JP2018179668A - Ground water measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ground water measurement device capable of preventing deterioration of a water sampling rubber stick of the water sampling port used in the ground water sampling device capable of sampling the ground water by suppressing a state change of the ground water during water sampling and capable of measuring the underground water pressure with a simple configuration.SOLUTION: A water pressure measurement probe 7 arranges a water pressure measurement unit 8 for measuring the water pressure in the water W filled inside a fixed shape container 30 which is provided with a container side rubber stick 32 in under part. At the time of measuring the water pressure, a gap between the water sampling rubber stick 20 and the container side rubber stick 32 is connected so that the inner part of the container 30 and the water sampling section is communicated. The water sampling rubber stick 20 is in a state of being closely covered by the water pressure measurement probe 7 and not exposed to the atmosphere.SELECTED DRAWING: Figure 8

Description

  The present invention can prevent the deterioration of the water collection rubber disc of the water collection port used in the groundwater sampling device capable of performing groundwater sampling while minimizing the state change of the ground water at the time of water collection, The present invention relates to a groundwater measuring device capable of measuring water pressure of groundwater with a simple configuration.

  Conventionally, many methods have been used for sampling groundwater and seawater. The simplest baler-type water collection method is to lower the water collection container called baler into the well and to pump up the groundwater in the well. In this baler type water sampling method, an apparatus capable of sampling water at each depth in the well has also been developed. However, the groundwater to be sampled is stagnant water in the well due to the groundwater head at the screen depth, and it may be difficult to consider it as true groundwater.

  On the other hand, there is a BAT type water sampling method for deep groundwater in the well and seawater sampling in the deep sea. In this BAT type water sampling method, it is general to use a sampling container which is vacuumed at the time of water sampling (see Patent Document 1).

  Patent Document 2 describes a tracer test method in which a waterproofing packer is provided, a tracer fluid is injected from the test section to the ground, and then groundwater containing the tracer fluid is pumped. This tracer test method is to evaluate the safety of the geological disposal of high level radioactive waste and the groundwater pollution around the general waste disposal site.

Japanese Examined Patent Publication No. 61-52415 JP, 2010-25757, A

"S & DL mini", [online], Applied Geology Co., Ltd. [search on April 4, 2017], Internet <URL: http://www.oyo.co.jp/products_lists/sdlmini-5/>

  By the way, in the conventional Barer type water collection method, since the collected groundwater is released to the atmospheric pressure, in the case of high pressure water, free gas is generated and oxidation-reduction potential (ORP) etc. occur. May. On the other hand, in the BAT type water sampling method, ground water is made to flow into the vacuumed sampling container to collect water, so when ground water pressure is high, free gas is generated along with the pressure reduction at the time of sampling. There is. That is, in the conventional groundwater sampling method, the state of the groundwater at the time of water collection changed, and there was a case where highly accurate groundwater sampling could not be performed.

  Therefore, the inventor of the present invention is provided in a water collecting section formed by a protective casing for protecting the hole wall of the borehole and a water collecting section at the lower part of the borehole or a water blocking packer provided in the middle of the borehole. A sampling port having a sampling port having a sampling rubber disc at an upper portion, a sampling probe for sampling groundwater in the sampling section from the sampling port, and the sampling probe is provided inside the protective casing, The water sampling rubber is provided in a water sampling container of a fixed shape provided with a container-side rubber disc at a lower portion, the sampling probe comprising: an inner casing for guiding a sampling probe between the ground and the water sampling port; The space between the disk and the container-side rubber disk is connected, and when collecting groundwater from the water collection port, the container volume before water collection is zero Bag-like water sampling container condition proposed groundwater sampling device provided. In this groundwater sampling apparatus, a sampling probe is used to cause the groundwater to flow into the bag-like water sampling container by groundwater pressure. Therefore, it is possible to minimize the status change of the ground water at the time of water sampling and perform the groundwater sampling. it can.

  On the other hand, water pressure measurement of ground water does not need to be true ground water and may be water that does not move very much in the casing (dead water), so a separate casing is provided and the water pressure of the water accumulated in the casing is I was measuring.

  However, since the collection of groundwater is not continuous but performed regularly, the collection rubber disc of the water collection port will be exposed to the atmosphere for a long time during the period other than the collection period, resulting in deterioration. As a result, the durability of the device is lowered, and the water collecting port is fixedly arranged underground, so that the maintainability of the device is also deteriorated.

  The present invention has been made in view of the above, and it is a water collection rubber of a water collection port used in a groundwater sampling device capable of performing groundwater sampling while minimizing the state change of groundwater at the time of water collection An object of the present invention is to provide a groundwater measuring device capable of preventing deterioration of a disc and performing a water pressure measurement of groundwater with a simple configuration.

  In order to solve the problems described above and achieve the object, a groundwater measuring device according to the present invention comprises a protective casing for protecting a hole wall of a borehole, and a water collection section or a borehole in a lower portion of the borehole. Measuring the water pressure of the groundwater in the water collection section, which is provided in the water collection section formed by the water blocking packer provided and which has a water collection port having a water collection rubber disc at the upper part, and the water collection section A water pressure measuring probe, and an inner casing provided inside the protective casing for guiding the water pressure measuring probe between the ground and the water collecting port, the water pressure measuring A water pressure measurement unit for measuring the water pressure is disposed in the water filled in the fixed-shaped container provided with the disc, and the water collection rubber disc is used when the water pressure is measured. And the container-side rubber disc are connected to communicate the inside of the container with the water collecting section, and the water collecting rubber disc is in a state of being closely covered by the water pressure measurement probe, and the container is The water filled in the inside is characterized in that it is water previously filled in the container, or underground water collected via the water collection port by communication between the inside of the container and the water collection section. .

  In the above-mentioned invention, the groundwater measuring apparatus according to the present invention is provided with a sampling probe which is used at the time of collecting water and collects the groundwater of the water collection section from the water collecting port, and the inner casing is the protective casing Inside the fixed shape container provided with a container-side rubber disc at the lower part, the sampling probe is provided inside the container and guides the sampling probe between the ground and the water collection port. And the container-side rubber disc are connected, and when collecting ground water from the water collection port, there is provided a bag-like water collection container in which the internal volume of the container before water collection is zero.

  Further, in the above-mentioned invention, the underground water measuring device according to the present invention is characterized in that the bag-like water collecting container is a pouched bag.

  In the groundwater measuring apparatus according to the present invention, in the above invention, the water pressure measuring probe and the sampling probe slide in the water pressure measuring probe and the sampling probe between the container and the bottom, and the container A guide disc having an upper injection needle set up so as to be insertable into the side rubber disc and a lower injection needle set up so as to be insertable into the water collecting rubber disc and communicating with the upper injection needle; An upper extension spring provided between the water pump and the guide disk, and a lower extension spring provided between the water collecting rubber disk and the guide disk and having a weaker extension spring force than the upper extension spring; The lower injection needle penetrates the water collection rubber disc as the container descends when measuring the water pressure of the ground water and collecting the ground water , Then the upper needle is characterized in that through said container side rubber disc.

  Further, in the above-mentioned invention, the underground water measuring device according to the present invention is characterized in that the lower injection needle is plural, and each lower injection needle is disposed offset from the central position of the guide disc.

  Further, in the groundwater measuring device according to the present invention, in the above invention, the water pressure measuring probe and the sampling probe are provided at the lower part of the water pressure measuring probe and the sampling probe in the engaged portion provided in the water collecting port. The engaging portion has an engaging portion, and at the time of measuring the water pressure of the ground water and collecting the groundwater, the engaging portion is engaged with the lower injection needle before the water sampling rubber disc with the lowering of the container. It engages with the said to-be-engaged part, It is characterized by the above-mentioned.

  Further, the groundwater measuring apparatus according to the present invention is characterized in that, in the above-mentioned invention, the water pressure measuring probe and the sampling probe are provided with a protective member for protecting the lower end of the water pressure measuring probe and the sampling probe.

  Moreover, the groundwater measuring apparatus according to the present invention is characterized in that, in the above-mentioned invention, the water pressure measuring probe and the sampling probe have the same structure except the structure in the container.

  Moreover, the groundwater measuring apparatus concerning this invention is characterized by the said water pressure measuring unit and the said bag-like water sampling container being detachable with respect to the said container in said invention.

  According to the present invention, at the time of water pressure measurement, the water collecting rubber disk and the container side rubber disk are connected to communicate the inside of the container with the water collecting section, and the water collecting rubber disk is in close contact with the water pressure measuring probe Since it is covered, the water collection rubber disc is not exposed to the air at the time of water pressure measurement other than the time of water collection, and the deterioration of the water collection rubber disc of the water collection port is prevented.

FIG. 1 is a view schematically showing a cross section of an entire configuration of a groundwater measuring device according to an embodiment of the present invention. FIG. 2: is a schematic diagram which shows the cross section of the detailed structure of a water supply port part. FIG. 3: is a schematic diagram which shows the cross section of the detailed structure of the sampling probe used at the time of water sampling. FIG. 4 is a view showing a configuration of a guide disc and an upper injection needle and a lower injection needle provided on the guide disc. FIG. 5 is a view showing a state in which the reaction force hook of the sampling probe is engaged with the engaged portion. FIG. 6 is a view showing a state in which the lower injection needle of the sampling probe penetrates the water sampling rubber disc. FIG. 7 is a view showing a state in which the upper injection needle of the sampling probe penetrates the container-side rubber disc. FIG. 8 is a schematic view showing a cross section of a detailed configuration of a water pressure measurement probe used at the time of water pressure measurement. FIG. 9 is a view showing a state in which a protective casing and an inner casing are provided at different depths. FIG. 10 is a diagram showing groundwater sampling at different depths using two inner casings in one protective casing.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

(overall structure)
FIG. 1: is the figure which showed typically the cross section of the whole structure of the groundwater measuring apparatus 1 which is embodiment of this invention. As shown in FIG. 1, the groundwater measuring device 1 has a protective casing 11 for protecting the hole wall of the borehole 10 bored to the water collection target layer E. A clay-based sealant 12 is filled between the borehole 10 and the protective casing 11. In the upper part of the water collection section E1 in the lower part of the borehole 10, a water collection port 13 is disposed. Further, an inner casing 15 is provided on the upper side of the water collection port 13 and inside the protective casing 11. The inner casing 15 guides the sampling probe 17 between the ground and the water collection port 13 when collecting water in the ground water. Further, at the time of measuring the water pressure of the ground water, the water pressure measuring probe 7 provided instead of the sampling probe 17 is guided between the ground and the water collecting port unit 13.

  The sampling probe 17 is used when collecting groundwater, and collects the groundwater of the water collection section E1 through the water collection port unit 13. On the other hand, the water pressure measurement probe 7 is used at the time of continuous measurement of the water pressure of the groundwater in the water collection section E1.

  The sampling probe 17 and the hydraulic pressure measurement probe 7 are connected by a cable 16 to a controller 18 disposed on the ground. The cable 16 has a predetermined tensile strength and has a function of suspending the sampling probe 17. The cable 16 also includes a power supply line and a communication control line.

  As shown in FIG. 1, a connection tube which extends the lower end of the protective casing 11 to the lower end of the water collecting section E1 and connects the side wall of the protective casing 11 and the water collecting port 13 provided at the upper end of the water collecting section E1. 14 is provided to make it possible to collect groundwater from outside the water collection section E1 immediately below the protective casing 11. In addition, the protective casing 11 is up to the upper end of the water collection section E1, and the borehole 10 of the water collection section E1 is backfilled with a permeable material such as sand, and the groundwater in the water collection section E1 is not disturbed. Can be collected by the water collection port unit 13.

(Water collection port part)
FIG. 2 is a schematic view showing a cross section of the detailed configuration of the water collecting port portion 13. As shown in FIG. 2, the water collection port 13 is removable via a screwing portion 22 provided at the bottom of the protective casing 11. The mounting and dismounting of the water collecting port 13 is performed by engaging the tip of a boring machine or the like with the engagement hole 23 and rotating the water collecting port 13. The water collection port 13 is provided with a water resistant rubber disk 20 capable of withstanding the groundwater pressure from the water collection hole 20a from which groundwater is collected. The mounting and demounting of the water collecting port 13 described above is mainly for the replacement work of the water collecting rubber disc 20. The water collection port portion 13 has an engaged portion 21 engaged with a reaction force hook 40 described later, which is an engagement portion provided at the lower end of the sampling probe 17.

(Sampling probe)
FIG. 3 is a schematic view showing a cross section of the detailed configuration of the sampling probe 17 used when collecting water. As shown in FIG. 3, the piston 51 delivered from the cylinder 50 moves up and down at the upper end of the probe housing 19. The cylinder 50 may be an air cylinder, a hydraulic cylinder such as oil, or may operate the piston 51 by a motor (not shown).

  In the probe housing 19, the container 30, the spacer 36, the upper extension spring 24, the guide disk 33, and the lower extension spring 25 are sequentially disposed toward the lower side from the upper side, and a tip protection sheet 38 is provided at the bottom. A protective member 39 for protecting the lower end of the sampling probe 17 is provided on the bottom peripheral edge of the probe housing 19. The protective member 39 is an elastic member that absorbs an impact or the like, and is made of, for example, a rubber or a spring.

  The upper end of the container 30 abuts on the tip of the piston 51. The probe housing 19 and the container 30 are formed of, for example, stainless steel. The lower end of the container 30 abuts on the spacer 36. The container 30 has a fixed shape, and has a bag-like water collection container 31 inside. The water collection port of the bag-like water collection container 31 is a container-side rubber disc 32 provided at the lower end of the container 30. Before the water collection, the bag-like water collection container 31 has a zero internal volume. The bag-like water collecting container 31 has a multiple structure by pouch processing. The bag-like water collecting container 31 preferably has a light shielding function.

  An upper extension spring 24 is disposed between the spacer 36 and the guide disk 33. In addition, a lower extension spring 25 is disposed between the guide disk 33 and the bottom of the probe housing 19. The guide disk 33 can slide up and down in the probe housing 19. The guide disc 33 is inserted into the water sampling rubber disc 20 through the upper injection needle 34 erected so as to be insertable into the container-side rubber disc 32 via the insertion hole 37 provided in the spacer 36 and the tip protection sheet 38 Possibly, it has a plurality of lower injection needles 35 standing upright in the lower direction and in communication with the upper injection needle 34.

  The extension spring force of the upper extension spring 24 is larger than the extension spring force of the lower extension spring 25. Thus, when the container 30 is lowered, the lower extension spring 25 is contracted first and then the upper extension spring 24 is contracted.

  The pivot shaft 41 of the reaction force hook 40 is provided inside the bottom portion of the probe housing 19, and the lower side of the reaction force hook 40 is opened radially outward by the coil spring 42 wound around the pivot shaft 41. It is energized. As shown in FIG. 4, the guide disc 33 has an inclined portion 43 which is inclined toward the upper outside. In the reaction force hook 40, the upper end of the reaction force hook 40 slides outward along the inclined portion 43 as the guide disk 33 descends, and the lower end moves inward. By this, the reaction force hook 40 engages with the engaged portion 21 of the water collecting port portion 13.

  As shown in FIG. 4, the upper injection needle 34 is disposed at the central position of the guide disc 33. On the other hand, the three lower injection needles 35 are arranged offset from the central position of the guide disc 33. The plurality of lower injection needles 35 penetrate the water sampling rubber disc 20 for each water collection, but by displacing the arrangement of the plurality of lower injection needles 35 from the center position, the penetration position of the lower injection needle 35 for each water collection Will be different. As a result, damage to the water sampling rubber disc 20 can be reduced, and the life of the water sampling rubber disc can be extended.

(Water collection operation)
Here, the water sampling operation of the sampling probe will be described with reference to FIGS. 5 to 7. The internal volume of the bag-like water collection container 31 before the start of water collection is zero. First, as shown in FIG. 5 from the position of the piston 51 in FIG. 3, when the piston 51 is lowered, the container 30, the spacer 36, the upper extension spring 24, and the guide disc 33 are integrally lowered. Will shrink. As the guide disc 33 descends, the reaction force hook 40 engages with the engaged portion 21. In this state, the lower end of the lower injection needle 35 has not reached the water sampling rubber disc 20. The reaction force hook 40 suppresses the reaction force after coming into contact with the water collection port 13 when the sampling probe 17 is lowered. Further, the reaction force hook 40 can suppress the rise of the sampling probe 17 due to the groundwater pressure.

  Thereafter, as shown in FIG. 6, when the piston 51 is further lowered, the lower extension spring 25 is further contracted, and the lower injection needle 35 penetrates the water sampling rubber disc 20. By this penetration, groundwater is discharged from the tip of the upper injection needle 34 via the lower injection needle 35 by the groundwater pressure. By this outflow, the dead water accumulated in the space in the water collection port 13 and the air in the lower injection needle 35 and the upper injection needle 34 are discharged. Therefore, it is preferable to maintain this state for a predetermined time to reliably discharge the dead water and the air described above.

  Thereafter, as shown in FIG. 7, when the piston 51 is further lowered, the upper extension spring 24 is contracted, and the upper injection needle 34 penetrates the container rubber disc 32 through the insertion hole 37. Then, the underground water is filled in the bag-like water collecting container 31. By disposing a sensor such as a pressure sensor in the container 30, it is possible to notify the control device 18 whether the groundwater is filled in the bag-like water collection container 31 or not.

  When underground water is filled in the bag-like water collection container 31, the water collection operation can be ended by performing the operations in FIG. 5 to FIG. 7 in reverse. That is, when the piston 51 of FIG. 7 is raised, the upper injection needle 34 is first pulled out of the container side rubber disc 32 by the extension spring force of the upper extension spring 24, and the container side rubber disc 32 is subjected to the upper injection by the elastic force of the rubber. The part where the needle 34 has penetrated is closed. This state is the same as the state of FIG.

  Furthermore, when the piston 51 is further raised from the state shown in FIG. 6, the lower injection needle 35 is pulled out of the water sampling rubber disc 20 by the extension spring force of the lower extension spring 25, and the water sampling rubber disc 20 is the elastic force of the rubber. Blocks the portion through which the lower injection needle 35 has penetrated. This state is the same as the state of FIG. 5, and the outflow of groundwater is stopped. Thereafter, by further raising the piston 51, the engagement of the reaction force hook 40 is released.

  Thereafter, the cable 16 is pulled to the ground side to lift the sampling probe 17 to the ground. Thereafter, the container 30 filled with groundwater in the bag-like water collection container 31 is taken out from the inside of the sampling probe 17, and the bag-like water collection container 31 is taken out from the container 30 to complete the groundwater sampling process. In addition, it is preferable that the bag-like water collection container 31 is attached to the container side rubber disc 32.

  Here, the bag-like water collecting container 31 is subjected to pouch processing having pressure resistance. Under atmospheric pressure, the bag-like water collection container 31 is in a compressed state where the internal volume of the container is zero, and underground water flows into the container by the ground water pressure. Conventionally, groundwater was collected by suction using a vacuum container, but in the present embodiment, the amount of pressure reduction of the groundwater pressure is reduced compared to the prior art, so dissolution of dissolved gas in the groundwater after water collection Etc. can be reduced.

  In addition, since no air remains in the bag-like water collection container 31, water can be collected without touching the air. In addition, dissolved gas of groundwater can be collected in a dissolved state. That is, in the present embodiment, it is possible to sample ground water without greatly changing the groundwater pressure condition at the time of collection at the present position and without touching the atmosphere.

  Furthermore, since the bag-like water collection container 31 is collected in a closed state, it does not touch the air or people after water collection. Then, the bag-like water collection container 31 can be handled as it is as a sample container for analysis. Therefore, high quality ground water can be sampled with a simple operation, and working time can be shortened.

  In particular, even when collecting groundwater contaminated with radioactive materials, it is possible to reduce the exposure risk of the workers because the operators can not directly touch the groundwater.

(Water pressure measurement probe)
FIG. 8 is a schematic view showing a cross section of a detailed configuration of the water pressure measurement probe 7 used when measuring the water pressure of ground water. As shown in FIG. 8, the water pressure measurement probe 7 is provided with a water pressure measurement unit 8 in the container 30 instead of the bag-like water collection container 31 shown in FIG. 5. The other configuration of the water pressure measurement probe 7 is the same as that of the sampling probe 17.

(Water pressure measurement operation)
The water pressure measurement unit 8 continuously measures the water pressure of the water W filled in the container 30 in a watertight structure. The water pressure measurement unit 8 can use, for example, “S & DL mini” of Applied Geology Co., Ltd. (see Non-Patent Document 1). As shown in FIG. 8, the water pressure measurement unit 8 measures the water pressure in a state where the water in the container 30 and the ground water are in communication with each other via the upper injection needle 34 and the lower injection needle 35. The generation of the state in which the water in the container 30 and the groundwater are in communication and the generation of the disconnection state are performed in the same manner as the water sampling by the sampling probe 17 (see FIGS. 5 to 7). When the water in the container 30 and the groundwater are in communication, the water pressure of the water W in the container 30 is the same as the water pressure of the groundwater. Therefore, the water pressure in the container 30 measured by the water pressure measurement unit 8 is the water pressure of the ground water.

  At the time of water pressure measurement, the water filled in the container 30 does not have to be true ground water, and may be water communicated with the ground water, so it may be water previously filled in the container 30. It may be water collected in the container 30 at the time of communication between the inside of the container 30 and the ground water.

  This water pressure measurement is continuously measured other than at the time of water sampling. Groundwater measurement is water sampling and water pressure measurement, water sampling is performed periodically, and water pressure measurement is performed at times other than water sampling. During this long-term water pressure measurement, the water collecting rubber disc 20 and the container side rubber disc 32 are connected via the upper injection needle 34 and the lower injection needle 35, and the groundwater in the container 30 and the water collecting section E1 is While communicating, the water sampling rubber disc 20 is in a state of being closely covered with the water pressure measuring probe 7. That is, the water sampling rubber disc 20 is closely covered with the tip end protection sheet 38 of the water pressure measurement probe 7. Therefore, since the water collection rubber disc 20 is not exposed to the atmosphere for a long time at the time of water pressure measurement continuously measured, deterioration of the water collection rubber disc 20 can be prevented. Since the water sampling rubber disc 20 is a rubber provided on the water sampling port 13 side fixed to the underground side, maintenance of the entire groundwater measuring device 1 becomes easy.

(Modification)
Here, as shown in FIG. 9, when the water collection depth is different, the above-described groundwater measuring device 1 may be provided for each of the water collection target layers E11 and E12. In this case, the diameter of the protective casing 61a with respect to the water collection target layer E11 is the same as the diameter of the protective casing 61b with respect to the water collection target layer E12. Further, the diameter of the inner casing 66a with respect to the water collection target layer E11 is the same as the diameter of the inner casing 66b with respect to the water collection target layer E12.

  In addition, as shown in FIG. 10, when performing water sampling of groundwater with different water sampling depths and water pressure measurement of groundwater at the same place, the inner casing 76a for the water sampling target layer E11 and the inner casing 76b for the water sampling target layer E12. Can be provided in one protective casing 71. In this case, when performing water collection and water pressure measurement on the water collection target layer E11, a water blocking packer 72, 73 is used.

  Further, the water pressure measurement probe 7 and the sampling probe 17 described above have the same structure except for the structure in the container 30, and the water pressure measurement unit 8 of the water pressure measurement probe 7 and the bag-like water collection container 31 of the sampling probe 17 have the container 30. It is preferable that it is detachable with respect to.

DESCRIPTION OF SYMBOLS 1 Ground water measuring device 7 Water pressure measurement probe 8 Water pressure measurement unit 10 Borehole 11 Protective casing 12 Clay system sealing material 13 Water collecting port part 14 Connection tube 15 Inner casing 16 Cable 17 Sampling probe 18 Control device 19 Probe case 20 Water collecting rubber Disc 20a water sampling hole 21 engaged portion 22 screwing portion 23 engagement hole 30 container 31 bag-like water sampling container 32 container side rubber disk 33 guide disk 34 upper injection needle 35 lower injection needle 36 spacer 37 insertion hole 38 tip portion Protective sheet 39 Protective member 40 Hook for reaction force 41 Rotating shaft 43 Tilting part 50 Cylinder 51 Piston 72, 73 Water stopping packer E Water collection target layer E1 Water collecting section W water

Claims (9)

A protective casing that protects the borehole wall;
A water collection port section provided at a water collection section at the lower part of the borehole or a water collection section formed by a waterproof packer provided in the middle of the borehole and having a water collection port having a water collection rubber disc at the upper part When,
A water pressure measurement probe that continuously measures the water pressure of the groundwater in the water collection section;
An inner casing provided inside the protective casing for guiding the water pressure measurement probe between the ground and the water collection port;
Equipped with
In the water pressure measurement probe, a water pressure measurement unit for measuring water pressure is disposed in water filled in a fixed-shaped container provided with a container-side rubber disc at a lower portion thereof,
During water pressure measurement, the water collecting rubber disk and the container-side rubber disk are connected to communicate the inside of the container with the water collecting section, and the water collecting rubber disk is in close contact with the water pressure measuring probe. Will be covered,
The water filled in the container may be water previously filled in the container, or underground water collected via the water collection port by communication between the container and the water collection section. Ground water measuring device. It has a sampling probe which is used at the time of water collection and which collects groundwater in the water collection section from the water collection port,
The inner casing is provided inside the protective casing and guides the sampling probe between the ground and the water collection port;
The sampling probe is connected between the water collecting rubber disk and the container side rubber disk in a fixed-shaped container provided with a container side rubber disk at a lower part, and collects groundwater from the water collecting port. The underground water measuring device according to claim 1, wherein a bag-like water collecting container in which the internal volume of the container before water collection is zero is provided.   The underground water measuring device according to claim 2, wherein the bag-like water collecting container is a pouched bag. The water pressure measurement probe and the sampling probe are
The inside of the water pressure measurement probe and the sampling probe is slid between the container and the bottom, and the upper injection needle erected so as to be insertable in the container side rubber disc and the water intake rubber disc are erected so as to be inserted A guide disc having a lower injection needle communicating with the upper injection needle;
An upper extension spring provided between the container side rubber disc and the guide disc;
A lower extension spring provided between the water collecting rubber disc and the guide disc and having a lower extension spring force than the upper extension spring;
Equipped with
At the time of measuring the water pressure of the ground water and at the time of collecting the ground water, the lower injection needle penetrates the water sampling rubber disc as the container descends, and then the upper injection needle penetrates the container side rubber disc The groundwater measuring device according to any one of claims 2 or 3, characterized in that   5. The groundwater measuring apparatus according to claim 4, wherein the lower injection needle is plural and each lower injection needle is disposed offset from the center position of the guide disc.   The water pressure measurement probe and the sampling probe have an engaging portion engaged with an engaged portion provided in the water collection port at a lower portion of the water pressure measurement probe and the sampling probe, and at the time of water pressure measurement of the ground water And when the ground water is collected, the engaging portion engages with the engaged portion before the lower injection needle penetrates the water collecting rubber disc as the container descends. The groundwater measuring device as described in any one of 2-5.   The groundwater pressure measurement device according to any one of claims 2 to 6, wherein the water pressure measurement probe and the sampling probe are provided with a protection member for protecting lower ends of the water pressure measurement probe and the sampling probe.   The groundwater pressure measurement device according to any one of claims 2 to 7, wherein the water pressure measurement probe and the sampling probe have the same structure except for the structure in the container.   The groundwater pressure measurement device according to claim 8, wherein the water pressure measurement unit and the bag-like water collection container are removable from the container.

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