JP4634492B2 - Underground storage tank - Google Patents

Description

The present invention, by storing the water such as rain water that falls on the ground temporarily, but about the underground storage tank for the purpose of avoiding the risk of flooding swollen river.

Conventionally, in order to suppress the amount of rain water at the time of rainfall peak, an underground storage tank has been buried in a basement such as a school ground (for example, see Patent Document 1).
JP 2006-002504 A (paragraph [0002] column)

  However, this has the following problems.

  First, since the purpose of the underground storage tank is to control the amount of rainwater, the amount of water is taken into consideration, but no measures are taken for water quality. Therefore, the stored water collected in the storage tank body cannot be drained directly (that is, as it is without purification) into a river or the like.

  Secondly, since the pollutant is deposited and accumulated in the main body of the storage tank as the underground storage tank is used, it takes time to process the pollutant.

In view of such circumstances, an object of the present invention is to provide an underground storage tank that can directly drain the stored water in the storage tank main body and that does not require time and effort to treat the pollutant in the storage tank main body. To do.

  In order to achieve such an object, the invention described in claim 1 includes a storage tank body, a water guide portion that guides the inflow water to the inside of the storage tank body, and the inflow water guided by the water guide portion as storage water. The first initial reservoir to be stored, the second initial reservoir that is installed in the first initial reservoir with a partition wall therebetween, and the stored water stored in the first initial reservoir are the second initial reservoir. The overflow weir to overflow, the supernatant reservoir provided in communication with the upper side of the first initial reservoir or the second initial reservoir, and the supernatant water stored in the supernatant reservoir It is characterized by having set it as the underground storage tank provided with the supernatant water discharge means discharged | emitted outside.

  Invention of Claim 2 adds to the structure of Claim 1, and the suspension water which discharges the suspension water stored in the said 1st initial reservoir or the said 2nd initial reservoir to the exterior of the said storage tank main body Discharge means is provided.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, a wash water tank that stores inflow water as wash water is isolated from the first initial reservoir or the second initial reservoir by a partition wall. A water passage hole is provided in the partition wall so as to communicate the washing water tank with the first initial reservoir or the second initial reservoir, and a gate is provided in the water hole so that the gate can be opened and closed. It is characterized by being.

  In addition to the structure in any one of Claims 1 thru | or 3, the said water conveyance part has the drop shaft provided with the spiral flow path.

  According to a fifth aspect of the present invention, in addition to the configuration according to any one of the second to fourth aspects, the plurality of initial reservoirs are connected in series, and the suspended water discharge means is provided for the plurality of initial reservoirs. Among these, it is connected to the initial reservoir to which the said water conveyance part was connected, It is characterized by the above-mentioned.

  According to the first aspect of the present invention, it is possible to drain the supernatant water directly after separating the stored water into suspension water and supernatant water.

  According to invention of Claim 2, since suspended water can be discharged | emitted among stored water, it becomes possible to prepare for the next storage easily.

  According to the invention described in claim 3, since the pollutant can be washed away using the wash water stored in the wash tank, it is possible to treat the pollutant in the storage tank body without taking time and effort. It becomes.

  According to invention of Claim 4, inflow water can be rapidly flowed down, relieving the impact with the floor surface of a drop shaft. Therefore, it is possible to suppress the occurrence of a situation where the inflowing water disturbs the stored water.

  According to the invention described in claim 5, by the method of draining the water that has flowed first, the number of times of cleaning is increased in the initial reservoir having poor water quality, and the cleaning treatment in the storage tank body is effectively performed. It becomes possible.

Embodiments of the present invention will be described below.
Embodiment 1 of the Invention

  1 to 11 show a first embodiment of the present invention.

  First, the configuration will be described.

  The underground storage tank 1 is submerged in the ground by a pneumatic caisson method and has a hexahedral hexagonal storage tank body 2 made of concrete as shown in FIGS. 1 to 5. . As shown in FIGS. 3 to 5, a tapered blade edge 2 a protrudes downward from the peripheral edge of the outer bottom surface of the storage tank body 2.

  In addition, as shown in FIGS. 1 and 5, a first initial reservoir (inflow water reservoir) 5 and a second initial reservoir (inflow water reservoir) 6 are located in the vicinity of the bottom surface inside the storage tank body 2. They are installed side by side across the partition wall 3, and the overflow weir 4 having three predetermined shapes (for example, V-groove shape, U-groove shape, etc.) is recessed in the upper part of the partition wall 3. Yes. And, as shown in FIG. 5, a supernatant reservoir (inflow water reservoir) 7 is provided in communication with the upper side of the first initial reservoir 5 and the second initial reservoir 6. Further, as shown in FIG. 1 to FIG. 3, a washing water tank 9 is provided on the back side of the first initial reservoir 5, the second initial reservoir 6, and the supernatant reservoir 7. It is installed in a form isolated from the initial reservoir 6 by the partition wall 10. As shown in FIGS. 2 and 3, the partition wall 10 has three water holes 11 (first water hole 11A, second water hole 11B, and third water hole 11C). And the second initial reservoir 6 and the washing water tank 9 are penetrated in such a manner that they communicate with each other, and the first water hole 11A, the second water hole 11B, and the third water hole 11C are respectively provided with a first hole. 1 gate 12A, 2nd gate 12B, and 3rd gate 12C are attached so that opening and closing is possible.

  As shown in FIGS. 2 and 3, two drainage inverts 15 </ b> A and 15 </ b> B are provided at the bottom of the first initial reservoir 5 corresponding to the first water hole 11 </ b> A and the second water hole 11 </ b> B. The first water passage hole 11A and the second water passage hole 11B are inclined to each other, and drainage pits 16A and 16B are provided near the lowest points of the inverts 15A and 15B, respectively. Further, the invert walls 15A and 15B are provided with baffle walls 17A and 17B, respectively.

  Similarly, at the bottom of the second initial reservoir 6, as shown in FIG. 2, a drain invert 15 </ b> C is inclined with the third water hole 11 </ b> C as a vertex corresponding to the third water hole 11 </ b> C. The drain pit 16C is provided in the vicinity of the lowest point of the invert 15C. Further, a blocking wall 17C is erected on the invert 15C.

  Further, as shown in FIGS. 2 to 4, the storage tank body 2 is provided with a water guide portion 20 for guiding inflow water from the outside to the inside of the storage tank body 2, and the water guide portion 20 has a cylindrical shape. The inlet 21, the drop shaft 22, and the cylindrical water discharge pipe 23 are formed. Here, as shown in FIG. 3, the inflow port 21 is horizontally installed in the upper part of the side wall of the storage tank body 2 so as to communicate the inside and outside of the storage tank body 2. The drop shaft 22 is installed in the vertical direction so that its upper end communicates with the inflow port 21, and includes a spiral water channel 22 a. The water discharge pipe 23 is installed horizontally toward the first initial reservoir 5 so as to communicate with the lower end of the drop shaft 22.

  Further, as shown in FIGS. 1, 2, and 4, the storage tank body 2 has a drainage section 30 for discharging supernatant water and suspension water from the inside of the storage tank body 2 to the outside (river, treatment plant). The drainage section 30 includes a main drainage pump chamber 31, a main drainage pump (supernatant water discharge means) 32, a suspension water pump chamber 33, and three suspension water pumps (suspension water discharge means) 34 (34A, 34B). 34C). Here, as shown in FIGS. 1 and 4, the main drainage pump chamber 31 is defined at a position higher than the overflow weir 4 in the storage tank body 2, and the main drainage pump 32 is located in the main drainage pump chamber 31. Is installed. As shown in FIGS. 2 and 4, the suspension water pump chamber 33 is defined in the vicinity of the bottom surface in the storage tank body 2, and the suspension water pumps 34 </ b> A, 34 </ b> B, 34 </ b> C are disposed in the suspension water pump chamber 33. The drain pits 16A, 16B, and 16C are respectively connected to the drain pits 16A, 16B, and 16C.

  The effect | action of the underground storage tank 1 which has the above structures is demonstrated.

  When the underground storage tank 1 stores and drains water, the following procedure is used.

  First, in the storing process in the first initial reservoir 5, the first gate 12A and the second gate 12B are closed and the third gate 12C is opened. In this state, when the inflow water flows in from the inflow port 21, as shown in FIG. 6, the inflow water flows down through the drop shaft 22 and is discharged from the water discharge pipe 23 to the first initial reservoir 5. The water level of the first initial reservoir 5 rises.

  At this time, since the water flow path 22a of the drop shaft 22 is spiral, the inflow water is rapidly supplied from the inlet 21 to the water discharge pipe 23 while the impact with the floor surface of the drop shaft 22 is reduced. Become. In addition, since the invert 15A and 15B of the first initial reservoir 5 are provided with the blocking walls 17A and 17B, the inflow water flow can be reduced. As a result, in the first initial reservoir 5, it is possible to suppress the occurrence of a situation where sediment (contaminant) is diffused and mixed with the supernatant water.

  At this time, since the first gate 12A and the second gate 12B are closed, the inflow water does not flow into the washing water tank 9 through the first water hole 11A and the second water hole 11B.

  Thus, when the water level of the first initial reservoir 5 rises and exceeds the overflow weir 4, the process proceeds to the overflow process from the first initial reservoir 5 to the second initial reservoir 6, as shown in FIG. Water overflows the overflow weir 4 from the first initial reservoir 5 and flows into the second initial reservoir 6 (in the direction of arrow F in FIG. 1). Moreover, since the 3rd gate 12C is opening, the water of the 2nd initial reservoir 6 flows into the washing water tank 9 through the 3rd water flow hole 11C, and is stored as washing water. Therefore, the water levels of the second initial reservoir 6 and the wash water tank 9 both rise while maintaining the water level of the first initial reservoir 5.

  At this time, since the invert 15C of the second initial reservoir 6 is provided with the blocking wall 17C, the water flow of the inflowing water can be reduced. As a result, in the second initial reservoir 6, it is possible to suppress the occurrence of a situation in which precipitates (polluting substances) are diffused and mixed with the supernatant water.

  In addition, since the water of the 2nd initial reservoir 5 and the washing water tank 9 are supplied from the uppermost layer of the 1st initial reservoir 5, the water quality is improved from the water of the 1st initial reservoir 5.

  Thus, when the water level of the second initial reservoir 6 and the washing water tank 9 rises and exceeds the overflow weir 4, the process proceeds to a storage process in the supernatant reservoir 7, and water is added to the supernatant reservoir 7 as shown in FIG. 8. At the same time, the cleaning water in the cleaning water tank 9 increases. As a result, both the water levels in the supernatant reservoir 7 and the washing water tank 9 rise.

  Then, when the water levels in the supernatant reservoir 7 and the washing water tank 9 reach the same level as the inlet 21, the third gate 12C is closed and left in this state for a predetermined time (for example, 12 hours or more). . Then, in the storage tank main body 2, the solid fine particles dispersed in water, that is, the pollutant is settled, so that the pollutant is precipitated below the supernatant water and both are separated vertically. And since the supernatant reservoir 7 and the 1st initial reservoir 5 and the 2nd initial reservoir 6 are continuing in the up-and-down direction, the water quality of the supernatant reservoir 7 was improved significantly compared with the inflow water. It becomes a state.

  Next, the process proceeds to the supernatant water draining process. As shown in FIG. 9, the main drainage pump 32 is driven while the third gate 12 </ b> C is closed, and the water in the supernatant reservoir 7 is moved to the outside of the reservoir body 2. After discharging, drain to rivers. At this time, as described above, since the water quality of the supernatant reservoir 7 is greatly improved as compared with the inflow water, it can be drained directly (that is, without being purified).

  At this time, since the third gate 12C is closed, even if the main drain pump 32 is driven, the cleaning water in the cleaning water tank 9 remains accumulated without flowing out, as shown in FIG. 9A. Maintain state.

  Thereafter, the process proceeds to a suspension water draining process, and as shown in FIG. 10, the first suspension reservoir 5 and the second initial reservoir 6 are driven by driving the three suspension water pumps 34 with the third gate 12C closed. After the suspended water is pumped up, it is transported to various treatment plants (not shown) and processed. At this time, since the first initial reservoir 5 and the second initial reservoir 6 are connected in parallel, the suspension water can be drained in a short time.

  At this time, since the third gate 12C is closed, even if the suspension water pump 34 is driven, the washing water in the washing water tank 9 remains accumulated without flowing out as shown in FIG. Maintain the state.

  Next, the process proceeds to a cleaning process (cleaning water draining process), and as shown in FIG. 11, the first gate 12A, the second gate 12B, and the third gate 12C are all opened. Then, the washing water tank 9 communicates with the first initial reservoir 5 through the first water passage hole 11A and the second water passage hole 11B, and to the second initial reservoir 6 through the third water hole 11C. In order to communicate, the wash water in the wash water tank 9 flows down by its own weight, passes through the first water hole 11A, the second water hole 11B, and the third water hole 11C, and the first initial reservoir 5 and the second water. The initial reservoir 6 was expelled vigorously, and the bottoms of the first initial reservoir 5 and the second initial reservoir 6 (invert 15A, 15B, 15C, blocking walls 17A, 17B, 17C) were washed away and polluted by the momentum. After the material is washed away, it is collected and collected in the drain pits 16A, 16B, 16C.

  In this way, in the cleaning process, the pollutant is washed away using the wash water stored in the wash water tank 9, so that the pollutant in the storage tank body 2 can be treated without taking time and effort. Moreover, in order to wash away the pollutant, the potential energy of the cleaning water is converted to kinetic energy by opening the gate 12 (first gate 12A, second gate 12B, and third gate 12C) and allowing the cleaning water to flow under its own weight. It only needs to be converted and does not require a large drive source, so it is economical.

  Finally, by driving the three suspension water pumps 34, the suspension water collected in the drain pits 16A, 16B, and 16C is pumped, and then discharged to various treatment plants (not shown) for processing. As a result, the pollutant in the storage tank body 2 can be eliminated, and the generation of odor can be suppressed.

  Here, the storage / drainage operation in the underground storage tank 1 ends.

  As described above, in the underground storage tank 1, it is possible to drain the supernatant water directly after separating the stored water into the suspended water and the supernatant water. Further, since the suspended water can be discharged, it is possible to easily prepare for the next storage.

Furthermore, since the storage tank main body 2 is a vertical type as described above, a site area necessary for embedding the underground storage tank 2 is small, and the economy is excellent.
[Embodiment 2 of the Invention]

  12 to 15 show a second embodiment of the present invention.

  First, the configuration will be described.

  The underground storage tank 1 is submerged in the ground by a pneumatic caisson method, and has a cylindrical (circular sectional shape) storage tank body 2 made of concrete as shown in FIGS. ing. As shown in FIG. 12, a tapered blade edge 2 a protrudes downward from a peripheral edge portion of the outer bottom surface of the storage tank main body 2.

  Moreover, in the inner peripheral part of the storage tank main body 2, as shown in FIG.12 and FIG.13, the four initial reservoirs (inflow water reservoir) of circular arc shape in the bottom face vicinity, ie, the 1st initial reservoir 5, The second initial reservoir 6, the third initial reservoir 35, and the fourth initial reservoir 36 are sequentially installed on the circumference at equal angular intervals (90 ° intervals) and connected in series.

  Here, between the first initial reservoir 5 and the second initial reservoir 6, as shown in FIGS. 13 and 14, the first partition wall 3 </ b> A is erected so as to separate them from each other, A first overflow weir 4A is recessed in the upper part of the first partition wall 3A. As shown in FIG. 13, a first water passage hole 41 </ b> A is formed in the lower part of the first partition wall 3 </ b> A so as to penetrate the first initial reservoir 5 and the second initial reservoir 6. The first gate 42A is attached to the first water passage hole 41A so as to be freely opened and closed.

  Further, as shown in FIGS. 13 and 14, a second partition wall 3B is erected between the second initial reservoir 6 and the third initial reservoir 35 so as to separate them from each other. A second overflow weir 4B is recessed in the upper part of the two partition walls 3B. As shown in FIG. 13, a second water passage hole 41 </ b> B is formed in the lower part of the second partition wall 3 </ b> B so as to penetrate the second initial reservoir 6 and the third initial reservoir 35. A second gate 42B is attached to the second water passage hole 41B so as to be freely opened and closed.

  Further, as shown in FIGS. 13 and 14, a third partition wall 3C is erected between the third initial reservoir 35 and the fourth initial reservoir 36 so as to separate them from each other. A third overflow weir 4C is recessed in the upper part of the three partition walls 3C. As shown in FIG. 13, a third water passage hole 41 </ b> C is formed in the lower part of the third partition wall 3 </ b> C so as to pass through the third initial reservoir 35 and the fourth initial reservoir 36. A third gate 42C is attached to the third water passage hole 41C so as to be freely opened and closed.

  Furthermore, as shown in FIG. 13, a fourth partition wall 3 </ b> D is erected between the fourth initial reservoir 36 and the first initial reservoir 5 so as to separate them from each other.

  The first overflow weir 4A, the second overflow weir 4B, and the third overflow weir 4C all have the same height.

  The first slope surface 5a at the bottom of the first initial reservoir 5 has the first partition wall 3A side (second initial reservoir 6 side) as the highest point, and the fourth partition wall 3D side (fourth initial reservoir). It is formed so as to be inclined with respect to the horizontal plane with the pond 36 side as the lowest point, and a drainage pit 16 is provided in the vicinity of the lowest point of the first slope surface 5a. In addition, the second slope surface 6a at the bottom of the second initial reservoir 6 has the second partition wall 3B side (third initial reservoir 35 side) as the highest point, and the first partition wall 3A side (first initial reservoir). It is formed so as to be inclined with respect to the horizontal plane with the pond 5 side as the lowest point, and the lowest point of the second slope surface 6a is the same height as the highest point of the first slope surface 5a. Yes. In addition, a third slope surface 35a at the bottom of the third initial reservoir 35 has the third partition wall 3C side (fourth initial reservoir 36 side) as the top point, and the second partition wall 3B side (second initial reservoir). The bottom point of the third slope surface 35a is the same height as the top point of the second slope surface 6a. Yes. Further, a fourth slope surface 36a is formed at the bottom of the fourth initial reservoir 36, with the fourth partition wall 3D side (first initial reservoir 5 side) as the top point, and the third partition wall 3C side (third initial reservoir). It is formed so as to be inclined with respect to the horizontal plane with the pond 35 side) as the lowest point.

  Further, as shown in FIGS. 12 and 15, a supernatant reservoir (inflow water reservoir) 7 having a circular cross section is disposed above the four initial reservoirs.

  Further, as shown in FIG. 12, the water reservoir 20 is attached to the storage tank main body 2, and includes a cylindrical inflow port 21, a drop shaft 22, and a cylindrical water discharge pipe 23. Here, the inflow port 21 is horizontally installed in the upper part of the side wall of the storage tank main body 2 so as to communicate the inside and outside of the storage tank main body 2. The drop shaft 22 is installed in the vertical direction so that its upper end communicates with the inflow port 21, and includes a spiral water channel 22 a. As shown in FIG. 13, the water discharge pipe 23 is installed horizontally toward the first initial reservoir 5 so as to communicate with the lower end portion of the drop shaft 22.

  Further, as shown in FIGS. 12 to 15, a drainage part 30 is attached to the central part of the storage tank main body 2 so as to be surrounded by four initial storage ponds. It comprises a pump chamber 31, a main drain pump (supernatant water discharge means) 32, a suspension water pump chamber 33, and a suspension water pump (suspension water discharge means) 34. Here, as shown in FIG. 12, the main drainage pump chamber 31 is defined at a position higher than the first overflow weir 4 </ b> A, and the main drainage pump 32 is installed in the main drainage pump chamber 31. The suspension water pump chamber 33 is defined in the vicinity of the bottom surface of the storage tank body 2, and the suspension water pump 34 is connected to the drain pit 16 and eventually the first initial reservoir 5 (that is, the initial stage to which the water conduit 20 is connected). It is installed in the suspension water pump chamber 33 so as to be connected to the reservoir.

  The effect | action of the underground storage tank 1 which has the above structures is demonstrated.

  When the underground storage tank 1 stores and drains water, the following procedure is used.

  First, in the storing process in the first initial reservoir 5, the first gate 42A, the second gate 42B, and the third gate 42C are all closed. In this state, when inflowing water flows in from the inflow port 21, the inflowing water flows down through the drop shaft 22 and is discharged from the water discharge pipe 23 to the first initial reservoir 5. The water level rises.

  Thus, when the water level of the first initial reservoir 5 rises and exceeds the first overflow weir 4A, the process proceeds to the overflow process from the first initial reservoir 5 to the second initial reservoir 6, and the first initial reservoir Since the supernatant water of 5 overflows the first overflow weir 4A and flows into the second initial reservoir 6, the water level of the second initial reservoir 6 rises while the water level of the first initial reservoir 5 does not increase. Go.

  Thus, when the water level of the second initial reservoir 6 rises and exceeds the second overflow weir 4B, the process proceeds to the overflow process from the second initial reservoir 6 to the third initial reservoir 35, and the second initial reservoir Since the supernatant water of 6 overflows the second overflow weir 4B and flows into the third initial reservoir 35, the water level of the first initial reservoir 5 and the second initial reservoir 6 does not increase, and the third initial reservoir The water level of 35 rises.

  Thus, when the water level of the third initial reservoir 35 rises and exceeds the third overflow weir 4C, the process proceeds to the overflow process from the third initial reservoir 35 to the fourth initial reservoir 36, and the third initial reservoir Since the supernatant water of 35 flows over the third overflow weir 4C and flows into the fourth initial reservoir 36, the water level of the first initial reservoir 5, the second initial reservoir 6 and the third initial reservoir 35 does not increase. As it is, the water level of the fourth initial reservoir 36 rises.

  Thus, the influent water is improved every time it passes through the first overflow weir 4A, the second overflow weir 4B, and the third overflow weir 4C, so that the water in the fourth initial reservoir 36 has the highest water quality. The water in the third initial reservoir 35 has the second highest quality, the water in the second initial reservoir 6 has the third highest quality, and the water in the first initial reservoir 5 has the worst quality.

  Thus, when the water level of the fourth initial reservoir 36 rises and exceeds the third overflow weir 4 </ b> C, the process proceeds to the storage process to the supernatant reservoir 7, and water begins to accumulate in the supernatant reservoir 7. The water level rises.

  Then, when the water level of the supernatant reservoir 7 reaches the same level as the inlet 21, the supply of the inflowing water is stopped and left in this state for a predetermined time (for example, 12 hours or more). Then, in the storage tank main body 2, the solid fine particles dispersed in water, that is, the pollutant is settled, so that the pollutant is precipitated below the supernatant water and both are separated vertically. Since the supernatant reservoir 7 and the four initial reservoirs are continuous in the vertical direction, the water in the supernatant reservoir 7 is in a state in which the water quality has been significantly improved compared to the inflow water.

  Next, the process proceeds to the supernatant water draining process, and the main drain pump 32 is driven to discharge the water in the supernatant reservoir 7 to the outside of the storage tank body 2 and then drain to the river or the like. At this time, as described above, since the water quality of the supernatant reservoir 7 is greatly improved as compared with the inflow water, it can be drained directly (that is, without being purified).

  Then, it transfers to a suspension water drainage process and drains suspension water in four steps (the 1st drainage process, the 2nd drainage process, the 3rd drainage process, and the 4th drainage process).

  First, in the first drainage process, the suspension water pump 34 is driven in a state where the first gate 42A, the second gate 42B, and the third gate 42C are all closed. Then, the suspended water in the first initial reservoir 5 is pumped from the drain pit 16 and then carried out to various processing plants (not shown) for processing. At this time, since the first slope surface 5a is formed at the bottom of the first initial reservoir 5, the suspended water can be quickly drained.

  Next, in the second drainage step, the first gate 42A is opened and the suspension water pump 34 is driven. Then, since the second initial reservoir 6 is in communication with the first initial reservoir 5 via the first water passage hole 41A, the suspended water in the second initial reservoir 6 passes through the first water passage hole 41A. After flowing into the first initial reservoir 5, the water is pumped from the drain pit 16 and then discharged to various treatment plants (not shown) for processing. At this time, since the 2nd slope surface 6a and the 1st slope surface 5a are formed in the bottom part of the 2nd initial reservoir 6 and the 1st initial reservoir 5, respectively, suspension water can be drained quickly. At this time, since the second gate 42B and the third gate 42C remain closed, the suspended water in the third initial reservoir 35 and the fourth initial reservoir 36 maintains the storage state.

  Next, in the third drainage step, the second gate 42B is opened while the first gate 42A is opened, and the driving of the suspension water pump 34 is continued. Then, since the third initial reservoir 35 is in communication with the second initial reservoir 6 through the second water hole 41B, the suspended water in the third initial reservoir 35 passes through the second water hole 41B. After flowing into the second initial reservoir 6, after flowing into the first initial reservoir 5 through the first water passage hole 41 </ b> A, the water is pumped from the drain pit 16, and then discharged to various treatment plants (not shown). Is processed. At this time, a third slope surface 35a, a second slope surface 6a, and a first slope surface 5a are formed at the bottoms of the third initial reservoir 35, the second initial reservoir 6, and the first initial reservoir 5, respectively. Therefore, the suspended water can be drained quickly. At this time, since the third gate 42C remains closed, the suspended water in the fourth initial reservoir 36 maintains the storage state.

  Finally, in the fourth draining step, the third gate 42C is opened while the first gate 42A and the second gate 42B are opened, and the driving of the suspension water pump 34 is continued. Then, the fourth initial reservoir 36 is in communication with the third initial reservoir 35 through the third water hole 41C, so that the suspended water in the fourth initial reservoir 36 passes through the third water hole 41C. After flowing into the third initial reservoir 35 and further flowing into the second initial reservoir 6 through the second water passage hole 41B and then into the first initial reservoir 5 through the first water hole 41A, the drainage After being pumped from the pit 16, it is carried out to various processing sites (not shown) and processed. At this time, a fourth slope surface 36a, a third slope surface 35a, and a second slope are provided at the bottoms of the fourth initial reservoir 36, the third initial reservoir 35, the second initial reservoir 6, and the first initial reservoir 5, respectively. Since the surface 6a and the first slope surface 5a are formed, the suspended water can be drained quickly.

  Here, the storage / drainage operation in the underground storage tank 1 ends.

  As described above, in the underground storage tank 1, it is possible to drain the supernatant water directly after separating the stored water into the suspended water and the supernatant water. Further, since the suspended water can be discharged, it is possible to easily prepare for the next storage.

In addition, in the draining operation of the suspended water, the water in the first initial reservoir 5 into which the inflow water first flows is drained first, and the water in the second initial reservoir 6 into which the inflow water flows second is the second. The water in the third initial reservoir 35 into which the inflow water flows in third is drained in the third, and the water in the fourth initial reservoir 36 in which the inflow water flows in last is drained last. Therefore, the number of washings increases as the initial reservoirs 5, 6, 35, and 36 with poor water quality. That is, for the fourth initial reservoir 36 having the best water quality, the number of washings is one (fourth drainage process), and for the third initial reservoir 35 having a slightly poor water quality, the number of washings is two (third drainage). Process, fourth drainage process). Moreover, about the 2nd initial reservoir 6 with worse water quality, the frequency | count of washing | cleaning will be 3 times (a 2nd drainage process, a 3rd drainage process, a 4th drainage process), and about the 1st initial reservoir 5 with the worst water quality The number of washings is 4 times (first drainage process, second drainage process, third drainage process, fourth drainage process). Therefore, it becomes possible to perform the cleaning process in the storage tank main body 2 effectively.
[Other Embodiments of the Invention]

  In addition, although Embodiment 1 and 2 mentioned above demonstrated the underground storage tank 1 provided with the water guide part 20 which has the inflow port 21, you may attach a baffle wall and a screen to this inflow port 21. FIG. In this case, it is possible to reduce the water flow of the inflowing water and to prevent the inflow of foreign matter by the baffle wall or the screen.

  Moreover, although Embodiment 1 and 2 mentioned above demonstrated the underground storage tank 1 provided with the water guide part 20 which has the drop shaft 22, it replaced with the drop shaft 22, and inflow water flowing-down means (such as a staircase system or a ramp) ( (Not shown) may be employed.

  Moreover, although Embodiment 1 and 2 mentioned above demonstrated the underground storage tank 1 submerged in the ground by the pneumatic caisson method, this invention is applied to the underground storage tank 1 buried underground by methods other than this. Of course, it can also be applied.

  Moreover, in Embodiment 1 mentioned above, the underground storage tank 1 provided with two initial reservoirs (1st initial reservoir 5 and 2nd initial reservoir 6) is demonstrated, and in Embodiment 2 mentioned above, 4 The underground reservoir 1 having two initial reservoirs (the first initial reservoir 5, the second initial reservoir 6, the third initial reservoir 35, and the fourth initial reservoir 36) has been described. Any number can be used as long as it is plural (two or more).

  Moreover, in Embodiment 1 mentioned above, the underground storage tank 1 which has the hexahedral storage tank main body 2 is demonstrated, In Embodiment 2 mentioned above, the underground storage tank 1 which has the cylindrical storage tank main body 2 is demonstrated. However, the storage tank main body 2 provided with other shapes (for example, hexagonal cylinder shape, octagonal cylinder shape, etc.) can also be substituted.

  Moreover, in Embodiment 1 mentioned above, when washing away the pollutant, a method in which the wash water in the wash water tank 9 is caused to flow down by its own weight is adopted, but the pollutant may be washed away by other methods. .

  Moreover, although Embodiment 2 mentioned above demonstrated the underground storage tank 1 in which four initial reservoirs were installed on the circumference and connected in series, these initial reservoirs are not necessarily installed on the circumference. It is not necessary, for example, it can be installed in an S shape or lightning. Also in this case, as long as these initial reservoirs are connected in series, the number of washings is increased in the initial reservoir with poor water quality by the method of draining the water that has flowed in first. The cleaning process can be performed effectively.

  Further, in the above-described second embodiment, the case where the first overflow weir 4A, the second overflow weir 4B, and the third overflow weir 4C are all the same height has been described. Can be slightly higher than the second overflow weir 4B, and the second overflow weir 4B can be slightly higher than the third overflow weir 4C. In this case, since the first overflow weir 4A is slightly higher than the second overflow weir 4B, the water in the second initial reservoir 6 having better water quality than the first initial reservoir 5 will pass through the first overflow weir 4A. The problem of overflowing and backflowing into the first initial reservoir 5 can be avoided. Further, since the second overflow weir 4B is slightly higher than the third overflow weir 4C, the water in the third initial reservoir 35 having better water quality than the second initial reservoir 6 crosses the second overflow weir 4B. It is possible to avoid the problem of flowing and flowing back to the second initial reservoir 6.

  The present invention can be widely applied to various fields such as rainwater purification drainage equipment and water purification plant facilities.

It is the 1st horizontal sectional view (horizontal sectional view which passes an initial stage reservoir) which shows the underground storage tank concerning Embodiment 1 of the present invention. It is a 2nd horizontal sectional view (horizontal sectional view which passes a supernatant water reservoir) which shows an underground storage tank concerning the embodiment 1. It is a vertical sectional view by the III-III line of the underground storage tank shown in FIG. It is a vertical sectional view by the IV-IV line of the underground storage tank shown in FIG. It is a vertical sectional view by the VV line of the underground storage tank shown in FIG. It is a figure which shows the storage process to a 1st initial reservoir, Comprising: (a) is a vertical sectional view by the III-III line of an underground storage tank, (b) is a vertical sectional view by the VV line of an underground storage tank. is there. It is a figure which shows the overflow process from a 1st initial reservoir to a 2nd initial reservoir, (a) is vertical sectional drawing by the III-III line of an underground storage tank, (b) is V- of an underground storage tank. It is a vertical sectional view by V line. It is a figure which shows the storage process to a supernatant reservoir, Comprising: (a) is a vertical sectional view by the III-III line of an underground storage tank, (b) is a vertical sectional view by the VV line of an underground storage tank. It is a figure which shows the drainage process of supernatant water, Comprising: (a) is a vertical sectional view by the III-III line of an underground storage tank, (b) is a vertical sectional view by the VV line of an underground storage tank. It is a figure which shows the drainage process of suspension water, Comprising: (a) is a vertical sectional view by the III-III line of an underground storage tank, (b) is a vertical sectional view by the VV line of an underground storage tank. It is a figure which shows a washing | cleaning process (washing water drainage process), Comprising: (a) is a vertical sectional view by the III-III line of an underground storage tank, (b) is a vertical sectional view by the VV line of an underground storage tank. is there. It is a vertical sectional view showing an underground storage tank according to Embodiment 2 of the present invention. It is a vertical sectional view by the XIII-XIII line of the underground storage tank shown in FIG. It is a vertical sectional view by the XIV-XIV line of the underground storage tank shown in FIG. It is a vertical sectional view by the XV-XV line of the underground storage tank shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Underground storage tank 2 ... Storage tank main body 2a ... Cutting edge 3, 3A, 3B, 3C, 3D ... Partition wall 4, 4A, 4B, 4C ... Overflow weir 5 ... First initial reservoir (Inflow water reservoir)
5a …… First slope surface 6 …… Second initial reservoir (inflow water reservoir)
6a …… Second slope surface 7 …… Supernatant reservoir (inflow water reservoir)
9 ... Washing water tank 10 ... Partition 11A ... First water hole 11B ... Second water hole 11C ... Third water hole 12A ... First gate (gate)
12B …… Second gate (gate)
12C …… 3rd gate (gate)
15A, 15B, 15C ... Invert 16, 16A, 16B, 16C ... Drainage pits 17A, 17B, 17C ... Baffle walls 20 ... Conveyance section 21 ... Inlet 22 ... Drop shaft 22a ... Flow channel 23 …… Discharge pipe 30 …… Drainage section 31 …… Main drain pump room 32 …… Main drain pump (supernatant water discharge means)
33 ... Suspension water pump chamber 34, 34A, 34B, 34C ... Suspension water pump (suspension water discharge means)
35 …… The third initial reservoir (inflow water reservoir)
35a …… Third slope surface 36 …… Fourth initial reservoir (inflow water reservoir)
36a …… Fourth slope surface 41A …… First water passage hole 41B …… Second water passage hole 41C …… Third water passage hole 42A …… First gate 42B …… Second gate 42C …… Third gate

Claims (5)

  The storage tank main body, a water guide part that guides the inflow water to the inside of the storage tank main body, a plurality of initial reservoirs that store the inflow water guided by the water guide part as stored water, and the initial reservoirs are separated from each other A partition wall, an overflow dam provided at the top of the partition wall, a supernatant reservoir provided in communication with the upper side of the initial reservoir, and a supernatant water stored in the supernatant reservoir An underground storage tank comprising a supernatant water discharging means for discharging to the outside.   The underground storage tank according to claim 1, further comprising suspension water discharge means for discharging the suspended water stored in the initial storage pond to the outside of the storage tank main body. A washing water tank for storing inflow water as washing water is provided in a form separated from the initial reservoir by a partition wall,
A water passage hole is provided in the partition so as to communicate the washing water tank and the initial reservoir.
The underground storage tank according to claim 1, wherein a gate is provided in the water passage hole so as to be freely opened and closed.   The underground water storage tank according to any one of claims 1 to 3, wherein the water guide section includes a drop shaft provided with a spiral flow channel. The plurality of initial reservoirs are connected in series,
The underground storage tank according to any one of claims 2 to 4, wherein the suspended water discharging means is connected to an initial reservoir to which the water conveyance section is connected among the plurality of initial reservoirs .

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