JP2000121000A - Equipment to collect and transfer sediment in sedimentation tank in underwater channel having cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To collect, transfer, or recover and remove sediment in a channel, a sedimentation tank, etc. SOLUTION: An underwater channel 2 having an openable flap 4 is disposed at the inner bottom of a sedimentation tank 1. During release of the flap 4, sediment is settled in the underwater channel 2. When a specified amount is deposited, jet water equipment, such as a pressure water nozzle, axial flow pump, and an underwater pump, arranged at the starting end o the underwater channel is worked. By injecting jet water in the underwater channel 2, the flap 4 is pushed up and bridged, in order, at subsequent flaps 4 and the upper side of the underwater channel is closed. A given velocity of flow is provided in the underwater channel 2, collection is effected through a flow feed or collection and transport to the outside of the tank are executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sedimentation tank in a drainage channel or a water treatment facility, which is a facility for transferring and collecting or collecting and removing mud deposited and deposited on the inner bottom of the tank in a certain direction.

[0002]

2. Description of the Related Art Conventionally, in order to accumulate sediment in a sedimentation tank, a mechanical scraping method such as a screw, a special chain, or a scraper is often used. In recent years, there has been a case where a facility has been implemented to accumulate sedimentation by injecting pressurized water into a sand basin at a rainwater drainage station.

[0003]

The sedimentation tank in water treatment equipment should be kept as quiet as possible to promote the sedimentation of the contaminants. Although various complicated machinery and equipment are installed in the sedimentation tank to transfer and accumulate sediments, not only does the rest in the tank be impaired, but also the Putting into operation causes many problems such as corrosion, wear, damage, etc., making it difficult to work in sewage,
And unsanitary.

[0004] The transfer and accumulation of sediment by water jetting is not desired because it is not necessary to install complicated mechanical equipment in the water and it is desired, but the rest in the tank cannot be maintained due to the diffusion of the jet water. A deeper settling tank was required and could not be used at all for settling tanks handling small particles.

[0005]

According to the present invention, in order to solve the above-mentioned problems, for example, a U-shaped underwater waterway is opened at the inner bottom of a V-shaped sedimentation basin of a sewerage system, and the upper side opening of the underwater waterway is opened. The flaps perpendicular to the section are arranged in a freely oscillating hanging arrangement, and when a certain amount of mud that has settled in the underwater channel at the time of opening, a pressure water nozzle, an axial flow pump, an underwater By operating jet water equipment such as a pump and injecting jet water into the underwater channel, the flaps are pushed up and sequentially bridged to the next-stage flap,
The upper side of the submerged water channel is closed to form a pipe, and the sedimentary mud is transported in a pipe-transported state, opened near a mud collecting depression where a mud pump is installed, and transported to the next-stage facility by the mud pump.

A flap hanging above an underwater channel needs to be made of a material resistant to abrasion and corrosion, and at the same time, needs to be lightened in order to facilitate rotation by a water force. By attaching a buoyancy material and adjusting the weight to the underwater weight range where it does not float, it can respond to the low flow velocity in the underwater channel.

Further, in the case of a sedimentation tank handling fine particles or a wide sedimentation tank, one to many concave underwater water channels are opened to the required length on the bottom of the water tank, and each of the upper openings of the underwater water channels is intentionally opened and closed. A lid is formed so as to open upward or diagonally upward, and a jet water facility is provided at the beginning of the underwater channel, and the amount of sedimentation of the underwater channel that sediments and deposits when the lid is opened is constant. When the amount reaches the volume, the lid is closed and the post-spout water facility is operated to feed the sediment of the underwater water channel formed into a pipe shape, and is opened to the mud collecting depression where the mud suction pump is installed.

When the sediment in the submerged water channel is transported in the pipeline transportation state, the pump of the jet water equipment may have a low head corresponding to the pipe resistance of the submerged water channel. The sediment can be flowed by installing the pump near the underwater channel and connecting the discharge pipe of the pump that uses the water in the tank directly to the beginning of the underwater channel.

In addition, the starting point of the underwater channel provided with a lid which is opened and closed artificially is opened, and the suction port of the mud pump is connected directly to the terminal at the end, so that the sediment in the underwater channel accumulated while the lid is opened. After the lid is closed, the mud pump is operated and sucked, so that the suction pipe of the mud suction pump can be directly discharged to the outside of the tank in a state of being transported in an extended pipeline.

[0010]

In the sedimentation tank having the underwater water channel at the inner bottom portion as described above, when the flap provided in the underwater water channel is in a hanging state or the lid is opened upward, all the sediment is directly or indirectly. It slides down the side slope wall and accumulates in the water channel. In a submerged waterway with flaps that hang down, when the lower end of the flaps is not buried, by operating the jet water equipment provided at the start end, the flaps arranged in that water force are pushed up sequentially, and the flaps at the next stage The submerged water channel becomes pipe-shaped, flows down without mixing and diffusion, and gradually deposits in the submerged water channel, discharges and accumulates in the mud collecting pit, and is collected by a mud pump. Discharge outside.

[0011] In an underwater channel provided with a lid that can be opened and closed artificially, the properties of the sediment (size of particles, specific gravity, size of adhesiveness, etc.) are determined within a range that does not hinder the opening and closing of the lid. When the amount of sediment reached is reached, the lid is closed and the underwater channel is made into a pipe shape, and then the jet water equipment is operated to transport the sediment in the underwater channel, so the initial operation like a flap type There is no winding phenomenon on the upper surface of the underwater water channel, and small particles can be reliably sent.

However, in the above-described method of once discharging the sediment in the underwater channel to the vicinity of the mud pump, although the diffusion at the outlet is inevitable, the terminal outlet of the underwater channel is located at the inflow side of the settling tank. The diffused particles can be re-sedimented by opening the opening and reversing the sedimentation tank.

Conventionally, when transferring and removing sediment by using pressurized water, it has been common to use high-pressure water. However, the injection of pressurized water in water has a large diffusion and disappearance to the surroundings. Effectively, only a small portion of the surface of the sediment was in contact and very inefficient.

When the underwater channel of the present invention is covered with a lid to form a pipe and the sediment is transported and removed, it is sufficient to secure a flow velocity in the underwater channel according to the hydraulic transport. By the way, the resistance head of the submersible water channel is small, so it is possible to connect the piping of the axial flow pump using water in the tank and the discharge port of the submersible pump directly to the start of the submersible water channel, eliminating the need for an installation location outside the tank and pressure water piping And can be made more compact.

[0015] Further, even in the case of using the pressure water of a pump installed outside the tank, the injected water is a small energy amount which assures the flow velocity in the underwater channel and the resistance head by mixing and inducing surrounding water by the principle of a jet pump. The power can be significantly reduced by effectively utilizing the jet which has been diffused and disappeared.

In a device in which the starting end of the submerged water channel is opened and the suction port of the mud pump is connected and piped at the end, the sediment is removed by closing the submerged water channel lid and then operating the mud pump. It can be sucked and discharged directly out of the tank in the state of pipeline transportation, and the submerged water channel has a lower suction pressure than the sedimentation tank, does not leak and contaminates the sedimentation tank, and sediments that handle light fine particles that are easy to re-suspend Also applicable to tanks.

When handling soft sediment by such a suction method, the opening and closing of the lid is, of course, performed at a slow speed. It is easy to open and close in the closed state.Furthermore, if the lid divided in the longitudinal direction is closed sequentially from the mud suction pump side and sucked, a large amount of sediment deposited outside the submerged water channel with minimum channel resistance Intensive collection and transportation at high concentrations.

In any of the above cases, the flow velocity required to transport the sediment in the pipe-shaped underwater channel,
And the associated loss resistance is not different from pipeline transport in general hydraulic transport, and it can be considered that suction and pumping are the same. The flow rate is about 0.2 m / s to 3.0 m / s, so that not only the loss resistance is small but also long-distance flow can be performed, but also a water channel curved vertically and horizontally can be handled.

[0019]

Embodiments will be described with reference to the drawings.
A cross section perpendicular to the flow direction of the settling tank 1 of FIG. 1 is formed in a V shape as shown in FIG. 2, and an underwater channel 2 is opened at the deepest part.
An axial pump 5 is provided at the end of the settling tank 1 on the outflow side of the underwater channel 2, guided by the discharge case 7, and injected into the starting end of the underwater channel 2 by the nozzle 8. At the outlet end of the submerged water channel 2 that opens to the inflow side of the settling tank 1, a mud collecting pit 1A that is one step lower is formed, and a mud pump 6 is installed.

On the upper side of the underwater channel 2, FIG.
As shown in detail in (b), the flaps 4 connected to bearings provided on the frame 3 on both side walls are oscillatingly hung down, and when a jet is generated in the underwater channel 2, it is pushed up by the water force. Then, as shown in FIG. 5D, the bridge is sequentially bridged to the next adjacent flap 4, so that the upper side of the underwater channel 2 can be closed.

In order for the flap 4 to rotate with the force of the water, the weight of the flap 4 must be reduced. However, it is necessary to use a material that resists abrasion due to the sediment to be handled or corrosiveness due to water quality.
As shown in FIG. 5C, the flap 4A is formed in a hollow body to generate buoyancy, and the weight of the underwater can be adjusted so as not to float.

In the embodiment shown in FIG. 3 in a partial sectional view, the submersible pump 25 is replaced with the submersible water passage 2 in place of the axial pump 5 of the embodiment shown in FIG.
This embodiment is installed in the sedimentation tank 1 near the starting end, and connects the discharge case 27 of the submersible pump 25 directly to the starting end of the submersible waterway 2 to improve the efficiency of the jet water facility.

FIG. 6 is a longitudinal sectional view and FIG. 7 is a transverse sectional view. In the embodiment shown in FIG.
An underwater channel 32 having a U-shaped cross section is formed at the deepest portion, and a lid 34 as shown in a detailed cross-sectional view in FIG. The link 54 provided between the support base 55 provided on the arm 34A and the arm 34A protruding upward from the lid 34 rotates, and the lid 34 is pressed against the valve seat frame 33 to be closed or opened. Nozzle 3 for injecting pressurized water at the beginning of the underwater channel 32
8 is provided, and the sediment in the closed underwater channel 32 is fed.

FIG. 9 is a longitudinal sectional view, FIG. 10 is a cross section perpendicular to the flow direction of the settling tank, and FIG. 12 is a plan view seen from FF in FIG. A large number of underwater waterways 42 are arranged on the bottom surface, and a lid 44 provided with a hinge mechanism 62 is extended on the upper side of each underwater waterway 42 in accordance with the underwater waterway, and the upper side of the underwater waterway is opened and closed almost over the entire length. It is arranged and driven to open and close via an opening and closing chain 59.

The starting end a of the underwater channel 42 is partially opened, and the end side is connected to a suction port of a mud suction pump via a valve 60 and a mud suction pipe 50, respectively. The amount is detected, or the lid 44 is closed periodically and the valve 60 communicating with the underwater channel is opened, and the mud suction pump is operated to suck and remove the sedimentary mud in the underwater channel 42. When the concentration in the mud suction pipe 50 decreases to a certain value, the opening and closing control is sequentially performed to suck and remove the sedimentary mud in the entire underwater waterway 42.

[0026]

As described above, the present invention relates to an apparatus using an underwater water channel equipped with a flap that automatically opens and closes with a water force. There is no need to provide it, and sediment collection work can be performed only by operating the jet water facility, and the weight of the flaps in water using buoyancy can be reduced in weight to cope with sedimentation tanks that handle fine particles.

In the case where the lid which is manually opened / closed is provided in the underwater channel, the effect of preventing the re-dispersion of the deposits at the beginning of operation can be enhanced, and mechanical certainty can be obtained.

By forming a pipe for sediment collection and transfer, it is possible to directly connect and discharge the discharge port of a jet water pump using water in the tank at the beginning of the submerged water channel. The use of treated water or industrial water is not required.

Further, in the case where the suction port of the mud pump is connected directly to the end of the submerged water channel, there is no resuspension in the sedimentation tank during sediment collection and transfer, and light fine particles can be handled. In addition, it can be directly carried out of the tank, and the effect of eliminating the necessity of a jet water facility is great.

The collection and collection of sedimentation tank sediments, which had to be carried out in a conventional, complicated and large-sized machine in the water, are performed in a submerged water channel. The effect of reducing the amount of sedimentation and ensuring the stability of the sedimentation tank is exhibited, and the economic effect of providing equipment capable of handling a long distance, a wide area, and even a slight vertical and horizontal curvature is great.

[0031]

[Brief description of the drawings]

 Arrows in the drawings indicate the flow direction.

FIG. 1 is a longitudinal sectional view of an embodiment including a flap that automatically opens and closes and an axial flow pump.

FIG. 2 is a cross-sectional view of a portion A of the embodiment in FIG. 1;

FIG. 3 is a partial vertical cross-sectional view of an underwater waterway starting end side of an embodiment using a submersible pump in a jet water facility.

FIG. 4 is a detailed longitudinal sectional view of an underwater waterway part of FIG. 1 embodiment (a).
And a detailed cross-sectional view (b).

FIG. 5 is a detailed vertical sectional view of a submerged waterway part (c) in which the flap of FIG. 1 is a hollow body, and a partial detailed vertical sectional view (d) when water is passed through the submerged waterway.

FIG. 6 is a vertical sectional view of a sedimentation tank of an embodiment provided with a lid which is opened and closed artificially by using pressurized water in a jet water facility.

FIG. 7 is a cross-sectional view of a portion B having four rows of V-shaped depressions in the embodiment of FIG. 6;

FIG. 8 is a detailed sectional view of an underwater channel of the embodiment of FIG. 6;

FIG. 9 is a longitudinal sectional view of an embodiment in which a number of submerged water channels are arranged on a flat bottom and directly sucked by a mud suction pump.

FIG. 10 is a cross-sectional view of the embodiment in FIG. 9, showing a state in which a lid is partially closed.

11 is a detailed sectional view (e) and (f) of the underwater channel start end F and end D of the embodiment in FIG. 9;

FIG. 12 is a plan view as seen from line FF of the embodiment in FIG. 9;

[Explanation of symbols]

 8, 38 Nozzle 9, 39 Discharge pipe 28 Jet port 6, 36 Mud pump 37 Pressure water pipe 51 Inlet gutter 52 Outlet gutter 56 Cylinder pedestal 58 Lid opening / closing motor 61 Suction port 63 Chain mounting plate 64 Water channel formation frame

Claims (5)

[Claims] An underwater channel is provided at an inner bottom of a settling tank of a waterway or a water treatment facility, and a swingable flap is arranged on the upper side of the underwater channel in a hanging state perpendicular to the underwater channel. The water force generated by the injection of water jets into the water, the flaps are pushed up and sequentially bridged to the next stage to close the upper side of the underwater channel, form a pipe state, and deposit the sediment in the underwater channel. Equipment for transferring goods. 2. The sediment transfer facility according to claim 1, wherein the underwater weight is reduced by making the flap a hollow body or by attaching a buoyant material such as styrene foam. 3. A waterway and a water treatment facility. A lid which is artificially opened and closed is provided on an upper side of the underwater waterway which is opened at an inner bottom of a settling tank, and a facility for injecting jet water is provided at a start end. A sediment transfer facility in which the sediment in the underwater channel accumulated during opening of the sewer is closed and transported in a pipeline transport state. 4. The sediment transfer facility according to claim 1, wherein a discharge case or a discharge pipe of a jet water pump is connected and connected to a starting end of the underwater channel. 5. An underwater waterway having a lid which can be opened and closed at the upper side of the waterway or water treatment equipment settling tank, which is openable at the upper side of the waterway, and the suction port of the mud pump is provided at the end. And a connecting pipe for collecting and transferring the sediment in the underwater channel accumulated while the lid is open, by closing the lid and sucking and discharging the sediment with a mud pump.