JP2600356Y2 - Sand basin structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sand basin structure for removing sediment such as sand in a water treatment facility such as a sewage treatment facility or a water purification facility.

[0002]

2. Description of the Related Art Generally, a sedimentation basin is provided in a sewage treatment facility or a water purification facility in order to remove sediment such as sedimentation from inflowing sewage or raw water taken in. As shown in FIG. 3, the sand basin 1 is composed of a plurality of water passages 3 in which raw water 2 flows down from the upstream side to the downstream side, and a sand pit 4 is formed at the bottom of each water passage 3 on the upstream side. I have. The sediment that has flowed into each channel 3 together with the raw water 2 sinks from the one having the higher specific gravity as the raw water 2 flows down, and is sequentially deposited at the bottom of the sediment pit 4 and the channel 3 downstream of the sand pit 4. For this reason, the sediment is transferred to the sand pit 4 at regular intervals or when an appropriate amount of sediment is deposited on the bottom of the water channel 3.

[0005] Reference numeral 5 denotes a sedimentation scraping device having a pressure water injection nozzle provided for this purpose. The sedimentation scraping device 5 is positioned near the bottom on the downstream side following the sedimentation pit 4. By jetting a jet stream from the opening 6 to the upstream side, the sediment deposited on the bottom of the water channel 3 is scraped. The settling device 5 is provided alone in the width direction of the water channel 3 of the settling basin 1 and is arranged in a plurality of stages at appropriate intervals in the flow direction of the raw water 2, thereby effectively transferring the settling sand. Can be.

[0004] A sand-lifting device 7 is provided in the sand settling pit 4 of each channel 3, and sand is lifted by the sand-lifting device 7. Further, a dust removing device 8 is provided downstream of the sedimentation scraping device 5, and the thing from which suspended matter is removed by the dust removing device 8 is sent to the next system as treated water 9.

[0005]

However, in the above-mentioned conventional sand basin, a sand-raising device and a sand-lifting device are provided in each channel, or a traveling sand-lifting device is provided when the sand-lifting device is not provided in each channel. There is a problem that the installation of the device is necessary, and therefore the installation cost and the maintenance are required.

An object of the present invention is to solve the above-mentioned problems, and to reduce the installation cost and maintenance cost of a device for scraping and raising sand.

[0007]

The sand basin structure of the present invention is as follows.
A plurality of water channels through which raw water flows from the upstream to the downstream are provided.In each channel, a sedimentation pit is formed at the bottom, and pressure water is directed toward the sedimentation pit near the bottom on the downstream side following the sedimentation pit. In a sand basin structure provided with a settling device for injecting sand, the sand pits of each of the water channels are provided in a line in the width direction of the water channel, and at the position of the sand pit, the sand pits can be communicated with the partition walls forming the water channels. In addition to installing a rollable sediment scraping device that sprays pressurized water toward the adjacent sedimentation pit, a sandlifting device was installed in the sedimentation pit in the outermost water channel. Things.

[0008]

According to the above construction, the sedimentation pits of each channel are provided in a line in the width direction of the channel, and at the position of the sedimentation pit, a gate portion capable of communicating the sedimentation pits with the partition wall forming each channel is provided. By opening the gate, the sand pits can communicate with each other. Then, after the sand pits are communicated with each other, the rollable sand rake device installed at the gate part injects pressure water toward the adjacent sand pit,
Sediment can be sequentially transferred to the sand pit in the outer channel. The transferred sediment can be sand-lifted by a sand-lifting device installed in a sand-pit in the outermost waterway.

[0009]

FIG. 1 shows a sand basin structure according to an embodiment of the present invention.
This will be described with reference to the overall configuration diagram of FIG. Since the sand basin structure of this embodiment is almost the same as the conventional sand basin structure described above with reference to FIG. 3, parts having the same configuration and the same action are denoted by the same reference numerals, and detailed description thereof will be omitted.

The sand basin 1 is composed of a plurality of water passages 3 through which raw water 2 flows from the upstream side to the downstream side. A sand pit 4 is formed at the bottom of each water passage 3 on the upstream side. The sedimentation pits 4 are provided in a line in the width direction of the water channel 3, and at the position of the sedimentation pit 4, a gate portion 11 that can communicate the sedimentation pits 4 is provided on a partition wall 10 that forms each water channel 3. .

In the vicinity of the bottom on the downstream side following the sand pit 4, pressurized water is injected toward the sand pit 4, and the sand deposited on the bottom on the downstream side of the sand pit 4 is transported in the direction of the sand pit 4. A scraping device 5 is provided. Also, each gate unit 11 is provided with a 180 ° rollable sediment scraping device 12 for injecting pressurized water toward the adjacent sedimentation pit 4,
The apertures 6 of the pressure water injection nozzle are all installed in the same direction.

Sand setting devices 7a and 7b are installed in the sand settling pits 4 at both outer end waterways, and a dust removing device 8 is provided downstream of the sand setting device 5. In the sand basin 1 having the above-described configuration, the sediment flowing into each of the water channels 3 together with the raw water 2 and deposited on the bottom of the water channel 3 on the downstream side of the sand pit 4 is:
In the same manner as in the prior art, the water is transported toward the upstream side by the sand settling device 5 and accumulated in the sand settling pits 4 of each waterway 3.

The settling sand accumulated in the sand setting pit 4 opens the gate portion 11 to allow the sand setting pits 4 to communicate with each other. Then, as shown in the drawing, pressure is applied from the sand setting device 12 to the adjacent sand setting pit 4. By jetting water, the water is sequentially transferred to the adjacent sand pit 4. Then, the sand is finally collected in the sand setting pits 4 of the outermost water channel, so that the sand is set up by the sand setting devices 7a and 7b in the sand setting pits 4 at both outer ends. The suspended matter that has flowed down to the downstream side of the sedimentation scraping device 5 is removed by the dust removing device 8, and the matter from which both the sedimentation and suspended matter have been removed is sent to the next system as treated water 9.

As described above, all the openings 6 of the pressure water injection nozzles of the sand scraping device 12 provided in the gate portion 11 are installed in the same direction, and the sand is set only toward the outer sand pit 4 on one side. The sand may be transported and sand-lifted by the sand-lifting devices 7a and 7b on both outer sides, or the sand-lifting device 7b may be stopped and repaired. Further, since the sand settling device 12 can roll, the sand set may be conveyed so that the sand lifting device 7a can be stopped in the opposite manner to the above. Alternatively, the sand scraping device 12 is installed such that the opening 6 of the pressure water injection nozzle faces both outer sides with the center of the sand basin as a boundary, and the sand is transferred toward the sand pit 4 on both outer sides. Alternatively, the sand may be lifted by both of the sand lifting devices 7a and 7b.

[0015]

[Effects of the Invention] As described above, the gate part which can communicate the sand pits is provided, and the sand is sequentially transferred to the sand pit of the outer channel by the sand rake device installed at the gate part. By adopting a configuration in which the sand is lifted by the sand-lifting device in the sedimentation pit of the waterway, the number of sand-lifting devices can be reduced. Thereby, the installation cost and maintenance cost of the sand lifting device can be reduced.

[0016] In addition, since the moving direction of the settling sand can be changed by making the settling device of the gate portion rollable, it is sent only to the settling pit of one of the outermost waterways, where it is moved by the settling device. Since the sand is lifted and the other sand lifting device can be stopped to perform repairs and the like, maintenance can be facilitated.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an entire configuration of a sand basin structure according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the sand basin structure of FIG.

FIG. 3 is an explanatory diagram showing an entire configuration of a conventional sand basin structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Settling basin 2 Raw water 3 Waterway 4 Sand setting pit 5 Sand setting device 7a Sand raising device 7b Sand setting device 10 Partition wall 11 Gate part 12 Sand setting device

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B01D 21/00-21/34

Claims (1)

(57) [Scope of request for utility model registration] A plurality of water passages through which raw water flows from an upstream side to a downstream side are provided. In each of the water passages, a sand pit is formed at a bottom portion, and a sand pit is formed near a downstream bottom portion following the sand pit. In a sand basin structure provided with a sedimentation rake device for injecting pressurized water toward the water passage, the sand pits of each of the water passages are arranged in a row in the width direction of the water passage, and at the position of the sand pit, a sedimentation pit is formed on a partition wall forming each water passage. A gate is provided to allow communication between the pits, and a rollable sedimentation device that injects pressurized water toward the adjacent sedimentation pit is installed in this gate, and lifts to the sand pit in the outermost water channel. A sand basin structure with sand equipment installed.