JP4413079B2 - Observation well unit and well construction method using the same - Google Patents

Description

The present invention relates to a watch Hakai units and the well construction method of using the same.

  The observation well for groundwater veins is excavated for various purposes. For example, groundwater that is often used in the past is surveyed for use in drinking water, miscellaneous water, and industrial water, when using groundwater, so-called well water, in order to grasp the impact on supply capacity and surrounding environment, etc. Do. When sampling groundwater as an adverse factor in drinking water sampling, etc., the most common method is to drill a well by drilling a well and insert a measuring device into the well. The quality of groundwater flowing into the well is measured.

  As a new purpose, the geothermal heat utilization system has recently been researched as part of the effective use of natural energy, and this is the investigation of groundwater veins for this purpose. A geothermal heat utilization system is a system that is highly efficient because it uses the stable temperature of the earth as a heat source, and that is excellent in energy saving that uses a large heat capacity of the earth. In such a geothermal heat utilization system, the ground is used as a heat radiation source when using cold heat, and as a heat collection source when using heat, but the amount of heat radiation is greatly affected by the magnitude and direction of groundwater movement. It is an important condition to measure the flow direction and flow velocity of groundwater in determining and designing the scale of geothermal heat utilization system.

  FIG. 5 shows a schematic diagram of an observation well installation example when investigating groundwater veins such as the flow direction and flow velocity of groundwater for the above-mentioned purpose, and this first conventional example will be described.

  As shown in FIG. From the result of point 1, groundwater level decrease observation is mainly used as a well for groundwater flow countercurrent measurement and long-term groundwater level observation in the gravel layer (layer to be measured) distributed deeper than GL-11. Well No. It is installed at a position about 1.8m away from point 1 and its construction is performed in the following steps. (1) The excavation hole 1 is constructed by digging up to GL-14 m with a drilling diameter of Φ136 mm. (2) A vinyl chloride pipe (outer diameter Φ76 mm, inner diameter Φ67 mm) 3 having the tip strainer 2 processed therein is inserted into the excavation hole 1. The depth of the strainer 2 is between 3 m from GL-10 m to GL-13 m, and the strainer 2 is processed with an insect net # 20 mesh winding with an aperture ratio of about 7%. (3) The strainer 2 is filled with gravel (No. 2) as the filter material 4, and the shallower part is stopped with a water-stopping material (pel club) 5 and the generated soil 6, and the bottom end is a puddle (with a bottom lid) ) 7. (4) The inside of the PVC pipe 3 was washed with fresh water. (5) The upper end of the PVC pipe 3 is covered with an upper lid 11 of the PVC pipe, and the ground surface portion 8 is cured using a concrete rainwater trough 12. After constructing the observation well as described above, the groundwater flowing into the PVC pipe 3 is measured with a measuring instrument.

  The observation well construction method according to FIG. 5 is costly because it includes drilling, pipe insertion, water shielding, backfilling, and multiple processes. For this reason, it is not easy to carry out at the planning / designing stage of drilling, building, and geothermal facility construction. At the planning / designing stage, simple surveys and planning such as geological surveys and observation of the groundwater level associated therewith are not possible. In many cases, the design is based on this information, collecting existing data around the ground. However, it is often the case that the survey budget is secured at the actual construction stage and is not within the allowable value. One observation well must be installed to measure one depth at one point. If two depth measurements are required at one point, two wells are required.

  FIGS. 6 (a) and 6 (b) show two examples of excavating a simple measurement hole, which is a general water shielding method used when performing a natural water level measurement or an in-situ permeability test as a second conventional example. . In each figure, the measurement pipe 14 is inserted directly into the excavation hole 13, or the measurement pipe 14 is inserted inside the water shielding pipe 15 with the upper aquifer used for hole wall protection, The measurement pipe 15 is lowered to the hole bottom 16, buried in the sand ground (groundwater vein layer) 17 and impermeable, and measured in a measurement section 19 below the impermeable section 18.

  With the simple measurement hole, natural water level measurement and in-situ water permeability test to obtain the water permeability coefficient are possible, but there is a problem that it is impossible to measure the flow direction and flow velocity that require measurement accuracy.

As another conventional technique, there is a groundwater search method and a well pipe disclosed in Japanese Patent Application Laid-Open No. 2003-129527. However, this conventional technique has a structure different from that of the present invention, and the groundwater survey in the present invention The content has not been reached, but relates to a method for confirming the presence or absence of groundwater.
JP 2003-129527 A

  As mentioned above, the observation wells for groundwater veins are excavated for various purposes. However, the conventional technique has problems such as separate construction for boring and well drilling, which requires a longer construction period and higher construction costs. there were. In addition, one conventional observation well must be installed for one depth measurement at one point, and two wells are required when two depth measurements are required at one point. When depth measurement at a point is required, multiple wells were required, which was troublesome and costly. Further, there has been a problem that the flow direction and the flow velocity that require measurement accuracy cannot be measured conventionally. Further, the technique disclosed in Japanese Patent Application Laid-Open No. 2003-129527 has not reached the contents of the investigation in the present invention with respect to the groundwater survey, and has only been to confirm the presence or absence of the groundwater.

The present invention aims to provide a well construction method of using a saw Hakai units and which has solved the problems of the prior art.

  In order to achieve the above object, the present invention is configured as follows.

According to a first aspect of the present invention , a strainer member is inserted into a hollow tube body provided with a rotating blade made of a spiral blade at the lower end , and the strainer member is inserted by the strainer member when the hollow tube body is inserted or rotated. The hollow tube body is closed at the front end, and after being buried up to the ground layer where groundwater intake / reduction or investigation / observation is performed by penetration or rotary press-fitting of the hollow tube body, It is characterized in that formation water can flow into and out of the strainer member by opening the tip opening by rotation .

According to a second aspect of the present invention , a strainer member is inserted into a hollow tube body provided with a rotary blade at a lower end portion, and the strainer member is inserted into the hollow tube body or rotated by press-fitting the hollow tube body by the strainer member. The tip opening is closed by the reverse rotation of the hollow tube after being embedded up to the ground for water intake, reduction or investigation / observation, etc. By opening the section, groundwater can flow into and out of the strainer member .

A third invention is characterized in that, in the first or second invention, the strainer member is composed of a perforated pipe, a net, a filter material and the like.

According to a fourth aspect of the present invention, in the first to third aspects, the strainer member is provided so as to be able to enter and exit from a tip of the hollow tube body, and the strainer member is allowed to reach an upper limit when the hollow tube body is penetrated or rotationally pressed. The tip opening is closed by moving and being embedded in the hollow tube body, and after burying the groundwater intake, reduction or investigation / observation, the strainer member is left in the formation by pipe by a predetermined length upward by the reverse rotation, characterized in that formation water is possible inflow and outflow to the strainer member.

According to a fifth invention, in the first to fourth inventions, the strainer member inserted in the hollow tube body includes a tubular portion having a water passage portion and an upper end locking portion of the tubular portion provided with a water stop ring. And the lower end of the cylindrical portion constitutes a closed body of the opening of the hollow tube.

A sixth invention is characterized in that, in the first to fifth inventions, an inner intubation tube is inserted into the hollow tube body, and the strainer member is formed at a lower end of the inner intubation tube.

According to a seventh invention, in the first to sixth inventions, the strainer member inserted in the hollow tube body is provided with a measuring device capable of measuring the flow direction, flow velocity, flow rate, water temperature or water quality of groundwater . It is characterized by that.

An eighth invention is characterized in that it is used as a hollow tube body according to the first to seventh aspect of the present invention is to construct a pumping wells for groundwater used not monitoring wells only.

In the ninth invention, the hollow tube described in the first to seventh inventions is rotationally pressed into the ground, and the flow direction, flow velocity, flow rate, water temperature or water quality at one depth is measured at one point. Thereafter, the hollow tube body is rotated forward while the strainer portion is housed again, and the penetration is continued, thereby enabling measurement at a plurality of depths.

In a tenth aspect of the invention, the hollow tube described in the first to seventh aspects of the invention is rotationally pressed into the ground, and the flow direction, flow velocity, flow rate, water temperature, or water quality at one depth is measured at one point. after moving from the ground to the pull-out elsewhere in Da設underground said hollow tube body again and repeating the measurement of the.

  The present invention has the following effects.

  According to the present invention, when constructing an observation well or a pumping well for groundwater use, drilling, pipe insertion, and backfilling can be performed in one step. In addition, the entire process of installing wells including water shielding is completed by an additional process of leaving the strainer member in the groundwater vein layer by penetrating the hollow tube body or pulling it up from the rotary press-fitting position. Wells can be installed inexpensively in time, and surveys can be conducted at the planning and design stages.

  Further, according to the present invention, after measuring one depth at one point, the penetration or rotation press-fitting is continued by positive rotation of the hollow tube body while the strainer member is housed in the hollow tube again. Multiple depth measurements are possible.

  In addition, according to the present invention, the observation well unit once buried in the ground is pulled up to the ground by reverse rotation of the hollow tube body (observation well unit) with the strainer member, and is buried again at another point. This makes it possible to investigate groundwater at multiple points with one observation well unit.

  In addition, according to the present invention, since a strainer portion equivalent to the observation well unit can be constructed, it is possible to measure the flow direction and the flow velocity that require measurement accuracy.

  In addition, according to the present invention, it is possible to construct a pumping well for use of groundwater as well as an observation well.

[First Embodiment]
The observation well unit according to the first embodiment of the present invention will be described with reference to FIG. As shown in the figure, the observation well unit 20 of the first embodiment includes a hollow tube 23 having a rotary blade 21 at the lower end and an opening 22 at the lower end, and an inside of the hollow tube 23. The strainer member 24 is accommodated and can protrude from the lower end opening 22. That is, the hollow tube body 23 can be rotationally press-fitted into the ground by the rotary blades 21, and at the time of press-fitting, the strainer member 24 moves up as shown in FIG. At this time, the distal end opening 22 of the hollow tube body 23 is closed. Further, after the hollow tube body 23 is rotationally press-fitted to a predetermined depth, the hollow tube body 23 is reversely rotated and moved up to a predetermined height, so that the strainer member 24 is inserted into the penetration position as shown in FIG. In addition, the strainer member 24 can protrude from the tip of the hollow tube body 23. In addition, you may provide the rotary blade which consists of a spiral blade instead of the said rotary blade 21, and in this case, the hollow tube body 23 may be rotationally penetrated or rotationally press-fitted by the propulsive force of the spiral rotary blade. Is possible.

  The material of the hollow tube body 23 is generally composed of a steel pipe, but is not limited to a steel pipe, and may be composed of a resin-based material such as plastic. The rotary blade 21 is concentrically fixed with respect to the hollow tube body 23, rises spirally while being separated from the lower end portion 25 of the hollow tube body 23, and is formed so as to circulate about one turn to the terminal cut surface 26. Has been. The number of rotations, the opening angle, and the like of the rotary blade 2 are preferably designed to be suitable for rotary press-fitting of the hollow tube body 23 into the ground.

  An engagement step portion 27 is formed on the inner peripheral portion of the opening portion 22 formed at the tip of the hollow tube body 23. The strainer member 24 inserted into the opening 22 is provided so as to be movable up and down within a range limited by the engagement step portion 27 and the upper stopper 28 in the hollow tube body 23. In the illustrated example, the strainer member 24 is formed of a perforated pipe made of metal or the like. The strainer member 24 has a flange portion 31 at the upper end of a cylindrical portion 30 having a large number of water passage holes 29 and has a lower end pointed at the lower end. A portion 32 is provided. The outer diameter of the cylindrical portion 30 is provided so as to be slidably fitted into the distal end opening 22, and the distal end closing portion 22 also serves as the distal end closing plate of the hollow tube body 23. At the time of rotational press-fitting when the strainer member 24 is moved to the upper limit as in (a), the tip closing portion 32 is in a state of closing the opening portion 22 of the hollow tube body 23.

  In the illustrated example, the strainer member 24 is composed of a perforated metal pipe. However, in addition to this, the strainer member 24 may be composed of a metal net, a filter material, or the like, and further, the strainer member is configured by combining the above materials. You can do it. For example, a metal net 33 or a filter material may be wound around the outer periphery of the cylindrical portion 30 having the water passage holes 29 as shown in the figure.

  The strainer member 24 moves up to the upper limit position in FIG. 1A when the hollow tube body 23 is press-fitted. At this upper limit position, the flange portion 31 engages with a stopper 28 provided on the inner surface of the hollow tube body 23 to restrict upward movement. At this upper limit position, the distal end closing portion 32 opens the hollow tube body 23. The opening portion 22 is closed at the portion 22, thereby enabling the hollow tube body 23 to be smoothly rotated and pressed, and the strainer member 24 is also protected without entering earth and sand. FIG. 1A illustrates a state in which the lower end of the hollow tube body 23 is press-fitted to a predetermined depth, that is, close to the lower end 35 of the gravel layer 34 that is a groundwater vein layer.

  In FIG. 1B, after the hollow tube body 23 is press-fitted to near the lower end 35 of the gravel layer 34 that is a groundwater vein layer, the strainer member 24 is left in the gravel layer 34 and the hollow tube body 23 is rotated in reverse. A state in which the lower end portion 25 of the tubular body is pulled up to the height position of the upper end 36 of the gravel layer 34 is shown. When the hollow tube body 23 is pulled up, the strainer member 24 is provided with an appropriate downward push-down means (not shown) so that the strainer member 24 does not move up with the hollow tube body 23. It gives power.

  In the state of FIG. 1B, the groundwater flowing through the gravel layer 34 can flow into the strainer member 24 through the water passage hole 29, and the groundwater can be investigated with a measuring instrument installed in the strainer member 24. Further, since the groundwater can flow into the hollow tube body 23 through the inside of the strainer member 24, the groundwater rising in the hollow tube body 23 to a certain water level corresponding to the water pressure of the groundwater veins It can also be measured in the hollow tube body 23.

  Underground construction of the observation well unit 20 of the first embodiment is performed in the following steps.

(1) For rotational press-fitting of the hollow tube body 23 into the ground, first, as shown at the left end of FIG. The hollow tube body 23 is rotated around the axis. Thereby, the hollow tube body 23 is gradually press-fitted into the ground by the rotary blades 21 as shown in order on the right side of FIG. At this time, the strainer member 24 is moved upward by receiving the pushing force by the earth and sand, and the flange portion 31 is engaged with the stopper 28 provided in the hollow tube body 23 to prevent the upward movement. At this time, the closed portion 32 at the distal end of the strainer member 24 functions as a closed distal end that closes the distal end opening of the hollow tube body 23. Therefore, the earth and sand do not enter the hollow tube body 23, and a predetermined ground. Smooth press-fitting up to the layer.

(2) After the hollow tube 1 is rotationally press-fitted to a desired length and then reaches the gravel layer (groundwater vein layer) 34 as shown at the right end of FIG. 2, the hollow tube 23 is rotated in reverse. Thus, only the strainer member 24 is left in the groundwater vein layer 34 and pulled up to a predetermined height position. At this time, the water stop ring 37 fitted to the lower side of the flange portion 31 of the strainer member 24 is engaged with the engagement step portion 27 on the inner periphery of the distal end of the hollow tube body 23, and the stop at the engagement portion is stopped. Water is secured, and the strainer member 24 protrudes from the lower end of the hollow tube body 23 to the lower limit.

  As a result of the above operation, the water flowing through the gravel layer (groundwater vein layer) 34 flows into and out of the strainer member 24 through the water passage hole 29, so that various measuring instruments (not shown) installed inside the strainer member 24 are shown. The flow direction, flow velocity, flow rate, water temperature, water quality, etc. can be measured. The water level and the like are measured at the level of water flowing into the hollow tube body 23 and may be measured by pumping ground water that has risen through the hollow tube body 23. For this reason, the hollow tube body 23 is kept clean. In the present invention, the lower end opening 22 is closed by the strainer member 24 when the hollow tube body 23 is press-fitted. Even after the rotary press-fitting without entering, the ground water filtered by the strainer member 24 enters the hollow tube body 23, so that various kinds of efficient measurements can be performed without the need for troublesome washing.

  Further, in the case where a plurality of depths need to be measured at a single point to be measured, such as when the groundwater vein layer 34 is deep underground, after measuring one depth, the strainer portion 24 is again connected to the tube. While the hollow tube body 23 is housed in the body, it is possible to continuously rotate and press-fit the hollow tube body 23 and continuously measure different depths at one point. Further, when the length of the hollow tube body 23 is insufficient due to the measurement depth, the underground water vein layer 34 at a predetermined depth can be investigated while adding the plurality of hollow tube bodies 23.

  Furthermore, when measuring the groundwater vein layer 34 at a plurality of points using the observation well unit 20 of the present invention, the hollow tube body 23 of the observation well unit 20 that has finished the measurement at one point is reversely rotated, The unit 20 once buried in the ground is pulled up to the ground, and the hollow tube body 23 is penetrated and installed again at another point, so that one observation well unit 20 can smoothly investigate groundwater at a plurality of points. It becomes possible.

[Second Embodiment]
3 and 4 show a second embodiment. In the second embodiment, the inner tube 38 is inserted into the hollow tube body 23, and the strainer member 24 is integrally formed in the lower portion of the tube 38 to form a double tube structure. This double-pipe structure is different from the first embodiment, the other configurations are the same as those of the first embodiment, and the construction mode is also the same. In the second embodiment, since the inner tube 38 extends integrally with the strainer member 24 to the upper part in the hollow tube body 23, a push-down force can be applied to the strainer member 24 by the upper end operation of the inner tube 38. . As a result, the hollow tube body 23 is press-fitted to the vicinity of the lower end 35 of the gravel layer 34 that is a groundwater vein layer, and then the strainer member 24 is left on the gravel layer 34 to rotate the hollow tube 23 in the reverse direction and the upper end 36 of the gravel layer 34. When the strainer member 24 is pulled up to the vicinity, it is possible to easily apply a downward force to the strainer member 24 by pushing down the upper portion of the inner tube 38 so that the strainer member 24 does not move up with the hollow tube body 23. Other functions and effects are the same as those of the first embodiment.

  The observation well unit 20 of the present invention can be left in the ground and constructed as a pumping well for use of groundwater. In this case, when the outer surface of the hollow tube 23 needs to be anticorrosive, it may be coated with anticorrosion, or may be coated with polyethylene, urethane, or the like. The inner surface may be coated with epoxy or the like. The material of the hollow tube 1 is not limited to a steel pipe, and the hollow tube 1 may be formed of a resin-based material such as plastic.

  In addition, when performing the measuring method of groundwater with the observation well of this invention, you may utilize a conventionally well-known measuring method, About the example, the conventional method shown to Fig.7 (a), (b), (c) A measurement example will be applied mutatis mutandis.

  FIG. 7A is a schematic diagram showing an in-situ permeability test, FIG. 7B is a schematic diagram showing flow direction flow velocity measurement, and FIG. 7C is a schematic diagram showing flow velocity measurement by electric conductivity.

  In the in-situ permeability test (steady method / unsteady method) of FIG. 7A, a small-diameter lift pump 41 is lowered into the measurement pipe 40 inserted into the excavation hole 39, and an arbitrary amount is pumped by this pump 41 to obtain the water level. Obtain the relationship between the amount of decrease and the amount of pumped water, and calculate the hydraulic conductivity.

  The single-hole flow direction flow velocity measurement method based on the heating / CCD imaging method in FIG. 7B is a method for obtaining the flow direction and flow velocity by tracing the suspended matter in the observation well. Measurement is performed by the following procedure using the meter sensor 42. (1) The flow direction anemometer sensor 42 is installed in the measurement pipe 40 with the orientation adjusted at the target depth (or the depth of the fluidized bed). (2) After the disturbance of groundwater due to the instrument insertion has subsided, measure the natural groundwater temperature for about 200 seconds and check the stability of the temperature sensor. (3) After confirming that the temperature is stable, apply a constant voltage to the heater and measure for about 800 seconds. (4) The measurement is completed after measuring the voltage for about 200 seconds.

The flow rate measurement based on the electric conductivity shown in FIG. 7C is performed by the following procedure using an electric conductivity meter. (1) The electric conductivity is measured using an electric conductivity meter, and a saline solution having a value higher by about 1000 to 3000 μS / cm than that value is prepared. (2) Inject saline with a hose near the measurement depth. (3) After injecting the saline solution, the water temperature / EC sensor 43 is used to stir the solution at a depth of about 1 m above the measurement depth. (4) After confirming that the conductivity after stirring is 1000 μS / cm or more, the sensor at the measurement depth is fixed, and the electrical conductivity is self-measured.

(A) is sectional drawing of the state which the hollow tube body of the observation well unit which concerns on 1st Embodiment reached | attained the groundwater vein layer, (b) leaves a strainer member in a groundwater vein layer, and is only a hollow tube body It is sectional drawing which shows the state which pulled up to predetermined height by reverse rotation. It is explanatory drawing of the process of constructing the observation well of 1st Embodiment. (A) is sectional drawing of the state which the hollow tube body of the observation well unit which concerns on 2nd Embodiment reached | attained the groundwater vein layer, (b) leaves a strainer member in a groundwater vein layer, and is only a hollow tube body It is sectional drawing which shows the state which pulled up to predetermined height by reverse rotation. It is explanatory drawing of the process of constructing the observation well of 2nd Embodiment. (A), (b) is a schematic diagram shown about the example of observation well installation as a 1st prior art example. (A), (b) is explanatory drawing which shows 2 examples which excavate a simple measurement hole used when performing a natural water level measurement and an in-situ permeability test as a 2nd prior art example. (A) is a schematic diagram which shows an in-situ permeability test, (b) is a schematic diagram which shows a flow direction flow velocity measurement, (c) is a schematic diagram which shows the flow velocity measurement by electrical conductivity.

Explanation of symbols

1 Drilling hole
2 Strainer 3 PVC pipe
4 Filter material 5 Water-stopping material 6 Generated soil 7 Sand pool 8 Ground surface 11 PVC pipe top lid 12 Rain gutter 13 Drilling hole 14 Pipe for measurement 15 Water-impervious pipe 16 Hole bottom 17 Sand ground 18 Water-impervious section 19 Measurement section 20 Observation Well unit 21 Rotating blade 22 Lower end opening 23 Hollow tube body 24 Strainer member 25 Lower end part 26 End cut surface 27 Engagement step part 28 Stopper 29 Water passage hole 30 Cylindrical part 31 Flange part 32 Tip closing part 33 Metal network 34 Gravel layer (groundwater vein layer)
35 Lower end 36 Upper end 37 Water stop ring 38 Inner tube 39 Drilling hole 40 Pipe for measurement 41 Small-diameter pumping pipe 42 Flow direction anemometer sensor 43 Water temperature / EC sensor

Claims (10)

A strainer member is inserted into a hollow tube body provided with a rotating blade composed of a spiral blade at the lower end , and the strainer member is inserted into the hollow tube body or rotated and pressed by the strainer member. The front end opening is closed, and after burying up to the formation for groundwater intake / reduction or investigation / observation by penetration or rotational press-fitting of the hollow tube, the front end opening is reversely rotated by the hollow tube An observation well unit characterized in that formation water can flow into and out of the strainer member by opening the . A strainer member is inserted into a hollow tube body provided with a rotating blade at the lower end , and the strainer member closes the distal end opening of the hollow tube body by the strainer member when the hollow tube body penetrates or rotates. And by burying the groundwater intake / reduction or formation / inspection / observation, etc. by penetration or rotational press-fitting of the hollow tube, and then opening the tip opening by reverse rotation of the hollow tube An observation well unit characterized in that groundwater can flow into and out of the strainer member . The strainer member, perforated pipes, nets, observation wells unit according to claim 1 or 2, characterized in that it is composed of filter material or the like. The strainer member is provided so as to be able to enter and exit from the tip of the hollow tube body, and the strainer member moves to the upper limit when the hollow tube penetrates or rotates and is inserted into the hollow tube body, thereby opening the tip. After burying up to the formation where the water is taken up, reduced or surveyed, observed, etc., the strainer member is left in the formation and the hollow tube is moved upward by a predetermined length by reverse rotation. observation well unit according to claim 1 to 3, wherein any one, wherein the formation water can be inflow and outflow to the strainer member. The strainer member inserted in the hollow tube is provided with a cylindrical portion having a water passage portion and an upper end locking portion of the cylindrical portion so as to be movable through the hollow tube through a water stop ring. The observation well unit according to any one of claims 1 to 4 , wherein a lower end of the portion constitutes a closed body of an opening portion of the hollow tube body. The observation well unit according to any one of claims 1 to 5 , wherein an inner tube is inserted into the hollow tube body, and the strainer member is formed at a lower end of the inner tube. A strainer member of interpolation in the hollow tube body, the groundwater flow direction, flow velocity, flow rate, any one of claims 1 to 6, characterized in that the water temperature or water quality can be measured the measuring device is installed The observation well unit described. Observation well unit according to any one of claims 1-7 wherein the hollow tube body, characterized in that it is used as to build pumping wells for groundwater used not monitoring wells only. After rotating and injecting the hollow tube body according to any one of claims 1 to 7 into the ground and measuring the flow direction, flow velocity, flow rate, water temperature or water quality at one depth at one point, again, A well construction method that allows measurements at multiple depths by rotating the hollow tube forward while keeping the strainer part and continuing penetration. After rotating and pressing the hollow tube body according to any one of claims 1 to 7 into the ground and measuring the flow direction, flow velocity, flow rate, water temperature or water quality at one depth at one point, A method for constructing a well , wherein the hollow tube body is pulled out from the ground and moved to another place, and the hollow tube body is again placed in the ground to repeat the measurement.

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