Undisturbed soil sampling device for soil test

Abstract

A soil test undisturbed soil sampling device relates to the field of soil test sampling equipment and comprises a cutting ring and a pressing mechanism, the pressing mechanism comprises an auxiliary block capable of pushing the cutting ring to vertically move, and a cushion block used for placing an undisturbed soil sample to be cut is further arranged on the lower side of the auxiliary block; a raised head is arranged at the lower end of the auxiliary block, a connecting ring is inserted into the outer ring of the auxiliary block, and an annular groove matched with the outer ring of the upper end of the cutting ring in an inserted mode is formed in the inner ring of the lower end of the connecting ring; a gap larger than zero exists between the bottom face of the protruding head and the cutting ring, and the minimum inner diameter of the connecting ring is not smaller than the inner diameter of the cutting ring. The cutting ring is matched and connected with the raised head through the connecting ring, so that the cutting ring can stably cut into an undisturbed soil sample without generating position change, and the sampling precision is improved; meanwhile, the gap between the raised head and the cutting ring and the minimum inner diameter of the connecting ring are not smaller than the inner diameter of the cutting ring, so that the undisturbed soil sample is prevented from being subjected to extra resistance when the cutting ring cuts into the undisturbed soil sample, disturbance is avoided, and the test accuracy is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of soil test sampling equipment, in particular to the soil test undisturbed soil sampling device. BACKGROUND

[0002] The soil test undisturbed soil ring knife is a necessary step for density measurement and mechanical test, and the ring knife is pressed into the undisturbed soil sample manually in the original undisturbed soil sampling, but manual operation is simple and effective for soft soil and general shallow soil sampling, and it is difficult to press the ring knife into the undisturbed soil sample stably by manual pressure when hard soil is encountered, and the undisturbed soil sample is disturbed easily in the process, therefore, some devices using labor-saving levers to push the ring knife are developed, but defects still exist in the device during use.

[0003] For example, the soil test ring knife sampler with the application number CN202222634251.8, the sampler includes a pad and a pressure rod on the upper side of the pad, the lower side of the pressure rod is connected with an auxiliary block, wherein the pressure rod is a labor-saving lever, the undisturbed soil sample is placed on the pad during use, the ring knife is placed on the upper side of the undisturbed soil sample at the sampling position, then the pressure rod is pressed manually, the lower side of the auxiliary block contacts the upper side of the ring knife, and the pressure is continuously applied, and the ring knife is quickly cut into the undisturbed soil sample by the auxiliary block.

[0004] The lower side of the auxiliary block is a plane to facilitate the accurate contact between the lower side of the auxiliary block and the upper side of the ring knife, which improves the accuracy during contact, but the position of the ring knife is easily deviated at the moment of pressing the pressure rod, thereby affecting the sampling accuracy, in addition, the ring knife may not be completely cut into the undisturbed soil sample when the undisturbed soil sample is thick, the undisturbed soil sample on the upper side of the ring knife contacts the auxiliary block, and the undisturbed soil sample is disturbed during the continuous pressing process, thereby affecting the test accuracy. UTILITY MODEL CONTENTS

[0005] To solve the technical problems of the existing soil test ring knife sampler in the background art, the position of the ring knife is easily deviated to affect the sampling accuracy and the undisturbed soil sample is easily disturbed to affect the test accuracy, the utility model provides a soil test undisturbed soil sampling device.

[0006] The technical scheme of the utility model is as follows:

[0007] The soil test undisturbed soil sampling device comprises a cutting ring and a pressing mechanism, the pressing mechanism comprises an auxiliary block capable of pushing the cutting ring to move vertically, and the lower side of the auxiliary block is further provided with a cushion block for placing the undisturbed soil sample to be cut, the cutting ring is a standard part and can be selected according to actual needs, the specific structure and working principle of the auxiliary block and the cushion block have been described in the patent with the application number CN202222634251.8, and the pressing mechanism can be the structure in the patent with the application number CN202222634251.8 for driving the auxiliary block to move vertically to cut the undisturbed soil sample placed on the cushion block, which replaces manual work and ensures that the cutting ring can smoothly cut into the undisturbed soil sample, and the working principle will not be described here.

[0008] As the core technical concept of the utility model, the lower end of the auxiliary block of the sampling device is provided with a protruding head, the outer circle of the protruding head is connected with a connecting ring, and the inner circle of the lower end of the connecting ring is provided with an annular groove matched with the outer circle of the upper end of the cutting ring. The design of the connecting structure enables the cutting ring to stably cut into the undisturbed soil sample without position change, thereby improving the sampling accuracy. Meanwhile, the gap between the bottom surface of the protruding head and the cutting ring is greater than zero, and the minimum inner diameter of the connecting ring is not less than the inner diameter of the cutting ring. The design ensures that the cutting ring has a sufficient gap for accommodating the undisturbed soil sample when cutting into the undisturbed soil sample, so that the undisturbed soil sample will not be subjected to additional resistance, avoiding disturbance, thereby improving the accuracy of the test.

[0009] Further, the groove bottom surface of the annular groove and the lower side surface of the auxiliary block are both flat surfaces, the upper side surface of the connecting ring is fitted with the lower side surface of the auxiliary block, and the upper side surface of the cutting ring is fitted with the groove bottom surface of the annular groove. The close fit between the connecting ring and the auxiliary block and between the cutting ring and the annular groove of the connecting ring can reduce the gap and shaking, thereby reducing the disturbance and deformation of the soil, and further obtaining a more real and accurate undisturbed soil sample, which helps to improve the reliability of the soil test results.

[0010] Further, the connecting ring and the protruding head are in interference fit, and the cutting ring and the annular groove are in interference fit. While ensuring close fit, the connecting ring and the protruding head can be relatively easily disassembled and installed, which is convenient for use.

[0011] As a preferred implementation, the minimum inner diameter of the connecting ring is greater than the inner diameter of the cutting ring, so as to further ensure that the cutting ring will not be subjected to additional resistance when cutting into the undisturbed soil sample, thereby avoiding disturbance to the undisturbed soil sample and further helping to improve the accuracy of the test.

[0012] The soil test undisturbed soil sampling device as described above, the upper side surface of the cushion block is provided with a positioning mark for positioning the position of the undisturbed soil sample to be cut, and the mark includes but is not limited to a circular positioning mark or a cross-shaped positioning mark, and here the cross-shaped positioning mark is preferred.

[0013] Preferably, the gap between the bottom surface of the convex head and the ring cutter is not less than 1 cm, and by reserving at least 1 cm space between the bottom surface of the convex head and the top surface of the ring cutter, it is ensured that the undisturbed soil sample can be stretched out of the ring cutter and the undisturbed soil sample will not be extruded and disturbed during the process of cutting the ring cutter into the undisturbed soil sample, that is, the accuracy of sampling and testing after sampling is improved.

[0014] Of course, it can be understood here that the gap between the convex head and the ring cutter is not less than 1 cm, that is, the difference between the actual thickness of the undisturbed soil sample to be cut and the actual length of the ring cutter is not more than 1 cm, so as to meet the requirement that the distance from the lower end of the ring cutter to the lower end of the convex head is not less than the thickness of the undisturbed soil sample to be cut, thereby preventing the undisturbed soil sample from being disturbed and improving the accuracy of the test.

[0015] In order to improve the reliability of the connection between the connecting ring and the ring cutter, the thickness of the side wall of the annular groove of the connecting ring is not less than 0.5 mm.

[0016] In order to improve the stability and simplify the manufacturing process, the auxiliary block and the convex head are integrally manufactured.

[0017] The undisturbed soil sampling device for soil test as described above, the material of the convex head and the connecting ring includes but is not limited to stainless steel material, cast iron material and transparent plastic material, wherein the stainless steel and the cast iron have the characteristics of high strength and wear resistance, and have long service life, and the transparent plastic material can facilitate observation of the sampling process, is convenient to use, and the above-mentioned materials can be selected according to actual needs.

[0018] As a preferred implementation manner, the pressing mechanism can also be other structures capable of pushing the ring cutter to cut into the undisturbed soil sample and saving labor force, such as a manual press or an electric press or a shear jack, and here, the manual press is preferred to facilitate manual control by the operator.

[0019] The undisturbed soil sampling device for soil test as described above, the material of the convex head and the connecting ring includes but is not limited to stainless steel material, cast iron material and transparent plastic material, wherein the stainless steel and the cast iron have the characteristics of high strength and wear resistance, and have long service life, and the transparent plastic material can facilitate observation of the sampling process, is convenient to use, and the above-mentioned materials can be selected according to actual needs. BRIEF DESCRIPTION OF DRAWINGS

[0020] In the drawings:

[0021] Figure 1 Fig. 1 is a structural schematic view of the undisturbed soil sampling device for soil test of the present application;

[0022] Figure 2 For Figure 1 The enlarged schematic view at A in the figure;

[0023] Figure 3 The top view of the cushion block in the embodiment;

[0024] The components represented by the reference numerals in the figures are:

[0025] 1. cushion block; 11. cross-shaped positioning mark; 2. hand-operated press; 21. auxiliary block; 22. protruding head; 3. connecting ring; 31. annular groove; 4. ring cutter. DETAILED DESCRIPTION

[0026] In combination Figure 1 , the soil test undisturbed soil sampling device provided in the embodiment includes a ring cutter 4 and a pressing mechanism, the pressing mechanism includes an auxiliary block 21 capable of pushing the ring cutter 4 to move vertically, and the lower side of the auxiliary block 21 is further provided with a cushion block 1 for placing an undisturbed soil sample to be cut, the ring cutter 4 is a standard part and can be selected according to actual needs, the specific structure and working principle of the auxiliary block 21 and the cushion block 1 have been described in the patent with the application number CN202222634251.8, and the pressing mechanism can be the structure in the patent with the application number CN202222634251.8 for driving the auxiliary block 21 to move vertically to cut the undisturbed soil sample placed on the cushion block 1, which replaces manual work and ensures that the ring cutter 4 can smoothly cut into the undisturbed soil sample, and the working principle will not be described here.

[0027] As the core technical concept of the utility model, the lower end of the auxiliary block 21 of the sampling device is provided with a protruding head 22, the outer circle of which is connected with a connecting ring 3, and the inner circle of the lower end of the connecting ring 3 is provided with an annular groove 31 matched with the outer circle of the upper end of the ring cutter 4, the design of the above connecting structure enables the ring cutter 4 to stably cut into the undisturbed soil sample without position change, thereby improving the sampling accuracy; at the same time, the gap between the bottom surface of the protruding head 22 and the top surface of the ring cutter 4 is greater than zero, and the minimum inner diameter of the connecting ring 3 is not less than the inner diameter of the ring cutter 4, the above design ensures that there is a gap between the protruding head 22 and the ring cutter 4 for accommodating the undisturbed soil sample to extend in when the ring cutter 4 cuts into the undisturbed soil sample, so that the undisturbed soil sample will not be subjected to additional resistance, avoiding disturbance and thereby improving the accuracy of the test.

[0028] According to needs, in a preferred embodiment, the pressing mechanism can also be other structures capable of pushing the ring cutter 4 to cut into the undisturbed soil sample to save labor and effort, for example, a hand-operated press 2 or an electric press or a shear jack, in the embodiment, the hand-operated press 2 is preferred for the convenience of manual control by the operator.

[0029] Specifically, as Figure 1As shown, the upper end of the auxiliary block 21 is threadedly connected with the lower end of the lower pressing head of the manual pressing machine 2 for easy disassembly, the lower side of the auxiliary block 21 and the groove bottom of the annular groove 31 of the connecting ring 3 are both flat, and the upper side of the connecting ring 3 is fitted with the lower side of the auxiliary block 21, and the upper side of the annular cutter 4 is fitted with the groove bottom of the annular groove 31. The above design can reduce the gap and shaking through the close fit between the connecting ring 3 and the auxiliary block 21 and the annular groove 31 of the connecting ring 3 and the annular cutter 4, thereby reducing the disturbance and deformation of the soil, and further obtaining a more real and accurate undisturbed soil sample, which helps to improve the reliability of the soil test results.

[0030] In combination Figure 2 In order to improve the reliability of the connection between the connecting ring 3 and the annular cutter 4, the thickness of the side wall where the annular groove 31 of the connecting ring 3 is located is not less than 0.5 mm, and the minimum inner diameter of the connecting ring 3 is greater than the inner diameter of the annular cutter 4, so as to further ensure that the annular cutter 4 will not be subjected to additional resistance when cutting into the undisturbed soil sample, thereby avoiding disturbance to the undisturbed soil sample, and further helping to improve the accuracy of the test.

[0031] According to the needs, in a preferred embodiment, the gap between the bottom of the convex head 22 and the annular cutter 4 is not less than 1 cm, and by reserving at least 1 cm space between the bottom of the convex head 22 and the top of the annular cutter 4, it is ensured that during the process of cutting the annular cutter 4 into the undisturbed soil sample, the undisturbed soil sample can be stretched out of the annular cutter 4, and the undisturbed soil sample can not be disturbed by extrusion, that is, the accuracy of sampling and testing after sampling is improved.

[0032] Of course, it can be understood here that the above-mentioned gap of not less than 1 cm between the bottom of the convex head 22 and the top of the annular cutter 4 is designed according to the actual commonly used specifications of the annular cutter 4, that is, the difference between the thickness of the undisturbed soil sample to be cut and the actual length of the annular cutter 4 used is usually not more than 1 cm. The above design can ensure that the distance from the lower end of the annular cutter 4 to the lower end of the convex head 22 is not less than the thickness of the undisturbed soil sample to be cut, thereby preventing disturbance to the undisturbed soil sample and improving the accuracy of the test.

[0033] Based on the above design, the inner circle of the upper end of the connecting ring 3 and the outer circle of the convex head 22 and the outer circle of the annular cutter 4 and the annular groove 31 are all interference fit, which can ensure close fit while being relatively easy to disassemble and install, thereby facilitating use.

[0034] It can be understood that in order to further prevent disturbance to the undisturbed soil sample, the connecting ring 3 and the annular cutter 4 can be taken off the pressing block together when disassembling the annular cutter 4, thereby preventing disturbance to the undisturbed soil sample when directly disassembling the annular cutter 4 from the connecting ring 3 due to the small exposed area of the annular cutter 4 and the limited operation space for disassembly.

[0035] In combination Figure 3, the center of the upper side of the cushion block 1 is provided with a positioning mark for positioning the position of the to-be-cut undisturbed soil sample, and the positioning mark includes but is not limited to a circular positioning mark or a cross-shaped positioning mark 11, and the cross-shaped positioning mark 11 is preferred herein.

[0036] To improve stability and simplify the manufacturing process, the auxiliary block 21 and the lug 22 are integrally manufactured, and the materials of the lug 22 and the connecting ring 3 include but are not limited to stainless steel, cast iron, and transparent plastic, wherein stainless steel and cast iron have the characteristics of high strength and wear resistance, and have a long service life, and the transparent plastic material can facilitate observation of the sampling process and facilitate use. The above-mentioned materials can be selected according to actual needs, and are not specifically limited in the embodiment.

[0037] In a preferred embodiment, the specific operation steps are as follows:

[0038] 1. Select a 2cm long cutting ring 4, a 3cm long connecting ring 3 (the depth of the annular groove 31 is 0.5cm), and a 3cm thick sheet-shaped undisturbed soil sample; select the lug 22 and the connecting ring 3 to be transparent plastic materials;

[0039] 2. Connect the cutting ring 4 and the connecting ring 3 to the lug 22 in sequence (the gap between the lug 22 and the cutting ring 4 is 1.5cm);

[0040] 3. Place the undisturbed soil sample on the cushion block 1 and align it with the cross-shaped positioning mark 11 on the cushion block 1;

[0041] 4. Pull down the auxiliary block 21 installed on the hand press 2, and then easily and accurately cut the cutting ring 4 into the undisturbed soil sample until the soil sample extends from the upper end of the cutting ring 4;

[0042] 5. After disconnecting the connecting ring 3 from the lug 22, disconnect the cutting ring 4 from the lug 22, and finally trim and smooth the excess soil at both ends of the cutting ring 4.

Claims

1. A device for sampling undisturbed soil in geotechnical test, comprising a cutting ring (4) and a pressing mechanism, the pressing mechanism comprising an auxiliary block (21) capable of pushing the cutting ring (4) to move vertically, and the lower side of the auxiliary block (21) is further provided with a cushion block (1) for placing the undisturbed soil sample to be cut, characterized in that: the lower end of the auxiliary block (21) is provided with a protrusion (22), the outer ring of which is connected with a connecting ring (3) through plug-in connection, and the lower end of the connecting ring (3) is provided with an annular groove (31) in the inner ring, which is plug-in matched with the outer ring of the upper end of the cutting ring (4); the gap between the bottom surface of the protrusion (22) and the cutting ring (4) is greater than zero, and the minimum inner diameter of the connecting ring (3) is not less than the inner diameter of the cutting ring (4). The bottom surface of the annular groove (31) and the lower side of the auxiliary block (21) are both flat surfaces. The upper side of the connecting ring (3) is in close contact with the lower side of the auxiliary block (21), and the upper side of the cutting ring (4) is in close contact with the bottom surface of the annular groove (31).

2. The undisturbed soil sampling device of claim 1, wherein, The minimum inner diameter of the connecting ring (3) is greater than the inner diameter of the cutting ring (4). The connecting ring (3) and the protrusion (22) are in interference fit, and the cutting ring (4) and the annular groove (31) are also in interference fit.

3. The undisturbed soil sampling device of claim 1, wherein, The upper side of the cushion block (1) is provided with a circular positioning mark / cross-shaped positioning mark (11) for positioning the position of the undisturbed soil sample to be cut.

4. The undisturbed soil sampling device of claim 1, wherein, The gap between the bottom surface of the protrusion (22) and the cutting ring (4) is not less than 1 cm.

5. The intact soil sampling device of claim 1, wherein, The thickness of the side wall of the annular groove (31) of the connecting ring (3) is not less than 0.5 mm.

6. The undisturbed soil sampling device of any one of claims 1-5, wherein, The auxiliary block (21) and the protrusion (22) are integrally formed.

7. The undisturbed soil sampling device of claim 6, wherein, The protrusion (22) and the connecting ring (3) are made of stainless steel / cast iron / transparent plastic.

8. The intact soil sampling device of claim 6, wherein, The pressing mechanism is a hand press (2) / electric press / shear jack.

9. The intact soil sampling device of claim 8, wherein, ​ 10. The intact soil sampling device of claim 6, wherein, ​

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