JP5704566B2 - Rainwater storage device - Google Patents

Description

  The present invention relates to a rainwater storage device that temporarily stores water overflowing on the ground during heavy rain and prevents water from entering houses and roads.

  Rainwater storage facilities include a long storage pipe that has been embedded in the ground with a slope that is nearly horizontal and can be discharged into a river (Non-Patent Document 1), or a pond provided in the suburbs. Are known. Of these, long storage pipes have to dig up the same plane area during burial work, which is extremely costly and involves the risk of cutting gas pipes, water supply pipes, transmission lines, and the like. In addition, the regulating pond requires a fairly large idle land and has its limitations.

  In recent years, therefore, a storage device has been proposed in which a large number of tanks are buried in the ground in the horizontal direction and the tanks are connected to each other (Patent Document 1). The tank is made of concrete and is placed by a vertical shield method, and then a horizontal hole is excavated and adjacent tanks are connected by a connecting pipe.

JP2008-127870

Kawasaki City Waterworks and Sewerage Bureau> Page of Sewerage Business> Basic Knowledge of Sewerage> Maintenance of Rainwater Storage Pipe, [online], [Search May 17, 2011], Internet <http://www.city.kawasaki.jp /53/53kense/home/usui_choryuukan/usui_choryuukan.htm>

However, it is dangerous to carry a large number of concrete tanks and the transportation costs are considerable.
Therefore, a first object of the present invention is to provide a rainwater storage device that can be constructed at a low cost, and it is sufficient to dig up a small plane area. A second problem is to provide an apparatus that can be applied as a water storage facility for fire prevention water and the like.

In order to solve the first problem, the rainwater storage device of the present invention comprises:
In what comprises a plurality of tanks buried side by side horizontally in the ground, and a pipe connecting the tanks,
Each of the tanks is composed of a plastic bottomed inner cylinder standing in a vertical direction and an outer cylinder formed on the outer periphery of each inner cylinder and containing cement as a main component.

  According to the apparatus of the present invention, since the tanks are erected in the vertical direction and close to each other, it is only necessary to dig up a ground with a remarkably small plane area compared to a storage pipe that is horizontally embedded with the same volume. It ’s enough. Moreover, since the inner cylinder is light and the outer cylinder is molded in the field, all are easy to carry and safe, and the carrying cost is low.

In order to solve the second problem, the rainwater storage device of the present invention is:
Among the plurality of tanks, a part is for long-term storage and the remaining part is for short-term storage, and at least a first tank for long-term storage and at least a first tank for short-term storage each have an inlet / outlet connected to the outside at the top. Have
At least one tank for long-term storage and at least one tank for short-term storage communicate with each other at an upper portion lower than the inlet / outlet;
The remaining tanks for long-term storage and the remaining tanks for short-term storage communicate with each other in the lower part.

  According to this configuration, the inlet / outlet of the first tank for short-term storage is closed at all times, and only the inlet / outlet of the first tank for long-term storage is opened to the ground surface, gutters, or existing rainwater pipes. . Then, during heavy rain, rainwater first flows into the first tank for long-term storage. And, the tank group for long-term storage and the tank group for short-term storage are such that at least one tank selected from each communicates at the top, whereas tanks for long-term storage are Since it communicates at the bottom, the tanks for long-term storage are filled with rainwater. Thereafter, rainwater flows into the tank group for short-term storage through the upper connecting pipe.

  On the appropriate day when the rain has stopped and the water level in the river has fallen, the rainwater collected from the first tank for short-term storage is pumped and discharged. The tank group for long-term storage and the tank group for short-term storage are such that at least one tank selected from each other is in communication with the upper part. As long as it is pumped, rainwater will remain in the tanks for long-term storage even if it is pumped.

  Therefore, in the event of a fire or a very hot day, fire prevention or summer protection can be performed by discharging or sprinkling water from a tank group for long-term storage. The bottom of the first tank for short-term storage is preferably deeper than the other tanks. This is because all the rainwater in the tank group for short-term storage can be discharged through this tank.

  Since the rainwater storage device of the present invention only needs to dig up a small plane area for installation, it can be constructed at low cost, and can also greatly reduce the risk of cutting gas pipes, water pipes, power transmission lines, etc. . It is also useful as a water storage facility for fire prevention water.

It is horizontal direction sectional drawing which shows the rainwater storage apparatus which concerns on embodiment. (A) is AA 'sectional drawing in FIG. 1, (b) is BB' sectional drawing similarly. It is vertical direction sectional drawing which shows the construction method of the rainwater storage apparatus which concerns on embodiment to process order.

  A rainwater storage device according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the rainwater storage device 1 includes 32 tanks T embedded in the ground in 8 rows × 4 columns in the horizontal direction, and a pipe P that connects the tanks T to each other. ing. Hereinafter, the symbols T and P are used when referring to tanks and tubes, respectively, and Tmn (m is a row number, n is a column number) and Ps (s is a positive integer) when referring to individual tanks and tubes. ). The dimensions, number, material, etc. are all examples and are not limited to these. The tanks T may be arranged in a hexagonal close-packed structure instead of vertically and horizontally.

  Each tank T has a bottomed inner cylinder 2 made of fiber-reinforced PET having a circular outer cross section with an outer diameter of 2 m and a depth of about 7 m, and a thickness of about 25 cm on the outer periphery of each inner cylinder 2. The outer cylinder 3 made of mortar. Of the 32 tanks T, 4 tanks T11 to T14 located in one row are for long-term storage for fire prevention and heat protection, and the other 28 tanks T21 to T84 are short-term for heavy rain. Used for storage.

  One tank T11 of the tank group for long-term storage and one tank T21 for short-term storage located adjacent to the tank group have an inlet / outlet 4 connected to the ground surface and openable / closable with a lid on the upper end surface. The vertical length of the inlet / outlet 4 is normally set so that the upper end surface of the tank T is deeper than piping / wiring such as a gas pipe, a water supply pipe, and a power transmission line, and is about 1 m, for example. The inlet / outlet 4 of the tank T11 may be connected to a side groove (not shown) or an existing rainwater pipe. The upper end surfaces of the other tanks are all closed.

  The tank T11 and the tank T21 communicate with each other via a pipe P1 at an upper portion slightly lower than the inlet / outlet 4. In addition, the tank T12 and the tank T22 communicate with each other via the pipe P2 at an upper portion lower than the pipe P1. The tanks T21 to T81 communicate with each other through the pipes P3, P3,. Furthermore, the tanks T for long-term storage communicate with each other by a pipe P4 in the lower part where the neighbors are close to the bottom, and the tanks T for short-term storage are adjacent to each other from the tank Tm1 to the tank Tm4. The pipe P5 communicates with each other in the lower part close to. The pipes P1 to P5 are all made of vinyl chloride with an outer diameter of 0.8 m. The bottom of the tank T21 is 0.5 m deeper than other tanks.

  A method of embedding each tank T will be described with reference to FIG. First, as shown in FIG. 3A, a steel casing 5 having an outer diameter equivalent to the outer diameter of the tank T is press-fitted into the ground while being rocked, and the steel casing 5 is excavated. If necessary, the subsequent casing is added and press-fitting / excavation is continued. After lowering to the prescribed depth, foundation concrete 6 is placed as shown in FIG. 3 (b), and the inner cylinder 2 is omitted from the drawing. Fix with bolts. As shown in FIG. 3C, the casing 5 is pulled out while filling the mortar 7 between the inner cylinder 2 and the casing 5 in a state where water W is injected into the inner cylinder 2. When the mortar is hardened, the outer cylinder 3 is formed. As shown in FIG. After draining, the pipe Ps is inserted and fixed by making a hole in the side surface of the tank T before closing the upper end surface.

According to this apparatus 1, since the tanks T are set up in the vertical direction and are arranged adjacent to each other in the horizontal direction, they are embedded in the horizontal direction. Just digging up is enough. That is, if a storage pipe of the same shape and size as the tank T is buried horizontally, a ground area of ² m × 7 m = 14 m ² must be excavated per piece. In the case of this apparatus 1, 1 m per piece It is only necessary to dig an area of × 1m × 3.14 = 3.14m ² . Moreover, since the inner cylinder 2 is light and the outer cylinder 3 is shape | molded on-site, all are easy to convey. Therefore, civil engineering costs are low.

  When the apparatus 1 is used, the inlet / outlet of the tank T21 for short-term storage is normally closed and only the inlet / outlet of the tank T11 for long-term storage is opened. Then, during heavy rain, first, rainwater flows into the tank T11. The tank groups T11 to T14 for long-term storage and the tank groups T21 to T84 for short-term storage are such that the tanks T11 and T21 and the tanks T12 and T22 communicate with each other only at the top. Since the long-term storage tanks T11 to T14 communicate with each other in the lower part, the long-term storage tank groups T11 to T14 are first filled with rainwater. Thereafter, rainwater flows into the tank T22 via the upper pipe P2. Since the tank T22 and the other short-term storage tank groups T21 to T84 communicate with each other at the lower part, the tank groups T21 to T84 are filled while maintaining the same water level.

  On an appropriate day when the rain has stopped and the water level in the river has dropped, the lid of the tank T21 is opened, and the rainwater collected from the inlet / outlet 4 is pumped out by a pump not shown. The pump may be permanently installed at the bottom of the tank T21 and connected to an external power source via the inlet / outlet 4, or may be carried during use. Since the bottom of the tank T21 is deeper than the bottoms of the other tanks for short-term storage, all rainwater in the tank groups T21 to T84 for short-term storage returns to the tank T21 and is discharged from the inlet / outlet 4 when discharged. .

  On the other hand, since the tank groups T11 to T14 for long-term storage and the tank groups T21 to T84 for short-term storage are merely in communication between the tank T11 and the tank T21 and between the tank T12 and the tank T22, As long as the water is drawn from the inlet / outlet 4 of the tank T21, rainwater up to the height of the pipe P2 remains in the tank groups T11 to T14 for long-term storage even if all the water is pumped. Therefore, in the event of a fire or on a very hot day, fire prevention or summer protection can be performed by discharging or spraying water from the inlet / outlet 4 of the tank T11.

DESCRIPTION OF SYMBOLS 1 Rain water storage device 2 Inner cylinder 3 Outer cylinder T Tank 4 Entrance / exit P pipe

Claims (2)

In what comprises a plurality of tanks buried side by side horizontally in the ground, and a pipe connecting the tanks,
Wherein the plastic bottomed cylinder each tank is erected vertically, are formed on the outer periphery of each inner cylinder, Ri Do from an outer cylinder composed mainly of cement,
Among the plurality of tanks, a part is for long-term storage and the remaining part is for short-term storage, and at least a first tank for long-term storage and at least a first tank for short-term storage each have an inlet / outlet connected to the outside at the top. Have
At least one tank for long-term storage and at least one tank for short-term storage communicate with each other at an upper portion lower than the inlet / outlet;
The rainwater storage device characterized in that the remaining tanks for long-term storage and the remaining tanks for short-term storage communicate with each other in the lower part . The apparatus of claim 1 , wherein the bottom of the first tank for short-term storage is deeper than the other tanks.

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