JP2006348476A - Rainwater storage equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively suppress the inflow of sediment etc. into a rainwater storage material made of a resin, which occurs during the use of the rainwater storage material made of the resin, while enabling rainwater storage equipment to be installed by being buried with a little labor in the ground in a short construction period through the use of rainwater storage material made of the resin. <P>SOLUTION: The rainwater storage equipment S constructed by being buried in the ground comprises: a primary storage tank 1 which can be formed by annularly arranging a box culvert 1a as a tubular concrete product, and which communicates with an outflow pipe 1y for discharging the rainwater from an inflow pipe 1x for introducing the rainwater into an internally formed storage space 1s and an outflow pipe 1y for discharging the rainwater from the storage space 1s; a secondary storage tank 2 which is formed in a space, surrounded by the primary storage tank 1, by using the rainwater storage material 21 made of the resin; and an outflow/inflow control means 3 for temporarily storing the rainwater, exceeding the storage capacity of the primary storage tank 1, in the secondary storage tank 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rainwater storage device that stores rainwater before it is discharged into sewage or a river.

  In recent years, due to the progress of road paving, etc., rainwater is discharged directly into the sewage and rivers without penetrating the ground, which causes a significant increase in rivers and sewage, which tends to cause inundation damage. is doing.

In response to the occurrence of such a situation, it is considered that a rainwater storage device composed of concrete products is buried in the ground, and rainwater is temporarily stored in this rainwater storage device and then discharged into sewage and rivers. . (For example, see Patent Document 1.)
In addition, as a rainwater storage device that stores rainwater before it is discharged into sewage or rivers, a device that is formed using a resin rainwater storage material and embedded in the ground is also considered. (For example, see Patent Document 2)
Japanese Patent No. 2543667 JP 2005-2620 A

  In the configuration described in Patent Document 1, concrete is cast to form a bottom plate, and a wall member and a column member, which are concrete products, are fixed on the bottom plate, and then between the wall member and the column member and the column. A beam member, which is a concrete product, is placed between the members, and a floor member, which is a concrete product that forms the top surface of the rainwater storage device, is placed on the beam member, and concrete is placed between the beam members. Thus, a rainwater storage device is formed. Therefore, since the backfilling can be performed only after the concrete cast in the portion between the beam members is hardened, the construction period is increased accordingly.

  On the other hand, when the configuration described in Patent Document 2 is adopted, the rainwater storage device is waterproof to the side so that earth and sand do not enter the rainwater storage device and the stored rainwater does not escape to the side. It is necessary to provide a sheet. That is, it takes time to provide this waterproof sheet. Furthermore, since the resin-made rainwater storage material is lightweight, the resin-made rainwater storage material may shift with the passage of time, and the malfunction of the rainwater storage device may occur. Moreover, when the said waterproof sheet breaks with progress of years, earth and sand invades from a broken location, and the malfunction which the function of a rainwater storage apparatus falls may also arise.

  The present invention is configured to solve such problems.

  That is, the rainwater storage device according to the present invention is embedded in the ground, and is an inflow pipe for introducing rainwater into a storage space formed inside by forming a cylindrical concrete product in an annular shape. And a primary storage tank communicating with an outflow pipe for discharging rainwater from the storage space, a secondary storage tank formed by using a resin rainwater storage material in a space surrounded by the primary storage tank, and the primary And an inflow / outflow control means for temporarily storing rainwater exceeding the storage capacity of the storage tank in the secondary storage tank.

  If this is the case, the secondary storage tank formed using the resin rainwater storage material is arranged in a space surrounded by the primary storage tank formed by arranging the cylindrical concrete products in an annular shape. Therefore, intrusion of earth and sand and lateral rainwater into the secondary storage tank is prevented by the primary storage tank, and it is not necessary to provide a water shielding sheet on the side of the secondary storage tank, and the secondary storage tank is lightweight. Since it is comprised with the resin-made rainwater storage material, the setup of a secondary storage tank can be performed with little effort, without using a special machine. Furthermore, since the primary storage tank is formed using a cylindrical concrete product, the cylindrical concrete product for forming the primary storage tank is manufactured in advance at a factory or the like, and then such a cylindrical concrete is on-site. A construction method for embedding the product can be adopted, and furthermore, the backfilling operation of the primary storage tank and the construction of the secondary storage tank can be performed in parallel, so that the construction period can be shortened.

  In addition, as another rainwater storage device according to the present invention, it is embedded in the ground, and is formed by arranging cylindrical concrete products in a linear shape, and rainwater is stored in a storage space formed inside. A secondary storage space between an inflow pipe to be introduced and a primary storage tank communicating with an outflow pipe for discharging rainwater from the storage space, and a concrete product adjacent to the primary storage tank. A secondary storage tank formed by using a resin rainwater storage material disposed in the secondary storage space, and the secondary rainwater that exceeds the storage capacity of the primary storage tank. What is characterized by comprising an inflow / outflow control means for temporarily storing in a storage tank.

  Even if it is such, it is formed between the primary storage tank formed by arranging the cylindrical concrete product in a line and the wall portion formed by arranging the concrete product adjacent to the primary storage tank. Since a secondary storage tank is formed by arranging resin rainwater storage material in the secondary storage space, intrusion of earth and sand and lateral rainwater into the secondary storage tank is caused by the primary storage tank and walls. Be blocked. Accordingly, it is not necessary to provide a water shielding sheet on the side of the secondary storage tank, and the wall portion is a concrete product that can form a secondary storage space with the primary storage tank. Since the secondary storage tank is made of lightweight resin rainwater storage material, the wall and the secondary storage tank must be set up with little effort without using a special machine. Can do. Furthermore, since the primary storage tank is formed using a cylindrical concrete product, the cylindrical concrete product for forming the primary storage tank is manufactured in advance at a factory or the like, and then such a cylindrical concrete is on-site. The method of embedding the product can be adopted, and the backfilling of such a cylindrical concrete product and the construction of the wall and the secondary storage tank 2 can be performed in parallel, so that the construction period can be shortened. it can. In the present invention, “arranging the cylindrical concrete product in a line” means not only an aspect in which the cylindrical concrete product is arranged in a straight line, but also a part of the outer periphery of the secondary storage space formed in a predetermined region. This is a concept including, for example, arranging a cylindrical concrete product in an L shape, a U shape, a semicircular shape, a V shape, an annular shape with a part opened, or the like. .

  As a specific configuration for temporarily storing rainwater exceeding the storage capacity of the primary storage tank in the secondary storage tank, the inflow / outflow control means communicates the primary storage tank and the secondary storage tank. And a check valve that is located below the intermediate inlet and discharges water stored in the secondary storage tank to the primary storage tank. If this is the case, during heavy rain, that is, when the amount of storage in the primary storage tank is large, rainwater is introduced from the intermediate inlet to the secondary storage tank, and when the amount of storage in the primary storage tank is small This is because the secondary storage tank can be drained to the primary storage tank via the check valve.

  On the other hand, as a specific aspect for allowing rainwater to be temporarily stored in the primary storage tank during light rain, etc., and for allowing rainwater to be discharged from the primary storage tank when there is no rainfall, the primary storage tank is Between the inflow part facing the inflow pipe, the spillway discharging part facing the outflow pipe, the storage part located between the inflow part and the spillage discharging part, and between the storage part and the spillage discharging part And an outflow amount control means arranged in the above.

  Furthermore, as a specific configuration of the outflow amount control means, the outflow amount control means includes an overflow wall provided upright inside the cylindrical concrete product, and a small discharge port formed in the lower portion of the overflow wall. The thing which comprises is mentioned. If this is the case, rainwater can be stored in the reservoir until the water surface reaches the upper end of the overflow wall during rainfall, and rainwater stored in the reservoir can be discharged from the small outlet when there is no rain. It is.

  In order to prevent floating substances such as fallen leaves and dust from entering the primary storage tank, the floating substance flows into the storage section between the inflow section and the storage section of the primary storage tank. It is desirable to provide a floating removal wall to prevent.

  In order to prevent sediment such as earth and sand from mixing into the water stored in the primary storage tank and the secondary storage tank, the primary storage tank is provided with a sediment storage section for storing the sediment. It is desirable.

  As a configuration for facilitating maintenance on the primary storage tank, there is a configuration in which a management hole through which a person performing management can pass is provided on the upper surface of the primary storage tank.

  The rainwater storage device according to the present invention is a space surrounded by a primary storage tank formed by arranging a cylindrical concrete product in a ring shape, or a cylinder, which is a secondary storage tank formed by using a resin rainwater storage material. Because it is arranged in a secondary storage space formed between a primary storage tank formed by arranging linear concrete products in a linear form and a wall portion provided by arranging a concrete product adjacent to the primary storage tank Intrusion of rain and sand from the side and the side of the secondary storage tank is prevented by the wall when the primary storage tank and the wall are provided, and it is necessary to provide a water shielding sheet on the side of the secondary storage tank In addition, since the secondary storage tank is made of a lightweight resin rainwater storage material, the secondary storage tank can be set up with little effort without using a special machine. Furthermore, since the primary storage tank is formed using a cylindrical concrete product, the cylindrical concrete product for forming the primary storage tank is manufactured in advance at a factory or the like, and then such a cylindrical concrete is on-site. A construction method for embedding the product can be adopted, and furthermore, the backfilling operation of the primary storage tank and the construction of the secondary storage tank can be performed in parallel, so that the construction period can be shortened.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  The rainwater storage device S according to the present embodiment is embedded in the ground as schematically shown in FIG. 1 and FIG. 1 and in FIG. 2 and FIG. 3, respectively. An inflow pipe 1x for introducing rainwater into a storage space 1s formed inside a box culvert 1a, which is a cylindrical concrete product, formed in an annular shape, and rainwater from the storage space 1s. A primary storage tank 1 communicating with the discharge pipe 1y to be discharged, a secondary storage tank 2 formed by using a resin rainwater storage material 21 in a space surrounded by the primary storage tank 1, and the primary storage tank And an inflow / outflow control means 3 for temporarily storing rainwater exceeding the storage capacity of 1 in the secondary storage tank 2.

  Specifically, the primary storage tank 1 faces the inflow pipe 1x, faces the inflow section 4 located at the corner of the primary storage tank 1, and the outflow pipe 1y, and is diagonal to the inflow section 4 A spillway 5 located at a corner, a reservoir 6 positioned between the inflow part 4 and the spillway 5, and between the reservoir 6 and the spillway 5. The flow rate control means 7 is provided and is formed in a rectangular shape in plan view. Further, the connection between the box culverts 1a forming the primary storage tank 1 is performed by a known method, for example, a method described in JP-A-2005-2657.

  Here, a floating substance removal wall 41 is provided between the inflow part 4 and the storage part 6 of the primary storage tank to prevent inflow of floating substances into the storage part 6. Specifically, the suspended matter removing wall 41 is provided so as to hang down from the top plate of the box culvert 1a at the corresponding location. Further, in the primary storage tank 1, a through hole 1k is formed in a side wall of the box culvert 1a at a corresponding portion at a corner where the inflow portion 4 and the storage portion 6 are not provided, and a space inside the box culvert 1a. They communicate with each other.

  Further, the outflow amount control means 7 includes an overflow wall 71 provided upright inside the box culvert 1a from the bottom plate of the box culvert 1a at the boundary between the reservoir 6 and the spillway 5; There is provided an orifice 7x which is a small discharge port formed at a lower portion of the overflow wall 71, preferably at a height near the bottom surface of the storage space 1s.

  On the other hand, the secondary storage tank 2 is formed using the resin rainwater storage material 21 as described above. That is, the secondary storage tank 2 is formed using a resin rainwater storage material having the same configuration as the resin rainwater storage material described in Patent Document 2. More specifically, the resin rainwater storage material 21 is shown in a perspective view in FIG. 4, a plan view in FIG. 5A, a side view in FIG. 5B, and a front view in FIG. As shown, the projections 21a are substantially square in plan view and are arranged at equal intervals along the sides, and have water passage holes 21b near the upper ends of the projections 21a. The secondary storage tank 2 is formed by stacking the resin rainwater storage material 21 in multiple layers. In the resin rainwater storage material 21 of the same layer, the protrusions 21a are all directed in the same direction, and the resin rainwater storage material 21 is arranged without a gap for each layer. The protrusions 21a of the layers adjacent to each other in the vertical direction are directed in different directions, as schematically shown in FIG.

  The inflow / outflow control means 3 is located in an intermediate inlet 3x communicating with the primary storage tank 1 and the secondary storage tank 2, and is located below the intermediate inlet 3x and stored in the secondary storage tank 2. And a check valve 3y for discharging the water to the primary storage tank 1.

  The intermediate inlet 3x is provided at the center of each side of the primary storage tank 1 formed by arranging the box culvert 1a in a rectangular shape, and the height position of the intermediate inlet 3x is the lower end thereof. Near the upper end of the overflow wall 71, its upper end is set above the overflow wall 71, and only when the water level in the primary storage tank 1 reaches the vicinity of the upper end of the overflow wall 71 It introduces into the secondary storage tank 2.

  In addition, the primary storage tank 1 is provided with a sediment storage unit 1t that stores the sediment at a position below the intermediate inlet 3x. In the present embodiment, the sediment storage portion 1t is configured such that the height dimension of the box culvert 1a at the corresponding portion of the primary storage tank 1 is increased, and the bottom plate of the box culvert 1a is lower than the bottom plates of the other box culverts 1a. In this box culvert 1a, the sediment is stored in a portion below the bottom plate of the other box culvert 1a. In addition, you may provide the sediment storage part 1t in any site | part of the storage part 6. FIG.

  In addition, in the present embodiment, a management hole 1z through which a person performing management can pass is provided on the upper surface of the primary storage tank 1.

  Such a rainwater storage device S is set up by the following procedure, for example.

  First, the box culvert 1a for forming the primary storage tank 1 is formed in advance.

  Next, a hole is dug in a place where the rainwater storage device S is installed to form a foundation concrete layer.

  Then, the box culverts 1 a are arranged along the outer periphery of the rainwater storage device S and connected to each other to form the primary storage tank 1.

  Then, the primary storage tank 1 is backfilled, and the resin rainwater storage material 21 is sequentially disposed in the space surrounded by the primary storage tank 1 to form the secondary storage tank 2, and finally the secondary storage tank. Backfill 2

  Further, when rainwater flows into the rainwater storage device S, the rainwater is introduced into the rainwater storage device S as follows.

  First, rainwater is introduced into the inflow portion 4 of the primary storage tank 1 from the inflow pipe 1x. Floating matter such as fallen leaves and dust mixed in the rainwater introduced into the inflow portion 4 is blocked by the floating matter removing wall 41, and the rainwater is guided to the storage portion 6.

  The rainwater guided to the storage unit 6 flows toward the overflow wall 71, and sediment such as earth and sand is stored in the sediment storage unit 1t in the process.

  When the water level does not reach the lower end of the intermediate inlet 3x, rainwater is stored only in the storage section 6 of the primary storage tank 1. On the other hand, when the water level reaches the lower end of the intermediate inlet 3x, rainwater is introduced into the secondary storage tank 2 from the intermediate inlet 3x. On the other hand, water is discharged from the inside of the storage part 6 of the primary storage tank 1 to the remaining water discharge part 5 through the orifice 7 x of the outflow amount control means 7. Further, when the water level reaches the upper end of the overflow wall 71, water is discharged from above the overflow wall 71 through the spillway 5 to the outflow pipe 1y.

  When the amount of water introduced into the rainwater storage device S from the inflow pipe 1x decreases, first, water is discharged from the inside of the storage section 6 of the primary storage tank 1 through the orifice 7x of the outflow amount control means 7. The water discharged to the part 5 and discharged to the remaining water discharge part 5 is further discharged to the outflow pipe 1y. And when the water level in the storage part 6 falls below the check valve 3y of the inflow / outflow control means 3, if the rainwater is stored in the secondary storage tank 2, the secondary storage tank 2 Rainwater stored inside is discharged from the check valve 3y toward the storage section 6 of the primary storage tank 1. The water discharged from the secondary storage tank 2 to the storage section 6 of the primary storage tank 1 is the same as the water originally stored in the storage section 6 of the primary storage tank 1, and the orifice 7x and the remaining water discharge. It is discharged to the outflow pipe 1y via the part 5.

  Since the rainwater storage device S according to the present embodiment is configured as described above, the following effects can be obtained by using the rainwater storage device S.

  That is, since the secondary storage tank 2 formed using the resin rainwater storage material 21 is arranged in a space surrounded by the primary storage tank 1 formed by arranging the box culverts 1a in an annular shape, Intrusion of earth and sand and rainwater from the side into the secondary storage tank 2 is prevented by the primary storage tank 1, eliminating the need to provide a water shielding sheet on the side of the secondary storage tank 2 and making the secondary storage tank 2 lightweight. Since it is comprised with the resin-made rainwater storage material 21, it can perform the setup of the secondary storage tank 2 with little effort, without using a special machine. Further, since the primary storage tank 1 is formed using the box culvert 1a, the box culvert 1a for forming the primary storage tank 1 is manufactured in advance in a factory or the like, and then such a box culvert 1a is installed on the site. In addition, since the backfilling operation of the primary storage tank 1 and the construction of the secondary storage tank 2 can be performed in parallel, the construction period can be shortened.

  The inflow / outflow control means 3 has an intermediate inlet 3x communicating the primary storage tank 1 and the secondary storage tank 2, and water stored below the intermediate inlet 3x and stored in the secondary storage tank 2 And a check valve 3y that discharges the primary storage tank 1 into the primary storage tank 1, so that rainwater is introduced into the secondary storage tank 2 from the intermediate inlet 3x during heavy rain, that is, when the storage amount in the primary storage tank 1 is large When the amount of storage in the primary storage tank 1 is small, the secondary storage tank 2 is drained from the secondary storage tank 2 to the primary storage tank 1 via the check valve 3y. Rainwater exceeding the storage capacity of the primary storage tank 1 can be temporarily stored.

  The primary storage tank 1 is located between the inflow part 4 facing the inflow pipe 1x, the spillage discharging part 5 facing the outflow pipe 1y, and the storage part 6 located between the inflow part 4 and the spillage discharge part 5. And an outflow amount control means 7 disposed between the storage section 6 and the spillway discharge section 5, so that the outflow amount control means 7 temporarily stores the storage section 6 in a light rain or the like. Rainwater is stored, and rainwater can be discharged from the storage unit 6 when there is no rainfall or the like.

  Further, since the outflow control means 7 includes an overflow wall 71 provided upright inside the box culvert 1a and an orifice 7x formed in the lower portion of the overflow wall 71, the water surface will overflow during rainfall. Rainwater is stored in the storage unit 6 until the upper end of the flow wall 71 is reached, and when there is no rainfall, the rainwater stored in the storage unit 6 is discharged from the orifice 7x to reduce the amount of water in the storage unit 6 By doing so, the amount of water inside the reservoir 6 can be adjusted.

  Between the inflow part 4 and the storage part 6 of the primary storage tank 1, the floating substance removal wall 41 that prevents the inflow of floating substances into the storage part 6 is provided, so that the inside of the primary storage tank 1 It is possible to prevent floating substances such as fallen leaves and garbage from entering.

  Since the primary storage tank 1 is provided with the sediment storage part 1t for storing the sediment, sediments such as earth and sand are not mixed in the water stored in the primary storage tank 1 and the secondary storage tank 2. You can

  Since the management hole 1z through which a person performing management can pass is provided on the upper surface of the primary storage tank 1, the maintenance of the primary storage tank 1 can be easily performed.

  The present invention is not limited to the embodiment described above.

  For example, the check valve 3y of the inflow / outflow control means 3 may be provided not only below the intermediate inlet 3x but also at other parts. Further, the intermediate inlet 3x may also be provided in any part as long as the part other than the remaining water discharge part 5 of the primary storage tank 1 and the secondary storage tank 2 can communicate with each other.

  Further, the positions of the inflow portion and the outflow portion of the primary storage tank may be arbitrarily set. For example, the inflow portion and the outflow portion may be set at both ends of the same side.

  Further, the shape of the primary storage tank is not limited to a rectangular shape as long as the cylindrical concrete product is arranged in an annular shape, and may be arbitrarily set to a circular shape, an elliptical shape, a square shape, a polygonal shape, or the like.

  In addition, other rainwater storage devices according to the present invention are considered as follows. In the following description, parts corresponding to the above-described embodiments are given the same names and symbols.

  The rainwater storage device SS is formed by linearly arranging box culverts 1a, which are cylindrical concrete products, as shown in a schematic plan view in FIG. 7 and an xx sectional view in FIG. A primary storage tank 1 communicating with an inflow pipe 1x for introducing rainwater into a storage space formed inside, an outflow pipe 1y for discharging rainwater from the storage space, and a standing wall vertical or substantially vertical to the primary storage tank 1 A wall 20 that forms a secondary storage space 20s between the first and second L-shaped blocks 20a and 20b, which are concrete products having 20a1 and 20b1, respectively. The secondary storage tank 2 formed by using the resin rainwater storage material 21 disposed in the secondary storage space 20s, and the secondary storage tank for rainwater exceeding the storage capacity of the primary storage tank 1 Temporarily to 2 ; And a outflow or inflow control means 3 for storing.

  Specifically, the primary storage tank 1 is formed by arranging the box culverts 1a on a straight line, and one end of the primary storage tank 1 communicates with an inflow pipe 1x that introduces rainwater into a storage space 1s formed inside, The other end is communicated with an outflow pipe 1y for discharging rainwater from the storage space 1s. And the site | part in the outflow pipe 1y vicinity, ie, the box culvert 1a connected with the outflow pipe 1y, is made into the remaining water discharge part 5, and the other site | part is set as the storage part 6, Between these remaining water discharge parts 5 and the storage part 6 The outflow amount control means 7 having the same configuration as that in the above-described embodiment is provided. That is, the outflow amount control means 7 includes an overflow wall 71 provided upright inside the box culvert 1a from the bottom plate of the box culvert 1a, and a lower portion of the overflow wall 71, preferably near the bottom surface of the storage space 1s. And an orifice 7x which is a small discharge port formed at the height position. In addition, the said box culvert 1a is the same as what was used for the rain water storage apparatus S in embodiment mentioned above.

  The wall portion 20 includes a first L-shaped block 20a as shown in FIG. 9A other than a portion and a corner portion formed by the primary storage tank 1 in the outer periphery of the secondary storage tank 20. In addition to the arrangement, a second L-shaped block 20b as shown in FIG. That is, the primary storage tank 1 and the rising wall of the wall portion 20, more specifically, the rising wall 20a1 of the first L-shaped block 20a and the rising wall 20b1 of the second L-shaped block 20b A region partitioned in the direction is formed as the secondary storage space 20s.

  The secondary storage tank 2 is formed by disposing the resin rainwater storage material 21 in the secondary storage space 20s. Although the resin rainwater storage material 21 is shown with the surface shape of the resin rainwater storage material 21 omitted in FIG. 7, it is used for the secondary storage tank 2 of the rainwater storage device S in the above-described embodiment. The structure is exactly the same as the above, and the layers are stacked in exactly the same way.

  The inflow / outflow control means 3 is located in an intermediate inlet 3x communicating with the primary storage tank 1 and the secondary storage tank 2, and is located below the intermediate inlet 3x and stored in the secondary storage tank 2. And a check valve 3y for discharging the water to the primary storage tank 1. More specifically, the intermediate inlet 3x is provided at the center of each side of the primary storage tank 1 formed by arranging the box culverts 1a in a rectangular shape, and the height of the intermediate inlet 3x is When the upper end of the overflow wall 71 is set near the upper end of the overflow wall 71 and the upper end thereof is set above the overflow wall 71, the water level in the primary storage tank 1 reaches the vicinity of the upper end of the overflow wall 71. Only water is introduced into the secondary storage tank 2. That is, the inflow / outflow control means 3 has the same configuration as that in the rainwater storage device S in the above-described embodiment. The check valve 3y of the inflow / outflow control means 3 may be provided not only under the intermediate inlet 3x but also in other parts. Further, the intermediate inlet 3x may also be provided in any part as long as the part other than the remaining water discharge part 5 of the primary storage tank 1 and the secondary storage tank 2 can communicate with each other.

  In addition, the primary storage tank 1 is provided with a sediment storage unit 1t that stores the sediment at a position below the intermediate inlet 3x. This deposit storage part 1t has the completely same structure as the thing of the rainwater storage apparatus S in embodiment mentioned above. That is, the height dimension of the box culvert 1a at the corresponding portion of the primary storage tank 1 is increased, and the bottom plate of the box culvert 1a is positioned below the bottom plate of the other box culvert 1a. The sediment is stored in a portion below the bottom plate of the box culvert 1a. In addition, you may provide the sediment storage part 1t in any site | part of the storage part 6. FIG.

  Further, in this rainwater storage device SS, as in the rainwater storage device S in the above-described embodiment, a management hole 1z through which a person performing management can pass is provided on the upper surface of the primary storage tank 1.

  When rainwater flows into the rainwater storage device SS, the rainwater is introduced into the rainwater storage device SS as follows.

  First, rainwater is guided from the front air inflow pipe 1x to the storage section 6, and further flows toward the overflow wall 71, and sediment such as earth and sand is stored in the sediment storage section 1t in the process.

  When the water level does not reach the lower end of the intermediate inlet 3x, rainwater is stored only in the storage section 6 of the primary storage tank 1. On the other hand, when the water level reaches the lower end of the intermediate inlet 3x, rainwater is introduced into the secondary storage tank 2 from the intermediate inlet 3x. Further, when the water level reaches the upper end of the overflow wall 71, water is discharged from above the overflow wall 71 through the spillway 5 to the outflow pipe 1y. On the other hand, water is discharged from the orifice 7x exactly as in the case of the rainwater storage device S in the above-described embodiment.

  On the other hand, when the amount of rainwater flowing into the rainwater storage device SS decreases, water is discharged in the same manner as in the case of the rainwater storage device S in the above-described embodiment.

  In the case of the rainwater storage device SS configured as described above, the primary storage tank 1 formed by arranging the box culvert 1a in a line and the first and second L-shaped blocks 20a and 20b, which are concrete products, are stored in the primary storage tank. Since the secondary storage tank 2 is formed by arranging the resin rainwater storage material 21 in the space 20 s defined by the wall portion 20 that is disposed adjacent to the tank 1, the interior of the secondary storage tank 2 is entered. Intrusion of rainwater from the earth and sand and the side is prevented by the primary storage tank 1 and the wall portion 20, and it is not necessary to provide a water shielding sheet on the side of the secondary storage tank 2, and the secondary storage tank 2 is generally used. Since the L-shaped blocks 20a and 20b and the lightweight resin rainwater storage material 21 are used, the secondary storage tank 2 can be set up with little effort without using a special machine. Further, since the primary storage tank 1 is formed using the box culvert 1a, the box culvert 1a for forming the primary storage tank 1 is manufactured in advance in a factory or the like, and then such a box culvert 1a is installed on the site. In addition, since the backfilling operation of the primary storage tank 1 and the construction of the secondary storage tank 2 can be performed in parallel, the construction period can be shortened.

  Further, in the rainwater storage device SS, the inflow / outflow control means 3 and the outflow amount control means 7 are configured in the same manner as the rainwater storage device S according to the above-described embodiment, and deposits are stored in the primary storage tank 1. Since the sediment storage part 1t to be provided is provided in the same manner as the rainwater storage device S according to the above-described embodiment, the effect obtained by adopting these configurations in the rainwater storage device S according to the above-described embodiment is also the same. Obtainable.

  In addition to the primary storage tank formed by arranging the concrete products in a straight line, the concrete products are arranged in an L shape, a U shape, a semi-circle, a V shape, or a ring that is partially open. Even in the formed primary storage tank, a wall portion is provided by placing a concrete product having a vertical or substantially vertical standing wall adjacent to such a primary storage tank, and the wall is provided between the primary storage tank and the wall section. If the secondary storage space is formed, that is, the primary storage tank is arranged on a part of the outer periphery of the secondary storage space, the same effect can be obtained.

1 is a schematic plan view showing a rainwater storage device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along aa in FIG. Bb sectional drawing in FIG. The perspective view which shows the resin-made rainwater storage material which forms the secondary storage tank of the rainwater storage apparatus which concerns on the embodiment. The top view, side view, and front view which show the resin-made rainwater storage material which forms the secondary storage tank of the rainwater storage apparatus which concerns on the embodiment. The figure which shows the lamination | stacking aspect of the resin-made rainwater storage materials which form the secondary storage tank of the rainwater storage apparatus which concerns on the embodiment. The schematic plan view which shows the rainwater storage apparatus which concerns on the other embodiment of this invention. Xx sectional drawing in FIG. The figure which shows the L-shaped block which forms the wall part of the rainwater storage apparatus which concerns on the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS S, SS ... Rainwater storage apparatus 1 ... Primary storage tank 2 ... Secondary storage tank 20 ... Wall part 3 ... Outflow / inflow control means 3x ... Intermediate inflow port 3y ... Check valve 4 ... Inflow part 5 ... Surplus water discharge part 6 ... Reservoir 7 ... Outflow control means 71 ... Overflow wall 7x ... Orifice

Claims (9)

An inflow pipe for introducing rainwater into a storage space formed inside by forming a cylindrical concrete product in an annular shape and an outflow for discharging rainwater from the storage space. A primary storage tank communicating with the pipe, a secondary storage tank formed by using a resin-made rainwater storage material in a space surrounded by the primary storage tank, and rainwater in excess of the storage capacity of the primary storage tank A rainwater storage device comprising an inflow / outflow control means for temporarily storing the water in the secondary storage tank. It is embedded in the ground, and is formed by arranging cylindrical concrete products in a linear shape. The inflow pipe introduces rainwater into the storage space formed inside, and the rainwater is discharged from the storage space. A primary storage tank that communicates with the outflow pipe, a wall portion that is provided with a concrete product adjacent to the primary storage tank, and that forms a secondary storage space between the primary storage tank and the secondary storage space. A secondary storage tank formed by using a distributed resin rainwater storage material, and an inflow / outflow control for temporarily storing rainwater exceeding the storage capacity of the primary storage tank in the secondary storage tank And a rainwater storage device. The inflow / outflow control means has an intermediate inlet communicating the primary storage tank and the secondary storage tank, and water stored below the intermediate inlet and stored in the secondary storage tank in the primary storage tank. The rainwater storage device according to claim 1, further comprising a check valve for discharging. The primary storage tank includes an inflow portion that faces the inflow pipe, a spillway portion that faces the outflow pipe, a storage portion that is positioned between the inflow portion and the spillway, the storage portion, and the surplus portion. The storm water storage device according to claim 1, 2 or 3, further comprising an outflow amount control means disposed between the water discharge portion. The said outflow amount control means comprises the overflow wall provided upright inside the cylindrical concrete product, and a small discharge port formed in the lower part of this overflow wall. Rainwater storage device. 6. The rainwater storage device according to claim 5, wherein a height position of a lower end of the intermediate inlet of the inflow / outflow control means is set in the vicinity of a height position of the upper end of the overflow wall. The floating substance removal wall which prevents the inflow of the floating substance into the said storage part is provided between the said inflow part of the said primary storage tank, and the said storage part, The Claim 3, 4, 5 or 6 characterized by the above-mentioned. The rainwater storage device described. The rainwater storage apparatus according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the primary storage tank is provided with a sediment storage section for storing the sediment. The rainwater storage device according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein a management hole through which a person performing management can pass is provided on an upper surface of the primary storage tank.

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