Miniature underground water collecting device

Abstract

The invention provides a miniature underground water collecting device which comprises a drill rod, a sampling drilling tool, a sampling pipe and a collector, one end of the sampling pipe is connected with the collector, and the other end of the sampling pipe is connected with the sampling drilling tool; the sampling drilling tool comprises a drill bit and a well body, and the drill bit is arranged at the bottom end of the well body; the well body comprises a permeable layer covering the periphery of the sampling pipe and a degradation shell covering the periphery of the material layer; a water inlet hole is formed in the pipe wall of the sampling pipe wrapped by the permeable layer; the sampling pipe and the well body are sleeved with the drill rod, and the bottom end of the drill rod abuts against the top end of the drill bit. According to the miniature underground water collecting device, the well building success rate and the well building efficiency are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of water pollution detection, and in particular relates to a micro groundwater collection device. Background Art

[0002] For the detection of groundwater, it is necessary to build sampling wells in the detection area and take groundwater samples from the sampling wells for detection and analysis. However, the current process of drilling and well construction involves many complex steps such as drilling and well wall treatment. Each step requires a large number of professional technicians and special equipment, and the construction efficiency is limited. Specifically, first of all, large drilling rigs and various drill bits are required in the drilling stage. These equipment are not only expensive but also energy-intensive. Secondly, a large amount of chemical materials and mechanical equipment are required in the well wall treatment stage. In addition, in the traditional well construction and drilling process, quartz sand and bentonite need to be filled for filling, but they are often unable to be filled due to the excessive depth and the small pores in the pipe wall, resulting in the blockage of the well opening pores, and ultimately leading to the failure of well construction. Not only does it waste a lot of time and resources, it may also cause irreversible damage to groundwater resources. In addition, at present, after the well is built, it is only washed by simple pumping. The return water speed of many wells is fast, resulting in a large amount of silt in the well, affecting the quality of the sample. In this case, not only is frequent cleaning and maintenance required, but it may also shorten the service life of the well, further increasing resource consumption and environmental burden. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a micro groundwater collection device to improve the success rate and efficiency of well construction.

[0004] To solve the above technical problems, the embodiments of the present invention adopt the following technical solutions: An embodiment of the present invention provides a micro groundwater collection device, comprising a drill rod, a sampling drill tool, a sampling tube and a collector, wherein one end of the sampling tube is connected to the collector, and the other end is connected to the sampling drill tool; the sampling drill tool comprises a drill bit and a well body, and the drill bit is arranged at the bottom end of the well body; the well body comprises a collection tube, a permeable layer covering the outer periphery of the collection tube, and a degradable shell covering the outer periphery of the permeable layer; the sampling tube is connected to the collection tube; a water inlet hole is arranged on the tube wall of the collection tube; a drill ring is arranged at the top end of the drill bit for abutting against the bottom end of the drill rod.

[0005] As a further improvement of the embodiment of the present invention, the collection tube and the sampling tube are an integrated structure.

[0006] As a further improvement of the embodiment of the present invention, an expansion material is provided above the water-permeable layer, and the expansion material is coated on the outer circumference of the collection tube and is coated by the degradable shell.

[0007] As a further improvement of the embodiment of the present invention, it also includes a flushing air pipe, an internal flushing component is provided in the well body, and the flushing air pipe is connected to the internal flushing component; the internal flushing component is used to flush the collection cavity of the collection pipe.

[0008] As a further improvement of an embodiment of the present invention, the internal flushing assembly includes a plurality of upper flushing tubes and a plurality of lower flushing tubes, and the upper flushing tubes and the lower flushing tubes are both arranged on the outer wall of the collection tube; the upper flushing tubes are connected to the sampling tube through an upper flushing port, and the lower flushing tubes are connected to the collection tube through a lower flushing port; the center line of the upper flushing port is inclined upward, and the center line of the lower flushing port is inclined downward.

[0009] As a further improvement of the embodiment of the present invention, each upper flushing pipe has multiple upper flushing ports, and the multiple upper flushing ports are evenly distributed along the circumference of the collection pipe; each lower flushing pipe has multiple lower flushing ports, and the multiple lower flushing ports are evenly distributed along the circumference of the collection pipe.

[0010] As a further improvement of the embodiment of the present invention, it also includes a pulse cleaning pipe, an external flushing component is provided in the well body, and the pulse cleaning pipe is connected to the external flushing component; the external flushing component is used to flush the permeable layer.

[0011] As a further improvement of an embodiment of the present invention, the external flushing assembly includes multiple pulse gas distribution pipes, which are evenly distributed in the permeable layer along the circumference of the collection pipe; a single pulse gas distribution pipe is arranged axially along the well body, and pulse gas outlets are evenly provided on the pulse gas distribution pipe.

[0012] As a further improvement of the embodiment of the present invention, a pump is further included, wherein the air suction pipe of the pump is connected to the collector, and the air outlet pipe of the pump is connected to the flushing air pipe.

[0013] As a further improvement of the embodiment of the present invention, the diameter of the well body is 1 to 5 cm.

[0014] Compared with the prior art, the technical solution of the present invention has the following beneficial effects: (1) The micro groundwater collection device provided by the present invention uses a drill rod and a drill bit to send the well body and the sampling tube to a designated position underground. After the drill rod is pulled out, the degradation shell of the well body located at the outermost layer degrades and disappears, directly forming a groundwater sampling well. The groundwater enters the collection cavity of the collection tube through the permeable layer and the water inlet holes on the wall of the collection tube in turn, and then is extracted through the sampling tube to achieve groundwater collection. After drilling, there is no need to fill the well, and a groundwater sampling well is directly formed, which improves the success rate of well construction, realizes the integrated operation of well drilling and cementing, greatly simplifies the well construction process, and improves the efficiency of well construction.

[0015] (2) The micro groundwater collection device provided by the present invention has an expansion material disposed between the collection tube located at the upper part of the well body and the degradable shell. After the drill rod is pulled out, the degradable shell degrades and the expansion material expands, forming a dense water-proof layer with the soil above the permeable layer, isolating the water above from flowing downward and affecting the accuracy of sampling.

[0016] (3) The micro groundwater collection device provided by the present invention has an external flushing component and an internal flushing component arranged in the well body. Before collecting groundwater samples, pulse gas is first introduced into the pulse gas distribution pipe through the pulse cleaning pipe. The pulse gas flushes the permeable layer through the pulse gas outlet, effectively preventing the permeable layer from being blocked, and ensuring the successful collection of groundwater samples. Then, gas is introduced into the internal flushing component through the flushing gas pipe, and enters the collection cavity of the collection tube through the upper flushing pipe and the lower flushing pipe, forming upward vortex and downward vortex in the collection cavity. After the collection cavity is fully cleaned, the cleaning liquid is extracted, and groundwater is collected only after there is no turbidity in the extracted water body. The well is fully washed to ensure the purity of the groundwater sample and improve the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a micro groundwater collection device according to an embodiment of the present invention; Figure 2 It is a schematic structural diagram of a sampling drill in a micro groundwater collection device according to an embodiment of the present invention; Figure 3 It is a structural schematic diagram of an external flushing component and an internal flushing component in a micro groundwater collection device according to an embodiment of the present invention; Figure 4 It is a cross-sectional view of the lower flushing pipe in the micro groundwater collection device according to an embodiment of the present invention.

[0018] In the figure: sampling drill 1, flushing air pipe 2, sampling tube 3, collector 4, pump 5, solar power generation component 6, discharge pipe 7, waste water bucket 8, pulse cleaning tube 9, drill bit 101, outer ring 102, collection tube 103, permeable layer 104, expansion material 105, lower flushing pipe 106, lower flushing port 1061, upper flushing pipe 107, degradation shell 108, pulse gas distribution pipe 109, pulse gas outlet 1010. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is described in detail below.

[0020] The embodiment of the present invention provides a micro groundwater collection device, such as Figure 1 As shown, it includes a sampling drill 1, a sampling tube 3 and a collector 4, one end of the sampling tube 3 is connected to the collector 4, and the other end is connected to the sampling drill 1. Figure 2As shown, the sampling drill 1 includes a drill bit 101 and a well body, and the bottom end of the well body is fixedly connected to the drill bit 101. The well body includes a collection tube 103, a water-permeable layer 104 coated on the outer periphery of the collection tube 103, and a degradable shell 108 coated on the outer periphery of the water-permeable layer 104. A water inlet hole is provided on the tube wall of the collection tube 103, and a collection cavity is formed in the collection tube 103. The sampling tube 3 is connected to the collection tube 103. An outer ring 102 for abutting against the bottom end of the drill rod is provided at the top of the drill bit 101. Among them, the degradable shell 108 is made of easily degradable materials such as kraft paper and polyester porous mesh. Granular materials such as fine sand or plastic balls are filled between the degradation shell 108 and the sampling tube 3 to form a water-permeable layer 104. During production, the granular materials such as fine sand or plastic balls are fixed around the collection tube 103 by the degradation shell 108, thereby forming a finished well body. It is convenient for direct on-site construction and reduces the time for temporary assembly on site. It also ensures the quality of well construction and prevents irregular on-site assembly from causing blockage in well construction.

[0021] Preferably, the diameter of the well body is 1 to 5 cm. A small well body does not affect the collection of groundwater and is easy to set in the drill pipe. It is convenient and easy to operate. For sites with inconvenient transportation and complex terrain, it can quickly reach the designated point for construction. The construction is simple, the resistance to be overcome is small, and the use of large facilities is omitted. It is green, energy-saving and consumption-reducing.

[0022] During operation, the drill rod of the drilling rig is sleeved outside the sampling tube 3 and the well body, and the bottom end of the drill rod abuts against the outer ring 102 at the top of the drill bit 101. The drilling rig drives the drill rod to drill downward, and the drill rod presses the drill bit downward to drive the well body and the sampling tube to move downward in the soil. After reaching the designated position, the drill rod is pulled out, the degradation shell 108 of the well body degrades and disappears, the permeable layer 104 contacts the groundwater, and the groundwater enters the collection cavity of the collection tube 103 through the permeable layer 104 and the water inlet holes on the wall of the collection tube 103 in turn, and then is drawn out through the sampling tube and collected by the collector 4 to realize the collection of groundwater.

[0023] The micro groundwater collection device provided in this embodiment directly delivers the prefabricated well body to the specified location through drilling. After drilling, there is no need to fill the well, and a groundwater sampling well is directly formed, thereby improving the success rate of well construction and realizing the integrated operation of well drilling and cementing, which greatly simplifies the well construction process and improves the well construction efficiency.

[0024] Preferably, the sampling tube 3 and the collecting tube 103 are an integrated structure, which can reduce the connection of pipelines and simplify the device structure.

[0025] As a preferred example, Figure 2As shown, an expansion material 105 is provided above the water-permeable layer 104, and the expansion material 105 is coated on the outer periphery of the collection tube and is covered by the degradable shell 108. The expansion material can be a material with strong water absorption and expansion, which is made of an elastomer (such as rubber, silicone rubber) or a composite of polyurethane foam and a water-absorbent polymer (such as sodium polyacrylate, polyacrylamide).

[0026] In this embodiment, an expansion material is arranged between the collection tube located at the upper part of the well body and the degradation shell. After the drill rod is pulled out, the degradation shell degrades and the expansion material expands, forming a dense aquiclude layer with the soil above the permeable layer, isolating the groundwater above from flowing downward, thereby affecting the accuracy of sampling.

[0027] Preferably, the micro groundwater collection device of this embodiment further includes a flushing air pipe 2, such as Figure 2 As shown, an internal flushing assembly is provided in the well body, and the flushing air pipe 2 is connected to the internal flushing assembly. The internal flushing assembly is used to flush the collection cavity of the collection tube 103. Before collecting groundwater samples, the internal flushing assembly is inflated through the flushing air pipe 2. After the gas enters the sampling cavity, the water in the sampling cavity is disturbed, thereby cleaning the sampling cavity. After there is no turbidity in the extracted water, the ventilation is stopped and the groundwater is collected.

[0028] Further preferably, the internal flushing assembly includes a plurality of upper flushing pipes 107 and a plurality of lower flushing pipes 106, such as Figure 2 As shown, the upper flushing pipe 107 and the lower flushing pipe 106 are both arranged on the outer wall of the collection tube 103. The upper flushing pipe 107 is connected to the sampling tube through the upper flushing port, and the center line of the upper flushing port is inclined upward. After the gas enters the sampling cavity through the upper flushing port, it moves upward and washes the middle and upper part of the sampling cavity. The lower flushing pipe 106 is connected to the collection tube through the lower flushing port 1061, and the center line of the lower flushing port is inclined downward. After the gas enters the sampling cavity through the lower flushing port, it moves downward and washes the middle and lower part of the sampling cavity.

[0029] Preferably, Figure 4 As shown, each upper flushing pipe has multiple upper flushing ports, and the multiple upper flushing ports are evenly arranged along the circumference of the collection tube. On the same cross-section, there is an angle between the center line of the upper flushing port and the diameter of the collection tube. Multiple streams of gas from the same upper flushing pipe entering the collection tube form an upward vortex in the sampling chamber, enhancing the flushing effect on the middle and upper part of the collection tube. Each lower flushing pipe has multiple lower flushing ports 1061, and the multiple lower flushing ports are evenly arranged along the circumference of the collection tube. On the same cross-section, there is an angle between the center line of the lower flushing port 1061 and the diameter of the collection tube. Multiple streams of gas from the same lower flushing pipe entering the collection tube form a downward vortex in the sampling chamber, enhancing the flushing effect on the middle and lower part of the collection tube. All-round cleaning of the collection chamber is achieved, the well is fully washed, the purity of the groundwater sample is ensured, and the detection accuracy is improved.

[0030] As a preferred example, the micro groundwater collection device of this embodiment further includes a pulse cleaning tube 9, such as Figure 3 As shown, an external flushing assembly is provided in the well body, and a pulse cleaning pipe 9 is connected to the external flushing assembly. The external flushing assembly is used to flush the permeable layer 104. Before collecting groundwater samples, pulse gas is introduced into the external flushing assembly through the pulse cleaning pipe 9, and the pulse gas flushes the permeable layer to prevent the permeable layer from being blocked and affecting the collection of groundwater. By using pulse gas, the permeable layer is flushed with intermittent pressure, which makes it easier to flush away the debris blocking the hole, thereby achieving the transparent effect of the sampling device.

[0031] Further preferably, Figure 3 As shown, the external flushing assembly includes a plurality of pulse gas distribution pipes 109, which are evenly distributed in the permeable layer along the circumference of the collection pipe. A single pulse gas distribution pipe 109 is arranged along the axial direction of the well body, and pulse gas outlets 1010 are evenly arranged on the pulse gas distribution pipe. The permeable layer can be flushed in all directions in the height direction and the circumferential direction, effectively preventing the permeable layer from being blocked, and ensuring that groundwater samples can be collected smoothly.

[0032] Preferably, the micro groundwater collection device of this embodiment further comprises a pump 5, the air extraction pipe of the pump 5 is connected to the collector 4, and the air outlet pipe of the pump 5 is connected to the flushing air pipe 2 and the pulse cleaning pipe 9. The pump 5 is used to provide gas to the flushing air pipe 2 for cleaning the collection pipe, to provide pulse gas to the pulse cleaning pipe 9 for flushing the permeable layer, and to extract liquid from the collection pipe, thereby improving the utilization rate of the pump 5 and simplifying the structure of the entire device.

[0033] Preferably, the micro groundwater collection device of this embodiment further includes a solar power generation component 6, which is used to power the pump 5, thereby improving energy utilization and reducing resource consumption.

[0034] The working process of the micro groundwater collection device in the above embodiment is as follows: The drill rod of the drilling rig is sleeved outside the sampling tube 3 and the well body, and the bottom end of the drill rod is in contact with the outer ring 102 at the top of the drill bit 101. The drilling rig drives the drill rod to drill downward, and the drill rod presses the drill bit downward to drive the well body and the sampling tube to move downward in the soil. After reaching the specified position, the drill rod is pulled out. The degradation shell 108 of the well body degrades and disappears, and the expansion material 105 expands, forming a dense water-proof layer with the soil above the permeable layer, isolating the groundwater from flowing downward. The permeable layer 104 contacts the groundwater, and the groundwater enters the collection cavity of the collection tube 103 through the water inlet holes on the permeable layer 104 and the wall of the collection tube 103 in turn. Start the inflation function of the pump 5, and pass the pulse gas into the pulse gas distribution tube 109 through the pulse cleaning tube 9. The pulse gas is ejected through the pulse gas outlet 1010 to perform all-round flushing of the fine sand of the permeable layer in the height direction and the circumferential direction. At the same time, gas is introduced into the upper flushing tube 107 and the lower flushing tube 106 through the flushing air pipe 2. The multiple streams of gas entering the collection tube from the same upper flushing tube disturb the water in the sampling chamber, forming an upward vortex in the sampling chamber, and cleaning the middle and upper parts of the sampling chamber. The multiple streams of gas entering the collection tube from the same lower flushing tube disturb the water in the sampling chamber, forming a downward vortex in the sampling chamber, and cleaning the middle and lower parts of the sampling chamber. After a preset time period, the inflation function of the pump is stopped, the suction function of the pump is turned on, and the fluid in the collection tube is sucked into the collector through the sampling tube, and then discharged into the waste water bucket 8 through the discharge pipe 7. If the sucked water is turbid, stop the suction function of the pump, turn on the inflation function of the pump, and then flush until there is no turbidity in the pumped water. Turn on the suction function of the pump to collect groundwater.

[0035] The basic principles, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above specific embodiments, and the descriptions in the above specific embodiments and the specification are only for further illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed for protection.

Claims

1. A micro groundwater collection device, characterized in that: The invention comprises a drill rod, a sampling drill tool (1), a sampling tube (3) and a collector (4); one end of the sampling tube (3) is connected to the collector (4), and the other end is connected to the sampling drill tool (1); the sampling drill tool (1) comprises a drill bit (101) and a well body, and the drill bit (101) is arranged at the bottom end of the well body; the well body comprises a collection tube (103), a water-permeable layer (104) covering the outer periphery of the collection tube, and a degradable shell (108) covering the outer periphery of the water-permeable layer; the sampling tube (3) is connected to the collection tube (103); a water inlet hole is arranged on the tube wall of the collection tube (103); and a drill ring (102) is arranged at the top end of the drill bit (101) for abutting against the bottom end of the drill rod.

2. The micro groundwater collection device according to claim 1, characterized in that: The collection tube (103) and the sampling tube (3) are an integrated structure.

3. The micro groundwater collection device according to claim 2, characterized in that: An expansion material (105) is provided above the water-permeable layer (104); the expansion material (105) is coated on the outer circumference of the collection tube and is coated by a degradable shell (108).

4. The micro groundwater collection device according to claim 1, characterized in that: It also comprises a flushing air pipe (2), an internal flushing assembly is provided in the well body, and the flushing air pipe (2) is connected to the internal flushing assembly; the internal flushing assembly is used to flush the collection cavity of the collection pipe.

5. The micro groundwater collection device according to claim 4, characterized in that: The internal flushing assembly comprises a plurality of upper flushing tubes (107) and a plurality of lower flushing tubes (106), wherein the upper flushing tubes and the lower flushing tubes are both arranged on the outer wall of the collection tube; the upper flushing tubes are connected to the sampling tube via an upper flushing port, and the lower flushing tubes are connected to the collection tube via a lower flushing port; the center line of the upper flushing port is inclined upward, and the center line of the lower flushing port is inclined downward.

6. The micro groundwater collection device according to claim 5, characterized in that: Each upper flushing pipe has multiple upper flushing ports, and the multiple upper flushing ports are evenly distributed along the circumference of the collection pipe; each lower flushing pipe has multiple lower flushing ports, and the multiple lower flushing ports are evenly distributed along the circumference of the collection pipe.

7. The micro groundwater collection device according to claim 1, characterized in that: It also comprises a pulse cleaning pipe (9), an external flushing assembly is provided in the well body, and the pulse cleaning pipe (9) is connected to the external flushing assembly; the external flushing assembly is used to flush the permeable layer (104).

8. The micro groundwater collection device according to claim 7, characterized in that: The external flushing component comprises a plurality of pulse gas distribution pipes (109), which are evenly distributed in the permeable layer along the circumference of the collection pipe; a single pulse gas distribution pipe (109) is arranged along the axial direction of the well body, and pulse gas outlets (1010) are evenly arranged on the pulse gas distribution pipe.

9. The micro groundwater collection device according to claim 4, characterized in that: It also comprises a pump (5), wherein the air extraction pipe of the pump (5) is connected to the collector (4), and the air outlet pipe of the pump (5) is connected to the flushing air pipe (2).

10. The micro groundwater collection device according to claim 1, characterized in that: The diameter of the well body is 1 to 5 cm.

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