JP2007321454A - Ground water storage system, its construction method and its usage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent clogging of a solid-liquid separation means for blocking an inflow of soil particles during the construction and in use. <P>SOLUTION: The ground water storage system 1 has a water storage tank 3 buried in the ground 2 and a water supply unit 4 for pumping up the ground water stored in the water storage tank on the ground and supplying it as drinking water. The water storage tank 3 is composed of a water storage tank body 6 capable of storing the ground water within the ground 2 in its inner space and a water-intake mechanism 7 placed on a wall cross-section of the water storage tank body. The water tank body 6 is formed of caissons. The water-inlet mechanism 7 is, as shown in Fig.2, composed of a solid-liquid separation part 28 and a water-intake pipe 31 whose one end is connected to communicate with the solid-liquid separation part and the other end is connected to the inner space of the water storage tank body 6. The solid-liquid separation part 28 is placed on a circumferential surface of the water storage tank body 6 in an annular state in order that its water-intake side is exposed on the circumferential surface of the water storage tank body 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a groundwater storage system that supplies drinking water mainly in an emergency, a construction method thereof, and a usage method thereof.

  Technology has been widely researched and developed for various purposes by constructing a water storage facility underground. An underground dam is a typical example, but recently, water storage facilities that can supply water in an emergency have been widely proposed, and the water in the storage tank is always kept fresh and consideration is given to the destruction of pipelines in the event of a disaster. (Japanese Patent Laid-Open No. 3-275486), those designed to supply a large amount of water (Japanese Patent Laid-Open No. 2000-38747), those using groundwater as a water source (Japanese Patent Laid-Open No. 2001-107403, Japanese Patent Laid-Open No. 2001-115507), etc. Can be enumerated.

  Here, according to the groundwater storage tank proposed by the applicant (Japanese Patent Laid-Open No. 9-32016), the groundwater storage tank portion is formed by excavating the inner side surrounded by the water shielding structure. In addition to ensuring a sufficient amount of storage, by forming a water-impervious structure in the ground containing groundwater such as aquifer ground, the groundwater in the aquifer ground can flow into the storage tank. Is possible. In addition, since an artificial ground for closing the water storage tank portion can be provided at the upper end of the water-impervious structure, it is possible to provide a facility such as a park on the artificial ground for effective use of the land.

JP-A-9-32016 JP 2001-115507 A JP 2001-107403 A JP 2000-38747 A JP-A-3-275486 JP-A-2005-313137

  Here, in order to build a water storage tank in the ground to store groundwater and use it as drinking water, it is necessary to install solid-liquid separation means to block the inflow of soil particles at the groundwater intake point In addition, in the case of constructing a large-scale water tank assuming a disaster, the solid-liquid separation means described above may be damaged during the construction of the water tank, or in the case where a small tank is buried in the ground. There was a problem of clogging due to the inflow of earth and sand.

  In addition, even after the start of service, maintenance of the solid-liquid separation means is indispensable. However, once the water storage tank is constructed in the ground, there is a problem that the maintenance becomes difficult.

  The present invention has been made in consideration of the above-described circumstances, and a groundwater storage system capable of preventing clogging of solid-liquid separation means for blocking inflow of soil particles during construction and in service, and a construction method thereof And its usage.

  In order to achieve the above object, a groundwater storage system according to the present invention includes, as described in claim 1, a storage tank body embedded in the ground and capable of storing groundwater in the ground in an internal space, and the storage tank body. In a groundwater storage system comprising a water storage tank comprising a water intake mechanism installed in a wall section and a water supply facility for pumping and supplying groundwater stored in the water tank to the ground, the water intake side is The solid-liquid separator exposed on the peripheral surface of the water tank main body, and a water intake pipe having one end connected to the solid-liquid separator and the other end connected to the internal space of the water tank main body, A cleaning mechanism comprising a cleaning pipe whose one end is connected to the solid-liquid separation part below the connection position of the intake pipe and a pumping pump connected to the other end of the cleaning pipe. is there.

  Further, the groundwater storage system according to the present invention is provided with a filtration filter at the other end of the water intake pipe constituting the water intake mechanism, and the cleaning mechanism is branched from the water intake pipe and the tip is an internal space of the water storage tank body. And a check valve attached to the tip of the branch pipe.

  Further, in the groundwater storage system according to the present invention, the solid-liquid separation unit includes a core part having pressure resistance and water permeability and having a gap formed therein, and a solid part disposed so as to overlap the water intake side of the core part. The screen is composed of a liquid separation screen and a perforated plate for screen protection disposed on the front surface of the solid-liquid separation screen on the side opposite to the core portion.

  Moreover, the construction method of the groundwater storage system according to the present invention includes a water tank main body capable of storing groundwater in the ground in the internal space, and a water intake installed on the wall cross section of the water tank main body as described in claim 4. Water intake composed of a solid-liquid separator exposed on the peripheral surface of the water tank main body and a water intake pipe having one end connected to the solid-liquid separator and the other end connected to the internal space of the water tank main body A water storage tank comprising a mechanism is embedded in the ground, and a cleaning pipe whose one end is connected to the solid-liquid separation part below the connection position of the intake pipe is connected to the other end of the cleaning pipe. After installing the water storage pump and the water supply equipment that pumps the groundwater stored in the water storage tank to the ground and supplies it to the ground, the water storage tank is buried in the ground. Before, through the intake pipe or the washing pipe It is intended to dissolve the water-soluble sheet sandwiched between the solid-liquid solid-liquid constituting the separating portion separating screen and the screen protective perforated plate disposed in front by injecting water or hot water Te.

  Moreover, the usage method of the groundwater storage system which concerns on this invention is the water tank main body which can be embedded in the ground and can store the groundwater in this ground in internal space, and the wall body of this water tank main body as described in Claim 5 A water storage tank comprising a water intake mechanism installed in a cross-section, and a water supply facility for pumping and supplying groundwater stored in the water tank to the ground, the water intake side is the peripheral surface of the water tank body A solid-liquid separation part exposed to the solid-liquid separation part, and a water intake pipe having one end connected to the solid-liquid separation part and the other end connected to the internal space of the water storage tank body, from the connection connection position of the water intake pipe In a method for using a groundwater storage system having a cleaning mechanism including a cleaning pipe having one end connected to the solid-liquid separation unit and a pumping pump connected to the other end of the cleaning pipe, When storing the groundwater into the solid-liquid component And the soil particles flowing into the water intake mechanism together with the groundwater are shut off by the solid-liquid separation unit, and during the maintenance, the pump is operated to operate the pump. After the groundwater stored in the water tank main body flows back into the intake pipe, and further flows into the solid-liquid separation part, it is discharged from the pumping pump through the washing pipe, so that the solid-liquid separation part The dirt particles that have been blocked and stayed or settled in the space of the solid-liquid separation section or surrounding space are removed from the solid-liquid separation section in the form of being entrained in the reverse flowing ground water, and the washing pipe and the pump Through the system.

  Moreover, the usage method of the groundwater storage system according to the present invention is as described in claim 6, wherein the reservoir body embedded in the ground and capable of storing the groundwater in the ground in the internal space, and the wall of the reservoir body A water storage tank comprising a water intake mechanism installed in a cross-section, and a water supply facility for pumping and supplying groundwater stored in the water tank to the ground, the water intake side is the peripheral surface of the water tank body A solid-liquid separation part exposed to the water, a water intake pipe having one end connected to the solid-liquid separation part and the other end connected to the internal space of the water storage tank body, and a filtration provided at the other end of the water intake pipe A cleaning pipe, one end of which is connected to the solid-liquid separator below the connection position of the intake pipe, a pump that is connected to the other end of the cleaning pipe, and the intake pipe Branched from the tip and communicated with the interior space of the water tank body In the method of using a groundwater storage system having a cleaning mechanism composed of a branch pipe and a check valve attached to the tip of the branch pipe, when storing groundwater, the groundwater is separated from the solid-liquid separation unit, While flowing into the water storage tank main body through the intake pipe and the filtration filter, the solid particles separated into the intake mechanism together with the groundwater are blocked by the solid-liquid separation unit, and the pump is operated during maintenance. The groundwater stored in the water tank main body is caused to flow back to the intake pipe through the check valve and the branch pipe, and further flowed into the solid-liquid separation unit, and then the pumping pump through the washing pipe By discharging from the ground, the soil particles blocked by the solid-liquid separation part and staying or precipitating in the voids of the solid-liquid separation part or surrounding space thereof are entrained in the reverse flowing groundwater. Was removed from the solid-liquid separation unit is configured to discharge to the outside of the system through the cleaning tube and the water pumps.

  In the groundwater storage system according to claim 1, a water tank embedded in the ground and capable of storing ground water in the ground, a water tank body in which ground water is stored in an internal space, and a wall cross section of the water tank body A water intake mechanism installed on the water tank, and the water intake side is exposed to the solid-liquid separator exposed on the peripheral surface of the water tank main body, and one end is connected to the solid-liquid separator and the other end is connected to the solid-liquid separator. It is comprised with the intake pipe connected with the internal space of the said water tank main body.

  In such a configuration, groundwater in the ground in which the water storage tank is buried flows into the solid-liquid separation part of the water intake mechanism, and then flows into the water tank main body through the water intake pipe and flows into the water intake mechanism together with the groundwater. The soil particles are blocked by the solid-liquid separator provided in the water intake mechanism and do not flow into the water tank main body.

  On the other hand, in the groundwater storage system according to the present invention, in the solid-liquid separation unit, a cleaning pipe having one end connected in communication below the connection connection position of the intake pipe, and a pumped water in which the other end of the cleaning pipe is connected A cleaning mechanism comprising a pump is provided.

  When the pump is operated in such a configuration, the groundwater stored in the water tank main body flows backward through the intake pipe and flows into the solid-liquid separation part, and further flows to the pump through the washing pipe. Then, by this groundwater backflow operation, the soil particles that have been blocked by the solid-liquid separation unit and stayed or settled in the space of the solid-liquid separation unit or its surrounding space are separated into the solid-liquid separation in the form of being entrained in the backflowing groundwater. It is removed from the system and discharged out of the system through a cleaning pipe and a pump.

  Therefore, it is possible to store groundwater in the water tank main body while preventing the inflow of soil particles, and it is possible to discharge the soil particles staying or precipitating in the solid-liquid separation part to the outside of the system as needed. It becomes an excellent system.

  Although what kind of structure is adopted as the water supply equipment is arbitrary, the groundwater storage system and the construction method thereof according to the present invention can employ an air lift pump with few failures and easy maintenance. The air lift pump pumps up water with reduced specific gravity by water pressure by sending air to the water supply pipe through an air supply pipe connected to the lower end of the water supply pipe. Since it has been widely used in the past, detailed description is omitted.

  As long as a water intake mechanism can be installed in the wall cross section of the water storage tank main body, how it is configured is arbitrary, and caisson, underground continuous wall, and other retaining walls can be used. Here, the type of the water tank main body may be appropriately selected according to the scale, and a caisson or underground continuous wall is selected for a large water tank main body having an outer diameter of several tens of meters. For example, “Urban Ring” (registered trademark) may be selected as the water tank main body. "Urban ring" is a ring-shaped piece that is assembled into a ring body at the settling point, and the ring body is pushed down into the ground while digging down the inside, and is included in other earth retaining walls as referred to in the present invention. And

  Here, in the case where it is necessary to filter the groundwater that has passed through the solid-liquid separation unit, a filtration filter is provided at the other end of the intake pipe that constitutes the intake mechanism described above, and the tip is branched from the intake pipe and the tip is the water storage tank body. It is preferable to provide the above-described cleaning mechanism with a branch pipe communicated with the internal space and a check valve attached to the tip of the branch pipe.

  Here, the check valve is configured to block the flow from the water intake pipe through the branch pipe to the water storage tank main body and to allow the flow from the water storage tank main body through the branch pipe to the water intake pipe.

  In such a configuration, the groundwater in the ground flows into the solid-liquid separator and the water intake pipe, then passes through the filtration filter provided at the tip of the water intake pipe, and then flows into the water tank main body. Here, since the check valve is configured to block the flow from the water intake pipe to the water tank body through the branch pipe as described above, the groundwater flows into the water tank body without passing through the filtration filter. There is no.

  On the other hand, when the pump is operated, the groundwater stored in the water tank main body flows back from the branch pipe to the intake pipe and further to the solid-liquid separation section through the check valve, and further through the washing pipe to the pump. It flows to. Then, by this groundwater backflow operation, the soil particles that have been blocked by the solid-liquid separation unit and stayed or settled in the space of the solid-liquid separation unit or its surrounding space are separated into the solid-liquid separation in the form of being entrained in the backflowing groundwater. It is removed from the system and discharged out of the system through a cleaning pipe and a pump.

  Here, since the check valve is configured to allow the flow from the water tank main body to the water intake pipe through the branch pipe as described above, the groundwater stored in the water tank main body has a predetermined water permeability. It does not enter the intake pipe from the filtration filter having resistance, and flows into the intake pipe through the branch pipe. Therefore, it is possible to entrain the soil particles that have stayed or settled in the sediment separator. An inflow speed or an inflow pressure can be secured.

  Thus, the groundwater filtered by the filtration filter can be stored in the water tank main body while preventing the inflow of the soil particles, and the soil particles staying or precipitating in the solid-liquid separation unit are discharged out of the system at any time. It becomes possible and it becomes a system excellent in maintenance.

  As long as the solid-liquid separation part in each invention mentioned above can isolate | separate ground water and the earth particle which is going to flow in with this ground water, it is arbitrary how it comprises, For example, patent 2765327 description It is possible to improve the drainage material.

  That is, the solid-liquid separation part includes a core part having pressure resistance and water permeability and having a gap formed therein, a solid-liquid separation screen arranged so as to overlap the water intake side of the core part, and the core part And a perforated plate for screen protection disposed on the front surface of the solid-liquid separation screen on the opposite side.

  According to such a configuration, the core portion resists a part of the water pressure and the earth pressure and maintains the gap formed therein, and as a result, a sufficient water intake space is secured on the back side of the solid-liquid separation screen. The groundwater in the ground passes through the water-permeable holes formed in the perforated plate for screen protection and the solid-liquid separation screen, flows into the gap in the core part, and passes through the intake pipe to the internal space of the water storage tank body. Inflow. Also, the soil particles that try to flow into the core together with the groundwater are blocked by the solid-liquid separation screen according to the size of the solid-liquid separation screen.

  In addition, the perforated plate for protecting the screen protects the solid-liquid separation screen from being damaged by friction or the like during construction for constructing the water tank main body according to the present invention in the ground, and during operation, By supporting most of the earth pressure, the earth pressure loading on the solid-liquid separation screen is prevented, and thus the solid-liquid separation screen is protected.

  Such a solid-liquid separator is preferably housed in a steel casing, for example. In such a configuration, the intake pipe and the washing pipe described above are connected in communication with the back plate of the casing, and the perforated plate for screen protection of the solid-liquid separation unit is installed on the front open surface of the casing.

  Hereinafter, embodiments of a groundwater storage system, a construction method thereof, and a usage method thereof according to the present invention will be described with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.

(First embodiment)

  FIG. 1 is a diagram illustrating a groundwater storage system according to the present embodiment. As can be seen from the figure, the groundwater storage system 1 according to the present embodiment includes a water tank 3 embedded in the ground 2 and a water supply facility that pumps the groundwater stored in the water tank to the ground and supplies it as drinking water. 4.

  The water tank 3 is composed of a water tank main body 6 capable of storing the groundwater in the ground 2 in the internal space, and a water intake mechanism 7 installed on a wall cross section of the water tank main body. The water tank main body 6 is a caisson. It is configured.

  Such a water tank 6 has a depth (height) of 50 m and an inner diameter of more than 30 m, assuming that the water supply target is 5,000 people, 320 liters per person, and the supply days are 20 days in an emergency such as an earthquake disaster. It will be scale.

  The water supply facility 4 includes an emergency compressor 8 that operates on a gasoline engine, an air supply pipe 9 that pumps air from the emergency compressor, a water supply pipe 10 that is connected to a hollow interior at the lower end, and a water supply pipe 10 that communicates with the hollow interior. The water supply pipe discharge side is constituted by a water purification vehicle 11 connected to the raw water side, and by sending air into the water supply pipe 10 through the air supply pipe 9, the groundwater stored in the water tank main body 6 is so-called air lift pump. The water can be pumped to the ground by the above principle, and the pumped ground water is purified by the water purification vehicle 11 and can be supplied as drinking water.

  As shown in FIG. 2, the water intake mechanism 7 includes a solid-liquid separator 28 and a water intake pipe 31 having one end connected to the solid-liquid separator and the other end connected to the internal space of the water storage tank body 6. The solid-liquid separator 28 is annularly installed on the peripheral surface of the water tank main body 6 so that the water intake side is exposed on the peripheral surface of the water tank main body 6 as can be seen in FIG.

  Here, as can be seen in FIGS. 2 and 3, the solid-liquid separation unit 28 is disposed so as to overlap the core 21 having pressure resistance and water permeability and having a gap formed therein, and the water intake side of the core. The solid-liquid separation screen 22 and a screen-protecting perforated plate 23 disposed on the front surface of the solid-liquid separation screen 22 on the side opposite to the core portion 21.

  The core portion 21 only needs to have a pressure resistance enough to support a part of the earth pressure and the water pressure at the depth position where the water intake mechanism 7 is installed, and thereby hold a gap formed therein. .

  For example, the core portion 21 may be a compression-resistant blister structure commercially available from Toyobo Co., Ltd. under the trade name “Cosmogio” (registered trademark).

  As the solid-liquid separation screen 22, a screen having a mesh size of 0.2 mm, which is also commercially available from Toyobo Co., Ltd. under the trade name “Arrocatch” (registered trademark), can be used.

  Moreover, the perforated plate 23 for screen protection can use the punching metal (51% in conversion of aperture ratio) which arrange | positioned the 30 mm diameter hole triangularly with a 40 mm pitch, for example.

  The solid-liquid separator 28 configured in this way is housed in a steel casing 24, and the intake pipe 31 described above is connected in communication with the back plate of the casing 24 and the solid-liquid separator 28. The perforated plate 23 for screen protection is installed on the front open surface of the casing 24.

  On the other hand, as shown in FIGS. 1 and 2, the groundwater storage system 1 according to the present embodiment has one end at the inner space of the casing 24 below the connection connection position of the intake pipe 31, more specifically for solid-liquid separation. The cleaning pipe 25a is connected in communication with the front space of the screen 22, the pumping pump 26 is connected to the other end of the cleaning pipe, and the watering device 27 is connected to the pumping pump 26 through the cleaning pipe 25b. The cleaning mechanism 5 is provided.

  In order to construct the groundwater storage system 1 according to the present embodiment, first, the water storage tank 3 is embedded in the ground 2. The water storage tank 3 is constructed on site by a caisson made of reinforced concrete, for example, by a pneumatic caisson method, and is embedded in the ground 2 while digging down the ground 2 located at the bottom of the caisson. The reaction force may be taken from the anchor (not shown) and then set in the ground 2.

  The solid-liquid separator 28, the casing 24 storing the solid-liquid separator 28, and the intake pipe 31 and the cleaning pipe 25a connected to the casing are embedded in advance in the casing when the caisson casing is extended upward.

  Here, prior to embedding the casing 24 in the caisson housing, the water-soluble sheet 41 is sandwiched between the screen protecting porous plate 23 and the solid-liquid separation screen 22 accommodated in the casing 24 as shown in FIG. deep.

  The water-soluble sheet 41 is formed so as to dissolve at a predetermined temperature. For example, polyvinyl alcohol fiber (PVA fiber) commercially available from Kuraray Co., Ltd. under the trade name “KURALON K-II” (registered trademark). Can be configured.

  Next, in the water storage tank 3 described above, after the circular bottom plate and the cylindrical wall body standing from the periphery of the bottom plate are constructed, the air supply pipe 9 and the water supply pipe 10 constituting the water supply equipment 4 are stored in water. While being built in the tank main body 6, the pumping pump 26 and the washing pipes 25a and 25b which comprise the washing | cleaning mechanism 5 are piped. At this stage, both the on-off valves 29 and 30 (FIGS. 2 and 4) attached to the intake pipe 31 and the cleaning pipe 25a are closed so that the groundwater does not flow in.

  Next, a top plate covering the cylindrical wall is constructed to complete the water tank main body 6, and the top of the top plate is backfilled. After that, the inlet of the air pipe 9 is connected so that the emergency compressor 8 can be connected. The discharge port of the water intake 10 is configured so that it can be connected to the raw water side of the water purification vehicle 11. Further, the discharge port of the cleaning pipe 25 b is connected to the watering device 27.

  Next, before starting operation of the groundwater storage system 1 according to this embodiment, by injecting water or hot water through the intake pipe 31, the solid-liquid separation screen 22 and the screen-protecting perforation disposed on the front surface thereof are provided. The water-soluble sheet 41 sandwiched between the plates 23 is melted.

  According to such a configuration, it is possible to prevent the earth and sand from flowing into the casing 24 in which the solid-liquid separation unit 28 is accommodated before the operation of the groundwater storage system 1 is started.

  The ground surface after backfilling can be greened by, for example, providing a park, a promenade, a green space, and planting.

  In using the groundwater storage system 1 constructed in this way, when storing groundwater, the on-off valve 30 is closed and the on-off valve 29 is opened. If it does in this way, as shown in FIG. 5, the groundwater in the ground 2 will flow into the internal space of the water tank main body 6 via the solid-liquid separation part 28 and the intake pipe 31, and will flow into the intake mechanism 7 with groundwater. The clay particles 32 are blocked by the solid-liquid separation screen 22 of the solid-liquid separation unit 28 and settled under the casing 24.

  Next, in the event of an emergency such as an earthquake, the emergency compressor 8 is operated to send air into the water supply pipe 10 via the air supply pipe 9. If it does in this way, since the groundwater stored by the water storage tank main body 6 is pumped on the ground by the principle of what is called an air lift pump, after purifying this with the water purification vehicle 11, it will be used as drinking water.

  Here, as described above, the emergency compressor 8 is a gasoline engine drive type on the assumption that a commercial power supply cannot be used, and can supply drinking water without any problems even during a power failure.

  On the other hand, when performing maintenance, both the on-off valve 29 and the on-off valve 30 are opened and the pumping pump 26 is operated.

  In this way, as shown in FIG. 6, the groundwater stored in the water storage tank body 6 flows backward through the intake pipe 31 and flows into the casing 24 in which the solid-liquid separation unit 28 is accommodated, and then the solid-liquid separation. The soil particles 32 that cannot pass through the screen 22 and have settled near the bottom of the casing 24 are taken from the water sprinkler 27 together with the soil particles through the cleaning pipe 25a, the pumping pump 26, and the cleaning pipe 25b. The Also, the soil particles adhering to the inflow side of the solid-liquid separation screen 22 are peeled off from the casing by the momentum of the groundwater flowing back from the intake pipe 31 and discharged in the same manner.

  The water sprinkled from the water sprinkler 27 is discharged outside the system, but if the backfilled ground surface is greened as described above, it can be used effectively as irrigation water.

  In addition, since the pumping pump 26 and the water sprinkling device 27 are used in normal times, they may be used by supplying power from a commercial power source or any other power source.

  Here, during normal times, the water tank main body 6 is communicated with the atmosphere through an air vent pipe (not shown), so that when the internal water level becomes the same as the ground water level, the ground water will not flow, but during maintenance, Similarly, if the groundwater storage system 1 according to the present embodiment is operated and discharged from the sprinkler 27, then the on-off valve 30 is closed and the on-off valve 29 is opened, fresh groundwater from the ground 2 is stored in the reservoir body 6. It will flow into the internal space, and fresh ground water can flow into the water tank main body 6 at any time.

  As described above, according to the groundwater storage system 1 according to the present embodiment, groundwater can be stored in the water tank main body 6 while preventing the inflow of soil particles, and the solid-liquid separation unit 28 is accommodated. The soil particles staying or settled in the casing 24 can be discharged out of the system at any time, and the system is excellent in maintenance.

  That is, the solid-liquid separation portion 28 is divided into a core portion 21 having pressure resistance and water permeability and having a void formed therein, a solid-liquid separation screen 22 disposed on the water intake side of the core portion, and a core Since the screen protection porous plate 23 is disposed on the front side of the solid-liquid separation screen 22 on the side opposite to the portion 21, the core portion 21 resists a part of the water pressure and earth pressure and enters the inside thereof. The formed gap is held as it is, and as a result, a sufficient water intake space is secured on the back side of the solid-liquid separation screen 22.

  Therefore, the groundwater in the ground passes through the water-permeable holes formed in the screen-protecting porous plate 23 and the solid-liquid separation screen 22 and flows into the gap of the core portion 21, and passes through the water intake pipe 31 to the inside of the water tank main body 6. It flows into the space. Moreover, the soil particles that are about to flow into the core portion 21 together with the groundwater are blocked by the solid-liquid separation screen according to the size of the solid-liquid separation screen 22.

  Moreover, according to the construction method and usage method of the groundwater storage system 1 according to the present embodiment, the perforated plate 23 for screen protection is subjected to frictional force due to caisson settling during construction for constructing the water tank main body 6 in the ground. In addition to protecting the solid-liquid separation screen 22 from being damaged, it supports most of the earth pressure during operation, thereby preventing the earth-pressure loading on the solid-liquid separation screen 22 and thus for solid-liquid separation. The screen 22 can be protected.

  Further, according to the construction method of the groundwater storage system 1 according to the present embodiment, prior to embedding the casing 24 in the caisson housing, the screen protection porous plate 23 accommodated in the casing 24 and the solid-liquid separation screen 22 The water-soluble sheet 41 is sandwiched between them, and water or hot water is injected through the water intake pipe 31 in the stage before starting the service, so that the water-soluble sheet 41 is melted. It is possible to prevent the earth and sand from flowing into the casing 24 before clogging and clogging the solid-liquid separation screen 22.

  In the present embodiment, the watering device 27 is provided on the premise that the backfilled ground surface is green, and the water used for maintenance is used as irrigation. Instead, it is simply discharged out of the system. It doesn't matter if you do. In such a configuration, the watering device 27 can be omitted.

  Although not particularly mentioned in the present embodiment, a jet is sent into the casing 24 via the cleaning pipe 25a before the water stored in the internal space of the water tank main body 6 is caused to flow backward during maintenance. May be.

  According to such a configuration, the soil particles that have settled in the casing 24 soar in the casing, so that the soil particles can be collected more efficiently by the pumping pump 26.

  In the present embodiment, the solid-liquid separation part 28 is accommodated in the casing 24. Instead, a trench-like groove is formed on the peripheral surface of the water tank main body 6, and the groove is formed in the groove. After accommodating the solid-liquid separation part 28, the trench-shaped groove may be covered with the screen protecting porous plate 23.

  Moreover, in this embodiment, although the water tank main body 6 was comprised with the caisson, it may replace with this and may comprise with an underground continuous wall. In such a case, the water intake mechanism 7 is placed in front of the reinforcing bar, and the water intake mechanism 7 is appropriately sealed with a seal or the like as necessary so that the concrete does not rotate. Can be removed.

  In the present embodiment, the on / off valves 29 and 30 are provided on the intake pipe 31 and the washing pipe 25a, respectively. However, for example, the tip of the intake pipe 31 or the washing pipe 25a is covered with a cap to prevent the inflow of groundwater before starting operation. If this can be prevented, the on-off valves 29 and 30 may be omitted.

  In the present embodiment, the groundwater stored in the water storage tank 3 is pumped to the ground and supplied as drinking water. However, the groundwater stored in the water storage tank 3 can be used for purposes other than drinking water. For example, it can be used as domestic water.

(Second Embodiment)

  Next, a second embodiment will be described. Note that components that are substantially the same as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  A groundwater storage system 1 ′ according to the second embodiment includes a water tank 3 ′ embedded in the ground 2, and a water supply facility 4 that pumps the groundwater stored in the water tank to the ground and supplies it as drinking water. The water storage tank 3 'includes a water storage tank main body 6 and a water intake mechanism 7' installed on the wall cross section of the water storage tank main body. The groundwater storage system 1 ′ is the same as that of the first embodiment except that the water intake mechanism 7 and the cleaning mechanism 5 are the water intake mechanism 7 ′ and the cleaning mechanism 5 ′, respectively.

  As shown in FIG. 7, the water intake mechanism 7 ′ includes a solid-liquid separator 28 and a water intake pipe 31 having one end connected to the solid-liquid separator and the other end connected to the internal space of the water storage tank body 6. As shown in FIG. 3, the solid-liquid separator 28 is annularly installed on the peripheral surface of the water tank main body 6 so that the water intake side is exposed on the peripheral surface of the water tank main body 6. In the second embodiment, a filtration filter 72 is provided at the other end of the intake pipe 31.

  The filtration filter 72 may be appropriately selected from known activated carbon filters, for example.

  As in the first embodiment, one end of the cleaning mechanism 5 ′ is connected to the internal space of the casing 24, more specifically, the front space of the solid-liquid separation screen 22 below the connection connection position of the intake pipe 31. The cleaning pipe 25a includes a pumping pump 26 to which the other end of the cleaning pipe is connected, and a watering device 27 connected to the pumping pump 26 through the cleaning pipe 25b. In the second embodiment, the water intake pipe 31 is provided. A branch pipe 73 branched from the pipe and having a tip communicating with the internal space of the water storage tank body 6 and a check valve 71 attached to the branch pipe are provided.

  Here, the check valve 71 blocks the flow from the intake pipe 31 through the branch pipe 73 to the internal space of the water tank main body 6, and from the internal space of the water tank main body 6 through the branch pipe 73 to the intake pipe 31. It is configured to allow the flow to reach.

  The procedure for constructing the groundwater storage system 1 ′ according to the present embodiment is to provide a filtration filter 72 at the other end of the intake pipe 31, branch a branch pipe 73 from the intake pipe 31, and install a check valve 71 in the branch pipe. Since it is the same as that of 1st Embodiment except the point provided, the description is abbreviate | omitted here.

  Next, when using the groundwater storage system 1 ′, when storing groundwater, the on-off valve 30 is closed and the on-off valve 29 is opened. In this way, as shown in FIG. 7, the groundwater in the ground 2 flows into the solid-liquid separator 28 and the water intake pipe 31, and then passes through the filtration filter 72 provided at the tip of the water intake pipe 31. Then, it flows into the internal space of the water tank main body 6. Here, the check valve 71 is configured to block the flow from the water intake pipe 31 through the branch pipe 73 to the internal space of the water tank main body 6 as described above. Groundwater does not flow into the internal space of the tank body 6.

  On the other hand, the soil particles 32 that have flowed into the water intake mechanism 7 ′ together with the groundwater are blocked by the solid-liquid separation screen 22 of the solid-liquid separation unit 28 and settled under the casing 24.

  Next, since the usage method in an emergency is the same as that of the first embodiment, the description thereof is omitted here.

  On the other hand, when performing maintenance, the on-off valve 29 is closed, the on-off valve 30 is opened, and the pumping pump 26 is operated.

  In this way, the flow reversely flows from the branch pipe 73 to the intake pipe 31 and further to the solid-liquid separation section 28 via the check valve 71 and flows into the casing 24 in which the solid-liquid separation section 28 is accommodated. While entraining the soil particles 32 that could not pass through the liquid separation screen 22 and settled near the bottom of the casing 24 and the soil particles adhering to the inflow side of the solid-liquid separation screen 22, the cleaning tube 25a, It is discharged from the sprinkler 27 together with the soil particles via the pumping pump 26 and the cleaning pipe 25b. The water sprinkled from the water sprinkler 27 is discharged outside the system, but if the backfilled ground surface is greened as described above, it can be used effectively as irrigation water.

  As described above, according to the groundwater storage system 1 ′ according to the present embodiment, the same effects as the groundwater storage system 1 can be obtained, and the groundwater filtered by the filtration filter 72 can be prevented while preventing the inflow of soil particles. While being able to store in the internal space of the water tank main body 6, it becomes possible to discharge | emit the soil particle 32 which has stayed in the solid-liquid separation part 28 to the system outside at any time, and it becomes a system excellent in maintenance. .

  In the present embodiment, the watering device 27 is provided on the premise that the backfilled ground surface is green, and the water used for maintenance is used as irrigation. Instead, it is simply discharged out of the system. It doesn't matter if you do. In such a configuration, the watering device 27 can be omitted.

  Although not particularly mentioned in the present embodiment, a jet is sent into the casing 24 via the cleaning pipe 25a before the water stored in the internal space of the water tank main body 6 is caused to flow backward during maintenance. May be.

  According to such a configuration, the soil particles that have settled in the casing 24 soar in the casing, so that the soil particles can be collected more efficiently by the pumping pump 26.

  In the present embodiment, the solid-liquid separation part 28 is accommodated in the casing 24. Instead, a trench-like groove is formed on the peripheral surface of the water tank main body 6, and the groove is formed in the groove. After accommodating the solid-liquid separation part 28, the trench-shaped groove may be covered with the screen protecting porous plate 23.

  Moreover, in this embodiment, although the water tank main body 6 was comprised with the caisson, it may replace with this and may comprise with an underground continuous wall. In such a case, the water intake mechanism 7 'is placed in front of the reinforcing bar, and the water intake mechanism is appropriately sealed with a seal or the like as necessary so that the concrete does not rotate, and the inside of the water tank main body 6 is excavated. Remove the seal.

  In the present embodiment, the on / off valves 29 and 30 are provided on the intake pipe 31 and the washing pipe 25a, respectively. However, for example, the tip of the intake pipe 31 or the washing pipe 25a is covered with a cap to prevent the inflow of groundwater before starting operation. If this can be prevented, the on-off valves 29 and 30 may be omitted.

  Even in such a case, the check valve 71 is configured to allow a flow from the water tank main body 6 to the water intake pipe 31 via the branch pipe 73, so that the groundwater stored in the water tank main body 6 is It does not enter the water intake pipe 31 from the filtration filter 72 having a predetermined water resistance, but flows into the water intake pipe 31 via the branch pipe 73, and therefore the soil particles 32 can be entrained.

  In the present embodiment, the groundwater stored in the water storage tank 3 ′ is pumped to the ground and supplied as drinking water. However, the groundwater stored in the water storage tank 3 ′ is used for purposes other than drinking water. Of course, it is possible, for example, it can be used as domestic water.

1 is a schematic diagram of a groundwater storage system according to a first embodiment. The detailed sectional view of water intake mechanism 7. FIG. The perspective view which displayed the solid-liquid separation part 28 partially in cross section. Sectional drawing which showed a mode that the water-soluble sheet | seat 41 was inserted | pinched between the perforated plate 23 for screen protection, and the screen 22 for solid-liquid separation. The figure which showed a mode that the groundwater is stored. The figure which showed a mode that the solid-liquid separation part 28 was wash | cleaned. The detailed sectional view showing water intake mechanism 7 'concerning a 2nd embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Groundwater storage system 2 Ground 3 Water tank 4 Water supply equipment 5 Washing mechanism 6 Water tank main body 7,7 'Water intake mechanism 28 Solid-liquid separation part 21 Core part 22 Solid-liquid separation screen 23 Screen protection perforated plates 25a, 25b Washing pipe 26 Pumping pump 71 Check valve 73 Branch pipe

Claims (6)

A water tank comprising a water tank main body embedded in the ground and capable of storing ground water in the ground in an internal space, and a water intake mechanism installed on a wall section of the water tank main body, and ground water stored in the water tank In a groundwater storage system equipped with a water supply facility that pumps and supplies water to the ground,
The water intake mechanism includes a solid-liquid separation part whose intake side is exposed on the peripheral surface of the water tank main body, and a water intake whose one end is connected to the solid-liquid separation part and the other end is connected to the internal space of the water tank main body. The water pipe is composed of a cleaning pipe whose one end is connected to the solid-liquid separation part below the communication connection position of the water intake pipe, and a pump that is connected to the other end of the cleaning pipe. A groundwater storage system characterized by having a cleaning mechanism. A filtration filter is provided at the other end of the water intake pipe constituting the water intake mechanism, and a branch pipe branched from the water intake pipe and having a leading end communicated with the internal space of the water storage tank main body, and the branch pipe The groundwater storage system of Claim 1 provided with the non-return valve attached to the front-end | tip. The solid-liquid separation part is opposite to the core part, a core part having pressure resistance and water permeability and having a gap formed therein, a solid-liquid separation screen arranged on the water intake side of the core part, and the core part The groundwater storage system of Claim 1 or Claim 2 comprised from the perforated plate for screen protection arrange | positioned in the front side of the said screen for solid-liquid separation by the side. A water tank main body capable of storing groundwater in the ground in an internal space, a solid-liquid separation part installed on a wall cross section of the water tank main body, and a water intake side exposed to the peripheral surface of the water tank main body, and the solid-liquid separation part A water storage tank comprising a water intake mechanism composed of a water intake pipe having one end connected in communication and the other end connected to the internal space of the water tank main body, and a connection connection position of the water intake pipe The groundwater stored in the water storage tank and the cleaning mechanism composed of a cleaning pipe whose one end is connected to the solid-liquid separator and a pumping pump connected to the other end of the cleaning pipe Install water supply facilities that pump and supply water,
The solid-liquid separation screen that constitutes the solid-liquid separation unit by injecting water or hot water through the intake pipe or the washing pipe after the water tank is buried in the ground and before starting operation. And a method for constructing a groundwater storage system, in which a water-soluble sheet sandwiched between a screen-protecting perforated plate disposed on the front surface thereof is melted. A water tank comprising a water tank main body embedded in the ground and capable of storing ground water in the ground in an internal space, and a water intake mechanism installed on a wall section of the water tank main body, and ground water stored in the water tank A water supply facility that pumps and supplies the water to the ground, and the water intake mechanism includes a solid-liquid separation portion whose intake side is exposed on the peripheral surface of the water tank main body, and one end connected to the solid-liquid separation portion. A cleaning pipe having an end connected to the internal space of the water storage tank main body and having one end connected to the solid-liquid separator below the connection position of the water intake pipe, and the cleaning pipe In the method of using a groundwater storage system having a cleaning mechanism composed of a pumping pump connected to the other end of
When storing groundwater, the groundwater flows into the reservoir body through the solid-liquid separator and the intake pipe, and soil particles flowing into the intake mechanism together with the groundwater are blocked by the solid-liquid separator. And
At the time of maintenance, the pump is operated to cause the groundwater stored in the water tank main body to flow backward to the intake pipe, and further into the solid-liquid separation unit, and then from the pump through the washing pipe. By discharging, the soil particles that were blocked by the solid-liquid separation unit and stayed or settled in the space of the solid-liquid separation unit or the surrounding space from the solid-liquid separation unit in the form of being entrained in the reverse flowing groundwater. A method of using the groundwater storage system, wherein the groundwater storage system is removed and discharged to the outside of the system through the cleaning pipe and the pump. A water tank comprising a water tank main body embedded in the ground and capable of storing ground water in the ground in an internal space, and a water intake mechanism installed on a wall section of the water tank main body, and ground water stored in the water tank A water supply facility that pumps and supplies the water to the ground, and the water intake mechanism includes a solid-liquid separation portion whose intake side is exposed on the peripheral surface of the water tank main body, and one end connected to the solid-liquid separation portion. An intake pipe having an end communicating with the internal space of the water storage tank main body and a filtration filter provided at the other end of the intake pipe, and one end of the solid liquid below the connection connection position of the intake pipe A cleaning pipe connected to the separation unit, a pumping pump connected to the other end of the cleaning pipe, a branch pipe branched from the intake pipe and having a tip communicated with the internal space of the water storage tank body, and the branch Equipped with a cleaning mechanism consisting of a check valve attached to the tip of the pipe In the process the use of underground water storage system,
When storing groundwater, the groundwater flows into the reservoir body through the solid-liquid separator, the water intake pipe and the filtration filter, and soil particles that have flowed into the water intake mechanism together with the groundwater are stored in the solid liquid. Shut off by separation part,
During maintenance, after the pump is operated, the groundwater stored in the water tank main body is caused to flow back to the intake pipe through the check valve and the branch pipe, and further flows into the solid-liquid separator. The groundwater that flows back through the soil particles that have been blocked or solidified in the voids of the solid-liquid separation unit or the surrounding space by being discharged from the pumping pump through the washing pipe A method of using a groundwater storage system, wherein the groundwater storage system is removed from the solid-liquid separation part in a form that is entrained in the water and discharged out of the system through the washing pipe and the pump.

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