JP3303148B2 - Recharge 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 recharging method used for excavation work and the like and a recharging device used for the method.

[0002]

2. Description of the Related Art As is well known, a recharging method is employed in excavation work in order to prevent a decrease in groundwater head and ground subsidence around a site or to reduce sewerage usage fees. is there. Here, the recharge method is a method in which groundwater pumped from a deep well is directly returned to the ground from a recharge well (injection well).

[0003]

However, in the conventional recharging method, groundwater pumped from a deep well is constantly supplied to an injection well, and water is injected into the ground from a screen provided at a lower end of the injection well. After a certain period of time has elapsed since the start of water injection, the screen gradually clogged, the ground was excessively tightened, fine particles moved, and the groundwater injected from the injection well A phenomenon occurs in which the fine particles accumulate at a position that is a predetermined distance away from the injection well where the flow velocity is the movement limit flow velocity of the fine particles. This accumulation of fine particles reduces the flow rate of groundwater, increases the pressure in the injection well, creates a vicious cycle in which the ground is tightened and the injection capacity of the injection well decreases, and as shown in the graph of FIG. There is a problem that the water level gradually rises, and furthermore, if water injection is continued, groundwater overflows from the injection well.

The present invention has been made in view of the above circumstances, and has as its object to provide a recharge device capable of maintaining a substantially constant water injection capacity for a long period of time.

[0005]

[0006]

[0007]

According to a first aspect of the present invention, there is provided a recharging apparatus, comprising a partition member for vertically partitioning a water injection well at an intermediate portion of the water injection well, and connecting the upper and lower sides of the water well to the partition member. A communication passage is provided, and a valve mechanism for intermittently opening and closing the communication passage is provided in the communication passage.

According to a second aspect of the present invention, in the recharge device according to the first aspect , the valve mechanism opens when the pressure on the upstream side of the valve mechanism becomes larger than a predetermined value. It is characterized by the following.

According to a third aspect of the present invention, there is provided the recharge device according to the first aspect , wherein the valve mechanism is opened as the water level rises above the partition member, and the valve mechanism is turned on when the water level falls. It is characterized in that the valve is in a closed state accordingly.

According to a fourth aspect of the present invention, in the recharge device according to the third aspect , the valve mechanism is connected to the communication passage, and the valve mechanism is connected to a bent passage filled with air blocking the communication passage. It is characterized by comprising.

According to a fifth aspect of the present invention, in the recharge device according to the third aspect , the valve mechanism is filled with a gas therein, and is urged in a direction to close the communication passage by a pressure of the gas. It is characterized by being constituted by a film body formed.

According to a sixth aspect of the present invention, in the recharge device according to the third aspect , a detecting means for detecting a water level above the partition member and the valve when the water level by the detecting means is high. And control means for driving the mechanism to an open state and driving the valve mechanism to a closed state when the water level detected by the detection means is low.

[0013]

[0014]

[0015]

According to the recharge device according to the first aspect of the present invention, a communication passage is provided in a partition member for vertically partitioning a water injection well, and a valve mechanism interposed in the communication passage is intermittently opened and closed. Groundwater is intermittently injected into the ground.
Therefore, when the flow rate becomes zero, the movement of the fine particles is stopped and returned to the original position, and the movement of the fine particles is prevented to a certain degree or more. The clogging due to the attached floating substance in the water is prevented, the groundwater can be smoothly injected into the ground, and the phenomenon that the groundwater overflows from the injection well can be prevented.

In the recharge device according to the second aspect of the present invention, the groundwater can be intermittently injected into the ground through the communication passage by changing the pressure on the upstream side of the valve mechanism. Therefore, when the flow rate becomes zero, the movement of the fine particles is stopped and returned to the original position, and the movement of the fine particles is prevented to a certain degree or more. The clogging due to the attached floating substance in the water is prevented, the groundwater can be smoothly injected into the ground, and the phenomenon that the groundwater overflows from the injection well can be prevented.

According to a third aspect of the present invention, when the water level above the partition member rises, the valve mechanism is opened, and the groundwater above the partition member is injected into the ground through the communication passage. When the water level above the partition member drops according to this injection, the valve mechanism is closed, the injection of groundwater is stopped, and the groundwater is stored again above the partition member. Thus, groundwater is automatically and intermittently injected into the ground by supplying groundwater above the partition member. Therefore, when the flow rate becomes zero, the movement of the fine particles is stopped and returned to the original position, and the movement of the fine particles is prevented to a certain degree or more. The clogging due to the attached floating substance in the water is prevented, the groundwater can be smoothly injected into the ground, and the phenomenon that the groundwater overflows from the injection well can be prevented.

According to the recharging device of the fourth aspect of the present invention, when the water level above the partition member rises, the water level of the groundwater in contact with the air blocking the communication passage rises and pushes the air away. When the water flows below the partition member and is injected into the ground, and the water level above the partition member drops in accordance with the injection, the water level of the groundwater in contact with the air filled in the bent passage decreases, and the water is again communicated with the air. The passage is shut off and groundwater injection is stopped. Thus, groundwater is automatically and intermittently injected into the ground by supplying groundwater above the partition member. Therefore, when the flow rate becomes zero, the movement of the fine particles is stopped, and it is prevented that the fine particles move more than a certain degree by returning to the original state,
Partial excessive tightening of the ground, movement of fine particles, and clogging due to suspended substances in the water adhering to the screen are prevented, groundwater can be smoothly injected into the ground, and groundwater overflows from the injection well. It is possible to prevent such a phenomenon.

According to the recharge device according to the fifth aspect of the present invention, when the water level above the partition member rises, the water pressure of the groundwater in the membrane portion of the valve mechanism increases, and the gas sealed in the membrane is compressed. As a result, the membrane is deformed in the direction opposite to the biasing direction, the communication passage is opened, and the groundwater above the partition member flows below the partition member through the communication passage and is injected into the ground, and the partition is performed according to the injection. When the water level above the member drops, the water pressure of the groundwater in the membrane decreases, and the pressure of the gas sealed in the membrane displaces the membrane in the direction of blocking the communication passage, and the communication passage is blocked by the membrane, and the groundwater Is stopped. Thus, groundwater is automatically and intermittently injected into the ground by supplying groundwater above the partition member. Therefore, when the flow rate becomes zero, the movement of the fine particles is stopped and returned to the original position, and the movement of the fine particles is prevented to a certain degree or more. The clogging due to the attached floating substance in the water is prevented, the groundwater can be smoothly injected into the ground, and the phenomenon that the groundwater overflows from the injection well can be prevented.

According to the recharging device according to claim 6 of the present invention, when it is detected high above the water level than the partition member by the detection means, the valve mechanism is operated in the opening state by the control unit partition When the groundwater above the member is injected into the ground through the communication passage and the detecting means detects that the water level above the partition member is lower, the valve mechanism is driven to the closed state by the control means and the partition is driven. The injection of groundwater above the member into the ground is stopped. Thus, groundwater is automatically and intermittently injected into the ground by supplying groundwater above the partition member. Therefore, when the flow rate becomes zero, the movement of the fine particles is stopped and returned to the original position, and the movement of the fine particles is prevented to a certain degree or more. The clogging due to the attached floating substance in the water is prevented, the groundwater can be smoothly injected into the ground, and the phenomenon that the groundwater overflows from the injection well can be prevented.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A recharge device according to one embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the recharge device of this embodiment supplies groundwater pumped from a deep well 1 to an injection well 2 and returns the groundwater from a lower portion of the injection well 2 into the ground.

In the middle of the well 2 in the height direction, the well 2
(Corresponding to a partitioning member) 3 for vertically partitioning the sheet. Inside the packer 3, a communication passage 4 that connects the upper part 2 a and the lower part 2 b of the injection well 2 is provided. As shown in FIG. 2, a bent passage (corresponding to a valve mechanism) 5 is connected to the communication passage 4. Inside the bent passage 5, air 6 for shutting off the vertically connected communication passage 4.
Are filled. The screen 7 is attached to the lower part 2b of the water injection well 2.

Next, the operation of the recharge device of this embodiment will be described, and the recharge method of one embodiment of the present invention will be described.

The groundwater pumped from the deep well 1 at a constant flow rate is supplied into the injection well 2. The water injection well 2 is vertically partitioned by the packer 3, and the air passage 6 is filled with the air 6 in the bent passage 5 connected to the communication passage 4 provided in the packer 3, so that the communication passage 4 is blocked. Groundwater is stored in the upper part 2a of the water injection well 2, and the water level of the upper part 2a gradually rises upward from the position indicated by the dotted line in FIG.
Along with this, the water pressure at the position in contact with the air 6 filled in the bent passage 5 rises, the air 6 is compressed, the water level in the bent passage 5 rises, overflows, and is connected to the bent passage 5. The water flows into the lower communication passage 4 and the groundwater is reduced into the ground through the screen 7 provided below the water injection well 2.

Then, from the upper part 2a to the lower part 2b of the injection well 2
, The water level in the upper part 2a drops to the position shown by the dotted line in FIG. Along with this, the water pressure at the position in contact with the air 6 filled in the bent passage 5 decreases, the air 6 expands, and the water level in the bent passage 5 decreases,
The communication passage 4 is again shut off by the air 6, and the inflow of groundwater from the upper part 2 a to the lower part 2 b of the injection well 2 is stopped.

As described above, by supplying a constant flow of groundwater from the deep well 1 to the injection well 2, the groundwater can be intermittently injected into the ground. That is, since the flow rate of the groundwater injected into the ground changes intermittently, when the flow rate becomes zero, the movement of the fine particles is stopped and returned to the original state.
As a result, partial excessive tightening of the ground, movement of fine particles, and clogging due to suspended substances in the water adhering to the screen are prevented, and groundwater can be smoothly injected into the ground. The phenomenon that groundwater overflows can be prevented. As shown in FIG. 3, the recharge device according to the embodiment of the present invention has an effect that the water level of the injection well can be kept low for a long time as compared with a conventional device in which a constant flow rate of groundwater is injected.

FIG. 4 shows a recharge device according to another embodiment of the present invention. In the recharge device shown in FIGS. 1 and 2, an air pocket 8 is formed at the boundary between the bent passage 5 and the lower communication passage 4.

When the water level at the top of the injection well 2 rises as in the above embodiment, the water level of the groundwater in the bent passage 5 rises as shown by the dotted line in FIG. I do. At this time, the air 6 filled in the bent passage 5 is accumulated in the air pool 8 and is prevented from flowing into the lower communication passage 4 together with the groundwater.

FIG. 5 shows a recharge device according to still another embodiment of the present invention. In this embodiment, a valve mechanism 10 is provided instead of the bent passage shown in FIGS. In the valve mechanism 10, the communication passage 4 is shut off by a donut-shaped film body 11 in which a gas, for example, air is sealed, and an inner peripheral portion of the film body 11 is sealed in the inside. Are urged in a direction in which they come into contact with each other.

When the water level at the top of the injection well 2 rises as in the above embodiment, the water pressure of the groundwater in the bent passage 5 rises and becomes higher than the pressure of the gas sealed in the membranes 11 and 12. Then, the film bodies 11 and 12 are displaced in a direction away from each other as shown by a dotted line in FIG. Groundwater flows in. At this time, since the gas sealed in the membranes 11 and 12 does not come into contact with the groundwater, even if the pressure of the sealed gas increases, the gas dissolves in the groundwater and flows down to the communication passage 4. Can be prevented.

FIG. 6 shows a recharge device according to still another embodiment of the present invention. The valve mechanism 15 opens between the upper communication passage 4 and the lower communication passage 4 when the water pressure in the upper communication passage 4 becomes larger than a predetermined value.
Is interposed.

In this embodiment, as in the previous embodiment, when the water level in the upper part of the injection well 2 rises, the water pressure in the communication passage 4 rises. Underground water flows into the communication passage 4 of the vehicle. Further, in the present embodiment, since the existing valve mechanism 15 can be used, a recharge device can be obtained at low cost.

FIG. 7 shows a recharge device according to still another embodiment of the present invention.

In this embodiment, a communication passage 4 for connecting the upper part 2a and the lower part 2b of the water injection well 2 is formed in a packer 3 for partitioning the water injection well 2 up and down, as in the above embodiment. Is provided with a valve mechanism 20. This valve mechanism 2
0 has a configuration similar to that of the valve mechanism shown in FIG.
A film body 21 and a film body 22 are provided to face each other,
The membranes 21 and 22 are deformed by the pressure in the chamber 23 provided on the back side of the communication passages 1 and 22 to block the communication passage 4. A compressor 25 is connected to the chamber 23 via an electromagnetic valve 24. In addition, upper part 2a of injection well 2
Are provided with level switches (detection means) 26 and 27 for detecting the level of groundwater. Level switch 26
Is for detecting when the groundwater level is high, and the level switch 27 is for detecting when the groundwater level is low. When the level switch 27 detects that the level of the groundwater is low, the solenoid valve 24 is switched to introduce compressed air from the compressor 25 into the chamber 23, and
2 is displaced in a direction to shut off the communication passage 4, and when the level switch 26 detects that the groundwater level is high, the solenoid valve 24 is switched to discharge the compressed air in the chamber 23, and the membrane 21, Control means (not shown) for displacing 22 in a direction to open communication passage 4 is provided.

According to the recharging device of this embodiment, when the water level in the upper part 2a of the injection well 2 is high, the valve mechanism 20 is opened, and the groundwater is passed through the communication passage 4 to the lower part 2b of the injection well 2. And injected into the ground.
When the water level of a is low, the valve mechanism 20 is closed.
The communication passage 4 is shut off to stop the injection of groundwater into the ground.

[0037]

[0038]

[0039]

[0040]

As described above, according to the first aspect of the present invention,
According to the recharge device described above, a partition member for vertically partitioning the injection well is provided in the middle part of the injection well, a communication passage communicating the upper and lower sides of the injection well is provided in the partition member, and the communication passage is intermittently connected to the communication passage. Since the valve mechanism that opens and closes is provided, the movement of fine particles is stopped when the flow rate becomes zero, and it is prevented from moving more than a certain amount by returning to the original position. Tightening, movement of fine particles, and clogging due to floating substances in the water adhering to the screen are prevented, and groundwater can be smoothly injected into the ground.
The phenomenon that groundwater overflows from the injection well can be prevented.

According to a second aspect of the present invention, in the first aspect , the valve mechanism is opened when the pressure on the upstream side of the valve mechanism becomes larger than a predetermined value. Because of the valve, groundwater can be intermittently injected into the ground through the communication passage. Therefore, when the flow rate becomes zero, the movement of the fine particles is stopped, and it is prevented that the fine particles move more than a certain degree by returning to the original state,
Partial excessive tightening of the ground, movement of fine particles, and clogging due to suspended substances in the water adhering to the screen are prevented, groundwater can be smoothly injected into the ground, and groundwater overflows from the injection well. It is possible to prevent such a phenomenon.

According to the recharging device of claim 3, wherein the [0042] present invention, the recharging device according to claim 1, wherein the valve mechanism, of the water level in an open valve state with increasing above the water level than the partition member Since the valve is configured to be in a valve-closed state as it descends, groundwater can be automatically and intermittently injected into the ground by supplying groundwater above the partition member. Therefore, when the flow rate becomes zero, the movement of the fine particles is stopped and returned to the original position, and the movement of the fine particles is prevented to a certain degree or more. The clogging due to the attached floating substance in the water is prevented, the groundwater can be smoothly injected into the ground, and the phenomenon that the groundwater overflows from the injection well can be prevented.

According to the recharge device according to the fourth aspect of the present invention, in the recharge device according to the third aspect , the valve mechanism is connected to the communication passage, and the valve mechanism is filled with air that blocks the communication passage. Because it was composed of aisles,
By supplying groundwater above the partition member, groundwater can be automatically and intermittently injected into the ground. Therefore, when the flow rate becomes zero, the movement of the fine particles is stopped and returned to the original position, and the movement of the fine particles is prevented to a certain degree or more. Prevention of clogging caused by suspended substances in the attached water, smooth infusion of groundwater into the ground,
The phenomenon that groundwater overflows from the injection well can be prevented.

According to a fifth aspect of the present invention, in the recharge device according to the third aspect , the valve mechanism is filled with a gas therein, and is urged in a direction to close the communication passage by a pressure of the gas. The ground water can be automatically and intermittently injected into the ground by supplying ground water above the partition member. Therefore, when the flow rate becomes zero, the movement of the fine particles is stopped and returned to the original position, and the movement of the fine particles is prevented to a certain degree or more. The clogging due to the attached floating substance in the water is prevented, the groundwater can be smoothly injected into the ground, and the phenomenon that the groundwater overflows from the injection well can be prevented.

According to a sixth aspect of the present invention, in the recharge device according to the third aspect , a detecting means for detecting a water level above the partition member and the valve when the water level by the detecting means is high. Control means for driving the mechanism to the open state and driving the valve mechanism to the closed state when the water level detected by the detection means is low is provided, so that the groundwater is automatically supplied by supplying groundwater above the partition member. Groundwater can be intermittently injected into the ground. Therefore, when the flow rate becomes zero, the movement of the fine particles is stopped and returned to the original position, and the movement of the fine particles is prevented to a certain degree or more. The clogging due to the attached floating substance in the water is prevented, the groundwater can be smoothly injected into the ground, and the phenomenon that the groundwater overflows from the injection well can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a recharge device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a main part of the recharge device of FIG. 1;

FIG. 3 is a graph showing a change over time in the water level of an injection well between the conventional recharge device and the recharge device according to the embodiment of the present invention shown in FIG.

FIG. 4 is a diagram showing a recharge device according to another embodiment of the present invention.

FIG. 5 is a diagram showing a recharge device according to still another embodiment of the present invention.

FIG. 6 is a diagram showing a recharge device according to still another embodiment of the present invention.

FIG. 7 is a diagram showing a recharge device according to still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Deep well 2 Injection well 2a Upper part 2b Lower part 3 Packer 4 Communication passage 5 Bend passage 8 Air pocket 10 Valve mechanism 11,12 Membrane 15 Valve mechanism 20 Valve mechanism 24 Solenoid valve 26,27 Level switch (detection means)

Claims (6)

(57) [Claims] 1. A partition member for vertically partitioning an injection well is provided at an intermediate portion of the injection well, a communication passage connecting the upper and lower sides of the injection well is provided in the partition member, and the communication passage is intermittently opened and closed in the communication passage. A recharging device, comprising a valve mechanism that performs a recharging operation. 2. The recharge device according to claim 1 , wherein the valve mechanism opens when the pressure on the upstream side of the valve mechanism becomes larger than a predetermined value. Wherein the valve mechanism, characterized in that the partition member with increasing above the water level in an open valve state along with the lowering of the water level is configured to be closed claims
2. The recharge device according to 1 . 4. The recharging device according to claim 3 , wherein the valve mechanism is constituted by a bent passage which is connected to the communication passage and is filled with air for blocking the communication passage. 5. The valve mechanism, wherein a gas is sealed inside,
4. The recharge device according to claim 3 , wherein the recharge device is constituted by a film urged in a direction to close the communication passage by the pressure of the gas. 6. A detecting means for detecting a water level above the partition member, and the valve mechanism is driven to an open state when the water level by the detecting means is high, and the valve is opened when the water level by the detecting means is low. 4. The recharge device according to claim 3, further comprising control means for driving the mechanism to a closed state.