JP6901769B2 - Groundwater sampling device and groundwater sampling method - Google Patents

Description

The present invention relates to a groundwater sampling device and a groundwater sampling method.

As a groundwater sampling device, Patent Document 1 discloses a continuous groundwater sampling device, and Patent Document 2 discloses a packer-type groundwater sampling device.
In the groundwater continuous water sampler of Patent Document 1, the first pipe serves as a vacuum sample water sampling bottle container, and the groundwater continuous water sampler is internally inserted and fixed in the second pipe. The second pipe is connected to two cylinders, and the forward and backward movements of the second cylinder raise and lower the first pipe in the vertical direction, and the forward and backward movements of the first cylinder cause the piston of the first cylinder. The syringe needle attached to the end portion serves to penetrate or separate the rubber stopper of the vacuum sample water sampling bottle at the lowermost end portion of the first tube. When the 2nd cylinder and the 1st cylinder move forward continuously, the groundwater sample is injected into the vacuum sample water sampling bottle, and when the 1st cylinder and the 2nd cylinder move backward continuously, the vacuum sample water sampling bottle whose injection is completed is driven by gravity. It separates downward from the first pipe.

The packer-type groundwater sampling device of Patent Document 2 is held in a pipe with an open lower end that is driven by an elevator to move up and down in a pipe inserted into the boring hole, and the lower end side is sealed with an elastic member to maintain a vacuum state. The water sampling container, both ends injection needles whose one end faces the elastic member of the water sampling container and is held by a slidable holding member in the pipe with the lower end open, and the tip of the pipe inserted into the boring hole. Two packers, which are installed facing each other vertically at predetermined intervals via a strainer and expand by pumping inert pressure gas to form a closed space in the boring hole and divide the water sampling section, and both. A groundwater holding member arranged in a closed space formed by a packer, the upper end facing the other end of the needles at both ends is sealed by an elastic member, and the groundwater introduced through a filter facing the strainer is sealed and held. To be equipped. Then, by lowering the pipe with the lower end open by the elevator, the elastic member of the water sampling container and the groundwater holding member is inserted by the injection needles at both ends, and the groundwater in the groundwater holding member is collected into the water sampling container.

Japanese Unexamined Patent Publication No. 2011-11190 Jitsufuku No. 6-17911

However, the groundwater continuous water sampling device described in Patent Document 1 has a complicated device configuration because it uses two cylinders, and the packer type groundwater sampling device described in Patent Document 2 is an elevator arranged on the ground at the lower end. Since the open pipe is raised and lowered, it becomes difficult to miniaturize the device.

An object of the present invention is to provide a groundwater sampling device and a groundwater sampling method capable of collecting groundwater with a simple configuration.

(1) The groundwater sampling device according to the present invention has a water sampling pipe having one open end, the open end being closed with a plug, and the pressure inside being lower than the atmospheric pressure.
A water pipe holding portion that holds at least a part of the water pipe except for the open end, and a water pipe holding portion.
A driving means for driving the water pipe holding portion in the vertical direction and
An injection needle and a water collecting part having a water collecting body connected to the injection needle,
A housing that internally houses the water collecting pipe holding portion that holds the water sampling pipe, the driving means, and the water collecting portion excluding the water collecting body.
With
A groundwater sampling device that lowers the water sampling pipe holding portion that holds the water sampling pipe by the driving means to allow the injection needle to penetrate the plug and collect the groundwater flowing from the water collecting body into the water sampling pipe. Is.

(2) In the groundwater sampling device of the above (1), the water sampling pipe holding portion has a cylindrical shape with one end opened, and the water sampling pipe is fitted and held inside the cylindrical water sampling pipe holding portion. You may do so.

(3) In the groundwater sampling device according to (1) or (2), the driving means may be a cylinder, and the piston rod of the cylinder may be joined to the upper part of the water sampling pipe holding portion.

(4) In the groundwater sampling device according to any one of (1) to (3) above, a light emitting element and a light receiving element facing each other are arranged on the side surface of the water sampling pipe holding portion, and the sampling is performed inside the water sampling pipe holding portion. When the water pipe is inserted, the light receiving element may detect the groundwater sampling in the water sampling pipe by detecting the transmitted light from the water sampling pipe.

(5) In any of the groundwater sampling devices (1) to (3) above, adjacent light emitting elements and light receiving elements are arranged on the upper surface of the water sampling pipe holding portion, and the sampling is performed inside the water sampling pipe holding portion. When the water pipe is inserted, the light receiving element may detect the groundwater sampling in the water sampling pipe by detecting the reflected light from the upper surface of the groundwater in the water sampling pipe.

(6) The groundwater sampling method according to the present invention has a water sampling pipe having one open end, the open end being closed with a plug, and the inside having a pressure lower than the atmospheric pressure, and the water sampling pipe. A water collecting pipe holding portion that holds at least a part excluding the opening end, a driving means for driving the water sampling pipe holding portion in the vertical direction, and a water collecting portion having an injection needle and a water collecting body connected to the injection needle. A groundwater sampling device including the water sampling pipe holding portion holding the water sampling pipe, the driving means, and a housing for accommodating the water collecting portion excluding the water collecting body is arranged at the groundwater sampling position. ,
Controlled from the ground by the driving means, the water sampling pipe holding portion holding the water sampling pipe is lowered by the driving means to allow the injection needle to penetrate the plug, and the groundwater flowing from the water collector is collected. This is a groundwater sampling method that collects water in a water pipe.

According to the present invention, it is possible to obtain a groundwater sampling device and a groundwater sampling method capable of collecting groundwater with a simple configuration.

It is sectional drawing which shows the structure of the groundwater sampling apparatus of 1st Embodiment of this invention. It is sectional drawing which shows the state which the piston rod of the air cylinder of the groundwater sampling apparatus of 1st Embodiment of this invention extends downward. It is a partially enlarged view which shows the operation of the light emitting element and the light receiving element in the state where the groundwater of the groundwater sampling apparatus of this embodiment is not sampled. It is a partially enlarged view which shows the operation of the light emitting element and the light receiving element in the state where the groundwater of the groundwater sampling apparatus of this embodiment is sampled. It is a partially enlarged view which shows the operation of the light emitting element and the light receiving element in the state where the groundwater of the groundwater sampling apparatus of the modification of this embodiment is not sampled. It is a partially enlarged view which shows the operation of the light emitting element and the light receiving element in the state which the groundwater of the groundwater sampling apparatus of the modification of this embodiment is sampled. It is explanatory drawing which shows the structure of the groundwater sampling system.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First Embodiment)
FIG. 1 is a cross-sectional view showing the configuration of the groundwater sampling device according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state in which the piston rod of the air cylinder of the groundwater sampling device according to the first embodiment of the present invention extends downward.
The groundwater sampling device 10 of the present embodiment is held by an air cylinder 11 serving as a driving means, a water pipe holding portion 14 that rises and falls by the air cylinder 11, and a water sampling pipe holding portion 14, and rises and falls together with the water sampling pipe holding portion 14. A water sampling pipe 15 and an injection needle fixing portion 17 for fixing the injection needle 18 are provided.

The injection needle 18 is connected to a rod-shaped water collecting body 19 via a conduction tube, and the injection needle fixing portion 17, the injection needle 18, the conduction tube, and the water collecting body 19 constitute a water collecting part. The water collector 19 is arranged outside the injection needle fixing portion 17. The lower end of the water sampling pipe 15 is opened to be an open end, and the open end can be closed with a rubber stopper 16. The pressure inside the water sampling pipe 15 closed by the rubber stopper 16 is lower than the atmospheric pressure (decompression or vacuum state). The injection needle fixing portion 17 can insert the lower end of the water sampling pipe 15 including the rubber stopper 16 into the inside. The water sampling pipe 15 is removable from the water sampling pipe holding portion 14.

The water pipe holding portion 14 holds at least a part of the water pipe 15 except the open end. For example, the water sampling pipe holding portion 14 has a cylindrical shape with one end opened, and a part of the water sampling pipe 15 is fitted and held inside the cylindrical water sampling pipe holding portion 14. When the material of the water sampling pipe holding portion 14 is metal, a rubber sheet or the like can be attached to the inner peripheral wall of the water sampling pipe holding portion 14 and the water sampling pipe 15 can be inserted to hold the water sampling pipe 15. The outer circumference of the water sampling pipe may be wrapped with tape, and the water sampling pipe 15 may be inserted into the water sampling pipe holding portion 14 to hold the water sampling pipe 15. When the water sampling pipe holding portion 14 is made of plastic, the water sampling pipe 15 may be inserted as it is to hold the water sampling pipe 15.

The water collector 19 is not particularly limited as long as it does not contain sand or the like and groundwater can flow into it, and a porous body, a tubular body having a plurality of openings, or the like can be used.

Further, the groundwater sampling device 10 is a second housing portion into which the first housing portion 20-1 for fixing the air cylinder 11, the water sampling pipe holding portion 14 for holding the water sampling pipe 15, and the injection needle fixing portion 17 can be inserted. 20-2, a lid portion 21-1 that closes the upper opening end of the first housing portion 20-1, and a lid portion 21-2 that closes the lower opening end of the second housing portion 20-2 are provided. The injection needle fixing portion 17 is fixed to the inside of the lid portion 21-2. The connection portion of the pipe 22 is fixed to the lid portion 21-1. The pipe 22 is a pipe through which the air pipes 13-1 and 13-2 pass.
The first housing portion 20-1, the second housing portion 20-2, the lid portion 21-1, and the lid portion 21-2 constitute a housing. It is desirable to have a configuration that prevents groundwater from entering the housing.

A female thread is cut on the inner connection portion of the end portion of the first housing portion 20-1, and a male screw is cut on the outer connection portion of the second housing portion 20-2. 20-1 and the second housing portion 20-2 can be connected. The air cylinder 11 is fixed to the air cylinder fixing portion 20-1a of the first housing portion 20-1. The air cylinder 11 is connected to the air pipe 13-1 via the air adapter 12-1, and is connected to the air pipe 13-2 via the air adapter 12-2. The piston rod of the air cylinder 11 can be raised and lowered (driven in the vertical direction) from the surface of the air cylinder fixing portion 20-1a opposite to the fixed surface of the air cylinder 11. The upper part of the water sampling pipe holding portion 14 is joined to the piston rod, and the water sampling pipe holding portion 14 rises and falls as the piston rod rises and falls. Here, the water sampling pipe holding portion 14 has a configuration in which a cylinder is connected to the upper disk-shaped piston rod joint portion, but the water sampling pipe holding portion 14 is paired as a cylindrical body with one end closed. May be good.

Next, the operation of collecting the groundwater in the observation well with the groundwater sampling device 10 will be described.
On the ground, in a state where the first housing portion 20-1 and the second housing portion 20-2 are separated, a water sampling pipe 15 whose opening end is closed with a rubber stopper 16 is provided in the water sampling pipe holding portion 14. , Insert the rubber stopper 16 so that it faces downward. The inside of the water sampling pipe 15 closed with the rubber stopper 16 is in a reduced pressure or vacuum state. After that, when the first housing portion 20-1 and the second housing portion 20-2 are combined, the state of the groundwater sampling device 10 as shown in FIG. 1 is obtained. The rubber stopper 16 of the water sampling pipe 15 is fixed at a position separated from the injection needle 18 by a certain distance.

Next, the groundwater sampling device 10 is lowered to the sampling position of the observation well and stopped at the sampling position.
High-pressure air is sent from the ground through the air pipe 13-1, and air is discharged through the air pipe 13-2. Then, as shown in FIG. 2, the piston rod of the air cylinder 11 extends downward, the water sampling pipe 15 whose opening end is closed by the rubber stopper 16 descends, and the injection needle 18 penetrates the rubber stopper 16. To do.
Since the water sampling pipe 15 is in a reduced pressure or vacuum state, groundwater is sampled into the water sampling pipe 15 via the water collector 19, the conduction pipe, and the injection needle 18.

After a certain period of time has passed and the groundwater is sufficiently sampled in the water sampling pipe 15, high-pressure air is sent from the ground through the air pipe 13-2 and the air is discharged through the air pipe 13-1. .. Then, the piston rod of the air cylinder 11 rises and returns to the original position, the water sampling pipe 15 whose opening end is closed with the rubber stopper 16 rises, and the injection needle 18 is pulled out from the rubber stopper 16.
The groundwater sampling device 10 is raised to the ground, the first housing portion 20-1 and the second housing portion 20-2 are separated on the ground, and the water sampling pipe 15 from which the groundwater is sampled from the water sampling pipe holding portion 14 Take out. In this way, water is sampled. As described above, in the present embodiment, after the injection needle 18 is pulled out from the rubber stopper 16 of the water sampling pipe 15, the groundwater inside the water sampling pipe 15 can be taken out to the ground without touching the air. Then, the official analysis can be performed without taking out the groundwater from the taken out water sampling pipe 15.

(Second embodiment)
In the first embodiment, it was determined that sufficient groundwater was sampled in the water sampling pipe 15 when a certain period of time had elapsed after the injection needle 18 penetrated the rubber stopper 16.
Since there are variations in the time for sufficiently sampling groundwater in the water sampling pipe 15, it is desirable that there is a means for determining whether or not sufficient groundwater has been sampled in the water sampling pipe 15.
FIG. 3 is a partially enlarged view showing the operation of the light emitting element and the light receiving element in a state where the groundwater of the groundwater sampling device of the present embodiment is not sampled. FIG. 4 is a partially enlarged view showing the operation of the light emitting element and the light receiving element in a state where the groundwater of the groundwater sampling device of the present embodiment is sampled. The configuration of the present embodiment is the same as the configuration of the groundwater sampling device 10 shown in FIGS. 1 and 2 except for the configuration of the water sampling pipe holding portion.

As shown in FIGS. 3 and 4, the water sampling pipe holding portion 14A of the groundwater sampling device of the present embodiment is the light emitting element 23 at the lower limit position of the water sampling amount when the water sampling pipe 15 is inserted into the water sampling pipe holding portion 14A. The light emitting element 23 and the light receiving element 24 are arranged on the side surface of the water sampling pipe holding portion 14A so that the light receiving element 24 and the light receiving element 24 face each other.

As shown in FIG. 3, when groundwater is not sampled, the light from the light emitting element 23 enters the light receiving element 24 as transmitted light through the water sampling pipe 15. On the other hand, as shown in FIG. 4, when groundwater is sampled and the groundwater exceeds the lower limit of the sampling amount, the light from the light emitting element 23 is attenuated in the water sampling pipe 15 to the light receiving element 24. Incident. Therefore, by detecting the change in the output value (transmitted light) of the light receiving element 24, it is possible to detect whether or not the amount of water sampled exceeds the lower limit value. The current source of the current supplied to the light emitting element 23 and the light receiving element 24 and the detector for detecting the change in the output value from the light receiving element 24 can be arranged in the first housing portion 20-1, and the current source and the light receiving element 24 can be arranged. Wiring for connecting the detector, the light emitting element 23 and the light receiving element 24 can be performed by opening the air cylinder fixing portion 20-1a. The signal from the detector can be detected on the ground by passing the wiring through the pipe 22.

When it is confirmed that sufficient groundwater has been sampled into the water sampling pipe 15 on the ground, high-pressure air is sent through the air pipe 13-2 and the air is discharged through the air pipe 13-1. Then, the piston rod of the air cylinder 11 rises and returns to the original position, the water sampling pipe 15 whose opening end is closed with the rubber stopper 16 rises, and the injection needle 18 is pulled out from the rubber stopper 16.
The groundwater sampling device 10 is raised to the ground, the first housing portion 20-1 and the second housing portion 20-2 are separated on the ground, and the water sampling pipe 15 from which the groundwater is sampled from the water sampling pipe holding portion 14 Take out. In this way, water is sampled. As described above, in the present embodiment, after the injection needle 18 is pulled out from the rubber stopper 16 of the water sampling pipe 15, the groundwater inside the water sampling pipe 15 can be taken out to the ground without touching the air. Then, the official analysis can be performed without taking out the groundwater from the taken out water sampling pipe 15.

<Modification example>
In the groundwater sampling device described with reference to FIGS. 3 and 4, the amount of permeation in the water sampling pipe 15 was detected, but the amount of reflection may be detected.

FIG. 5 is a partially enlarged view showing the operation of the light emitting element and the light receiving element in a state where the groundwater of the groundwater sampling device of the modified example of the present embodiment is not sampled. FIG. 6 is a partially enlarged view showing the operation of the light emitting element and the light receiving element in a state where the groundwater of the groundwater sampling device of the modified example of the present embodiment is sampled. The configuration of the present embodiment is the same as the configuration of the groundwater sampling device 10 shown in FIGS. 1 and 2 except for the configuration of the water sampling pipe holding portion.
As shown in FIGS. 5 and 6, when the water sampling pipe holding portion 14B of the groundwater sampling device of this modified example exceeds the lower limit of the water sampling amount when the water sampling pipe 15 is inserted into the water sampling pipe holding portion 14B, The light emitting element 23 and the light receiving element 24 are arranged on the upper surface of the water sampling pipe holding portion 14B so that the light from the light emitting element 23 is reflected on the surface of the groundwater collected and incident on the light receiving element 24.

As shown in FIG. 5, when the groundwater is not sampled, the light from the light emitting element 23 travels downward in the water sampling pipe 15. On the other hand, as shown in FIG. 6, when the groundwater is sampled and the groundwater exceeds the lower limit of the sampling amount, the light from the light emitting element 23 is reflected by the surface of the groundwater in the water sampling pipe 15 and is reflected by the light receiving element. It is incident on 24. Therefore, by detecting the change in the output value (reflected light) of the light receiving element 24, it is possible to detect whether or not the amount of water sampled exceeds the lower limit value.

The groundwater sampling device of the first and second embodiments has been described above. Next, a groundwater sampling system using the groundwater sampling device of the first or second embodiment will be described. In the following description, the case will be described using the groundwater sampling device 10 of the first embodiment, but it goes without saying that the groundwater sampling device of the second embodiment may be used.
FIG. 7 is an explanatory diagram showing the configuration of the groundwater sampling system. The groundwater sampling system includes the groundwater sampling device 10 of the first embodiment, a switching valve 30, and an air compressor 40. The groundwater sampling device 10 and the switching valve 30 are connected by a pipe 22. High-pressure air is sent from the air compressor 40 to the switching valve 30.

When water is sampled into the water sampling pipe 15, high-pressure air is sent through the air pipe 13-1 by the switching valve 30, and air is discharged through the air pipe 13-1. Then, the piston rod of the air cylinder 11 extends downward, the water sampling pipe 15 whose end is closed with the rubber stopper 16 descends, the injection needle 18 penetrates the rubber stopper 16, and water is collected. It is said. On the other hand, when the water sampling to the water sampling pipe 15 is completed, the switching valve 30 is switched to send high-pressure air through the air pipe 13-2 and discharge the air through the air pipe 13-3. Then, the piston rod of the air cylinder 11 rises and returns to the original position, the water sampling pipe 15 whose opening end is closed with the rubber stopper 16 rises, and the injection needle 18 is pulled out from the rubber stopper 16.

The groundwater sampling device and the groundwater sampling system of the first or second embodiment are not particularly limited in use, but can be suitably used for sampling contaminated groundwater. In addition, the guideline (revised second edition) on investigation and measures based on the Soil Contamination Countermeasures Law was announced in August 2012 by the Ministry of the Environment, the Water and Air Environment Bureau, and the Soil Environment Division, and Appendix 7_4 of the guideline As a water sampling method, a method using a water sampler is mentioned. In this method using a water sampler, the groundwater sampling device and the groundwater sampling system of the present embodiment can be preferably used.

10 Groundwater sampling device 11 Air cylinder 12-1, 12-2 Air adapter 13-1, 13-2 Air piping 14, 14A, 14B Water sampling pipe holding part 15 Water sampling pipe 16 Rubber stopper 17 Injection needle fixing part 18 Injection needle 19 collection Water body 20-1 1st housing 20-2 2nd housing 21-1, 21-2 Lid 22 Piping

Claims (6)

A water pipe having one open end, the open end being closed with a plug, and the pressure inside being lower than atmospheric pressure.
A water pipe holding portion that holds at least a part of the water pipe except for the open end, and a water pipe holding portion.
A driving means for driving the water pipe holding portion in the vertical direction and
An injection needle and a water collecting part having a water collecting body connected to the injection needle,
A housing that internally houses the water collecting pipe holding portion that holds the water sampling pipe, the driving means, and the water collecting portion excluding the water collecting body.
With
A groundwater sampling device that lowers the water sampling pipe holding portion that holds the water sampling pipe by the driving means to allow the injection needle to penetrate the plug and collect the groundwater flowing from the water collecting body into the water sampling pipe. .. The groundwater sampling device according to claim 1, wherein the water sampling pipe holding portion has a cylindrical shape with one end opened, and the water sampling pipe is fitted and held inside the cylindrical water sampling pipe holding portion. The groundwater sampling device according to claim 1 or 2, wherein the driving means is a cylinder, and the piston rod of the cylinder is joined to the upper part of the water sampling pipe holding portion. A light emitting element and a light receiving element facing each other are arranged on the side surface of the water sampling pipe holding portion, and when the water sampling pipe is inserted inside the water sampling pipe holding portion, the light receiving element transmits the transmitted light from the water sampling pipe. The groundwater sampling device according to any one of claims 1 to 3, which detects the sampling of groundwater in the water sampling pipe by detecting the groundwater. Adjacent light emitting elements and light receiving elements are arranged on the upper surface of the water sampling pipe holding portion, and when the water sampling pipe is inserted inside the water sampling pipe holding portion, the light receiving element is placed on the upper surface of the groundwater in the water sampling pipe. The groundwater sampling device according to any one of claims 1 to 3, wherein the groundwater sampling in the water sampling pipe is detected by detecting the reflected light from the water sampling pipe. A water pipe that has one open end, the open end is closed with a plug, and the pressure inside is lower than atmospheric pressure, and a water pipe that holds at least a part of the water pipe except for the open end. A water collecting unit having a holding portion, a driving means for driving the water sampling pipe holding portion in the vertical direction, an injection needle and a water collecting body connected to the injection needle, and the water sampling pipe holding portion holding the water sampling pipe. A groundwater sampling device including the driving means and a housing for accommodating the catchment portion excluding the catchment body is arranged at the groundwater sampling position.
Controlled from the ground by the driving means, the water sampling pipe holding portion holding the water sampling pipe is lowered by the driving means to allow the injection needle to penetrate the plug, and the groundwater flowing from the water collector is collected. Groundwater sampling method that collects water in a water pipe.

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