CN111257055A - Portable underground water depth-setting sampling device, sampling system and sampling method - Google Patents
Portable underground water depth-setting sampling device, sampling system and sampling method Download PDFInfo
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Abstract
The portable underground water depth-fixing sampling device, the sampling system and the sampling method belong to the field pollution investigation and risk assessment field, and the stagnant water at the upper end and the lower end of the underground water sampling probe in the well pipe is effectively blocked by arranging the movable blocking air bags, so that the underground water sample at the depth of the sampling probe can be accurately collected, the problem that the upper layer and the lower layer of water samples in the well pipe are mixed in the well washing sampling process to cause sample dilution in the traditional method is solved, and the accuracy of detected concentration is improved. The invention can accurately collect underground water samples of different depths in the same monitoring well, realizes depth-fixed sampling and obviously reduces the cost. In addition, the invention effectively blocks the water stagnation of the upper layer and the lower layer of the underground water sampling probe in the well pipe, can reduce the well washing volume before sampling, saves the sampling time, improves the sampling efficiency, reduces the generation amount of well washing wastewater, further reduces the sampling cost, can also reduce the disturbance to the underground water in the well pipe, and ensures the accuracy of the detected concentration.
Description
Technical Field
The invention belongs to the field of site pollution investigation and risk assessment, and particularly relates to a portable underground water depth-fixing sampling device, a sampling system and a sampling method.
Background
According to the law and regulation regulations of China, the land of industrial enterprises left after shutdown and relocation needs to be investigated according to the relevant national technical specifications before being re-developed and utilized, and risk assessment is carried out by combining with future land planning of the field. In the investigation of the pollution condition of the groundwater, the pollution condition is mainly characterized by collecting typical groundwater samples for pollutant detection at present. Due to the spatial heterogeneity of the hydrogeology of the site in all directions, the heterogeneity of the vertical distribution of pollutants in the groundwater is usually obvious, and particularly for the site with a thicker aquifer, the heterogeneity of the vertical distribution is more obvious. Therefore, the method for sampling at fixed depth and analyzing pollutants by collecting underground water samples at different depths is a main technical means for depicting the vertical distribution of pollutants in underground water.
The traditional mode of realizing gathering different degree of depth groundwater typical samples sets up the group well at same monitoring point position, realizes gathering the purpose of different degree of depth typical groundwater samples through setting up the screen pipe in the aquifer different degree of depth. This conventional method requires the construction of a well group, which requires a high cost for drilling and constructing the well. If the underground water is buried deeply and the aquifer is thick, the cost is increased more obviously, and the method becomes a main obstacle for limiting the popularization and the application of the technology. Meanwhile, by adopting the sampling mode, because the stagnant water in the well pipe is large in size, the time consumed for well washing before sampling is long, the sampling efficiency is reduced, and more well washing wastewater is generated, so that the application cost of the technology is further increased.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not to be taken as an admission or any form of suggestion that this information forms the prior art that is already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a portable underground water depth-fixed sampling device, a sampling system and a sampling method, and aims to solve the technical problem that the traditional method for acquiring typical samples of underground water at different depths needs well construction and has high drilling and well construction cost. Particularly, the cost is increased more obviously when the underground water is buried deeper and the aquifer is thicker; and the stagnant water volume in the well pipe is large, the well washing time is long before sampling, the sampling efficiency is reduced, more well washing wastewater is generated, and the technical problem of application cost is increased.
In order to solve the above technical problems, the present invention provides a portable groundwater depth-fixing sampling device, comprising:
the sampling probe is of a hollow structure, and the side wall of the sampling probe is provided with a pore for the entry of pollutants;
the separation air bag comprises a probe top air bag connected to the top end of the sampling probe and a probe bottom air bag connected to the bottom end of the sampling probe, the top and the bottom of the probe top air bag are communicated through a second connecting pipe, and the probe top air bag and the probe bottom air bag are also communicated through a first connecting pipe;
the gas supply mechanism comprises an inflation tube connected with the top of the airbag at the top end of the probe and an inflation device connected with the end part of the inflation tube, and the inflation tube is provided with a barometer and an air tightness valve;
well washing and sampling mechanism includes the sampling tube of being connected with probe top gasbag top and connects the self-priming sample pump at the sampling tube tip, be equipped with the gas tightness valve on the sampling tube, be connected with the sample pump on the self-priming sample pump and export the water pipe.
Preferably, the sampling probe is sleeved with a centering device, the centering device is of a plate-shaped structure, a probe limiting hole for the sampling probe to pass through is formed in the center of the centering device, and a connecting pipe limiting hole for the first connecting pipe to pass through is further formed in the centering device.
Preferably, water through holes are symmetrically formed in the centering device.
Preferably, sampling probe includes inside bushing pipe, the cover establishes the outside sleeve pipe outside inside bushing pipe and connects between inside bushing pipe top and outside sleeve pipe top, connects the stifled cap between inside bushing pipe bottom and outside sleeve pipe bottom, all seted up the hole on inside bushing pipe and the outside sleeve pipe to the aperture in hole is greater than the aperture in hole on the outside sleeve pipe on the inside bushing pipe, be connected with quick-operation joint on the stifled cap, sampling probe communicates with probe top gasbag and probe bottom gasbag respectively through the quick-operation joint at both ends.
Preferably, the first connecting pipe and the second connecting pipe are both rigid pipes made of corrosion-resistant materials, and the sampling pipe and the gas filling pipe are both flexible pipes made of corrosion-resistant materials.
In addition, the invention also provides a portable groundwater depth-fixing sampling system, which comprises the portable groundwater depth-fixing sampling device, and further comprises:
the well pipe device is vertically arranged along the center of a well hole and comprises a sieve pipe, a solid pipe which is continuously connected with the top of the sieve pipe and a pipe plug which is connected with the bottom of the sieve pipe in a sealing way, and the sampling probe and the blocking air bag are arranged in the sieve pipe;
the filter material and the blocking device sequentially comprise a filter material layer, a blocking layer and a sealing layer from bottom to top, wherein the filter material layer is arranged between the outer wall of the sieve tube and the wall of the well hole, and the top of the filter material layer exceeds the top of the sieve tube.
Preferably, the diameter of the sampling probe is 1/2 of the inner diameter of the sieve tube, and the length of the sampling probe is 0.5m-1.5 m.
Preferably, the filter material layer is quartz sand, the blocking layer is bentonite slurry, and the sealing layer is cement slurry.
In addition, the invention also provides a sampling method by using the portable groundwater depth-fixing sampling system, which comprises the following steps:
step one, determining a groundwater sampling monitoring point position and drilling to form a well hole;
vertically installing the well pipe device in the well hole to ensure that the well pipe device is positioned in the center of the well hole;
filling a filter material layer, a barrier layer and a sealing layer between the outer wall of the well pipe device and the well hole wall, and ensuring that the top of the filter material layer exceeds the top of the sieve pipe;
step four, installing the portable underground water depth-fixing sampling device;
fifthly, after the portable underground water fixed-depth sampling device is placed along the inner side wall of the well pipe device to set the sampling depth, an air tightness valve on an inflation pipe is opened, an inflation device is started, and an air bag at the top end of the probe and an air bag at the bottom end of the probe are inflated until the air bags at the top end of the probe and the bottom end of the probe are tightly attached to the inner wall of the sieve pipe;
step six, closing an air tightness valve on the gas filling pipe, closing the gas filling device, opening the air tightness valve on the sampling pipe, starting the self-suction sampling pump, and starting well washing;
connecting a water outlet pipe of the sampling pump with a self-suction sampling pump, and collecting an underground water sample;
step eight, closing an air tightness valve on the sampling tube, closing the self-suction sampling pump, opening the air tightness valve on the inflation tube, and decompressing an air bag at the top end of the probe and an air bag at the bottom end of the probe;
and step nine, lowering the portable groundwater depth-fixing sampling device to another designed sampling depth, repeating the step five to the step eight, and collecting groundwater samples with corresponding depths.
Preferably, the method for installing the portable groundwater depth-fixing sampling device in the fourth step comprises the following steps:
step one, respectively connecting a probe top end air bag and a probe bottom end air bag to two ends of a sampling probe, and respectively connecting two ends of a first connecting pipe with the probe top end air bag and the probe bottom end air bag;
step two, connecting one end of a sampling tube with the top of the air bag at the top end of the probe, and communicating the other end of the sampling tube with an air tightness valve and a self-suction sampling pump;
and step three, connecting one end of an inflation tube with the top of the air bag at the top end of the probe, and communicating the other end of the inflation tube with a barometer, an air tightness valve and an inflation device.
Compared with the prior art, the invention has the characteristics and beneficial effects that:
(1) according to the portable underground water depth-fixing sampling system, the movable blocking air bags are arranged, so that the stagnant water at the upper end and the lower end of the underground water sampling probe in the well pipe is effectively blocked, the underground water sample at the depth of the sampling probe can be accurately collected, the problem that the samples are diluted due to the fact that the upper layer water sample and the lower layer water sample in the well pipe are mixed in the well washing sampling process in the traditional method is solved, and the accuracy of detected concentration is improved.
(2) The portable underground water depth-fixing sampling system can accurately collect underground water samples with different depths in the same monitoring well by moving the blocking air bag up and down, realizes depth-fixing sampling, and obviously reduces the cost of realizing depth-fixing sampling through constructing a well group compared with the traditional method.
(3) The portable underground water depth-fixing sampling system provided by the invention effectively blocks the upper and lower layers of stagnant water of the underground water sampling probe in the well pipe by using the blocking air bag in the sampling process, so that the well washing volume before sampling can be reduced, the sampling time is saved, the sampling efficiency is improved, the generation amount of well washing wastewater is reduced, and the sampling cost is further reduced.
(4) The portable underground water depth-fixing sampling system utilizes the blocking air bag to effectively block the upper and lower layers of stagnant water of the underground water sampling probe in the well pipe, effectively reduces disturbance to the underground water in the well pipe, and ensures the accuracy of detected concentration.
(5) The portable groundwater depth-fixing sampling system has the advantages of simple structure, convenience in installation and simple and convenient sampling method, and has important significance for perfecting the current groundwater sampling technical system and supporting groundwater pollution investigation of polluted sites in China.
Drawings
FIG. 1 is a schematic structural diagram of a portable groundwater depth-fixing sampling device.
Fig. 2 is a schematic plan view of the centralizer.
Fig. 3 is a schematic elevation view of a probe tip balloon.
FIG. 4 is a schematic top view of the probe tip balloon.
Fig. 5 is a schematic elevation structure view of the air bag at the bottom end of the probe.
Fig. 6 is a schematic structural diagram of a sampling probe.
FIG. 7 is a schematic structural diagram of a portable groundwater depth-fixing sampling system.
Figure 8 is a schematic view of a well tubular device.
The attached drawings are marked as follows: 1-sampling probe, 101-inner liner tube, 102-outer sleeve tube, 103-blocking cap, 2-blocking air bag, 21-probe top end air bag, 22-probe bottom end air bag, 3-first connecting tube, 4-inflation tube, 5-inflation device, 6-sampling tube, 7-self-suction type sampling pump, 8-sampling pump water outlet tube, 9-centering device, 91-probe limiting hole, 92-connecting tube limiting hole, 93-water through hole, 10-second connecting tube, 11-sieve tube, 12-solid tube, 13-pipe plug, 14-filter material layer, 15-blocking layer and 16-sealing layer.
Detailed Description
In order to make the technical means, innovative features, objectives and functions realized by the present invention easy to understand, the present invention is further described below.
The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in figures 1-6, the portable groundwater depth-fixing sampling device comprises a sampling probe 1, a blocking air bag 2, an air supply mechanism and a well washing and sampling mechanism.
The sampling probe 1 is a hollow structure and the side wall thereof is provided with a pore for the entry of pollutants. The sampling probe 1 specifically comprises an inner liner tube 101, an outer casing 102 sleeved outside the inner liner tube 101, and a blocking cap 103 connected between the top of the inner liner tube 101 and the top of the outer casing 102 and between the bottom of the inner liner tube 101 and the bottom of the outer casing 102, wherein holes are formed in the inner liner tube 101 and the outer casing 102, the hole diameter of each hole in the inner liner tube 101 is larger than that of each hole in the outer casing 102, a quick connector is connected to the blocking cap 103, and the sampling probe 1 is respectively communicated with a probe top end air bag 21 and a probe bottom end air bag 22 through the quick connectors at two ends. The inner liner 101 has a wall thickness of 1.5mm, a diameter of 22mm and a height of 60 cm. The inner liner 101 is provided with 8 rows of holes with a diameter of 4 mm. The outer sleeve 102 has a wall thickness of 0.4mm, a diameter of 24mm and a height of 60 cm. The outer sleeve 102 has an 18 mesh opening therein. The two ends of the sampling probe 1 are provided with external thread quick connectors, the inner diameter of each connector is 8-10mm, and the sampling probe 1 is respectively connected with a probe top air bag 21 and a probe bottom air bag 22 through the quick connectors.
In order to ensure that the sampling probe 1 does not move in the sampling process, the sampling probe 1 is externally sleeved with the centering device 9, the centering device 9 is of a plate-shaped structure, the center position of the centering device 9 is provided with a probe limiting hole 91 for the sampling probe 1 to pass through, and the centering device 9 is also provided with a connecting pipe limiting hole 92 for the first connecting pipe 3 to pass through. The probe limiting hole 91 is a threaded hole, and the connecting pipe limiting hole 92 is a circular hole, the diameter of which is slightly larger than the outer diameter of the first connecting pipe 3. In order to reduce the obstruction of the center 9 to liquid, the center 9 of the present invention is symmetrically provided with water holes 93. The centralizer 9 employs 2/3 of well bore diameter with a thickness of 20-30 mm.
The separation gasbag 2 is including connecting probe top gasbag 21 and the probe bottom gasbag 22 of connecting in the 1 bottom of sampling probe at the 1 top of sampling probe, communicate through second connecting pipe 10 between the top of probe top gasbag 21 and the bottom, still communicate through first connecting pipe 3 between probe top gasbag 21 and the probe bottom gasbag 22. The first connecting pipe 3 and the second connecting pipe 10 are both rigid pipes made of corrosion-resistant materials. The second connecting pipe 10 mainly ensures the connectivity of the whole underground water sampling pipeline and the air tightness of the separation air bag, and ensures that the separation air bag can expand after being inflated. If the second connecting pipe 10 is not arranged, the gas enters the pipe through the sampling probe 1 after inflation, the water in the well pipe is aerated, the blocking air bag cannot expand, and a groundwater sample cannot be taken. The first connecting tube 3 is used to connect the probe tip airbag 21 and the probe base airbag 22, so that the probe tip airbag 21 can be inflated through the air inlet of the probe tip airbag 21, and the two airbags can be inflated after being filled with air.
The center of the top end of the probe top end air bag 21 is provided with an external thread socket type air tightness quick connector, the fastening piece fixes the air tightness quick connector on the top of the probe top end air bag 21 in a threaded mode, and the inner diameter of the air tightness quick connector is matched with the outer diameter of the sampling tube 6 and is usually 6-8 mm. And one side of the air tightness quick connector is also provided with another external thread socket type air tightness quick connector, the air tightness quick connector is fixed at the top of the air bag 21 at the top end of the probe through a fastener in a threaded manner, and the inner diameter of the connector is matched with the outer diameter of the inflation tube 4, and is usually 4-6 mm.
The center of probe top gasbag 21 bottom also is provided with external screw thread socket joint formula gas tightness quick-operation joint, and the fastener is fixed in probe top gasbag 21 bottom with this gas tightness quick-operation joint screw thread, and this gas tightness quick-operation joint's internal diameter matches with the external diameter of the hickey on 1 top of sampling probe, and this gas tightness quick-operation joint is connected with the quick-operation joint on 1 top of sampling probe with threaded connection's mode. An external thread socket type air tightness quick connector is further arranged on one side of the air tightness quick connector, the air tightness quick connector is fixed at the bottom of the air bag 21 at the top end of the probe through a fastener in a threaded mode, and the inner diameter of the air tightness quick connector is matched with the outer diameter of the first connecting pipe 3 and is usually 4-6 mm. The two ends of the second connecting pipe 10 are connected with the airtight quick connectors at the two ends of the probe tip air bag 21 in a socket-and-spigot manner in an airtight manner.
The top center of probe bottom gasbag 22 is provided with external screw thread socket joint formula gas tightness quick-operation joint, and the fastener is fixed in the top of probe bottom gasbag 22 with this gas tightness quick-operation joint screw thread, and the internal diameter of this gas tightness quick-operation joint is connected with the quick-operation joint of sampling probe 1 bottom, and another gas tightness quick-operation joint has been seted up to one side of this gas tightness quick-operation joint, and the internal diameter of this gas tightness quick-operation joint matches with the external diameter of first connecting pipe 3, and is 4-6mm usually.
The gas supply mechanism comprises an inflation tube 4 connected with the top of the air bag 21 at the top end of the probe and an inflation device 5 connected with the end part of the inflation tube 4, and a barometer and an air tightness valve are arranged on the inflation tube 4. The gas-filled tube 4 is a flexible tube made of corrosion-resistant material.
The well washing and sampling mechanism comprises a sampling tube 6 connected with the top of the probe top end air bag 21 and a self-suction sampling pump 7 connected to the end part of the sampling tube 6, wherein an air tightness valve is arranged on the sampling tube 6, and a sampling pump water outlet pipe 8 is connected to the self-suction sampling pump 7. The sampling tube 6 is a flexible tube made of corrosion-resistant material.
Fig. 7-8 show a portable groundwater depth-fixing sampling system, which comprises the portable groundwater depth-fixing sampling device, a well pipe device, a filter material and a blocking device.
The well pipe device is vertically arranged along the center of a well hole and comprises a screen pipe 11, a solid pipe 12 connected to the top of the screen pipe 11 and a pipe plug 13 connected to the bottom of the screen pipe 11 in a sealing way, wherein the sampling probe 1 and the blocking air bag 2 are arranged in the screen pipe 11. The diameter of the sampling probe 1 is 1/2 of the inner diameter of the sieve tube 11, and the length of the sampling probe 1 is 0.5m-1.5 m.
The filter material and blocking device sequentially comprises a filter material layer 14, a blocking layer 15 and a sealing layer 16 from bottom to top, wherein the filter material layer 14 is arranged between the outer wall of the sieve tube 11 and the wall of the well hole, and the top of the filter material layer 14 exceeds the top of the sieve tube 11. The filter material layer 14 is quartz sand, the blocking layer 15 is bentonite slurry, and the sealing layer 16 is cement slurry.
The method for sampling by using the portable groundwater depth-fixing sampling system comprises the following steps:
the method comprises the following steps of firstly, screening and determining underground water sampling and monitoring points according to information such as site pollution facility distribution, historical monitoring data and site pollution traces, and drilling at the determined underground water sampling and monitoring points by a drilling machine to form a well hole. During drilling, the casing is followed all the way around, preventing the borehole wall from collapsing.
And step two, vertically installing the well pipe device in the well hole to ensure that the well pipe device is positioned in the center of the well hole.
And step three, filling a filter material layer 14, a barrier layer 15 and a sealing layer 16 between the outer wall of the well pipe device and the wall of the well hole, and ensuring that the top of the filter material layer 14 exceeds the top of the sieve tube 11. During field installation, the frit layer 14 and barrier layer 15 may be funneled at the surface directly from the surface down the void. Wherein, in the process of filling the barrier layer 15, at every 0.5m dry bentonite particles, not less than 2L of clean water is required to be added into the barrier layer 15 to ensure that the dry bentonite particles expand after absorbing water. Barrier layer 15 is filled to about 0.5m above ground level and seal layer 16 is poured until about 0.1 m above ground level.
And step four, installing the portable underground water depth-setting sampling device. The installation method of the portable underground water depth-setting sampling device comprises the following steps:
A. the centralizers 9 are fixed at two ends of the sampling probe 1 through the probe limiting holes 91, and the circle centers of the connecting pipe limiting holes 92 on the centralizers 9 at the two ends are ensured to be on the same straight line. The first connecting pipe 3 is then connected to the connecting pipe limiting hole 92 of the centering device 9 at both ends.
B. The probe top end airbag 21 and the probe bottom end airbag 22 are respectively connected to both ends of the sampling probe 1, and both ends of the first connecting tube 3 are respectively connected to the probe top end airbag 21 and the probe bottom end airbag 22. Specifically, the probe tip airbag 21 is first connected to the tip of the sampling probe 1 by a screw thread, and the probe tip airbag 21 is connected to the tip of the first connection tube 3 by a screw thread. Then the probe bottom air bag 22 is in threaded connection with the bottom end of the sampling probe 1, and the probe bottom air bag 22 is in threaded connection with the bottom end of the first connecting pipe 3.
C. One end of the sampling tube 6 is connected with the top of the air bag 21 at the top end of the probe, and the other end is communicated with the air tightness valve and the self-suction sampling pump 7.
D. One end of the inflation tube 4 is connected with the top of the probe top end air bag 21, and the other end is communicated with the barometer, the air tightness valve and the inflation device 5.
And fifthly, after the portable underground water depth-setting sampling device is placed along the inner side wall of the well pipe device to set the sampling depth, the air tightness valve on the inflation pipe 4 is opened, the inflation device 5 is started, and the probe top end air bag 21 and the probe bottom end air bag 22 are inflated until the pressure of the system displayed by the barometer is higher than the hydrostatic pressure at the bottom end of the probe bottom end air bag 22 and is not less than 0.05MPa, so that the probe top end air bag 21 and the probe bottom end air bag 22 are ensured to be tightly attached to the inner.
And step six, closing an air tightness valve on the inflation tube 4, closing the inflation device 5, opening the air tightness valve on the sampling tube 6, starting the self-suction sampling pump 7, and starting well washing until the well washing volume is 3-5 times of the stagnant water volume deposited in the well pipe between the air bag 22 at the bottom end of the probe and the air bag 21 at the top end of the probe.
And step seven, connecting a water outlet pipe 8 of the sampling pump with a self-suction sampling pump 7, and collecting the underground water sample until the volume of the collected underground sample meets the volume requirement when the laboratory carries out pollutant concentration detection.
Step eight, closing an air tightness valve on the sampling tube 6, closing the self-suction sampling pump 7, opening an air tightness valve on the inflation tube 4, and decompressing the probe top end air bag 21 and the probe bottom end air bag 22.
And step nine, lowering the portable groundwater depth-fixing sampling device to another designed sampling depth, repeating the step five to the step eight, and collecting groundwater samples with corresponding depths.
The above examples are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (10)
1. The utility model provides a portable groundwater depthkeeping sampling device which characterized in that includes:
the sampling probe (1) is of a hollow structure, and the side wall of the sampling probe is provided with a pore for pollutants to enter;
the separation air bag (2) comprises a probe top end air bag (21) connected to the top end of the sampling probe (1) and a probe bottom end air bag (22) connected to the bottom end of the sampling probe (1), the top and the bottom of the probe top end air bag (21) are communicated through a second connecting pipe (10), and the probe top end air bag (21) and the probe bottom end air bag (22) are also communicated through a first connecting pipe (3);
the gas supply mechanism comprises an inflation tube (4) connected with the top of the probe top end airbag (21) and an inflation device (5) connected with the end part of the inflation tube (4), and a barometer and an air tightness valve are arranged on the inflation tube (4);
well washing and sampling mechanism includes sampling tube (6) of being connected with probe top gasbag (21) top and connects self-priming sample pump (7) at sampling tube (6) tip, be equipped with the gas tightness valve on sampling tube (6), be connected with sample pump outlet pipe (8) on self-priming sample pump (7).
2. A portable groundwater depth sampling device according to claim 1, wherein: the sampling probe (1) is sleeved with a centering device (9), the centering device (9) is of a plate-shaped structure, a probe limiting hole (91) for the sampling probe (1) to pass through is formed in the center of the centering device, and a connecting pipe limiting hole (92) for the first connecting pipe (3) to pass through is further formed in the centering device (9).
3. A portable groundwater depth sampling device according to claim 2, wherein: the centering device (9) is also symmetrically provided with water through holes (93).
4. A portable groundwater depth sampling device according to claim 1, wherein: sampling probe (1) is established outside sleeve pipe (102) outside inside bushing pipe (101) including inside bushing pipe (101), cover and is connected between inside bushing pipe (101) top and outside sleeve pipe (102) top, connects stifled cap (103) between inside bushing pipe (101) bottom and outside sleeve pipe (102) bottom, all seted up the hole on inside bushing pipe (101) and outside sleeve pipe (102) to the aperture of hole is greater than the aperture of hole on outside sleeve pipe (102) on inside bushing pipe (101), be connected with quick-operation joint on stifled cap (103), sampling probe (1) communicates with probe top gasbag (21) and probe bottom gasbag (22) respectively through the quick-operation joint at both ends.
5. A portable groundwater depth sampling device according to claim 1, wherein: the first connecting pipe (3) and the second connecting pipe (10) are both rigid pipes made of corrosion-resistant materials, and the sampling pipe (6) and the gas filling pipe (4) are both flexible pipes made of corrosion-resistant materials.
6. A portable groundwater depth-fixing sampling system, characterized by comprising a portable groundwater depth-fixing sampling apparatus according to any one of claims 1 to 5, further comprising:
the well pipe device is vertically arranged along the center of a well hole and comprises a sieve pipe (11), a solid pipe (12) which is continuously connected to the top of the sieve pipe (11) and a pipe plug (13) which is connected to the bottom of the sieve pipe (11) in a sealing way, wherein the sampling probe (1) and the blocking air bag (2) are both arranged in the sieve pipe (11);
the filter material and the blocking device sequentially comprise a filter material layer (14), a blocking layer (15) and a sealing layer (16) from bottom to top, wherein the filter material layer (14) is arranged between the outer wall of the sieve tube (11) and the wall of the well hole, and the top of the filter material layer (14) exceeds the top of the sieve tube (11).
7. A portable groundwater depth referencing sampling system according to claim 6, wherein: the diameter of the sampling probe (1) is 1/2 of the inner diameter of the sieve tube (11), and the length of the sampling probe (1) is 0.5m-1.5 m.
8. A portable groundwater depth referencing sampling system according to claim 6, wherein: the filter material layer (14) is quartz sand, the blocking layer (15) is bentonite slurry, and the sealing layer (16) is cement slurry.
9. A method for sampling with a portable groundwater depth sampling system according to any one of claims 6 to 8, characterized by comprising the steps of:
step one, determining a groundwater sampling monitoring point position and drilling to form a well hole;
vertically installing the well pipe device in the well hole to ensure that the well pipe device is positioned in the center of the well hole;
filling a filter material layer (14), a barrier layer (15) and a sealing layer (16) between the outer wall of the well pipe device and the wall of the well hole, and ensuring that the top of the filter material layer (14) exceeds the top of the sieve pipe (11);
step four, installing the portable underground water depth-fixing sampling device;
fifthly, after the portable underground water depth-setting sampling device is placed downwards along the inner side wall of the well pipe device to set the sampling depth, an air tightness valve on an inflation pipe (4) is opened, an inflation device (5) is started, and a probe top end air bag (21) and a probe bottom end air bag (22) are inflated until the probe top end air bag (21) and the probe bottom end air bag (22) are tightly attached to the inner wall of the sieve pipe (11);
step six, closing an air tightness valve on the gas filling pipe (4), closing the gas filling device (5), opening the air tightness valve on the sampling pipe (6), starting the self-suction sampling pump (7), and starting well washing;
connecting a water outlet pipe (8) of the sampling pump with a self-suction sampling pump (7) to collect an underground water sample;
step eight, closing an air tightness valve on the sampling tube (6), closing the self-suction sampling pump (7), opening the air tightness valve on the inflation tube (4), and decompressing a probe top end air bag (21) and a probe bottom end air bag (22);
and step nine, lowering the portable groundwater depth-fixing sampling device to another designed sampling depth, repeating the step five to the step eight, and collecting groundwater samples with corresponding depths.
10. A method for sampling by using a portable groundwater depth positioning sampling system according to claim 9, wherein the method for installing the portable groundwater depth positioning sampling device in the fourth step comprises the following steps:
step one, a probe top end air bag (21) and a probe bottom end air bag (22) are respectively connected to two ends of a sampling probe (1), and two ends of a first connecting pipe (3) are respectively connected with the probe top end air bag (21) and the probe bottom end air bag (22);
step two, one end of a sampling tube (6) is connected with the top of a probe top end air bag (21), and the other end of the sampling tube is communicated with an air tightness valve and a self-suction sampling pump (7);
and step three, connecting one end of an inflation tube (4) with the top of the probe top end air bag (21), and communicating the other end with a barometer, an airtight valve and an inflation device (5).
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