Arc-shaped cutting blade type double-pipe shallow undisturbed soil sampler

Abstract

The invention provides an arc-shaped cutting blade type double-pipe shallow undisturbed soil sampler. The arc-shaped cutting blade type double-pipe shallow undisturbed soil sampler comprises an outer sleeve, an inner sleeve soil sampler, an arc-shaped cutting blade and an annular drill bit, a rotary drilling disc is arranged at the upper end of the outer sleeve, and an annular drill bit is arranged at the lower end of the outer sleeve. The inner sleeve soil sampler is arranged in the outer sleeve through a rotating rolling shaft; a downward-pressing vertical rod is arranged between the inner wall of the outer sleeve and the outer wall of the inner sleeve soil sampler, one end of the downward-pressing vertical rod extends out of the outer sleeve, and the other end of the downward-pressing vertical rod is used for being hinged to the arc-shaped cutting blade; the inner diameter of the annular drill bit is larger than the outer diameter of the inner sleeve soil sampler and smaller than the inner diameter of the outer sleeve; chamfers corresponding to cutting edges of the arc-shaped cutting blades are arranged on the inner wall of the joint of the annular drill bit and the outer sleeve. According to the soil sampler, the outer sleeve can rotate while the inner sleeve soil sampler is immovable, and interference on undisturbed soil can be effectively reduced. And the undisturbed soil at the lower opening of the soil sampler can be quickly cut.

Description

Technical Field

[0001] This invention belongs to the fields of environmental engineering, geological engineering, and geotechnical engineering. Specifically, it relates to an arc-shaped cutting blade type double-tube shallow undisturbed soil sampler. Background Technology

[0002] One of the main tasks of drilling in environmental engineering, geological engineering, and geotechnical engineering is to collect undisturbed soil or core samples from soil and rock layers. During sample collection, the natural structure of the sample should be preserved; if the natural structure of the sample is disrupted, it is called a "disturbed sample." Disturbed samples lack the accuracy of undisturbed soil samples in environmental engineering and engineering geological exploration.

[0003] Uncirculated specimens with natural structures include core specimens and soil specimens. The natural structure of core specimens is generally not easily damaged, while soil specimens are easily disturbed, especially for loose sandy soil layers. Soil sampling equipment often struggles to obtain intact undisturbed sandy soil specimens, and the collection of undisturbed sandy soil specimens is crucial for understanding the physical properties of soil layers and the properties of aquifers.

[0004] Existing undisturbed sampling equipment for loose soil structures, such as CN106248420A, is a double-tube rotary blade locking sand sampler, comprising an outer tube, an inner sampling tube, a cutting ring, and a rotary blade disc. Before use, the rotary blade disc is opened. During excavation, the outer tube and the inner sampling tube move synchronously. Once the inner sampling tube is filled with undisturbed sandy soil sample, it is fixed in place. Rotating the outer tube clockwise causes the rotary blades to extend, forming a closed rotary blade disc that seals the undisturbed sandy soil sample within the inner sampling tube, thus obtaining the undisturbed sandy soil sample. However, using a rotating rotary blade method is prone to problems during use, as the soil layer can prevent the blades from extending smoothly, thus failing to guarantee the acquisition of the undisturbed sample.

[0005] Therefore, there is an urgent need to develop and improve undisturbed soil sampling equipment for loose soil structures. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing undisturbed soil sampling equipment for loose soil structures by proposing an arc-shaped cutting blade type double-tube shallow undisturbed soil sampler, the specific solution of which is as follows: This invention provides a double-tube shallow undisturbed soil sampler with an arc-shaped cutting blade, comprising: an outer sleeve, an inner sleeve sampler, an arc-shaped cutting blade, and a ring-shaped drill bit; The upper end of the outer sleeve is provided with a rotating drilling disk, and the lower end is provided with an annular drill bit; The inner sleeve soil sampler is installed inside the outer sleeve by a rotating roller, so that the inner sleeve soil sampler remains stationary when the outer sleeve is drilling and sampling soil. A downward pressing vertical rod is provided between the inner wall of the outer sleeve and the outer wall of the inner sleeve soil sampler. One end of the downward pressing vertical rod extends out of the outer sleeve, and the other end is used to hinge the arc-shaped cutting blade. This allows the arc-shaped cutting blade to be concealed between the inner wall of the outer sleeve and the outer wall of the inner sleeve soil sampler when the outer sleeve is drilling to extract soil. After soil extraction is completed, the arc-shaped cutting blade cuts the soil sample and closes to form a base plate by pushing the downward pressing vertical rod. The inner diameter of the annular drill bit is larger than the outer diameter of the inner sleeve soil sampler, but smaller than the inner diameter of the outer sleeve. The inner wall at the connection between the annular drill bit and the outer sleeve is provided with a chamfer corresponding to the cutting edge of the arc-shaped cutting blade, so as to guide the arc-shaped cutting blade to cut the soil sample obliquely downward after the arc-shaped cutting blade is subjected to the downward pressure of the downward pressing vertical rod.

[0007] Based on the above, the arc-shaped cutting blade is divided into two pieces, using a high-strength alloy cutting blade that is wider at the top and narrower at the bottom, with male and female teeth on the lower part.

[0008] Based on the above, the arc-shaped cutting blade is divided into three pieces, using a high-strength alloy cutting blade that is wider at the top and narrower at the bottom, with male and female teeth along the edge.

[0009] Based on the above, the pressing vertical rod is a rotating pressing vertical rod, and the arc-shaped cutting blade is connected to the rotating pressing vertical rod through a rotating pin.

[0010] Based on the above, it also includes an outer sleeve support ring fixed to the ground.

[0011] Based on the above, the outer sleeve is assembled from multiple outer cylinder sections by threaded connection, and the outer cylinder section is provided with a soil discharge hole.

[0012] Based on the above, the inner sleeve soil sampler is composed of multiple inner cylinder sections spliced ​​together by a pin mechanism.

[0013] This invention has outstanding substantive features and significant progress compared to the prior art, specifically: 1. This invention employs a rotating double-tube design with a rotating roller between the outer sleeve and the inner sleeve soil sampler, enabling the outer sleeve to rotate while the inner sleeve soil sampler remains stationary. This design is particularly suitable for shallow, undisturbed soil sampling and can effectively reduce interference with the undisturbed soil. 2. The rotating pressing vertical rod is connected to the arc-shaped cutting blade through a rotating pin. When the rotating pressing vertical rod is rotated, it drives the arc-shaped cutting blade to move downward, realizing the hyperbolic cutting movement of the arc-shaped cutting blade and completing the rapid cutting of the original soil at the bottom of the soil sampler.

[0014] 3. By setting an inclined chamfer on the inner wall of the annular drill bit, the curved cutting blade can be guided to cut the soil sample obliquely downward when subjected to downward pressure.

[0015] 4. By setting the male and female teeth of the arc-shaped cutting blade, the original soil after cutting is tightened when the male and female teeth cross and close, thereby completing the sampling of the original soil.

[0016] 5. By setting the outer sleeve support ring and anchor bolts, the drilling can be kept close to the ground to prevent tilting. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the arc-shaped cutting blade type double tube shallow undisturbed soil sampler of the present invention (the lower vertical rod is not pressed down).

[0018] Figure 2 This is a schematic diagram of the structure of the arc-shaped cutting blade type double tube shallow undisturbed soil sampler of the present invention (downward pressing of the vertical rod).

[0019] Figure 3 for Figure 2 Enlarged view of the elliptical portion.

[0020] In the diagram: 1. Outer sleeve; 2. Inner sleeve soil sampler; 3. Arc-shaped cutting blade; 4. Ring drill bit; 5. Rotary drilling disc; 6. Rotating roller; 7. Downward pressing vertical rod; 8. Outer sleeve support ring; 9. Rotating pin. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely below, but the present invention is not limited to these embodiments: Example 1 like Figures 1-3 As shown, a double-tube shallow undisturbed soil sampler with an arc-shaped cutting blade includes: an outer sleeve 1, an inner sleeve sampler 2, an arc-shaped cutting blade 3, and a ring-shaped drill bit 4. It also includes an outer sleeve support ring 8 fixed to the ground by anchor bolts.

[0022] The upper end of the outer sleeve 1 is equipped with a rotating drilling disk 5, and the lower end is equipped with an annular drill bit 4. The inner sleeve soil sampler 2 is disposed inside the outer sleeve 1 via a rotating roller 6, so that the inner sleeve soil sampler 2 remains stationary while the outer sleeve 1 is drilling to sample soil. Specifically, the rotating roller 6 includes an annular base and ball bearings embedded inside the annular base. The annular base is fixedly disposed to the bottom surface of the upper cover of the outer sleeve 1. The top surface of the upper cover of the inner sleeve soil sampler 2 is provided with a rolling groove, and the ball bearings are designed to roll within the rolling groove.

[0023] The arc-shaped cutting blade 3 is divided into two pieces, and is made of high-strength alloy cutting blade that is wider at the top and narrower at the bottom and has male and female teeth at the bottom.

[0024] A downward pressing vertical rod 7 is provided between the inner wall of the outer sleeve 1 and the outer wall of the inner sleeve soil sampler 2. One end of the downward pressing vertical rod 7 extends out of the outer sleeve 1, and the other end is used to hinge the arc-shaped cutting blade 3, so that when the outer sleeve 1 is drilling to sample soil, the arc-shaped cutting blade 3 is concealed between the inner wall of the outer sleeve 1 and the outer wall of the inner sleeve soil sampler 2. After the soil sampling is completed, the arc-shaped cutting blade 3 cuts the soil sample and closes to form a base by pushing the downward pressing vertical rod 7.

[0025] The inner diameter of the annular drill bit 4 is larger than the outer diameter of the inner sleeve soil sampler 2 and smaller than the inner diameter of the outer sleeve 1. The inner wall of the connection between the annular drill bit 4 and the outer sleeve 1 is provided with a chamfer 8 corresponding to the cutting edge of the arc-shaped cutting blade 3, so as to guide the arc-shaped cutting blade 3 to cut the soil sample obliquely downward after the arc-shaped cutting blade 3 is subjected to the downward pressure of the downward pressing vertical rod 7.

[0026] The working steps of the soil sampler in this embodiment are as follows: 1. Rotate the rotary drilling disk 5 to make the outer sleeve 1 drill into the soil; 2. Under the drilling thrust of the outer sleeve 1, the soil sampler reaches the designated soil depth; 3. Press down the pressing vertical rod 7, push the pressing vertical rod 7 downward, and drive the arc-shaped cutting blade 3 hidden between the inner wall of the outer sleeve 1 and the outer wall of the inner sleeve soil sampler 2 to move downward; 4. After being subjected to the downward pressure of the downward pressing vertical rod 7, the arc-shaped cutting blade 3 cuts the soil sample obliquely downward under the guidance of the inclined chamfer 8 and closes to form a base.

[0027] 5. While lifting the downward pressing vertical rod 7 upward, rotate the rotary drilling disk 5 in the opposite direction to remove the soil sampler and complete the original soil sample collection.

[0028] In this embodiment, during drilling and soil sampling, the outer sleeve 1 rotates while the inner sleeve soil sampler 2 remains stationary, greatly reducing interference with the original soil condition. The arc-shaped cutting blade 3 is hidden between the inner wall of the outer sleeve 1 and the outer wall of the inner sleeve soil sampler 2. Only after the soil sampler reaches the designated soil depth is the downward pressing vertical rod 7 pushed downward, causing the arc-shaped cutting blade 3 to complete the soil sample cutting and simultaneously sealing the lower opening of the soil sampler, thus sealing the original soil sample inside the inner sleeve soil sampler 2, thereby obtaining the original soil sample.

[0029] Example 2 The difference between this embodiment and embodiment 1 is that, in order to better seal the lower opening of the soil sampler, the arc-shaped cutting blade 3 is divided into three pieces, and a high-strength alloy cutting blade with a wider upper part and a narrower lower part and male and female teeth on the edge is used.

[0030] Example 3 The difference between this embodiment and embodiment 1 or embodiment 2 is that the pressing vertical rod 7 is a rotating pressing vertical rod, and the arc-shaped cutting blade 3 is connected to the rotating pressing vertical rod through a rotating pin 9.

[0031] Example 4 The difference between this embodiment and Embodiment 3 is that the outer sleeve 1 is composed of multiple outer cylinder sections connected by threads, and the outer cylinder 1 has a soil outlet hole. The inner sleeve soil sampler 2 is composed of multiple inner cylinder sections connected by a pin mechanism. By using a multi-section splicing method, soil samples of various lengths can be sampled.

Claims

1. A double-tube shallow undisturbed soil sampler with an arc-shaped cutting blade, characterized in that, include: Outer sleeve, inner sleeve soil sampler, arc-shaped cutting blade, and ring drill bit; The upper end of the outer sleeve is provided with a rotating drilling disk, and the lower end is provided with an annular drill bit; The inner sleeve soil sampler is installed inside the outer sleeve by a rotating roller, so that the inner sleeve soil sampler remains stationary when the outer sleeve is drilling and sampling soil. A downward pressing vertical rod is provided between the inner wall of the outer sleeve and the outer wall of the inner sleeve soil sampler. One end of the downward pressing vertical rod extends out of the outer sleeve, and the other end is used to hinge the arc-shaped cutting blade. This allows the arc-shaped cutting blade to be concealed between the inner wall of the outer sleeve and the outer wall of the inner sleeve soil sampler when the outer sleeve is drilling to extract soil. After soil extraction is completed, the arc-shaped cutting blade cuts the soil sample and closes to form a base plate by pushing the downward pressing vertical rod. The inner diameter of the annular drill bit is larger than the outer diameter of the inner sleeve soil sampler, but smaller than the inner diameter of the outer sleeve. The inner wall at the connection between the annular drill bit and the outer sleeve is provided with a chamfer corresponding to the cutting edge of the arc-shaped cutting blade, so as to guide the arc-shaped cutting blade to cut the soil sample obliquely downward after the arc-shaped cutting blade is subjected to the downward pressure of the downward pressing vertical rod.

2. The arc-shaped cutting blade type double-tube shallow undisturbed soil sampler according to claim 1, characterized in that: The arc-shaped cutting blade is divided into two pieces, and is made of high-strength alloy cutting blade that is wider at the top and narrower at the bottom, with male and female teeth on the lower part.

3. The arc-shaped cutting blade type double-tube shallow undisturbed soil sampler according to claim 1, characterized in that: The arc-shaped cutting blade is divided into three pieces, and is made of high-strength alloy cutting blade that is wider at the top and narrower at the bottom with male and female teeth on the edge.

4. The arc-shaped cutting blade type double-tube shallow undisturbed soil sampler according to any one of claims 1-3, characterized in that: The downward pressing rod is a rotating downward pressing rod, and the arc-shaped cutting blade is connected to the rotating downward pressing rod through a rotating pin.

5. The arc-shaped cutting blade type double-tube shallow undisturbed soil sampler according to claim 1, characterized in that: It also includes an outer sleeve support ring fixed to the ground.

6. The arc-shaped cutting blade type double-tube shallow undisturbed soil sampler according to claim 1, characterized in that: The outer sleeve is composed of multiple outer cylinder sections joined together by threaded connections, and the outer cylinder section has a soil discharge hole.

7. The arc-shaped cutting blade type double-tube shallow undisturbed soil sampler according to claim 1, characterized in that: The inner sleeve soil sampler is composed of multiple inner cylinder sections connected by a pin mechanism.

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