JPH07102282B2 - Sand basin structure - Google Patents
Sand basin structureInfo
- Publication number
- JPH07102282B2 JPH07102282B2 JP2054637A JP5463790A JPH07102282B2 JP H07102282 B2 JPH07102282 B2 JP H07102282B2 JP 2054637 A JP2054637 A JP 2054637A JP 5463790 A JP5463790 A JP 5463790A JP H07102282 B2 JPH07102282 B2 JP H07102282B2
- Authority
- JP
- Japan
- Prior art keywords
- sand
- water
- pressure water
- pressure
- settling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 産業上の利用分野 本発明は下水処理施設や浄水施設などの水処理設備にお
ける沈砂池構造に関する。Description: TECHNICAL FIELD The present invention relates to a sand basin structure in a water treatment facility such as a sewage treatment facility or a water purification facility.
従来の技術 従来、下水処理施設や浄水施設においては流入下水や取
水した原水から砂などの濁質分を除去する設備として沈
砂池が設けられている。そして、沈砂池には底部に堆積
した沈砂を沈砂ピットにかき寄せる装置が設けられてお
り、かき寄せ装置としては、フライトコンベア、ミーダ
などの機械的動作により沈砂をかき寄せる装置と、沈砂
池の底部に配置した圧力水噴射ノズルから噴射する圧力
水のジェット水流によって沈砂をかき寄せるものがあっ
た。2. Description of the Related Art Conventionally, a sewage treatment facility or a water purification facility is provided with a sand basin as a facility for removing suspended matter such as sand from inflowing sewage or taken raw water. The sand basin is equipped with a device for scraping the sediment deposited at the bottom into the sand pit.As the scraping device, a device for scraping the sand by mechanical operations such as a flight conveyor and a feeder, and a bottom of the sand basin There was a method in which the settling sand was attracted by the jet stream of the pressure water jetted from the pressure water jet nozzle arranged at.
発明が解決しようとする課題 しかし、上記した従来の機械的動作を行うかき寄せ装置
を用いる沈砂池においては、降雨時などに濁質分が増加
して沈砂池に堆積する沈砂量が急増した場合には、駆動
不能となることがあった。また、ジェット水流により沈
砂をかき寄せる装置を用いる沈砂池においては、圧力水
噴射ノズルが堆積した沈砂に埋没した場合に、ジェット
水流が水平方向に噴射されても堆積した沈砂による水平
方向の抵抗が強いために、抵抗が弱い垂直方向にジェッ
ト水流が曲げられ、沈砂を水平方向に移動させる効果が
半減する問題があった。たとえば、沈砂が圧力水噴射ノ
ズルの前方に深さ100mm,長さ3000mmにわたって堆積する
場合に、沈砂を3m移送するに必要な圧力水は、水量2m3/
分，水圧80mAq，噴射時間1.5分であるが、圧力水噴射ノ
ズルが沈砂中に埋没し、沈砂が圧力水噴射ノズルの前方
に深さ500mm,長さ3000mmにわたって堆積した場合に、沈
砂を3m移送するに必要な圧力水は、水量4.5m3/分，水圧
100mAq，噴射時間2.5分となり、使用水量および消費電
力が４倍となる問題があった。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in a sand basin using a scraping device that performs the above-described conventional mechanical operation, when the amount of sediment deposited in the sand basin increases rapidly due to an increase in suspended matter during rainfall or the like. Was sometimes unable to drive. Also, in a sand basin that uses a device that draws sand by a jet stream, when the pressure water jet nozzle is buried in the accumulated sand, the horizontal resistance due to the deposited sand is Since it is strong, the jet water flow is bent in the vertical direction where the resistance is weak, and there is a problem that the effect of moving the sediment horizontally is reduced by half. For example, when the sediment is deposited in front of the pressure water jet nozzle over a depth of 100 mm and a length of 3000 mm, the pressure water required to transfer the sediment 3 m is 2 m 3 /
Min, water pressure 80mAq, jet time 1.5 minutes, but when the pressure water jet nozzle is buried in the sand settling and the sand settles in front of the pressure water jet nozzle over a depth of 500 mm and a length of 3000 mm, the sand settled by 3 m the pressure water needed to be, the amount of water 4.5m 3 / minute, the water pressure
There was a problem that the amount of water used and the power consumption were quadrupled because the injection time was 100 mAq and the injection time was 2.5 minutes.
本発明は上記課題を解決するもので、沈砂の堆積量が急
増したときにおいても比較的少ない水量で沈砂を沈砂ピ
ットに移送することができる沈砂池構造を提供すること
を目的とする。The present invention solves the above problems, and an object of the present invention is to provide a sand basin structure capable of transferring sand to a sand pit with a relatively small amount of water even when the amount of accumulated sand rapidly increases.
課題を解決するための手段 上記課題を解決するために本発明は、原水が上流側から
下流側に向けて流通し、上流側の底部に沈砂ピットが形
成されるとともに、沈砂ピットに続く下流側に砂だまり
部が形成される沈砂池において、砂だまり部の底部近傍
に上流側に向けて圧力水を噴射する圧力水噴射ノズルを
設け、砂だまり部の底部に砂利層を形成するとともに、
砂利層内に希釈水を供給する希釈水管を設けた構成とし
たものである。Means for Solving the Problems In order to solve the above problems, the present invention circulates raw water from an upstream side to a downstream side, and a sand pit is formed at the bottom of the upstream side, and a downstream side following the sand pit. In a sand basin in which a sand pool is formed, a pressure water jet nozzle that sprays pressure water toward the upstream side is provided near the bottom of the sand pool, and a gravel layer is formed at the bottom of the sand pool.
It is configured such that a dilution water pipe for supplying dilution water is provided in the gravel layer.
また、砂だまり部における流路巾が底部側ほど狭くなる
ように、双方の側壁面を傾斜面に形成した構成としたも
のである。Further, both side wall surfaces are formed to be inclined surfaces so that the width of the flow path in the sand trap becomes narrower toward the bottom side.
作用 上記した構成により、原水とともに沈砂池に流入した濁
質分は比重に基づく沈降速度に応じて順次に砂だまり部
に沈降して堆積する。そして、一定期間ごとにあるいは
砂だまり部に適当量の沈砂が堆積したときに、圧力水噴
射ノズルから圧力水を沈砂ピットに向けて水平方向に噴
射するとともに、希釈水管から砂利層に希釈水を供給す
る。砂利層に供給された希釈水は砂利層表面から全面的
に噴出し、沈砂層を上方に押し上げるように作用すると
ともに、沈砂層に浸透して沈砂層の流動性を高めるよう
に作用する。このため、圧力水ジェット水流に対する沈
砂層の抵抗が減じられるので、砂だまり部に堆積した沈
砂がジェット水流によって容易に沈砂ピットに移送する
ことができ、圧力水の水量、水圧の低減および噴射時間
の短縮を図ることが可能となる。Action With the above configuration, the suspended matter that has flowed into the sand basin together with the raw water sequentially settles and accumulates in the sand basin according to the settling speed based on the specific gravity. Then, at regular intervals or when an appropriate amount of sand is deposited in the sand pool, pressure water is jetted horizontally from the pressure water jet nozzle toward the sand pit, and dilution water is piped to the gravel layer from the dilution water pipe. Supply. The diluting water supplied to the gravel layer jets out entirely from the surface of the gravel layer and acts to push up the settling layer and to penetrate the settling layer to increase the fluidity of the settling layer. For this reason, the resistance of the sand settling layer to the pressure water jet water flow is reduced, so the sand settling in the sand basin can be easily transferred to the sand pit by the jet water flow, reducing the amount of pressure water, the water pressure and the injection time. Can be shortened.
また、砂だまり部に堆積した沈砂は両側の傾斜面に案内
されて流路の中心に向けて集まりながら圧力水噴射ノズ
ルが配置された底部に降下するので、ジェット水流によ
る沈砂のかき寄せ対象巾を挟めることができ、圧力水噴
射ノズルの個数を低減するとともに、圧力水の水量、水
圧の低減および噴射時間の短縮をさらに促進することが
可能となる。In addition, the settled sand accumulated in the sand pool is guided by the inclined surfaces on both sides and gathers toward the center of the flow path while descending to the bottom where the pressure water jet nozzle is arranged. Since the number of pressure water injection nozzles can be reduced, it is possible to further reduce the amount of pressure water, the water pressure, and the injection time.
実施例 以下本発明の一実施例を図面に基づいて説明する。第１
図において、沈砂池１は原水２が上流側から下流側に流
通する流路をなしており、沈砂池１の底部には上流側に
位置して沈砂ピット３が形成されるとともに、沈砂ピッ
ト３に続く下流側には砂だまり部４が形成されている。
そして、砂だまり部４における両側壁面５は傾斜面をな
し、流路巾が底部側ほど狭く形成されており、砂だまり
部４の底部には砂利層６が形成されている。また、砂利
層６の内部には希釈水７を供給するための第1,第２の希
釈水管8a,8bが原水２の流れ方向に沿って配設されてお
り、第1,第２の希釈水管8a,8bにはそれぞれ適当間隔を
おいて複数の噴射口９が形成されている。さらに、第1,
第２の希釈水管8a,8bには希釈水供給管10が枝管10a,10b
を介して接続されており、各枝管10a,10bにはそれぞれ
電動式開閉弁11a,11bが介装されている。また、希釈水
供給管10の途中には希釈水ポンプ12が介装されている。Embodiment An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, a sand basin 1 forms a flow path through which raw water 2 flows from an upstream side to a downstream side, and a sand pit 3 is formed at the bottom of the sand basin 1 at the upstream side and a sand pit 3 is formed. A sand pool 4 is formed on the downstream side following.
Both side wall surfaces 5 of the sand basin 4 are inclined, and the width of the channel is narrower toward the bottom side, and a gravel layer 6 is formed at the bottom of the sand basin 4. Further, inside the gravel layer 6, first and second dilution water pipes 8a and 8b for supplying the dilution water 7 are arranged along the flow direction of the raw water 2, and the first and second dilution water are provided. The water pipes 8a, 8b are formed with a plurality of injection holes 9 at appropriate intervals. In addition, the first
The second dilution water pipes 8a and 8b are provided with the dilution water supply pipe 10 and branch pipes 10a and 10b.
The branch pipes 10a, 10b are respectively provided with electrically operated on-off valves 11a, 11b. In addition, a dilution water pump 12 is provided in the middle of the dilution water supply pipe 10.
そして、砂だまり部４の底部近傍に位置して第1,第2,第
３の圧力水噴射ノズル13a,13b,13cが配置されており、
各圧力水噴射ノズル13a,13b,13cは上流側から下流側に
向けて適当間隔をおいて設けられている。また、各圧力
水噴射ノズル13a,13b,13cはそれぞれ砂だまり部４にお
ける流路の巾方向に適当間隔をおいて複数箇所に設けら
れている。The first, second and third pressure water jet nozzles 13a, 13b and 13c are arranged near the bottom of the sand pool 4.
The pressure water jet nozzles 13a, 13b, 13c are provided at appropriate intervals from the upstream side to the downstream side. The pressure water jet nozzles 13a, 13b, 13c are provided at a plurality of positions in the sand pool 4 at appropriate intervals in the width direction of the flow path.
そして、各圧力水噴射ノズル13a,13b,13cには圧力水供
給管14が枝管14a,14b,14cを介して接続されており、各
枝管14a,14b,14cの途中にはそれぞれ電動式開閉弁15a,1
5b,15cが介装されている。さらに、圧力水供給管14の途
中には圧力水ポンプ16が介装されている。さらに、希釈
水供給管10および圧力水供給管14は貯水タンク17に連通
している。A pressure water supply pipe 14 is connected to each pressure water injection nozzle 13a, 13b, 13c via a branch pipe 14a, 14b, 14c, and each branch pipe 14a, 14b, 14c is electrically driven in the middle. Open / close valve 15a, 1
5b and 15c are installed. Further, a pressure water pump 16 is provided in the middle of the pressure water supply pipe 14. Further, the dilution water supply pipe 10 and the pressure water supply pipe 14 communicate with the water storage tank 17.
以下、上記構成における作用について説明する。沈砂池
１に流入した原水２は上流側から下流側に向けて流通
し、原水２とともに沈砂池１に流入した濁質分は比重に
基づく沈降速度に応じて順次砂だまり部４に沈降して沈
砂18として堆積する。そして、一定期間ごとにあるいは
砂だまり部４に適当量の沈砂18が堆積したときにかき寄
せ操作を行う。かき寄せ操作は沈砂18を上流側から下流
側に順次先送りして行う。The operation of the above configuration will be described below. The raw water 2 flowing into the sand basin 1 flows from the upstream side to the downstream side, and the suspended matter that has flowed into the sand basin 1 together with the raw water 2 is sequentially settled in the sand accumulation part 4 according to the sedimentation velocity based on the specific gravity. It deposits as settling sand 18. Then, the scraping operation is performed at regular intervals or when a suitable amount of the settled sand 18 is accumulated in the sand pool portion 4. The scraping operation is performed by sequentially advancing the settling sand 18 from the upstream side to the downstream side.
はじめに、電動式開閉弁11aを開放し、希釈水ポンプ12
によって貯水タンク17の水を希釈水７として第１の希釈
水管8aに供給する。また、電動式開閉弁15aを開放し、
圧力水ポンプ16によって貯水タンク17の水を圧力水19と
して第１の圧力水噴射ノズル13aに供給する。そして、
第１の圧力水噴射ノズル13aから圧力水19を上流側の沈
砂ピット３に向けて水平方向に噴射するとともに、第１
の希釈水管8aから砂利層６に希釈水７を供給する。砂利
層６に供給された希釈水７は砂利層６の表面から全面的
に噴出し、沈砂層を上方に押し上げるように作用すると
ともに、沈砂層内に浸透して沈砂18の流動性を高めるよ
うに作用する。このため、第１の圧力水噴射ノズル13a
から噴出する圧力水19のジェット流に対する沈砂18の抵
抗が減じられるので、第１の圧力水噴射ノズル13aの下
流側の砂だまり部４に堆積した沈砂18がジェット水流に
よって容易に、第２の圧力水噴射ノズル13bの上流側前
方に移送される。First, open the motorized on-off valve 11a, and
The water in the water storage tank 17 is supplied as dilution water 7 to the first dilution water pipe 8a. Also, open the motorized on-off valve 15a,
The pressure water pump 16 supplies the water in the water storage tank 17 as pressure water 19 to the first pressure water injection nozzle 13a. And
The first pressure water injection nozzle 13a horizontally injects the pressure water 19 toward the sand pit 3 on the upstream side.
The dilution water 7 is supplied to the gravel layer 6 from the dilution water pipe 8a. The dilution water 7 supplied to the gravel layer 6 jets out entirely from the surface of the gravel layer 6 and acts to push up the sedimentation layer upward, and also penetrates into the sedimentation layer to enhance the fluidity of the sedimentation layer 18. Act on. Therefore, the first pressure water jet nozzle 13a
Since the resistance of the settling sand 18 to the jet flow of the pressure water 19 jetted from the water is reduced, the settling sand 18 accumulated in the sand puddle portion 4 on the downstream side of the first pressure water jet nozzle 13a can be easily removed by the jet water flow. It is transferred to the upstream side of the pressure water jet nozzle 13b.
そして、電動式開閉弁11aを閉塞するとともに電動式開
閉弁11bを開放して第２の希釈水管8bに希釈水７を供給
し、電動式開閉弁15aを閉塞するとともに電動式開閉弁1
5bを開放して第２の圧力水噴射ノズル13bに圧力水19を
供給する。そして、第２の圧力水噴射ノズル13bから圧
力水19を上流側の沈砂ピット３に向けて水平方向に噴射
するとともに、第２の希釈水管8bから砂利層６に希釈水
７を供給し、先の工程における同様の作用により、第２
の圧力水噴射ノズル13bの上流側の砂だまり部４に堆積
した沈砂18をジェット水流によって第３の圧力水噴射ノ
ズル13cの上流側前方に移送する。そして、電動式開閉
弁11bを閉塞し、電動式開閉弁15bを閉塞するとともに電
動式開閉弁15cを開放して第３の圧力水噴射ノズル13cに
圧力水19を供給し、第３の圧力水噴射ノズル13cから噴
出する圧力水19のジェット水流によって沈砂18を沈砂ピ
ット３に移送する。Then, the electric opening / closing valve 11a is closed, the electric opening / closing valve 11b is opened to supply the dilution water 7 to the second dilution water pipe 8b, the electric opening / closing valve 15a is closed, and the electric opening / closing valve 1 is opened.
5b is opened to supply the pressure water 19 to the second pressure water injection nozzle 13b. Then, the pressure water 19 is horizontally jetted from the second pressure water jet nozzle 13b toward the upstream sand pit 3, and the dilution water 7 is supplied to the gravel layer 6 from the second dilution water pipe 8b. The same action in the process of
The settling sand 18 accumulated in the sand pool portion 4 on the upstream side of the pressure water jet nozzle 13b is transferred to the front side on the upstream side of the third pressure water jet nozzle 13c by the jet water flow. Then, the electrically operated on-off valve 11b is closed, the electrically operated on-off valve 15b is closed, the electrically operated on-off valve 15c is opened, and the pressure water 19 is supplied to the third pressure water injection nozzle 13c. The sand settling 18 is transferred to the sand settling pit 3 by the jet water flow of the pressure water 19 jetted from the jetting nozzle 13c.
したがって、砂利層６に供給された希釈水７が沈砂層を
上方に押し上げるとともに、沈砂層内に浸透して沈砂の
流動性を高めるように作用することにより、圧力水19の
ジェット流に対する沈砂の抵抗を減じて砂だまり部４に
堆積した沈砂18をジェット水流によって容易に沈砂ピッ
ト３に移送することができ、圧力水19の水量、水圧の低
減および噴射時間の短縮を図ることが可能となる。Therefore, the dilution water 7 supplied to the gravel layer 6 pushes up the sand settled layer and acts so as to permeate into the sand settled layer to enhance the fluidity of the sand settled, thereby making It is possible to easily transfer the settling sand 18 accumulated in the sand puddle portion 4 by the jet water flow to the settling pit 3 by reducing the resistance, and it is possible to reduce the amount of the pressured water 19, the water pressure and the injection time. .
そして、砂だまり部４に堆積した沈砂18は傾斜面をなす
側壁面５に案内されて流路の中心に向けて集まりながら
砂だまり部４の底部に降下するので、ジェット水流によ
る沈砂18のかき寄せ対象巾を狭めることができ、第1,第
2,第３の圧力水噴射ノズル13a,13b,13cのそれぞれの個
数を低減するとともに、圧力水19の水量、水圧の低減お
よび噴射時間の短縮をさらに促進することが可能とな
る。Then, the settled sand 18 accumulated in the sand pool portion 4 is guided to the side wall surface 5 forming the inclined surface and gathers toward the center of the flow path while descending to the bottom of the sand pool portion 4, so that the settled sand 18 is attracted by the jet water flow. You can narrow the target width, the first, first
It is possible to reduce the number of each of the second and third pressure water injection nozzles 13a, 13b, 13c, and further promote the reduction of the water amount and pressure of the pressure water 19 and the reduction of the injection time.
発明の効果 以上述べたように本発明によれば、砂利層に供給された
希釈水が、砂利層表面から全面的に噴出して砂利層を上
方に押し上げるように作用するとともに、砂利層に浸透
して沈砂層の流動性を高めるように作用することによ
り、圧力水のジェット流に対する沈砂の抵抗を減じて砂
だまり部に堆積した沈砂を容易に沈砂ピットに移送する
ことができ、圧力水の水量、水圧の低減および噴射時間
の短縮を図ることが可能となる。EFFECTS OF THE INVENTION As described above, according to the present invention, the dilution water supplied to the gravel layer jets out entirely from the surface of the gravel layer and acts to push the gravel layer upward, and penetrates into the gravel layer. By acting to increase the fluidity of the sand settling layer, the resistance of the settling sand to the jet flow of pressure water can be reduced and the settling sand deposited in the sand pool can be easily transferred to the sand settling pit. It is possible to reduce the amount of water, the water pressure, and the injection time.
また、砂だまり部に堆積した沈砂が両側の傾斜面に案内
されて流路の中心に向けて集まりながら砂だまり部の底
部に降下することにより、沈砂のかき寄せ対象巾を狭め
て圧力水噴射ノズルの個数を低減することができ、圧力
水の水量、水圧の低減および噴射時間の短縮をさらに促
進することができる。In addition, the settling sand accumulated in the sand pool is guided by the inclined surfaces on both sides and gathers toward the center of the flow path and descends to the bottom of the sand pool, narrowing the width of the settling target of the sand settling and reducing the pressure water jet nozzle. It is possible to reduce the number of the water, and it is possible to further promote the reduction of the water amount and pressure of the pressure water and the shortening of the injection time.
第１図は本発明の一実施例を示す全体構成図、第２図は
同実施例における砂だまり部の縦断面図である。 １……沈砂池、２……原水、３……沈砂ピット、４……
砂だまり部、５……側壁面、６……砂利層、8a……第１
の希釈水管、8b……第２の希釈水管、13a……第１の圧
力水噴射ノズル、13b……第２の圧力水噴射ノズル、13c
……第３の圧力水噴射ノズル、18……沈砂、19……圧力
水。FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, and FIG. 2 is a vertical sectional view of a sand pool portion in the embodiment. 1 ... sand basin, 2 ... raw water, 3 ... sand pit, 4 ...
Sand pool, 5 ... Side wall surface, 6 ... Gravel layer, 8a ... 1st
Dilution water pipe, 8b ... second dilution water pipe, 13a ... first pressure water injection nozzle, 13b ... second pressure water injection nozzle, 13c
...... Third pressure water jet nozzle, 18 …… Sanding, 19 …… Pressure water.
Claims (2)
上流側の底部に沈砂ピットが形成されるとともに、沈砂
ピットに続く下流側に砂だまり部が形成される沈砂池に
おいて、砂だまり部の底部近傍に上流側に向けて圧力水
を噴射する圧力水噴射ノズルを設け、砂だまり部の底部
に砂利層を形成するとともに、砂利層内に希釈水を供給
する希釈水管を設けたことを特徴とする沈砂池構造。1. Raw water flows from upstream to downstream,
In a sand basin where a sand pit is formed at the bottom of the upstream side and a sand basin is formed at the downstream side following the sand pit, pressure water is injected near the bottom of the sand basin toward the upstream side. A sand basin structure characterized by having an injection nozzle, forming a gravel layer at the bottom of a sand pool, and a dilution water pipe for supplying dilution water into the gravel layer.
くなるように、双方の側壁面を傾斜面に形成したことを
特徴とする請求項１記載の沈砂池構造。2. The sand basin structure according to claim 1, wherein both side wall surfaces are formed as inclined surfaces so that the channel width in the sand reservoir becomes narrower toward the bottom side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2054637A JPH07102282B2 (en) | 1990-03-06 | 1990-03-06 | Sand basin structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2054637A JPH07102282B2 (en) | 1990-03-06 | 1990-03-06 | Sand basin structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03258307A JPH03258307A (en) | 1991-11-18 |
| JPH07102282B2 true JPH07102282B2 (en) | 1995-11-08 |
Family
ID=12976287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2054637A Expired - Fee Related JPH07102282B2 (en) | 1990-03-06 | 1990-03-06 | Sand basin structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07102282B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4981734B2 (en) * | 2008-03-31 | 2012-07-25 | 株式会社クボタ | Sand basin |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55152508A (en) * | 1979-05-17 | 1980-11-27 | Kunio Watabe | Machine facility for sedimentation basin |
| JPS5678607A (en) * | 1979-11-29 | 1981-06-27 | Kubota Ltd | Rapid sedimentation equipment |
| JPS5681113A (en) * | 1979-10-12 | 1981-07-02 | Upurafurenie Buodopurobuodonoo | Automatic controller for scraper mechanism of sand trap |
| JPS5847206A (en) * | 1981-09-16 | 1983-03-18 | Toshiba Mach Co Ltd | Device for measuring picture area rate in platemaking films |
| JPS6362508A (en) * | 1986-09-01 | 1988-03-18 | Maezawa Ind Inc | Method and device for transferring settled sand in sedimentation basin |
-
1990
- 1990-03-06 JP JP2054637A patent/JPH07102282B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55152508A (en) * | 1979-05-17 | 1980-11-27 | Kunio Watabe | Machine facility for sedimentation basin |
| JPS5681113A (en) * | 1979-10-12 | 1981-07-02 | Upurafurenie Buodopurobuodonoo | Automatic controller for scraper mechanism of sand trap |
| JPS5678607A (en) * | 1979-11-29 | 1981-06-27 | Kubota Ltd | Rapid sedimentation equipment |
| JPS5847206A (en) * | 1981-09-16 | 1983-03-18 | Toshiba Mach Co Ltd | Device for measuring picture area rate in platemaking films |
| JPS6362508A (en) * | 1986-09-01 | 1988-03-18 | Maezawa Ind Inc | Method and device for transferring settled sand in sedimentation basin |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03258307A (en) | 1991-11-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |