JP3550000B2 - Flood control device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a flood control device that includes an inflow tank and a storage tank in the middle of a flow channel to adjust the flow of water during a flood.
[0002]
[Prior art]
Conventionally, an inflow tank that temporarily discharges a predetermined amount of water in the middle of a flowing water channel and discharges the water, and when the amount of water stored in the inflow tank reaches a predetermined amount, the overflow water flows into the inflow tank to further reduce a predetermined amount of water. It is disclosed in Japanese Utility Model Publication No. 57-6581-2 that a flood control device equipped with a storage tank for storing a quantity of water and sequentially controlling and discharging the water is installed to adjust the flow rate to a downstream river when the flood or the like increases. As already known.
[0003]
[Problems to be solved by the invention]
The flood control device disclosed in the above publication has a drawback that it occupies a large installation area of the flood control device because the inflow tank and the storage tank are installed in the middle of the flowing water channel in a state of being parallel to each other. When installing, there are problems such as an increase in the size of the apparatus and an increase in cost due to complicated construction.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a flood control device of 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 suppresses and discharges it. In the middle of the flow, when the flow rate from the upstream side is increased beyond the expected flow rate, a diverting control unit that branches the increased flow rate to another flow path is provided, and the diverted water is provided on the downstream side of the branched diverted water. A storage tank 5 provided with a mechanism for receiving and storing the stored water until it reaches a certain water storage amount, and having a mechanism for suppressing and adjusting the discharge of the stored water to the downstream side, and providing the flowing water channel 2 with an upstream water channel 2a and a downstream water channel 2b; Is bent or curved in a plan view to form an overflow adjusting section 2d, and in the overflow adjusting section 2d, the flowing water corresponding to the increased flow rate is stored in the storage tank 5 in a state where the flow rate of the flowing water channel 2 exceeds a predetermined flow rate. characterized in that a configuration that allowed to shunt the flow path side There.
[0005]
Second, it is characterized in that it has established a flowing water channel 2 and along the inlet tank 3 in a plan view on the side wall of the flowing water direction was penetrated or inflow tank 3.
[0006]
Is characterized by comprising a second flowing water 62 for discharging waste water to the downstream side in the discharge amount in accordance with and the water level in the discharge pressure corresponding to the water level of the stored water in the storage tank 5 to the storage tank 5 is provided in the third I have.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described based on a model explanatory drawing. 1 to 3, reference numeral 1 denotes a flood control device (reservoir) installed in the middle of a running water channel 2 constructed in an apartment complex or the like. It is installed at an appropriate number at a predetermined distance according to 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 during floods, and to maintain the downstream riverbed satisfactorily. It functions as a natural disaster prevention control pond.
[0008]
The flood control device 1 is connected between the upstream water channel 2a and the downstream water channel 2b of the water channel 2 for flowing water from the upstream to the downstream to communicate with the upstream water channel 2a to temporarily receive the effluent. A relatively small-capacity inflow tank 3 serving as a diversion controller for diverting the flow into another flow path; and receiving and storing the effluent from the inflow tank 3 when the amount of water in the inflow tank 3 exceeds a predetermined water level. And a large-capacity storage tank 5.
[0009]
Then, as shown in FIG. 3, the flood control device 1 is located downstream of the upstream waterway 2 a along the right side wall 50 and the lower side wall 52 of the storage tank 5 formed in a square shape by a concrete method or the like. The side waterway 2c and the downstream waterway 2b are provided with a downward slope, and the side waterway 2c is formed in a U-shaped cross section by the side wall 50 and the waterway side wall 20 having substantially the same height, as will be described later. The maximum water flow is made to flow smoothly without overflowing.
In the downstream part of the flowing 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.
[0010]
On the other hand, the inflow tank 3 is formed in a shelf-like mezzanine-floor shape which is separated upward from the bottom of the storage tank 5, and the height of the bottom wall 30 is substantially the same as the bottom of the lateral flow channel 2c. In addition, the right and left side walls 50 and 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 set to 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, in the flood control device 1 having the above configuration, the water storage space 35 for storing the flowing water is formed below the inflow tank 3, and the capacity of the storage tank 5 is increased.
[0011]
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) 32 is inserted into the water hole 55. Then, with the central portion attached and fixed, a water level H3 is formed 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. At the same time, the first flowing water portion 61 is formed by extending the end of the water passage 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.
[0012]
Accordingly, when the amount of water flowing into the inflow tank 3 from the upstream water passage 2a exceeds the water level H2, the first flowing water portion 61 starts discharging the stored water to the flowing water passage 2 by the siphon action and flows out until reaching the water level H3.
Therefore, the inside of the inflow tank 3 is maintained at a vacant water amount which is balanced with the amount of water discharged from the first flowing water portion 61 at the time of normal flowing water. Can be buffered. When the water level exceeds the water level H1, the inflowing water flows through an overflow section (drainage section) 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.
In addition, 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 flowing hole (not shown) opened in a lower portion of the inflow tank 3. Good thing.
[0013]
In addition, near 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, and the flowing water flowing 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 according to the water pressure based on the stored water amount. 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 highest water level of the peripheral walls 50 to 52 of the storage tank 5. H is cut off 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 side flowing water channel 2c also extends from the third flowing water portion 63 to a position close to the upstream water channel 2a. It is designed to control discharges during floods by allowing them to overflow into the country.
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 that is equal to or greater than the maximum discharge amount that merges from each flowing water channel flows down smoothly.
[0014]
The flood control device 1 configured as described above stores the flowing water in the normal state from the upstream water channel 2a in the inflow tank 3 until the water level reaches the water level H2. The water is discharged from the first flowing water portion 61 to the side water channel 2c.
In the second stage, which is higher than usual, the stored water in the inflow tank 3 is caused to flow from the overflow section 64 into the storage tank 5 by flowing more water than is discharged from the first flowing water section 61. 5 and discharges and discharges the stored water from the second flowing water portion 62 into the lower waterway 2b by a flow amount restricted by the discharge hole diameter of the flowing water portion 62, etc. There is no sudden rise of water on the side.
[0015]
In the case where the rising water flows rapidly and in large quantities at the time of flooding or the like, the water flowing beyond the second water flowing portion 62 is sequentially stored in the storage tank 5 while passing through the above-described mode, and the second As the amount of water in the storage tank 5 increases, the amount of water discharged also increases with the head pressure of the flowing water part 62, so that the storage capacity in the storage tank 5 can be maintained well and the increased water content can be stored.
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 portion 63 to the overflow side waterway 2c, so that the water increase at the time of the flood can be accurately adjusted.
[0016]
The waterway 2 in which a plurality of the flood control devices 1 are installed as described above buffers the sudden rising water flow and adjusts and stores the rising water generated in the middle of the flowing waterway 2 at an appropriate place to reach the discharge basin 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 in the illustrated example, and the flood control device 1 configured in a mezzanine floor can be integrated without excessively occupying the installation area, so that it is simple and low cost. In addition, water can be stored in a space formed below the inflow tank 3, so that the water storage capacity can be increased as much as possible.
[0017]
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 simple and inexpensive. It is possible to appropriately perform the individual water discharge while simplifying the water discharge (outflow) structure in which the second water flow portion 62 is provided separately from the first water flow portion 61 and the third water flow portion 63, etc. There are advantages.
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 in a dynamic way. In other words, in this case, the inflow of large stones and debris is well prevented by the gratings installed in normal rainfall, and the water is freely discharged up to the water amount corresponding to 70 to 80% of the allowable discharge flow. Then, at the time of flooding such as flooding, the flood control device 1 can accurately prevent the adverse effects caused by the rapid rising of water downstream. 33 is a strainer provided on the inflow side of the siphon pipe 32 of the first flowing water section 61.
[0018]
4, FIG. 5 is a plan view and a sectional view of a regulating reservoir showing the implementation of the invention, the inlet tank 3 for receiving the water flow from the water flow path 2 in the middle of the flowing water channel 2 is provided in this example, the flow Iriso 3 A second storage tank 5 is provided below the inflow tank 3 for receiving and storing overflowing water from the tank and near the bottom of the peripheral wall of the storage tank 5 and drained downstream with a discharge amount corresponding to the water level of the storage tank 5. This is common to the previous two examples in that a flowing water portion 62 is provided and that the water flows into the downstream water passage 2b when the water level of the inflow tank 3 rises.
[0019]
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 penetrates the inflow tank 3 covered with the grating 36 from upstream to downstream. and, we put in the inlet tank 3 shape (or even an arcuate possible) forms a overflow adjustment unit 2d bent in, it exceeds the water level h ₁ increasingly water flow of flowing water channel 2, this overflow The water overflows from the flow part 2 d by the excess flowing water and flows out into the inflow tank 3.
[0020]
When the water level in the overflow adjustment portion 2d is h ₁ below without flowing into the inlet tank 3, downstream water passage flows within the first flowing water unit 61 constituted by overflow adjustment unit 2d itself spillway 2 Drained to 2b side. When the water level in the inflow tank 3 reaches a drain 64 formed by a drain 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 with increased water more reliably at the bent portion when the amount of water in the water channel 2 increases.
[0021]
The storage tank 5 has upper and lower two-stage bottom portions 57a and 57b as shown in the drawing, and the upper bottom portion 57a can have a structure that allows a certain amount of inflow water to penetrate underground as a water-permeable structure. Similarly, the storage tank side wall 50 on the inflow tank 3 side can also 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 on the lower side bottom portion 57 b of the storage tank 5 in an L-shape in plan view at a corner of the downstream side wall 53. A drainage space 56 having a cylindrical shape is formed at the bottom. Reference numeral 59 denotes a screen for collecting suspended solid effluent and the like formed on the downstream side of the storage tank 5 so as to surround the upstream side of the overflow wall 54.
[0022]
A hole for draining the water flowing into the storage tank 5 to the drain space 56 is formed as a second drain portion (orifice) 62 at a lower portion of the overflow wall 54, and the water level h exceeds the drain portion 62. _{When the} pressure exceeds ₄ , the second drainage section 62 drains water at a discharge pressure corresponding to the height of the water level in 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. Overflow drains into 56.
[0023]
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 channel 2e downstream.
[0024]
When the amount of water in the water channel 2 increases due to an increase in rainfall or the like due to the above configuration, in addition to the water flowing downstream by the water channel 2 itself, the increased water is stored in the storage tank 5 via the drainage portion 64 of the inflow tank 3. In response to a change in the water level (change in the amount of stored water), the water is discharged downstream from the second flowing water portion 62 or further through the third flowing water portion 63 from the flowing water portion 58. The weight is adjusted until the water level reaches the maximum water level h.
In the description of each of the above embodiments, the same reference numerals are used for portions having the same technical configuration and function as those described above, and the description of the following portions is omitted.
[0025]
【The invention's effect】
According to the device of the present invention configured as described above, when water in a drainage channel is increased mainly due to an increase in rainfall in an apartment complex or other development area, only the increased water is separated and stored. Since the water is discharged while adjusting, there is no need for a large-capacity inflow tank or storage tank as compared with the method in which all the water in the drainage is discharged while being stored, and there is an advantage that the entire apparatus can be downsized.
For this reason, it can be installed using a relatively small space such as a U-shaped ditch in a city area or the like near a drainage channel, and the possibility of installation in a large number of places is increased, so that the effect of installing the device is further enhanced. Can be.
In addition, while the storage tank can be downsized, 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.
[0026]
Further, by providing the overflow control section in the water channel itself, it is not always necessary to provide an inflow tank for receiving the increased overflow water in the water channel.
And 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 control 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 according to the rise in the water level in the storage tank. There is an advantage that the storage space of the storage tank can be more effectively used.
In addition, since there is no manual adjusting unit or setting unit provided in the storage tank or the diversion adjusting unit, there is an advantage that there is less human operation error.
[0027]
In addition to the above, storage tanks are flooded only during heavy rainfall, for example, about 1 to 3 times a year, so depending on the design method, they may be incorporated as part of a park or outdoor activity facility, etc. Available as Further, 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 not required, and no maintenance cost is required.
[Brief description of the drawings]
1 is a perspective view of a flood adjuster.
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;
Perspective view of the flood control apparatus according to the implementation embodiments of the present invention; FIG.
FIG. 5 is a cross-sectional view showing a main part of the device of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flood control device 2 Flow channel 2a Upstream channel 2b Downstream channel 2c Side channel 2d Overflow control section (diversion control section)
3 Inflow tank (diversion control section)
5 storage tank 32 water pipe (siphon pipe)
35 water storage space 50 side wall 55 water passage hole 61 first flowing water section 62 second flowing water section 63 third flowing water section 64 drainage section

Claims (3)

When the flow rate from the upstream side exceeds the predetermined flow rate in the middle of the flowing water channel (2), a branch flow adjusting unit is provided for branching the increased flow amount to another flow path, and the downstream of the branched flow water is provided. 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 controlling the discharge of the stored water to the downstream side, and upstream of the flowing water channel (2). A state in which the flow rate of the flowing water channel (2) exceeds a predetermined flow rate by bending or bending in plan view between the side water channel (2a) and the downstream water channel (2b) to form an overflow adjusting portion (2d). And a flood control device configured to divert the flowing water of the increased flow rate into the flow path on the storage tank (5) side in the overflow control section (2d) . 2. The flood control device according to claim 1, wherein the flow channel (2) is provided 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). The storage tank (5) is provided with a second flowing water part (62) that discharges and discharges 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. Item 6. The flood control device according to item 1 or 2.

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