JP3455869B2 - Pumping equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to pumping groundwater from an aquifer existing in the ground, The present invention relates to a pumping apparatus used when pouring groundwater taken from a river into another aquifer. 2. Description of the Related Art Conventionally, in the ground where a plurality of aquifers exist, for example, groundwater treatment accompanying ground excavation work, groundwater contamination investigation, investigation of groundwater retained thermal energy, etc. A pumping device for pumping groundwater from a predetermined aquifer is used. In such a pumping device, ground subsidence may occur due to pumping of groundwater, and the cost of treating the pumped groundwater is also high.Therefore, not only a simple pumping function but also groundwater drawn from a predetermined aquifer is required. Some have a water injection function of injecting water into another aquifer. [0003] For example, as shown in FIG. 7, an aquifer 2 (hereinafter referred to as an intake layer) and an aquifer to be injected (hereinafter referred to as an "aquifer") are provided above and below an impermeable layer 1 underground. Layer)
3, the pumping device 4 is installed inside the excavation hole 5 formed to reach the water injection layer 3. The pumping device 4 has a well pipe 8 provided with a water intake screen 6 and a water injection screen 7 at positions corresponding to the water intake layer 2 and the water injection layer 3, respectively, and a well pipe 8 provided at the position of the water impermeable layer 1. A water-blocking zone 9 that blocks the water intake layer 2 and the water-injection layer 3 outside of the tub, a packer 10 that is also arranged at the position of the water-impermeable layer 1 and partitions the space inside the well pipe 8 up and down, and A flow pipe 11 penetrating therethrough, a pump chamber 12 connected to a lower end of the flow pipe 11, and a pump 14 installed in the pump chamber 12 and pumping water to the ground through a water pump pipe 13.
And Further, a water intake valve 15 is provided at the upper end of the flow pipe 11, a water injection layer cleaning valve 16 is provided in the pump chamber,
The pumping pipe 13 located below the packer 10 is provided with a water injection valve 17, and the pumping pipe 13 exposed above the ground is provided with a gate valve 18. [0005] In the pumping apparatus 4 configured as described above, when water is injected from the water intake layer 2 to the water injection layer 3, FIG.
Open the water intake valve 15 and the water injection valve 17 as shown in
When the pump 14 is operated with the water injection layer cleaning valve 16 and the gate valve 18 closed, the groundwater staying in the water intake layer 2 flows into the upper space in the well pipe 8 through the water intake screen 6 and further flows from the water intake valve 15. It flows into the pump chamber 12 through the pipe 11. Then, the water is fed from the water injection valve 17 into the lower space in the well pipe 8 by the pump 14, and injected into the water injection layer 3 through the water injection screen 7. Further, in the case of pumping water from the water injection layer 3 and washing the water injection screen 7 in the reverse direction (backwashing), the water injection layer cleaning valve 16 and the gate valve 18 are opened as shown in FIG. When the pump 14 is operated with the water injection valve 17 closed, the groundwater remaining in the water injection layer 3 flows through the water injection screen 7 in the reverse direction, and the well pipe 8
Into the lower space of the inside, and furthermore, a valve 1 for washing the injection layer
6 flows into the pump chamber 12. Then, the water is sent out to the ground through the pumping pipe 13 by the pump 14 and pumped. [0007] In the above-mentioned pumping apparatus, if a device such as a pump breaks down, the packer must be deflated, separated from the well pipe and pulled up to the ground before the pump is lifted from the ground. Cannot be lifted. However, when the packer is pulled up, the intake layer and the water injection layer will be in communication with each other in the well pipe, and the groundwater remaining in the water injection layer will flow into the intake layer, and groundwater treatment and various types of ground excavation work There is a problem that the water level is increased by increasing the water volume of the intake layer, which had been lowered for the purpose of investigation. This problem can also occur if the packer breaks down. The present invention has been made in view of the above circumstances, and even if equipment such as a pump is pulled out of a well pipe, the water level is lowered for groundwater treatment and various investigations associated with ground excavation work. The purpose is to prevent problems such as a rise in the water level of the intake layer. SUMMARY OF THE INVENTION [0009] The present invention is directed to a method in which a plurality of aquifers are provided on the ground with an impermeable layer interposed therebetween, and water is separately pumped from each aquifer. A pumping device for injecting groundwater withdrawn from a predetermined aquifer into another aquifer, wherein the excavation penetrates through the impermeable layer into the ground and reaches the aquifer located thereunder. A hole is formed, and in the borehole, a water-blocking zone that partitions the drilling hole up and down at the position of the water-impermeable layer to block water, and a screen penetrating the water-blocking zone and corresponding to each aquifer. A well and a packer for partitioning the space inside the well pipe up and down at the position of the water-impermeable layer to block water, and an aquifer located alongside the packer and positioned above the well pipe Pump that injects water into the lower aquifer and pumps water from the lower aquifer A mechanism and a groundwater flow path disposed below the pump mechanism. When the packer is taken out of the well pipe to the ground, the flow path is closed to replace the packer and partition the space in the well pipe up and down. It is characterized by having a water impervious board for water. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a water pump according to the present invention will be described. Here, a description will be given of a water pumping apparatus in a case where the water intake layer 2 and the water injection layer 3 exist above and below the underground impermeable layer 1. The pumping device 20 shown in FIG. 1 is installed inside a borehole 5 formed so as to reach the water injection layer 3, and is located at a position corresponding to the water intake layer 2 and the water injection layer 3, respectively. And a well pipe 8 provided with a water injection screen 7, a water barrier 9 disposed at the position of the water impervious layer 1 and blocking the water intake layer 2 and the water injection layer 3 outside the well pipe 8, and a water impervious layer 1 , A packer 10 vertically dividing the space in the well pipe 8, a flow pipe 11 penetrating vertically through the packer 10, and a pump chamber 1 connected to a lower end of the flow pipe 11.
2 and a pump 14 installed in the pump room 12 for pumping water to the ground through a pumping pipe 13. Furthermore, a water intake valve 15 is provided at the upper end of the flow pipe 11, a water injection layer cleaning valve 16 is provided in the pump chamber, a water injection valve 17 is provided in the water supply pipe 13 located below the packer 10, and a water supply pipe exposed above the ground. 13 has a gate valve 18 respectively. Further, the pumping device 20 is disposed in the cross-sectional direction of the well pipe 8 below a pump mechanism 21 mainly including the pump chamber 12 and the pump 14 installed in the well pipe 8 so as to form an internal space. Is provided with a water-shielding panel 22 that vertically separates the water. The water shield plate 22 is provided with a check valve 23 for passing water only when water is introduced from above, and a water passing valve 24 for opening and closing the water by remote control from the ground. I have. Although not shown, each of the water intake valve 15, the water injection layer cleaning valve 16, and the water injection valve 17 is also opened and closed by remote control from the ground. In the pumping apparatus 20 configured as described above, when water is injected from the water intake layer 2 to the water injection layer 3, as shown in FIG. 2, the water intake valve 15 and the water injection valve 17 are opened by remote control, When the pump 14 is operated with the injection layer cleaning valve 16, the gate valve 17, and the water flow valve 24 closed, the groundwater retained in the intake layer 2 flows into the well pipe 8 through the intake screen 6,
The water is supplied from the intake valve 21 to the upper space of the well pipe partitioned by the packer. When the pump is operated here, the groundwater staying in the water intake layer 2 flows into the upper space in the well pipe 8 through the water intake screen 6, and further flows into the water intake valve 15.
Flows into the pump chamber 12 through the flow pipe 11. Then, the water is fed from the water injection valve 17 into the lower space in the well pipe 8 by the pump 14, further passes through the check valve 22 from the check valve 23, and is injected into the water injection layer 3 through the water injection screen 7. When pumping water from the pouring layer 3 and washing (backwashing) the pouring screen 7 in the reverse direction, as shown in FIG. 3, the pouring layer cleaning valve 16 and the gate valve 18 are remotely operated.
When the pump 14 is operated with the water supply valve 24 opened and the water intake valve 15 and the water injection valve 17 closed, the groundwater staying in the water injection layer 3 flows through the water injection screen 7 in the reverse direction and flows into the well pipe 8. Flows into the lower space. At this time, fine particles and the like caught on the inside of the water injection screen 7 are washed away, and clogging is removed. The groundwater flowing into the lower space in the well pipe 8 passes through the water blocking valve 22 from the water flow valve 24 and further flows into the pump room 12 from the injection layer cleaning valve 16, and is sent out to the ground through the water pumping pipe 13 by the pump 14 to be pumped. Is done. FIG. 4 shows a measure to be taken when a device such as the pump 14 fails. In this case, first, the water flow valve 2
After closing 4, the flow of the groundwater between the water intake layer 2 and the water injection layer 3 is blocked by the water shield 22, the packer 10 is deflated, and the pump mechanism 21 is separated from the well pipe 8 and pulled up.
The crane 30 is used for the lifting operation, and the lifting pipe 13 is lifted up. FIG. 5 shows a method of cleaning the water injection screen 7 with the pump mechanism 21 raised. This washing method is called swabbing.
A steel pipe 41 having a packer 40 is installed therein, and the packer 40 is expanded and fixed at a position corresponding to the water-impermeable layer 1. Inside the steel pipe 40, a swab ball 42 that slides in the pipe and moves up and down is suspended by a crane 43 and supported. When the swab ball 42 is gradually pulled upward with the water valve 24 open, the inside of the steel pipe 40 is vertically divided by the swab ball 42, and the flow of groundwater is cut off. Because the swab ball 42 moves upward, the water pressure in the space below the swab ball 42 decreases, and the groundwater staying in the water injection layer 3 flows through the water injection screen 7 in the opposite direction and flows into the well pipe 8. . At this time, fine particles and the like caught on the inside of the water injection screen 7 are washed away, and clogging is removed. According to the water pumping apparatus 20 configured as described above, when the packer 10 is deflated and the pump mechanism 21 is taken out from the well pipe 8 to the ground, the water passage valve 2 of the water shield plate 22 is used.
By closing the packing 4, the space inside the well pipe 8 can be shielded by water instead of the packer 10, so that the groundwater staying in the water injection layer 3 is prevented from flowing into the intake layer 2 while the packer 10 is closed. And the replacement of the pump mechanism 21 and the like can be easily performed. Further, even if the function of the packer 10 is deteriorated or damaged, the same measures can be taken to prevent the groundwater staying in the water injection layer 3 from flowing into the intake layer 2. Accordingly, a problem such as a rise in the water level of the intake layer, which had been lowered for groundwater treatment and various investigations accompanying the ground excavation work, does not occur, and the work can be continuously performed without interruption. Incidentally, as shown in FIG.
If a water guide pipe 51 provided with a screen 50 at the tip reaching the water injection screen 7 is provided below the water supply screen 7, water can be pumped near the water injection screen 7 when the water injection screen 7 is washed, and further effects can be expected. As described above, the pumping apparatus of the present invention is provided with a water blocking board having a groundwater flow path in a well pipe, and is used when removing a packer and a pump mechanism from the well pipe to the ground. It is possible to close the flow channel and block the space inside the well pipe instead of the packer, so that the groundwater staying in the injection layer does not flow into the intake layer,
Exchange of a packer, a pump mechanism, etc. can be performed easily. Further, even if the function of the packer is deteriorated or damaged, closing the flow path of the water shield plate can prevent groundwater remaining in the water injection layer from flowing into the intake layer. Accordingly, a problem such as a rise in the water level of the intake layer, which had been lowered for groundwater treatment and various investigations accompanying the ground excavation work, does not occur, and the work can be continuously performed without interruption.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an elevational sectional view showing a first embodiment of a water pump according to the present invention. FIG. 2 is a vertical sectional view showing a state in which water is injected from an intake layer toward a water injection layer in the water pumping device shown in FIG. FIG. 3 is an elevational sectional view showing a state in which water is pumped from a water injection layer and a water injection screen is washed in the water pumping device shown in FIG. FIG. 4 is an elevational sectional view showing a state where the pump mechanism is pulled up from a well pipe in the water pumping device shown in FIG. 1; FIG. 5 is a vertical sectional view showing a state in which the inside of the well pipe is cleaned by swabbing in the pumping apparatus shown in FIG. 1; FIG. 6 is a vertical sectional view showing a main part of the water pump shown in FIG. FIG. 7 is a vertical sectional view showing an example of a conventional pumping device. 8 is a vertical sectional view showing a state in which water is injected by the conventional water pumping device shown in FIG. FIG. 9 is a vertical sectional view showing a state in which the screen is cleaned by the conventional water pumping device shown in FIG. 7; [Description of Signs] 1 Impermeable layer 2 Intake layer (aquifer) 3 Injection layer (aquifer) 5 Drilling hole 6 Intake screen 7 Injection screen 8 Well pipe 10 Packer 20 Pumping device 21 Pump mechanism 22 Check valve 23 Water flow valve

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-199965 (JP, A) JP-A-6-49870 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21B 43/00

Claims (1)

(57) [Claims] [Claim 1] A plurality of aquifers are provided in the ground where an impermeable layer is interposed, and water is separately pumped from each aquifer or a predetermined aquifer is formed. A pumping device for injecting groundwater withdrawn from an aquifer into another aquifer, wherein the ground has a drilling hole that penetrates through the impermeable layer and reaches the aquifer located thereunder. In the excavation hole, there is provided an impermeable zone for partitioning the excavation hole up and down at the position of the impermeable layer to block water, and a screen penetrating the impermeable zone and corresponding to each aquifer. A well pipe is provided, and a packer is provided in the well pipe to partition the space inside the well pipe up and down at the position of the water-impermeable layer to block water, and from the aquifer located above and below the packer. A pump mechanism for injecting water into the aquifer located at the bottom and pumping water from the aquifer located below; Is disposed below the flop mechanism comprises a flow path of the ground water,
A pumping device, comprising: a water-blocking plate that closes the flow path and separates the space in the well pipe up and down instead of the packer when the packer and the pump mechanism are taken out of the well pipe to the ground.