JP2004027701A

JP2004027701A - Water level control device for drainage system

Info

Publication number: JP2004027701A
Application number: JP2002187497A
Authority: JP
Inventors: Ikuo Uemura; 植村　育雄; Hiroshi Ishiwada; 石和田　浩史; Masakazu Banba; 番場　将一; Fumi Uchino; 内野　文; Tsuneo Ochiai; 落合　恒男; Hiroshi Komatsu; 小松　寛; Shigeki Nishimura; 西村　茂樹; Shigeru Tsukada; 塚田　繁
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: 2004-01-29
Anticipated expiration: 2022-06-27
Also published as: JP3845042B2

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem of forming one of causes of water pollution in a public water area because floating inflow impurities flow out to the public water area in rainy weather without flowing into an intercepting pipe in a diversion manhole of conventional combined sewerage. <P>SOLUTION: In this water level control device for a drainage system, a control plate is interposed between an inflow pipe and the intercepting pipe, and the height of the top face of the control plate is lowered than the height of a diversion weir interposed between the inflow pipe and a discharge pipe. A guide wall with its lower end arranged in a position slightly below the top end of the diversion weir is interposed between the inflow pipe and the diversion weir. <P>COPYRIGHT: (C)2004,JPO

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制御板を介挿し、この制御板の頂面の高さを、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ことを特徴とする。
【０００７】
また、本発明の排水装置用水面制御装置は、上記分水堰の天端からやや下方の位置にその下端を配置せしめたガイドウォールを上記流入管と上記分水堰間に介挿せしめたことを特徴とする。
【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。
【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。
【００１１】
従って、本発明の他の実施例においては図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。
【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]
TECHNICAL FIELD OF THE INVENTION
The present invention controls a water level in a rainwater discharge chamber (water diversion hole) that separates sewage and rainwater in a water level control device for a drainage device, particularly, a drainage device for merging rainwater and sewage to perform drainage treatment. The present invention relates to a control device.
[0002]
[Prior art]
FIG. 5A is a plan view of a conventional merging sewer diversion manhole, and FIGS. 6A and 6B show a state of the confluence sewer diversion manhole of FIG. The pipe 3 is an intercepting pipe, 4 is a discharge pipe, and 5 is a floating contaminant flowing therein. FIGS. 7A, 7B, 8A and 8B show a state during rainy weather.
[0003]
In a conventional diversion manhole, when the weather is fine, as shown in FIGS. 6A and 6B, the entire amount of sewage containing impurities 5 flows from the inflow pipe 2 into the interception pipe 3, and flows down to the sewage treatment plant and the pumping station. 7A and 7B, rainwater flows into the diversion manhole together with sewage, and when the amount of water exceeds a certain amount, as shown in FIGS. 8A and 8B, between the inflow pipe 2 and the discharge pipe 4 as shown in FIGS. A part of the sewage containing impurities is also 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 inflowable contaminants 5 do not flow into the intercepting pipe 3 in rainy weather, but flow out to the public water area via the discharge pipe 4, and the water quality of the public water area is increased. It is one of the causes of pollution. One of the factors is the hydraulic characteristics of a conventional diversion manhole in rainy weather. In a conventional diversion manhole, as shown in FIG. 6A and FIG. 6B, when the weather is fine, a water surface gradient is formed from the inflow pipe 2 to the interception pipe 3, so that the floating impurities 5 ride on the flow and intercept the interception pipe. 3. Flow all into 3. However, in the rainy weather, as shown in FIGS. 7A and 7B, the intercepting tube 3 is submerged, and the water surface near the entrance of the intercepting tube 3 rises. No water surface gradient is formed. In this state, the buoyant contaminants 5 do not flow into the interceptor pipe 3 but stay in the diversion manhole. Further, when the amount of inflow water into the diversion manhole increases and the depth in the diversion manhole becomes higher than the height of the diversion weir 1, the overflow of the diversion weir 1 is performed 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, almost all of the buoyant contaminants 5 flow into the public water area through the discharge pipe 4 along with the flow.
[0005]
As a means for solving such a problem, it is necessary to generate a flow in which the floating impurities 5 easily flow into the interceptor pipe 3 in the diversion manhole. In addition, it is necessary to reduce the outflow of floating contaminants into public water bodies.
[0006]
[Means for Solving the Problems]
The water level control device for a drainage device of the present invention includes a control plate interposed between the inflow pipe and the intercepting pipe in the sewer storm drainage chamber, and the height of the top surface of the control plate inserted between the inflow pipe and the discharge pipe. It is characterized by being lower than the height of the diversion weir.
[0007]
Further, in the water level control device for a drainage device of the present invention, a guide wall having a lower end disposed at a position slightly below the top end of the diversion weir is inserted between the inflow pipe and the diversion weir. It is characterized by.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0009]
In the present invention, as shown in FIGS. 1 and 2, a control plate 6 is interposed between the intercepting pipe 3 and the inflow pipe 2, and the height of the top surface of the control plate 6 is higher than the height of the diversion weir 1. Also, a gap is formed between the lower end of the control plate 6 and the bottom surface of the interceptor tube 3 so that sewage can flow into the interceptor tube 3 from this gap when the weather is fine.
[0010]
Since the water level control device for a drainage device of the present invention has the above-described configuration, a water surface gradient from the inflow pipe 2 to the interception pipe 3 is formed by flowing over the control plate 6 in rainy weather as shown in FIG. Almost all of the buoyant contaminants 5 flow into the interceptor tube 3 along with the flow. Further, when the amount of water flowing into the diversion manhole increases and the water depth in the diversion manhole becomes higher than the height of the diversion weir 1, as shown in FIG. A water surface gradient heading toward the pipe 3 is formed, and a water surface gradient heading from the inflow pipe 2 to the discharge pipe 4 by flowing over the diversion weir 1 is formed. However, since the latter has a greater water surface gradient than the former, the surface flow toward the discharge pipe 4 exceeds the power, and most of the buoyant impurities 5 flow along the flow weir 1 and flow out to the discharge pipe 4. However, since only a part flows into the interception pipe 3, the interception effect is not yet sufficient.
[0011]
Therefore, in another embodiment of the present invention, as shown in FIGS. 3 and 4, a vertical guide wall 7 having a lower end located slightly below the top end of the diversion weir 1 is combined with the inflow pipe 2. Insert between diversion weir 1.
[0012]
According to this embodiment, when the depth of the diversion manhole 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 to the diversion weir 1 is not formed. By flowing over the control plate 6 as in the above-described embodiment, a water surface gradient from the inflow pipe 2 to the intercepting pipe 3 is formed, so that most of the floating impurities 5 ride on the surface flow and intercept the pipe. 3, the shielding effect becomes higher.
[0013]
In addition, the present invention can be similarly applied to other conventional confluent sewer diversion human holes as shown in FIG. 5B and the like.
[0014]
【The invention's effect】
As described above, according to the water level control device for a drainage device of the present invention, a flow in which the floating impurities 5 easily flow into the intercepting pipe 3 is generated, and the floating impurities 5 flow out to the public water area. There is a great benefit that reductions can be made.
[Brief description of the drawings]
FIG. 1 is a vertical sectional front view of a combined sewer diversion human hole using a water level control device for a drainage device of the present invention.
FIG. 2 is a vertical sectional left side view of a merging sewer diversion human hole using the water level control device for a drainage device of the present invention.
FIG. 3 is a vertical sectional front view of a combined sewer water separation human hole using a water level control device for a drainage device according to another embodiment of the present invention.
FIG. 4 is a vertical sectional left side view of a combined sewer diversion human hole using the water level control device for a drainage device shown in FIG. 3;
FIG. 5A is a plan view of a conventional confluent sewer diversion manhole.
FIG. 5B is a plan view of another conventional confluent sewer diversion manhole.
FIG. 6A is a vertical sectional front view of the conventional combined sewer drainage manhole shown in FIG. 5A when the weather is fine.
FIG. 6B is a vertical sectional left side view of the conventional merging sewer diversion human hole shown in FIG. 5A when the weather is fine.
7A is a vertical sectional front view of the conventional combined sewer drainage manhole shown in FIG. 5A when it rains.
7B is a vertical sectional left side view of the conventional combined sewer drainage manhole shown in FIG. 5A in rainy weather.
FIG. 8A is a vertical sectional front view of a conventional combined sewer drainage manhole in rainy weather when the amount of water further increases.
FIG. 8B is a vertical sectional left side view of a conventional merging sewer drainage manhole in rainy weather when the amount of water further increases.
[Explanation of symbols]
1 diversion weir 2 inflow pipe 3 interception pipe 4 discharge pipe 5 foreign matter 6 control board 7 guide wall

Claims

A control plate was inserted between the inflow pipe and the interceptor pipe in the sewer storm drainage chamber, and the height of the top surface of this control plate was made lower than the height of the diversion weir inserted between the inflow pipe and the discharge pipe. Characteristic water level control device for drainage equipment.

2. A water surface for a drainage device according to claim 1, wherein a guide wall having a lower end located slightly below a top end of the diversion weir is inserted between the inflow pipe and the diversion weir. Control device.