JP2916521B2 - Investigation method of water sampling of multi-layered aquifer and its water sampling investigation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a plurality of aquifers in a single well by using a water collection pipe having a plurality of strainers with a water-stopper and a water-collecting pipe with a water-stop bottom having a different water-permeability ring. TECHNICAL FIELD The present invention relates to a water sampling survey method and a water sampling survey apparatus for a multi-layer underground aquifer, which individually collects and investigates groundwater in the ground.

[0002]

2. Description of the Related Art In recent years, boreholes have been excavated in the vicinity of existing wells or housing complexes to prevent pollution of groundwater, improve water quality of intake water (drinking water, industrial water, etc.), and secure a sufficient amount of water. Groundwater is repeatedly sampled over a predetermined period of time, and sampling and surveys are being conducted to investigate the pollution status, water quality, amount of water, etc. for each aquifer. In the conventional groundwater sampling survey, as shown in FIGS. 3A to 3D, a boring hole is excavated and the specific resistance in the ground is measured, and aquifers a1 to a3 (b is impermeable) After detecting the ground), a plurality of investigation holes c1 to c3 communicating with the respective aquifers are dug at appropriate intervals in the vicinity thereof, and water collecting pipes d1 to d3 are arranged in the respective investigation holes c1 to c3, A strainer section d0 at the lower part of each water collecting pipe is arranged for each of the aquifers a1 to a3, and a packer e arranged on each strainer section d0.
(Air pressure, water pressure or hydraulic pressure, etc.), and groundwater in each aquifer is repeatedly sampled repeatedly over a predetermined period, or as shown in FIGS. 4 (A) to 4 (D). Survey hole f1
Was digged into a casing near the aquifer a1, the bottom of the casing g1 was digged with freshwater h to communicate with the aquifer a1, and the groundwater in the aquifer a1 was collected and repeatedly sampled over a predetermined period. Later, the survey hole f1 is extended to a survey hole f2,
The underside of the casing g2 is digged with freshwater h to communicate with the aquifer a2, the groundwater in the aquifer a2 is similarly sampled, and the investigation hole f3, the casing g3 and the freshwater dig h are similarly drawn to form an aquifer. The groundwater of a3 is sampled, and the hydraulic sampling method is used to investigate groundwater contamination, water quality, water quantity, etc. for each aquifer based on the state of each sampled water and its inspection.

[0003]

In the conventional groundwater sampling survey, the sampling survey method shown in FIG. 3 is practically impossible due to the collapse of the boring hole and the damage of the truck, etc. As described above, drilling is performed for each of the multilayer aquifers, and a step of arranging a water collecting pipe with a packer for each of the holes requires a lot of time and effort, which increases the construction period and increases the cost. However, there is a problem in the reliability of water sampling due to a decrease in arrangement accuracy of the strainer portion of the collecting pipe due to a change in the stratum. In addition, the water sampling survey method shown in FIG.
Drilling of survey holes, freshwater drilling and its extension drilling for each aquifer,
It is necessary to repeat freshwater drilling, which takes a lot of time and effort, and the construction period becomes longer, resulting in higher costs.In addition, this freshwater driller is an open hole and easily collapses, reducing the reliability of water sampling surveys. There are issues.

[0004] The present invention has been developed in view of the above situation, and an object thereof is to provide a water collecting pipe having a plurality of strainer portions set in one inspection hole (single well). By recombining and setting up multiple water sampling pipes with different water permeability sections, the groundwater in each aquifer can be easily and efficiently sampled with high accuracy, improving the sampling performance and reliability as well as the workability. It is an object of the present invention to provide a method for investigating water sampling of a multi-layer underground aquifer and an apparatus for inspecting water sampling at a reduced cost.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a plurality of aquifers are formed by detecting a plurality of aquifers underground by excavating a survey hole and forming the same length as the thickness of each aquifer. A water collection pipe having a strainer part with a packer was placed in the inspection hole, and each strainer part was individually connected to each aquifer and formed to have the same length as the specific aquifer layer thickness. A water collection pipe with a water-stop bottom having a water-permeability section with a water-stop ring is arranged in the water-collecting pipe, and the water-permeable section is connected to a specific aquifer so as to communicate with the specific aquifer. After inflow of groundwater and sampling by pumping means, the water sampling pipe with a water-stopper with a different water stop ring formed with the same length as the layer thickness of the other aquifers is connected to correspond to other layers, The other layer of groundwater flows into the water intake pipe through the strainer part and water permeation part, and water is collected by pumping means. It is characterized by a multi-layer underground aquifer sampling method for investigating groundwater in an aquifer.It also has a survey hole that excavates underground to detect multiple aquifers, A water collection pipe having a plurality of strainer sections with water stoppage packs formed to the same length as each layer thickness, arranged in the survey hole and individually communicating with each aquifer, and a specific aquifer layer A water sampling pipe with a water stop bottom that has a water permeability section with a water stop ring formed to the same length as the thickness and communicates in correspondence with the strainer section to inflow the groundwater of a specific layer and draw water, and the other aquifer A water pipe with a water stop bottom that has a different water permeability section with a water stop ring formed to the same length as the layer thickness and communicates with the strainer section to inflow and draw water from another layer of groundwater; Of a multi-layered underground aquifer sampling device equipped with groundwater pumping means located in Based on the results of detection of multiple aquifers in the ground, a drainage pipe having a plurality of strainer sections with water stoppage packs formed to the same length as the thickness of each aquifer is placed in this survey hole. Then, each strainer section is individually communicated with each aquifer, and a water-stop bottomed sampling having a water-stop ring-permeable water-permeable section formed in the water collection pipe with the same length as the specific aquifer layer thickness. A water pipe and a water collecting pipe with a water stopping bottom having a water permeable section with a different water stopping ring formed in the same length as the layer thickness of the other aquifers are rearranged,
By separately collecting the groundwater of a specific aquifer and another aquifer using pumping means, it is possible to easily and efficiently investigate the aquifer and the amount of groundwater in each aquifer individually and efficiently. As a result, the water sampling survey performance and reliability as well as the workability have been improved and the cost has been reduced.

[0006]

[Action] A plurality of underground aquifers are detected by excavating a survey hole, and based on the result of this detection, a plurality of stop holes formed in the survey hole to have the same length as the thickness of each aquifer. A water collecting pipe having a strainer part with a water packer is arranged, and each strainer part is individually connected to each aquifer and communicated with each other, and a length similar to the thickness of a specific aquifer is formed in the collecting pipe. A water sampling pipe with a water-stop bottom having a water-permeable ring with a formed water-stop ring is arranged, and the water-permeable section is connected to a specific aquifer to communicate with the water-collecting pipe. After inflowing groundwater and sampling by pumping means, rearranging a water sampling pipe with a water-stop bottom having a different water-stop ring with a water-stop ring formed to a length similar to the thickness of the other aquifer, By separately collecting and investigating groundwater in the aquifer using pumping means, the In addition to simplifying the installation of each aquifer and increasing the placement accuracy by simplifying the relocation arrangement of each water pipe, it is possible to easily and accurately collect the groundwater in each aquifer and to investigate the amount of this groundwater individually. It demonstrates excellent groundwater sampling performance and reliability, as well as the ability to investigate groundwater volume. In addition, the construction cost and the water sampling cost are effectively reduced by the single inspection hole, the water collecting pipe and the water sampling pipe as described above.

[0007]

FIG. 1 shows an embodiment of a water sampling survey method and an apparatus for water sampling of a multilayered aquifer according to the present invention, and FIG. 2 shows an embodiment of a water sampling pipe thereof. In the figure, a1, a2, and a3 are the detected aquifers in the ground, b is the impermeable ground in the detected ground, 1 is a drilling rod with a drill bit 1a, 2 is a survey hole for sampling survey, 3 Is a collecting pipe having a plurality of strainer parts 5a to 5c with a water stopping pack 4, 6 is a cleaning pipe, 7 is a cleaning air pipe, 8 is a water collecting pipe with a water stopping bottom 11 having a water transmitting ring 9 and a water permeable section 10a, Reference numeral 18 denotes a water collection pipe with a water stop bottom 11 having water permeation parts 10b and 10c with a water stop ring 9, 12 denotes a water pumping means (submersible pump), and K denotes a characteristic curve of the underground resistivity.

In the illustrated embodiment, a plurality of aquifers a1 to a3 underground are detected by excavating a survey hole 2 and a plurality of water stoppages formed to have the same length as the thickness of each aquifer. A water collecting pipe 3 having strainers 5a to 5c with a trolley 4 is arranged in the investigation hole 2, and each strainer is individually connected to each aquifer to communicate with the specific aquifer a1. A water collection pipe 8 having a water stop ring 11 having a water stop ring 9 and a water stop ring 11 having a water stop ring 9 formed in a similar length is disposed in the water collection pipe 3, and the water transfer part 10a is communicated with a specific aquifer a1. Then, the specific layer a is inserted into the water sampling pipe 8 through the strainer portion and the water permeable portion.
After the groundwater of No. 1 flows in and is sampled by the pumping means 12, the water sampling pipes 18 having different water stop rings 9 and the water permeable portions 10b and 10c formed to have the same length as the other aquifers a2 and a3.
Is made to correspond to the other layers a2 and a3, and the water sampling pipe 1 is passed through the strainer portions 5b and 5c and the water permeable portions 10b and 10c.
8, groundwater of other layers a2 and a3 flows into the pumping means 12
In this method, the groundwater in each aquifer is sampled and the groundwater in each aquifer is surveyed.

An investigation hole 2 for excavating underground to detect a plurality of aquifers a1 to a3, and a strainer part with a plurality of water stoppage packs 4 formed to have the same length as each of the plurality of aquifers. A water collecting pipe 3 having 5a to 5c and arranged in the investigation hole 2 and individually communicating with each aquifer, and a water stop ring formed to have a length similar to the layer thickness of the specific aquifer a1. Permeable part 10 with 9
a, the length of which is the same as the layer thickness of the other aquifers a2, a3, which communicates with the strainer portion 5a and which communicates with the groundwater of the specific layer a1 to flow in and collect water. Has different water-permeable portions 10b and 10c with water-stop rings 9 formed therein and communicates with the strainer portions 5b and 5c in correspondence with the other layers a.
2. A multi-layer underground aquifer characterized by comprising a water sampling pipe 18 with a water stop bottom 11 for inflowing and sampling the groundwater 2 and a3, and a groundwater pumping means 12 disposed in the water sampling pipes 8, 18. It is a water sampling survey device.

More specifically, in FIG. 1A, in the drilling step shown in FIG. 1A, for example, an investigation hole 2 is excavated deep underground by a boring rod 1 with an excavation bit 1a, and the excavation soil of the investigation hole 2 is used. Or using the survey hole 2 to measure the specific resistance under the ground (reciprocal of the electric conductivity of the ground itself) by appropriate means, and obtain and analyze a characteristic curve K of the specific resistance as shown in FIG. 1B. Thereby, the depth, layer thickness, etc. of the impermeable ground b underground and the plurality of aquifers a1 to a3 are easily and accurately detected. If necessary, the specific resistance can be measured with the short electrode and the long electrode to increase the detection accuracy.

Next, in the step of arranging the water collecting pipes 3 shown in FIG. 1C, the water collecting pipes 3 (for example, about 75 mmφ) are provided with a plurality of strainers formed to have the same thickness as the aquifer layers a1 to a3. The parts 5a to 5c are formed, and the water stopping pack 4 is attached to the outside of the upper and lower parts of each strainer part. Each strainer part 5a-5c is aquifer a1-a1 as shown in the figure.
A large number of holes are formed at a depth of a3 and a length similar to each layer thickness. Each of the water stopping packs 4 is arranged on the outer periphery of the water collecting pipe 3, and is inflated by an air pressure, a water pressure or a hydraulic pressure through an appropriate pipe (not shown) to stop water between the water collecting pipe 3 and the inspection hole 2. I have. As described above, the water collecting pipe 3 having the strainers 5a to 5c with the plurality of water stopping packs 4 formed to have the same length as each layer thickness corresponding to the state of the ground, that is, each aquifer.
And placed in the investigation hole 2 and each strainer part 5a-5
c is arranged so as to correspond to each of the aquifers a1 to a3, and each of the water stopping packers 4 is inflated to stop the water between the inspection holes 2 so that the respective strainer portions correspond to the aquifers a1 to a3. In this arrangement, the groundwater in each aquifer flows individually from the strainer sections 5a to 5c.

If necessary, as shown in the cleaning step shown in FIG. 1D, a cleaning pipe 6 is disposed in the water collecting pipe 3, an air pipe 7 is disposed in the cleaning pipe, and a compressed air is formed in the lower part as shown by an arrow. As an air lift and appropriate pumping means (not shown)
, The groundwater in the water collecting pipe 3 is forcibly pumped, and the groundwater in each aquifer is allowed to flow into the water collecting pipe 3 as shown by arrows, and the slime and the like inside are discharged and cleaned. After smoothing the a3 groundwater from flowing into the water collecting pipe 3 from the strainer sections 5a to 5c, the cleaning pipe 6 and the air pipe 7 are withdrawn and removed.

Further, the step of arranging the water sampling pipe of the specific layer shown in FIG. 1E is a case where water is collected from the upper aquifer a1 as the specific layer a1 in the illustrated example. The water sampling pipe 8 has a smaller diameter (e.g., about 50 mmφ) than the water collecting pipe 3, and a large number of holes are provided at a lower portion in a range of about the thickness of the aquifer a <b> 1 to form a water permeable portion 10 a as shown in the figure. A water-stop ring 9 (see FIGS. 2C, 2D, and 2F) is fixedly provided above and below the water-permeable portion, and a water-stop bottom 11 (see FIGS. 2D and 2E) is provided at the lower end. Is disposed in the water collecting pipe 3 as shown in the drawing, and the water permeable portion 10a is arranged to correspond to the aquifer a1, and the water permeable portion 10a
Above and below, the water stop ring 9 stops the water between the water collection pipe 3 and
The lower end stops at the water stop bottom 11, and only the groundwater in the aquifer a1 is taken into the water sampling pipe 8 from the entire thickness of the aquifer a1 via the strainer portion 5a and the permeable portion 10a of the collecting pipe.

[0014] In addition, the water sampling process of the specific layer shown in FIG.
Pumping means (submersible pump) with pumping pipe 13 in water sampling pipe 8
12 is placed and pumped to collect water. This operation control, that is, a change in the water sampling speed and the water level in the water sampling pipe 8, etc., causes the aquifer a1 to change.
Estimate the amount of groundwater in the area. This water sampling is repeated over a predetermined period, and the contamination state of the water sampling and water quality tests such as hard water and soft water are performed as needed.

In the other layer water sampling process shown in FIG. 1G, in the illustrated example, other aquifers a2 and a3 are simultaneously sampled. In this case, a water sampling pipe 18 having water permeable portions 10b and 10c corresponding to the aquifers a2 and a3 is applied as shown in the drawing, and the water sampling pipe 18 is arranged in the water collecting pipe 3 to form the aquifer a2. And the groundwater in a3 into the strainer 5
b, 5c and the entire thickness of the aquifers a2 and a3 via the water permeable sections 10b and 10c, into the water sampling pipe 18, dispose the pumping means 12 as shown in FIG. Water is sampled (the pumping means 12 is not shown in FIG. 1F). This water sampling is also repeated over a predetermined period, and the contamination state of the water sampling and water quality tests such as hard water and soft water are performed as needed.

In the embodiment shown in FIG. 1, the uppermost aquifer a1
After sampling and investigating the groundwater in the lower aquifers a2 and a
In this process, the groundwater is sampled at the same time and the survey is conducted. However, it is possible to conduct a survey in which the water is sampled in various modes, such as changing the order of sampling for each aquifer or changing the order of sampling as necessary. In the above-mentioned water sampling survey, the ground is detected by one survey hole 2, and in a state where the water collecting pipe 3 is accurately set in the survey hole 2, each of the aquifers a1 to a3 is placed in the water collecting pipe. The corresponding sampling pipes 8 and 18 are easily recombined and set to conduct sampling surveys. Since the water sampling pipes 8 and 18 are arranged in the water collecting pipe 3, a water stop ring 9 such as an O-ring, which does not require expansion and contraction operations, can be used, and there is no particular damage. In addition, it has excellent exchange performance, greatly reducing the number of water sampling and surveying steps, and is easily and efficiently performed with high accuracy.

FIG. 2 shows an embodiment of the water sampling pipes 8, 18. As shown in FIG.
In the figure, reference numeral 8a denotes a water sampling main pipe provided with a female thread 31a at the lower end,
0a, 10b and 10c are provided with a large number of holes 10d.
A water-permeable portion provided with a male screw 31b and a female screw 31a at a lower portion, 8
c has an upper water-stop ring 9 and a male screw 31 at the lower end.
b, a connecting pipe provided with a female thread 31a, 8d is a bottom pipe having a lower water-stop ring 9, having a male thread 31b at an upper end, and having a water-stop bottom 11 at a lower end;
Is constructed by arranging a plurality of rubber O-rings 9b on a mounting ring 9a fixedly provided on the outer periphery of the connecting pipe 8c and the bottom pipe 8d, and exhibits excellent water stopping performance in the water collecting pipe 3. Further, the water stop bottom 11 is a weight 11a disposed in the lower part of the bottom pipe 8d.
And caps 11b and O screwed to the lower end of the bottom tube 8d.
The weight 11a can be replaced with an appropriate weight, and the water permeable portions 10a, 10b, 10c can be stabilized at predetermined positions even when the above members are made of a lightweight synthetic resin such as PVC. It has a structure that exhibits excellent water-stop performance. Each member of the water sampling pipes 8 and 18 may be an iron pipe if necessary. In each of the above members, the male screw 31b can be changed to a female screw and the female screw 31a can be changed to a male screw.

The water sampling pipes 8, 18 are used as a set of a plurality of water sampling main pipes 8a and water permeable portions 10a, 10b, 10c having different lengths, a plurality of connecting pipes 8c, a bottom pipe 8d, a water shutoff bottom 11, and the like. The connecting pipe 8 is connected to the water sampling main pipe 8a having an appropriate length.
c, and a water-permeable portion 10a of an appropriate length is
(10b, 10c), and if necessary, the connecting pipe 8c, the water permeable parts 10a, 10b, 10c, etc., are screwed together, and the bottom pipe 8d is screwed and connected to the lowermost part, and the water stop bottom 11 is attached. By doing so, sampling pipes 8 and 18 corresponding to various aquifers
And has versatility in tandem with the exchangeability as described above, thereby enabling significant cost savings. In addition, the water collecting pipe 3 is configured in a similar joint pipe mechanism as necessary.

For example, as a result of a water sampling survey as shown in FIG. 1, the groundwater in the aquifer a1 is contaminated or has poor water quality, and the groundwater in the aquifer a2 and the aquifer a3 is of good quality and a required amount of water is secured. If it is determined that the screen pipe portion 1 is excavated, a well hole 2a as shown in FIG. 1H is formed in a portion of the casing pipe 14 corresponding to the aquifers a2 and a3.
4a and 14b are provided, and the casing pipe 14 is disposed and set in the well hole 2a as shown in the figure, and a submersible pump 15 is disposed in the casing pipe, and a pumping pipe 16,
The well is easily constructed as a well by being connected to the flow dam 17 or the like via the discharge pipe 16a, and a large amount of high-quality groundwater can be pumped smoothly.

[0020]

According to the present invention, a plurality of aquifers in the ground are detected by excavating a survey hole as described above, and based on a result of the detection, each aquifer is placed in the survey hole. A water collection pipe having a plurality of strainer sections with water stoppages formed to the same length as the layer thickness is arranged, and each strainer section is individually connected to each aquifer and communicated with each other. A water collection pipe with a water-stop bottom having a water-permeable section with a water-stop ring formed to the same thickness as the aquifer layer, and a different water-stop ring formed to a length similar to the layer thickness of the other aquifers By rearranging a water collection pipe with a cut-off bottom having a permeated part with water, each groundwater in a specific aquifer and another aquifer is separately collected by pumping means and investigated, and each aquifer is investigated. Simplifies the water sampling process and facilitates the setting of rearrangement of each water sampling pipe, improving the placement accuracy In this way, it is easy to separately collect groundwater in each aquifer and to investigate the amount of groundwater, improving the efficiency, accuracy, and reliability of water collection. It also has the ability to investigate the amount of groundwater as well as the water quality. In addition, the construction cost and the water sampling cost are effectively reduced by the single inspection hole, the water collecting pipe and the water sampling pipe as described above.

Further, there is an advantage that construction and water sampling costs can be effectively reduced by simplifying the water sampling process and reducing the number of members.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view (A) to (H) of each step and apparatus showing one embodiment of the present invention.

FIG. 2 is an exploded side view (A) to (D) of each part showing an embodiment of a water sampling pipe and enlarged sectional views (E) and (F) of main parts.

FIG. 3 is a geological map showing a conventional example (A) and cross-sectional views of respective inspection holes (B) to (d).

FIG. 4 is a formation diagram (A) showing another conventional example and sectional views (B) to (d) of each inspection hole.

[Explanation of symbols]

 a1 to a3 Aquifer 2 Inspection hole 3 Water collecting pipe 4 Water stopping packer 5a to 5c Strainer section 8, 18 Water collecting pipe 9 Water stopping ring 10a to 10c Water permeating section 11 Water stopping bottom 12 Pumping means

Claims (2)

(57) [Claims] 1. A drainage pipe having a plurality of strainers with water-stopping packs formed by drilling a survey hole to detect a plurality of aquifers underground and having a length similar to the thickness of each aquifer. Is placed in the investigation hole, each strainer part is individually communicated corresponding to each aquifer, and has a water-permeable part with a water stop ring formed to the same length as the specific aquifer layer thickness A water collection pipe with a water-stop bottom is placed in the water collection pipe, and the permeate section is connected to a specific aquifer to communicate with it.The groundwater of a specific layer flows into the water intake pipe through the strainer section and the water permeation section to pump water. After collecting the water in the aquifer, the water sampling pipes with the water-permeable parts with different water stop rings formed to the same length as the thickness of the other aquifers are communicated in correspondence with the other layers, and through the strainer part and the water-permeable parts. Investigate the groundwater of each aquifer by injecting another layer of groundwater into the sampling pipe and collecting water by pumping means. Water sampling survey method for multi-layer underground aquifers. 2. A survey hole for excavating underground to detect a plurality of aquifers, and a plurality of strainer sections with water-stoppers formed to have the same length as the thickness of each of the plurality of aquifers. The strainer has a water collection pipe that is placed in the survey hole and communicates individually with each aquifer, and a water-permeable part with a water-stop ring formed to the same length as the specific aquifer layer thickness. A strainer that has a water-stopping pipe with a water-stop bottom that communicates with and inflows groundwater of a specific layer and a water-stop ring with a length similar to the thickness of the other aquifer. A multi-layer underground aquifer water sampling investigation device comprising a water sampling pipe with a water stop bottom that communicates with the section and inflows groundwater of another layer to sample water, and groundwater pumping means arranged in each water sampling pipe. .