JP2009293224A - Water sampling device and water sampling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water sampling device capable of performing a water permeable test and water sampling. <P>SOLUTION: This water sampling device 1 comprises a first packer 3 and a second packer 4 installed in a bored hole 2, a strainer pipe 5 which connects both packers 3, 4 and which has a hole 5a for flowing underground water thereinto, a first valve 6 installed just above the first packer 3, a hollow rod 7 having one end connected to the first valve 6 and the other end connected to a holding device 8 installed on the ground, a second valve 9 installed in the rod 7, a water gauge 10 for measuring the level of the underground water in the rod 7, and a storage pump 11 which is installed on the ground and which pumps up the underground water in a district to be sampled L through the rod 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a water sampling apparatus and a water sampling method for sampling groundwater in a borehole.

  As a water collection device for collecting groundwater in the ground, for example, in Patent Document 1, a double packer that closes a water collection target section in a borehole and an upper packer are provided immediately above the water collection target section. Water sampling bottles for collecting groundwater in the water, pumping means for pumping groundwater in the sampling area to the water sampling bottles, and measuring the water pressure, water quality, etc. of the groundwater pumped into the water sampling bottles The water sampling device provided with the water quality measurement means to perform is disclosed.

  In the water sampling method using this water sampling device, the water pressure measuring means measures the water pressure, water quality, etc. of the ground water in the water sampling target section pumped into the water sampling bottle after closing the water sampling target section with a double packer. Then, it is determined whether the groundwater is excavated water or formation water, and the groundwater is collected when it is determined that the groundwater is formation water.

In this water sampling operation, first, after completion of the water permeability test, the water permeability test apparatus is carried out from the borehole to the ground, and the water sampling apparatus is installed in the borehole. Next, the excavated water, etc. stored in the sampling target section blocked by the double packer is pumped by a predetermined amount, and the ground sampling water is replaced in the sampling target section with groundwater, and then groundwater is put into the sampling bottle. Collect water. Here, the predetermined amount is generally about three times the volume of the sampling target section in the borehole, and when this amount of groundwater is pumped to the ground, the groundwater in the sampling target section is completely discharged. It is assumed that it was replaced with formation water.
JP-A-6-294270

  However, when the water sampling device described above is used, the water permeability test device is carried out to the ground after the water permeability test is completed, and the water sampling device is installed. Therefore, it takes time and effort to carry out the water permeability test device and install the water sampling device. There was a problem that it took.

  In addition, since a large amount of groundwater is pumped during the permeability test, it is possible to replace the permeability test device with a water sampling device at the end of the permeability test, even though the water sampling target section is already filled with formation water. In order to mix the formation water with the drilling water, etc., the above-mentioned predetermined amount of groundwater has to be pumped again, resulting in poor work efficiency.

  In particular, when the water sampling target section is at a deep depth, it takes a lot of time to carry out the water permeability test device on the ground and install the water sampling device and to pump the predetermined amount of groundwater, and the construction period is long. There was a problem of becoming longer.

  Then, this invention is made | formed in view of said problem, The objective is to provide the water sampling apparatus which can perform a water permeability test and water sampling.

  In order to achieve the above object, a groundwater sampling apparatus according to the present invention is a water sampling apparatus for sampling groundwater in a borehole, which is connected to a cylindrical rod and has a predetermined inside of the borehole. A packer installed at a position; a pump for pumping groundwater in a section closed by the packer through the rod; and a valve provided on the rod and opening and closing the rod. (First invention).

  According to the water sampling apparatus of the present invention, since the packer, the pump, and the valve connected to the rod are provided, a desired section is closed with the packer, the valve is closed, and the rod above the valve is closed. The water permeability test can be carried out by opening the valve after pumping up the water inside the rod to make it hollow. Moreover, after completion | finish of a water permeability test, groundwater can be sampled in a rod by closing a valve | bulb, pumping up groundwater with a pump. Therefore, compared with the case where a water permeability test and a water sampling device are performed using the water permeability test device and the water sampling device, respectively, the labor and time required for carrying out the water permeability test device and installing the water sampling device after the water permeability test is completed. It can be omitted.

  In addition, after completion of the water permeability test, the volume of groundwater pumped during the water permeability test can be included as part of the predetermined amount in order to collect water without replacing the equipment in the hole. The time to pump up the groundwater can be greatly shortened.

  In the present invention, a plurality of the valves may be provided on the rod, and ground water may be collected in the rods between the plurality of valves by closing the plurality of valves.

  According to the water sampling device of the present invention, since a plurality of valves are connected to the rod, by closing the valves in a state where the rod is filled with groundwater while pumping the groundwater with a pump, Water can be collected in the rod between the valves without exposing the groundwater to air.

  In the present invention, a cylindrical water sampling bottle is provided between the plurality of valves in place of the rod, and the plurality of valves are closed, whereby the water sampling bottle between the plurality of valves is placed in the water sampling bottle. It is good also as collecting groundwater.

  According to the water sampling apparatus according to the present invention, a cylindrical water sampling bottle is provided between the plurality of valves instead of the rod, so that groundwater can be sampled without touching the air in the water sampling bottle between the valves. Can do. After sampling, the sampling bottle can be removed from the sampling system and stored as it is, so the work of transferring groundwater from the rod to a container such as a sampling bottle can be performed compared to collecting groundwater on the rod. It can be omitted.

  Moreover, since a water sampling bottle is cylindrical, even when a water sampling bottle is provided, a water permeability test can be implemented.

  The water sampling method of the present invention is a water sampling method for sampling groundwater in a borehole, a packer connected to a cylindrical rod and installed at a predetermined position in the borehole, and the packer Using a water sampling device comprising a pump for pumping groundwater in the closed section through the rod and a valve provided on the rod for opening and closing the inside of the rod, the water permeability in the section is increased. Conducting a water permeability test to be investigated, and after completion of the water permeability test, pumping the groundwater in the section with the pump, closing the valve, and collecting the groundwater in the section in the rod And

  According to the water sampling method of the present invention, since a water sampling apparatus including a packer, a pump, and a valve connected to a rod is used, a desired section is closed with the packer and the valve is closed. The water permeability test can be performed by opening the valve after pumping up the water in the upper rod to make it hollow. And after completion | finish of a water permeability test, ground water can be sampled in a rod by closing a valve | bulb, pumping up ground water with a pump. Therefore, compared with the case where the water permeability test and the water sampling apparatus are used to perform the water permeability test and the water sampling apparatus, the labor and time required for carrying out the water permeability test apparatus after the completion of the water permeability test and the work of installing the water sampling apparatus are saved. be able to.

  In addition, after completion of the water permeability test, the volume of groundwater pumped during the water permeability test can be included as part of the predetermined amount in order to collect water without replacing the equipment in the hole. The time to pump up the groundwater can be greatly shortened.

  In the present invention, a plurality of the valves are detachably provided on the rod, and the plurality of valves are closed at the same time or sequentially from the hole side toward the hole bottom side while pumping up groundwater with the pump. The ground water may be collected in the rod between the plurality of valves so as not to come into contact with air.

  According to the water sampling method of the present invention, while pumping groundwater with a pump, the plurality of valves are closed simultaneously or sequentially from the hole side toward the hole bottom while the rod is filled with groundwater. Thus, the groundwater can be collected in the rod between the valves without touching the air.

  In the present invention, the rod which is connected to the valve provided at one end of the rod from which groundwater has been collected and which has not collected groundwater is removed from the valve, and the rod from which groundwater has been collected is disposed at both ends. Remove one of the valves provided at both ends of the rod from which groundwater has been collected with the valve attached to the inside of the rod. The groundwater may be transferred into the vacuum bottle.

  According to the water sampling method of the present invention, the rod from which ground water has been collected is removed from the water sampling device with valves connected to both ends, and the ground water is transferred to a vacuum bottle, so that the ground water does not touch the air. Moreover, since groundwater is preserve | saved in a vacuum bottle, it can preserve | save so that groundwater may not be exposed to air until the time of the water quality analysis performed after sampling.

  In the present invention, a cylindrical water sampling bottle may be provided between the plurality of valves instead of the rod, and ground water may be sampled in the water sampling bottle.

  According to the water sampling method of the present invention, a cylindrical water sampling bottle is provided between the plurality of valves instead of the rod, so that ground water can be sampled without touching the air in the water sampling bottle between the valves. Can do. After sampling, the sampling bottle can be removed from the sampling system and stored as it is. Therefore, compared to collecting groundwater in the rod, the groundwater is transferred from the rod to a container such as a vacuum bottle. Can be omitted.

  According to the groundwater sampling apparatus and sampling method according to the present invention, a water permeability test and sampling can be performed.

  FIG. 1 is a schematic cross-sectional view showing a state in which a groundwater sampling apparatus 1 according to a first embodiment of the present invention is installed in a borehole 2.

  As shown in FIG. 1, a water sampling device 1 for sampling groundwater in a water sampling target section L is provided with a first packer 3 installed above and below the water sampling target section L in a borehole 2. And the second packer 4, the packers 3, 4 are connected to each other, and the strainer pipe 5 having a hole 5 a for flowing groundwater into the interior is provided, and the first packer 3 is provided immediately above the first packer 3. A valve 6, a hollow rod 7 having one end connected to the first valve 6 and the other end connected to a holding device 8 such as a boring machine installed on the ground, and a second provided in the middle of the rod 7 Valve 9, a water level meter 10 for measuring the level of groundwater in the rod 7, and a pumping pump 11 which is installed on the ground and pumps groundwater in the sampling target section L through the rod 7. Yes.

  The first packer 3 and the first valve 6, the first valve 6 and the rod 7, the rod 7 and the second valve 9, and the rod 7 and the holding device 8 are respectively connected by screws and can be removed. .

  When the pumping pump 11 is operated, the groundwater in the sampling target section L flows into the strainer pipe 5 between the first packer 3 and the second packer 4 and is pumped up to the ground through the rod 7. At that time, the first and second valves 6 and 9 are closed in a state where the inside of the rod 7 is filled with the ground water while pumping the ground water to the ground, and then the pump 6 is stopped. , Groundwater is collected in the rod 7 between the nine.

  The first and second valves 6 and 9 can be opened and closed by operating switches 12 and 13 provided on the ground.

  The pumping pump 11 is desirably installed at a position farther from the first and second valves 6 and 9 in order to prevent the heat of the motor generated by the operation of the pump from being transmitted to the ground water in the rod 7. In this embodiment, it is installed on the ground.

  Next, a method for sampling groundwater in the sampling target section L with the water sampling apparatus 1 will be described according to a work procedure.

  First, the first and second packers 3 and 4 and the rod 7 of the water sampling apparatus 1 are inserted into the boring hole 2, and compressed air is injected into both the packers 3 and 4 so as to be in close contact with the hole wall. The water target section L is closed.

  Next, in order to perform the water permeability test, the first switch 6 is closed by operating the switch 12 on the ground, and the second valve 9 is opened by operating the switch 13. Then, the groundwater stored in the rod 7 above the first valve 6 is pumped by the pumping pump 11, and the inside of the rod 7 above the first valve 6 is made hollow. The amount of groundwater pumped at this time is measured as the amount of pumped water at the start of the permeability test. When all the water in the rod 7 above the first valve 6 is pumped up, the pumping pump 11 is stopped.

  Next, the switch 12 on the ground is operated to open the first valve 6 to allow the groundwater in the water sampling target section L to flow into the hollow portion in the rod 7 to start the water permeability test.

  At the same time that the first valve 6 is opened, the groundwater rises in the rod 7, so the groundwater level recovery status in the rod 7 is measured with the water level gauge 10, the equilibrium water level and the permeability coefficient are calculated, and the permeability test is completed. To do.

  Next, when the pumping pump 11 is operated with the first and second valves 6 and 9 opened, the groundwater in the water sampling target section L is sent to the ground through the strainer pipe 5 and the rod 7. Be paid. In this way, water sampling is performed continuously, and the accumulated volume of groundwater pumped to the ground from the beginning of the permeability test (including the pumped amount at the start of the permeability test) is the predetermined amount described above. When it exceeds about 3 times the volume of the target section L, it is determined that the entire water sampling target section L has been completely replaced by formation water, and water sampling is performed.

  In the water sampling operation, the pump 7 is operated and the groundwater is pumped, and the rod 7 is filled with the groundwater, the first valve 9 is closed first, and then the first valve 6 is closed. To do. The pumping pump 11 is appropriately stopped after the second valve 9 is closed. Since both the valves 6 and 9 are closed in a state where the pump 7 is operated and the rod 7 is filled with the groundwater, the groundwater is collected in the rod 7 between the valves 6 and 9 without touching the air. .

  The order in which the valves 6 and 9 are closed is such that the upper second valve 9 is first closed and then the lower first valve is closed so that air does not enter the rod 7 between the valves 6 and 9. The valves 6 are closed in the order of closing, or both valves 6 and 9 are closed simultaneously.

  After stopping the pumping pump 11, while pulling up both the packers 3, 4, the rod 7 and the like to the ground, first, the screw connection between the holding device 8 and the rod 7 is loosened, and both the packers 3, 4, the rod 7, etc. are held in the holding device 8. Then, the screw connection between the second valve 9 and the upper rod 7 of the valve 9 is loosened, the rod 7 above the second valve 9 is removed, and finally the first valve 6 and The screw connection of the first packer 3 is loosened, and the rod 7 between the valves 6 and 9 is removed with the first and second valves 6 and 9 connected to the lower end and the upper end, respectively.

  FIG. 2 is a diagram illustrating a state in which the groundwater sampled in the rod 7 between the valves 6 and 9 is transferred to the vacuum bottle 14a.

  As shown in FIG. 2, the vacuum bottle 14a is connected to a vacuum valve 14c at the inlet, and the vacuum bottle 14a can be sealed by closing the vacuum valve 14c. Connected to the vacuum valve 14c is a suction device 14b for sucking the air in the vacuum bottle 14a to form a vacuum.

  With the vacuum valve 14c opened and the vacuum valve 14c of the vacuum bottle 14a in a state where air is contained inside, the first valve 6 on the lower end side of the rod 7 that has sampled groundwater is closed. Connecting.

  Next, the suction device 14b is operated, and the air in the connection portion between the first valve 6 and the vacuum valve 14c and the air in the vacuum bottle 14a are sucked by the suction device 14b to be in a vacuum state, and then the first The valve 6 is opened to transfer the groundwater in the rod 7 to the vacuum bottle 14a. Then, the vacuum valve 14c is closed, and the container is sealed and stored so that air does not enter the vacuum bottle 14a.

  According to the groundwater sampling apparatus 1 in the first embodiment of the present invention described above, the first and second valves 6 and 9 connected to the first packer 3, the pumping pump 11 and the rod 7 are provided. Therefore, a water permeability test can be performed. In addition, after completion of the water permeability test, ground water is collected in the rod 7 between the valves 6 and 9 by closing the first and second valves 6 and 9 while pumping the ground water with the pump 11. Can do. Therefore, compared with the case where a water permeability test and a water sampling device are performed using the water permeability test device and the water sampling device, respectively, the labor and time required for carrying out the water permeability test device and installing the water sampling device after the water permeability test is completed. It can be omitted.

  In addition, in order to collect water without replacing the equipment in the borehole 2 after completion of the permeability test, the amount of groundwater pumped at the start of the permeability test can be included as part of the predetermined amount. The time for pumping a predetermined amount of groundwater can be greatly shortened.

  Furthermore, since both the valves 6 and 9 are closed while pumping up the groundwater with the pumping pump 11 and the rod 7 is filled with the groundwater, the groundwater can be collected without touching the air. Then, by transferring the ground water in the rod 7 to the vacuum bottle 14a, the ground water can be stored without touching the air until the water quality analysis.

  And since the 1st packer 3 and the 2nd packer 4 are provided, groundwater of a desired depth can be sampled.

  Next, different embodiment of the water sampling apparatus 1 in this invention is shown. In the second embodiment of the present invention, the rod 7 between the valves 6 and 9 of the first embodiment is replaced with a water sampling bottle 22. In the following description, portions corresponding to the first embodiment are denoted by the same reference numerals, description thereof is omitted, and differences are mainly described.

  FIG. 3 is a schematic cross-sectional view showing a state in which the groundwater sampling apparatus 21 according to the second embodiment of the present invention is installed in the borehole 2.

  As shown in FIG. 3, the water sampling device 21 for sampling the groundwater in the water sampling target section L is a cylindrical water sampling bottle between the valves 6 and 9 of the water sampling device 1 of the first embodiment. 22 is provided.

  The first valve 6 and the water sampling bottle 22, and the water sampling bottle 22 and the second valve 9 are respectively connected by screws and can be removed.

  The water sampling bottle 22 is adjusted to a length that can be transported to a measuring engine or the like that performs water quality analysis. In the present embodiment, the material of the water sampling bottle 22 is stainless steel that does not affect the water quality even if groundwater is stored for a long period of time.

  The groundwater in the water sampling target section L is sampled into the water sampling bottle 22 by the same method as in the first embodiment after the completion of the water permeability test. After collecting water, pull up both packers 3 and 4 and rod 7 etc. to the ground, remove both packers 3 and 4 and rod 7 etc. from holding device 8, and then connect screw connection between second valve 9 and rod 7. Loosen and remove the rod 7, and finally loosen the screw connection between the first valve 6 and the packer 3, and with the first and second valves 6 and 9 connected to the lower and upper ends, respectively, 22 is removed.

  The groundwater sampled is stored in the water sampling bottle 22 with both valves 6 and 9 connected.

  According to the groundwater sampling apparatus 21 according to the second embodiment of the present invention described above, since the sampling bottle 22 is used, it can be stored as it is after sampling. That is, the groundwater can be stored so as not to touch the air until the water quality analysis.

  Next, 3rd embodiment in this invention is shown. The third embodiment of the present invention is an embodiment when groundwater to be sampled may touch the air.

  FIG. 4 is a schematic cross-sectional view showing a state in which the groundwater sampling apparatus 31 according to the third embodiment of the present invention is installed in the borehole 2.

  As shown in FIG. 4, the water sampling device 31 for sampling the groundwater in the water sampling target section L removes the second valve 9 from the water sampling devices 1 and 11 of the first and second embodiments, Only one valve 6 is provided.

  The first valve 6 is closed in a state where the rod 7 is filled with groundwater while the pumping pump 11 is operated and the groundwater is pumped to the ground, and then when the pumping pump 11 is stopped, the first valve 6 Groundwater is collected in the rod 7 on the upper side.

  Next, a method for sampling groundwater in the sampling target section L with the water sampling apparatus 31 will be described in accordance with a work procedure.

  First, the packers 3 and 4, the rod 7 and the like of the water sampling apparatus 31 are installed in the boring hole 2.

  Next, the first switch 6 is closed by operating the switch 12 on the ground. The groundwater stored in the rod 7 above the first valve 6 is pumped up by the pumping pump 11, and the inside of the rod 7 above the first valve 6 is made hollow. The amount of groundwater pumped at this time is measured as the amount of pumped water at the start of the permeability test. When all the water in the rod 7 above the first valve 6 is pumped up, the pumping pump 11 is stopped.

  Next, the switch 12 on the ground is operated to open the first valve 6, and groundwater in the water sampling target section L is allowed to flow into the hollow portion in the rod 7 to perform a water permeability test.

  Then, after completion of the water permeability test, the pumping pump 11 is operated with the first valve 6 opened, and the accumulated volume of the pumped ground water (starting the above water permeability test) is the same as in the first and second embodiments. Water sampling is carried out when the volume of the pumped water at the time exceeds about three times the volume of the water sampling target section L described above.

  In the water sampling operation, the pump 7 is operated and the groundwater is pumped up, and the rod 7 is filled with the groundwater, the first valve 6 is first closed, and then the pumping pump 11 is stopped. . Since the first valve 6 is closed in a state in which the inside of the rod 7 is filled with ground water, the ground water is collected in the rod 7 above the first valve 6.

  After stopping the pumping pump 11, while pulling up both the packers 3, 4, the rod 7 and the like to the ground, first, the screw connection between the holding device 8 and the rod 7 is loosened, and both the packers 3, 4, the rod 7, etc. are held in the holding device 8. Next, the screw connection between the first valve 6 and the packer 3 is loosened, and the rod 7 is removed with the first valve 6 connected to the lower end. Then, the groundwater in the rod 7 is transferred to a container such as a bottle and stored. When the rod 7 from which the groundwater has been collected is removed from the water sampling device 31 and the groundwater is transferred to the container, the end surface of the rod 7 opposite to the end surface to which the first valve 6 is connected is open. Is in contact with air.

  In the present embodiment, the case where a plurality of packers are used has been described. However, the present invention is not limited to this, and is applicable to the case where one packer is used. For example, as shown in FIG. A first packer 3 installed above the water sampling target section S from the bottom to a predetermined depth; a cylindrical suction pipe 32 connected to the lower end of the first packer 3 for sucking groundwater; When a water sampling device 33 provided with a first valve 6, a rod 7, a water level gauge 10, and a pumping pump 11 provided immediately above one packer 3 is used, the groundwater in the water sampling target section S is By operating the pumping pump 11, it flows into the suction pipe 32 and is pumped to the ground through the rod 7, so that the first rod is filled with the groundwater while pumping the groundwater to the ground. When valve 6 is closed, Groundwater is water sampling in the upper rod 7 than one valve 6.

  According to the groundwater sampling devices 31, 33 in the third embodiment of the present invention described above, the first and second packers 3, 4 or the first packer 3, the pumping pump 11, and the first valve. 6 so that the water permeability test can be carried out. In addition, after the water permeability test is completed, the groundwater can be collected in the rod 7 by closing the first valve 6 while pumping the groundwater with the pumping pump 11.

It is a schematic cross section which shows the state which installed the groundwater sampling apparatus which concerns on 1st embodiment of this invention in the boring hole. It is a figure which shows the state which transfers the ground water sampled by the rod between both valves to a vacuum bottle. It is a schematic cross section which shows the state which installed the groundwater sampling apparatus which concerns on 2nd embodiment of this invention in a boring hole. It is a schematic cross section which shows the state which installed the groundwater sampling apparatus which concerns on 3rd embodiment of this invention in a boring hole. It is a schematic cross section which shows the other Example which concerns on this embodiment.

Explanation of symbols

1, 2, 31, 33 Water sampling device 2 Boring hole 3 First packer 4 Second packer 5 Strainer tube 5a Hole 6 First valve 7 Rod 8 Holding device 9 Second valve 10 Water level gauge 11 Pumping pump 12 Switch 13 Switch 14a Vacuum bottle 14b Suction device 14c Vacuum valve 22 Sampling bottle 32 Suction pipe L, S Sampling target section

Claims (7)

A water sampling device for sampling groundwater in a borehole,
A packer connected to a cylindrical rod and installed at a predetermined position in the boring hole;
A pump for pumping groundwater in the section closed by the packer through the rod;
A water sampling apparatus comprising: a valve provided on the rod for opening and closing the inside of the rod. A plurality of the valves are provided on the rod,
2. The water sampling apparatus according to claim 1, wherein ground water is sampled into the rod between the plurality of valves by closing the plurality of valves.   A cylindrical water sampling bottle is provided between the plurality of valves in place of the rod, and the plurality of valves are closed to collect ground water in the water sampling bottle between the plurality of valves. The water sampling apparatus according to claim 2, wherein In the sampling method for sampling the groundwater in the borehole,
A packer connected to a cylindrical rod and installed at a predetermined position in the boring hole, a pump for pumping groundwater in a section closed by the packer through the rod, and provided in the rod Using a water sampling device provided with a valve for opening and closing the inside of the rod,
Conduct a permeability test to investigate the permeability in the section,
After the completion of the water permeability test, the groundwater in the section is pumped by the pump, the valve is closed, and the groundwater in the section is collected in the rod. A plurality of the valves are detachably provided on the rod,
While pumping groundwater with the pump, the plurality of valves are closed simultaneously or sequentially from the hole side to the hole bottom side so that the groundwater does not come into contact with the air in the rod between the plurality of valves. The water sampling method according to claim 4, wherein water is sampled. Connected to the valve provided at one end of the rod from which groundwater was sampled, removed the rod from which the groundwater was not sampled from the valve, the rod from which groundwater was sampled, and the valves at both ends. Remove from the water sampling device while attached,
One of the valves provided at both ends of the rod from which groundwater has been collected is connected to a vacuum bottle whose inside is in a vacuum state, and the groundwater in the rod is transferred into the vacuum bottle. The water sampling method according to claim 5.   6. The water sampling method according to claim 5, wherein a cylindrical water sampling bottle is provided between the plurality of valves in place of the rod, and ground water is sampled in the water sampling bottle.

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