JP2019060102A - Groundwater collecting device and groundwater collecting method - Google Patents

Abstract

To provide a groundwater collecting device capable of collecting groundwater with a simple configuration.SOLUTION: A groundwater collecting device comprises: a water collecting pipe having one open end, the open end closed by a plug and the inside being at a pressure lower than atmospheric pressure; a water collecting pipe holding portion for holding at least a part, except the open end, of the water collecting pipe; driving means for driving the water collecting pipe holding portion in the vertical direction; a water catchment portion having a syringe needle and a water catchment body connected to the syringe needle; and a housing for internally accommodating the water collecting pipe holding portion holding the water collecting pipe, the drive means, and the water catchment portion excluding the water catchment body. The syringe needle is made to penetrate the plug by lowering the water collecting pipe holding portion holding the water collecting pipe by the driving means, so that a groundwater flowing from the water catchment body is collected in the water collecting pipe.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a groundwater collecting apparatus and a groundwater collecting method.

As a groundwater collecting device, Patent Document 1 discloses a continuous groundwater collecting device, and Patent Document 2 discloses a packer type groundwater collecting device.
In the groundwater continuous water collector of Patent Document 1, the first pipe serves as a vacuum sample water collecting bottle container and is fixed by being inserted into the second pipe. The second pipe is connected to the two cylinders, and vertically moved up and down around the first pipe by advancing and retracting the second cylinder, and further advancing and retreating the first cylinder to move the first cylinder piston It serves to pierce and separate the syringe needle attached to the end through the rubber plug of the vacuum sample collecting bottle at the lower end of the first tube. When the second cylinder and the first cylinder move forward continuously, the ground water sample is injected into the vacuum sample collecting bottle, and when the first cylinder and the second cylinder move back continuously, the injected vacuum sample collecting bottle is under gravity Detaches downward from the first pipe.

  The packer type groundwater collecting apparatus of Patent Document 2 is held in a pipe opened at the lower end which is driven by an elevator to move up and down in a pipe inserted into a borehole and the lower end side is sealed by an elastic member and maintained in vacuum. A water sampling container, a double-ended injection needle held by a holding member having one end opposed to an elastic member of the water sampling container and slidable in the lower end open pipe, and a tip of a pipe inserted into the boring hole The two packers are installed facing each other up and down at a predetermined interval via a strainer, and expanded by pumping inert pressure gas to form a sealed space in the borehole to divide the water collection section, It is disposed in a sealed space formed by the packer, and the upper end opposite to the other end of the both-ends needle is sealed by an elastic member to seal and hold underground water introduced through a filter facing the strainer. Comprising a sewage holding member. And the elastic member of the water collection container and the groundwater holding member is inserted by the double-end injection needle by lowering the lower end open pipe by an elevator, and the groundwater in the groundwater holding member is collected into the water collection container.

JP, 2011-111890, A Japanese Utility Model Publication No. 6-19171

  However, the groundwater continuous water collector described in Patent Document 1 has a complicated apparatus configuration because it uses two cylinders, and the packer type groundwater collecting apparatus described in Patent Document 2 is an elevator installed on the ground at the lower end. The open tube is raised and lowered, which makes it difficult to miniaturize the device.

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

(1) A water sampling pipe according to the present invention has one open end, the open end is closed by a plug, and the inside is a pressure lower than atmospheric pressure,
A water collecting pipe holding portion for holding at least a part of the water collecting pipe excluding the open end;
Drive means for driving the water collecting pipe holder in the vertical direction;
An injection needle and a water collection unit having a water collection body connected to the injection needle;
The water collection pipe holding part holding the water collection pipe, the drive means, and a case that accommodates the water collection part excluding the water collection body inside;
Equipped with
A groundwater collecting apparatus, wherein the injection needle is made to penetrate the plug by lowering the water collecting pipe holding portion holding the water collecting pipe by the driving means, and the groundwater flowing from the water collecting body is collected in the water collecting pipe It is.

  (2) In the groundwater collecting apparatus according to the above (1), the water collecting pipe holding portion has a cylindrical shape with one end opened, and the water collecting pipe is fitted and held in the cylindrical water collecting pipe holding portion. You may

  (3) In the groundwater collecting apparatus of the above (1) or (2), the driving means may be a cylinder, and a piston rod of the cylinder may be joined to an upper portion of the water collecting pipe holding portion.

  (4) In the groundwater collecting apparatus according to any one of the above (1) to (3), the light emitting element and the light receiving element opposed to each other are disposed on the side surface of the water collecting pipe holding part. When the water pipe is inserted, the light receiving element may detect the transmitted light from the water collection pipe to detect the water collection of the ground water in the water collection pipe.

  (5) In the groundwater collecting apparatus according to any one of the above (1) to (3), the light emitting element and the light receiving element adjacent to each other are disposed on the upper surface of the water collecting pipe holding part. When the water pipe is inserted, the light receiving element may detect reflected light from the upper surface of the ground water in the water collection pipe to detect the water collection of the ground water in the water collection pipe.

(6) The groundwater collecting method according to the present invention has a single open end, the open end is closed by a plug, and the inside of the water collection pipe has a pressure lower than atmospheric pressure, and the above-mentioned water collection pipe A water collecting part having a water collecting pipe holding part for holding at least a part except the open end, a driving means for driving the water collecting pipe holding part in the vertical direction, a syringe needle and a water collecting body connected to the syringe needle A groundwater collection device including the water collection tube holding part holding the water collection tube, the drive means, and a case for accommodating the water collection part excluding the water collection body at a groundwater collection position; ,
The injection needle is made to penetrate the plug by lowering the water collection tube holding part holding the water collection tube by the drive means controlled from the ground by the drive means, and the underground water flowing in from the water collection body is collected It is a groundwater collection method to collect water in the water pipe.

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

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the structure of the groundwater collecting apparatus of the 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 extended downward. It is a partially enlarged view showing the operation of the light emitting element and the light receiving element in a state where the groundwater is not collected in the groundwater collecting device of the present embodiment. It is a partially enlarged view showing the operation of the light emitting element and the light receiving element in a state in which the groundwater of the groundwater collecting apparatus of the present embodiment is collected. It is a partially enlarged view showing the operation of the light emitting element and the light receiving element in a state where the groundwater is not collected in the groundwater collecting apparatus of the modification of the embodiment. It is a partially enlarged view showing the operation of the light emitting element and the light receiving element in a state in which the groundwater of the groundwater collecting apparatus of the modification of the present embodiment is collected. It is an explanatory view showing the composition of a groundwater extraction 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 a groundwater collecting apparatus according to a 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 apparatus of the first embodiment of the present invention extends downward.
The groundwater collecting apparatus 10 according to the present embodiment is held by the air cylinder 11 serving as a driving unit, the water collecting pipe holding unit 14 raised and lowered by the air cylinder 11, and the water collecting pipe holding unit 14. And a needle fixing portion 17 for fixing the needle 18.

  The injection needle 18 is connected to the rod-like water collection body 19 via the conduction pipe, and the injection needle fixing portion 17, the injection needle 18, the conduction pipe, and the water collection body 19 constitute a water collection part. The water collector 19 is disposed outside the injection needle fixing portion 17. The lower end portion of the water sampling pipe 15 is opened to be an open end, and the open end can be closed with a rubber plug 16. The inside of the water sampling pipe 15 closed by the rubber plug 16 is at a pressure (reduced pressure or vacuum) lower than the atmospheric pressure. The injection needle fixing portion 17 can insert the lower end of the water sampling tube 15 including the rubber plug 16 into the inside. The water sampling pipe 15 is attachable to and detachable from the water sampling pipe holder 14.

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

  The water collecting body 19 is not particularly limited as long as sand or the like does not mix and groundwater can flow in, and a porous body, a cylindrical body having a plurality of openings, and the like can be used.

In addition, the groundwater collecting apparatus 10 has a first case unit 20-1 for fixing the air cylinder 11, a second case unit capable of inserting the water sampling tube holding unit 14 holding the water collection tube 15, and the injection needle fixing unit 17 20-2, a cover 21-1 for closing the upper opening end of the first housing 20-1 and a cover 21-2 for closing the lower opening end of the second housing 20-2. The injection needle fixing portion 17 is fixed to the inside of the lid portion 21-2. The connection part of the piping 22 is fixed to the cover part 21-1. The pipe 22 is a pipe through which the air pipes 13-1 and 13-2 pass.
The first casing 20-1, the second casing 20-2, the lid 21-1, and the lid 21-2 constitute a casing. It is desirable that the housing should be free of groundwater.

  An internal connection portion at the end of the first housing portion 20-1 is internally threaded, and an external connection portion of the second housing portion 20-2 is externally threaded, and the first housing portion 20-1 and the second housing unit 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 an air pipe 13-1 via an air adapter 12-1, and connected to an air pipe 13-2 via an air adapter 12-2. The piston rod of the air cylinder 11 is capable of moving up and down (drivable in the vertical direction) from the surface of the air cylinder fixing portion 20-1a opposite to the fixing surface of the air cylinder 11. The upper portion of the water sampling tube holding portion 14 is joined to the piston rod, and the water sampling tube holding portion 14 ascends and descends as the piston rod moves up and down. Here, the water sampling tube holding portion 14 is configured such that the cylinder is connected to the upper disk-shaped piston rod joint portion, but the water sampling tube holding portion 14 is a pair and is one end closed cylindrical body It is also good.

Next, an operation of collecting groundwater in the observation well by the groundwater collecting apparatus 10 will be described.
With the first casing 20-1 and the second casing 20-2 separated from each other on the ground, the water collection tube 15 whose opening end is closed by the rubber plug 16 is provided in the water collection tube holder 14 , The rubber plug 16 is inserted so as to face downward. The inside of the water sampling pipe 15 closed by the rubber plug 16 is under reduced pressure or vacuum. Thereafter, when the first casing 20-1 and the second casing 20-2 are combined, the state of the groundwater collecting apparatus 10 as shown in FIG. 1 is obtained. The rubber plug 16 of the water sampling tube 15 is fixed at a position separated from the injection needle 18 by a fixed distance.

Next, the groundwater collecting device 10 is lowered to the water collecting position of the observation well and stopped at the water collecting position.
From the ground, high pressure air is sent through the air pipe 13-1, and the 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 collection pipe 15 whose open end is closed by the rubber plug 16 descends, and the injection needle 18 penetrates the rubber plug 16 Do.
Since the water collection pipe 15 is under reduced pressure or vacuum, ground water is collected into the water collection pipe 15 via the water collecting body 19, the conduction pipe, and the injection needle 18.

After a predetermined time has passed, ground water is sufficiently collected in the water collection pipe 15, and then high pressure air is sent from the ground via the air piping 13-2 and the air is discharged via the air piping 13-1. . Then, the piston rod of the air cylinder 11 ascends and returns to the original position, the water collection pipe 15 whose open end is closed by the rubber plug 16 ascends, and the injection needle 18 is pulled out of the rubber plug 16.
The groundwater collecting device 10 is raised to the ground, and the first housing 20-1 and the second housing 20-2 are separated on the ground, and the water collecting pipe 15 from which the groundwater is collected from the water collecting pipe holder 14 Take out. Thus, water sampling is performed. As described above, in the present embodiment, after the injection needle 18 is pulled out of the rubber plug 16 of the water collection tube 15, the groundwater in the water collection tube 15 can be taken out to the ground without touching the air. And official analysis can be performed without taking out underground water from the water sampling pipe 15 taken out.

Second Embodiment
In the first embodiment, it was determined that ground water was sufficiently collected in the water collection pipe 15 when a predetermined time passed after the injection needle 18 penetrated the rubber plug 16.
Since there is a variation in the time for sufficiently collecting groundwater in the water collection pipe 15, it is desirable that there is a means by which it can be determined whether the groundwater can be sufficiently collected in the water collection 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 groundwater is not collected in the groundwater collecting apparatus of the present embodiment. FIG. 4 is a partially enlarged view showing the operation of the light emitting element and the light receiving element in a state in which the groundwater of the groundwater collecting apparatus of this embodiment is collected. The configuration of the present embodiment is the same as the configuration of the groundwater collecting apparatus 10 shown in FIG. 1 and FIG. 2 except for the configuration of the water collecting pipe holding portion.

  As shown in FIG. 3 and FIG. 4, when the water collecting pipe 15 is inserted into the water collecting pipe holding part 14A, the water collecting pipe holding part 14A of the groundwater collecting apparatus of this embodiment is a light emitting element 23 at the lower limit position of the water collecting amount. The light emitting element 23 and the light receiving element 24 are disposed on the side surface of the water sampling tube holding portion 14A such that the light receiving element 24 and the light receiving element 24 face each other.

  As shown in FIG. 3, in a state where groundwater is not collected, light from the light emitting element 23 passes through the water collecting pipe 15 and enters the light receiving element 24 as transmitted light. On the other hand, as shown in FIG. 4, when groundwater is collected and the groundwater exceeds the lower limit position of the amount of water collection, the amount of light from the light emitting element 23 is attenuated in the water collecting tube 15 and the light receiving element 24 is It will be incident. Therefore, by detecting a change in the output value (transmitted light) of the light receiving element 24, it is possible to detect whether the water collection amount has exceeded 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 a change in the output value from the light receiving element 24 can be disposed in the first housing 20-1, and Wiring for connecting the detector to 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 into the pipe 22.

If ground water can be sufficiently collected in the water collection pipe 15 on the ground, high-pressure air is sent through the air piping 13-2 and the air is discharged through the air piping 13-1. Then, the piston rod of the air cylinder 11 ascends and returns to the original position, the water collection pipe 15 whose open end is closed by the rubber plug 16 ascends, and the injection needle 18 is pulled out of the rubber plug 16.
The groundwater collecting device 10 is raised to the ground, and the first housing 20-1 and the second housing 20-2 are separated on the ground, and the water collecting pipe 15 from which the groundwater is collected from the water collecting pipe holder 14 Take out. Thus, water sampling is performed. As described above, in the present embodiment, after the injection needle 18 is pulled out of the rubber plug 16 of the water collection tube 15, the groundwater in the water collection tube 15 can be taken out to the ground without touching the air. And official analysis can be performed without taking out underground water from the water sampling pipe 15 taken out.

<Modification>
In the groundwater collecting apparatus described with reference to FIGS. 3 and 4, the amount of permeation in the water collecting pipe 15 is 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 groundwater is not collected in the groundwater collecting apparatus of the modification of the embodiment. FIG. 6 is a partially enlarged view showing the operation of the light emitting element and the light receiving element in a state where groundwater is collected in the groundwater collecting apparatus of the modification of the embodiment. The configuration of the present embodiment is the same as the configuration of the groundwater collecting apparatus 10 shown in FIG. 1 and FIG. 2 except for the configuration of the water collecting pipe holding portion.
As shown in FIG. 5 and FIG. 6, when the water collection pipe holding part 14B of the groundwater collecting apparatus of this modification inserts the water collection pipe 15 into the water collection pipe holding part 14B, when the lower limit of the water collection amount is exceeded, The light emitting element 23 and the light receiving element 24 are disposed on the upper surface in the water sampling tube holding portion 14B so that the light from the light emitting element 23 is reflected by the surface of the collected groundwater and enters the light receiving element 24.

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

As mentioned above, although the groundwater extraction apparatus of 1st and 2nd embodiment was demonstrated, the groundwater extraction system using the groundwater extraction apparatus of 1st or 2nd embodiment is demonstrated next. In the following description, although the case is described using the groundwater collecting apparatus 10 of the first embodiment, it is needless to say that the groundwater collecting apparatus of the second embodiment may be used.
FIG. 7 is an explanatory view showing the configuration of the groundwater collecting system. The groundwater collection system includes the groundwater collection device 10 of the first embodiment, a switching valve 30 and an air compressor 40. The groundwater collecting 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 collecting water into the water collecting pipe 15, high-pressure air is sent by the switching valve 30 through the air pipe 13-1 and the air is discharged through the air pipe 13-1. Then, the piston rod of the air cylinder 11 extends downward, the water collection pipe 15 whose open end is closed by the rubber plug 16 descends, and the injection needle 18 penetrates the rubber plug 16 to collect water. It will be. On the other hand, when the water collection to the water collection pipe 15 is completed, the switching valve 30 is switched to feed high pressure air through the air piping 13-2 and discharge the air through the air piping 13-3. Then, the piston rod of the air cylinder 11 ascends and returns to the original position, the water collection pipe 15 whose open end is closed by the rubber plug 16 ascends, and the injection needle 18 is pulled out of the rubber plug 16.

  The use of the groundwater collecting apparatus and the groundwater collecting system of the first or second embodiment is not particularly limited, but can be suitably used for collecting contaminated groundwater. In addition, guidelines (revision second edition) about investigation and measures based on the Soil Contamination Countermeasures Law were announced in August 2012 by Ministry of the Environment, Water and Atmospheric Environment Bureau, Soil Environment Division, and Appendix 7_4 of the guidelines As a water collecting method, a method using a water collecting device is mentioned. In the method using the water collector, the groundwater collecting apparatus and the groundwater collecting system of the present embodiment can be suitably used.

DESCRIPTION OF SYMBOLS 10 Ground water sampling device 11 Air cylinder 12-1, 12-2 Air adapter 13-1, 13-2 Air piping 14, 14A, 14B Water collection pipe holding part 15 Water collection pipe 16 Rubber stopper 17 Injection needle fixing part 18 Injection needle 19 Collection Water body 20-1 first casing 20-2 second casing 21-1, 21-2 lid 22 piping

Claims (6)

A water collection pipe having one open end, the open end closed by a plug and the inside being at a pressure lower than atmospheric pressure;
A water collecting pipe holding portion for holding at least a part of the water collecting pipe excluding the open end;
Drive means for driving the water collecting pipe holder in the vertical direction;
An injection needle and a water collection unit having a water collection body connected to the injection needle;
The water collection pipe holding part holding the water collection pipe, the drive means, and a case that accommodates the water collection part excluding the water collection body inside;
Equipped with
A groundwater collecting apparatus, wherein the injection needle is made to penetrate the plug by lowering the water collecting pipe holding portion holding the water collecting pipe by the driving means, and the groundwater flowing from the water collecting body is collected in the water collecting pipe .   The groundwater collecting apparatus according to claim 1, wherein the water collecting pipe holding portion has a cylindrical shape with one end opened, and the water collecting pipe is fitted and held in the cylindrical water collecting pipe holding portion.   The groundwater collecting apparatus according to claim 1 or 2, wherein the driving means is a cylinder, and a piston rod of the cylinder is joined to an upper portion of the water collecting pipe holding portion.   The light emitting element and the light receiving element facing each other are disposed on the side surface of the water collecting pipe holding part, and when the water collecting pipe is inserted into the water collecting pipe holding part, the light receiving element receives the transmitted light from the water collecting pipe The groundwater collecting apparatus according to any one of claims 1 to 3, wherein the collection of groundwater in the water collection pipe is detected by detecting.   Adjacent light emitting elements and light receiving elements are disposed on the upper surface of the water collecting pipe holding part, and when the water collecting pipe is inserted into the water collecting pipe holding part, the light receiving elements are the upper surface of the groundwater in the water collecting pipe The groundwater collecting apparatus according to any one of claims 1 to 3, wherein water collection of groundwater in the water collection pipe is detected by detecting reflected light from the water supply pipe. A water collection tube having one open end, the open end closed by a plug and having an internal pressure lower than atmospheric pressure, and a water collection tube holding at least a portion other than the open end of the water collection tube The water collecting pipe holding part holding the water collecting pipe, the water collecting part having the holding part, the driving means for driving the water collecting pipe holding part in the vertical direction, the injection needle and the water collecting body connected to the injection needle A groundwater collecting device including the driving means and a case for housing the water collecting unit except the water collecting body therein, disposed at a collecting position of groundwater;
The injection needle is made to penetrate the plug by lowering the water collection tube holding part holding the water collection tube by the drive means controlled from the ground by the drive means, and the underground water flowing in from the water collection body is collected Groundwater sampling method to collect water in the water pipe.

Images