Undisturbed soil sampling device for shear strength detection
By designing a sampling device with an inner cylinder inside the drill barrel, using bearings and slag discharge troughs to reduce friction, and combining it with a jacking structure, the problem of incomplete undisturbed soil sampling in existing technologies has been solved, achieving soil sample integrity and testability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-13
- Publication Date
- 2026-03-24
AI Technical Summary
Existing soil samplers cannot maintain the integrity of the undisturbed soil during the rotary advance process, leading to sampling failure, especially in cohesive soils, making subsequent shear strength testing impossible.
A sampling device comprising a drill barrel and an inner cylinder was designed. The inner cylinder is installed inside the drill barrel and is coaxially rotatably connected to the drill barrel. Friction is reduced by bearings, and a slag discharge trough is set in the drill tooth section. Combined with a jacking structure, it is ensured that the soil sample enters the inner cylinder intact and avoids disintegration.
This improves the integrity of undisturbed soil sampling, ensuring that the soil sample is not damaged during the sampling process and can be used for subsequent shear strength testing.
Smart Images
Figure CN224034958U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of soil sampler, specifically relates to a undisturbed soil sampling device for shear strength detection. BACKGROUND
[0002] The undisturbed soil sampling technology is one of the core technologies in the fields of geotechnical engineering investigation, environmental geological survey and agricultural soil research, which obtains the undisturbed soil keeping the natural structure, water content and stress state to provide key data support for subsequent research.
[0003] In the prior art, the integrity of the columnar undisturbed soil sample directly determines the accuracy of the geotechnical test parameters, but the sampling drill cylinder usually penetrates the soil layer in a rotating manner, the soil sample enters the drill cylinder and rubs and vibrates with the inner wall of the drill cylinder, thereby causing the soil sample in the drill cylinder to directly disintegrate and crumble, and unable to form a complete columnar sample, for example, the cohesive soil with low water content often causes sampling failure, and thereby unable to perform subsequent shear strength test. UTILITARY MODEL
[0004] The utility model embodiment provides a undisturbed soil sampling device for shear strength detection, aims at solving the poor practicability problem of the existing soil sampler due to the failure in adapting to the complete sampling of the undisturbed soil.
[0005] To achieve the above object, the utility model adopts the technical scheme of providing a undisturbed soil sampling device for shear strength detection, comprising:
[0006] The drill cylinder has a cylinder cavity with one end being open, and the open end of the drill cylinder is provided with a drill tooth part;
[0007] The inner cylinder is arranged in the cylinder cavity and coaxially connected with the drill cylinder for rotation, and the inner cylinder has a sample storage cavity in communication with the open end of the drill cylinder.
[0008] In a possible implementation manner, the drill cylinder and the inner cylinder are provided with a bearing.
[0009] In a possible implementation manner, the bearing is provided with a plurality of bearings, and each bearing is arranged along the axial direction of the drill cylinder.
[0010] In a possible implementation manner, the outer diameter of the drill tooth part is greater than the outer diameter of the drill cylinder, and a plurality of slag discharge grooves are arranged around the drill tooth part.
[0011] In a possible implementation manner, the undisturbed soil sampling device for shear strength detection further comprises a pushing structure, and the pushing structure comprises:
[0012] A connecting pipe is fixedly connected to the other end of the drill cylinder, the connecting pipe has a pipe cavity communicating with the cylinder cavity, and a long-strip sliding port communicating with the pipe cavity is arranged on the connecting pipe;
[0013] A push rod is slidingly arranged in the pipe cavity and has one end extending into the cylinder cavity;
[0014] An end plate is arranged in the pipe cavity and connected to the other end of the push rod, the end plate has a pressing part capable of extending out of the long-strip sliding port;
[0015] A circular push plate is arranged in the cylinder cavity and connected to the push rod, the circular push plate is used to extend into the inner cylinder under the driving of the push rod to push the soil sample in the inner cylinder out.
[0016] In a possible implementation, the long-strip sliding port is provided with two long-strip sliding ports, and each long-strip sliding port is annularly and spacedly arranged around the axis of the connecting pipe;
[0017] Each pressing part corresponds to one long-strip sliding port.
[0018] In a possible implementation, the end part of the connecting pipe away from the drill cylinder is provided with a threaded connection part.
[0019] In a possible implementation, the other end of the inner cylinder is provided with a through hole for the circular push plate to pass through;
[0020] The diameter of the through hole is greater than the diameter of the circular push plate.
[0021] In a possible implementation, the outer circumferential surface of the circular push plate is provided with a sealing ring.
[0022] In a possible implementation, the inner wall surface of the through hole is a conical surface.
[0023] In the present implementation, the inner cylinder is rotatably arranged in the drill cylinder, so that the columnar soil sample can enter into the inner cylinder during the rotation of the drill cylinder and the penetration of the soil layer, the inner cylinder can remain stationary with the columnar soil, thereby reducing the friction on the outer wall of the columnar soil sample, effectively avoiding the disintegration and fragmentation of the columnar soil sample entering into the drill cylinder, improving the probability of the integrity of the undisturbed soil sampling, and further ensuring the sampling effect. BRIEF DESCRIPTION OF DRAWINGS
[0024] Figure 1 A structure schematic view of the undisturbed soil sampling device for shear strength detection provided by the present application is shown;
[0025] Figure 2 A sectional structure schematic view of the undisturbed soil sampling device for shear strength detection provided by the present application is shown.
[0026] Figure 3 For Figure 2 The embodiment provides the enlarged structure schematic view of the undisturbed soil sampling device for shear strength detection.
[0027] Explanation of reference signs:
[0028] 10, drill cylinder; 11, cylinder cavity; 12, drill tooth part; 13, slag discharge groove;
[0029] 20, inner cylinder; 21, sample storage cavity; 22, conical surface;
[0030] 30, bearing;
[0031] 40, pushing structure; 41, connecting pipe; 411, long strip sliding port; 412, threaded connection part; 42, push rod; 43, end plate; 431, pressing part; 44, circular push plate; 45, sealing ring;
[0032] 50, annular cutter. DETAILED DESCRIPTION
[0033] In order to make the technical problems, technical schemes and beneficial effects to be solved by the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and not to limit the utility model.
[0034] Please refer to Figure 1 and Figure 2 The undisturbed soil sampling device for shear strength detection provided by the utility model will be described. The undisturbed soil sampling device for shear strength detection comprises a drill cylinder 10 and an inner cylinder 20. The drill cylinder 10 has a cylinder cavity 11 with an open end, and the drill cylinder 10 is provided with a drill tooth part 12 at the open end. The inner cylinder 20 is arranged in the cylinder cavity 11 and is coaxially connected with the drill cylinder 10 to rotate, and the inner cylinder 20 has a sample storage cavity 21 which is in communication with the open end of the drill cylinder 10.
[0035] In use, the drill cylinder 10 can be connected with a drilling machine, and is rotated under the driving of the drilling machine, thereby realizing penetration of the soil layer.
[0036] Compared with the prior art, the inner cylinder 20 is arranged to rotate in the drill cylinder 10, so that the cylindrical soil sample can enter the inner cylinder 20 during the rotation and penetration of the drill cylinder 10, the inner cylinder 20 can remain stationary with the cylindrical soil sample, thereby reducing the friction on the outer wall of the cylindrical soil sample, effectively avoiding disintegration and fragmentation of the cylindrical soil sample entering the interior of the drill cylinder 10, improving the probability of the integrity of the undisturbed soil sampling, and thereby ensuring the sampling effect.
[0037] It needs to be explained that during the rotation of the drill cylinder 10, only the drill tooth part 12 causes friction to the columnar soil sample, but the friction surface is small, and there is relative movement between the soil sample and the drill tooth part 12, which has little effect on the completion of the sampling of the columnar soil sample.
[0038] It also needs to be explained that the drill tooth part 12 can be integrally formed with the drill cylinder 10, and the cylinder cavity 11 is also formed by the drill tooth part 12 and the drill cylinder 10 together, and the open end is located on the drill tooth part 12.
[0039] In some embodiments, the above-mentioned drill cylinder 10 and the inner cylinder 20 can adopt the structure as shown in Figure 2 . Referring to Figure 2 , a bearing 30 is arranged between the drill cylinder 10 and the inner cylinder 20, which can ensure that the friction between the inner cylinder 20 and the drill cylinder 10 is reduced, thereby ensuring that the inner cylinder 20 can be arranged stationary with the columnar soil sample.
[0040] In some embodiments, the above-mentioned drill cylinder 10 and the inner cylinder 20 can adopt the structure as shown in Figure 2 . Referring to Figure 2 , a plurality of bearings 30 are arranged, and each bearing 30 is arranged along the axial direction of the drill cylinder 10.
[0041] The arrangement of the plurality of bearings 30 can ensure the stable connection between the inner cylinder 20 and the rotating cylinder, and also ensure the stability of the rotation of the inner cylinder 20.
[0042] It needs to be explained that the inner cylinder 20 can be a thrust bearing 30.
[0043] In some embodiments, the above-mentioned drill tooth part 12 can adopt the structure as shown in Figure 2 . Referring to Figure 2 , the outer diameter of the drill tooth part 12 is greater than the outer diameter of the drill cylinder 10, and a plurality of slag discharge grooves 13 are arranged around the drill tooth part 12.
[0044] The outer diameter of the drill cylinder 10 is smaller than the outer diameter of the drill tooth part 12, that is, after the rotation of the drill cylinder 10 and the drilling through the drill tooth part 12, the diameter of the hole opened on the soil layer will be greater than the diameter of the drill cylinder 10, eliminating the friction between the drill cylinder 10 and the drill hole. At the same time, a plurality of slag discharge grooves 13 are arranged on the outer wall of the drill tooth part 12, which can ensure that the broken soil generated at the drill tooth part 12 can enter between the drill hole and the drill cylinder 10 through each slag discharge groove 13, and then be discharged from the drill hole, avoiding the squeezing of the broken soil below the drill tooth part 12, thereby avoiding affecting the sampling effect.
[0045] As another embodiment of the undisturbed soil sampling device for shear strength detection provided by the present application, referring to Figure 2 and Figure 3The undisturbed soil sampling device for shear strength detection further comprises a pushing structure 40, which comprises a connecting pipe 41, a pushing rod 42, an end plate 43 and a circular pushing plate 44. The connecting pipe 41 is fixedly connected to the other end of the drill cylinder 10, has a pipe cavity in communication with the cylinder cavity 11, and is provided with a long strip sliding port 411 in communication with the pipe cavity. The pushing rod 42 is slidingly arranged in the pipe cavity and has one end extending into the cylinder cavity 11. The end plate 43 is arranged in the pipe cavity and connected to the other end of the pushing rod 42, and has a pressing portion 431 capable of extending out of the long strip sliding port 411. The circular pushing plate 44 is arranged in the cylinder cavity 11 and connected to the pushing rod 42, and can be driven by the pushing rod 42 to extend into the inner cylinder 20 to push the soil sample in the inner cylinder 20 out.
[0046] In the embodiment, the drill cylinder 10 can be connected to the drilling machine through the connecting pipe 41.
[0047] After the sampling is completed, the undisturbed soil is fragile, and direct knocking may cause the columnar soil sample to be broken.
[0048] After the drill cylinder 10 is taken out of the drill hole, the pushing rod 42 can be pushed by the pressing portion 431 on the end plate 43, so that the circular pushing plate 44 abuts against the columnar soil sample, and then the pressure on the pressing portion 431 is increased to push the columnar soil sample in the inner cylinder 20 out of the opening of the inner cylinder 20 and the drill cylinder 10. Through the pushing structure 40, pressure can be effectively applied in the axial direction of the columnar soil sample after the sampling is completed, thereby ensuring the integrity of the soil sample.
[0049] The long strip sliding port 411 needs to be arranged along the axial direction of the connecting pipe 41.
[0050] In some embodiments, the long strip sliding port 411 can adopt the structure as shown in Figure 2 . Referring to Figure 2 , the long strip sliding port 411 is provided with two long strip sliding ports 411, each of which is annularly and spacedly arranged around the axis of the connecting pipe 41.
[0051] Specifically, the pressing portion 431 is provided with two pressing portions 431, each of which corresponds to each long strip sliding port 411.
[0052] The two pressing portions 431 correspond to the two long strip sliding ports 411, respectively, which can ensure that pressure is applied through the two pressing portions 431 at the same time, thereby ensuring that the pushing rod 42 is uniformly stressed, and thereby ensuring the effect of pushing the columnar soil sample.
[0053] In some embodiments, the connecting pipe 41 can adopt the structure as shown in Figure 2 . Referring to Figure 2The end of the connecting pipe 41 away from the drill cylinder 10 is provided with a threaded connection part 412, which can be detachably connected with a drill rod of a drilling machine.
[0054] In some embodiments, the inner cylinder 20 can adopt the structure as shown in Figure 3 Figure 3 The other end of the inner cylinder 20 is provided with a through hole through which the circular push plate 44 passes.
[0055] Specifically, the hole diameter of the through hole is greater than the diameter of the circular push plate 44.
[0056] The provision of the through hole can ensure the passing of the push plate, and the hole diameter of the through hole being greater than the diameter of the circular push plate 44 can eliminate the friction of the circular push plate 44 on the inner cylinder 20, avoid the rotation of the inner cylinder 20, and further avoid the friction of the inner cylinder 20 on the soil sample, thereby ensuring the sampling effect.
[0057] In some embodiments, the circular push plate 44 can adopt the structure as shown in Figure 3 Figure 3 The outer peripheral surface of the circular push plate 44 is provided with a sealing ring 45.
[0058] The provision of the sealing ring 45 can ensure the sealing of the gap between the circular push plate 44 and the through hole, avoid the entry of the broken soil into the back of the circular push plate 44, and the elasticity of the sealing ring 45 can also avoid the generation of large friction between the circular push plate 44 and the inner cylinder 20.
[0059] In some embodiments, the through hole can adopt the structure as shown in Figure 3 Figure 3 The inner wall surface of the through hole is a conical surface 22, and the small-diameter end of the conical surface 22 is close to the open end of the drill cylinder 10. This structure can ensure that the circular push plate 44 is just inside the conical surface 22 when it moves upward to the limit position, further reduce the friction between the sealing ring 45 and the inner cylinder 20, and further ensure the stability of the inner cylinder 20.
[0060] In some embodiments, the drill cylinder 10 can adopt the structure as shown in Figure 2 Figure 2 The bottom end of the drill tooth part 12 is provided with an annular cutter 50, and the inner diameter of the annular cutter 50 is equal to the inner diameter of the opening of the drill cylinder 10. The annular cutter 50 can avoid the extrusion of the inner soil sample by the rotation of the drill tooth part 12, and further ensure the sampling effect of the columnar soil sample.
[0061] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. An undisturbed soil sampling device for shear strength testing, characterized by, The utility model relates to a soil sampling device for shear strength detection, comprising: a drill cylinder having a cylinder cavity with an open end, wherein the open end of the drill cylinder is provided with a drill bit part; an inner cylinder arranged in the cylinder cavity and coaxially connected with the drill cylinder, wherein the inner cylinder has a sample storage cavity communicating with the open end of the drill cylinder.
2. The undisturbed soil sampling device for shear strength testing of claim 1, wherein, A plurality of bearings are arranged between the drill cylinder and the inner cylinder.
3. The undisturbed soil sampling device for shear strength testing of claim 2, wherein, The bearings are arranged along the axial direction of the drill cylinder.
4. The undisturbed soil sampling device for shear strength testing of claim 1, wherein, The outer diameter of the drill bit part is greater than the outer diameter of the drill cylinder, and a plurality of slag discharge grooves are arranged around the drill bit part.
5. The undisturbed soil sampling device for shear strength testing of claim 1, wherein, The soil sampling device for shear strength detection further comprises a pushing structure, wherein the pushing structure comprises: a connecting pipe fixedly connected with the other end of the drill cylinder, wherein the connecting pipe has a pipe cavity communicating with the cylinder cavity, and a long strip sliding opening communicating with the pipe cavity is arranged on the connecting pipe; a push rod slidingly arranged in the pipe cavity and having one end extending into the cylinder cavity; an end plate arranged in the pipe cavity and connected with the other end of the push rod, wherein the end plate has a pressing part capable of extending out of the long strip sliding opening; a circular push plate arranged in the cylinder cavity and connected with the push rod, wherein the circular push plate is used to extend into the inner cylinder under the driving of the push rod to push the soil sample in the inner cylinder out.
6. The undisturbed soil sampling device for shear strength testing of claim 5, wherein, The long strip sliding opening is arranged in a ring shape around the axis of the connecting pipe. The pressing part is one-to-one corresponding to the long strip sliding opening.
7. The undisturbed soil sampling device for shear strength testing of claim 5, wherein, The end of the connecting pipe away from the drill cylinder is provided with a threaded connection part.
8. The undisturbed soil sampling device for shear strength testing of claim 5, wherein, The other end of the inner cylinder is provided with a through hole for the circular push plate to pass through. The diameter of the through hole is greater than the diameter of the circular push plate.
9. The undisturbed soil sampling apparatus for shear strength detection of claim 8, wherein, The outer circumferential surface of the circular push plate is provided with a sealing ring.
10. The undisturbed soil sampling apparatus for shear strength testing of claim 9, wherein, The inner wall surface of the through hole is a conical surface.