sample bottom and sampling tube inner wall increase friction to promote the sampler of soil sample, can obtain large diameter soil sample, to obtain the center test soil sample of little disturbance, satisfy index test requirement.

Description

Technical Field

[0001] This utility model belongs to the field of drilling technology, and specifically relates to a gas-liquid bladder type soil sampler. Background Technology

[0002] Due to its unique collapsibility, loess requires Class I (undisturbed) soil samples for laboratory testing to assess its collapsibility index. Current drilling techniques primarily use rotary drilling and percussion drilling, with sampling mainly conducted via hammering or static pressure. This method causes significant soil disturbance, and even with samplers conforming to the industry standard "Loess Sampler" (JG / T554-2018), sampling results remain poor due to excessive soil disturbance, limiting its widespread application. Because loess has good wall stability, a loose structure, and is easy to excavate, the current practice in loess areas relies primarily on manually excavated exploratory wells for sampling. These wells are typically 40-50 cm in diameter and range in depth from several meters to tens of meters; however, a well collapse can be fatal, posing a significant safety hazard. To reduce workers' time and labor intensity underground, some exploration units have adopted a loess drilling and sampling method that combines mechanical Luoyang shovels with manual sampling. This involves using a mechanical Luoyang shovel to hammer and create holes, followed by manual sampling. Hammering inherently increases soil disturbance; the closer to the hole wall, the greater the disturbance, and the farther away, the less disturbance. The further the manual horizontal excavation after drilling, the higher the sample quality, but the longer the sampling time. Sampling quality is inversely proportional to work efficiency. Furthermore, the sample quality is difficult to guarantee due to the influence of boom length and hole disturbance. Some loosely structured loess is also prone to hole collapse after mechanical drilling, posing a safety risk.

[0003] To avoid the dangers of manual sampling, we must return to drilling sampling. However, existing soil samplers use hammering, static pressure, or rotary sampling methods, which inevitably disturb the soil sample. The degree of soil sample disturbance decreases from the sample radius towards the center point. As long as we can obtain a soil sample with a sufficiently large diameter while minimizing disturbance, we can obtain a high-quality central soil sample.

[0004] Currently, loess samplers take soil samples with a diameter of 120mm. The laboratory then extracts a test soil sample with a diameter of 79.8mm from the center of the sampler. The test soil sample is about 20mm away from the drilling sample, which is difficult to gain industry acceptance. Manual sampling is still required.

[0005] To obtain large-diameter soil samples, traditional soil samplers rely on the friction between the soil sample and the inner wall of the sampling tube to break the soil sample and overcome its weight. However, the breaking force and weight are proportional to the square of the soil sample diameter, and the friction area is also proportional to the soil sample diameter. Therefore, there is an urgent need for a technology that can increase the friction of the bottom section of the soil sample or cut and support the bottom section of the soil sample without affecting the soil sample in the sampling section, so as to obtain large-diameter soil samples and obtain a central soil sample that meets the requirements for experimental use. Utility Model Content

[0006] In order to solve the above-mentioned problems in the existing technology, the purpose of this utility model is to provide a gas-liquid bladder type soil sampler that can reduce soil sample disturbance.

[0007] The technical solution adopted in this utility model is as follows: A gas / liquid bladder type soil sampler includes a sampling tube with an annular gas / liquid bladder groove on the inner wall of the sampling tube. An annular gas / liquid bladder is provided in the annular gas / liquid bladder groove for squeezing the soil sample and the inner wall of the sampling tube together after inflation with gas or liquid, thereby increasing the friction. The annular gas / liquid bladder is connected to an inflation / liquid tube, and the other end of the inflation / liquid tube is connected to a gas / liquid source device.

[0008] As a preferred embodiment of this utility model, the gas / liquid source device includes a pressurizing device and a negative pressure extraction device, and the gas / liquid filling pipe is connected to the pressurizing device and the negative pressure extraction device respectively through a three-way valve.

[0009] Before sampling, the annular gas / liquid bladder is in an unfilled gas or liquid state. Under the action of the gas / liquid source device and the three-way valve, the annular gas / liquid bladder contracts into the annular gas / liquid bladder groove due to negative pressure, preventing the annular gas / liquid bladder from blocking the soil sample from entering the sampling tube. After the sampler drills in, the soil sample enters the predetermined position inside the sampling tube. The gas / liquid source device inflates the annular gas / liquid bladder with gas or liquid. When the annular gas / liquid bladder expands, it bulges into the inner cavity of the sampling tube, thereby generating a large frictional force between the annular gas / liquid bladder and the soil sample and inner wall through compression, so as to extract the soil sample and prevent it from slipping.

[0010] This invention utilizes an annular gas / liquid bladder to compress the lower soil sample, while the soil sample in the middle section of the sampling tube remains unaffected, resulting in minimal soil sample disturbance. Furthermore, when using large-diameter soil samples, the disturbance to the soil sample center is further reduced, leading to high-quality central soil samples. The minimal soil sample disturbance produced by this invention enables reliable testing of collapsibility indicators and is suitable for loess sampling.

[0011] In a preferred embodiment of this invention, the upper and lower sides of the inner wall of the annular gas / liquid bladder are fixed to the inner wall of the sampling tube. The fixing method is either bonding or pressing the metal ring of the annular gas / liquid bladder. The metal ring limits the position of the annular gas / liquid bladder, ensuring stable inward expansion when the gas / liquid bladder is inflated with gas / liquid, thus ensuring a more stable squeezing effect on the soil sample.

[0012] In a preferred embodiment of this invention, the metal ring is fixed to the inner wall of the sampling tube. The metal ring is supported by the inner wall of the sampling tube, ensuring the stability of the metal ring's position.

[0013] As a preferred embodiment of this utility model, the annular gas / liquid bladder is a single-layer membrane, and the membrane and the inner wall of the sampling tube form a gas chamber. The membrane and the inner wall of the sampling tube are connected by adhesive or pressing.

[0014] As a preferred embodiment of this utility model, a protective tube is provided on the outer wall of the sampling tube, and the gas / liquid tube passes through the protective tube. The wall of the sampling tube is relatively thin and there is no space to provide a vertical hole, so a protective tube for accommodating the gas / liquid tube is provided on the side wall of the sampling tube.

[0015] As a preferred embodiment of this utility model, the edge of the rope hole through which the inflation / liquid tube enters the sampling tube is rounded.

[0016] As a preferred embodiment of this utility model, the gas / liquid source device is installed inside the upper part of the sampling tube, and the upper end of the inflation tube passes through the sampling tube and is connected to the gas / liquid source device. Installing the gas / liquid source device inside the sampling tube avoids the situation where the inflation tube cannot be installed when the gas / liquid source device is placed on the ground.

[0017] As a preferred embodiment of this utility model, a support plate is fixed to the upper part of the sampling tube, and the gas / liquid source device is installed on the support plate.

[0018] As a preferred embodiment of this invention, it also includes a control system, which is electrically or communicatively connected to the gas / liquid source device. The control system controls the gas / liquid source device to achieve timely and accurate control of gas / liquid filling and gas / liquid releasing.

[0019] The beneficial effects of this utility model are as follows: This invention relates to a gas / liquid source device that inflates an annular gas / liquid bladder with either gas or liquid. When the annular bladder expands, it bulges into the sampling tube, creating a strong frictional force between the bladder and the soil sample and inner wall through compression. This allows for the extraction of large-diameter soil samples while preventing slippage. The annular gas / liquid bladder compresses the lower soil sample, leaving the middle section of the sampling tube unaffected, resulting in minimal soil sample disturbance. When extracting large-diameter soil samples, the disturbance to the center is further reduced, leading to high-quality central soil samples. The minimal soil sample disturbance achieved by this invention enables reliable testing of collapsibility indicators and is suitable for loess sampling. Attached Figure Description

[0020] Figure 1 This is a longitudinal sectional view of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a longitudinal sectional view of the present invention when the metal patch is installed; Figure 4 This is a cross-sectional view of the present invention when the metal patch is installed; Figure 5 This is a longitudinal sectional view of the present invention when the curved plate is set; Figure 6 This is a cross-sectional view of the present invention when the curved plate is set; Figure 7 This is a longitudinal sectional view of the present invention when the arc plate is set; Figure 8 This is a cross-sectional view of the present invention when the arc plate is set.

[0021] In the diagram: 1-Sampling tube; 2-Annular gas / liquid bladder; 3-Inflation / liquid tube; 4-Gas / liquid source device; 5-Metal patch; 6-Clamp; 7-Protective tube; 8-Metal ring; 9-Support plate; 11-Annular gas / liquid bladder groove; 61-Notch; 62-Arc plate; 63-Circular arc plate. Detailed Implementation

[0022] 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, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other.

[0024] like Figure 1 and Figure 2 As shown, the air / liquid bladder soil sampler of this embodiment includes a sampling tube 1, an annular air / liquid bladder groove 11 is provided on the inner wall of the sampling tube 1, an annular air / liquid bladder 2 is provided in the annular air / liquid bladder groove 11 for squeezing the soil sample and the inner wall of the sampling tube 1 after being filled with air or liquid to increase the friction, the annular air / liquid bladder 2 is connected to an inflation / liquid tube 3, and the other end of the inflation / liquid tube 3 is connected to an air / liquid source device 4.

[0025] The annular gas / liquid bladder 2 is filled with gas or liquid, the inflation / liquid tube 3 is an inflation tube or an inflation tube, and the gas / liquid source device 4 is a gas source device or a liquid source device. In this embodiment, the annular gas / liquid bladder 2 is filled with gas, the inflation / liquid tube 3 is an inflation tube, and the gas / liquid source device 4 is a gas source device.

[0026] The gas / liquid source device 4 includes a pressurizing device and a negative pressure extraction device, and the gas / liquid filling pipe 3 is connected to the pressurizing device and the negative pressure extraction device respectively through a three-way valve.

[0027] The annular gas / liquid bladder 2 is fixed to the inner wall of the sampling tube 1 on the upper and lower sides by bonding or by pressing with a metal ring 8.

[0028] The metal ring 8 is fixed to the inner wall of the sampling tube 1.

[0029] The annular gas / liquid bladder 2 is a single-layer membrane. The membrane and the inner wall of the sampling tube 1 form a gas chamber. The membrane and the inner wall of the sampling tube 1 are connected by adhesive or pressing.

[0030] Before sampling, the annular gas / liquid bladder 2 is in an unfilled gas or liquid state. Under the action of the gas / liquid source device 4 and the three-way valve, the annular gas / liquid bladder 2 contracts into the annular gas / liquid bladder groove 11 due to negative pressure, preventing the annular gas / liquid bladder 2 from blocking the soil sample from entering the sampling tube 1. After the sampler drills in, the soil sample enters the predetermined position inside the sampling tube 1. The gas / liquid source device 4 inflates the annular gas / liquid bladder 2 with gas or liquid. When the annular gas / liquid bladder 2 expands, it bulges into the inner cavity of the sampling tube 1, thereby generating a large frictional force between the annular gas / liquid bladder 2 and the soil sample and inner wall through squeezing force, so as to extract a large-diameter soil sample and prevent slippage.

[0031] The annular air / liquid bladder 2 of this invention compresses the lower soil sample, while the soil sample in the middle section of the sampling tube 1 remains unaffected, resulting in minimal disturbance to the soil sample. When using a large-diameter soil sample, the disturbance to the soil sample in the center is further reduced, leading to a high-quality central soil sample. This invention minimizes soil sample disturbance, reliably tests collapsibility indices, and is suitable for sampling loess.

[0032] The annular air / liquid bladder 2 squeezes the soil sample tightly against the inner wall of the sampling tube 1, increasing the friction and supporting the lower part of the soil sample. The soil sample will not slip relative to the sampling tube 1, making it easy to lift the soil sample out through the sampling tube 1.

[0033] Furthermore, the annular gas / liquid bladder 2 has metal rings 8 connected to both the upper and lower sides of its inner wall to block it. The metal rings 8 limit the movement of the annular gas / liquid bladder 2, ensuring that it expands stably inward when inflated, thus ensuring a more stable compression effect on the soil sample.

[0034] The metal ring 8 is fixed to the inner wall of the sampling tube 1. The metal ring 8 is supported by the inner wall of the sampling tube 1, ensuring the stability of the position of the metal ring 8.

[0035] Furthermore, a protective tube 7 is provided on the outer wall of the sampling tube 1, and the inflation / liquid tube 3 passes through the protective tube 7. The wall of the sampling tube 1 is relatively thin and there is no space to set a vertical hole, so a protective tube 7 is provided on the side wall of the sampling tube 1 to accommodate the inflation / liquid tube 3. The edge of the rope hole through which the inflation / liquid tube 3 passes into the sampling tube 1 is rounded.

[0036] To facilitate the installation of the gas / liquid source device 4, the gas / liquid source device 4 is installed inside the upper part of the sampling tube 1, and the upper end of the inflation pipe 3 passes through the sampling tube 1 and connects to the gas / liquid source device 4. The gas / liquid source device 4 is installed inside the sampling tube 1 to avoid the situation where the inflation pipe 3 cannot be installed when the gas / liquid source device 4 is set on the ground.

[0037] A support plate 9 is fixed to the upper part of the sampling tube 1, and the gas / liquid source device 4 is installed on the support plate 9.

[0038] This invention also includes a control system, which is electrically or communicatively connected to the gas / liquid source device 4. The control system controls the gas / liquid source device 4 to achieve timely and accurate control of gas / liquid filling and gas / liquid release.

[0039] Furthermore, such as Figures 3 to 8 As shown, the inner wall of the annular air / liquid bladder 2 is connected to a compression structure for compressing the soil sample. The compression structure on the annular air / liquid bladder 2 ensures reliable compression of the soil sample and prevents hard objects in the soil sample from puncturing the annular air / liquid bladder 2.

[0040] Extrusion structures include, but are not limited to, the following forms: The first type: such as Figure 3 and Figure 4 As shown, the compression structure includes several metal patches 5, which are connected to the inner wall of the annular gas / liquid bladder 2. The metal patches 5 directly compress the soil sample, and the soil sample is compacted by the metal patches 5, which can increase the friction on the soil sample.

[0041] Several metal patches 5 are spaced apart. During the expansion or contraction of the annular gas / liquid bladder 2, the spacing between adjacent metal patches 5 will change. By reserving gaps, interference between adjacent metal patches 5 is avoided.

[0042] Several metal patches 5 are evenly distributed on the inner wall of the annular gas / liquid bladder 2.

[0043] The second type: The compression structure includes a clamp 6, which is connected to the inner wall of the annular gas / liquid bladder 2. The clamp 6 has at least one notch 61. Before sampling, the clamp 6 is in a relaxed state. After the sampler drills in, the soil sample enters the sampling tube 1, the annular gas / liquid bladder 2 is inflated, and the clamp 6 tightens, thereby squeezing the soil sample and the inner wall of the sampling tube, increasing the friction.

[0044] like Figure 5 and Figure 6 As shown, the clamp 6 includes two arc-shaped plates 62, which are connected to the inner wall of the annular gas / liquid bladder 2. The two gaps between the two arc-shaped plates 62 form two notches 61. When the annular gas / liquid bladder 2 is inflated, the two ends of the arc-shaped plates 62 move towards the center of the sampling tube 1, thereby compressing the soil sample.

[0045] like Figure 7 and Figure 8 As shown, the clamp 6 includes a single arc plate 63 with a notch 61 on it. When the annular gas / liquid bladder 2 is inflated, the notch 61 of the arc plate 63 becomes smaller, and its inner diameter also decreases, thereby compressing the soil sample.

[0046] This utility model is not limited to the above-mentioned optional embodiments. Anyone can derive other forms of products under the guidance of this utility model. However, regardless of any changes made in its shape or structure, any technical solution that falls within the scope of the claims of this utility model shall be protected by this utility model.

Claims

1. A gas-liquid bladder type soil sampler, characterized in that: It includes a sampling tube (1), an annular gas / liquid bladder groove (11) is provided on the inner wall of the sampling tube (1), an annular gas / liquid bladder (2) is provided in the annular gas / liquid bladder (11) to squeeze the soil sample after being filled with gas or liquid, the annular gas / liquid bladder (2) is connected to an inflation tube (3), and the other end of the inflation tube (3) is connected to a gas / liquid source device (4).

2. The gas-liquid bladder type soil sampler according to claim 1, characterized in that: The gas / liquid source device (4) includes a pressurizing device and a negative pressure extraction device. The gas / liquid filling pipe (3) is connected to the pressurizing device and the negative pressure extraction device respectively through a three-way valve.

3. The gas-liquid bladder type soil sampler according to claim 1, characterized in that: The annular gas / liquid bladder (2) is fixed to the inner wall of the sampling tube (1) on the upper and lower sides by bonding or by pressing with a metal ring (8).

4. The gas-liquid bladder type soil sampler according to claim 3, characterized in that: The metal ring (8) is fixed to the inner wall of the sampling tube (1).

5. The gas-liquid bladder type soil sampler according to claim 1, characterized in that: The annular gas / liquid bladder (2) is a single-layer membrane. The membrane and the inner wall of the sampling tube (1) form a gas chamber. The membrane and the inner wall of the sampling tube (1) are connected by adhesive or pressing.

6. The gas-liquid bladder type soil sampler according to claim 1, characterized in that: The outer wall of the sampling tube (1) is provided with a protective tube (7), and the gas / liquid tube (3) is inserted in the protective tube (7).

7. A gas-liquid bladder type soil sampler according to claim 6, characterized in that: The edge of the rope hole of the inflatable / liquid tube (3) inserted into the sampling tube (1) is rounded.

8. The gas-liquid bladder type soil sampler according to claim 1, characterized in that: The gas / liquid source device (4) is installed in the upper part of the sampling tube (1), and the upper end of the gas / liquid filling tube (3) is inserted into the sampling tube (1) and connected to the gas / liquid source device (4).

9. A gas-liquid bladder type soil sampler according to claim 8, characterized in that: The upper part of the sampling tube (1) is fixed with a support plate (9), and the gas / liquid source device (4) is installed on the support plate (9).

10. A gas-liquid bladder type soil sampler according to any one of claims 1 to 9, characterized in that: It also includes a control system, which is electrically or communicatively connected to the gas / liquid source device (4).

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