Water pumping and return system

Abstract

To provide a water pumping and return system that enables appropriate water volume management. [Solution] A water pumping and return system comprising a water pumping return pipe connecting a water pumping pipe of a water pumping casing pipe to a water pumping return pipe, comprising a water storage pipe capable of collecting groundwater from the water pumping pipes of a plurality of water pumping casing pipes and distributing it to the return pipes of a plurality of water pumping casing pipes, a plurality of third pipelines having one end connected to the water pumping pipes of a plurality of water pumping casing pipes on a one-to-one basis and the other end connected to the return pipes of a plurality of water pumping casing pipes on a one-to-one basis, a plurality of fourth pipelines branching from each of the plurality of third pipelines and connected to the water storage pipe, and a plurality of fifth pipelines having one end connected to the water storage pipe and the other end connected to the return pipes of a plurality of water pumping casing pipes on a one-to-one basis, wherein the third pipeline is provided with a flow meter upstream of the branching point of the fourth pipeline and with a valve and flow meter downstream, the fourth pipeline is provided with a valve, and the fifth pipeline is provided with a valve and flow meter.

Description

Technical Field

[0001] The present invention relates to a pumping and return system.

Background Art

[0002] Conventionally, as a pumping and return system for pumping groundwater and returning it underground again, there are provided a pumping casing pipe, a return casing pipe, and a pumping and return path for pressurizing the groundwater pumped by the pumping casing pipe and returning it through the return casing pipe. There is known a structure in which the pumping return path is constituted by a closed path so that the groundwater flowing through the pumping return path does not contact the atmosphere (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0004] According to this pumping and return system, when pumping the groundwater that has flowed into the pumping casing pipe and returning it underground again from the return casing pipe, the groundwater does not come into contact with the atmosphere. Therefore, the dissolved iron content contained in the groundwater is prevented from contacting the atmosphere and oxidizing, and no oxidized particulate matter is generated. It is possible to prevent the ground from being clogged by the oxidized particulate matter and smoothly return the groundwater to the ground. By the way, in urban sites where the Tertiary diluvial layer and the Quaternary alluvial-diluvial layer are thickly deposited, this press-type RW (recharge well) method is often adopted. In this press-type RW method, the pumping casing pipe and the return casing pipe have been planned and constructed one-to-one. However, the pumping volume of each pumping casing pipe is not constant and varies widely, and the recharge volume of the return casing pipe also varies. It has not been realistic to average them. In this case, it is conceivable to manage the water volume in a notch tank or similar device that is open to the atmosphere. However, since the groundwater comes into contact with the atmosphere, it may not be possible to prevent the formation of red slag, and there is a risk of clogging of the screen or ground. This invention has been made in view of the above circumstances, and aims to provide a water pumping and return system that can perform appropriate water volume management. [Means for solving the problem]

[0005] The first method is, A water pumping and return system comprising a water pumping casing pipe buried in the ground, a return casing pipe buried in another part of the ground, and a water pumping return pipe connecting the water pumping pipe of the water pumping casing pipe and the return pipe of the return casing pipe, wherein groundwater that flows into the water pumping casing pipe by vacuum pumping is pressurized by an intermediate pressure pump installed in the water pumping return pipe while isolated from the atmosphere, and returned to the other part of the ground through the return casing pipe, Multiple pumping casing pipes and return casing pipes are provided, The aforementioned pumping return pipe includes: A storage pipe capable of collecting groundwater from the pumping pipes of multiple pumping casing pipes and distributing it to the return pipes of multiple return casing pipes, Multiple first pipelines, one end of which is connected to the pumping pipes of multiple pumping casing pipes in a one-to-one relationship and the other end of which is connected to the water storage pipe, It comprises a plurality of second pipelines, one end of which is connected to a water storage pipe and the other end of which communicates one-to-one with the return pipes of the plurality of return casing pipes, The pumping and return system is characterized in that a flow meter is provided in the first pipeline, and a valve and a flow meter are provided in the second pipeline.

[0006] The second method is, A water pumping and return system comprising a water pumping casing pipe buried in the ground, a return casing pipe buried in another part of the ground, and a water pumping return pipe connecting the water pumping pipe of the water pumping casing pipe and the return pipe of the return casing pipe, wherein groundwater that flows into the water pumping casing pipe by vacuum pumping is pressurized by an intermediate pressure pump installed in the water pumping return pipe while isolated from the atmosphere, and returned to the other part of the ground through the return casing pipe, Multiple pumping casing pipes and return casing pipes are provided, The aforementioned pumping return pipe includes: A storage pipe capable of collecting groundwater from the pumping pipes of multiple pumping casing pipes and distributing it to the return pipes of multiple return casing pipes, Multiple third pipelines, each having one end connected to a pumping pipe of a plurality of pumping casing pipes on a one-to-one basis, and the other end connected to a return pipe of a plurality of pumping casing pipes on a one-to-one basis, Multiple fourth pipelines branching off from each of the aforementioned multiple third pipelines and connected to the water storage pipe, It comprises a plurality of fifth pipelines, one end of which is connected to the water storage pipe and the other end of which communicates one-to-one with the return pipes of the plurality of return casing pipes, The pumping and return system is characterized in that the third pipeline is provided with a flow meter upstream of the branching point of the fourth pipeline and with a valve and flow meter downstream, the fourth pipeline is provided with a valve, and the fifth pipeline is provided with a valve and flow meter.

[0007] The third means is the first or second means, characterized in that each of the plurality of return casing pipes is provided with a gel packer, a bentonite pellet that functions as a packer is attached to the lower part of the gel packer, and a cement grout that functions as a pressure plate is attached to the upper part of the gel packer.

[0008] The fourth means is the first or second means, characterized in that a cleaning pump is provided at the tip of the return pipe of the return casing pipe.

[0009] The fifth means is the first or second means, wherein as the flow meter, at least one of an orifice flow meter, an integrating flow meter, an electromagnetic flow meter, and other flow meters that can measure the groundwater without contacting the atmosphere is provided.

Advantages of the Invention

[0010] According to the present invention, the amount of groundwater pumped from each of the plurality of pumping casing pipes and the amount of groundwater returned to each of the plurality of return casing pipes can be overall monitored and grasped, and if necessary, the amount of water returned to each of the plurality of return casing pipes can be adjusted by opening and closing the valves.

Brief Description of the Drawings

[0011] [Figure 1] It is a schematic configuration diagram of a pumping and return system according to an embodiment. [Figure 2] It is an enlarged cross-sectional view of the groundwater inflow portion of the pumping casing pipe in the pumping and return system of FIG. 1. [Figure 3] It is an enlarged cross-sectional view of the groundwater return portion of the return casing pipe in the pumping and return system of FIG. 1. [Figure 4] It is an enlarged view of the return casing pipe and its peripheral equipment in the pumping and return system of FIG. 1. [Figure 5] It is an enlarged view of the pumping casing pipe and its peripheral equipment in the pumping and return system of FIG. 1. [Figure 6] It is a view showing a part of the structure of the sand removal device cut out. [Figure 7] It is a view showing the piping structure of the first water recovery amount adjustment device. [Figure 8] It is a view showing the piping structure of the second water recovery amount adjustment device.

Embodiments for Carrying Out the Invention

[0012] Hereinafter, a pumping and return system according to an embodiment of the present invention will be described based on the drawings. [[ID=四十七]]

[0013] FIG. 1 is a diagram schematically showing a pumping and return system 100.

[0014] According to the pumping and return system 100 of the embodiment, it has the following features. Since vacuum pumping is performed by the super well point (SWP) method, pumping can be performed without contacting the groundwater containing oxygen and dissolved iron in the air. Furthermore, by blocking the groundwater flowing through the pumping and return path from the atmosphere and using the same separate screen as the super well point for the recharge well, the opportunity for the groundwater to come into contact with the air can be eliminated from pumping to recharge. Thereby, the generation of red rust (oxidation of iron) can be prevented, and clogging of the separate screen and the ground due to oxidized particulate matter caused by oxidation can be prevented.

[0015] Also, since an intermediate pressure pump is installed in the middle of the pumping and return path to pump the groundwater, it is possible to inject water from the leading end of the well. The leading end of the well is one that enables double-tube strainer injection. In a normal recharge well, it is often only possible to recharge up to the same water level as the surface layer by hydrostatic pressure. However, in this press-type recharge well method, homogeneous strainer injection can be achieved by sending recharge water from a deep position.

[0016] Furthermore, by using the intermediate viscous soil layer in the formation, consolidating the casing and the viscous soil ground by injecting a cement-based chemical solution or the like into this part, and using the soil weight (w) above the intermediate viscous soil layer as a holding load against the recharge pressure, pressurized injection by the intermediate pressure pump can be effectively performed.

[0017] Hereinafter, the details of the pumping and return system 100 according to the embodiment will be described.

[0018] Here, it is assumed that an underground barrier 10, such as an underground watertight wall or sheet piles, is formed around the ground 1 (referred to as ground 1a) in a location where underground construction is to be carried out, or where ground improvement is to be performed in a specific location, and that this underground barrier 10 separates the ground 1a in which the water pumping casing pipe 2 is to be installed. On the other hand, as the ground 1b for condensation where the return casing pipe 3 is installed, condensation will be carried out to the lower layer of the drainage target layer unless there is an impact on the water level in the same zone layer where pumping is performed by the superwellpoint and it is blocked by an underground partition 10 or the like.

[0019] In this water pumping and return system 100, a water pumping casing pipe 2 is buried in the ground 1a, and a return casing pipe 3 is buried in the ground 1b. In addition, in this water pumping and return system 100, the water pumping pipe 18 of the water pumping casing pipe 2 and the return pipe 29 of the return casing pipe 3 are connected by a water pumping return pipe. The groundwater flowing through the water pumping return pipe is isolated from the atmosphere so that it does not come into contact with the atmosphere.

[0020] (Water pumping casing pipe 2) A groundwater inlet 6 is provided at the lower end of the water pumping casing pipe 2. As shown in Figure 2, the groundwater inlet 6 consists of a vertically long inner cylinder 11 connected to the lower end of the water pumping casing pipe 2, and a vertically long strainer cylinder 12 that surrounds the outer circumference of the inner cylinder 11 with a gap 16 in between. A sand accumulation section 13 is provided at the lower end of the groundwater inlet 6. A bottom cover is also provided at the bottom of the sand accumulation section 13.

[0021] The water pumping casing pipe 2 is made of steel pipe, and the water pumping casing pipe 2 may be buried such that a filter material (not shown) filled with gravel or the like is provided between the specific ground 1a and the water pumping casing pipe 2 as needed.

[0022] The strainer cylinder 12 is, for example, cylindrical in shape, and is made of steel wire wound around its outer circumference so as to form gaps at predetermined intervals, allowing groundwater to flow into the interior through these gaps. The inner cylinder 11, which is connected to the lower end of the water pumping casing pipe 2, is made of a non-permeable material such as a steel pipe, and multiple water collection holes 15 are provided at the lower end of the inner cylinder 11 to take in groundwater that has flowed in from the strainer cylinder 12.

[0023] According to the above configuration, groundwater flows into the gap 16 between the strainer cylinder 12 and the inner cylinder 11 from the entire vertical length of the vertically long strainer cylinder 12, and the incoming groundwater flows into the inner cylinder 11 only through the water collection hole 15 at the lower end of the inner cylinder 11. In this case, even if the groundwater level is located below the upper end of the strainer cylinder 12, as long as it is located above the water collection hole 15, air that enters the gap 16 between the strainer cylinder 12 and the inner cylinder 11 from the strainer cylinder 12 cannot enter the inside of the inner cylinder 11 and will collect at the top of the gap 16. Thus, in this embodiment, an air inflow prevention means 7 is configured to prevent air from flowing into the pumping casing pipe 2 due to a drop in the groundwater level, consisting of a vertically long strainer cylinder 12 surrounding the outer circumference of the vertically long inner cylinder 11, a water collection hole 15 provided at the lower end of the inner cylinder 11, and a vertically long gap 16 between the inner cylinder 11 and the strainer cylinder 12.

[0024] A submersible pump 17 is installed in the lower part of the inner cylinder 11 where groundwater flows in and accumulates, and the lower end of a water pump 18 is connected to the water pump 17. The water pump 18 is inserted into the water pumping casing pipe 2, and the upper part of the water pump 18 is inserted through a top cover 19 that closes the upper end opening of the water pumping casing pipe 2 and is led to the ground 30. The end of a pressure reducing pipeline 20 for reducing the pressure inside the water pumping casing pipe 2 is connected to the top cover 19 of the water pumping casing pipe 2, and this pressure reducing pipeline 20 is connected to a vacuum means 5 such as a vacuum pump installed on the ground 30. By reducing the pressure inside the water pumping casing pipe 2 with this vacuum means 5, groundwater in the ground 1a is forced to flow into the inner cylinder 11 through the gap 16 between the strainer cylinder 12 and the inner cylinder 11 and through the water collection hole 15 at the lower end of the inner cylinder 11. This incoming groundwater is then pumped up using the water pump 17.

[0025] (Return casing tube 3) A groundwater return section 21 is provided at the lower part of the return casing pipe 3. As shown in Figure 3, the groundwater return section 21 consists of an inner cylindrical pipe 22 connected to the lower end of the return casing pipe 3 and a strainer cylinder 23 that surrounds the outer circumference of the inner cylindrical pipe 22 with a gap 24 in between. The inner cylindrical pipe 22 is provided with a return hole 25, and a sand accumulation section 26 is provided at the lower end of the groundwater return section 21.

[0026] The return casing pipe 3 is made of steel pipe, and the return casing pipe 3 is buried so that a filter material (Figure 4) filled with gravel or the like is provided between the ground 1b and the return casing pipe 3 as needed. In addition, as shown in Figure 4, a gel packer 27 is formed on the outer circumference of the return casing pipe 3 by injecting a waterproofing agent. This prevents the water being returned along the return casing pipe 3 from near the upper end of the strainer cylinder 23 from rising and flowing towards the ground.

[0027] The upper end opening of the return casing pipe 3 is closed by a top cover 28, and one end of the return pipe 29 is inserted through this top cover 28 and led to the ground.

[0028] The configuration of the inner cylinder 22, strainer cylinder 23, and sand accumulation section 26 can be the same as the inner cylinder 11, strainer cylinder 12, and sand accumulation section 13 of the groundwater inlet 6 provided in the aforementioned water pumping casing pipe 2. However, the return casing pipe 3 and its surrounding equipment have the following characteristics.

[0029] A. Separate screen The number of return holes 25 in the separate screen, which consists of an inner cylindrical pipe 22 and a strainer cylinder 23, is greater than the number of water collection holes 15 in the water pumping casing pipe 2.

[0030] B. Intermediate pressure pump 31 The press pressure should be approximately P ≈ 2.0 kg / cm², taking into account clogging and other factors during operation. 2The intermediate pressurizing pump 31 is selected to be capable of pressurizing the well at a level higher than the return volume (recharge volume or condensate volume) and the guideline maximum pressure, and is installed within the piping route so that the groundwater being returned does not come into contact with the atmosphere. As shown in Figure 6, the intermediate pressurizing pump 31 is, for example, a deep pump 31b installed inside a sealed tank 31a that isolates the groundwater from the atmosphere. A pressure gauge 31c is installed on the intermediate pressurizing pump 31.

[0031] C. Piping The piping materials used for recharging are primarily suction hoses and steel pipes (spiral steel pipes), taking into consideration the pressurization process, and drain hoses (such as Sunny Hose) are not used.

[0032] D. Packers etc. by chemical injection A two-component, quick-setting cement-based type is used, which allows for high-strength improvement with a small injection improvement zone. Injection is preferably performed under pressure control. Figures 1 and 4 show the gel packer 27 formed in this manner. However, in long-term recharge well applications, the press pressure P = 3-5 kg / cm² is used. 2 This means the gel packer is prone to damage. Therefore, bentonite pellets are added to the filter (filter material 14) below the chemical injection site in a certain thickness. Bentonite pellets are a material that expands due to groundwater and is flexible, so even if pressurized water blows to the surface in a cracky situation, it will naturally act as a packer and seal the area. Furthermore, as shown in Figure 4, by blocking the area above the chemical injection with cement grout, the depth (for example, H=50m × 1.8γ=90t / m) can be reduced. 2 (Effective as a pressure-resistant plate) In proportion to this, it can withstand condensate pressure as a pressure-resistant plate.

[0033] E. Rechargeable well pump If phenomena caused by clogging occur, such as a decrease in recharge volume or an increase in recharge pressure, a maintenance cleaning pump 32 (Figures 3 and 4), which is a DW (recharge well) pump of approximately 11 kW, is installed to perform backwashing and swing cleaning as well maintenance. When performing this cleaning, equipment such as a cleaning pump and a water storage tank is required, and the turbid water produced during cleaning must be treated. Note that in Figure 4, reference numeral 33 denotes a valve.

[0034] F. Sand removal equipment The groundwater pumped up by the pumping casing pipe 2 contains some fine particles. These fine particles can clog the recharge well, so to maintain the recharge condensation efficiency of the well, a sand removal device is incorporated into the pumping return pipe. For example, the sand removal device 9 shown in Figure 5 is incorporated as this sand removal device. This sand removal device 9 is a sealed type and is equipped with a removal filter 9a to remove the fine particles and a gate valve 9b to extract the removed fine particles.

[0035] (Ground equipment) The pumping return pipe installed above ground level 30 is equipped with a condensate volume control device 50 or 60 (described later), an intermediate pressurizing pump 31, and a sand removal device 9. The outlet of the sand removal device 9 and the inlet of the intermediate pressurizing pump 31 are connected by a connecting pipe 33, and the outlet of the intermediate pressurizing pump 31 is connected to the return pipe 29. As mentioned above, the intermediate pressurizing pump 31 is a deep pump 31b with a special sealed structure. Furthermore, a series of pumping and return channels 4 are formed, including a pumping pump 17, a pumping pipe 18, a pumping return pipe, a sand removal device 9, an intermediate pressurizing pump 31, and a return pipe 29. This series of pumping and return channels 4 is formed as a sealed channel so that the water flowing inside is isolated from the atmosphere and does not come into contact with the atmosphere. In this embodiment, a pumping and pressurizing return means is configured for pumping and pressurizing groundwater that has flowed into the pumping casing pipe 2 using the pumping pump 17 and the intermediate pressurizing pump 31 and returning it to the ground 1b via the return casing pipe 3.

[0036] (operation) Using the pumping and return system 100 described above, groundwater is pumped from ground 1a and the pumped groundwater is returned to another ground 1b. In this case, the vacuum means 5 reduces the pressure inside the pumping casing pipe 2, effectively collecting groundwater from the ground 1a into the inner cylinder 11 of the groundwater inlet 6 located at the lower end of the pumping casing pipe 2. The collected groundwater is then sent to the sand removal device 9, where the sand removal device 9 settles and separates the sand-like granular material in the pumped groundwater. Specifically, for example, the groundwater flows while colliding with a removal filter 9a located inside the sand removal device 9, separating and settling the sand-like granular material. The groundwater is pumped by the pumping pump 17, the sand-like granular material is removed by the sand removal device 9, and then the intermediate pressurizing pump 31 is used to further pressurize the groundwater before returning it to the return casing pipe 3 under pressure. Since the groundwater supplied to the return casing pipe 3 is pressurized, it is returned by pressurized infiltration into the ground 1b from the groundwater return section 21 located at the lower end of the return casing pipe 3.

[0037] In this way, pumping and returning groundwater is carried out continuously by flowing it through a series of pumping and return channels 4. Therefore, compared to systems that temporarily store the pumped groundwater in an open-air notch tank or the like on the surface, the processing time for the pumped groundwater can be shortened. Furthermore, since the pumping and return channel 4 is configured as a sealed channel isolated from the atmosphere during the series of pumping and return operations, the groundwater can be isolated from the atmosphere from pumping to return. This prevents dissolved iron contained in the groundwater from coming into contact with the atmosphere and oxidizing, thereby preventing the formation of oxidized granular material. As a result, the ground 1b does not become clogged with oxidized granular material when the groundwater is returned to the ground 1b, and the groundwater can be returned to the ground smoothly.

[0038] (Condensate volume control devices 50, 60) Furthermore, in the pumping return system 100 of this embodiment, one of the condensate volume management devices 50 or 60 for managing the amount of condensate is provided inside the pumping return pipe. The following describes the condensate volume control devices 50 and 60.

[0039] (First condensate volume control device 50) This first condensate volume control device 50 is incorporated into the pump return pipe and constitutes a part of the pump return pipe. The first condensate volume control device 50 concentrates the groundwater pumped up by the pumping casing pipe 2 into a large storage pipe 51, and then allows the condensate to be returned from the storage pipe 51 while monitoring the condensate pressure.

[0040] Figure 7 is a piping diagram showing the first condensate volume control device 50. The figure shows five pumping casings 2 and five return casings 3. However, the number is not limited to five. Also, the number of pumping casings 2 and the number of return casings 3 may be different.

[0041] The first condensate volume control device 50 is equipped with a water storage pipe 51 that isolates groundwater from the atmosphere. The water storage pipe 51 is sized to be able to collect groundwater from five pumping casing pipes 2 and to distribute the collected groundwater to five return casing pipes 3.

[0042] The other ends of five pipelines 521 to 525 are connected to the water storage pipe 51, with one end of each pipeline connecting to the pumping pipes 18 of five pumping casing pipes 2 in a one-to-one correspondence. Each of the pipelines 521 to 525 is equipped with a check valve on the upstream side and a flow meter on the downstream side.

[0043] Furthermore, the other ends of five pipelines 531 to 535 are connected to the water storage pipe 51, with one end of each pipeline connecting to the return pipes 29 of five return casing pipes 3 in a one-to-one correspondence. Each of the pipelines 531 to 535 is fitted with a valve, a flow meter, and a check valve in that order from upstream to downstream.

[0044] In the diagram, the valve next to the water pumping casing pipe 2 is a valve for stopping water pumping, and the pressure gauge next to the return casing pipe 3 is a pressure gauge attached to the intermediate pressurizing pump 31.

[0045] Figure 8 is a piping diagram showing the second condensate volume control device 60. The figure shows five pumping casings 2 and five return casings 3. However, the number is not limited to five. However, the number of pumping casings 2 and return casings 3 are the same.

[0046] The second condensate volume control device 60 is equipped with a water storage pipe 61. The water storage pipe 61 is sized to be able to collect excess groundwater from five pumping casing pipes 2 and to distribute the collected groundwater to five return casing pipes 3.

[0047] In this condensate volume control device 60, the pumping pipes 18 of the five pumping casing pipes 2 are connected one-to-one to the return pipes 29 of the five return casing pipes 3 via five third pipelines 621 to 625.

[0048] Additionally, four fourth pipelines, 631 to 635, branch off from the third pipelines 621 to 625, and these fourth pipelines 631 to 635 are connected to the water storage pipe 61.

[0049] Furthermore, one end of five fifth pipelines 641 to 645 is connected to the water storage pipe 61, and the other ends of the fifth pipelines 641 to 645 are connected one-to-one to the return pipes 29 of five return casing pipes 3.

[0050] Each of the third pipelines 621 to 625 is equipped with a check valve, a flow meter, and a valve in that order, from upstream to downstream, at the upstream position of the branching point. Furthermore, each of the third pipelines 621 to 625 is equipped with a valve, a flow meter, and a check valve in that order, from upstream to downstream, at the downstream position of the branching point.

[0051] Each of the fourth pipelines, 631 to 635, is equipped with a valve on the upstream side and a check valve on the downstream side. Furthermore, each of the fifth pipelines, 641 to 645, is equipped with a valve on the upstream side and a flow meter on the downstream side.

[0052] In the diagram, for convenience, the fifth pipelines 641-645 are depicted as being connected to the return casing pipe 3. However, it is preferable that the fifth pipelines 641-645 be connected to the upstream side of the intermediate pressurizing pumps 31 and sand removal devices 9 installed in the third pipelines 621-625. This would reduce the number of intermediate pressurizing pumps 31 and sand removal devices 9. Furthermore, in the same figure, the valve next to the water pumping casing pipe 2 is a valve for stopping water pumping, and the pressure gauge next to the return casing pipe 3 is a pressure gauge attached to the intermediate pressurizing pump 31. Furthermore, each pipe of the condensate volume control device 50, 60 is equipped with at least one flow meter, depending on the purpose, which may be an orifice flow meter, an integral flow meter, an electromagnetic flow meter, or any other flow meter capable of measuring groundwater without exposure to the atmosphere. Of these, the electromagnetic flow meter can store flow rates in a data logger and can also be linked with a PC.

[0053] With a pumping and return system 100 having such water volume management devices 50, 60, it is possible to monitor and understand the amount of groundwater pumped from each of the multiple pumping casing pipes 2 and the amount of groundwater returned to each of the multiple return casing pipes 3 in an overall manner. If necessary, the amount of groundwater returned to each of the multiple return casing pipes 3 can be appropriately adjusted by opening and closing valves. For example, with the pumping return system 100 equipped with the first water volume control device 50, even if the pumping volumes of the multiple pumping casing pipes 2 vary, all the pumped groundwater is collected in the storage pipe 51, so the groundwater can be appropriately distributed to each of the multiple return casing pipes 3 by opening and closing the valves. Furthermore, even if the return capacity of the multiple return casing pipes 3 varies, the groundwater can be appropriately distributed to each of the multiple return casing pipes 3 by opening and closing the valves according to their respective capacities. Furthermore, with the pumping return system 100 equipped with a second water volume adjustment device 60, when the amount of water pumped from one pumping casing pipe 2 exceeds the amount of groundwater to be returned in the corresponding return casing pipe 3, the excess groundwater can be guided to the storage pipe 51 and temporarily stored by opening and closing a valve, and then the stored groundwater can be guided to the other return casing pipe 3.

[0054] Furthermore, since bentonite pellets are provided in the filter section below the chemical injection port in the return casing tube 3, they expand due to the pressurized water even when the water is blown out, and function as a packer naturally.

[0055] Furthermore, since the area above the drug injection site is blocked with cement grout, the depth (for example, H=50m × 1.8γ=90t / m) 2 (Effective as a pressure-resistant plate) In proportion to this, it can withstand condensate pressure as a pressure-resistant plate. [Explanation of Symbols]

[0056] 1 ground 1a ground 1b Ground 2. Casing pipe for water pumping 3. Return casing tube 4. Pumping return route 5. Vacuuming methods 6 Groundwater inlet 7. Means for preventing air inflow 9 Sand removal equipment 9a Removal filter 9b Gate valve 10 compartments 11 Inner cylinder 12 Strainer tubes 15 Water collection hole 16 gaps 17 Water pump 18. Water pumping pipe 19 Top lid 20 Pressure Reducing Pipelines 21 Groundwater return section 22 Inner tube 23 Strainer tube 24 gaps 25 Return hole 27 Gel Packer 28 Top lid 29 Return tube 30 Ground 31 Intermediate pressure pump 31a Tank 31b Deep pump 31c pressure gauge 32 Maintenance and cleaning pump 33 connecting pipes 50.60 Condensate volume control device

Claims

1. A water pumping and return system comprising a water pumping casing pipe buried in the ground, a return casing pipe buried in another part of the ground, and a water pumping return pipe connecting the water pumping pipe of the water pumping casing pipe and the return pipe of the return casing pipe, wherein groundwater that flows into the water pumping casing pipe by vacuum pumping is pressurized by an intermediate pressure pump installed in the water pumping return pipe while isolated from the atmosphere, and returned to the other part of the ground through the return casing pipe, Multiple pumping casing pipes and return casing pipes are provided, The aforementioned pumping return pipe includes: A storage pipe capable of collecting groundwater from the pumping pipes of multiple pumping casing pipes and distributing it to the return pipes of multiple return casing pipes, Multiple first pipelines, one end of which is connected to the pumping pipes of multiple pumping casing pipes in a one-to-one relationship, and the other end of which is connected to the water storage pipe, It comprises a plurality of second pipelines, one end of which is connected to a water storage pipe and the other end of which communicates one-to-one with the return pipes of the plurality of return casing pipes, A water pumping and return system characterized in that a flow meter is provided in the first pipeline, and a valve and a flow meter are provided in the second pipeline.

2. A water pumping and return system comprising a water pumping casing pipe buried in the ground, a return casing pipe buried in another part of the ground, and a water pumping return pipe connecting the water pumping pipe of the water pumping casing pipe and the return pipe of the return casing pipe, wherein groundwater that flows into the water pumping casing pipe by vacuum pumping is pressurized by an intermediate pressure pump installed in the water pumping return pipe while isolated from the atmosphere, and returned to the other part of the ground through the return casing pipe, Multiple pumping casing pipes and return casing pipes are provided, The aforementioned pumping return pipe includes: A storage pipe capable of collecting groundwater from the pumping pipes of multiple pumping casing pipes and distributing it to the return pipes of multiple return casing pipes, Multiple third pipelines, each having one end connected to a pumping pipe of a plurality of pumping casing pipes in a one-to-one ratio, and the other end connected to a return pipe of a plurality of pumping casing pipes in a one-to-one ratio, A plurality of fourth pipelines branch off from each of the plurality of third pipelines and are connected to the water storage pipe, It comprises a plurality of fifth pipelines, one end of which is connected to the water storage pipe and the other end of which communicates one-to-one with the return pipes of the plurality of return casing pipes, A water pumping and return system characterized in that the third pipeline is provided with a flow meter upstream of the branching point of the fourth pipeline and a valve and flow meter downstream, the fourth pipeline is provided with a valve, and the fifth pipeline is provided with a valve and flow meter.

3. The water pumping return system according to claim 1 or 2, characterized in that each of the multiple return casing pipes is provided with a gel packer, a bentonite pellet that functions as a packer is attached to the lower part of the gel packer, and cement grout that functions as a pressure plate is attached to the upper part of the gel packer.

4. The water pumping and return system according to claim 1 or 2, characterized in that a cleaning pump is provided at the tip of the return pipe of the return casing pipe.

5. The pumping and return system according to claim 1 or 2, characterized in that at least one of the flow meters provided is an orifice flow meter, an integrating flow meter, an electromagnetic flow meter, or any other flow meter capable of measuring groundwater without it coming into contact with the atmosphere.

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