JPH1136423A - Flood control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flood control device such that an inflow vessel and a reservoir can be manufactured into simple constitution at low cost without taking excess space for installation. SOLUTION: In a part of a channel 2 such as a U-groove, a diverging control part which, if flow from the upstream side has risen in excess of anticipated flow rate, causes the excess flow to diverge into other channel, is provided. A reservoir 5 which receives and retains the diverged flow until a certain amount of water is retained and which is equipped with a mechanism controlling the release of the retained water toward the downstream side is provided downstream of the diverged flow. The diverging control part serves as an inflow vessel 3 which temporarily receives the water flowing in from the upstream channel 2a of the channel 2 and then causes it to diverge into a downstream water channel 2b and other channel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flood control device which includes an inflow tank and a storage tank in the middle of a flowing water channel to control flowing water during a flood.

[0002]

2. Description of the Related Art Conventionally, an inflow tank for temporarily storing water up to a predetermined amount in a flowing water channel and discharging the same, and when the amount of water stored in the inflow tank reaches a predetermined amount, the overflow water flows in. It is necessary to install a flood control device equipped with a storage tank that stores at least a predetermined amount of water and releases the water in a controlled manner, and adjusts the flow rate to downstream rivers when floods increase.
It is already known as shown in -6581-2.

[0003]

The flood control device disclosed in the above publication has a configuration in which an inflow tank and a storage tank are installed in the middle of a flowing water channel in a parallel state, and thus occupies a large installation area of the flood control device. In addition to the drawbacks, there is a problem that the size of the apparatus when installing it in a housing complex or the like becomes large and the construction is complicated, so that the cost increases.

[0004]

In order to solve the above-mentioned problems, a flood control apparatus according to the present invention divides an increase in the amount of flowing water itself from the upstream in a water channel into another flow channel and discharges the increased flow. First, when the flow rate from the upstream side exceeds the expected flow rate in the middle of the flow channel 2, a branch flow adjusting unit is provided for branching the increased flow rate to another flow path. And a storage tank 5 provided with a mechanism for receiving the diverted water and storing the same until a certain amount of water is stored, and for suppressing and controlling the discharge of the stored water to the downstream side.

[0005] Secondly, the inflow tank 3 is characterized in that the diversion adjusting section temporarily receives the inflow water from the upstream water passage 2a of the flowing water passage 2 and then branches the downstream water passage 2b into another flow passage. And

Thirdly, a first flowing water portion inflow tank 3 for discharging the water in the inflow chamber 3 on the downstream side water passage 2b side when the water level in the inflow chamber 3 exceeds a predetermined low water level h _3, predetermined And a drain portion 64 for diverting water to the storage tank 5 when the water level exceeds the high water level.

Fourth, the inflow tank 3 is provided in a mezzanine-floor shape so as to form a water storage space 35 above and below the storage tank 5.

Fifth, the flowing water channel 2 is bent or curved in a plan view between the upstream water channel 2a and the downstream water channel 2b to form an overflow adjusting section 2d, and the flow rate of the flowing water channel 2 exceeds a predetermined flow rate. In this state, the overflowing flow is adjusted so that the overflowing flow is adjusted by the overflow control section 2d to flow into the flow path on the storage tank 5 side.

Sixth, the flow path 2 is characterized in that the flow path 2 penetrates in the flow direction of the inflow tank 3 in plan view or is installed along the side wall of the inflow tank 3.

Seventh, the storage tank 5 is provided with a second flowing water section 62 for discharging and discharging water downstream at a discharge pressure according to the water level of the stored water in the storage tank 5 and at a discharge amount according to the water level. It is characterized by.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to a model explanatory drawing. 1 to 3, reference numeral 1 denotes a flood control device (reservoir) installed in the middle of a flowing water channel 2 constructed in an apartment complex or the like. It is installed at an appropriate number for each predetermined distance in accordance with the amount of water increase, and by this, it is possible to adjust the amount of water flowing through the waterway 2 and buffer the water flow at the time of flooding, and to maintain the downstream riverbed satisfactorily. It functions as a natural disaster prevention control pond.

The flood control device 1 is provided between an upstream water passage 2a and a downstream water passage 2b of a water passage 2 for flowing water from an upstream to a downstream, and communicates with the upstream water passage 2a to temporarily discharge the effluent. And a relatively small-capacity inflow tank 3 serving as a diversion control unit that divides the water into another flow path, and when the amount of water in the inflow tank 3 becomes equal to or higher than a predetermined water level, the outflow water from the inflow tank 3 And a large-capacity storage tank 5 for receiving and storing.

Then, as shown in FIG.
Along the right side wall 50 and the lower side wall 52 of the storage tank 5 formed in a rectangular shape by a concrete method or the like, the side water passage 2c and the downstream water passage 2b downstream of the upstream water passage 2a are formed. The side water channel 2c is formed in a U-shaped cross section by the side wall 50 and the water channel side wall 20 having substantially the same height as the side water channel 2c. I make it flow down. In the downstream part of the water channel 2 where the water flow is steep, a water flow attenuating means 21 including a conventional step surface, uneven surface, weir wall, and the like is provided.

On the other hand, the inflow tank 3 is formed in a shelf-shaped mezzanine floor separated from the bottom of the storage tank 5 upward, and the height of the bottom wall 30 is made equal to the bottom of the lateral flow channel 2c. The storage tank 5 has substantially the same height, and the right side wall 50 and the upper side wall 51 of the storage tank 5 serve as two side walls facing the side wall 31 located in the storage tank 5. The height of the side wall 31 is formed at a water level H1 lower than a water level H formed by a third water flowing portion 63 described later formed on the upper side of the right side wall 50. Therefore, the flood control device 1 having the above configuration
A water storage space 35 for storing flowing water is formed below the inflow tank 3 to increase the capacity of the storage tank 5.

In the inflow tank 3, a water hole 55 is opened in the right side wall 50 at a water level H2 where the water level is lower than the water level H1, and an inverted U-shaped water pipe (siphon pipe) is provided in the water hole 55. 32 with the central portion thereof attached and fixed, the water level H3 is set at a position lower than the water hole 55 and slightly higher than the inner surface of the bottom portion 30 by the end of the water pipe 32 inside the inflow tank 3. Is formed, and the first flowing water portion 61 is formed by extending the end of the water pipe 32 on the side facing the side water passage 2c so as to be lower than the water level H3. 33 is a screen attached to the suction end of the water pipe 32.

Thus, when the amount of water flowing into the inflow tank 3 from the upstream water channel 2a exceeds the water level H2, the first flowing water portion 61 starts discharging the stored water to the flowing water channel 2 by the siphon action until the water level reaches H3. Let out. Therefore, the inflow tank 3
The inside is maintained at a vacant water volume that is balanced with the water volume discharged from the first flowing water portion 61 at the time of normal running water, and the increased water content at the time of the flood is buffered by utilizing the vacant capacity of the inflow tank 3. Can be. When the water level exceeds the water level H1, the inflowing water flows through an overflow portion (drainage portion) 64 formed at the height of the side wall 31 and is stored in the storage tank 5. The overflow section 64 may be configured such that a drain section (not shown) including a drain port is provided on the peripheral wall 31 of the inflow tank 3. Note that the first flowing water portion 61 is not limited to the siphon type shown in the drawing, and may be directly discharged to the flowing water channel 2 from a water passage hole (not shown) opened in a lower portion of the inflow tank 3. Good thing.

In the vicinity of the bottom of the storage tank 5, a second flowing water section 62 is opened at a position close to the bottom of the lower side wall 52,
The flowing water that has overflowed from the overflow section 64 is stored in the storage tank 5, and the stored water is caused to flow out to the downstream water passage 2b while increasing or decreasing the discharge amount in accordance with the water pressure based on the amount of water flowing in and stored. . Above the side wall 50 of the storage tank 5 on the side of the side water channel 2c, a water level is set such that a range longer than the length of the inflow tank 3 is higher than the water level H1 and lower than the maximum water level of the peripheral walls 50 to 52 of the storage tank 5. H is cut out to form a third flowing water portion 63, and when the storage tank 5 becomes full due to increased water at the time of flooding or the like, the third flowing water portion 63 is also shifted from the position near the upstream waterway 2a to the side waterway 2c. It is designed to control the discharge during floods by allowing the water to overflow.
In addition, the flowing water channel 2 is configured such that the flow capacity of the side water channel 2c and the downstream water channel 2b is such that the amount of water equal to or greater than the maximum discharge amount that merges from each flowing water channel flows smoothly.

The flood control device 1 configured as above is
While the running water in the normal state is temporarily stored in the inflow tank 3 from the upstream water passage 2a until the water level reaches H2, the stored water flows from the first flowing water portion 61 to the lateral water passage 2c from the first water flowing portion 61 through the water flowing pipe 32 through the water flowing hole 55. Let out. In addition, the 2nd water which increased more than usual
In the stage, the stored water in the inflow tank 3 is caused to flow more than the water discharged from the first flowing water part 61 into the storage tank 5 from the overflow part 64 and stored in the storage tank 5, and the stored water is Is discharged from the second flowing water portion 62 to the lower waterway 2b by a flow amount restricted by the discharge hole diameter of the flowing water portion 62, etc., so that the downstream side of the storage tank 5 does not rapidly increase when the water is increased. .

When a sudden and large amount of water flows into the storage tank 5 during a flood or the like, the storage tank 5 flows through the above-described embodiment.
The water flowing beyond the water discharged by the second flowing water portion 62 is sequentially stored therein, and the amount of water discharged from the second flowing water portion 62 increases at the water head pressure as the amount of water in the storage tank 5 increases. ,
The storage capacity in the storage tank 5 can be maintained satisfactorily to accommodate the increased water content. Further, when the stored water exceeds the water level H due to further water increase, the stored water is caused to flow out of the third flowing water portion 63 to the overflow side channel 2c so that the water increase at the time of the flood can be accurately adjusted.

The flood channel 2 in which a plurality of flood control devices 1 are installed as described above buffers the rapid rising flow while adjusting and storing the rising water generated in the middle of the flowing channel 2 at an appropriate place, and discharges the water from the discharge pond or the river. Therefore, there is an advantage that adverse effects and accidents caused by the flood can be prevented. The inflow tank 3 is formed in the storage tank 5 as shown in the illustrated example, and the flood control device 1 configured as a mezzanine can be centralized without occupying an excessively large installation area. In addition, water can be stored also in a space formed below the inflow tank 3, so that the water storage capacity can be increased as much as possible.

Further, since it is easy to form the flowing water channel 2 along the peripheral wall of the storage tank 5, the water discharging (outflow) structure of the first flowing water portion 61, the second flowing water portion 62, and the third flowing water portion 63 is formed. It can be manufactured easily and inexpensively, and
There is an advantage that individual water discharge can be appropriately performed while simplifying a water discharge (outflow) structure in which the water flowing part 62 is provided separately from the first water flowing part 61 and the third water flowing part 63. Therefore, the flood control device 1 can be easily constructed without occupying an excessively large installation space, and can be more effectively installed by installing it in a widely developed area such as a housing complex as a rain water flow system. There is an advantage that it can be made to act effectively. In other words, in this case, the inflow of large stones and debris is satisfactorily prevented by grating or the like installed in normal rainfall, and the allowable discharge flow rate is 7 to
Water is discharged freely up to 80% of the amount of water, and the flood control device 1 can accurately prevent the adverse effects caused by a sudden increase in water level at the downstream during flooding. 33
Is a strainer provided on the inflow side of the siphon pipe 32 of the first flowing water section 61.

4 and 5 are a plan view and a sectional view of a regulating pond showing another embodiment of the present invention. In this example, an inflow tank 3 for receiving flowing water from the flowing water channel 2 is provided in the middle of the flowing water channel 2.
Storage tank 5 for receiving and storing overflow water from the inflow tank 3
Is provided below the inflow tank 3 and near the bottom of the peripheral wall of the storage tank 5, a second flowing water portion 62 that is drained downstream at a discharge rate corresponding to the water level of the storage tank 5 is provided. This is common to the previous two examples in that the configuration is such that water flows into the downstream water channel 2b when the water level rises.

In the following, the characteristic portion of the example shown in FIGS. 4 and 5 will be mainly described. In this example, the flowing water channel 2 composed of a continuous U-shaped groove is formed in the inflow tank 3 covered with the grating 36 from the upstream to the downstream. penetrates through in the direction, we put in the inlet tank 3 shape (or even an arcuate possible) forms a overflow adjustment unit 2d bent in, exceeds the water level h ₁ increasingly water flow of flowing water channel 2 Then, water overflows from the overflow portion 2 d by an excess amount of water and flows out into the inflow tank 3.

The overflow without water level adjustment unit 2d is when h ₁ below flowing into the inlet tank 3, overflow adjuster 2 of flowing water channel 2
d flows into the first flowing water portion 61 and is drained to the downstream water passage 2b side. When the water level in the inflow tank 3 reaches a drainage portion 64 formed by a drainage port provided in the peripheral wall 31, the water flows out into the storage tank 5 and is stored. The bending of the overflow adjusting portion 2d facilitates the flow of water into the inflow tank 3 by the bent portion more reliably at the bent portion when the amount of water in the water channel 2 increases.

The storage tank 5 has upper and lower bottoms 57a and 57b as shown in the drawing, and the upper bottom 57a is a water-permeable structure having a structure that allows a certain amount of inflow water to penetrate underground. it can. Similarly, the storage tank side wall 50 on the inflow tank 3 side may be a side wall that can penetrate underground. In addition to the side walls 50 to 53, an overflow wall 54 having a lower height than the side walls 50 to 53 is erected at the corner of the downstream side wall 53 at the lower side bottom portion 57b of the storage tank 5 in an L-shape in plan view. A drainage space 56 having a cylindrical shape is formed. 59 is storage tank 5
Is a screen for collecting suspended solid effluent and the like formed so as to surround the upstream side of the overflow wall 54 on the downstream side of.

In the lower part of the overflow wall 54, a hole for draining the water flowing into the storage tank 5 to the drain space 56 side is formed as a second drain part (orifice) 62, and the water level is defined by the drain part 62. Above the water level h ₄ beyond, and has a structure in which the waste water from the second water discharge portion 62 at a discharge pressure corresponding to the height of the water level of the storage tank 5. When the water level of the water stored in the storage tank 5 exceeds the water level h reaching the upper end of the overflow wall 54, the stored water overflows the third flowing water portion 63 formed by the upper end of the overflow wall 54 and drains water. The water is overflowed into 56.

At the bottom of the lower side wall 53 of the storage tank 5, there is provided a drainage portion 58 composed of a drainage hole for discharging water in the drainage space 56 to the drainage passage 2e downstream.

When the amount of water in the water channel 2 increases due to an increase in the amount of rainfall and the like with the above configuration, in addition to the water flowing downstream by the water channel 2 itself, the increased water is supplied to the storage tank 5 through the drainage portion 64 of the inflow tank 3. In accordance with a change in the water level (change in the amount of stored water), and is discharged downstream from the flowing water portion 58 through the second flowing water portion 62 or further through the third flowing water portion 63. Until the water level in the storage tank 5 reaches the maximum water level h, the amount is reduced. In the description of each of the above embodiments, the same reference numerals are used for the portions having the same technical configuration and function as those described above, and the description of the following portions is omitted.

[0029]

According to the apparatus of the present invention configured as described above, when the drainage channel increases due to an increase in the amount of rainfall mainly in an apartment complex or other development area, only the increased water is divided. It is a type that stores and discharges it while adjusting it, so there is no need for a large-capacity inflow tank or storage tank as compared with one that discharges while storing all the water in the drainage channel, and there is an advantage that the entire device can be downsized. . Therefore, it can be installed using a relatively small space near a drainage channel such as a U-shaped ditch in an urban area, etc., and the possibility of installation in a large number of places is increased. Can be. In addition, while the storage tank can be reduced in size, the space below the inflow tank can be effectively used as a water storage space by providing a small mezzanine-shaped inflow tank above the inside.

Further, by providing the overflow control section in the flow channel itself, it is not always necessary to provide an inflow tank for receiving the increased overflow water in the flow channel. Since the storage tank is provided with the second flowing water section for discharging a small amount, the stored water is discharged downstream little by little and stored only when there is a large amount of inflow water from the branch flow adjustment section. As the total amount of water stored in the storage tank increases, the water is drained from the second flowing section at a discharge pressure in accordance with the rise in the water level in the storage tank. There is an advantage that the storage space of the storage tank can be used more effectively. In addition, since there is no manual adjusting unit or setting unit provided in the storage tank or the branch flow adjusting unit, there is an advantage that there is less human operation error.

In addition to the above, since the storage tank is flooded only during heavy rainfall, for example, about 1 to 3 times a year, depending on the design method, it is incorporated as part of a park or outdoor activity facility, etc. It can be used as a natural regulating pond. In addition, since the storage tank can be installed close to a normal drain gutter, there is almost no inflow of earth and sand, frequent dredging is unnecessary, and no maintenance cost is required.

[Brief description of the drawings]

FIG. 1 is a perspective view of a flood control device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing FIG. 1 from the left.

FIG. 3 is a sectional view showing a main part of FIG. 1;

FIG. 4 is a perspective view of a flood control device according to a second embodiment of the present invention.

FIG. 5 is a sectional view showing a main part of the apparatus shown in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flood control device 2 Flow waterway 2a Upstream waterway 2b Downstream waterway 2c Sideway waterway 2d Overflow control part (diversion control part) 3 Inflow tank (diversion control part) 5 Storage tank 32 Water flow pipe (siphon pipe) 35 Water storage space Reference Signs List 50 Side wall 55 Water hole 61 First flowing part 62 Second flowing part 63 Third flowing part 64 Drainage part

Claims (7)

[Claims] When a flow rate from an upstream side exceeds a predetermined flow rate in the middle of a flowing water channel (2), a branch flow adjusting section is provided for branching the flow rate of the increased water flow to another flow path. Flood control provided with a storage tank (5) provided with a mechanism for receiving the diverted water downstream of the diverted water and storing the diverted water until the amount of the diverted water reaches a certain amount, and for controlling and controlling the discharge of the diverted water downstream. apparatus. 2. An inflow tank (3) in which a diversion controller temporarily receives inflow water from an upstream waterway (2a) of a flowing waterway (2), and then branches the downstream waterway (2b) into another flowpath. The flood control device of claim 1, wherein Wherein the inlet tank (3) is discharged to the inlet tank (3) downstream water passage (2b) side of water inlet tank (3) in when the water level exceeds the predetermined low water level h ₃ in 3. The flood control device according to claim 2, further comprising: one flowing water portion; and a drainage portion (64) for diverting water to a storage tank (5) when a predetermined high water level is exceeded. 4. The flood control as claimed in claim 2, wherein the inflow tank (3) is provided in a mezzanine level above the storage tank (5) so as to form a water storage space (35) therebelow. apparatus. 5. The overflow channel (2d) is bent or curved in a plan view between the upstream channel (2a) and the downstream channel (2b) to form an overflow adjusting section (2d). ) In the state where the flow rate exceeds the predetermined flow rate and the overflow control section (2)
The flood control device according to claim 1, wherein in d), the flowing water corresponding to the increased flow rate is divided into the flow path on the storage tank (5) side. 6. The flood control device as claimed in claim 1, wherein the flow channel (2) is formed so as to penetrate the inflow tank (3) in the flowing direction in plan view or along the side wall of the inflow tank (3). 7. A second flushing section (62) for discharging water to the downstream of the storage tank (5) with a discharge pressure according to the level of the stored water in the storage tank (5) and a discharge amount according to the water level. The flood control device according to claim 1, 2 or 3 or 4 or 5 or 6, comprising: