JPH108437A - Dust protection equipment for drainage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide dust protection equipment, by which lowering of drain performance of a drainage system can be prevented so as to keep high reliability. SOLUTION: A rotary disc screen 122 is provided on a branch part of a detour channel 4, and a float 101 is disposed vertically above the screen to dam a surface layer flow. Thus, a water cut-off staying water area 201 is produced in front (upstream) of the float main body and a skirt, in which dust 301 is trapped. After that, the dust 301 is surely drifted with a water flow produced by a stream generating device 107 from a branch part to the downstream in a river 1 to be removed from the front of the float 101. The dust is accumulated in a sump 202 by a collecting net 203, and suitably selected to be carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for draining river water by providing a detour channel in a river, and more particularly to a dustproof system for a drainage system for preventing dust from flowing into a pump. .

[0002]

2. Description of the Related Art FIG. 13 shows a layout plan view of a general drainage system of this kind in which a detour water channel is provided in a river and a drainage station is provided on the way. The drainage system shown in FIG. 13 is a main waterway (or waterway, the same applies hereinafter) 1 and a large river (or large waterway or ocean,
A main waterway gate 3 is provided at a connection portion with the same 2), and a detour waterway 4 is cut open. And the detour channel 4
A drainage station 5 equipped with a drainage pump is provided on the way, and a bypass channel 6 is provided at the connection between the bypass channel 4 and the large river 2. In the event of a flood such as heavy rain or a typhoon, the main waterway gate 3 is closed, the bypass waterway gate 6 is opened, and the turbid water of the river 1 is drained into the large river 2 by the drain pump installed at the drainage station 5, and the flooding of the basin of the river 1 is performed. Prevent damage. In addition, in this drainage system, dust is trapped in order to prevent dust that floats and flows down the river 1 from flowing into the drainage station 5 from the bypass channel 4 and breaks or blocks the drainage pump to disable drainage operation. Dustproof equipment 7 equipped with a screen (usually a bar screen)
Are arranged near the branching point branching off from the river 1. The mesh width of the screen of the dustproof equipment 7 is set to be equal to or less than the size of the dust, which may impede rotation due to blockage of the impeller (or bite in the narrow portion of the pump) when the pump sucks, thereby making it impossible to operate. ing.

[0003] The dust thus captured on the screen of the dustproof equipment 7 is usually, for example, every predetermined period, for example,
It is removed by an automatic dust remover attached to the screen as described on page 96 of "Sewerage course 3: Design and concept of pumping station" (Kashima Publishing Co., Ltd.), edited by the Book Sewer Design Materials Research Group. In this automatic dust remover, an endless chain provided with several scrapers runs on a screen provided in a substantially vertical direction on the water surface, and scrapes and removes dust trapped on the front surface of the screen by the scrapers. In other words, when the scraper on the endless chain reaches a position where it turns around near the upper end of the screen,
The garbage falls from the scraper onto a belt conveyor installed below the position where the scraper is inverted. Then, the garbage is put on a belt conveyor, sent to a hopper, collected, and disposed of as industrial waste outside the drainage plant.

[0004]

However, the above-mentioned conventional configuration has the following problems. That is, the dust trapped on the screen is pressed against the screen by the pressure of the flowing water flowing down the bypass channel 4. Therefore, in order to scrape and remove dust on the screen with a scraper as described above, it is necessary to scrape against the frictional force due to the pressing force, and the force may increase to several tons or more. In addition, this frictional force depends on the coefficient of friction between the dust and the screen besides the pressing force by running water.
They come in a wide variety of shapes, such as water carriers and plastics, and some have very high coefficients of friction.
Therefore, in such cases, the frictional force becomes extremely large, and the driving motor of the scraper may overload and trip, making it difficult to maintain good performance of the dust remover. When the performance of the dust remover is reduced, dust accumulates on the screen of the dustproof facility and impedes water flow, so that the water permeability of the bypass water channel is reduced, and it becomes difficult to maintain the drainage performance of the drainage system. Since the drainage system is operated in the event of a typhoon or heavy rain to prevent flooding of the river, its reliability needs to be further improved.

[0005] It is an object of the present invention to provide a dustproof system for a drainage system that can prevent a decrease in drainage performance of the drainage system and maintain high reliability.

[0006]

In order to achieve the above object, according to the present invention, there is provided a main waterway gate provided at a downstream portion of a main waterway, and a drainage pump provided branching from the main waterway. A detour waterway, and a screen installed in a drainage system having a detour waterway gate provided downstream of the detour waterway, a screen disposed near a branch where the detour waterway branches off from the main waterway, In a dustproof facility of a drainage system for preventing inflow of dust from a waterway to the bypass waterway, the dustproof equipment is provided in a water surface position near the screen so as to be able to float up and down, and stops a surface flow near the branch portion and stays upstream at a portion. And a water flow generating means for generating a water flow in a width direction of the floating member at the stagnation portion. In other words, during a flood such as heavy rain or a typhoon, the main waterway gate downstream of the main waterway is closed, and the bypass waterway gate downstream of the bypass waterway is opened, and the turbid water in the main waterway is discharged through the bypass waterway by a drainage pump. Prevent flood damage in the watershed basin. At this time, the water carrier, wood,
Garbage such as plastics flows down in the main waterway together with the turbid water. However, since they generally have a lower specific gravity than water, they flow down the surface of the turbid water by buoyancy. Then, together with the turbid water, an attempt is made to flow into the bypass waterway from the branch portion of the bypass waterway. Here, in the present invention, along with providing a screen at this branch portion, providing a floating member at a water surface position in the vicinity thereof, damping the surface layer flow and forming a stagnation portion on the upstream side, most garbage,
It is trapped in this stagnation portion. Further, a water flow is generated by the water flow generating means in the stagnant portion in the width direction of the floating / sinking member. At this time, the water flow generated from the water flow generation means is:
When traveling, at the boundary of the stagnation portion, the force of the flow flowing down from the main water channel toward the floating and sinking member is constantly maintained, so that the flow does not diffuse and lose its momentum far away from the water flow generating means. In other words, the water flow generating means can effectively create a water flow that flows toward the downstream side of the main water channel in the width direction of the floating / sinking member. This allows the trapped refuse to flow downstream of the branch in the main waterway. Therefore, for example, if a collection site is provided downstream of the branch in the main waterway to collect garbage,
Independently of the dust protection, the accumulated dust can be pulled out of the water channel at an appropriate time. In addition, since the floating member can float vertically, the stagnation portion can always be formed in the surface layer flow even if the water level changes due to, for example, flooding. Also, since the screen and the floating members in the vicinity thereof are arranged together, for example, if a plurality of floating members are arranged so as to divide the entire width of the bypass channel, the function of the screen is insufficient and the dust is locally generated. Even if water accumulates and the water flow deteriorates, the water level on the front surface of the screen element in that portion rises and the corresponding floating / sinking member rises more, thereby preventing blockage of the portion and ensuring water flow. .

[0007] Preferably, in the dustproof equipment for the drainage system, a plurality of the floating and sinking members are arranged so as to divide the entire width of the bypass water channel.

[0008] Preferably, in the dustproof equipment for the drainage system, there is provided dustproof equipment for the drainage system, wherein the floating member is a float that floats following a change in water level.

[0009] Preferably, in the dustproof equipment of the drainage system, there is provided the dustproof equipment of the drainage system, wherein the floating member is a gate driven to a predetermined height position by a driving means. Thus, for example, if the driving is controlled so that the gate insertion depth is constant, the width of the staying portion can be constant.

More preferably, in the dustproof equipment of the drainage system, when the water level of the floating member is relatively high, the lower end of the floating member is located at substantially the same height direction as the upper end of the screen, and the water level is lower. When relatively low, the lower end of the floating member is lower than the upper end of the screen, and at least a part of the floating member is configured to cover the screen. Facilities are provided.

Preferably, in the dustproof equipment of the drainage system, the screen includes a plurality of screen elements arranged in a width direction of the bypass water channel, and each screen element is a rotating disk substantially parallel to a water surface. A dustproof facility for a drainage system is provided, wherein the member is attached at a plurality of positions in a vertical direction at predetermined intervals.

More preferably, in the dustproof equipment of the drainage system, at least one of the plurality of screen elements is radially attached to a vertical axis that is a rotation center of the rotating disk-shaped member, A dustproof facility for a drainage system is provided, wherein a plurality of blades functioning as a centrifugal pump are provided therearound. Thereby, the separation of dust from the corresponding screen element can be facilitated. Therefore, for example, if the screen element on the most downstream side of the main waterway is configured in this way,
Separation and discharge of dust from the rotating disk screen to the downstream side of the main waterway can be performed smoothly.

Preferably, in the dustproof equipment of the drainage system, at least one of the plurality of screen elements includes a rotating cylindrical member having the same rotation center as the rotating disk-shaped member. Wherein the rotating disk-shaped member is fixed to a plurality of vertical positions on the outer peripheral surface of the rotating cylindrical member. For example, when the disk-shaped members of adjacent screen elements are arranged so as to overlap with each other in order to more reliably capture dust in the screen, the configuration in which the rotary disk-shaped member is directly fixed to the rotating shaft is 1.
The width that can be earned by one screen element is relatively small and limited, and the number of screen elements required to compose the screen becomes enormous. Therefore, by providing a rotating cylindrical member around the rotation axis and fixing the rotating disk-shaped member to the outer peripheral surface thereof, the width that can be earned by one screen element is increased, and the screen element required to constitute the screen is increased. Can be reduced.

[0014] More preferably, in the dustproof equipment of the drainage system, a dustproof equipment of the drainage system is provided, wherein a slit is formed on an outer peripheral surface of the rotary cylindrical member. Accordingly, it is possible to suppress the rotation cylindrical member from becoming a water flow resistance and to reduce a water flow area, thereby ensuring water flow.

Preferably, in the dustproof equipment for the drainage system, there is provided a dustproof equipment for a drainage system, wherein the water flow generator is a propeller type water flow machine.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention.
This will be described with reference to FIG. The same reference numerals are given to members equivalent to those in FIG. FIG. 1 is a front view showing the entire structure of the dustproof equipment 100 according to the present embodiment, and FIG. 2 is a horizontal sectional view thereof. 1 and 2, the dustproof equipment 100
Is provided at the entrance of the bypass waterway 4 in the drainage system described above with reference to FIG. 13, that is, at the branch from the river 1 which is the main waterway. Multiple floats 1 as
01, a rotating disk type screen 122 located below the float 101, and a water flow generating device 107 as a water flow generating means disposed on the front surface (upstream side) of the float 101. Each structure and function will be described below.

First, the float 101 will be described.
The float 101 functions to block the surface flow of muddy water near the branch of the bypass waterway 4 and generate a still water stagnant water area 201 (see FIG. 2) on the front surface (upstream side) thereof.

Each float 101 is a float body 101a which is a hollow structure having an outer frame formed of a steel plate or the like, for example.
And a skirt 101 extending vertically downward from both front and rear surfaces thereof
and b are integrally formed, and furthermore, they move up and down along the plurality of guide rods 101c and can float following the water level change. 3A and 3B are side sectional views showing the detailed structure of the float 101. FIG. FIG.
3A corresponds to a state where the float 101 is rising, and FIG. 3B corresponds to a state where the float 101 is falling. For the sake of clarification of the structure, the inside of the skirt 101b is partially shown in cross section in both figures. As shown in FIGS. 3A and 3B, stoppers 101d are attached to the upper end and the lower end of the guide rod 101c, respectively, so as to regulate the vertical movement width of the float 101. Thus, no matter how high the water level is, when the lower end of the float 101 reaches the same height direction position as the upper end of the rotating disk type screen 122, the lift stops and the float does not rise excessively. I have. When the water level is low, the lower end of the float 101 is lower than the upper end of the rotating disk type screen 122, and the float 101
At least partially covers the rotating disk type screen 122, that is, is housed in the disk type screen 122 in the skirt 101b of the float 101.
Also in this case, no matter how low the water level is, the float 101 does not close the water channel by the function of the stopper 101d.

Next, the rotating disk type screen 122 will be described. The rotating disk type screen 122 is disposed below the water path of the float 101 to remove dust 301 in the dive water flow of the float 101. The upper end of the rotary screen 122 extends above the water surface while penetrating the float 101, and will be described later. Rotating shaft 102c connected to a timing belt 104 to be rotated, and a rotating cylinder 1 provided on the rotating shaft 102c.
02a, and a saw-toothed rotating disk 1 attached to a plurality of vertical positions of the rotating cylinder 102a and substantially parallel to the water surface.
A plurality of first screen elements 102 composed of 02b are arranged in the width direction of the bypass channel 4. Further, on the downstream side of the river 1 from the first screen element 102, a vertical rotating shaft 105c having an upper end extending above the water surface while penetrating the float 101, and attached to a plurality of vertical positions of the rotating shaft 105c. And a second screen element 105 composed of four rotating blades 105a mounted radially from the rotating shaft 105c and serving as a centrifugal pump around the rotating shaft 105c. Are arranged. The second screen element 105 has a function of separating the dust 301 by the pump action of the blade 105a and forcing the dust 301 to flow downstream. Thereby, the rotating disk type screen 1
The separation and discharge of the refuse 301 from the river 22 to the downstream side of the river 1 can be performed smoothly. FIGS. 4A and 4B are a plan view and a side view showing the detailed structure of the first and second screen elements 102 and 105, respectively.

At this time, in the first screen element 102, the rotating disk 102b is fixed to the rotating cylinder 102a so that the width that can be earned by one screen element is increased. The number of first screen elements required to construct the screen 122 is reduced. Further, slits 102d are provided in a substantially vertical direction on the outer peripheral surface of each rotating cylinder 102a, thereby suppressing the rotating cylinder from becoming a water flow resistance and reducing a water flow area, thereby ensuring water flow. At this time, each screen element 102 (or 105) is connected to the rotating disk 102b (or 10) of the adjacent screen element 102 (or 105).
5b) During the drainage operation, when the pump sucks, the gap becomes smaller than the size of the garbage, which may cause the impeller to be blocked or bite into the structural gap to prevent the drainage operation.
They are arranged so as to overlap in the width direction (see FIG. 1), so that the dust 301 is reliably trapped.

All these screen elements 102,1
During operation, the rotating disks 102b of 05 rotate in the same direction as shown in FIG. That is, in the first screen element 102, the driving force generated by the driving motor 103 provided above the float 101 is distributed to each rotating shaft 102c via the timing belt 104, and each rotating cylinder 102a and the rotating cylinder 102a The disk 102b is driven at a constant speed. As a result, the dust 301 trapped on the rotating disk type screen 122 moves downstream while changing the screen element 102 from left to right in FIG. In the second screen element 105, the driving force generated by another driving motor 106 provided above the float 101 is transmitted to the rotating shaft 105c, and the rotating disk 105b and the blade 1
05a is driven. This is feather 1
In general, the pump action of the second screen element 1a is greater as the rotation speed of the rotating shaft is higher.
This is because the refuse 301 can be smoothly separated by rotating the trash 05 at a higher speed.

Next, the water flow generator 107 will be described. The water flow generating device 107 generates a water flow in the width direction of the float 1 (= width direction of the bypass channel 4) in the water stoppage water area 201 by rotating a propeller 107c provided in the protective cover 107b, a so-called propeller type. It is a water jet machine. In order to always generate the water flow effectively in the surface layer of the still water area 201 in response to the water level change of the river 1, a float 107a for a water flow generator is attached above the protective cover 107b and floated on the water surface. It has become.

As shown in FIG. 1, the bypass waterway 4
Is generally divided into a plurality (three in this embodiment) of bypass waterways 4A by a center pier 4a. Therefore, in the dustproof equipment 100 of the present embodiment, the float 101 and the rotating disk type screen 122 are unitized according to the size between the center piers 4a for convenience of construction, and the unit is installed for each bypass waterway 4. That is, each unit includes three floats 101, five screen elements 102, and one screen element 10 arranged so as to substantially divide the entire width of each bypass water channel 4A into three.
5 is provided. The screen element 105 provided in each of the two units on the left side in FIGS. 1 and 2 serves to transfer the trapped dust 301 to the adjacent unit, and is provided in the rightmost unit in FIGS. 1 and 2. Only the screen element 105 plays a role in flowing the trapped dust 301 to the downstream side of the river 1.

The operation and effect of the dustproof equipment 100 according to the present embodiment configured as described above will be described below. A general drainage system provided with dustproof equipment 100 (FIG. 1)
3), for example, during a flood such as heavy rain or a typhoon, the main channel gate 3 downstream of the river 1 is closed, and the bypass channel gate 6 downstream of the bypass channel 4 is opened, and the muddy water of the river 1 is drained. The water is discharged through the bypass waterway 4 by the drainage pump in 5 to prevent flooding of the river basin. At this time, trash such as water carrier, wood, plastic,
The water flows down the river 1 together with the turbid water, but since the specific gravity is generally lower than that of the water, the water flows down the surface layer of the turbid water as refuse 301 by buoyancy. Then, together with the turbid water, an attempt is made to flow from the river 1 into the bypass waterway 4 at the branch of the bypass waterway 4. Here, in the dustproof equipment 100 of the present embodiment, a rotating disk type screen 122 is provided at the branch portion, and a float 101 is provided vertically above the branching screen 122 to block the surface flow. As a result, a water stoppage water area 201 is formed on the front surface (upstream side) of the float main body 101a and the skirt 101b.
reference).

This operation will be described in detail with reference to FIGS. When the float 101 blocks the flow, a water level difference occurs before and after the float 1. This water level difference x
Is known to be uniquely determined by the plunge depth y below the water surface of the float 1 shown in FIG. 5. For example, according to “Hydraulics” (Honma et al., Iwanami Shoten) P199, It is given by the relation of the expression. y = Ho−Q / (μb√ (2gx)) where Ho: water level upstream of the weir, Q: flow rate, μ: runoff coefficient (= 0.6), b: channel width, g: gravity acceleration. .

FIG. 6 specifically shows this relationship. FIG. 6 shows that the channel width b = 7 m and the amount of flowing water Q = 17.5.
In the case where m ³ / s (flow velocity = 0.5 m / s), the water depth Ho of the water channel is shown for two cases of Ho = 5 m and Ho = 3 m, respectively. As is clear from FIG.
It can be seen that the greater the penetration depth y of the float 101, the greater the water level difference before and after the float 101.
However, if the depth y is too large,
The water level Ho upstream of the float 101 is undesirably increased. For example, if the water level difference is suppressed to within 0.2 m, the plunge depth y of the float 101 is about y = 2.8 m when Ho = 5 m and about y = 1.7 m when Ho = 3 m. .

Here, according to the known flow analysis,
It is known that the range of the water stoppage water area 201 near the water surface in front of the float 1 is approximately proportional to the plunging depth (y) of the float 101. For example, according to the above calculation example, when Ho = 5 m and y = 2.8 m, the still water pool 2
01 is about 2.5 m in the direction toward the float 101 (see FIG. 2), Ho = 3 m, y = 1.7.
In the case of m, L ≒ 1.5 m is secured. When a water level difference is generated between the front and rear surfaces of the float 101, a water pressure corresponding to the water level difference acts on the float 101, so that the floats 101a and 101b and a guide rod 101c described later have strength enough to withstand this water pressure. Designed in advance. Thus, by forming the water stoppage water area 201 on the upstream side of the float 101, most of the dust 301 is trapped in the water stoppage water area 201.

Then, a water flow 204 is generated by the water flow generation device 107 in the water stoppage area 201 in the width direction of the float 101 (the width direction of the bypass channel 4). At this time, as the water flow 204 generated from the water flow generation device 107 proceeds, it continues to receive the force of the flow 205 flowing down from the river 1 toward the float 101 at the boundary of the still water area 201 (flow 205 As shown by the broken line in FIG. 2 itself, it sinks downward from the boundary of the still water stagnant water area 201), so that the flow does not diffuse and lose its momentum far away from the water flow generator 107. That is, the water flow generator 10
7 can effectively create a water flow along the float 101 toward the downstream direction of the river 1. Therefore, the dust 301 trapped in the float 101
Is the river 1 on the water flow generated by the water flow generator 107.
Since it is surely flushed to the downstream side of the branch portion in the inside and is removed from the front surface of the float 101, the sweeping of the dust 301 can be performed effectively and reliably.

On the other hand, some refuse 301 having a relatively high specific gravity
Penetrates below the water stoppage water area 201 on the front surface of the float 101 and is trapped by the rotating disk type screen 122. As described above, this trapped garbage 30
2 is transferred from left to right in FIG. 2 in the downstream direction of the river while changing between the screen elements 102 and being transferred to an adjacent unit by the screen element 105.
In the screen element 105 of the middle right end unit, the screen element 105 is separated by the pump action and discharged to the downstream side of the branch in the river 1.

As described above, all the dust 301 that floats down the surface layer and the bottom layer is flushed downstream of the river 1, and can be collected in the kiln 202 by the collection net 203 provided on the downstream side. It is temporarily stored here. Thereafter, the refuse can be sorted and carried out at an appropriate time independently of the dust proof.

In addition, since the float 101 can float up and down in the vertical direction, even if the water level fluctuates due to, for example, a flood, the water stoppage area 201 is always formed in the surface flow in response to the fluctuation. Can be. Therefore, it is more advantageous than the case where the fixed weir is provided at the end. Further, since the rotating disk type screen 122 and the float 101 above the rotary disk type screen 122 are arranged together, the rotating disk type screen 122 is temporarily provided.
Even if the function of the screen element 102 is insufficient and the dust 301 accumulates locally and the water flow is poor, the screen elements 102,
As the water level on the front surface of the screen 105 rises, the corresponding float 101 floats further, and the water flow area of the screen element 102 is increased to prevent blockage and secure water flow.

Therefore, the dustproof equipment 100 of the present embodiment
According to the conventional method, the drainage performance of the drainage system does not decrease due to the degree of friction caused by dust, unlike the conventional structure in which dust trapped on the screen is removed by scraping with a scraper, so that high reliability can be maintained. it can.

In the first embodiment, the float 101 is disposed vertically above the rotating disk type screen 122.
However, the present invention is not limited to this. That is, the flow direction position of the rotating disk type screen 122 and the flow direction position of the float 101 may be slightly shifted back and forth. In this case, a similar effect is obtained. In the first embodiment, the four blades 105a are provided on the second screen element 105. However, the number of blades is not limited to four, and may be two to three, or five or more. Therefore, a plurality of sheets are sufficient. In these cases, a similar effect is obtained.

A second embodiment of the present invention will be described with reference to FIGS. The present embodiment is an embodiment in which a gate driven to a predetermined height position by a driving unit is used as a floating member. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. FIG. 7 is a front view showing the entire structure of the dustproof equipment 400 according to the present embodiment, and FIG. 8 is a horizontal sectional view thereof. In FIGS. 7 and 8, the first
The main difference from the dustproof equipment 100 of this embodiment is that, instead of the float 101, the gate 108 driven to a predetermined height position is provided as described above.

That is, the gate 108 is connected to the float 10
As in the case of 1, the surface flow of the muddy water near the branch of the bypass waterway 4 is blocked, and the water stoppage water area 201 is generated on the front surface (upstream side). Each gate 108 is integrally formed with a gate body 108a, which is a hollow structure having an outer frame formed of, for example, a steel plate, and a skirt 108b extending vertically downward from both front and rear surfaces thereof, and further includes a plurality of guide rods. It moves up and down under the guidance of 108c. 9A and 9B are side sectional views showing the detailed structure of the gate 108. FIG. FIG. 9A shows the gate 10.
FIG. 9B corresponds to a state in which the gate 108 is rising, and FIG. Note that in both figures, the inside of the skirt 108b is partially shown in cross section for clarification of the structure.

The gate 108 having such a structure is moved up and down by driving the feed screw 108d attached to the gate body 108a by the gate driving device 109. The operation of the gate driving device 109 at this time is as follows.
It is controlled according to the water level in front of the gate. This will be described in detail below.

That is, as shown in FIG.
A detector 110 such as an electrode type water level detector is installed on the upstream side of 08 to detect the water level. Although not particularly shown in FIGS. 7 to 9, each gate 108 is provided with a displacement detector 113 to detect each displacement. The control panel 112 controls the driving of the gate driving device 109 according to these two detection signals. FIG. 10 is a block diagram showing the contents of the drive control by the control panel 112.

In the control panel 112 shown in FIG. 10, a control target signal from the control target voltage generator 117 corresponding to a preset target gate penetration depth yo and a water level Ho on the upstream side of the gate (first embodiment) The detection signal of the water level detector 110 which represents the
08, that is, the height h ″ (FIG. 5 of the first embodiment)
) Is input to the arithmetic unit 114. Then, in this arithmetic unit 114, y = Ho−h ″ from Ho and h ″.
Is obtained, and a control deviation y-yo is calculated from this and yo.
Is calculated. After the phase of the control deviation y-yo is adjusted by the phase compensation circuit 115, the amplifier 11
6 to the gate driver 109. By such control, the depth of the gate 108 underwater penetration y
Is controlled to the target value yo.

The detector 111 is also provided on the downstream side of the gate, and the water level signal from the detector 111 is different from the water level signal on the upstream side of the gate to obtain the dust-proof equipment 40.
It can be used for monitoring 0 clogging.

According to the dustproof equipment 400 of this embodiment configured as described above, in addition to the same effects as those of the first embodiment, the penetration depth y of the gate 108 is kept constant (= the target value y).
Since it is possible to perform the control in o), it is possible to always secure a still water stagnant water area 201 sufficient to cause the refuse 301 to stay in front of the gate 108.

In the second embodiment, the feedback stationary control is performed by providing the phase compensation circuit 115 in the control panel 112. However, the present invention is not limited to this. That is, various control methods can be considered in addition to the feedback control. For example, so-called PID control can be performed for the purpose of further improving control responsiveness. In this case, a PID control circuit is provided in the portion of the phase compensation circuit 115 in FIG.

Next, another embodiment of the water flow generator will be described. This embodiment is an embodiment of a water flow generating device in the case of not a propeller type. Members equivalent to those of the first and second embodiments are denoted by the same reference numerals. FIG. 11 is a conceptual diagram illustrating a configuration of the water flow generation device according to the present embodiment. In FIG. 11, the water flow generation device 5 according to the present embodiment
07 indicates that the river water taken by the pump 501 from the downstream area (not shown) of the gate 108
When one of the motor valves 403A, B, and C is opened under the control of the control panel 512 based on a signal from the detector 110 representing the water level on the upstream side, the corresponding water supply pipe 502
A jet is ejected from any of A, B, and C, thereby controlling the water flow generation water level. FIG. 12 is a block diagram showing the control contents in the control panel 512.

In the control panel 512 shown in FIG. 12, the detection signal from the water level detector 110 indicating the water level Ho on the upstream side of the gate 108 (see FIG. 5 of the first embodiment) and the respective signals from the voltage generator 520 are shown. Water supply piping 502A, 502B, 5
02C and the voltage signals VA, VB, VC corresponding to the comparator 5
18, the detection signal Ho and the voltage signals VA, VB, VC
Is compared with In this comparison, for example, a voltage signal closest to Ho is selected and output from the comparator 518. The output from the comparator 518 is input to the switch switch 519, and the switch switch 519
Switches the switches of the motor valves 503A to 503C according to the input value. That is, when VA is selected by the comparator 518, the motor valve 518A is opened, the other motor valves 518B and C are closed, and the water supply pipe 502 is closed.
Only A is conducted, and water from the pump 501 is jetted from the highest position. When VB is selected by the comparator 518, the motor valve 518B is opened, the other motor valves 518C and A are closed, only the water supply pipe 502B is made conductive, and water from the pump 501 is ejected from the intermediate position. . When VC is selected by the comparator 518, the motor valve 518C is opened, and the other motor valves 518A, 518A,
B is closed, only the water supply pipe 502C is made conductive,
Water from the pump 501 is jetted from the lowest position.

By controlling the motor valve 503 in accordance with the water level on the front side of the gate 108 by performing such control, a water flow can be effectively generated on the surface layer of the still water retaining water area 201 where the dust 301 easily accumulates. Can be done.

[0045]

According to the present invention, the dust trapped in the floating and sinking member is surely swept downstream from the branch in the main waterway by the water flow generated by the water flow generating means, and the dust is scavenged. It can be performed effectively and reliably. Therefore, for example, if the accumulation site is provided downstream of the branch portion in the main waterway to accumulate dust, the accumulated dust can be pulled up from the waterway at an appropriate time independently of dust prevention. . Accordingly, unlike the conventional structure in which dust trapped on the screen is scooped and removed by a scraper, the drainage performance of the drainage system does not decrease due to the degree of friction caused by dust, and high reliability can be maintained.

[Brief description of the drawings]

FIG. 1 is a front view illustrating the entire structure of a dustproof facility according to a first embodiment of the present invention.

FIG. 2 is a horizontal sectional view of the dustproof equipment shown in FIG.

FIG. 3 is a side sectional view showing a detailed structure of the float shown in FIG.

FIG. 4 is a plan view and a side view showing a detailed structure of a screen element.

FIG. 5: Water level difference x and depth y of the float below the water surface
It is a figure which shows the dimension relationship of etc.

FIG. 6 is a diagram illustrating an example of a relationship between a water depth Ho and a plunge depth y.

FIG. 7 is a front view illustrating an entire structure of a dustproof facility according to a second embodiment of the present invention.

FIG. 8 is a horizontal sectional view of the dustproof equipment shown in FIG.

9 is a side sectional view illustrating a detailed structure of a gate illustrated in FIG.

FIG. 10 is a block diagram showing the contents of drive control by the control panel shown in FIG.

FIG. 11 is a conceptual diagram illustrating a configuration of another embodiment of the water flow generation device.

FIG. 12 is a block diagram showing the contents of drive control by the control panel shown in FIG.

FIG. 13 is a layout plan view of a general drainage system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 River (main waterway) 2 Major river 3 Main waterway gate 4 Detour waterway 4A Detour waterway 4a Center pier 5 Drainage station 6 Detour waterway gate 100 Dustproof equipment 101 Float (floating member) 101a Float body 101b Skirt 101c Guide rod 101d Stopper 102 Screen element 102a rotating cylinder 102b rotating disk 102c rotating shaft 102d slit 103 drive motor 104 timing belt 105 screen element 105a blade 105b rotating disk 105c rotating shaft 106 drive motor 107 water flow generator (propeller type water flow machine) 107a water flow generator float 107b protective cover 107c Propeller 108 Gate (floating member) 108a Gate body 108b Skirt 108c Guide rod 108d Feed screw 109 Gate driving device ( Moving means) 110 water level detector 111 water level detector 112 control panel (control means) 122 rotating disk type screen 201 still water retaining area 202 kamaba 203 net 204 water flow in the float width direction 205 flow from river to float 301 dust refuse 400 dustproof Equipment 501 Pump 502A-C Water supply piping 503A-C Motor valve 507 Water flow generator 512 Control panel

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshihiko Yoshikawa, Inventor 603, Kandamachi, Tsuchiura-shi, Ibaraki Pref.

Claims (10)

[Claims] 1. A main waterway gate provided downstream of a main waterway, a bypass waterway branched from the main waterway and provided with a drainage pump, and a bypass waterway gate provided downstream of the main waterway. A dustproof system for a drainage system installed in a drainage system provided with a screen disposed near a branch where the bypass channel branches off from the main channel, and preventing inflow of dust from the main channel into the bypass channel. , A floating member provided to be able to float up and down in a water surface position in the vicinity of the screen, damming a surface flow near the branch portion to form a stagnation portion on an upstream side, and in the width direction of the floating member in the stagnation portion. Dust prevention equipment for a drainage system, comprising: a water flow generating means for generating a water flow. 2. The dustproof equipment for a drainage system according to claim 1, wherein a plurality of said floating and sinking members are arranged so as to divide the entire width of said bypass waterway. 3. The dustproof equipment for a drainage system according to claim 1, wherein said floating member is a float that floats following a change in water level. 4. The dustproof equipment for a drainage system according to claim 1, wherein said floating member is a gate driven to a predetermined height position by a drive means. 5. The dustproof equipment of a drainage system according to claim 4, wherein the floating member has a lower end substantially at the same height position as the upper end of the screen when a water level is relatively high, When the water level is relatively low,
Dust prevention equipment for a drainage system, wherein a lower end of the floating member is lower than an upper end of the screen so that at least a part of the floating member covers the screen. 6. The dustproof equipment for a drainage system according to claim 1, wherein the screen includes a plurality of screen elements arranged in a width direction of the bypass water channel, and each screen element is substantially parallel to a water surface. Dustproof equipment for a drainage system, wherein rotating disk-shaped members are attached at predetermined intervals at a plurality of positions in a vertical direction. 7. The dustproof equipment for a drainage system according to claim 6, wherein at least one of the plurality of screen elements is radially attached from a vertical axis that is a rotation center of the rotating disk-shaped member. Dust prevention equipment for a drainage system, wherein a plurality of blades functioning as a centrifugal pump are provided around a vertical axis. 8. The dustproof equipment for a drainage system according to claim 6, wherein at least one of the plurality of screen elements includes a rotating cylindrical member having the same rotation center as the rotating disk-shaped member, and The dustproof equipment for a drainage system, wherein the plurality of rotating disk-shaped members are fixed to a plurality of vertical positions on an outer peripheral surface of the rotating cylindrical member. 9. The dustproof equipment for a drainage system according to claim 8, wherein a slit is formed on an outer peripheral surface of said rotary cylindrical member. 10. The dustproof equipment for a drainage system according to claim 1, wherein said water flow generating device is a propeller type water current machine.