JP3845042B2

JP3845042B2 - Water surface control device for drainage equipment

Info

Publication number: JP3845042B2
Application number: JP2002187497A
Authority: JP
Inventors: 育雄植村; 浩史石和田; 将一番場; 文内野; 恒男落合; 寛小松; 茂樹西村; 繁塚田
Original assignee: Tokyo Metropolitan Sewerage Service Corp; Tokyo Metropolitan Government; Nippon Koei Co Ltd
Current assignee: Tokyo Metropolitan Sewerage Service Corp; Tokyo Metropolitan Government; Nippon Koei Co Ltd
Priority date: 2002-06-27
Filing date: 2002-06-27
Publication date: 2006-11-15
Anticipated expiration: 2022-06-27
Also published as: JP2004027701A

Description

【０００１】
【発明の属する技術分野】
本発明は排水装置用水面制御装置、特に、雨水と汚水を合流して排水処理するための排水装置において汚水と雨水とを分水する雨水吐き室（分水人孔）内の水面を制御する制御装置に関するものである。
【０００２】
【従来の技術】
図５Ａは従来の合流式下水道分水人孔の平面図、図６Ａ及び図６Ｂは図５Ａの合流式下水道の分水人孔の晴天時の状態を示し、１は分水堰、２は流入管、３は遮集管、４は放流管、５は流入する浮遊性の夾雑物である。図７Ａ，図７Ｂ，図８Ａ及び図８Ｂは雨天時の状態である。
【０００３】
従来の分水人孔においては、晴天時は図６Ａ，図６Ｂのように流入管２から夾雑物５を含んだ汚水が遮集管３へ全量流れ込み、下水処理場、ポンプ場へ流下する。また、雨天時は図７Ａ，図７Ｂのように汚水と共に雨水も分水人孔内へ流入し、一定量以上の水量になると図８Ａ，図８Ｂに示すように流入管２と放流管４間に介挿した分水堰１を越流し、夾雑物を含んだ汚水の一部も放流管４を通じて公共用水域へと流出する。
【０００４】
【発明が解決しようとする課題】
上記のように、従来の分水人孔では、流入する浮遊性の夾雑物５が雨天時に遮集管３へ流入せず放流管４を介して公共用水域へ流出し、公共用水域の水質汚濁の原因のひとつとなっている。この要因の１つには、従来の分水人孔における雨天時の水理特性が挙げられる。従来の分水人孔では図６Ａ，図６Ｂのように晴天時は流入管２から遮集管３に向かって水面勾配が形成されるため、浮遊性夾雑物５は流れに乗って遮集管３へ全量流れ込む。しかし、雨天時においては図７Ａ，図７Ｂのように、遮集管３が水没し、遮集管３入口付近の水面が盛り上がるようになり、晴天時のように流入管２から遮集管３へ向かう水面勾配が形成されない。この状態においては浮遊性夾雑物５は遮集管３へ流入せず、分水人孔内に滞留する。さらに分水人孔への流入水量が増加し分水人孔内水深が分水堰１の高さを上回るようになると、図８Ａ，図８Ｂのように分水堰１を越流することで、流入管２から放流管４へ向かう水面勾配が形成される。この時浮遊性夾雑物５は流れに乗って放流管４を通じて公共用水域へほぼ全量流出する。
【０００５】
このような課題を解決するための手段としては、浮遊性の夾雑物５が遮集管３へ流入し易い流れを分水人孔内で発生させる必要があり、従来の分水人孔を改良し、浮遊性夾雑物の公共用水域への流出削減を行う必要がある。
【０００６】
【課題を解決するための手段】
本発明の排水装置用水面制御装置は、下水道雨水吐き室における流入管と遮集管間に介挿した、その頂面の高さを、流入管と放流管間に介挿した分水堰の高さより低くした制御板と、上記流入管と上記分水堰間に介挿せしめた、上記分水堰の天端からやや下方の位置にその下端を有するガイドウォールとを有することを特徴とする。
【０００８】
【発明の実施の形態】
以下図面によって本発明の実施例を説明する。
【０００９】
本発明においては図１及び図２に示すように上記遮集管３と上記流入管２間に制御板６を介挿し、上記制御板６の頂面の高さを分水堰１の高さより低くなるようにし、また、上記制御板６の下端と遮集管３の底面間に隙間を形成し、晴天時この隙間から汚水が遮集管３内に流れ得るようにする。また、図３及び図４に示すように上記分水堰１の天端からやや下方の位置にその下端を配置せしめた垂直ガイドウォール７を上記流入管２と分水堰１間に介挿せしめる。
【００１０】
本発明の排水装置用水面制御装置は上記のような構成であるから図１のように雨天時には制御板６を越流することで流入管２から遮集管３へ向かう水面勾配が形成され、浮遊性夾雑物５は流れに乗って遮集管３へほぼ全量流入する。さらに分水人孔への流入水量が増加し分水人孔内水深が分水堰１の高さを上回るようになると、図２のように制御板６の越流による流入管２から遮集管３へ向かう水面勾配が形成されるとともに、分水堰１を越流することによる流入管２から放流管４へ向かう水面勾配が形成される。しかし、後者の水面勾配の方が前者より大きいため、放流管４へ向かう表面流の勢力が上回り、浮遊性夾雑物５は大半が流れに乗って分水堰１を越えて放流管４へ流出し、一部のみが遮集管３へ流入することになるためその遮集効果はいまだ十分ではない。
【００１２】
この実施例によれば、雨天時において分水人孔水深が分水堰１の高さを上回るような場合においては、図４に示すようにガイドウォール７付近で水面が盛り上がるようになり、流入管２から分水堰１へ向かう水面勾配が形成されないようになる。前述の実施例のように制御板６を越流することにより流入管２から遮集管３へ向かう水面勾配が形成されるため、浮遊性夾雑物５の大半が表面流に乗って遮集管３へ流入するため遮集効果がより高くなる。
【００１３】
なお、本発明は図５Ｂその他に示すような従来の他の合流式下水道分水人孔に対しても同様に適用できる。
【００１４】
【発明の効果】
上記のように本発明の排水装置用水面制御装置によれば、浮遊性の夾雑物５が遮集管３内に流入し易い流れが発生され、浮遊性夾雑物５の公共用水域への流出削減を行うことができるようになる大きな利益がある。
【図面の簡単な説明】
【図１】本発明の排水装置用水面制御装置を用いた合流式下水道分水人孔の縦断正面図である。
【図２】本発明の排水装置用水面制御装置を用いた合流式下水道分水人孔の縦断左側面図である。
【図３】本発明の他の実施例における排水装置用水面制御装置を用いた合流式下水道分水人孔の縦断正面図である。
【図４】図３に示す排水装置用水面制御装置を用いた合流式下水道分水人孔の縦断左側面図である。
【図５Ａ】従来の合流式下水道分水人孔の平面図である。
【図５Ｂ】従来の他の合流式下水道分水人孔の平面図である。
【図６Ａ】図５Ａに示す従来の合流式下水道分水人孔の晴天時の縦断正面図である。
【図６Ｂ】図５Ａに示す従来の合流式下水道分水人孔の晴天時の縦断左側面図である。
【図７Ａ】図５Ａに示す従来の合流式下水道分水人孔の雨天時の縦断正面図である。
【図７Ｂ】図５Ａに示す従来の合流式下水道分水人孔の雨天時の縦断左側面図である。
【図８Ａ】水量が更に増大した場合の従来の合流式下水道分水人孔の雨天時の縦断正面図である。
【図８Ｂ】水量が更に増大した場合の従来の合流式下水道分水人孔の雨天時の縦断左側面図である。
【符号の説明】
１分水堰
２流入管
３遮集管
４放流管
５夾雑物
６制御板
７ガイドウォール[0001]
BACKGROUND OF THE INVENTION
The present invention controls a water surface in a rainwater discharge chamber (a diversion manhole) that divides sewage and rainwater in a drainage device for effluent treatment by merging rainwater and sewage with a drainage device. The present invention relates to a control device.
[0002]
[Prior art]
FIG. 5A is a plan view of a conventional confluence sewer diversion manhole, FIGS. 6A and 6B show the state of the diversion manhole of the confluence sewer in FIG. 5A when the sky is clear, 1 is a diversion weir, 2 is an inflow Tube 3 is a blocking tube, 4 is a discharge tube, and 5 is a floating contaminant that flows in. 7A, 7B, 8A and 8B are in a rainy state.
[0003]
In the conventional diversion manhole, in fine weather, as shown in FIGS. 6A and 6B, the entire amount of sewage containing the contaminants 5 flows from the inflow pipe 2 into the interception pipe 3, and then flows down to the sewage treatment plant and the pump station. 7A and 7B, rainwater also flows into the diversion manhole as shown in FIGS. 7A and 7B, and when the amount of water exceeds a certain level, between the inflow pipe 2 and the discharge pipe 4 as shown in FIGS. 8A and 8B. A part of the sewage containing impurities is discharged to the public water area through the discharge pipe 4.
[0004]
[Problems to be solved by the invention]
As described above, in the conventional diversion manhole, the floating contaminants 5 that flow in do not flow into the intercepting pipe 3 in the rain, but flow into the public water area through the discharge pipe 4, and the water quality of the public water area It is one of the causes of pollution. One of the factors is the hydraulic characteristics at the time of rain in a conventional diversion manhole. In a conventional diversion manhole, as shown in FIGS. 6A and 6B, a water surface gradient is formed from the inflow pipe 2 to the interception pipe 3 in fine weather, so that the floating contaminants 5 get on the flow and become the interception pipe. The whole amount flows into 3. However, in rainy weather, as shown in FIGS. 7A and 7B, the shielding tube 3 is submerged, and the water surface near the entrance of the shielding tube 3 rises, and from the inflow tube 2 to the shielding tube 3 as in fine weather. The water surface gradient toward is not formed. In this state, the floating contaminants 5 do not flow into the shielding pipe 3 and stay in the water diversion manhole. Further, when the amount of water flowing into the diversion manhole increases and the water depth in the diversion manhole exceeds the height of the diversion weir 1, it overflows the diversion weir 1 as shown in FIGS. 8A and 8B. A water surface gradient from the inflow pipe 2 to the discharge pipe 4 is formed. At this time, the floating contaminants 5 get on the flow and almost all flow out to the public water area through the discharge pipe 4.
[0005]
As a means for solving such a problem, it is necessary to generate a flow in which the floating contaminant 5 easily flows into the intercepting pipe 3 in the diversion manhole, and the conventional diversion manhole is improved. However, it is necessary to reduce the outflow of floating contaminants to public water bodies.
[0006]
[Means for Solving the Problems]
Drainage device for water control device of the present invention, diversion weir interposed between the inlet pipe and the shield current pipe in the sewer rainwater discharge chamber, the height of the top surface of that was interposed between discharge and inlet tube pipe And a guide plate having a lower end at a position slightly below the top end of the diversion weir inserted between the inflow pipe and the diversion weir. To do.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0009]
In the present invention, as shown in FIGS. 1 and 2, a control plate 6 is inserted between the shielding tube 3 and the inflow tube 2, and the height of the top surface of the control plate 6 is set higher than the height of the diversion weir 1. In addition, a gap is formed between the lower end of the control plate 6 and the bottom surface of the shielding tube 3 so that sewage can flow into the shielding tube 3 from the gap in fine weather. Further, as shown in FIGS. 3 and 4, a vertical guide wall 7 having a lower end disposed at a position slightly below the top end of the diversion weir 1 is inserted between the inflow pipe 2 and the diversion weir 1. .
[0010]
Since the water surface control device for a drainage device of the present invention is configured as described above, a water surface gradient from the inflow pipe 2 to the interception pipe 3 is formed by overflowing the control plate 6 in the rain as shown in FIG. The floating impurities 5 ride on the flow and almost all flow into the shielding tube 3. Further, when the amount of water flowing into the diversion manhole increases and the water depth in the diversion manhole exceeds the height of the diversion weir 1, the water is collected from the inflow pipe 2 due to the overflow of the control plate 6 as shown in FIG. A water surface gradient toward the pipe 3 is formed, and a water surface gradient from the inflow pipe 2 to the discharge pipe 4 by flowing over the diversion weir 1 is formed. However, since the latter water surface gradient is larger than the former, the force of the surface flow toward the discharge pipe 4 is greater, and the floating contaminants 5 mostly ride on the flow and flow over the diversion weir 1 and flow into the discharge pipe 4. However, since only a part flows into the intercepting pipe 3, the intercepting effect is not yet sufficient.
[0012]
According to this embodiment, when the water diversion depth exceeds the height of the diversion weir 1 in rainy weather, the water surface rises near the guide wall 7 as shown in FIG. A water surface gradient from the pipe 2 toward the diversion weir 1 is not formed. Since the water surface gradient from the inflow pipe 2 to the intercepting pipe 3 is formed by flowing over the control plate 6 as in the above-described embodiment, most of the floating impurities 5 ride on the surface flow and the intercepting pipe. Since it flows into 3, the shielding effect becomes higher.
[0013]
The present invention can be similarly applied to other conventional merging sewer diversion manholes as shown in FIG. 5B and others.
[0014]
【The invention's effect】
As described above, according to the water surface control device for a drainage device of the present invention, a flow in which the floating contaminant 5 easily flows into the intercepting pipe 3 is generated, and the floating contaminant 5 flows into the public water area. There is a big benefit to be able to make reductions.
[Brief description of the drawings]
FIG. 1 is a longitudinal front view of a combined sewer diversion manhole using a water surface control device for a drainage device of the present invention.
FIG. 2 is a longitudinal left side view of a combined sewer diversion manhole using the water surface control device for a drainage device of the present invention.
FIG. 3 is a longitudinal front view of a combined sewer diversion manhole using a drainage water surface control device according to another embodiment of the present invention.
4 is a longitudinal left side view of a combined sewer diversion manhole using the water surface control device for drainage device shown in FIG. 3; FIG.
FIG. 5A is a plan view of a conventional merging sewer diversion manhole.
FIG. 5B is a plan view of another conventional combined sewer diversion manhole.
FIG. 6A is a longitudinal front view of the conventional combined sewer diversion manhole shown in FIG.
6B is a vertical left side view of the conventional combined sewer diversion manhole shown in FIG.
7A is a longitudinal front view of the conventional combined sewer diversion manhole shown in FIG. 5A when it rains.
7B is a longitudinal left side view of the conventional combined sewer diversion manhole shown in FIG. 5A when it rains.
FIG. 8A is a longitudinal front view of a conventional combined sewer diversion manhole when raining, when the amount of water further increases.
FIG. 8B is a vertical left side view of a conventional merged sewer diversion manhole when it is raining, when the amount of water further increases.
[Explanation of symbols]
1 diversion weir 2 inflow pipe 3 interception pipe 4 discharge pipe 5 contaminants 6 control board 7 guide wall

Claims

A control plate disposed between the inlet pipe and the shield current pipe in the sewer rainwater discharge chamber,
Wherein disposed between the inlet pipe and the diversion weir, a guide wall having a slightly its lower end to a position below the top end of the diversion weir,
Have
The diversion weir is disposed between the inlet pipe and the outlet pipe;
The height of the top surface of the control plate is lower than the height of the diversion weir ,
The lowermost height of the inflow pipe is equal to the lowermost height of the shielding pipe,
The lower surface of the control plate is higher than the lowermost part of the inflow pipe and the lowermost part of the shielding pipe,
Water surface control device for drainage equipment.