JP3504090B2 - Dust removal system for drainage system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is installed in a drainage system comprising a main waterway gate provided at a downstream portion of a main waterway and a bypass waterway branching from the main waterway and provided with a drainage pump and a bypass waterway gate. The present invention relates to dust removal equipment for a drainage system provided with a dustproof screen for preventing dust from flowing into a pump water absorption tank of the drainage pump.

[0002]

2. Description of the Related Art Conventionally, a flood of a river or a waterway (in this specification, referred to as a "main waterway") that merges with a large river (including a large waterway or the ocean; hereinafter the same) during a typhoon or other heavy rainfall. In order to prevent flood damage in the basin of the main canal, a drainage system using a bypass canal as shown in Fig. 1 has been put into practical use. This drainage system
The main waterway gate 3 is provided at the communication part between the main waterway 1 and the large river 2, and the bypass waterway 4 is formed on the upstream side of the main waterway gate 3, and the drainage pump station 5 equipped with a drainage pump is provided in the middle of the bypass waterway 4 to the drainage pump station 5 A pump water absorption tank is provided on the upstream side, and a bypass waterway gate 6 is provided at a communication portion between the bypass waterway 4 on the downstream side of the drainage pump station 5 and the large river 2. Then, at the time of typhoon or other heavy rainfall, the main waterway gate 3 is closed and the bypass waterway gate 6 is opened, and the water in the main waterway 1 is passed through the bypass waterway 4 by the drainage pump installed in the drainage pump station 5. It is drained to 2 to prevent flood damage in the basin of main canal 1.

Also, in this drainage system, it is prevented that the dust floating in the main waterway 1 and flowing down flows into the pump water absorption tank from the bypass waterway 4 and damages or blocks the drainage pump to make it impossible to perform drainage operation. In order to do so, the dust removing equipment 10 provided with a dust-proof screen such as a bar screen for capturing dust is installed near the branch portion where the bypass water passage 4 branches from the main water passage 1 and the inflow portion of the pump water absorption tank. . By the way, the mesh width of the dustproof screen of the dust removal equipment 10 is set so that the dust that has passed through the screen does not block the impeller of the drainage pump or bite into the slit portion of the drainage pump. Then, the dust trapped on the dust-proof screen of the dust-proof facility 10 is normally removed by a dust remover (for example, “Sewerage Course 3-Pump Station Design and Concept” edited by the Sewerage Design Data Study Group (April 5, 1979). Kashima Publishing Co., Ltd., 3rd edition, p.96).

In this dust remover, an endless chain having a number of scrapers runs on a screen provided on the water surface in a substantially vertical direction to scrape and remove dust collected on the front surface of the screen by the scraper. Is. That is, when the endless chain runs and the scraper reverses near the upper end of the screen, the dust falls from the scraper onto the belt conveyor installed below the position where the scraper is inverted, and the dust is placed on the belt conveyor and is conveyed to the hopper. It is sent, accumulated, and taken out from the drainage pump station as industrial waste and disposed of.

[0005]

By the way, in the above conventional drainage system, the dust trapped on the dustproof screen is pressed against the dustproof screen by the pressure of the flowing water flowing down the bypass water passage 4. In order to scrape and remove dust collected by the dustproof screen with a scraper, it is necessary to scrape against the frictional force due to the pressing force, and the force may reach several tons or more. In addition to the pressing force of running water, this frictional force depends on the coefficient of friction between the dust and the dust-proof screen, but dust is usually found in driftwood, water muddy, plastics, etc.
It has a wide variety of shapes and in some cases the coefficient of friction can be very large. Therefore, when the coefficient of friction between the dust and the dustproof screen is very large, the frictional force becomes extremely large and the drive motor of the endless chain with the scraper overloads and trips, maintaining good dust removal performance. May be difficult to do. When the performance of the dust remover deteriorates, dust particles accumulate on the dust-proof screen and impede water flow, which reduces the amount of water flowing through the bypass water channel, making it difficult to maintain the desired drainage performance of the drainage system. There was a problem of becoming. Also, when the dust scraped up by the scraper falls on the belt conveyor, depending on the shape and material of the dust, it may bounce on the conveyor and fall from the conveyor, or the conveyor may be caught by the guide of the conveyor while being conveyed by the conveyor. There is a risk that it will not be able to be transported. Particularly, coarse dust such as home electric appliances is likely to be in such a state. Further, in the popper that stores the dust transported by the conveyor, the dust may be entangled with each other to form a large mass, and the dust may be caught by a guide or the like and may not drop, and the hopper may overflow. Then, in such a case, the dust remover and the transfer conveyor must be stopped. In this way, each process is interrelated, especially when a failure occurs in the process up to the hopper after scooping, the function as dust removing equipment is impaired,
It is difficult to maintain the desired drainage performance of the drainage system, and it is impossible to prevent flood damage in the basin of the main canal.

In view of the problems of the above conventional drainage system, particularly the dust removal equipment of the drainage system, the present invention ensures a reliable reduction in the drainage performance of the drainage system with a simplified structure. It is an object of the present invention to provide dust removal equipment for a drainage system that can be prevented.

[0007]

In order to achieve the above object, the dust removing equipment of the drainage system of the present invention comprises a main waterway gate provided at a downstream portion of the main waterway, a branch from the main waterway, a drainage pump and a bypass. In the dust removal equipment of the drainage system, which is installed in the drainage system consisting of the detour waterway provided with the waterway gate and which is provided with the dustproof screen for preventing the inflow of dust to the pump water absorption tank of the drainage pump, the upstream side of the dustproof screen Wastewater storage channel (Kamaba) that connects the downstream side and the downstream side
And a dust outflow prevention screen is installed in the vicinity of the communication portion between the downstream side of the dust storage water channel and the bypass water channel.

In the dust removal equipment of the drainage system of the present invention, when the typhoon or other heavy rainfall occurs, the main waterway gate is closed and the bypass waterway gate is opened, and the water in the main waterway is drained by the drainage pump to the large river. Drain water to prevent flood damage in the basin of the main canal. At this time, dust such as driftwood, water mica, plastics, etc. that flowed from the main canal to the bypass canal is prevented from flowing into the pump water absorption tank by the dustproof screen, and flows into the dust storage canal communicating with the bypass canal, and the dust is stored. By being caught by the dust outflow prevention screen installed near the communication part between the downstream side of the waterway and the bypass waterway,
It is stored in the dust storage channel.

In this case, the dustproof screen is
It is possible to provide a dust moving function for causing the dust captured by the dustproof screen to flow toward the dust storage water channel. As a result, the dust that has been prevented from flowing into the pump water absorption tank by the dustproof screen can smoothly flow into the dust storage water channel that communicates with the bypass water channel, and dust can be accumulated on the dust screen and flow through the bypass channel. It is possible to prevent the amount of water from decreasing.

Further, the dust outflow prevention screen can be movably installed in the vicinity of the communication portion between the upstream side of the dust storage water channel and the bypass water channel. As a result, when the water level in the bypass waterway decreases, the upstream part of the wastewater outflow prevention screen can close the communication part between the upstream side of the wastewater storage waterway and the bypass waterway, and the wastewater stored in the wastewater storage waterway can be removed. It is possible to prevent backflow into the bypass waterway.

Further, it is possible to form the bottom surface level of the refuse storage water channel higher than the bottom surface level of the bypass water channel. As a result, when the water level of the bypass waterway drops and returns to the normal water level, the bottom of the dust storage waterway appears, making it possible to enter a self-propelled carrier such as a wheel loader or excavator into the dust water storage waterway. In addition to facilitating the work of carrying out dust, it also eliminates the need for fixed equipment on the ground such as a conveyor and a hopper.

Further, it is possible to install a dust carrying-out mechanism for pulling up and carrying out the dust in the dust storing water channel from above the dust storing water channel. As a result, the dust can be directly pulled out from the dust storage water channel and carried out.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the dust removing equipment of a drainage system of the present invention will be described below with reference to the drawings.

2 to 3 show a first embodiment of the dust removing equipment of the drainage system of the present invention. 2 is a plan view showing the entire structure, and FIG. 3 is a sectional view thereof. The dust removing equipment of this drainage system is applied to the same drainage system as the conventional one shown in FIG. 1, and the bypass water channel 4 is opened and cut at a predetermined position of the main water channel 1, and the communication between the main water channel 1 and the bypass water channel 4 is performed. The dust removing equipment 10 is installed in the section. The dust removing equipment 10 is mainly provided with a dustproof screen 11 that is provided at the entrance of the bypass water channel 4, that is, in the vicinity of a branch from the main water channel 1 and that can move dust in the width direction of the bypass water channel 4. The dustproof screen 11 is composed of a plurality of floats 11a provided so as to be able to float up and down, and a plurality of horizontal plate screens 12 located below the floats 11a on the upstream side. The dustproof screen 11 is provided on the upstream side with a water flow generation device 13 for moving the dust trapped by the dustproof screen 11 in the width direction of the bypass water passage 4.

Of these, the float 11a is the detour waterway 4
This float 11 serves to block the surface flow of the water and form a still water retention area 20 on the front surface (upstream side).
a is provided with a plurality of guide rollers 11b so as to be vertically movable at both ends of a float main body which is a hollow structure having an outer frame formed of a steel plate or the like, and is formed by guide rails 11c formed on both sides of the bypass water channel 4. The float 11a moves up and down along the guide rail 11c so as to support the guide roller 11b and can follow the change in water level. Stoppers are provided above and below the guide rails 11c so that the float 11a does not rise too much when the water level is high and a gap is not formed between the upper end of the horizontal plate screen 12 and the lower end of the float 11a. When the water level is low, the float 11a does not drop too much to completely close the detour waterway 4. Further, the horizontal plate screen 12 is located in the still water retaining water region 20, and in order to capture the dust 30 in the submerged water flow of the float 11a, the float 11 is
It is arranged at the front (upstream side) of the a in the lower channel width, and is composed of a plurality of plates that are parallel to each other in the vertical direction. Each plate of the horizontal plate screen 12 is entangled with string-like and thread-like dust. The plate width is formed to have a width of several hundred mm or more in the water flow direction so as to be difficult.

The water flow generator 13 is disposed on one side surface portion of the bypass water passage 4, and rotates a propeller 13c provided in the protective cover 13b to provide a water flow generator screen 13e from the bypass water passage 4. It is a so-called propeller-type water flow machine that causes water to flow in through 13d and generates a water flow in the width direction of the float 11a (width direction of the bypass water passage 4) in the still water retaining water area 20. Then, in order to respond to the water level change of the main waterway 1 and always effectively generate a water flow in the surface layer portion of the still water retaining water region 20, a float 13a for a water flow generator was attached to the upper part of the protective cover 13b and floated on the water surface. It is composed. In this embodiment, the water flow generator 13 is a unit in which a plurality of (four) propellers are arranged, but the configuration is not limited to that of this embodiment.

As shown in FIG. 2, a plurality of bypass water passages 4 are generally provided by a center pier 4a disposed downstream of the dustproof screen 11 (three in this embodiment).
It is divided into the detour waterway 4. Therefore, in the dustproof equipment 10 of the present embodiment, the float 11 is provided for convenience of construction.
The horizontal plate screen 12a and the horizontal plate screen 12 are divided into a plurality of parts according to the size between the center piers 4a, and these are installed in each of the divided bypass channels. That is, each unit is arranged so as to divide the entire width of each divided bypass water channel 4 into approximately three.
It is provided with one float 11a and three horizontal plate screens 12.

Further, in this embodiment, the dustproof screen 11 is used.
The water flow generation device 13 is arranged on the side of the bypass water channel in order to cause the dust trapped in the direction of the dust storage water channel side in the width direction of the bypass water channel along the upstream side surface of the dust prevention screen 11. Water flow generator 13 and dustproof screen 11
Instead of the horizontal plate screen 12 of FIG. 4, a multi-rotating disk type screen 50 as shown in FIGS. 4 to 5 can be used. The multi-rotating disc type screen 50 has a large number of discs 51, 51 ... Having a required diameter and thickness ... Discs 51 and 5 that are adjacent to each other and are located above and below
The other disc 51 adjacent to the gap of 1 is inserted and arranged so as to mesh with each other, and each disc 51, 51 ...
A drive device 53 is provided so as to rotate in the same direction. Then, by driving this whole disk so that the dust 30 moves in the same direction and in the width direction of the bypass water channel 4 on the upstream side of the multiple rotation disk type screen 50, the same effect as the water flow generating device 13 can be obtained. Is.
In this case, the dustproof screen 1 of the first embodiment described above.
It is desirable that the float 11a of No. 1 is installed side by side.

At the downstream position of the water flow generator 13 in the water flow direction, a dust storage water passage 40 is formed so as to communicate with the bypass water passage 4 on the upstream and downstream sides of the screen. Dust storage water channel 40
Volume is sufficient to store the amount of dust that is expected to flow down during a typhoon or other heavy rainfall, and a relatively coarse dust outflow to the communication part of the bypass waterway 4 downstream of the dust storage waterway 40. The prevention screen 41 is arranged to prevent the dust stored in the dust storage water channel 40 from re-flowing to the bypass water channel 4 side. In addition, the dust outflow prevention screen 41 has a sufficient water passage area so as not to be blocked by the captured dust. The dust outflow prevention screen 41 may have various structures such as a bar screen and a net screen, as long as the above conditions are satisfied.

In addition, the bypass water passage 4 is provided with a pump water absorption tank 8 and a drainage station 5 equipped with a pump, preferably the bypass water passage 4
A bypass water channel gate 6 is provided in the communication portion between the bypass water channel 4 and the large river 2.

Next, the operation of removing dust from the dust removing equipment 10 of this embodiment will be described. In a general drainage system provided with the dust removing equipment 10, for example, when a typhoon or other heavy rainfall occurs, the main waterway gate 3 on the downstream side of the main waterway 1 is closed, and the detour waterway 4 on the downstream side is bypassed. The waterway gate 6 is opened and the water in the main waterway 1 is pumped into the water absorption tank 8
The drainage pump of the drainage pump station 5 absorbs water and discharges the water in the detour waterway 4 to the side of the large river 2 to prevent flood damage in the basin of the main waterway 1. At this time, dust particles such as driftwood, water mica, and plastic flow down in the main water channel 1, but since these generally have a specific gravity smaller than that of water, they flow down as dust particles 30 due to buoyancy. And, together with the water, the detour waterway 4
At the branch portion of the above, it flows from the main waterway 1 into the detour waterway 4.
The horizontal surface screen 12 of the dustproof screen 11 of the dustproof facility 10 installed at the branch portion from the main waterway 1 to the bypass waterway 4 and the float 11a above the downstream side thereof block the surface layer flow. This makes the float 11
A still water storage area 20 is formed on the front surface (upstream side) of a.

When the float 11a stops the flow, a water level difference is generated before and after the float 11a. As shown in FIG. 6, this water level difference: x is uniquely determined by the underwater plunge depth of the float: y (see, for example, Honma et al., “Hydraulics”, Iwanami Shoten p. 199). It is given by the relation of formula.

[0023]

[Formula 1] Here, Ho = water level upstream of the weir Q = flow rate μ = outflow coefficient (= 0.6) b = water channel width g = gravitational acceleration.

A concrete example of this relationship is shown in FIG. FIG. 7 shows the channel width: b = 7 m, the flow rate: Q = 17.5.
In the case of m ³ / s (flow velocity = 0.5 m / s), the water depths of the water channels: Ho = 5 m and Ho = 3 m are shown respectively. As is clear from FIG. 7, the water level difference x before and after the float 11a increases as the plunge depth y of the float 11a increases.
However, if the plunge depth y is too large,
The water level Ho upstream of the float 11a rises, which is not preferable. If you keep the water level difference within 0.2m, float 11a
Depth y is y = 2.8 m when the water depth of the waterway: Ho = 5 m, y = when the water depth of the waterway: Ho = 3 m
It will be about 1.7 m.

In this case, according to a well-known flow analysis, the still water retaining area 20 near the front water surface of the float 11a.
It is known that the range: L is approximately proportional to the plunge depth (y) of the float 11a. For example, according to the above calculation example, the water depth of the channel: Ho = 5 m, y = 2.8.
In case of m, L = about 3.0 m, water depth of channel: Ho = 3
When m and y = 1.7 m, L = 2.0 m or so. If a water level difference occurs on the front and rear surfaces of the float 11a, a water pressure corresponding to the water level difference acts on the float 11a, so the float 11a, the guide roller 11b, and the guide rail 1 are provided.
1c is designed in advance so as to have a strength capable of withstanding this water pressure.

By thus forming the still water retaining water area 20 on the upstream side of the float 11a, most of the dust 30 is retained in the still water retaining water area 20. Then, the water flow generator 13 generates a water flow 14 in the still water retaining water region 20 in the width direction of the float 11 a (width direction of the bypass water passage 4). At this time, the water flow 14 generated by the water flow generator 13 always receives the force of the flow 15 flowing down from the main waterway 1 toward the float 11a at the boundary of the still water retention water region 20 as it advances. Since the flow 15 itself dives downward from the boundary of the still water retention water region 20, the water flow 14 generated by the water flow generation device 13 does not diffuse and loses momentum even when it is far from the water flow generation device 13. That is, the water flow generation device 13 includes the float 11a.
It is possible to effectively create a water flow toward the dust storage water channel 40 along the line. Therefore, this float 11a
The dust 30 trapped in the dust flows on the water flow generated by the water flow generator 13, and is reliably pushed to the dust storage water passage 40 downstream of the branch portion in the main water passage 1 and removed from the front surface of the float 11a. The movement of 30 can be performed effectively and reliably. When the multi-rotating disc type screen 50 is installed, the disc 51 of the multi-rotating disc type screen 50 is rotated in the same direction so that a water flow is generated by driving the water flow generator 13. , Dust 30 is almost independent of the water level, Dust storage channel 4
It can be transferred to the 0 side.

It should be noted that some of the dust particles 30 having a relatively large specific gravity
Goes under the still water retaining area 20 on the front surface of the float 11a, and the dust larger than the mesh width of the horizontal plate screen 12 is captured by the horizontal plate screen 12. In this case, even if string-like or thread-like dust is entangled and grows large, the horizontal plate screen 12 is formed to have a large dimension in the flow direction of several hundred mm, so that the horizontal plate screen 12 is not blocked by dust. .

After that, when the water level drops, the float 11a is also pushed down, and the horizontal plate screen 12
Is blocked from the top. In this state, the dust trapped on the horizontal plate screen 12 is released from the hydraulic resistance acting on the horizontal plate screen 12, so that it is easy to separate, and the water flow 14 by the water flow generator 13 with a float descending together with the float 11a causes It separates from the horizontal plate screen 12 and moves in the width direction of the bypass water channel 4. This dust removal is performed in order from the upper part to the lower part of the horizontal plate screen 12 as the water level is lowered, and when the water level is completely lowered, the entire surface of the horizontal plate screen 12 is cleaned.

As described above, since all the dust particles 30 floating and flowing down the surface layer and the bottom layer move to the downstream side of the water flow generator 13, they can be accumulated in the dust accumulation water channel 40 provided on the downstream side. , Temporarily stored here.

Here, the dust storage water channel 40 and the float 11
Since the detour waterway 4 on the downstream side of “a” is in communication and a strong downstream water flow is created in the dust storage water passage 40 by the operation of the drainage pump, the dust waste 30 does not dissipate and Accumulated in.

At the same time, the dust 30 can be sent deep into the dust storing water channel 40, and the space of the dust storing water channel 30 can be effectively used. Further, the power of the water flow generator 13 is sufficient only by moving the dust 30 from the bypass water channel 4 to the entrance of the dust storage water channel 40, and further energy saving is achieved.

By disposing the crane equipment 7 with a bucket above the dust storage water channel 40 so as to be movable in the front-rear, left-right and up-down directions, the waste water is stored after the drainage operation is completed and the pump is stopped. The dust 30 can be directly pulled up from the dust storage water channel 40, transferred to a transportation means such as a truck, and carried out from the drainage station 5.

Further, preferably, when the bottom level 40B of the dust storage water channel 40 is made higher than the bottom level 4B of the bypass water channel 4 and the water level 40B is constructed at a level where the water bottom 40B appears on the ground surface, the water level returns to the normal level. At this time, a wheel loader, a shovel, or the like can be inserted into the bottom of the dust storage water channel to easily collect the dust. Therefore, the step of pulling dust from the water surface and moving the ground to the hopper by the conveyor, which is required in the conventional equipment, can be omitted, so that the equipment can be simplified.

Further, preferably, a net-like dust backflow prevention screen 42 that can be opened and closed is provided at the entrance of the dust storage waterway 40, so that the dust backflow prevention screen 42 can be used by the dust backflow prevention screen 42 at the end of the drainage operation. It is possible to prevent the dust 30 in the dust storage water channel 40 from flowing back to the bypass water channel 4 by closing the inlet part of the. The opening / closing operation of the dust backflow prevention screen 42 can be performed by an electric winch or the like.

Therefore, according to this dust removing equipment 10,
Unlike conventional dust removal equipment, it is not necessary to scrape dust trapped on the screen with a scraper and convey it with a conveyor, and accumulate it in a hopper, which allows various dust removal methods that conventional dust removal equipment has. Not only can you solve the problem,
It is possible to provide a simplified dust removal facility that does not require human labor.

Next, FIGS. 8 to 9 show a second embodiment of the dust removing equipment of the drainage system of the present invention. FIG. 8 is a plan view showing the entire structure, and FIG. 9 is a sectional view thereof. In this embodiment, the horizontal plate screen 12 of the dustproof screen 11 of the dust removing equipment 10 for transferring the dust 30 in the width direction of the water channel is formed in the bypass water channel 4 by the drainage pump water absorption tank 8.
And the dust storage water channel 40 formed along the bypass water channel 4 are partitioned and arranged in parallel in the pump water absorption tank 8, and the dust removal equipment of the drainage system of the first embodiment described above. Although different, the other basic configurations and operational effects are exactly the same as those of the first embodiment.

Also in this embodiment, the water flow generator 13 and the horizontal plate screen 12 of the dustproof screen 11 may be replaced by a multi-rotating disc type screen 50 as shown in FIGS. Further, the shape of the dust storage water channel 40 is not limited to the rectangular shape as in the present embodiment, but may be an arbitrary shape according to the site conditions.

[0038]

According to the dust removal equipment of the drainage system of the present invention, when the typhoon or other heavy rainfall occurs, the main waterway gate is closed and the bypass waterway gate is opened so that the water in the main waterway can be drained by the drainage pump. The water can be drained to a large river through the water and the damage to the main canal can be prevented. And, in particular, driftwood, water mister, which flowed from the main canal to the detour canal,
Dust such as plastics is prevented from flowing into the pump water absorption tank by the dust-proof screen, flows into the waste storage channel communicating with the bypass water channel, and is installed in the downstream side of the dust storage channel and near the communication section of the bypass channel. By being captured by the outflow prevention screen and stored in the dust storage water channel, it is possible to reliably and reliably prevent the deterioration of the drainage performance of the drainage system with a simple structure. .

Further, since the dustproof screen is provided with a dust moving function for causing the dust trapped by the dustproof screen to flow toward the dust storage channel, the dustproof screen prevents the dust from flowing into the pump water absorption tank. To
It is possible to smoothly flow into the dust storage water channel communicating with the bypass water channel, and it is possible to more reliably prevent dust from being accumulated on the dust prevention screen and reducing the amount of water flowing through the bypass water channel.

Further, by movably installing the dust backflow prevention screen near the communication part between the upstream side of the refuse storage waterway and the detour waterway, the dust backflow prevention screen is provided when the water level of the detour waterway drops. Thus, the communication part between the upstream side of the refuse storage water channel and the bypass water channel can be closed, and the dust stored in the refuse storage water channel can be prevented from flowing back to the bypass water channel.

Further, by forming the bottom level of the dust storage water channel higher than the bottom level of the bypass water channel, the water level of the bypass water channel lowers, and when the water level returns to the normal water level, the bottom surface of the dust storage water channel appears. A self-propelled vehicle such as a wheel loader or shovel car can be loaded into the dust storage waterway, facilitating the work of unloading dust, and eliminating the need for ground fixing equipment such as a conveyor and hopper.

Further, by installing a dust carrying-out mechanism for pulling up and carrying out dust in the refuse storing water channel from above the dust storing water channel, the dust can be directly pulled up and carried out from the dust storing water channel.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a drainage system.

FIG. 2 is a plan view showing a first embodiment of the dust removing equipment of the drainage system of the present invention.

FIG. 3 is a sectional view of the same.

FIG. 4 is a plan view showing a modification of the first embodiment of the dust removing equipment for the drainage system of the present invention.

FIG. 5 is an explanatory diagram of a multi-turn disc type screen.

FIG. 6 is an explanatory diagram showing the relationship between the water level difference and the plunge depth of the float below the water surface.

FIG. 7 is a graph showing the relationship between the water level difference and the depth of the float below the water surface.

FIG. 8 is a plan view showing a second embodiment of the dust removing equipment of the drainage system of the present invention.

FIG. 9 is a sectional view of the same.

[Explanation of symbols]

1 main waterway 2 major rivers 3 Main waterway gate 4 detour waterway 4B Bottom level of bypass waterway 5 Drainage station 6 Detour waterway gate 7 Crane equipment with bucket 8 pump water absorption tank 10 Dust removal equipment 11 Dustproof screen 11a float 12 Horizontal plate screen 13 Water flow generator 20 still water retention area 30 dust 40 Dust storage waterway (Kamaba) 40B Bottom level of dust storage waterway 41 Dust outflow prevention screen 42 Dust backflow prevention screen 50 multi-turn disc screen

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshihiko Yoshikawa 603 Kandamachi, Tsuchiura-shi, Ibaraki Hitachi Tsuchiura Plant, Inc. (72) Inventor Shiro Matsui 603 Jinmachi, Tsuchiura-shi, Ibaraki Hitachi Tsuchiura Plant, Ltd. (72) Inventor, Hitoshi Hatano, 3-11-1, Shimosaka, Amagasaki, Hyogo Prefecture, Nitate Kiden Kogyo Co., Ltd. (72) Inventor, Tetsuo Yamagata, 3-11-1, Shimosaka, Amagasaki, Hyogo Incorporated (72) Inventor Eiichi Muto 3-11-1, Shimosakabe, Amagasaki City, Hyogo Nitto Kiden Kogyo Co., Ltd. (56) Reference JP-A-3-66813 (JP, A) JP-A-9- 217332 (JP, A) JP, 10-8441 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E02B 5/08 101-104 E02B 5/00

Claims (5)

(57) [Claims] 1. A pump of the drainage pump installed in a drainage system comprising a main waterway gate provided in a downstream portion of the main waterway and a drainage waterway provided with a drainage pump and a bypass waterway gate branching from the main waterway. In a dust removal equipment of a drainage system provided with a dustproof screen for preventing the inflow of dust to the water absorption tank, a dust storage water passage communicating between the upstream side and the downstream side of the dustproof screen is formed, and the dust storage water channel is downstream. Dust removal equipment for a drainage system, characterized in that a dust outflow prevention screen is installed near the communication part between the side and the bypass waterway. 2. The dust-proof screen has a dust-dispersing function for allowing dust collected by the dust-screen to flow toward the dust storage channel.
Or the dust removal equipment of the drainage system according to 2. 3. The dust removal equipment for a drainage system according to claim 1, 2 or 3, characterized in that a dust backflow prevention screen is movably installed in the vicinity of a communication portion between the upstream side of the dust storage waterway and the bypass waterway. . 4. The bottom level of the refuse storage water channel is formed higher than the bottom level of the bypass water channel.
Dust removal equipment for the listed drainage system. 5. The dust removing equipment for a drainage system according to claim 1, wherein a dust carrying-out mechanism for pulling up and carrying out dust in the refuse storing waterway from above the dust storing waterway is installed.