JP3495785B2 - Quantitative water diversion system for intake or sewer system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quantitative water diversion system of a water intake or sewer system used for diversion of surplus water in sewage or the like to maintain a constant flow rate.

[0002]

2. Description of the Related Art In a sewer system such as a rainwater mixing type sewer pipe, a part of water is divided into a sewerage treatment facility using a quantitative water diversion device in order to reduce the burden on the sewerage treatment facility in case of rain. Is released to general rivers. As a quantitative water diversion device of this type, conventionally, a horizontal crossover as shown in FIGS. 7a and 7b is used. As shown in the same figure, one side wall of a concrete wall 1 having a rectangular cross section that defines a water channel 2 is cut out in a rectangular shape so that a lower edge projects from the bottom surface of the water channel 2 to a predetermined height. As the ridge 3a, excess water is passed over the ridge 3a and diverted to a diversion channel (not shown) to prevent the sewage treatment facility from flowing more water than the set amount corresponding to its treatment capacity. is doing.

[0003]

However, in the above-mentioned quantitative water diversion device, the notch 3 opens at a right angle to the flow of water in the water channel 2 and the weir 3a forms the flow of water in the water channel 2. Since they extend in parallel, the flow of water (diversion) over the weir 3a is also influenced by the flow velocity in the water channel 2 and becomes a jet flow obliquely downward to the downstream side of the water channel 2 as shown by the arrow in the figure. Therefore, when the flow rate on the upstream side in the water channel increases (the flow velocity increases), the flow rate of water flowing to the downstream of the water channel 2 without exceeding the weir 3a also increases as shown by the broken line in FIG.
It was difficult to maintain the flow rate on the downstream side within the set flow rate.

Therefore, in the conventional quantitative water diversion device, the size in the flow direction of the weir 3a (F in FIG. 7a) is enlarged to take measures against it, but the problem of increasing the size of the sewage diversion hole is caused. Cause Specifically, the width is 2.5 m and the height is 1.3.
If the water channel 2 is 4 m and the height of the weir 3a is 11 cm, the length of the weir 3a must be configured to be about 12.8 m, and it is inevitable that the sewage diversion hole is enlarged. Further, since the construction of the diversion manhole must be carried out on a road where there are many underground buried objects at an intersection where traffic is complicated, the above-mentioned problems have caused an increase in construction cost and a longer construction period. The present invention has been made in view of the above circumstances, and can maintain a constant flow rate on the downstream side regardless of the flow rate on the upstream side of the waterway, and also can reduce the size of the diversion hole and save construction costs. It is an object of the present invention to provide a quantitative water diversion device of a water intake or sewer system that can shorten the construction period.

[0005]

In order to achieve the above object, the water intake or sewer system quantitative water diversion device according to the invention of claim 1 has a plurality of square openings communicating with the water diversion channel at the bottom of the water channel. It was provided so as to be orthogonal to the water flow direction, a weir having a predetermined height was formed at the edge of the opening, and a right-angled meandering water passage was formed at the bottom of the water passage by the plurality of openings.

Further, in the quantitative water diversion system of the intake or sewer system according to the invention of claim 1, the width dimension of the right-angled meandering water channel portion is set to 1/5 to 1/4 of the width dimension of the water channel. (Claim 2).

Further, in the quantitative water diversion system of the intake or sewer system according to the third aspect of the present invention, a drop hole communicating with the water diversion channel is provided in the water channel, and the water channel upstream and downstream of the drop hole is located on the side of the water drop channel. The edge was continuous with the connecting water channel partitioned by the weir of a predetermined height, and a right-angled meandering water channel section orthogonal to the water flow direction was formed in the connecting water channel.

[0008]

According to the water diverter according to the first aspect of the present invention, the surplus water flowing in the water channel collides with the weir at a right angle when flowing through the right-angled meandering water channel part and crosses the weir. Even when there is a large amount (when the flow velocity is high), a large amount of water can be made to flow from the opening to the water diversion channel, the flow rate on the downstream side of the water channel can be maintained constant, and the area of the opening can be reduced. Therefore,
The water diversion hole can also be downsized, which saves construction costs and shortens the construction period.

According to the water diverter of the third aspect,
Excess water flowing through the connecting waterway hits the weir at a right angle when flowing through the right-angled meandering waterway, crosses the weir, and flows from the pit into the diversion channel. Therefore, when the surplus flow rate is large, a large amount of water can be made to flow in the diversion channel, and the flow rate on the downstream side of the water channel can be maintained constant. Therefore, the length of the connecting water channel and the opening area of the drop hole can be reduced, the diversion hole can be downsized, the cost for construction can be reduced, and the construction period can be shortened.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a quantitative water diversion device of a water intake or sewer system according to a first embodiment of the present invention, FIG. 1a is a plan view, and FIG. 1b is an operation in which the flow of water is shown by arrows in FIG. 1a. 2A is a sectional view taken along the line AA of FIG. 1A, FIG. 2B is a sectional view taken along the line BB of FIG. 1A, and FIG. 2C is a sectional view taken along the line C-C of FIG. 1A. .

In the figure, 10 is a rectangular concrete wall 11
Is a sewage channel with a rectangular cross section, and 20 is a diversion channel with a rectangular cross section defined by a rectangular concrete wall 21 and extending below the sewage channel 10. These sewage channels 10 and diversion channels 20 are partially installed side by side, sharing the bottom wall of the concrete wall 11 and the top wall of the concrete wall 21.
The shared concrete wall portion 30 is formed with two openings 31 and 32 that connect the sewage channel 10 and the diversion channel 20.

As shown in FIGS. 1a and 1b, the openings 31 and 32 are separated from each other in the flow direction of the sewage canal 10 and are displaced in the direction perpendicular to the flow direction, and are arranged in a staggered manner and form a right-angled meandering. A water channel portion 99 is formed. Each of these openings 31 and 32 has a rectangular shape defined by a side parallel to the flow direction of the sewage water channel 20 and a side orthogonal to the flow direction, and a weir portion having a predetermined height along the entire circumference at the peripheral edge on the sewage water channel 10 side. 31a, 32
a is formed. These coughs 31a and 32a are
It has a rectangular shape similar to the openings 31 and 32, and has a sewerage channel 10.
The upstream / downstream side portion extends in a direction orthogonal to the flow direction.

The width W _{1 of} the opening 31 in the width direction of the sewer channel 10 is 3/4 to 4/5 of the width W ₀ of the sewer channel 10.
Similarly, the opening 32 has a dimension W _{2 in the} width direction of the sewer channel 10.
Are formed at 3/4 to 4/5 of the width dimension W ₀ of the sewer channel 10. As concrete dimensions, when corresponding to the above-mentioned conventional dimensions, the dimension W ₀ is 2.5 m, and the dimensions W ₁ and W _{2 are}
Is 1.9 m, and the vertical dimension L ₁ of the opening 31 is 1.5
m, the vertical dimension L ₂ of the opening 32 is 2.5 m, the opening 31,
The distance L ₃ between the 32 is 1.5 m, and with this dimension setting, a water diversion hole is formed with a length of 5.5 m (l in the figure).

In the first embodiment, the sewer 10
If the flow rate on the upstream side exceeds the set flow rate that should flow to the downstream side, the water flows as shown by the solid line and the broken line arrow in FIG. 1b, and excess water is diverted from the openings 31, 32 to the water diversion channel 20. To be watered. Here, as shown by the broken line arrow in the figure, the excess water hits the weirs 31a and 32a of the openings 31 and 32 at a right angle and crosses the weirs 31a and 32a, so that the flow rate is large. That is, when the flow velocity is high, a large amount of water according to the flow velocity can flow from the openings 31 and 32 to the water diversion channel 20. Therefore, the flow rate on the downstream side of the sewer channel 10 can be maintained at the set flow rate as shown by the thick solid line in FIG. Since the openings 31, 32 can divert a large amount of water to the water diversion channel 20 even when the amount of surplus water is large, the openings 31, 32 are formed.
Can reduce the size (area) of the
It is possible to shorten the construction period and save costs. Note that FIG.
Shows the measured flow rate in the 1/5 model of the above-mentioned concrete dimension.

If the flow rate on the upstream side of the sewage channel 10 is less than or equal to the set flow rate to be flown on the downstream side, the water flows through the right-angled meandering channel section 99 and the opening 31 as shown by the solid arrow in FIG. 1b. , 32 to the downstream side without flowing into.

According to the experiment by the inventor of the above-mentioned 1/5 model, the width dimension of the right-angled meandering water channel portion 99, that is, the dimension W _{0 in the} width direction of the channel 10 to the dimension W in the width direction of the openings 31, 32. _The value obtained by subtracting ₁ and W ₂ (W ₀ −W ₁ ) is 12c.
Table 1 shows the characteristics shown in Table 1 when m (60 cm in actual size) is set, and Table 2 shows that the width dimension of the right-angled meandering waterway section 99 is set to 16 cm (80 cm in actual size). The characteristics were obtained and its excellent water diversion performance was demonstrated. The unit in Tables 1 and 2 is 1 / S.

[0017]

[Table 1]

[0018]

[Table 2]

FIG. 3 is a schematic plan view of a quantitative water diversion system for a water intake or sewer system according to a second embodiment of the present invention. In addition, regarding the second embodiment and other embodiments described later, the same parts as those in the above-mentioned first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the second embodiment, three rectangular openings 33, 34, 35 are provided on the bottom wall of the water channel 10 to communicate with the water diversion channel 20. These openings 33, 34, 35 are arranged in a staggered manner, that is, the openings 33 are located at the center of the water channel 10 in the width direction.
The openings 34, 35 are in contact with the side walls of the water channel 10 and are arranged at intervals in the center in the width direction. Then, as described in the above-described first embodiment, each of the openings 33, 34, 35 has a rectangular weir 33a, 34a, 3 at the periphery similar to the opening shape.
5a is formed so that the pair of opposite sides are in the flow direction and the other pair of opposite sides is orthogonal to the flow direction.
A right angle meandering water channel portion 99 is formed by 3, 34 and 35.

In this embodiment, the opening 33
The dimension M ₃ is 3/4 to 4/5 of the width W ₀ of the water channel 10,
Further, the openings 34 and 35 are the sum of the width dimensions M ₄ and M ₅ (M ₄
+ M ₅ ) is formed to be 3/4 to 4/5 of the width dimension W ₀ of the water channel 10.

Also in this second embodiment, when the flow rate on the upstream side of the water channel 10 exceeds the set water amount, excess water is generated in each of the openings 33, 34, as shown by the broken line arrow in the figure. 35
It strikes the weirs 33a, 34a, 35a at a right angle and crosses the weirs 33a, 34a, 35a, and the openings 33, 34,
From 35 to diversion 20. Therefore, when the flow rate on the upstream side of the water channel 10 is large, a large amount of water corresponding to the flow rate can be divided, and the water amount on the downstream side can be reliably maintained at the set water amount.

FIG. 4 is a schematic plan view showing a quantitative water diversion system of a water intake or sewer system according to a third embodiment of the present invention. In this third embodiment, one side wall side of the water channel 10 is partially expanded on the water diversion channel 20 into a rectangular shape, and an opening 36 is opened from the other side wall of the water channel 10 to the central portion of the expansion section 19, and an expansion. An opening 37 that opens at the end of the portion 19 is formed at a distance. Similar to the above-mentioned embodiments, these openings 3
Reference numerals 6 and 37 form rectangular shapes, and the weir portions 36a and 37a, which partially face the flow of water, are formed in the peripheral edge thereof, and form a right-angled meandering water channel portion 99.

Also in the third embodiment, when the flow rate upstream of the water channel 10 exceeds the set water amount, excess water strikes the weirs 36a, 37a at a right angle, and the weirs 36a, 3a.
7a, and flows into the diversion channel 20 through the openings 36 and 37. Therefore, even if the flow rate on the upstream side is large, the amount of water can be divided according to the flow rate, and the flow rate on the downstream side of the water channel 10 can be maintained at the set flow rate.

In the above-mentioned embodiment, the rectangular opening is illustrated, but the shape of the opening is not limited to the rectangular shape, and the triangular shape is arranged so that the water strikes one side at a right angle. Alternatively, a half-moon shaped opening or the like can be adopted, and the shape is appropriately selected.

FIGS. 5a and 5b show a water diversion or sewer system quantitative water diversion device according to a fourth embodiment of the present invention, in which a is a schematic plan view and b is a view taken along the line DD of FIG. In the fourth embodiment, a water channel 10 is composed of a pipe defined by a cylindrical tube 17, and the water channel 10 is a drop hole 9 that opens to a diversion channel 20.
At 0, it is divided into an upstream portion 10a and a downstream portion 10b.
In the water channel 10, the upstream portion 10a and the downstream portion 10b are connected by a gutter member (communication water channel) 16.

The gutter member 16 has the same curvature as that of the pipe 17, and
7 is formed in a partially arcuate shape continuous to the bottom, and is arranged at 9 points at 4 points on the drop hole 90 so as to be orthogonal to the flow direction of water in the water channel 10.
It bends at 0 degrees to form a right-angled meandering water channel portion 99. The side edge of the gutter member 16 constitutes a weir.

In the fourth embodiment, when the flow rate in the upstream portion 10a of the water channel 10 exceeds the set flow rate, a part of the surplus water will be in the upstream portion 1 as indicated by the broken line arrow in the figure.
0a directly into the drop hole 90, and the gutter member 16
Excess water flowing through the side wall of the gutter member 16 strikes the side edge of the gutter member 16 at a right angle, crosses the side edge, and flows into the drop hole 90. Therefore, similarly to each of the above-described embodiments, when a large amount of water flows into the gutter member 16 from the upstream portion 10a, the amount of water according to the flow rate can be dropped into the hole 90, and the flow rate of the downstream portion 10b can be set to the set flow rate. Can be held at

In the fourth embodiment described above, the gutter member 1
Although 6 is bent with a predetermined curvature, it is also possible to bend it at a right angle, as shown by an imaginary line in FIG. 5a.
Further, in each of the above-described embodiments, an example in which the present invention is applied to sewage will be described, but it goes without saying that the present invention can be applied not only to sewage but also to tap water or water intake for irrigation.

[0030]

As described above, according to the quantitative water diversion system of the intake or sewer system according to the invention described in claim 1, the surplus water flowing in the water channel hits the weir at right angles. Since the water exceeds the weir, a large amount of water can flow from the opening to the diversion channel according to the flow rate when the amount of surplus water is large and the flow rate is high, and the flow rate on the downstream side of the water channel can be maintained constant.
The area of the opening can be reduced. Therefore, the water diversion hole can also be downsized, the cost for construction can be reduced, and the construction period can be shortened.

Further, according to the water intake or sewer system quantitative water diversion device according to the third aspect of the present invention, the surplus water flowing through the connecting water channel hits the weir at a right angle, crosses the weir, and falls. Therefore, when the excess flow rate is large, a large amount of water can be flown into the diversion channel according to the flow velocity, and the flow rate on the downstream side of the water channel can be maintained constant. Therefore, the length of the connecting water channel and the opening area of the pit can be reduced,
The diversion hole can be downsized, and the construction cost can be reduced.
In addition, the construction period can be shortened.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a water intake or sewer system quantitative water diversion device according to a first embodiment of the present invention, a is a schematic plan view, and b is an operation explanatory view showing a flow of water by an arrow in FIG. 1 a. is there.

FIG. 2 is a cross-sectional view of the identified water diversion device, where a is a cross section taken along the line AA of FIG. 1a, b is a cross section taken along the line BB of FIG. 1a, and c is a cross section taken along the line C-C of FIG. 1a. Indicates.

FIG. 3 is a schematic plan view of a quantitative water diversion system for a water intake or sewer system according to a second embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a quantitative water diversion device of a water intake or sewer system according to a third embodiment of the present invention.

FIG. 5 shows a quantitative water diversion device of a water intake or sewer system according to a fourth embodiment of the present invention, in which a is a schematic plan view and b is a DD arrow view of a.

FIG. 6 is a graph showing the relationship between the flow rate upstream of the water channel and the flow rate downstream of the water channel in the 1/5 model.

FIG. 7 shows a conventional quantitative water diversion device of a water intake or sewer system, in which a is a schematic side view and b is a sectional view.

[Explanation of symbols]

10 water channel 11 concrete wall 10a upstream portion 10b downstream portion 16 gutter member (connecting water channel) 20 water diversion channel 21 concrete wall 31, 32, 33, 34, 35, 36, 37 opening 31a, 32a, 33a, 34a, 35a, 36a , 3
7a Weir 90 Drop hole 99 Right angle meandering waterway

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E03B 3/02 E03F 1/00 E03B 7/07 E02B 13/00

Claims (3)

(57) [Claims] 1. A plurality of quadrangular openings communicating with a water diversion channel are provided on a bottom surface of a water channel so as to be orthogonal to a water flow direction, and a weir having a predetermined height is formed at an edge of the water opening. A right-angled meandering water channel portion is formed on the bottom of the water channel by means of a water intake or sewer system quantitative water diversion device. 2. The quantitative water diversion system of the intake or sewer system according to claim 1, wherein the width dimension of the right-angled meandering water channel portion is set to 1/5 to 1/4 of the width dimension of the water channel. 3. A drop hole communicating with the diversion channel is provided in the middle of the water channel, and the water channel upstream and downstream of the drop hole is continuous with a connecting water channel whose side edge is divided by a weir of a predetermined height. A quantitative water diversion device for a water intake or sewer system, characterized in that a right-angled meandering water channel portion that is orthogonal to the water flow direction is formed in the connecting water channel.