JP2007255137A - Water sampling device and water sampling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water sampling device and a water sampling method, which enable accurate and slow sampling of water in a deep underground pit with a small diameter without stirring the water in the pit. <P>SOLUTION: The water sampling device 2 includes a body 3, a cable 5, and a controller 27. The body 3 has: a weight 6; and a water storage portion 9 which is connected to the weight 6, has a waster sampling space, and has a water sampling check electrode 14. The body 3 has: a water sampling tube 21 having one end formed into a water sampling inlet 20 and the other end communicating with the water storage portion 9 via a first small solenoid valve 23; and an air vent tube 25 having an upper end formed into an opening H1 and a lower end communicating with the water storage portion 9 via a second small solenoid valve 24. The controller 27 is set on the ground, and causes the first and second solenoid valves 23 and 24 to open and close. Air is sealed in the water storage portion 9, and the body 3 is hung and lowered to a desired position in the underground pit 4 to lead water into the storage portion 9, then the operation of the water sampling check electrode 14 is checked. Subsequently, the storage portion 9 is sealed, and the body 3 is lifted up and recovered. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a water sampling apparatus and a water sampling method used for water quality survey of groundwater.

  In general, in the field of water quality surveys, it is required not only to collect water at an accurate depth, but also to avoid disturbing the water in the borehole. Actually, the site of the boring may be at a relatively deep position where the groundwater reaches, for example, about 45 m from the ground surface of the boring hole to the groundwater surface. Conventionally, a groundwater sampler 202 having a simple structure as shown in FIGS. 3A and 3B is known. The groundwater sampling device 202 includes a bottomed hollow cylindrical main body 203, and a lower valve seat 204 is formed at the bottom of the main body 203. An upper valve seat 205 is attached to the upper part of the main body 203. The upper and lower valve seats 204 and 205 are formed with valve holes 204A and 205A having substantially the same diameter on the same center. A movable valve 209 having packings 207 and 208 that simultaneously open and close the upper and lower valve holes 204A and 205A is attached to the main body 203 at both ends of the vertical axis 206, respectively. The main body 203 is connected to the rope 211 via a lifting tool 210 at the upper end, and is suspended from the boring hole. As shown in FIG. 3A, when the groundwater sampler 202 is suspended in the borehole to be observed and lowered in the observation well, the packing 207 receives upward flowing water pressure due to the downward movement. The movable valve 209 is displaced upward relative to the main body 203, the upper and lower valve holes 204A and 205A are opened, and descend while passing water inside. When a predetermined water sampling depth is reached, the water sampling device 202 is lifted by the rope 211. Then, the packing 208 receives downward flowing water pressure, and the movable valve 209 is displaced downward relative to the main body 203. Both the packings 207 and 208 are seated on the valve seats 204 and 205, and the upper and lower valve holes 204A and 205A. Is closed, water is confined inside the main body 203, and is recovered in that state. In addition, as shown in FIGS. 4A and 4B, there is also known a method of limiting the position of the water sampling layer 303 to be water sampling using a packer 302 made of rubber or the like.

  In the water sampler 202 and the method using the water sampler 202 shown in FIGS. 3A and 3B, when the water in the borehole is lowered, the water in the water sampler is gradually replaced. Therefore, there is a problem that the upper and lower mixing of the sample is large and it is difficult to accurately sample the groundwater of a relatively thin aquifer. Further, in the method using the packer 302 of FIG. 4, as shown in FIG. 4B, when the water permeability of the water sampling layer is low, a larger amount of groundwater than the leaching amount from the water sampling layer is obtained by a pump or the like. If you try to forcibly draw water, water leaks at the packer.

Conventionally, as a device for collecting groundwater of an arbitrary depth in the underground hole, a simple groundwater sampling device (for example, refer to Patent Document 1), a device for collecting water using a vacuum pump or a submersible pump (for example, In addition, a sampling method and a water sampler (see, for example, Patent Document 3) are known in which a piston is operated using air pressure as a signal and water is collected into a vacuum tube through a needle.
JP 2002-54382 A (page 3, FIG. 1) JP-A-7-225178 (second page, FIG. 1) Japanese Examined Patent Publication No. 1-3335 (2nd page, FIGS. 2 (A) to (D))

  However, in the conventional water sampling apparatus and water sampling method, for example, when water is collected using a simple groundwater water sampler, the water in the water sampler is gradually replaced when the water in the borehole is lowered. Therefore, there is a problem that the upper and lower mixing of the sample is large and it is difficult to accurately sample the groundwater of a relatively thin aquifer. In addition, for example, an apparatus that collects water using a vacuum pump or a submersible pump has a problem that if the depth is deep, the head is insufficient and cannot be used. Even if it is used at a usable depth, since the dead water portion in the hose becomes large, the amount of water collected increases, and there is a risk that the bore water will be greatly disturbed in the bore hole having a small hole diameter. Furthermore, although it is possible to limit the aquifer used as a water collection object using a packer, in that case, there exists a problem that an object is restricted to an aquifer with favorable water permeability.

  The present invention has been made in order to solve the above-described problems, and can collect water accurately and at a moderate rate without disturbing the water in the hole even in an underground hole having a deep depth and a small hole diameter. An object of the present invention is to provide a water sampling apparatus and method that can be used.

  A water sampling apparatus according to a first aspect of the present invention includes a water storage section in which a water sampling space is formed, a sensor that detects completion of water sampling in the water storage section, a water sampling port formed at one end, and the other end as a first. A main body having a water sampling introduction passage that is communicated with the water storage section via the valve and an air vent passage whose upper end is communicated with the outside air and whose lower end is communicated with the water storage section via the second valve. Elevating means for hanging up and down in the underground hole is provided, and is electrically connected to the sensor and the first and second valves, respectively, and controls to open and close the first and second valves according to the operation of the sensor. The means are installed on the ground.

  In the water sampling apparatus according to the first aspect of the present invention, a water storage section in which a water sampling space is formed, a sensor that detects completion of water sampling in the water storage section, a water sampling port is formed at one end, and the other end is a first valve. A main body having a water sampling introduction passage communicated with the water storage section through the basin, and an air vent passage whose upper end communicates with the outside air and whose lower end communicates with the water storage section through the second valve. And a control means for opening and closing the first and second valves according to the operation of the sensor. The control means is connected to the sensor and the first and second valves, respectively. By installing on the ground, the first and second valves are opened on the ground, outside air is introduced into the water reservoir, these valves are closed, and the main body with the water reservoir as the air chamber is placed in the underground water in the underground hole by the lifting means. Suspend and first and second valves at specified depth Opening a, together with air in the water storage portion is discharged to the outside through the air vent passage is introduced into the reservoir through the water sampling introduction passage from Mizuguchi adopted groundwater in underground hole. When the water level rises in the water storage section and the sensor detects water, a detection signal is sent from the sensor to the control means, and the control means closes the first and second valves to confine water in the water storage section. When water is confined in the water reservoir, the body is pulled up to the ground by the lifting means. For this reason, on the ground, the depth position and timing of sampling can be controlled, and even if the depth of the underground hole is deep, water can be accurately sampled without disturbing the water in the hole. .

  In the water sampling apparatus according to claim 2, the control means is provided with a display unit for displaying the presence or absence of the sensor operation.

  In the water sampling apparatus according to the second aspect, the control means is provided with the display unit that displays the presence or absence of the sensor operation, so that the completion of the water sampling can be confirmed on the ground.

  Furthermore, in the water sampling apparatus according to claim 3, the water sampling inlet passage is provided with a filter portion between the water sampling port and the first valve, and the air vent passage is provided with a backflow prevention valve. Is.

  In the water sampling apparatus according to claim 3, the water sampling introduction passage is provided with a filter portion between the water sampling port and the first valve, and the air vent passage is provided with a backflow prevention valve. Since the external ground water passes through the filter part and is guided into the water storage part, the sampled water can be freed of impurities and ensure more accurate water quality. Further, the backflow prevention valve prevents water from flowing back into the air vent passage.

  In the water sampling apparatus according to claim 4, the control means closes the first and second valves based on a detection signal from the sensor.

  In the water sampling apparatus according to claim 4, the control means automatically closes the first and second valves based on the detection signal from the sensor, so that when the operation of the sensor is confirmed by the control means on the ground, the control means automatically Since the water storage section is closed, the water storage section is shut off from the outside as soon as the water sampling is completed, and the sample once sampled is not mixed. For this reason, water sampling can be performed accurately.

  The water sampling device according to claim 5 is provided with a water quality measuring device attached to the main body, and a display device that is electrically connected to the water quality measuring device and displays measurement data sent from the water quality measuring device is installed on the ground. Is.

  In the water sampling apparatus according to claim 5, a water quality measuring device is attached to the main body, and a display device that is electrically connected to the water quality measuring device and displays measurement data sent from the water quality measuring device is installed on the ground. In order to suspend the main body by the lifting means and lead it to the desired depth position, the data such as water depth (water level), electrical conductivity (water quality), water temperature, etc. by the water quality measuring instrument are observed on the ground with the display device sequentially. The main body can be moved to a desired position. For this reason, it can be confirmed at a glance whether the position of the water sampling port is at a desired water depth or aquifer, an accurate water sampling sample can be obtained, and the water sampling operation is made efficient.

  In the water sampling apparatus according to claim 6, the first and second valves are each constituted by a small electromagnetic valve.

  In the water sampling apparatus according to claim 6, since the first and second valves are each constituted by a small electromagnetic valve, the diameter of the main body can be reduced, for example, by a small diameter boring hole having a diameter of about 50 mm. Even if there is, water can be collected.

  The water sampling method according to the second aspect of the present invention includes a water storage section in which a water sampling space is formed, a sensor for detecting completion of water sampling in the water storage section, a water sampling port formed at one end, and the other end being the first. A main body having a water sampling introduction passage that is communicated with the water storage section via the valve and an air vent passage whose upper end is communicated with the outside air and whose lower end is communicated with the water storage section via the second valve. The lift is configured to be lifted and lowered freely in the underground hole, is installed on the ground, and is electrically connected to the sensor and the first and second valves, respectively. A control means for opening and closing the second valve is provided, and a first step of introducing outside air into the water storage section of the main body and closing the first second valve by the control means, and air is confined in the water storage section. The main body is Suspend to a desired position in the water, open the first and second valves by the control means, the second step of introducing water into the water storage unit while discharging the air in the water storage unit to the outside, and the operation of the sensor inside the water storage unit In this case, the first and second valves are closed by the control means, the third step of confining the water in the water storage section, and the body in which the water is confined in the water storage section is lifted to the ground by the lifting means. And a fourth step of collecting.

  In the water sampling method according to the second aspect of the present invention, a water storage part in which a water sampling space is formed, a sensor for detecting completion of water sampling in the water storage part, a water sampling port is formed at one end, and the other end is the first. A main body having a water sampling introduction passage that is communicated with the water storage section via the valve and an air vent passage whose upper end is communicated with the outside air and whose lower end is communicated with the water storage section via the second valve. The lift is configured to be lifted and lowered freely in the underground hole, is installed on the ground, and is electrically connected to the sensor and the first and second valves, respectively. A control means for opening and closing the second valve is provided, and a first step of introducing outside air into the water storage section of the main body and closing the first second valve by the control means, and air is confined in the water storage section. The main body in the underground hole by lifting means Suspended to a desired position in the sewage, opened the first and second valves by the control means, and the second step of introducing water into the water storage unit while discharging the air in the water storage unit to the outside, and the operation of the sensor to store the water Considering the completion of water sampling in the unit, the first and second valves are closed by the control means, the third step of confining the water in the water storage part, and the main body in which the water is confined in the water storage part is pulled up to the ground by the lifting means In the first step, air is sealed in the water storage part of the main body to form an air chamber, and in the second step, the main body is suspended to a desired position. In the third step, water is introduced into the water storage unit, the first and second valves are closed by the control means according to the operation of the sensor in the third step, the water storage unit is sealed, and the main body is recovered in the fourth step. ing. For this reason, it is possible to control the depth position and timing of sampling on the ground, and accurately and efficiently collect water without disturbing the water in the hole even if the depth of the underground hole is deep. be able to.

  In the water sampling method according to claim 8, a water quality measuring device is attached to the main body, and a display device that is electrically connected to the water quality measuring device and displays measurement data sent from the water quality measuring device is installed on the ground. Then, after determining the hanging position of the lifting means based on the data displayed on the display device, water is collected.

  In the water sampling method according to claim 8, a water quality measuring device is attached to the main body, and a display device that is electrically connected to the water quality measuring device and displays measurement data sent from the water quality measuring device is installed on the ground. , After deciding the hanging position of the lifting means based on the data displayed on the display device, water is collected, so that the main body is suspended by the lifting means and led to a desired depth position. The main body can be moved to a desired position while sequentially observing data such as water depth (water level), electrical conductivity (water quality), and water temperature by a water quality measuring device on the ground. For this reason, it can be confirmed at a glance whether the position of the water sampling port is at a desired water depth or aquifer, and the position of the water sampling port can be quickly determined.

  In the water sampling apparatus according to the present invention, a water storage section in which a water sampling space is formed, a sensor that detects completion of water sampling in the water storage section, a water sampling port is formed at one end, and the other end is connected via the first valve. A main body having a water sampling introduction passage that communicates with the water storage section and an air vent passage that communicates with the outside air at the upper end and communicates with the water storage section through the second valve at the lower end can be moved up and down to the underground hole. Elevating means for hanging down is provided, and a control means is provided on the ground, which is electrically connected to the sensor and the first and second valves, respectively, and opens and closes the first and second valves according to the operation of the sensor. Therefore, on the ground, the depth position and timing of sampling can be controlled, and even if the depth of the underground hole is deep, it can be accurately sampled without disturbing the water in the hole. .

  Further, in the water sampling method according to the present invention, a weight part, a water storage part connected to the weight part to form a water sampling space, a sensor for detecting completion of water sampling in the water storage part, and a water sampling port at one end A water sampling introduction passage formed at the other end and communicated with the water storage portion via the first valve, and an air vent passage whose upper end communicates with the outside air and whose lower end communicates with the water storage portion via the second valve. The main body includes an elevating means for suspending and lowering the main body in the underground hole, and is installed on the ground and electrically connected to the sensor and the first and second valves. The control means for displaying the presence or absence of the operation and for opening and closing the first and second valves is provided, and the outside air is introduced into the water storage portion of the main body and the control means closes the first and second valves. 1 step and in the water reservoir The main body in which the water is confined is hung down to a desired position in the underground water in the underground hole by the lifting means, the first and second valves are opened by the control means, and the air in the water storage section is discharged to the water storage section. When the operation of the sensor is confirmed by the second step of introducing water and the control means, it is regarded that the water sampling is completed in the water storage section, the first and second valves are closed by the control means, and the water is confined in the water storage section. And a fourth step in which the main body in which water is confined in the water storage section is pulled up to the ground by the lifting means and collected. The timing can be controlled, and even if the depth of the underground hole is deep, water can be collected accurately and efficiently without disturbing the water in the hole.

  For the purpose of accurately collecting water at a desired position even in a deep hole, the water sampling device has a water storage part equipped with a sensor for detecting the completion of water sampling and a water sampling port at one end. A main body having a water sampling introduction passage whose other end communicates with the water storage section via the first valve, an air vent passage whose upper end communicates with outside air, and a lower end communicates with the water storage section, Lifting and lowering means that hangs up and down freely, and is electrically connected to the sensor and the first and second valves, respectively, and opens and closes the first and second valves according to the operation of the sensor. It was realized by installing the control means to operate on the ground.

  Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. FIG. 1 is a configuration diagram of a water sampling apparatus according to the present embodiment. As shown in FIG. 1, the water sampling apparatus 2 according to the present embodiment includes a main body 3 and a rope (elevating means) 5 for suspending the main body 3 in the underground hole 4. The main body 3 includes a weight portion 6 formed in a conical shape on the lower side and a cylindrical shape on the upper side, a filter portion 7 screwed to the upper end of the weight portion 6 via an O-ring (not shown), and the filter portion. 7 is provided with a water storage section 9 that is detachably coupled to the upper end of 7 via a connection section 8. The water reservoir 9 is constituted by a bottomed cylindrical acrylic pipe having an outer diameter of 40 mm and an inner diameter of 34 mm, and is replaceable. The water reservoir 9 is made up of a plurality of types having different vertical lengths, and the amount of water collected can be appropriately selected within the range of 170 to 850 ml depending on the length. The rope 5 may be operated by a winding device (not shown) capable of feeding a predetermined length based on a command signal from a control device (not shown).

  At the upper end of the water storage part 9, a pressure-resistant part 10 in which a space is formed and the air is sealed is detachably attached. The pressure-resistant portion 10 includes a disk-shaped bottom lid 11. The bottom lid 11 is attached so as to close the upper end opening of the water reservoir 9. The bottom lid 11 is provided with a water inlet / outlet port 12 through which water enters and exits, an air inlet / outlet port 13 through which air enters / exits, and a stainless steel water sampling confirmation electrode (sensor) 14 that detects completion of water sampling. When water is introduced into the water storage unit 9 and the level rises and reaches the upper part, the water collection confirmation electrode 14 detects the water level and sends a signal to the outside. The signal from the water collection confirmation electrode 14 is regarded as a signal for completion of water sampling.

  The main body 3 is provided with a water sampling pipe (water sampling introduction passage) 21 having a water sampling port 20 opened at the lower end of the weight section 6 and the other end communicating with the water storage section 9 through the water inlet / outlet 12. The water sampling pipe 21 communicates with the disposable filter 22 inside the filter unit 7 from the water sampling port 20, and further led to the outside from the filter unit 7, and is provided with a first small solenoid valve (first filter) provided in the pressure-resistant unit 10. It is connected to the water inlet / outlet 12 via a valve 23. The water sampling tube 21 is formed to have an inner diameter of 2 mm and an outer diameter of 4 mm, and is attached to the weight part 6 and the water storage part 9 with a tape (not shown). The water inlet / outlet 12 is provided with an introduction pipe 15 having a lower end opened to the lower surface of the water storage unit 9. The first small solenoid valve 23 can shut off the communication of the water sampling pipe 21 by a control signal from the outside.

  The lower end of the main body 3 is connected to the air inlet / outlet 13 and extends upward through a second small solenoid valve (second valve) 24 provided in the pressure-resistant portion 10, and the upper end opening H <b> 1 is groundwater or outside air. An air vent pipe (air vent passage) 25 communicating with the air vent is provided. The upper end opening H1 of the air vent pipe 25 may be in groundwater or may reach the outside air on the ground. The air vent pipe 25 includes a backflow prevention valve 26 that prevents backflow of water. The air vent pipe 25 is supported on the cable 5 by a tape (not shown). The second small solenoid valve 24 can block the communication of the air vent pipe 25 by a control signal from the outside. By using the small solenoid valves 23 and 24, the main body 3 can be made compact so that water can be collected even with a small diameter boring hole 4 having a diameter of about 50 mm.

  By the way, the water collection confirmation electrode 14 of the pressure | voltage resistant part 10 and the 1st and 2nd small solenoid valves 23 and 24 are each electrically connected with the control apparatus (control means) 27 arrange | positioned on the ground. The control device 27 is electrically connected to the power source 28. The control device 27 turns on and off the power supply and lights up when the control switch 30 that opens and closes the first and second small solenoid valves 23 and 24 according to the turning position and when the control switch 30 is turned on. And a power lamp 31. The control device 27 is provided with an operation confirmation lamp (display unit) 29 that is turned on when the water collection confirmation electrode 14 is operated. The detection signal due to the operation of the water sampling confirmation electrode 14 is regarded as a signal for completion of water sampling, and the lighting of the operation confirmation lamp 29 is a sign for notifying the operator that the water sampling has been completed. The control device 27 opens and closes the first and second small solenoid valves 23 and 24 according to the pushing position of the control switch 30 respectively or simultaneously. That is, when the water storage unit 9 for sampling water is set on the main body 3 on the ground, the outside air is in the water storage unit 9 and the control device 27 is operated to operate the first and second small solenoid valves 23. , 24 is closed, air is confined in the water reservoir 9. When the main body 3 is suspended in the groundwater in the underground hole 4 and the control device 27 is operated and the first small solenoid valve 23 is opened, the water sampling pipe 21 communicates the water storage unit 9 with the external groundwater. It is supposed to be. Further, when the control device 27 is operated and the second small solenoid valve 24 is opened while the main body 3 is in the groundwater, the air vent pipe 25 allows the water storage section 9 to communicate with either the groundwater or the outside air, The air in the water reservoir 9 is discharged to the outside. Further, when the control device 27 is operated in a state where the water storage unit 9 is filled with water and the first and second small solenoid valves 23 and 24 are closed, the water in the water storage unit 9 collected as a water sample is collected. Is supposed to be trapped.

  That is, the water sampling apparatus 2 has a structure in which the air buoyancy and the water pressure difference are used as the driving force during water sampling. First, the main body 3 is suspended in the underground hole 4 by the rope 5 and stopped at the water sampling position. Next, when the first and second small solenoid valves 23 and 24 are opened by the operation of the control device 27, The air in the portion 9 is subjected to water pressure corresponding to the depth of the main body 3 from two directions of the water inlet / outlet 12 and the air inlet / outlet 13. Immediately after opening both the solenoid valves 23 and 24, the air pressure of the water reservoir 9 is balanced with the water pressure. Thereafter, the air in the water reservoir 9 is in the same state as the air placed in the water, and buoyancy is generated. In order to compensate for the space after the air in the water storage section 9 is released by the air in the water storage section 9 being released into the water through the air inlet / outlet port 13, the air vent pipe 25 and the backflow prevention valve 26 by this buoyancy, Groundwater is introduced through the water sampling pipe 21, the water inlet / outlet 12 and the introduction pipe 15.

  Next, the water sampling method of the present invention will be described based on the action of the water sampling apparatus 2 according to the above embodiment. First, on the ground, a predetermined type of water storage unit 9 with a predetermined amount of water sampled is set in the main body 3, and then it is confirmed that no impurities are attached inside the water storage unit 9. Thus, the first and second small solenoid valves 23 and 24 are closed, and air is confined in the water reservoir 9 (first step). Next, the main body 3 is suspended in the underground hole 4 by the rope 5 and stopped at a predetermined depth position (predetermined depth position) where water is to be sampled. The first and second small solenoid valves 23 and 24 are opened, and water is introduced into the water storage section 9 through the water sampling pipe 21 while the air inside the water storage section 9 is extracted to the outside through the air vent pipe 25 (second step). At this time, ground water to be sampled is introduced into the water storage unit 9 via the disposable filter 22 of the filter unit 7, so that the ground water from which impurities have been removed is collected as a sample for sampling. Further, since the water introduction speed can be changed depending on the distance between the upper end opening height H1 of the air vent pipe 25 and the depth position of the air inlet / outlet 13, the upper end opening height of the air vent pipe 25 can be changed according to the desired introduction speed. The height H1 is adjusted in the vertical direction. And when the water level in the water storage part 9 rises and the water level reaches the water collection confirmation electrode 14, the water collection confirmation electrode 14 sends a detection signal to the control device 27, and the control device 27 is based on this detection signal. The operation check lamp 29 is turned on, and the first and second small solenoid valves 23 and 24 are closed. Thus, when the water reservoir 9 is filled with water, the water is confined in the water reservoir 9 and the collection of the water sample is completed (third step). When the operation confirmation lamp 29 of the control device 27 is turned on, it is regarded that the water sampling is completed on the ground, and the main body 3 is pulled up by the rope 5. When the main body 3 is collected on the ground, the water reservoir 9 containing the collected water sample is removed from the main body 3 and the operation is completed (fourth step).

  As described above, in the water sampling apparatus 2 according to the present embodiment, the first and second small solenoid valves 23 and 24 are opened on the ground, the outside air is introduced into the water storage unit 9, and the small solenoid valves 23 and 24 are closed. When the main body 3 having the water storage section 9 as an air chamber is suspended in the ground water of the underground hole 4 by the rope 5 and the first and second small solenoid valves 23 and 24 are opened at a predetermined depth, Is discharged to the outside through the air vent pipe 25, and the groundwater in the underground hole 4 is introduced from the water sampling port 20 into the water storage section 9 through the water sampling pipe 21. When the water level rises in the water storage unit 9 and the water collection confirmation electrode 14 detects water, a detection signal is sent from the water collection confirmation electrode 14 to the control device 27 and the operation of the water collection confirmation electrode 14 is displayed. When the operation of the displayed water collection confirmation electrode 14 is confirmed, the control device 27 closes the first and second small solenoid valves 23 and 24 to confine water in the water storage unit 9. When water is confined in the water reservoir 9, the main body 3 is pulled up to the ground by the rope 5. For this reason, it is possible to control the depth position and timing of water sampling on the ground, and even if the depth of the underground hole 4 is deep, water can be accurately sampled without disturbing the water in the hole. it can.

  In the water sampling method using the water sampling apparatus 2 according to the present embodiment, in the first step, air is sealed in the water storage section 9 of the main body 3 to form an air chamber, and in the second step, the main body 3 is When suspended in a desired position in the underground hole 4 and water is introduced into the water storage unit 9 and the operation of the water collection confirmation electrode 14 is confirmed by the control device 27 in the third step, the control device 27 causes the first and second operations to be performed. The small solenoid valves 23 and 24 are closed to seal the water reservoir 9, and the main body 3 is recovered in the fourth step. For this reason, it is possible to control the depth position and timing of sampling on the ground, and accurately and efficiently collect water without disturbing the water in the hole even if the depth of the underground hole 4 is deep. can do.

  Based on the configuration of this example, an actual machine was manufactured and tested, and groundwater sampling with a deep groundwater level from the ground surface to about 65 m below ground and a water depth of 20 m could be realized. Further, regarding the water sampling rate, when the vertical distance h from the position of the water sampling port 20 to the upper end opening H1 of the air vent pipe 25 is, for example, h = 16 m, the water sampling rate is 1.67 ml / s, h = In the case of 20 m, the water sampling rate was found to be 1.89 ml / s.

  Next, a modification of the above embodiment will be described with reference to FIG. The water sampling apparatus 102 according to the modified example includes a water quality sonde (water quality measuring device) 130 below the main body 3, and the water sampling port 120 of the water sampling pipe 121 extends downward to the vicinity of the sensor portion 131 of the water quality sonde 130. Although different from the above embodiment, it has substantially the same configuration except this point. The water quality sonde 130 is electrically connected to a monitor device (display device) 132 installed on the ground. The water quality sonde 130 is connected to the main body 3 side by an insulating tape (not shown). The water quality sonde 130 is commercially available, and sends data such as water depth (water level), water quality (electric conductivity), temperature (water temperature) detected by the sensor unit 131 to the monitor device 132. The monitor device 132 displays various data such as water depth, water quality, and temperature sent from the water quality sonde 130 in real time through a monitor screen. For this reason, in order to suspend the main body 3 in the underground hole 4 by the rope 5 and guide it to a desired depth position, data such as the water depth, water quality, water temperature, etc. detected by the water quality sonde 130 by the monitor device 132 on the ground are collected. The main body 3 can be moved to a desired position while sequentially observing. For this reason, it can be confirmed at a glance whether or not the position of the water sampling port 120 is at a desired water depth or aquifer, an accurate water sample can be obtained, and the water sampling operation is made efficient. In the water sampling method using the water sampling apparatus 102 according to this modified example, the main body 3 is placed at a desired position while observing data such as water depth, water quality, and water temperature detected by the water quality sonde 130 by the monitor apparatus 132 on the ground. Since it can be moved, water sampling can be performed after determining the hanging position of the rope 5 based on these data. For this reason, it can be confirmed at a glance whether the position of the water sampling port 120 is at a desired water depth or aquifer, and the position of the water sampling port 120 can be quickly determined.

  In the water sampling apparatus 102 according to each of the above embodiments, the control device 27 automatically closes the first and second small solenoid valves 23 and 24 when a detection signal is sent from the water sampling confirmation electrode 14. However, the present invention is not limited to this, and when the operation confirmation lamp 29 is turned on, an operator may manually close the first and second small solenoid valves 23 and 24. In each of the above-described embodiments, the weight portion 6 is provided. However, the present invention is not limited to this, and it goes without saying that the weight of a part of the main body 3 may be increased to replace the weight portion 6. .

It is a block diagram of the water sampling apparatus which concerns on one Example of this invention. Example 1 It is a block diagram of the water sampling apparatus which concerns on the modification of FIG. (Example 2) (A), (B) is explanatory drawing which shows the state which hangs down the conventional water sampling device in an underground hole, respectively, and explanatory drawing which shows the state pulled up after water sampling. When (A) and (B) respectively limit the aquifer which becomes a water sampling object using the conventional packer, the explanatory drawing which shows the case where the water permeability of a water sampling layer is favorable, and the water permeability of a water permeable layer are It is explanatory drawing which shows the case where it is low.

Explanation of symbols

2 Water sampling device 3 Body 4 Underground hole 5 Strip (elevating means)
9 Water storage 14 Water collection confirmation electrode (sensor)
20 Sampling port 21 Sampling pipe (water sampling introduction passage)
23 First small solenoid valve (first valve)
24 Second small solenoid valve (second valve)
25 Air vent pipe (air vent passage)
27 Control device (control means)

Claims (8)

A water storage section in which a water sampling space is formed, a sensor for detecting the completion of water sampling in the water storage section, and a water sampling introduction in which a water sampling port is formed at one end and the other end communicates with the water storage section via the first valve A main body having a passage and an air vent passage whose upper end communicates with the outside air and whose lower end communicates with the water storage section via the second valve;
Elevating means is provided to hang this body up and down freely in the underground hole,
A water sampling system characterized in that control means that is electrically connected to the sensor and the first and second valves, respectively, and opens and closes the first and second valves according to the operation of the sensor is installed on the ground. apparatus.   The water sampling apparatus according to claim 1, wherein the control means is provided with a display unit that displays the presence or absence of sensor operation.   The water sampling port according to claim 1 or 2, wherein the water sampling inlet passage is provided with a filter portion between the water sampling port and the first valve, and the air vent passage is provided with a backflow prevention valve. apparatus.   The water sampling apparatus according to any one of claims 1 to 3, wherein the control means is configured to close the first and second valves based on a detection signal from the sensor.   5. A water quality measuring device is attached to the main body, and a display device that is electrically connected to the water quality measuring device and displays measurement data sent from the water quality measuring device is installed on the ground. The water sampling device of any one of these.   The water sampling apparatus according to any one of claims 1 to 5, wherein each of the first and second valves is constituted by a small electromagnetic valve. A water storage section in which a water sampling space is formed, a sensor for detecting the completion of water sampling in the water storage section, and a water sampling introduction in which a water sampling port is formed at one end and the other end communicates with the water storage section via the first valve A main body having a passage and an air vent passage whose upper end communicates with the outside air and whose lower end communicates with the water storage section via the second valve, and is provided with an elevating means for hanging the main body up and down freely in the underground hole And a control means that is installed on the ground and is electrically connected to the sensor and the first and second valves, respectively, and opens and closes the first and second valves according to the operation of the sensor. And
A first step of introducing outside air into the water reservoir of the main body and closing the first and second valves by the control means;
The main body, in which the air is confined in the water reservoir, is hung down to a desired position in the underground water in the underground hole by the elevating means, the first and second valves are opened by the control means, and the air in the water reservoir is discharged to the outside. A second step of introducing water into the reservoir;
A third step that considers the completion of water sampling in the water reservoir by the operation of the sensor, closes the first and second valves by the control means, and closes water in the water reservoir;
And a fourth step of collecting the main body, in which water is confined in the water storage part, by lifting it to the ground by means of lifting means.   A water quality measuring instrument is attached to the main body, and a display device that is electrically connected to the water quality measuring instrument and displays measurement data sent from the water quality measuring instrument is installed on the ground. Based on the data displayed on the display device The water sampling method according to claim 7, wherein water sampling is performed after determining the hanging position of the lifting means.

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