JP3451258B2 - Groundwater observation method and groundwater observation device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a groundwater observing method and a groundwater observing device which are set as a unit in a borehole and are suitable for measuring and observing groundwater in an underground aquifer. .

[0002]

2. Description of the Related Art In recent years, when taking measures against pollution of groundwater, securing drinking water, industrial water, etc., and constructing various structures (buildings, etc.), drilling boring holes to collect groundwater for each aquifer. Water sampling and observation surveys are being conducted to investigate the quality of water (pollution) and the amount of groundwater for each aquifer. In the conventional water sampling / observation survey, after setting the strainer pipe in the borehole after detecting the depth and layer thickness of each aquifer by drilling the borehole and measuring the resistivity in the ground. Then, groundwater in the aquifer introduced into the strainer pipe is sampled by a sampling probe or pump, and the amount of water is also measured. A groundwater sampling / observation method and an observation apparatus for measuring and observing the water quality (contamination, etc.) and the amount of groundwater for each aquifer have been developed (for example, Japanese Utility Model Publication No. 4-7278, JP-A-4-7278). 85484, Japanese Patent No. 29165
No. 21, etc.)

[0003]

[Problems to be Solved by the Invention] Conventional groundwater sampling
The observation method and its water sampling / observation equipment are such that the groundwater of each aquifer is made to flow into the strainer pipe set in the borehole as described above, and the groundwater flowing into the pipe is sampled for each aquifer. It is also effective for investigation of water pollution due to water sampling, since it is also used to measure and observe the amount of water, etc., but groundwater in the aquifer that flows into the pipe is basically in the aquifer. Because of variations in the flow velocity and the like, which are subject to variations, it is not possible to accurately detect the state of groundwater in the aquifer (flow rate, water volume, etc.) by measuring and observing groundwater as described above. Not only an ordinary groundwater survey, but also a survey that is not necessarily effective as a survey to respond to landslides, ground improvement, and liquefaction of soil, etc., and issues such as the need to further improve groundwater measurement, observation performance, and reliability It has become.

The present invention was developed in order to solve the above-mentioned problems, and the purpose thereof is to provide a groundwater intake section attached to a strainer double pipe and a groundwater of an aquifer in a measuring pipe. By individually introducing and introducing, and measuring and observing the water level and water pressure of each groundwater in the aquifer, the state of groundwater in the aquifer can be easily and accurately detected. , To provide a groundwater observation method and a groundwater observation device with improved reliability.

[0005]

DISCLOSURE OF THE INVENTION The present invention is directed to a groundwater intake section divided by a pair of upper and lower partition means corresponding to an aquifer based on boring detection between an outer tube and an inner tube of an inner-outer double tube. And a strainer double pipe that is connected to the groundwater intake part and has a measurement pipe that extends upward in the inner space of the inner pipe.Set the strainer double pipe in the boring hole and set the groundwater intake part. Taking in groundwater from the aquifer,
Introduce the groundwater in the groundwater intake into the measuring pipe,
Characterized by the method of observing groundwater that measures the water level of the groundwater column in the pipe for measurement, it is a strainer double pipe reinforced by interposing an inner / outer double pipe and a pair of inner and outer partition means, and the groundwater intake part is Since it is formed by interposing a pair of inner and outer partitioning means that correspond to the aquifer based on the boring detection, a space for taking in each groundwater is secured, and the required aquifer is accurately matched in the borehole. Therefore, only the groundwater in the required aquifer is effectively taken in for a long period of time. The measuring pipe extends upward in the inner space of the inner pipe and is protected and stabilized.Introducing groundwater in the groundwater intake part makes it especially effective for changes in groundwater flow and water pressure in the aquifer. By forming a stable water column that is not affected and measuring the water surface of the water column near the surface of the earth, the groundwater level of the aquifer can be easily and accurately detected. If necessary, repeat the above measurements for a long period of time and observe. Water level measurement,
The observation is based on boring detection, and the aquifer data (depth and thickness of the aquifer) as well as the groundwater volume and pressure of the aquifer,
It can be effectively obtained as basic detection data such as the flow velocity and its change. In addition, groundwater in the measuring pipe is easily sampled near the surface of the ground and analyzed to detect water pollution, etc., which effectively enhances the observation performance and reliability of groundwater.

In the above-mentioned groundwater observation method, a plurality of groundwater intakes are formed by partitioning each aquifer, and groundwater of each aquifer is individually taken into each groundwater intake, and each groundwater intake is A plurality of measurement pipes are connected to each other and extended upward in the inner space of the inner pipe, and the groundwater in each groundwater intake part is individually introduced into each measurement pipe, and the groundwater column in each measurement pipe is installed. It is characterized in that each water level is measured individually, and the above-mentioned groundwater measurement, observation, and water sampling can be performed easily and efficiently with the same high accuracy for each aquifer. Characterized by measuring the water pressure of the groundwater taken into the groundwater intake by a water pressure sensor attached to the groundwater intake of the strainer double pipe, and taken into the groundwater intake by the water pressure sensor Measure groundwater pressure to improve groundwater pressure measurement and observation performance. Plural boring holes are bored at an interval from each other, and a corresponding measuring pipe or a strainer double pipe with a water pressure sensor is set in each boring hole, and the water level of each groundwater in each boring hole or Characterized by observing water pressure or repeatedly measuring over a long period of time, the groundwater of each aquifer is measured and observed over a wide range, and its three-dimensional, high-precision measurement is performed over a wide area. By observation, it is possible to detect aquifer distribution, groundwater distribution, water pollution, etc., and respond not only to ordinary groundwater surveys and water pollution surveys but also to landslides, ground improvement, and liquefaction of sediment. Demonstrate comprehensively excellent groundwater measurement, observation performance, and reliability, such as being more effective as an underground survey.

Further, a groundwater intake part for taking in groundwater of the aquifer is formed between the inner and outer double pipes by dividing the aquifer based on the boring detection into a pair of upper and lower inner and outer partitioning means, and the groundwater intake is formed. A strainer double pipe that is connected to the inlet part and extends upward in the inner space of the inner pipe to install the groundwater in the groundwater intake part and set it in the boring hole. It is characterized by a groundwater observation device equipped with a water level sensor for measuring the water level of the groundwater column, and this strainer double pipe is reinforced by interposing an inner / outer double pipe as an inner / outer partitioning means. In addition, by installing a groundwater intake part and a measuring pipe that correspond to the aquifer by interposing a pair of upper and lower partitioning means based on boring detection, it is easy to form a compact unit structure with excellent strength. It is. The groundwater intake part is highly aligned with the required aquifer, and has an excellent groundwater intake performance, such as ensuring a space for intake of the groundwater only. The measuring pipe extends upward in the inner space of the inner pipe and is protected and stabilized by the inner and outer double pipes to form the water column of groundwater introduced from the groundwater intake performance, which is effectively stabilized. In addition, it makes it easy to measure and observe the groundwater level near the surface of the earth with high accuracy, and to collect the water easily. In addition, this strainer double pipe can be easily inserted into the boring hole, and the groundwater intake can be easily and accurately set in only the required aquifer, and the intake performance of groundwater can be maintained for a long time. As a result, the above-mentioned excellent groundwater measurement and observation, as well as water sampling performance and reliability can be obtained.

Further, in the above groundwater observation device,
For multiple measurements, each of which has a grounded water intake part that is individually partitioned for each aquifer in the strainer double pipe and is connected individually to each groundwater intake part and extended upward in the inner space of the inner pipe By installing a pipe, it is possible to measure and observe groundwater individually and accurately for each aquifer, further enhancing the observation performance and reliability of groundwater. By installing a water pressure sensor inside the groundwater intake formed in the strainer double pipe and measuring the water pressure of the groundwater in the aquifer taken into the groundwater intake, the groundwater intake formed in the strainer double pipe is installed. It enables easy and accurate measurement and observation of the water pressure of the groundwater at the entrance. The outer and inner pipes of the strainer double pipe are constructed by connecting the upper and lower pairs of inner and outer partitioning means, which facilitates formation of the groundwater intake part together with the upper and lower pair of inner and outer partitioning means. To increase,
The observation performance and reliability of groundwater are enhanced comprehensively.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A shows a groundwater observing method and groundwater observing apparatus according to a first embodiment of the present invention.
FIG. 2B is a modification thereof, FIG. 2 is a second embodiment, and FIG. 3 is an enlarged view of a part of the groundwater observation device of FIG. 1A. In the figure, 1 is a bowling hole, 2 and 3 are inner-outer double pipes composed of an outer pipe 2 and an inner pipe 3, etc., or a strainer double pipe in which a pair of upper and lower partitioning means is attached to form a groundwater intake portion, 2a, 2b, 2c
.. 3a, 3b, 3c .. are joint pipes that form the outer pipe and the inner pipe,
4a to 4c are groundwater intake parts for each aquifer formed between the outer pipe and the inner pipe by partially partitioning the strainer double pipe by a pair of upper and lower inner and outer partitioning means, and 5a to 5c are each groundwater intake part. , A measurement pipe for individually introducing groundwater of an aquifer extending upward in the inner space S of the inner pipe, 9 is a pedestal for fixing the upper portions of the strainer double pipe and the measurement pipe, 11,
Reference numeral 12 denotes a pair of upper and lower partitioning means interposed between the outer pipe and the inner pipe, and 2
0 is a water level sensor and water pressure sensor cable feeding tool,
21a is a water level sensor with a cable 21b, 21c is a water level detector connected to the cable 21b, 21d is a water level detection recorder connected to the cable 21b, 22a is a water pressure sensor with a cable 22b, and 22c is a water pressure detection connected to the cable 22b. A recorder, 25 is a pipe for collecting groundwater by pumping up groundwater, 26 is a computer such as a personal computer connected to a water level detection recorder and a water pressure detection recorder, a
1 to a3 are underground aquifers, b is an impermeable layer in the ground, and S is an inner space of the inner pipe.

The present invention shown in the figure shows an aquifer a1 based on boring detection between the outer pipe 2 and the inner pipe 3 of the inner and outer double pipes 2,3.
And a2, a3 corresponding to a pair of upper and lower partition means 11,
Strainer double which forms groundwater intake 4a, 4b, 4c divided by 12 and is provided with measurement pipes 5a, 5b, 5c which communicate with the groundwater intake and extend upward in the inner space S of the inner pipe 3. Pipes 2 and 3 are set, a strainer double pipe is set in the boring hole 1, groundwater is taken into each groundwater intake part 4a, 4b, 4c, and groundwater in the groundwater intake part is further measured by a pipe 5a. It is a method of observing groundwater which is characterized by measuring the water level of the water column of groundwater formed in the measuring pipe by introducing it into the pipes 5b and 5c.

Further, in the above groundwater observation method,
A plurality of groundwater intakes 4a, 4b, 4c are connected to each aquifer a1,
It is formed by dividing into a2 and a3, and the groundwater of each aquifer is individually taken into each groundwater intake part, and a plurality of measuring pipes 5
a, 5b, 5c are connected to each groundwater intake part 4a, 4b, 4c and extended upward in the inner space S of the inner pipe 3 to attach the groundwater in each groundwater intake part individually to each measurement pipe. At the very least, it is a groundwater observation method characterized by individually measuring the water level of each water column of groundwater in each measurement pipe 5a, 5b, 5c.

In the above groundwater observation method, the groundwater observation method is characterized by repeatedly measuring and observing the water level of the groundwater introduced into the measuring pipes 5a, 5b, 5c for a long period of time.

In the above groundwater observation method, the groundwater intakes 4a, 4 formed in the strainer double pipes 2, 3
The water pressure sensor 22a is attached to each of b and 4c, and the water pressure of each groundwater taken into each groundwater intake part 4a, 4b, 4c is measured by the water pressure sensor or is repeatedly measured for a long time and observed. It is a method of observing groundwater.

In the above groundwater observing method, a plurality of boring holes 1 are bored at intervals, and the measuring tubes 5a, 5b, 5c respectively corresponding to the boring holes 1 are bored.
Alternatively, the strainer double pipes 2 and 3 with the water pressure sensor 22a are set to measure the water level or water pressure of each groundwater in each boring hole 1 or the groundwater characterized by being repeatedly measured over a long period of time. Has become the observation method.

Further, the outer pipe 2 and the inner pipe 3 of the inner and outer double pipes 2, 3
Between aquifers a1 and a2, a based on boring detection
The groundwater intake parts 4a and 4 which are divided into upper and lower pairs of internal and external partitioning means 11 and 12 to take in the groundwater of the aquifer corresponding to 3
Inner pipe 3 which forms b and 4c and is connected to the groundwater intake part
Strainer double pipes 2 and 3 which are installed in the boring hole 1 by attaching measurement pipes 5a, 5b and 5c which extend upward in the inner space S of the above and which introduces groundwater of the groundwater intake part,
The groundwater observing apparatus is provided with a water level sensor 21a for measuring the water level of a water column of groundwater introduced into the measuring pipe.

In the above-mentioned groundwater observing device, a plurality of groundwater intakes 4a, 4b, 4c divided into aquifers a1, a2, a3 are formed in the strainer double pipes 2, 3 and each groundwater intake is formed. A plurality of measuring tubes 5a that are individually connected to each of the inlets and extend upward in the inner space S of the inner tube 3,
It is a groundwater observation device characterized by having 5b and 5c attached.

In the above groundwater observing device, the groundwater intakes 4a, 4 formed in the strainer double pipes 2, 3
b, 4c attached to the groundwater intake aquifer a1,
Water pressure sensor 22 for measuring the water pressure of a2 and a3 groundwater
It is a groundwater observation device characterized by the addition of a.

In the above-mentioned groundwater observing device, the outer pipe 2 and the inner pipe 3 of the strainer double pipes 2 and 3 are connected to the connecting pipes 2a, 2b, 2c.
It is a groundwater observation device characterized by being configured as 3a, 3b, 3c.

More specifically, the boring hole 1 is provided with at least a plurality of aquifers a1 to a3 by an appropriate means at a required place suitable for measuring and observing groundwater and collecting water as shown in the drawing. The depth and layer thickness of each of the aquifers a1 to a3 in the ground are determined by detecting the soil and the specific resistance obtained during the excavation by the conventional appropriate means. And almost accurately detect.

The strainer double tubes 2 and 3 are composed of a plurality of upper and lower paired inner and outer partition means 11 and 12 attached to the outer tube 2 and the inner tube 3 and measuring tubes 5a to 5c.
Are preferably relatively hard and various kinds of synthetic resins having appropriate flexibility, and are preferably connected to the connecting pipes 2a, 2b, 2c through the inner and outer partitioning means 11 and 12 (see FIG. 3). Then, the boring hole 1 is formed into an appropriate small diameter,
A group 2d of groundwater intake holes is formed for each aquifer in association with the detected depth and layer thickness of each aquifer a1 to a3. The inner pipe 3 is preferably made of various kinds of synthetic resin which are relatively hard and have appropriate flexibility, and the inner and outer partitioning means 1
1, 12 are interposed, preferably the connecting pipes 3a, 3b, 3c.
(Refer to FIG. 3) to form an appropriate small diameter with respect to the outer pipe 2, and the groundwater intake portions 4a to 4c for taking in the groundwater of the aquifer between the outer pipe 2 and the outer pipe 2 have appropriate widths and lengths. Forming formation. Further, for example, the measuring pipes 5a to 5c are attached to the inner pipes 3 of the groundwater intake units 4a to 4c by connecting pipes 5d and nuts and the like, and are extended upward in the inner space S of the inner pipes 3. . The strainer double pipes 2 and 3 are basically the inner and outer double pipes 2 and 3, and upper and lower pairs of inner and outer partitioning means 1
1, 12 are interposed to reinforce, and the groundwater intake portions 4a to 4c with the intake hole 2d group are formed corresponding to the depths and layer thicknesses of the aquifers a1 to a3 based on boring detection. In addition, the measuring tubes 5a to 5c are additionally provided to form a relatively simple and compact unit structure as shown in the drawings (see particularly FIGS. 1 and 3). In the figure, 3e is a bottom portion formed by a stopper or the like below the strainer double pipes 2 and 3 to prevent the inflow of earth and sand and groundwater into the strainer double pipes 2 and 3.

The inner and outer partitioning means 11 and 12 are composed of an inner partitioning means 11 and an outer partitioning means 12 formed of various kinds of rubber or synthetic resin having appropriate elasticity, and the inner partitioning means 11 is particularly shown in FIG. As shown in Fig. 3, appropriate strainer pipe means (screw, glue, etc.) for connecting the outer pipe 2 and the inner pipe 3 to the upper and lower surfaces by making them correspond to the diameter of the outer pipe 2 of the strainer double pipes 2, 3 Is provided for each of the connecting pipes 2a, 2b, 2c, and 3
a, 3b, 3c · also has a role of strongly connecting and connecting pipes, and corresponding to aquifers a1, a2, a3 based on boring detection, upper and lower impermeable layers b of them are paired vertically. The inner space S of the inner tube 3 is packed as required by water-tightly packing at least the space between the outer tube 2 and the inner tube 3.
Are also properly watertightly packed to form aquifers a1, a2, a
Groundwater intake sections 4a to 4c are formed by partitioning every three. When it is formed in the inner space S of the inner tube 3 as shown in the drawing, through holes for extending the measuring tubes 5a to 5c and cables upward are provided to support and stabilize the measuring tube. . Further, the outer partition means 12 is the inner partition means 1
The outer tube 1 and the boring hole 1 are watertightly packed by being integrally attached to the outer circumference of the 1 by interposing a plurality of O-rings. The outer partition means 12 can be integrally formed around the inner partition means 11 if necessary.

The measuring tubes 5a-5c are preferably made of various synthetic resins which are relatively hard and have appropriate flexibility.
On the inner pipe 3 side in the groundwater intake parts 4a to 4c (connected to specific groundwater intake parts as necessary, the illustrated example is connected to all groundwater intake parts) formed in the strainer double pipes 2 and 3 as shown in the drawing, For example, the aquifers a1 to a3 which are connected by a connecting pipe 5d or a nut, extend upward in the inner space S of the inner pipe 3 and are taken into the groundwater intake portions 4a to 4c.
The individual groundwaters are introduced to stabilize and form the water column of the groundwater, and the water surface, that is, the water level can be measured and observed for each aquifer near the surface of the earth, and it is also possible to easily collect water near the surface of the earth. .

The water level sensor 21a is the groundwater intake section 4a.
A small-diameter sensor (known sensor) that can be freely moved up and down by inserting it from above into the measuring tubes 5a to 5c individually connected to 4c to 4c is applied. For example, as shown in FIG. 1A, a cable 21a is fed by a feeding device 20, and a water level sensor 21a at the tip (known means-for detecting a small water level in a deep well) is inserted into any of the measuring tubes 5a to 5c. When reaching the water surface of the groundwater, the water level sensor outputs a water level detection signal reaching the water surface (for example, by energization), and the water level detector 21c outputs the water level detection signal by the cable 21b and the cable 21a by the feeding tool 20. Based on the input of the length signal, the water level of the aquifers a1 to a3, which are introduced into the measuring pipes 5a to 5c and form a water column, is detected, and the depth data of the aquifer based on the boring test is detected. The water level is detected in consideration of the above. If necessary, repeat measurements at any time over a long period of time to observe their water level and changes. Instead of the water level detector 21c, as shown in FIG.
The water level detection recorder 21d is connected to 1a to record the above measurement and observation. Furthermore, the groundwater in the measurement pipes 5a to 5c is sampled and analyzed near the ground by pumping up the water sampling pipe 25 or the like, and the contamination state of the groundwater is detected.

As the water pressure sensor 22a, an appropriate well-known sensor is applied, and as shown in FIGS. 2 and 3, the ground water intake portions 4a to 4c formed in the strainer double pipes 2 and 3 are attached to the inner pipe 3 thereof. Then, the water pressure of each groundwater taken into each groundwater intake part 4a-4c is measured individually, and the cable 2
Input to the water pressure detection recorder 22c connected via 2b,
The water pressure of each groundwater taken into each of the groundwater intake units 4a to 4c is individually measured and recorded by the water pressure detection recorder. In addition, the water pressure and changes of individual water in each aquifer will be individually monitored over a long period of time if necessary.

Explaining the method of observing groundwater shown in FIGS. 1 and 2, the boring hole 1 is dug into at least a plurality of aquifers a1 to a3 at a location suitable for measuring and observing groundwater as shown. The depth and layer thickness of each of the aquifers a1 to a3 in the ground are almost accurately detected together with the impermeable layer b by the conventional means such as detection of soil and resistivity obtained during excavation. Further, based on the detection of each of the aquifers, the outer pipe 2 and the inner pipe 3 are paired with the upper and lower inner and outer partition means 1.
The connecting pipes 2a to 2c and 3a to 3c through
), A plurality of groundwater intake parts 4 at desired positions of the outer pipe 2 and the inner pipe 3 in correspondence with the depth and layer thickness of each aquifer a1 to a3.
a to 4c are formed, and measuring pipes 5a to 5c are connected to the groundwater intake portions 4a to 4c, respectively, to manufacture the required strainer double pipes 2 and 3 corresponding to the aquifers a1 to a3.

Next, the strainer double pipes 2 and 3 with measuring pipes are inserted into the boring hole 1 as shown in the drawing, and the groundwater intake portions 4a to 4c are respectively provided to the aquifers a1 to a3. Individually aligned, the upper parts of the strainer double pipe and each of the measurement pipes 5a to 5c are fixed on the ground with a mount 9 or the like, and the groundwater intake portions 4a to 4c are accurately set for each aquifer a1 to a3. Then, in each of the groundwater intake portions 4a to 4c of the strainer double pipes 2 and 3, the respective aquifers a1 to a are formed.
Groundwater of 3 is taken in individually. Furthermore, each aquifer a1
The groundwater in a3 to a3 is individually introduced into each measuring pipe 5a to 5c via each groundwater intake part, and each groundwater of the aquifers a1 to a3 individually introduced in each measuring pipe is It is formed individually as a water column corresponding to the water pressure and quantity of groundwater in the water layer.

When the strainer double pipes 2 and 3 with measuring pipes are set in the boring hole 1 as described above, the groundwater of the aquifers a1 to a3 are individually introduced into the measuring pipes 5a to 5c. Form a water column. For example, as shown in FIG. 1A, the cable 21a is fed out by the feeding tool 20, the water level sensor 21 is inserted into the required measurement pipes 5a to 5c, and the detection signal is output when the water level sensor 21a reaches the water surface of the groundwater column. Then, based on the detection signal, the water level detector 21
The groundwater level of each aquifer is individually measured and recorded by the c or water level detection recorder 21d. If necessary, when the water level detector 21c inputs the detection signal, the feeding tool 2
The water level can also be detected by reading the amount of extension of the cable 21a provided at 0. In addition, the above-mentioned water level measurement is repeatedly observed as needed over a long period of time. Further, if necessary, groundwater in the aquifers a1, a2, a3 is sampled and analyzed to detect the contamination state of groundwater. It is performed only for specific aquifers a1, a2, a3 or for groundwater of all aquifers. By taking into account the aquifer data (layer depth, thickness, etc.) based on the boring detection in the water level detection, the water pressure and water amount in the groundwater of the aquifers a1, a2, a3, and the pollution state can be accurately measured. Effectively grasped.

Further, the groundwater observation method and its observation apparatus of the second embodiment shown in FIG.
In the groundwater intake portions 4a, 4b, 4c formed in the above, water pressure sensors 22a are individually attached to the inner pipes 3 of the groundwater intake portions 4a, 4b, 4c, and the groundwater pressures of the aquifers a1, a2, a3 taken into the groundwater intake portion are individually The structure is characterized in that the measurement is performed, and other configurations are basically the same as those in the first embodiment. In the inspection and observation of the groundwater pressure according to the second embodiment, the strainer double pipes 2 and 3 are set in the borehole 1 and the aquifers a1 to a3 are connected to the groundwater intake portions 4a to 4a, respectively.
4c are aligned, the groundwater of each aquifer a1 to a3 is individually taken into each groundwater intake part 4a to 4c, and the cable 22b of each water pressure sensor 22a is connected to the inner space S of the inner pipe 3.
By extending it upwards and connecting it to the water pressure detection recorder 22c, the water pressure of the required or all aquifers introduced into each groundwater intake part 4a, 4b, 4c is individually measured and recorded. Or, if necessary, repeat the measurement over a long period of time, measure, observe and record. In addition, by taking into account the above-mentioned water level detection and aquifer data (layer depth, thickness, etc.) based on boring detection, the aquifer a1,
The water pressure, the amount of water, and the like in the groundwater of a2 and a3 can be accurately and effectively grasped almost in the same manner as in the first embodiment. Also in the illustrated second embodiment, if necessary, the measurement pipes 5a to 5c as in the first embodiment are additionally provided, and the above-mentioned groundwater level measurement and observation by the water column by the measurement pipes 5a to 5c are also considered. As a result, groundwater measurement, observation performance, and reliability can be further improved.

The above-mentioned groundwater observation method and groundwater observation apparatus are constructed by excavating the boring hole 1 into a plurality of aquifers a1 to a3 at desired locations suitable for groundwater measurement and observation.
During the excavation, the depth and layer thickness of the aquifers a1 to a3 and the impermeable layer b in the ground are detected by detecting the soil and the specific resistance, and the aquifers a1 to a3 are detected. Based on the data, the groundwater intake portions 4a to 4c are formed by interposing a pair of upper and lower partitioning means 11 and 12 for each aquifer, and the measurement pipes 5a to 5c are connected to each other to form the boring hole 1 Can be easily and accurately manufactured as the required strainer double tubes 2 and 3. The strainer double pipes 2 and 3 are composed of inner and outer double pipes (outer pipe 2 and inner pipe 3) and have a pair of upper and lower partitioning means 11 and 12 for each aquifer. The unit structure is reinforced to be compact. The groundwater intake portions 4a to 4c are formed corresponding to the aquifers a1 to a3 by interposing a pair of upper and lower partitioning means 11 and 12, and the aquifers a1 to a3 in the bowling hole 1.
Each of the groundwaters of the aquifers a1 to a3 is individually taken in with high accuracy. Moreover, each measuring tube 5a-
Since 5c extends and is protected upward in the inner space S of the inner pipe 3 and is stabilized, each groundwater introduced from each groundwater intake 4a-4c into each measurement pipe 5a-5c is stored in each aquifer. The water column becomes a stable water column that is not particularly affected by fluctuations in groundwater in the water, and the water surface of each water column can be easily measured and observed with high accuracy by the water level sensor 21a and the like near the surface of the earth. Further, the groundwater in each of the measurement pipes 5a to 5c can be easily sampled and analyzed to easily detect the pollutant state of each groundwater in the aquifer. In addition, the strainer double tube 2,
3 is a unit structure reinforced as described above, and the groundwater intake portions 4a to 4c are locally provided by interposing upper and lower pairs of inner and outer partition means 11 and 12 for each aquifer a1 to a3. It is reinforced and a required intake space for taking in groundwater is secured between the outer pipe 2 and the inner pipe 3, and it is easily and accurately aligned with the aquifers a1 to a3 in the boring hole 1 so that the required amount of groundwater is long-term. Intake performance is maintained. Further, the groundwater in the groundwater intake portions 4a to 4c are individually introduced into the measurement pipes 5a to 5c, which communicate with each other and extend upward, and the stable water column in the strainer double pipes 2 and 3 is introduced. Therefore, the water level and observation of each water column can be easily and accurately performed.

As described above, the strainer double tubes 2 and 3 are set in the boring hole 1 and the respective measuring tubes 5a to 5c are set.
When the groundwater of each of the aquifers a1 to a3 is introduced, the water level of each groundwater in each of the measuring pipes 5a to 5c near the surface of the earth as shown in the drawing is determined by a water level sensor 21a with a cable to obtain a desired or The water levels of all the aquifers a1 to a3 can be easily and accurately measured. Further, the above-described groundwater intake and introduction performance is maintained in the boring hole 1 for a long period of time, and the groundwater level can be measured and observed at any time as necessary to detect changes in the level.

Further, as shown in FIG. 2, a water pressure sensor 22a is attached to each of the groundwater intake portions 4a to 4c provided in the strainer double pipes 2 and 3, for example, each water pressure sensor 22.
The cable 22b of a is extended upward, and the water pressure recorder 2 on the ground is used.
By connecting to 2c, each water pressure of the groundwater in the aquifers a1 to a3 can be easily and accurately measured. If necessary, it is possible to observe changes in the groundwater pressure by repeating the measurement of the groundwater pressure at any time. The above-mentioned groundwater observation device is provided at a low cost in a relatively simple and compact unit structure.

Further, if necessary, a plurality of boring holes 1
Are bored at appropriate intervals, and the strainer double pipes 2 and 3 are set in the boring holes 1, respectively,
In each boring hole, the groundwater level and water pressure of each aquifer as described above will be measured, observed, and sampled (if necessary, carried out over a long period of time). In the case of this embodiment, the state of each groundwater in each aquifer (water volume, water pressure, flow, pollution, etc.) is accurately grasped over a three-dimensional wide range, and the aquifer,
The distribution of groundwater and the polluted state due to water sampling can be easily detected over a wide area, which is extremely effective not only for ordinary groundwater surveys and pollution surveys but also for landslide surveys and ground surveys for ground improvement. For example, as shown in the figure, a computer (personal computer etc.) 26 is connected to each water level detection recorder 21.
It connects with d and each water pressure detection recorder 22c, and inputs the detection signal of each water level and each water pressure to the computer (personal computer etc.) 26, processes with the detection data of each aquifer,
It is possible to detect the above-mentioned distribution of groundwater, the state of pollution due to water sampling, etc. over a wide range efficiently and effectively.

In each of the above-mentioned embodiments, the groundwater intake parts 4a-4c and the measuring pipes 5a-5c are provided for each of the aquifers a1-a3, but only the required aquifers are provided if necessary. Then, the water level and water pressure of only the required groundwater are measured and observed. Further, various known and well-known means are applied to the means for measuring and observing the water level and water pressure of the groundwater, not limited to the illustrated example.

[0035]

The present invention provides a strainer double tube having a compact unit structure having the above-mentioned structure and being reinforced by interposing upper and lower pair of inner and outer partition means,
Based on the boring detection, it corresponds to each aquifer, and the groundwater intake part that secures by dividing the groundwater intake space is formed for each aquifer, so the groundwater intake part of the strainer double pipe is inside the boring hole. It can be easily and accurately matched to the required aquifer, and only the required groundwater can be effectively taken into the groundwater intake part. The measurement pipe, which is connected to the groundwater in the groundwater intake part, has an arrangement that extends upward in the inner space of the inner and outer double pipes and is protected and stabilized, and the groundwater in the measurement pipe is the groundwater in the aquifer. It becomes a stable water column that is not significantly affected by changes in water pressure, etc., and the water level (water surface) of the water column can be easily measured and observed near the surface of the earth, and the state of groundwater in the aquifer can be easily and accurately grasped. The strainer double tube is stabilized in the boring hole for a long period of time, and the above-mentioned measurement is repeated as necessary to enable long-term observation. The above-mentioned water level and observation can be effectively obtained as basic data such as the amount of water, the water pressure, the flow velocity, and the change of each groundwater in the aquifer. Furthermore, the groundwater introduced into the measurement pipe is easily sampled near the surface of the ground for analysis, and contamination of groundwater can be easily detected, thus significantly improving groundwater observation performance and reliability.

In the above-mentioned groundwater observation method, a plurality of groundwater intakes are formed for each aquifer, and the groundwater of each aquifer is individually taken into a plurality of measurement pipes. Each groundwater intake section communicates with each other and extends upwards in the inner space of the inner pipe to introduce the groundwater of each aquifer into each measuring pipe individually, thereby making it possible to adjust each water level of each aquifer. It enables accurate and individual measurement and observation, and facilitates measurement and observation for each aquifer with high accuracy and efficiency. In addition, by measuring the water pressure of the groundwater taken into the groundwater intake part with a water pressure sensor attached to the groundwater intake part of the strainer double pipe, similar measurement and observation performance of groundwater can be obtained. Furthermore, insert the measuring pipe or strainer double pipe with water pressure sensor into a plurality of boreholes drilled at mutual intervals, and set it to measure the groundwater level or water pressure in each borehole. Or, by repeatedly measuring and observing over a long period of time, groundwater in each aquifer can be detected with high accuracy over a three-dimensional wide area to detect aquifer distribution, groundwater distribution, water pollution, etc. In addition to the usual groundwater survey and water pollution survey, it can be effectively used as a ground survey for landslides, ground improvement, and liquefaction of soil. , Observation performance and reliability have been improved significantly.

Further, a groundwater intake part for taking in groundwater of the aquifer is formed by dividing the aquifer between the inner and outer double pipes by the inner and outer partition means based on the aquifer (specific) detected by the boring hole, and A strainer double pipe that is connected to the intake part and extends upward in the inner space of the inner pipe to install the groundwater of the aquifer that is taken in and set it in the boring hole. Is characterized by a groundwater observation device equipped with a water level sensor that measures the water level of the groundwater column that has been installed, and this strainer double pipe is an inner / outer double pipe and has inner and outer partition means on the upper and lower sides. It has a reinforced compact unit structure and has a groundwater intake part that corresponds to the aquifer based on the boring detection and secures a groundwater intake space, so it can be easily inserted into the borehole. As a result, the groundwater intake can be easily and accurately aligned and set only in the required aquifer, and the performance of introducing the groundwater into the pipe for measuring the intake of groundwater is maintained for a long time in the boring hole. Measurement of groundwater,
Observation and water sampling performance are obtained, and groundwater observation performance and reliability are effectively improved.

Further, in the above groundwater observation device,
For multiple measurements, each of which has a grounded water intake part that is individually partitioned for each aquifer in the strainer double pipe and is connected individually to each groundwater intake part and extended upward in the inner space of the inner pipe By installing a pipe, groundwater can be individually measured and observed for each aquifer, and the observation performance of groundwater
It further enhances reliability. By installing a water pressure sensor inside the groundwater intake formed on the strainer double pipe to measure the groundwater pressure of the aquifer taken into the groundwater intake, the groundwater intake installed on the strainer double pipe was installed. It is possible to measure and observe the water pressure of the groundwater at the entrance. The outer and inner pipes of the strainer double pipe are constructed by connecting the upper and lower inner and outer partitioning means to each other, so that the outer and inner pipes can be easily joined to each other through the upper and lower inner and outer partitioning means and accurately formed. In addition, the groundwater intake can be matched easily and accurately according to the aquifer, and the reliability of measurement and observation is further enhanced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view (A) showing a first embodiment of the present invention and a vertical sectional view (B) showing a modified example.

FIG. 2 is a vertical sectional view showing the second embodiment of the present invention in the ground.

FIG. 3 is a partially enlarged vertical sectional view of FIG.

[Explanation of symbols]

1 boring hole 2 outer tube 3 inner tube 2,3 strainer double tube 4a, 4b, 4c Groundwater intake 5a, 5b, 5c measuring tubes 11,12 Internal and external partitioning means 21a Water level sensor 22a Water pressure sensor a1-a3 aquifer S inside space

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) E21B 47/04 E21B 49/08

Claims (10)

(57) [Claims] 1. A groundwater intake part, which is partitioned by a pair of upper and lower partition means corresponding to an aquifer based on boring detection, is formed between the outer pipe and the inner pipe of the inner-outer double pipe, and the groundwater intake part. It is a strainer double pipe with a measuring pipe that extends upward in the inner space of the inner pipe and is connected to the inside of the inner pipe.The strainer double pipe is set in the boring hole, and groundwater from the aquifer is taken into the groundwater intake part. A method for observing groundwater, characterized in that the groundwater in the groundwater intake part is further introduced into the measurement pipe, and the water level of the groundwater column in the measurement pipe is measured. 2. The method of observing groundwater according to claim 1, wherein a plurality of groundwater intakes are formed by partitioning each aquifer, and groundwater of each aquifer is individually taken into each groundwater intake. A plurality of measurement pipes are connected to each groundwater intake part and extended upward in the inner space of the inner pipe, and the groundwater in each groundwater intake part is individually introduced into each measurement pipe,
A method for observing groundwater, characterized in that each water level of a water column in each measuring pipe is individually measured. 3. The method for observing groundwater according to claim 1 or 2, wherein the water level of groundwater introduced into the measuring pipe is repeatedly measured and observed for a long period of time. 4. The method for observing groundwater according to claim 1, 2, or 3, wherein a water pressure sensor is attached to each groundwater intake formed on the strainer double pipe, and the groundwater intake is provided by the water pressure sensor. A method for observing groundwater, characterized by measuring the water pressure of groundwater in, or repeatedly measuring over a long period of time. 5. The groundwater observation method according to claim 1, claim 2, claim 3 or claim 4, wherein a water pressure sensor attached to the groundwater intake part of the strainer double pipe is used.
A method for observing groundwater, characterized in that the water pressure of each groundwater taken into each groundwater intake part is measured or repeatedly measured over a long period of time. 6. The method for observing groundwater according to claim 1, claim 2, claim 3, claim 4 or claim 5, wherein a plurality of boring holes are provided at intervals to each other, and It is characterized by setting a corresponding measuring pipe or a strainer double pipe with a water pressure sensor, and measuring the water level or water pressure of each groundwater in each borehole or by repeatedly measuring over a long period of time. How to observe groundwater. 7. A groundwater intake part for taking in groundwater of an aquifer by partitioning the aquifer based on boring detection between the outer pipe and the inner pipe of the inner-outer double pipe, and partitioning the groundwater of the aquifer by dividing it by a pair of upper and lower partition means. And a strainer double pipe that is connected to the groundwater intake part and extends upward in the inner space of the inner pipe to install a measurement pipe for introducing groundwater in the groundwater intake part and set it in the boring hole, An apparatus for observing groundwater, comprising a water level sensor for measuring the water level of a water column in the measuring pipe. 8. The groundwater observing device according to claim 7, wherein a plurality of groundwater intakes divided into each aquifer are formed in the strainer double pipe, and each groundwater intake is connected to the inner pipe. An observation device for groundwater, characterized by being equipped with a plurality of measuring pipes extending upward in the inner space of. 9. The groundwater observation device according to claim 7 or 8, further comprising a water pressure sensor attached inside the groundwater intake formed in the strainer double pipe to measure the groundwater pressure in the groundwater intake. A groundwater observation device characterized in that 10. The apparatus for observing groundwater according to claim 7, 8, or 9, wherein the outer pipe and the inner pipe of the strainer double pipe are formed by connecting the upper and lower pairs of inner and outer partitioning means. A groundwater observation device characterized by the above.