JPH07207715A - Stratified pumping device - Google Patents

Abstract

PURPOSE:To provide a pumping device having simple constitution and the capability to pump up water from a plurality of aquifers. CONSTITUTION:A drilled hole 32 is formed, so as to penetrate an impermeable layer 1 and reach an aquifer 3 existing underneath and, then, the hole is internally divided into upper and lower sections at the position of the layer 1 via a water stop screen 34, so as to be capable of stopping water. A well tube 33 having screens 35 and 36 corresponding to each of aquifers 2 and 3 is laid, so that the screens 35 and 36 respectively come to be located at the positions of the aquifers 2 and 3. Also, ground water flowing into the tube 33 is pumped up with a lifting pump 38. In addition, the screens 35 and 36 are respectively provided with intake valves 42 and 43 for selectively causing ground water to enter the tube 33 from either thereof via remote open/close control from an operation section on the ground.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a layered pumping apparatus for individually pumping groundwater from a plurality of aquifers existing underground.

[0002]

2. Description of the Related Art When a plurality of aquifers are present in the ground, it is necessary to individually pump water from the plurality of aquifers. For example, groundwater contamination survey is performed for each aquifer. In cases such as when investigating the retained thermal energy of groundwater for each aquifer, or when it is necessary to discharge water from a specific aquifer due to ground excavation work, the conventional It was common to have multiple independent wells for each aquifer.

That is, for example, when an upper aquifer 2 and a lower aquifer 3 exist above and below the impermeable layer 1 as shown in FIG. 9, one well 4 is formed in the upper aquifer 2. In addition to being provided, another well 5 that penetrates the impermeable layer 1 and reaches the lower aquifer 3 is provided, and these wells 4 and 5 form the upper aquifer 2
From the lower aquifer 3 and separately. In addition, in each well 4 and 5 shown in FIG.
Is a well pipe installed in the drill hole 7, 8 is a screen formed at the bottom of the well pipe 6, 9 is a pump pump installed in the well pipe 6, 10 is a pump pipe, 11 is in the drill hole 7 A filter material filled around at least the screen 8 of the
Reference numeral 12 is a filler that closes the upper part of the excavation hole 7. Further, the reference numeral 13 in the well 5 reaching the lower aquifer 3 is an impermeable zone formed at the position of the impermeable layer 1 to prevent groundwater from the upper aquifer 2 from flowing into the well pipe 6. is there.

By the way, as described above, the plurality of wells 4, 5
Independently providing each aquifer 2 and 3 requires not only a high cost but also the wells 4 and 5 cannot be installed so close to each other that sufficient installation space and work space are required. Therefore, it may be not preferable, and for this reason, it is considered to adopt a layered pumping apparatus 15 as shown in FIG. 10, for example, to pump water by aquifer by one well.

In the stratified pumping apparatus 15 shown in FIG. 10, screens 16 and 17 corresponding to an upper aquifer 2 and a lower aquifer 3 are vertically arranged in an excavation hole 7 penetrating the impermeable layer 1. The well tube 18 installed in the
The filter material 11 is filled in the periphery of, and the water shield 13 is formed at the position of the impermeable layer 1. Then, the pumping pump 9 is housed in the casing 19 and disposed at the position of the impermeable layer 1, and the casing 1
A structure in which a gap between the pipe 9 and the well pipe 18 is stopped by a packer 20, and an upper valve 21 and a lower valve 22 which are opened and closed by remote control from the ground surface are attached to the upper and lower parts of the casing 19. belongs to.

In this stratified pumping apparatus 15, the upper aquifer 2
Groundwater flows into the well pipe 18 through both the filter material 11 and the screens 16 and 17 from both the lower aquifer 3 and the lower aquifer 3, but the aquifer 2 is selectively opened and closed by the upper valve 21 and the lower valve 22. , 3 is used to pump water. That is, the upper valve 21
Open and close the lower valve 22, only groundwater from the upper aquifer 2 will pass through the upper valve 21 and the casing 19
When the upper valve 21 is closed and the lower valve 22 is opened, only groundwater from the lower aquifer 3 flows into the casing 19 through the lower valve 22. It is pumped by the pumping pump 9.

[0007]

By adopting the stratified pumping apparatus 15 as described above, stratified pumping can be performed by one well, but the stratified pumping apparatus 15 is
Since the pumping pump 9 is installed in the casing 19 equipped with the packer 20 and then arranged in the well pipe 18, it has a complicated and special structure, which is costly and time-consuming to manufacture. Since there is a problem that the installation work is not easy, therefore, it has been desired to provide an effective means by which stratified pumping can be performed more easily.

[0008]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention is provided on the ground where a plurality of aquifers are present with an impermeable layer sandwiched between them, and pumps water individually from each aquifer. The stratified water pumping device of (1) above and below the excavation hole that penetrates the impermeable layer and reaches the aquifer existing therebelow so that the water can be shielded by the impermeable zone at the position of the impermeable layer. A well tube that has a length that reaches the position of the aquifer targeted for pumping in the bottom layer and has a plurality of screens vertically spaced on the sides. Arranged in the borehole so as to be the position of the water layer, in the well pipe is installed a pump for pumping groundwater that has flowed through each screen from each aquifer, and each screen has , Only from any one screen Is characterized in that water intake valve that is opened and closed by remote control from the ground in order to flow into the groundwater in the well pipe is formed by attached, respectively 択的.

In the stratified water pumping apparatus of the present invention, it may be considered that the screen has a cylindrical shape and is attached to the outside of the well pipe, or that the screen has a semi-cylindrical shape and is attached to the outside or the inside of the well pipe. Further, as the water intake valve, it is conceivable to use a ball valve that is opened and closed by a working fluid that is pressure-fed by an operation unit installed on the ground.

[0010]

The layer-by-layer pumping apparatus of the present invention is provided with a single excavation hole that reaches the lowest aquifer to be pumped, and the inside of the excavation hole is formed by the impermeable zone at the position of the impermeable layer. By partitioning vertically, only the groundwater from the aquifer above the impervious zone inflows into the borehole, and below the impervious zone below the impervious zone. Only inflow groundwater from the water layer. Then, by placing well pipes with screens at positions corresponding to the respective aquifers to be pumped in the excavation hole and selectively opening and closing water intake valves attached to the screens respectively, Only the groundwater in the aquifer is allowed to flow into the well pipe and pumped by the pump installed in the well pipe.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are stratified water pumping apparatus 31 of the first embodiment.
9 and 10, the reference numeral 1 is an impermeable layer, and 2 and 3 are an upper aquifer and a lower aquifer to be pumped, respectively.

The stratified water pumping apparatus 31 of the first embodiment is for individually pumping water from the upper aquifer 2 and the lower aquifer 3, and one well pipe 33 is arranged in the drill hole 32. It has been configured. The drill hole 32 is drilled from the surface of the earth to reach the lower aquifer 3 through the impermeable layer 1.
The inside of the impermeable layer 1 is vertically partitioned by a water impermeable belt 34 made of concrete, for example.

Further, the well pipe 33 has a length reaching the lower aquifer 3, and on its side portion, as shown in FIGS. 2 and 3, a screen 3 having a cylindrical shape, respectively.
5, 36 are provided at intervals in the vertical direction, and the screens 35, 36 are arranged in the excavation hole 32 such that they are located at the upper aquifer 2 and the lower aquifer 3. Then, at the bottom of the well pipe 33, a pump 3 for pumping the groundwater flowing in through the screen 35 or the screen 36 to the surface of the ground through the pump 37.
8 are installed. Note that reference numerals 39 and 40 are filter materials filled around the screens 35 and 36, and 41 is a filler material that closes the upper portion of the excavation hole.

Water intake valves 42 and 43 are attached to the screens 35 and 36, respectively. As shown in FIG. 4, the water intake valves 42 and 43 are a kind of ball valves in which a spherical valve body 46 in which a flow path 45 is formed is rotatably provided in a valve box 47 by a shaft 48. The intake valves 42 and 43 are the operation unit 4 installed on the surface of the earth.
It is configured to be opened / closed via the actuator 50 by a remote operation of the actuator 9.

The actuator 50 has a valve body 46 inside thereof.
Has a rotary fan (not shown) connected to the shaft 48 of the valve, and the valve body 46 is rotated by rotating the rotary fan with a working fluid (generally water is used) supplied from the operating portion 49. It is for making it. In addition, the operation unit 49 supplies a working fluid tank 51, a hand-operated (or electric) pump 52 for supplying the working fluid to the actuator 50, and the working fluid to the actuator 50 by the pump 52. Of 2
Three pipelines 53, 54 and the three-way valve 5 provided in these two pipelines 53, 54 for switching the working fluid supply route
5, 56.

In the actuator 50, the working fluid is supplied from the operating section 49 to the actuator 50 through the one conduit 53 and returned through the other conduit 54 through the path indicated by the arrow in FIG. The rotary fan rotates in one direction, which causes the valve element 46 to move 90 degrees.
The intake valves 42 and 43 are opened by being rotated once. In addition, the three-way valves 55 and 56 are operated to switch the supply path of the working fluid, and the working fluid is supplied to the other conduit 54.
The rotary fan rotates in the direction opposite to the above by supplying the gas through the pipe and returning it through the one conduit 53, thereby rotating the valve body 46 by 90 degrees in the opposite direction to close the intake valve. Has become.

In the stratified pumping apparatus 31 having the above structure, the intake valves 42 and 43 attached to the screens 35 and 36 are selectively opened / closed to pump water from the upper aquifer 2 and the lower aquifer 2. The pumping from 3 can be freely switched. That is, since the inside of the excavation hole 32 is vertically partitioned by the water shield 34 at the position of the impermeable layer 1, the intake valve 42 attached to the upper screen 35 is opened and the lower screen 36 is attached. When the intake valve 43 is closed, only the groundwater of the upper aquifer 2 flows into the well pipe 33 through the screen 35 and the intake valve 42, and the groundwater of the lower aquifer 3 is changed to the well pipe 33.
It does not flow in. Conversely, the upper screen 35
If the intake valve 42 attached to the bottom is closed and the intake valve 43 attached to the lower screen 36 is opened, only the groundwater of the lower aquifer 3 flows into the well pipe 33 through the screen 36 and the intake valve 43. The groundwater of the upper aquifer 2 never flows into the well pipe 33. Therefore, according to the present apparatus 31, the water can be individually pumped from the desired aquifers 2 and 3 only by selectively opening and closing the water intake valves 42 and 43.

Further, in this stratified water pumping device 31, since one well pipe 33 is arranged in a single drill hole 32, as shown in FIG. 9, each aquifer 2, 3 is independent. Compared with the case where the two wells 4 and 5 are provided, although the diameter of the drill hole 32 needs to be slightly increased as much as the screens 35 and 36 are provided, the construction cost can be sufficiently reduced as a whole. This has the advantage that the installation space and the work space can be saved as well as being achieved. Further, as compared with the conventional layered pumping apparatus 15 as shown in FIG. 10, since the casing 19 provided with the packer 20 is not required, the structure can be simplified, so that the cost can be reduced and the manufacturing time can be reduced. There is no need for it, and the construction procedure at the site does not become complicated.

Further, in the above device 31, the water intake valve 42,
Since a kind of ball valve having a simple structure is adopted as 43, there are advantages that there are few failures, excellent reliability, and that opening and closing operations are extremely simple.

5 and 6 show a stratified water pumping apparatus 61 which is another embodiment of the present invention. This is because the screens 62 and 63 have a semi-cylindrical shape and are
The point that the screens 62 and 63 are attached to the outside is different from that of the first embodiment, and the projected size of the screens 62 and 63 to the outside is smaller than that of the first embodiment. 7 and 8 show a layered pumping apparatus 71 which is still another embodiment. In this case, the semi-cylindrical screen 7 is used.
The screens 72 and 73 are prevented from protruding to the outside of the well pipe 74 by incorporating 2, 73 into the well pipe 74. According to the devices 61 and 71 of these embodiments, the cylindrical screens 35 and 36 as in the first embodiment are used.
Although the surface area of the screens 62, 63 and the screens 72, 73 (that is, the area where water can be collected) is slightly smaller than that in the case of using, the same effect can be obtained.
There is an advantage that the diameter of the excavation hole 32 can be reduced as compared with the case of the first embodiment.

Since the above embodiment is an example in which the upper aquifer 2 and the lower aquifer 3 are pumped up, the two aquifers 2 corresponding to the upper aquifer 2 and the lower aquifer 3 are taken as examples. Although only the screen is provided, it can be similarly applied to a case where a larger number of aquifers are to be pumped up. For example, when pumping water from three aquifers that sandwich two impermeable layers, the impermeable belts 3 are respectively placed at the positions of the impermeable layers.
It is only necessary to partition the inside of the excavation hole 32 into three parts by providing 4, and to provide screens at the positions of these three aquifers, respectively, and to equip all of these screens with intake valves. The same applies when pumping more than three aquifers. Further, the water intake valve is not limited to the valve of the above embodiment, and any other type can be arbitrarily adopted as long as it can be opened and closed from the surface of the earth.

[0022]

As described above, the layer-by-layer pumping apparatus of the present invention divides the inside of an excavation hole into upper and lower parts by a water-impervious zone at the position of the impermeable layer so that water can be pumped into the excavation hole. A plurality of screens corresponding to the target aquifer are provided at upper and lower intervals, and each screen is equipped with a well pipe with an intake valve that is opened and closed by remote control from the surface of the earth. In addition, since a pump is installed in the well pipe for pumping groundwater that has flowed in from each aquifer through each screen, it is possible to operate multiple wells by operating the intake valve. It can be pumped individually from the water layer,
Therefore, it is possible to reduce the construction cost as compared with the case where multiple independent wells are provided for each aquifer, and the case where a complicated and special stratified water pumping device that requires a packer is used. This has the effect of saving the installation space and work space.

[Brief description of drawings]

FIG. 1 is a sectional view showing a schematic configuration of a stratified water pumping apparatus according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a schematic configuration of a well tube provided with a screen in the same device.

FIG. 3 is a cross-sectional view showing a schematic configuration of a well tube provided with a screen in the same device.

FIG. 4 is a schematic configuration diagram showing a water intake valve and its operating portion in the same apparatus.

FIG. 5 is a perspective view showing a schematic configuration of a well pipe provided with a screen in a layered water pumping apparatus which is another embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a schematic configuration of a well tube provided with a screen in the same device.

FIG. 7 is a perspective view showing a schematic configuration of a well pipe provided with a screen in a layered water pumping apparatus which is still another embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a schematic configuration of a well tube provided with a screen in the same device.

FIG. 9 is a cross-sectional view showing an example of installation of wells when pumping water layer by layer in the related art.

FIG. 10 is a cross-sectional view showing a conventional example of a layered water pumping device.

[Explanation of symbols]

 1 Impermeable Layer 2 Upper Aquifer (Aquifer) 3 Lower Aquifer (Aquifer) 31 Layer-wise Water Pumping Equipment 32 Drilling Hole 33 Well Pipe 34 Impermeable Zone 35, 36 Screen 37 Pumping Pipe 38 Pumping Pump 42 , 43 Water intake valve 49 Operation part 50 Actuator 61 Layered water pumping device 62, 63 Screen 64 Well pipe 71 Layered water pumping device 72, 73 Screen 74 Well pipe.

Claims (5)

[Claims] 1. A stratified water pumping apparatus for individually pumping water from each aquifer, which is provided on the ground where a plurality of aquifers are sandwiched by impermeable layers. The excavation hole that penetrates through to reach the aquifer existing below it is partitioned by the impervious layer at the position of the impermeable layer so that it can be impermeable and the lowest aquifer to be pumped. The length of the well pipe, which has a length reaching the position of 1, and is provided with a plurality of screens at intervals vertically on the side, so that each screen is located at the position of the aquifer to be pumped. And a pump for pumping groundwater flowing from each aquifer through each screen is installed in the well pipe, and each of the screens selectively receives groundwater from only one screen. It should flow into the well pipe. Stratification pumping apparatus characterized by water intake valve that is opened and closed by remote control, which are attached respectively from the surface. 2. The layered water pumping apparatus according to claim 1, wherein the screen has a cylindrical shape and is positioned outside the well pipe. 3. The layered water pumping apparatus according to claim 1, wherein the screen has a semi-cylindrical shape and is located outside the well pipe. 4. The stratified water pumping apparatus according to claim 1, wherein the screen has a semi-cylindrical shape and is installed inside the well pipe. 5. The stratification according to claim 1, wherein the water intake valve is a ball valve that is opened and closed by a working fluid that is pressure-fed from an operation unit installed on the surface of the earth. Pumping equipment.