A sample collection device for soil exploration in a large diameter pilot well

Abstract

The present invention relates to the field of groundwater sampling technology, and specifically to a sample collection device for soil exploration in a large-diameter well, comprising a drill bit and a drill rod, wherein the drill rod is coaxially fixed at the upper end of the drill bit, the drill rod can rotate around its axis, an annular cavity is provided in the circumference of the drill rod, and a plurality of water inlet holes are provided at equal intervals on the circumferential wall of the annular cavity. The present invention is provided with a sealing ring, and when a narrow and long gap appears on the inner circumferential wall of the sampling hole, as the sealing ring expands, the resistance to the sealing ring at the position where the gap appears on the inner circumferential wall of the sampling hole is reduced, and the paste in the storage cavity is squeezed out through the discharge port and filled into the gap position, and the gap is temporarily sealed by the paste, thereby preventing the water layer in other areas from mixing with the water layer in the target sampling area, so as to improve the sample accuracy of the target sampling water layer.

Description

Technical Field

[0001] The invention relates to the technical field of groundwater sampling, in particular to a sample collection device for soil exploration in a large-diameter pilot well. Background Art

[0002] The sample collection device for soil exploration is a professional equipment designed for underground soil exploration. It is used to obtain undisturbed samples or disturbed samples of underground soil in order to analyze the physical properties and mechanical characteristics of the soil. Large-diameter pilot wells often need to collect groundwater samples at different geological depths when conducting soil exploration. When collecting groundwater samples at different geological depths, existing devices usually use packers to isolate the water layer at the target sampling depth from the water layer in other areas to achieve accurate sampling of groundwater in a specific area. However, the existing sampling device has the following problems: Since the inner wall of the pilot well contains hard particles, stones and other materials, it is difficult for the inflated packer to completely isolate the water layer at the target sampling depth from the water layer in other areas, which can easily cause the water layer at the target sampling depth to mix with the water layer in other areas, thereby reducing the accuracy of the collected samples. Summary of the invention

[0003] Through research, it was found that the reason why the inflated seal cannot completely seal the sampling hole is that the surrounding wall of the sampling hole often has a narrow gap extending in the radial direction of the sampling hole, and the inflated seal cannot squeeze into the narrow gap through its own deformation. Based on this, it is necessary to provide a large-diameter guide well soil exploration sample collection device to solve the problem that when the existing device samples the water layer at the target sampling depth, the water layer at the target sampling depth is easily mixed with the water layer in other areas.

[0004] The above purpose is achieved through the following technical solutions:

[0005] A sample collection device for soil exploration in a large-diameter pilot well comprises:

[0006] drill;

[0007] A drill rod, which is coaxially fixedly arranged on the upper end of the drill bit and can rotate around its axis;

[0008] An annular cavity is provided around the drill pipe, and a plurality of water inlet holes are provided at equal intervals on the peripheral wall of the annular cavity;

[0009] A submersible pump is arranged in the annular cavity, the input end of the submersible pump is located in the annular cavity, and the output end of the submersible pump passes through the top of the drill pipe;

[0010] The outer periphery of the drill pipe and the upper and lower parts of the annular cavity are both rotatably provided with packing rings, an annular air chamber is provided inside the packing ring, and a vent is provided on the inner circumference of the packing ring, the vent is connected to the annular air chamber, and the vent can inflate the annular air chamber and discharge the gas in the annular air chamber;

[0011] A material storage cavity is provided inside the sealing ring and outside the annular air chamber, and a paste is stored in the material storage cavity;

[0012] A discharge port is arranged on the outer peripheral surface of the sealing ring, and the discharge port is connected with the material storage cavity.

[0013] In one of the embodiments, a sensing top column is slidably provided in the discharge port, the sensing top column is T-shaped, and an elastic strip is provided between the sensing top column and the inner peripheral wall of the storage cavity.

[0014] In one of the embodiments, a fixed cylinder is rotatably provided on the outside of the drill pipe, a sealing ring is coaxially fixed on the outside of the fixed cylinder, an air inlet is provided on the top of the fixed cylinder, a long air guide hole is opened inside the fixed cylinder, the long air guide hole extends along the axis of the fixed cylinder, the upper end of the long air guide hole is connected to the air inlet, and the air vent is connected to the long air guide hole.

[0015] In one embodiment, the discharge port opened on the outer circumference of the isolation ring above the annular cavity is located at the upper part of the outer circumference of the isolation ring, and the discharge port opened on the outer circumference of the isolation ring below the annular cavity is located at the lower part of the outer circumference of the isolation ring.

[0016] In one embodiment, the paste is a polysulfide sealing paste.

[0017] In one of the embodiments, a filter cartridge is disposed outside the fixed cartridge and in the area where the annular cavity is located, and filter holes are evenly formed on the outer circumference of the filter cartridge.

[0018] In one of the embodiments, a fixing ring is arranged outside the fixing cylinder and between the sealing ring and the filter cylinder. An air jet hole is opened on the outer periphery of the fixing ring. The air jet hole is connected to the long air guide hole. When the air vent inflates the annular air chamber, the air jet hole can spray outward.

[0019] In one embodiment, the upper and lower end surfaces of the isolation ring are both chamfered.

[0020] In one embodiment, the sealing ring is made of nitrile rubber.

[0021] In one of the embodiments, stainless steel fibers are mixed into the chamfered area inside the sealing ring and away from the discharge port.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention is provided with a sealing ring. When a narrow and long gap appears on the inner wall of the sampling hole, as the sealing ring expands, the resistance of the sealing ring at the position where the gap appears on the inner wall of the sampling hole is reduced, and the paste in the storage chamber is squeezed out through the discharge port and filled into the gap. The gap is temporarily sealed by the paste, which prevents the water layers in other areas from mixing with the water layers in the target sampling area, so as to improve the sample accuracy of the target sampling water layer.

[0024] 2. The present invention is provided with an induction top column. After the staff inflates the annular air chamber through the air vent, the outer circumferential surface of the isolation ring gradually expands into an arc shape. At this time, the induction top column gradually penetrates into the inner circumferential wall of the sampling hole, thereby limiting the isolation ring through the induction top column, and indirectly guiding and supporting the rotation of the drill rod to prevent the axis of the drill rod from deviating from the axis of the sampling hole during the rotation of the drill rod. At the same time, the discharge port is opened, and the paste in the storage chamber is discharged outwardly through the discharge port, while the induction top column that has not penetrated into the inner circumferential wall of the sampling hole still blocks the discharge port to prevent the paste in the storage chamber from being ineffectively squeezed out, so as to make the effective utilization rate of the paste squeezed out from the discharge port higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an overall schematic diagram of a sample collection device for soil exploration in a large-diameter pilot well according to the present invention;

[0026] Figure 2 This is an exploded view of a sample collection device for soil exploration in a large-diameter pilot well according to the present invention;

[0027] Figure 3 for Figure 2 A schematic diagram of the enlarged structure in the middle;

[0028] Figure 4 It is a cross-sectional view of a sample collection device for soil exploration in a large-diameter pilot well according to the present invention;

[0029] Figure 5 for Figure 4 Schematic diagram of the enlarged structure at B in the middle;

[0030] Figure 6 for Figure 4 Schematic diagram of the enlarged structure at C in the middle;

[0031] Figure 7 The present invention is a schematic diagram of the connection structure of an induction top column in a sample collection device for soil exploration in a large-diameter pilot well.

[0032] in:

[0033] 100, drill bit; 200, drill rod; 210, annular cavity; 220, water inlet; 300, submersible pump; 400, sealing ring; 410, vent; 420, storage cavity; 430, paste; 440, discharge port; 500, fixing cylinder; 510, air inlet; 520, long air guide hole; 600, filter cylinder; 610, filter hole; 700, fixing ring; 710, air jet hole; 800, square head; 900, induction top column; 910, elastic strip. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] like Figure 1-Figure 6As shown, a sample collection device for soil exploration in a large-diameter well includes a drill bit 100 and a drill rod 200. The drill rod 200 is coaxially fixedly arranged at the upper end of the drill bit 100. The drill rod 200 can rotate around its axis. An annular cavity 210 is opened in the circumference of the drill rod 200. A plurality of water inlet holes 220 are opened at equal intervals on the circumferential wall of the annular cavity 210. A submersible pump 300 is arranged in the annular cavity 210. The input end of the submersible pump 300 is located in the annular cavity 210. The output end of the submersible pump 300 passes through the top of the drill rod 200. The outer circumference of the drill rod 200 and the annular cavity 210 are provided with a plurality of water inlet holes 220. There are rotatable sealing rings 400 above and below the cavity 210, and an annular air chamber is opened inside the sealing ring 400. A vent 410 is also opened on the inner circumference of the sealing ring 400, and the vent 410 is connected to the annular air chamber. The vent 410 can inflate the annular air chamber and discharge the gas in the annular air chamber. A storage chamber 420 is provided inside the sealing ring 400 and outside the annular air chamber. A paste 430 is stored in the storage chamber 420, and a discharge port 440 is opened on the outer circumference of the sealing ring 400, and the discharge port 440 is connected to the storage chamber 420.

[0038] When in use, the staff first determines the location of the sample collection point, then moves the device to the location of the sample collection point, and then starts the drill rod 200, so that the drill rod 200 rotates and feeds downward, and the drill rod 200 drives the drill bit 100 to feed downward and rotate. As the drill rod 200 continues to move downward, the submersible pump 300 moves downward synchronously with the drill rod 200. When the water inlet hole 220 moves to the location of the sampling water layer, the staff then inflates the annular air chamber through the vent 410, so that the volume of the isolation ring 400 gradually expands. The sealing ring 400 gradually comes into contact with the inner wall of the sampling hole. After the sealing ring 400 comes into contact with the inner wall of the sampling hole, as the sealing ring 400 continues to expand, if there is a narrow and long gap somewhere on the wall of the sampling hole, the resistance to the sealing ring 400 at this place is reduced, and the paste 430 in the storage chamber 420 is squeezed out through the discharge port 440 and fills the gap. The gap is temporarily sealed by the paste 430 to prevent the water layers in other areas from mixing with the water layers in the target sampling area, so as to improve the sample accuracy of the target sampling water layer.

[0039] It should also be added that the reason why the sealing ring 400 is rotatably installed on the outer periphery of the drill pipe 200 and above and below the annular cavity 210 is because negative pressure suction will be generated at the vent 410 due to the action of the submersible pump 300. If the sealing ring 400 is not installed below the annular cavity 210, the water layer below the target sampling water layer will flow upward to the target sampling water layer, which is not conducive to improving the sample accuracy of the target sampling water layer.

[0040] It should also be noted that in order to enable the drill rod 200 to rotate around its axis and move along the axis of the drill rod 200, specifically, the drill rod 200 can be driven to rotate by a rotating system (such as a servo motor), and the rotating system and the drill rod 200 can be driven to move up and down by a lifting system, so that the drill rod 200 drives the drill bit 100 to feed downward.

[0041] In a further embodiment, Figure 7 As shown, a sensing top column 900 is slidably provided in the discharge port 440 , the sensing top column 900 is T-shaped, and an elastic strip 910 is provided between the sensing top column 900 and the inner peripheral wall of the storage cavity 420 .

[0042] The staff inflates the annular air chamber through the vent 410, so that the outer peripheral surface of the isolation ring 400 gradually expands into an arc shape. At this time, the induction top column 900 gradually penetrates into the inner peripheral wall of the sampling hole, thereby limiting the isolation ring 400 through the induction top column 900, and indirectly guiding and supporting the rotation of the drill rod 200, so as to prevent the axis of the drill rod 200 from deviating from the axis of the sampling hole during the rotation of the drill rod 200. At the same time, under the pushing action of the inner peripheral wall of the sampling hole, the drill rod 200 penetrates into the sampling hole. The pressure between the sensing top column 900 in the peripheral wall and the inner peripheral wall of the sampling hole gradually overcomes the elastic force of the elastic strip 910, so that the discharge port 430 opens, and the paste 430 in the storage chamber 420 is discharged outward through the discharge port 430, while the sensing top column 900 that has not penetrated into the inner peripheral wall of the sampling hole still blocks the discharge port 430, avoiding the ineffective extrusion of the paste 430 in the storage chamber 420, so as to make the effective utilization rate of the paste 430 squeezed out from the discharge port 430 higher.

[0043] In a further embodiment, Figure 5 and Figure 6 As shown, a fixed cylinder 500 is rotatably provided on the outside of the drill pipe 200, and a sealing ring 400 is coaxially fixedly arranged on the outside of the fixed cylinder 500. An air inlet 510 is provided on the top of the fixed cylinder 500, and a long air guide hole 520 is opened inside the fixed cylinder 500. The long air guide hole 520 extends along the axis of the fixed cylinder 500, and the upper end of the long air guide hole 520 is connected to the air inlet 510, and the air vent 410 is connected to the long air guide hole 520.

[0044] When in use, the staff first connects the external air source to the air inlet 510, and then starts the external air source (such as an air pump) to inflate the air inlet 510. The air enters the long air guide hole 520 through the air inlet 510, and the air further enters the annular air chamber through the vent 410, so that the annular air chamber is inflated and expanded.

[0045] It should be added that the purpose of providing the fixing tube 500 is to prevent the inner circumference of the packing ring 400 from being worn due to the rotation of the drill rod 200, thereby avoiding the service life of the packing ring 400 from being reduced.

[0046] In a further embodiment, Figure 1 As shown, the discharge port 440 opened on the outer circumference of the isolation ring 400 located above the annular cavity 210 is located at the upper part of the outer circumference of the isolation ring 400, and the discharge port 440 opened on the outer circumference of the isolation ring 400 located below the annular cavity 210 is located at the lower part of the outer circumference of the isolation ring 400.

[0047] It can be understood that the reason why the discharge port 440 on the outer peripheral surface of the isolation ring 400 above the annular cavity 210 is opened at the upper part of the outer peripheral surface of the isolation ring 400, and the discharge port 440 on the outer peripheral surface of the isolation ring 400 below the annular cavity 210 is opened at the lower part of the outer peripheral surface of the isolation ring 400, is to reduce the flow distance of the paste 430 and make the paste 430 away from the sampling water layer to prevent the paste 430 from flowing into the sampling water layer and avoid contamination of the water sample in the sampling water layer.

[0048] In a further embodiment, Figure 6 As shown, the paste 430 is a polysulfide sealing paste.

[0049] The reason why polysulfide sealing paste is chosen as the paste 430 is that polysulfide sealing paste is viscous, insoluble in water, and has good water resistance, oil resistance and aging resistance. After the paste 430 is squeezed into the gap, the gap can be sealed to prevent leakage. Moreover, since polysulfide sealing paste is insoluble in water, even if a small amount of polysulfide sealing paste falls into the sampling water layer, the water sample and the polysulfide sealing paste can be separated later.

[0050] In a further embodiment, Figure 2 As shown, a filter cartridge 600 is disposed outside the fixed cartridge 500 and in the area where the annular cavity 210 is located, and filter holes 610 are evenly formed on the outer circumferential surface of the filter cartridge 600 .

[0051] The filter hole 610 is provided to filter the water sample of the sampling water layer to prevent large solid matter in the sampling water layer from entering the submersible pump 300, thereby preventing the input end of the submersible pump 300 from being blocked by the large solid matter.

[0052] In a further embodiment, Figure 3 As shown, a fixing ring 700 is arranged outside the fixing cylinder 500 and between the sealing ring 400 and the filter cylinder 600. An injection hole 710 is opened on the outer periphery of the fixing ring 700. The injection hole 710 is connected to the long air guide hole 520. When the vent 410 inflates the annular air chamber, the injection hole 710 can eject air outward.

[0053] When air is inflated into the long air hole 520, the air flowing into the long air hole 520 is ejected outward through the jet hole 710, and the ejected air fills the area above the annular cavity 210 and between the sealing rings 400 below. At this time, the injected air can slow down the flow speed of the paste 430 above the target sampling water layer, further ensuring the accuracy of sampling.

[0054] In a further embodiment, Figure 6 As shown, the upper and lower end surfaces of the sealing ring 400 are both chamfered.

[0055] When there is a gap between the sealing ring 400 and the peripheral wall of the sampling hole at a certain place, after the air enters the area where the sealing ring 400 is located through the gap, the air will exert a force on the sealing ring 400 through the chamfers at the upper and lower ends of the sealing ring 400, causing the sealing ring 400 to be further squeezed and deformed, so as to squeeze out more paste 430 to quickly block the gap, thereby making the sealing ring 400 better in sealing the peripheral wall of the sampling hole.

[0056] In a further embodiment, the sealing ring 400 is made of nitrile rubber.

[0057] It is understandable that the reason why nitrile rubber is selected as the sealing ring 400 is that nitrile rubber is oil-resistant and wear-resistant. In addition, nitrile rubber is easy to process and shape, and can be made into an annular structure with precise size and complex shape.

[0058] In a further embodiment, Figure 6 As shown, stainless steel fibers are mixed into the chamfered area inside the sealing ring 400 and on the side away from the discharge port 440 .

[0059] It is understandable that this configuration is for the purpose of allowing the air to deform only the chamfered area on one side of the sealing ring 400 close to the discharge port 440 , so as to squeeze out more paste 430 from the discharge port 440 .

[0060] In a further embodiment, Figure 2 As shown, a square head 800 is fixedly provided on the top of the drill rod 200 .

[0061] It is understandable that the square head 800 is provided to facilitate the connection between the drill rod 200 and the transmission system.

[0062] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A sample collection device for soil exploration in a large diameter pilot well, characterized in that: include: drill; A drill rod, which is coaxially fixedly arranged on the upper end of the drill bit and can rotate around its axis; An annular cavity is provided around the drill pipe, and a plurality of water inlet holes are provided at equal intervals on the peripheral wall of the annular cavity; A submersible pump is arranged in the annular cavity, the input end of the submersible pump is located in the annular cavity, and the output end of the submersible pump passes through the top of the drill pipe; The outer periphery of the drill pipe and the upper and lower parts of the annular cavity are both rotatably provided with packing rings, an annular air chamber is provided inside the packing ring, and a vent is provided on the inner circumference of the packing ring, the vent is connected to the annular air chamber, and the vent can inflate the annular air chamber and discharge the gas in the annular air chamber; A material storage cavity is provided inside the sealing ring and outside the annular air chamber, and a paste is stored in the material storage cavity; A discharge port is provided on the outer peripheral surface of the sealing ring, and the discharge port is connected to the storage cavity; a sensing top column is slidably provided in the discharge port, and the sensing top column is T-shaped, and an elastic strip is provided between the sensing top column and the inner peripheral wall of the storage cavity; When in use, the staff inflates air into the annular air chamber through the air vent, so that the outer circumference of the sealing ring gradually expands into an arc shape and presses against the inner circumference wall of the sampling hole. At this time, the sensing top column gradually penetrates into the inner circumference wall of the sampling hole. Under the pushing action of the inner circumference wall of the sampling hole, the pressure between the sensing top column penetrated into the inner circumference wall of the sampling hole and the inner circumference wall of the sampling hole gradually overcomes the elastic force of the elastic strip, so that the discharge port is opened, and the paste in the storage cavity is discharged outward through the discharge port, while the sensing top column that has not penetrated into the inner circumference wall of the sampling hole still blocks the discharge port.

2. A sample collection device for soil exploration in a large diameter pilot well according to claim 1, characterized in that: A fixed cylinder is rotatably provided on the outside of the drill pipe, a sealing ring is coaxially fixed on the outside of the fixed cylinder, an air inlet is provided on the top of the fixed cylinder, a long air guide hole is opened inside the fixed cylinder, the long air guide hole extends along the axis of the fixed cylinder, the upper end of the long air guide hole is connected with the air inlet, and the air vent is connected with the long air guide hole.

3. A sample collection device for soil exploration in a large diameter pilot well according to claim 1, characterized in that: The discharge port opened on the outer peripheral surface of the sealing ring located above the annular cavity is located at the upper part of the outer peripheral surface of the sealing ring, and the discharge port opened on the outer peripheral surface of the sealing ring located below the annular cavity is located at the lower part of the outer peripheral surface of the sealing ring.

4. A sample collection device for soil exploration in a large diameter pilot well according to claim 1, characterized in that: The paste is polysulfide sealing paste.

5. The sample collection device for soil exploration in a large diameter pilot well according to claim 2, characterized in that: A filter cartridge is arranged outside the fixing cartridge and in the area where the annular cavity is located, and filter holes are evenly arranged on the outer peripheral surface of the filter cartridge.

6. A sample collection device for soil exploration in a large diameter pilot well according to claim 5, characterized in that: A fixing ring is arranged outside the fixing cylinder and between the sealing ring and the filter cylinder. An air jet hole is opened on the outer periphery of the fixing ring. The air jet hole is connected to the long air guide hole. When the air vent inflates the annular air chamber, the air jet hole can spray air outward.

7. A sample collection device for soil exploration in a large diameter pilot well according to claim 6, characterized in that: The upper and lower end surfaces of the sealing ring are both provided with chamfers.

8. A sample collection device for soil exploration in a large diameter pilot well according to claim 7, characterized in that: The sealing ring is made of nitrile rubber.

9. A sample collection device for soil exploration in a large diameter pilot well according to claim 6, characterized in that: Stainless steel fibers are mixed in the chamfered area inside the sealing ring and on the side away from the discharge port.

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