Rotary hydrostatic full core sampler and method of use

Abstract

The application discloses a rotary static pressure type full-core soil sampler and a use method, and relates to the field of soil sampling devices.The rotary static pressure type full-core soil sampler comprises a static pressure soil sampling pipe, the inside of the static pressure soil sampling pipe is provided with a soil sample cylinder, a combined double-pipe drill, a drainage unit and a pressure transmission unit.The combined double-pipe drill comprises a fixedly connected outer pipe and an inner pipe, the bottom of the outer pipe is connected with a drill bit, the static pressure soil sampling pipe is installed in the inner pipe, and the pressure transmission unit is arranged between the static pressure soil sampling pipe and the inner pipe.The pressure transmission unit can convert the rotary down pressure of the inner pipe into the linear advancing force of the static pressure soil sampling pipe.The drainage unit is arranged between the top of the outer pipe and the inner pipe, and the drainage unit can discharge the mud water generated in the drilling process.The outer pipe and the inner pipe and the drill bit and the static pressure soil sampling pipe are provided with a mutual communication gap.The rotary static pressure type full-core soil sampler improves the soil sampling efficiency and quality, has the advantages of wide application range, simple structure, convenient construction operation and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of soil samplers, in particular to a rotary static pressure full-core sampler and a use method thereof. BACKGROUND

[0002] In engineering geological exploration and survey work, in order to obtain the physical and mechanical performance indicators of the foundation soil, in addition to in-situ testing, the main means is still to take samples by drilling and then conduct indoor soil test. To obtain undisturbed soil samples close to the natural structure, the key lies in improving the sampling technology and using advanced soil samplers.

[0003] In China, a thick-walled sampler has been widely used for decades, and a thin-walled sampler is usually used for soft soil sampling. Two drillings are needed to obtain a soil sample by using these two samplers. The first drilling is to drill down, and the second drilling is to place the sampler to the bottom of the drilled hole, and then the sampler is pressed or hammered into the soil layer to take the soil sample. Most of the time is spent on the lifting and placing of the drill rod and the loading and unloading operation, and the soil sampling efficiency needs to be improved, especially with the development trend of deep exploration, this problem is more prominent.

[0004] Foreign double-pipe single-action samplers and triple-pipe single-action samplers separate the outer pipe and the inner pipe in the sampler by a set of bearings, so that the outer pipe rotates while the inner pipe is pressed downward to take the soil sample, realizing "two drills in one". However, the double-pipe single-action sampler does not have a soil sample cylinder in the inner pipe, and the sample is taken out by water flushing, which causes great disturbance. The triple-pipe single-action sampler adds a seamless pipe soil sample cylinder in the inner pipe, which still needs to be matched with a soil pushing device to push out the soil sample. These two samplers are mainly suitable for hard soil sampling, and there are problems such as complex multi-bearing combination structure, heavy and cumbersome operation, long and winding drainage channel, and inconvenient cleaning and maintenance, and they are rarely used in China.

[0005] Therefore, it is urgent to provide a sampler that realizes two drills in one, has small soil disturbance, is suitable for soft and hard soil, and has a simple structure, to improve the soil sampling efficiency and the quality of the soil sample. SUMMARY

[0006] Therefore, it is necessary to provide a rotary static pressure full-core sampler and a use method thereof to solve the above technical problems.

[0007] A rotary static pressure full-core sampler, comprising:

[0008] a static pressure soil sampling pipe, the inside of the static pressure soil sampling pipe being provided with a soil sample cylinder;

[0009] The combined double-tube drill comprises a fixedly connected outer tube and inner tube, the bottom of the outer tube is connected with a drill bit, a static pressure soil sampling tube is installed in the inner tube, and a pressure transmission unit is arranged between the static pressure soil sampling tube and the inner tube, which can convert the rotary down pressure of the inner tube into a linear advancing force of the static pressure soil sampling tube;

[0010] A drainage unit is arranged between the top of the outer tube and the inner tube, which can drain the mud water generated during drilling;

[0011] The outer tube and the inner tube, the drill bit and the static pressure soil sampling tube have a mutual communication gap.

[0012] In one embodiment, the pressure transmission unit comprises:

[0013] An axial pressing device is fixed to the lower end of the inner tube;

[0014] An axial bearing device is fixed to the outer sidewall of the static pressure soil sampling tube, and the axial bearing device is in sliding contact with the axial pressing device when the drill bit rotates and drills.

[0015] In one embodiment, a reduced diameter unit is arranged between the inner side of the drill bit and the outer side of the static pressure soil sampling tube, which can limit the position of the static pressure soil sampling tube in the drill bit, so that the static pressure soil sampling tube cannot fall off.

[0016] In one embodiment, the reduced diameter unit comprises:

[0017] An inner step is arranged on the inner sidewall of the drill bit;

[0018] An outer groove is arranged on the outer sidewall of the static pressure soil sampling tube, and the outer groove is matched with the inner step.

[0019] In one embodiment, the inner diameter of the drill bit is large at the top and small at the bottom, the outer diameter of the static pressure soil sampling tube is large at the top and small at the bottom, and the minimum inner diameter of the drill bit is smaller than the maximum outer diameter of the static pressure soil sampling tube.

[0020] In one embodiment, the soil sample cylinder comprises:

[0021] The cylinder body comprises two half-cylinders that can be buckled and opened to each other;

[0022] An elastic film sleeve is sleeved on the entire outer sidewall of the cylinder body, and the upper part and the lower part of the elastic film sleeve are respectively sealed and connected with the top and the bottom of the cylinder body through the upper cover and the lower cover;

[0023] The inner lining elastic sheet is bent and rolled on the inner side wall of the barrel, and the inner part of the inner lining elastic sheet is used for placing the soil sample.

[0024] In one embodiment, the top of the elastic film sleeve is provided with a pulling part, and the bottom of the elastic film sleeve is provided with a notch.

[0025] In one embodiment, the drainage unit comprises:

[0026] A multi-purpose cup is threadedly connected in the inner part of the outer tube, and a drainage hole is formed in the side wall of the multi-purpose cup;

[0027] A ball seat is fixed on the bottom of the multi-purpose cup, and a through hole is arranged on the ball seat and connected with the inner part of the inner tube;

[0028] A sealing ball is arranged on the ball seat, and the sealing ball is used to open or block the through hole.

[0029] In one embodiment, the top of the multi-purpose cup is provided with a wedge-shaped protrusion above the drainage hole.

[0030] In one embodiment, the bottom of the static pressure soil sampler is provided with a knife edge, and the bottom of the soil sample barrel abuts against the inner step of the knife edge.

[0031] A method for using a rotary static pressure full-core soil sampler, comprising the following steps:

[0032] S1, assembling a soil sample barrel;

[0033] S2, placing the soil sample barrel into the static pressure soil sampler, and screwing on the knife edge;

[0034] S3, placing the static pressure soil sampler into the inner tube, and screwing on the drill bit;

[0035] S4, connecting the drill rod to the soil sampler, when the drill rod is rotated downward to drill into the soil layer, the combined double-tube drill is rotated, the downward pressure is transmitted to the axial pressure bearing device through the axial pressing device, and the water pressure makes the static pressure soil sampler and the drill bit not in contact with the inner tube;

[0036] S5, after drilling the soil sample, lifting the soil sampler, unloading the drill bit, removing the static pressure soil sampler, unloading the knife edge, taking out the soil sample barrel, inserting a slightly long section of the elastic film sleeve into the barrel, and sealing the two ends of the barrel with the upper cover and the lower cover to complete the sample sealing;

[0037] S6, moving the sealing ball in the drainage unit, inserting the water pipe, opening the pump to drain water, pushing the identification sample out of the inner tube, and placing the sample;

[0038] S7, cleaning the soil sampler, and repeating steps S1-S6.

[0039] In one of the embodiments, the assembling method of the soil sample cylinder in the step S1 comprises: bending and rolling an inner lining elastic sheet into a half cylinder, buckling another half cylinder, and tightly wrapping the elastic film sleeve on the outer wall of the cylinder body to assemble the soil sample cylinder.

[0040] The rotating static pressure full-core soil sampler and the using method have the following beneficial effects:

[0041] 1) improve the soil sampling efficiency: the drilling and soil sampling are combined, improving the efficiency;

[0042] 2) improve the soil sampling quality: dynamic and static separation, static pressure soil sampling, and small soil sample disturbance;

[0043] 3) wide application range: the soil sample cylinder is provided with a cutting edge, and is suitable for soft soil and hard soil;

[0044] 4) simple structure, convenient for construction operation. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application (20221221), the drawings needed in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0046] Figure 1 is a structural schematic diagram of the rotating static pressure full-core soil sampler of the present application;

[0047] Figure 2 is a structural schematic diagram of the static pressure soil sampling pipe of the present application;

[0048] Figure 3 is a structural schematic diagram of the combined double-pipe drill of the present application;

[0049] Figure 4 is a structural schematic diagram of the soil sample cylinder of the present application;

[0050] Figure 5 is a structural schematic diagram of the elastic film sleeve of the present application. DETAILED DESCRIPTION

[0051] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the related drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0052] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. Where an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can also be present.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0054] Referring to Figures 1-5 An embodiment of the present application provides a rotary static pressure full-core sampler, comprising:

[0055] A static pressure soil sampling tube 1, an inner part of the static pressure soil sampling tube 1 is provided with a soil sample cylinder 2;

[0056] A combined double-tube drill 3, comprising a fixedly connected outer tube 31 and an inner tube 32, a bottom of the outer tube 31 is connected with a drill bit 33, the static pressure soil sampling tube 1 is installed in the inner tube 32, and a pressure transmission unit 4 is arranged between the static pressure soil sampling tube 1 and the inner tube 32, the pressure transmission unit 4 can convert a rotary down pressure of the inner tube 32 into a linear advancing force of the static pressure soil sampling tube 1; wherein a gap 6 is provided between the outer tube 31 and the inner tube 32 and between the drill bit 33 and the static pressure soil sampling tube 1, and the gap 6 is in communication with each other.

[0057] A drainage unit 5 is arranged between the top of the outer tube 31 and the inner tube 32, and the drainage unit 5 can drain mud water generated in the drilling process.

[0058] In an embodiment of the present application, the pressure transmission unit 4 comprises:

[0059] An axial top pressing device 41 is fixed to a lower end of the inner tube 32;

[0060] An axial bearing pressing device 42 is fixed to an outer side wall of the static pressure soil sampling tube 1, and the axial bearing pressing device 41 is in sliding contact with the axial top pressing device 42 when the drill bit 33 is rotating and drilling.

[0061] In the embodiment, when the drill bit 33 rotates and drills downward in the soil layer to form a hole, the outer tube 31 and the inner tube 32 rotate together, the rotary down pressure of the inner tube 32 is transmitted to the static pressure soil sampling tube 1 through the axial bearing pressing device 41 and the axial top pressing device 42, and the water pressure makes the static pressure soil sampling tube 1 not in contact with the drill bit 33 and the inner tube 32 through the gap 6, and no torsional force is transmitted, so that the rotary drilling and sampling of the outer tube 31 and the inner tube 32 and the static pressure sampling of the static pressure soil sampling tube 1 are separated.

[0062] In an embodiment of the present application, a diameter-reducing unit 34 is arranged between the inner side of the drill bit 33 and the outer side of the static pressure soil sampler tube 1, which can limit the position of the static pressure soil sampler tube 1 in the drill bit 33, so that the static pressure soil sampler tube 1 cannot fall off.

[0063] In an embodiment, the diameter-reducing unit 34 comprises an inner step 341 arranged on the inner side wall of the drill bit 33 and an outer groove 342 arranged on the outer side wall of the static pressure soil sampler tube 1, and the outer groove 342 cooperates with the inner step 341.

[0064] In this embodiment, when the soil sampler is pulled out, the static pressure soil sampler tube 1 naturally falls off under the action of gravity, at this time, the outer groove 342 on the outer side wall of the static pressure soil sampler tube 1 cooperates with the inner step 341 on the inner side wall of the drill bit 33, so that the drill bit 33 can be limited and prevented from falling off. In some embodiments, the inner diameter of the drill bit 33 can also be arranged to be large at the top and small at the bottom, and the outer diameter of the static pressure soil sampler tube 1 can also be arranged to be large at the top and small at the bottom, which can also prevent the static pressure soil sampler tube 1 from falling off.

[0065] In an embodiment of the present application, the soil sample cylinder 2 comprises:

[0066] a cylinder body 21 comprising two half-cylinders capable of being buckled and opened to each other;

[0067] an elastic film sleeve 22 sleeved on the entire outer side wall of the cylinder body 21, the upper part and the lower part of the elastic film sleeve 22 being respectively sealed and connected with the top and the bottom of the cylinder body 21 through an upper cover 23 and a lower cover 24;

[0068] an inner lining elastic sheet 25 bent and attached to the inner side wall of the cylinder body 21, the inside of the inner lining elastic sheet 25 being used for placing soil samples.

[0069] In this embodiment, the elastic film sleeve 22 is sleeved on the cylinder body 21 to seal the buckled and slit part of the half-cylinders, thereby improving the sealing performance of the soil sample cylinder. When the soil sample is taken out, the soil sample can be automatically taken out by the inner lining elastic sheet 25, thereby avoiding the disturbance of the soil sample caused by pushing the sample out of the cylinder.

[0070] In an embodiment of the present application, the top of the elastic film sleeve 22 is provided with a pulling component 26. In this way, the elastic film sleeve 22 can be sleeved on the outer surface of the cylinder body 21 through the pulling component 26. Alternatively, the pulling component 5 can be a rope ring or the like. In an embodiment of the present application, the bottom of the elastic film sleeve 22 is provided with a notch 27 for tearing the elastic film sleeve. Alternatively, the shape of the notch 27 can be V-shaped or the like.

[0071] In an embodiment of the present application, the drainage unit 5 comprises:

[0072] A multi-purpose cup 51 is threadedly connected inside the outer tube 31, and a drainage hole 52 is formed in the sidewall of the multi-purpose cup 51; the drainage hole 52 is used to drain the mud water generated during drilling.

[0073] A ball seat 53 is fixed at the bottom of the multi-purpose cup 51, and the ball seat 53 is provided with a through hole in communication with the inside of the inner tube 32;

[0074] A sealing ball 54 is arranged on the ball seat 53, and the sealing ball 54 is used to open or block the through hole.

[0075] In this embodiment, the multi-purpose cup 51 is fixedly connected with the outer tube 31 and the inner tube 32, and the multi-purpose cup 51 and the outer tube 31 are threadedly connected with a mismatched thread, so as to ensure that the two are fixedly connected while water can flow freely through the mismatched thread channel. When the soil sampler is used for drilling and sampling, the soil sample enters the static pressure soil sampler tube 1 and reaches the inside of the inner tube 32, pushes the sealing ball 54 upward and opens the drainage hole to discharge the mud water in the inner tube 32. When the soil sampler is lifted up after the drilling and sampling are completed, the sealing ball 54 falls back to the ball seat 53 to block the inner tube 32 and form a vacuum, thereby preventing the soil sample in the tube from sliding down when the soil sampler is lifted up.

[0076] In an embodiment of the present application, a wedge-shaped protrusion 55 is arranged at the top of the multi-purpose cup 51 and located above the drainage hole 52. In this way, the cleaning water on the inner wall of the drill rod can be prevented from flowing into the multi-purpose cup 51 and blocking the sealing ball 54.

[0077] In an embodiment of the present application, the bottom of the static pressure soil sampler tube 1 is provided with a knife edge 7, and the bottom of the soil sample cylinder 2 abuts against the inner step of the knife edge 7. In this way, the soil sampling and positioning installation of the soil sample cylinder 2 are facilitated.

[0078] An embodiment of the present application provides a use method of a rotary static pressure full-core soil sampler, which comprises the following steps:

[0079] S1, assembling a soil sample cylinder 2;

[0080] S2, placing the soil sample cylinder 2 into the static pressure soil sampler tube 1 and screwing on the knife edge 7;

[0081] S3, placing the static pressure soil sampler tube 1 into the inner tube 32 and screwing on the drill bit 33;

[0082] S4, connecting the soil sampler with a drill rod, when the drill rod is rotated downward to drill a hole in the soil layer, the combined double-tube drill 3 is rotated, the downward pressure is transmitted to the axial pressure bearing device 42 through the axial top pressing device 41, and the water pressure makes the static pressure soil sampler tube 1 and the drill bit 33 and the static pressure soil sampler tube 1 and the inner tube 32 not in contact; so as to not transmit the torsional force and realize the separation of dynamic and static;

[0083] S5, after drilling soil sample, lifting the soil sampler, unloading drill bit 33, removing static pressure soil sampler tube 1, unloading knife edge 7, taking out the soil sample cylinder 2, inserting a slightly long section of elastic film sleeve 22 into the cylinder body 21, and sealing the two ends of the cylinder body 21 with the upper cover 23 and the lower cover 24, completing the sealing of the sample;

[0084] S6, move the sealing ball 54 inside the drainage unit 5, insert the water pipe, open the pump and drain water, push the identification sample out of the inner tube 32, and place the sample;

[0085] S7, clean the soil sampler and repeat steps S1-S6.

[0086] In an embodiment of the present application, the assembly method of the soil sample cylinder 2 in step S1 includes: bending the inner lining elastic sheet 25 into a semicircular cylinder, buckling another semicircular cylinder, and tightly wrapping the elastic film sleeve 22 on the outer wall of the cylinder body 21 to form the soil sample cylinder.

[0087] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0088] The above-mentioned embodiments only express several embodiments of the present application, but cannot be interpreted as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A rotary hydrostatic full core sampler characterized by, The utility model relates to a static pressure soil sampler, a combined double-tube drill and a drainage unit. The static pressure soil sampler comprises a static pressure soil sampler tube with a soil sample cylinder inside; The combined double-tube drill comprises a fixedly connected outer tube and an inner tube, the bottom of the outer tube is connected with a drill bit, the static pressure soil sampler is installed in the inner tube, and a pressure transmission unit is arranged between the static pressure soil sampler and the inner tube, the pressure transmission unit can convert the rotary down pressure of the inner tube into the linear advancing force of the static pressure soil sampler; The drainage unit is arranged between the top of the outer tube and the inner tube, and the drainage unit can drain the mud water generated during drilling. The outer tube and the inner tube are connected with each other through a gap. The soil sample cylinder comprises: a cylinder body comprising two half-cylinders that can be buckled and opened to each other; an elastic film sleeve is sleeved on the entire outer sidewall of the cylinder body, the upper part and the lower part of the elastic film sleeve are respectively sealed and connected with the top and the bottom of the cylinder body through an upper cover and a lower cover; an inner lining elastic sheet is bent and attached to the inner sidewall of the cylinder body, and the inside of the inner lining elastic sheet is used for placing soil samples; the top of the elastic film sleeve is provided with a pulling component, and the bottom of the elastic film sleeve is provided with a notch; the bottom of the static pressure soil sampler is provided with a knife edge, and the bottom of the soil sample cylinder abuts against the inner step of the knife edge.

2. The rotary hydrostatic full- core barrel as claimed in claim 1, wherein The pressure transmission unit comprises: an axial top pressing device fixed at the lower end of the inner tube; an axial bearing pressure device fixed on the outer sidewall of the static pressure soil sampler, which is in sliding contact with the axial top pressing device when the drill bit rotates and drills.

3. The rotary hydrostatic full- core barrel as claimed in claim 2, wherein A reduced diameter unit is arranged between the inner side of the drill bit and the outer side of the static pressure soil sampler, which can limit the position of the static pressure soil sampler in the drill bit so that the static pressure soil sampler cannot fall off.

4. The rotary hydrostatic full- core barrel as claimed in claim 3, wherein The reduced diameter unit comprises: an inner step arranged on the inner sidewall of the drill bit; an outer groove arranged on the outer sidewall of the static pressure soil sampler, which cooperates with the inner step.

5. The rotary hydrostatic full- core barrel as claimed in claim 4, wherein The inner diameter of the drill bit is large at the top and small at the bottom, the outer diameter of the static pressure soil sampler is large at the top and small at the bottom, and the minimum inner diameter of the drill bit is smaller than the maximum outer diameter of the static pressure soil sampler.

6. The rotary hydrostatic full- core barrel as claimed in claim 5, wherein The drainage unit comprises: a multi-purpose cup threadedly connected to the inside of the outer tube, a drainage hole is formed in the sidewall of the multi-purpose cup; a ball seat fixed at the bottom of the multi-purpose cup, the ball seat is provided with a through hole connected with the inside of the inner tube; a sealing ball arranged on the ball seat, which is used to open or block the through hole.

7. The rotary hydrostatic full- core barrel as claimed in claim 6, wherein The top of the multi-purpose cup is provided with a wedge-shaped protrusion above the drainage hole.

8. A method of using a rotary static pressure full core barrel according to any one of claims 1-7, characterized in that, The steps are as follows: S1, assembling a soil sample cylinder; S2, placing the soil sample cylinder into the static pressure soil sampler, and screwing on a knife edge; S3, placing the static pressure soil sampler into the inner tube, and screwing on a drill bit; S4, connecting the soil sampler to the drill rod, when the drill rod rotates and drills downward in the soil layer to form a hole, the combined double-tube drill rotates, the down pressure is transmitted to the axial bearing pressure device through the axial top pressing device, and the water pressure makes the static pressure soil sampler and the drill bit, and the static pressure soil sampler and the inner tube have no contact. S5, after drilling soil sample, lifting the soil sampler, unloading drill bit, removing static pressure soil sampler pipe, unloading knife edge, taking out the soil sample cylinder, putting the elastic film sleeve slightly longer into the cylinder, sealing the two ends of the cylinder with the upper and lower covers, completing the sealing of the sample; S6, move the sealing ball inside the drainage unit, insert the water pipe, open the pump to drain water, push the identification sample out of the inner tube, and place the sample; S7, clean the soil sampler and repeat steps S1-S6.

9. The method of using a rotary hydrostatic full- core barrel as defined in claim 8, wherein, In step S1, the assembly method of the soil sample cylinder includes: bending and rolling the inner lining elastic sheet into a half cylinder, buckling the other half cylinder, and tightly wrapping the elastic film sleeve on the outer wall of the cylinder to form the soil sample cylinder.

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