JP3729435B2

JP3729435B2 - Reducer for pipe joint

Info

Publication number: JP3729435B2
Application number: JP21125299A
Authority: JP
Inventors: 鈴木　　茂
Original assignee: 財団法人下水道新技術推進機構
Priority date: 1999-07-26
Filing date: 1999-07-26
Publication date: 2005-12-21
Anticipated expiration: 2019-07-26
Also published as: JP2001032356A

Description

【０００１】
【発明の属する技術分野】
本発明は、下水道などの上流の急勾配管渠と下流の緩勾配管渠との間に介在して水流の勢いを減少させるための管渠連結部の減勢装置に関するものである。
【０００２】
【従来の技術】
一般に、急勾配管渠１３からの勢いのある水を緩勾配管渠１４へ流し込むとき、連結部分に水流の勢いを減じるための装置が介在される。
雨水の場合には、図９に示すように、深さの深い雨水枡１５を介在し、急勾配管渠１３と緩勾配管渠１４を雨水枡１５の底面よりも少し上に連結して貯溜部１８とする。急勾配管渠１３からの勢いのある水は、貯溜部１８内の貯溜水に落下して勢いが減じられ、緩勾配管渠１４へ流れ込む。この貯溜部１８には、急勾配管渠１３から水と一緒にながれてきた泥、小石、ごみなどの汚泥物１７が貯溜される。そして、ときどき蓋体１６をとって汚泥物１７を除去するようになっている。
【０００３】
これに対し、下水の場合には、図８（ａ）（ｂ）に示すように、深さの浅いインバート本体１０を介在し、急勾配管渠１３と緩勾配管渠１４との間には、通過溝部１２が形成され、上面に蓋体１１を被せてなるものである。そして、急勾配管渠１３からの勢いのある下水は、通過溝部１２を通り緩勾配管渠１４へ流れ込む。このとき、図９と異なり、下水の汚物を貯溜することは避けなければならないので、通過溝部１２は半円形をなしている。
【０００４】
【発明が解決しようとする課題】
図９に示す雨水タイプのものは、下水や汚物が貯溜部１８に貯溜するので使用することができない。
【０００５】
図８に示す下水タイプのものは、下水や汚物が貯溜することがないが、急勾配管渠１３からの勢いのある下水の勢いを減ずるのが不十分で、緩勾配管渠１４への入り口部分で溢れて円滑に流れ込まなくなることがあった。
【０００６】
本発明の第１の目的は、施工性、経済性の観点からできるだけ簡易な構造の減勢装置を得ることにある。
本発明の第２の目的は、標準タイプのマンホール内に簡単に設置できる減勢装置を得ることにある。
【０００７】
【課題を解決するための手段】
本発明は、急勾配管渠１３からの水流を減勢枡本体２０内で減勢し、緩勾配管渠１４へ流し込むようにした管渠連結部の減勢装置において、前記減勢枡本体２０の底板部２４に急勾配管渠１３からの水流を分散する手段と、分散した水流を跳水現象により減勢し隙間２８から緩勾配管渠１４側へ送りこむシル部２７とを具備し、水流分散手段は、前板側管取り付け部４０の下端部からの傾斜底部２５と、この傾斜底部２５から続いて水の流れ方向に伸び、かつ、左右へ下りの傾斜部を有する分散突条部２６とで構成され、シル部２７は、中央に隙間２８を有するように、底板部２４の略中間部位置の左右に２個形成され、このシル部２７は、上流側の衝突面部２９と隙間２８を形成する側面部３３とが直立し、かつ、前記衝突面部２９は、減勢枡本体２０の側板部２３に近い側が水流を中央へ寄せるような角度を有し、中央部が水流に対して略直交していることを特徴とする管渠連結部の減勢装置である。
【０００８】
以上のような構成において、急勾配管渠１３から流れ込んできた勢いのある水流は、減勢枡本体２０の傾斜底部２５に沿ってやや広がりながら流れ落ち、この流れ落ちた水流は、分散突条部２６の両側の傾斜面と中央の水平面とで左右、中央へ十分に分散される。
左右に分散された水流は、シル部２７の衝突面部２９へ衝突し、跳水現象がおき、水流は、通常の勢いになる。
この両側で跳水現象で減勢された水流は、底板部２４の中央部に集められて隙間２８を通り下流へ送られる。この隙間２８を通り抜けた水は、通常の流れで溝部３１を通り緩勾配管渠１４へ流れ込む。
【０００９】
【発明の実施の形態】
以下、本発明の実施例を図面に基づき説明する。
図１ないし図４において、２０は、上部開口した前板部２１、後板部２２、側板部２３及び底板部２４からなる細長い箱形の減勢枡本体で、ＦＲＰにより成形されたものである。この減勢枡本体２０の前板部２１と後板部２２は、連結する急勾配管渠１３、緩勾配管渠１４の直径よりやや幅が広く、また、後述するマンホール本体３４に嵌め込むときには、マンホール本体３４の内壁と同じ弧状をなしている。このマンホール本体３４は、円形のみならず、４角形、６角形などの多角形、その他の形状の場合もあり、このような場合には、減勢枡本体２０の前板部２１と後板部２２は、弧状ではなく、直線状、その他、マンホール本体３４の内壁に合致する形状とする。
【００１０】
前記減勢枡本体２０の前板部２１には、急勾配管渠１３を嵌め込むためのＵ字形又は円形の前板側管取り付け部４０が形成され、また、前記後板部２２には、緩勾配管渠１４を嵌め込むためのＵ字形又は円形の後板側管取り付け部４１が形成されている。
前記減勢枡本体２０の底板部２４には、前記前板側管取り付け部４０の下端部から略４５度の傾斜底部２５が形成され、さらに、この傾斜底部２５から続いて水の流れ方向に伸びた分散突条部２６が形成されている。この分散突条部２６は、急勾配管渠１３からの水を左右に分散するためのもので、図４（ｃ）に示すように、中央部の幅の狭い平坦部と左右の下り傾斜部と、さらに先端部の下り傾斜部とで構成されている。この傾斜底部２５と分散突条部２６により水流分散手段が構成されている。
【００１１】
前記減勢枡本体２０の底板部２４の略中間部には、図４（ｂ）に示すように、中央に隙間２８が有するように、左右にシル部２７が形成されている。このシル部２７は、上流側の衝突面部２９と隙間２８に面した側面部３３とが直立している。このうち、衝突面部２９は、側板部２３に近い側が水流を中央へ寄せるような角度を有し、中央部が水流に対して略直交し、分散突条部２６で左右に分散された水流が衝突面部２９に衝突して跳水を生じさせて勢いを減じつつ中央へ寄せられるようになっている。
【００１２】
前記隙間２８の後方直後の拡開部３０は、図４（ａ）に示すように角形樋状をなしているが、緩勾配管渠１４の入り口に近づくにしたがって緩勾配管渠１４の内径と一致する半円形となるような溝部３１が形成され、この溝部３１の両側の斜面部３２は、溝部３１側が後板側管取り付け部４１の半径と略同じ高さで、また斜面部３２は、側板部２３側に向かって次第に高くなっている。
前記シル部２７の上面の高さは、緩勾配管渠１４の直径よりやや低い平坦部であり、この平坦部から後方へのやや下り傾斜部を経て前記斜面部３２に連続している。
【００１３】
前記減勢枡本体２０の底板部２４の下面には、マンホール本体３４への取り付けのとき、モルタル３８との結合をより強固にするためにアンカー部３５が一体に設けられる。
【００１４】
次に標準マンホールへの組み込みを説明する。
地中に設置されたマンホール本体３４の底部にモルタル３８を敷き詰め、このモルタル３８の上に減勢枡本体２０を載せる。このとき、減勢枡本体２０の前板部２１における前板側管取り付け部４０を上流側の管取り付け孔３９に臨ませ、また、後板部２２における後板側管取り付け部４１を下流側の管取り付け孔３９に臨ませる。
前記上流側の管取り付け孔３９から前板側管取り付け部４０に急勾配管渠１３の端部を差し込み、また、前記下流側の管取り付け孔３９から後板側管取り付け部４１に緩勾配管渠１４の端部を差し込み、隙間にモルタル３８を詰め込んでマンホール本体３４に、減勢枡本体２０、急勾配管渠１３、緩勾配管渠１４を固定する。さらに、減勢枡本体２０の側板部２３の外側とマンホール本体３４の内側の間にもモルタル３８を詰め込む。この側板部２３の外側とマンホール本体３４の内側の間のモルタル３８は、減勢枡本体２０から溢れたり、上方から流れ込んだ水を減勢枡本体２０へ流し込むように中央に向かって下りの傾斜面とする。
マンホール本体３４の上には、連結筒体３６が載せられ、その上面には、道路と同一高さでマンホール蓋体３７が被せられる。
【００１５】
次に、水流の勢いを減ずる作用を説明する。
急勾配管渠１３から流れ込んできた勢いのある水流は、傾斜底部２５と分散突条部２６が形成されていないと、自由落下で底板部２４の水たたき面の圧力で水脈を広げようとし、水流の広がりが不十分になる。本発明では、減勢枡本体２０の傾斜底部２５に沿ってやや広がりながら流れ落ち、この流れ落ちた水流は、分散突条部２６の両側の傾斜面と中央の水平面とで左右、中央へ十分に分散される。
【００１６】
左右に分散された水流は、両側の斜面部３２の内壁に向かって流れ、シル部２７の衝突面部２９へ衝突する。このシル部２７に衝突すると跳水現象がおき、水流は、通常の勢いになる。このとき、衝突面部２９は、側板部２３側が中央に向かって傾斜しているので、跳水の際に渦流が発生したり、汚泥が滞積したりすることなく中央へ導かれる。
この両側の跳水現象で減勢された水流と分散突条部２６の平坦部から流れ込んできた水は、底板部２４の中央部に集められて隙間２８を通り下流へ送られる。この隙間２８を通り抜けた水は、通常の流れで溝部３１を通り緩勾配管渠１４へ流れ込む。
【００１７】
なお、隙間２８の幅は、急勾配管渠１３からの沈殿物や夾雑物がつまることなく流れるためには広いことが望ましいが、両側のシル部２７が十分な跳水現象で水流の勢いが減じられる必要があり、使用目的に応じて設定される。
【００１８】
急勾配管渠１３からの水量が多すぎて隙間２８をすべて通過できない場合には、シル部２７の衝突面部２９を乗り越えて上面を流れ、溝部３１の両側の斜面部３２に流れ込み、ここで中央に寄せられて緩勾配管渠１４へ導かれる。
【００１９】
ちなみに、図７は、本発明の管渠連結部の減勢装置を用いたときの平均水位を示したもので、下側の各特性線は、計画水量を急勾配管渠１３から流し込んだときにおける減勢枡本体２０の中央の平均水位（１点鎖線）、左岸の水位（実線）、右岸の水位（点線）がすべて略同一の水位であり、減勢効果が十分表れていることを示している。
また、上側の各特性線は、計画水量の４倍を急勾配管渠１３から流し込んだときにおける減勢枡本体２０の中央の平均水位（１点鎖線）、左岸の水位（実線）、右岸の水位（点線）である。この場合、シル部２７部分で跳水が衝突面部２９を乗り越えており、水位がやや波を打っているが、計画水量の４倍でも減勢効果が十分表れていることを示している。
【００２０】
前記実施例では、減勢枡本体２０が直線状で、急勾配管渠１３と緩勾配管渠１４を１８０度対向した位置に取り付けた例を示したが、本発明は、これに限られるものではなく、図５に示すように、減勢枡本体２０を急勾配管渠１３の接続する水流入り口側４２と緩勾配管渠１４の接続する水流出口側４３をθ度だけ角度をつけてくの字状に構成したものであってもよい。また、くの字状ではなく湾曲したものであってもよい。
【００２１】
前記実施例では、減勢枡本体２０に、急勾配管渠１３と緩勾配管渠１４をそれぞれ１つずつ取り付けた例を示したが、本発明は、これに限られるものではなく、図６に示すように、減勢枡本体２０に１つの緩勾配管渠１４と２つの急勾配管渠１３を連結するための１つの水流出口側４３と、２つの水流入り口側４２ａ、４２ｂを取り付けできるようにＹ字状に形成するようにしてもよい。この場合、２つの水流入り口側４２ａ、４２ｂには、それぞれ傾斜底部２５と分散突条部２６を設け、それぞれの水流は、水流出口側４３のシル部２７直前でそれぞれの流水が合流し、減勢されるように構成する。
なお、３つ以上の水流入り口側４２と１つの水流出口側４３とを連結できるようにしてもよい。
【００２２】
【発明の効果】
本発明は、上述のように構成したので、以下の効果を有する。
（１）減勢枡本体２０の底板部２４に急勾配管渠１３からの水流を分散する手段と、分散した水流を跳水現象により減勢し隙間２８から緩勾配管渠１４側へ送りこむシル部２７とを具備しので、急勾配管渠１３からの勢いのある水流が確実に減勢されて緩勾配管渠１４へ流れ込む。
【００２３】
（２）従来、急勾配管渠１３から流れ込んできた勢いのある水流は、自由落下で枡本体の底部の水たたき面の圧力で水脈を広げようとするが、水流の広がりが不十分になる。これに対し、本発明では、水流分散手段は、前板側管取り付け部４０の下端部からの傾斜底部２５と、この傾斜底部２５から続いて水の流れ方向に伸び、かつ、左右へ下り傾斜部を有する分散突条部２６とで構成されているので、傾斜底部２５に沿ってやや広がりながら流れ落ち、この流れ落ちた水流は、分散突条部２６の両側の傾斜面で左右へ十分に分散され、左右に分散された水流は、両斜面部３２の内壁に向かって流れ、シル部２７の衝突面部２９へ衝突し、跳水現象がおき、水流は、通常の勢いになる。
【００２４】
（３）シル部２７は、中央に隙間２８を有するように、底板部２４の略中間部位置の左右に２個形成され、このシル部２７は、上流側の衝突面部２９と隙間２８を形成する側面部３３とが直立し、かつ、衝突面部２９は、減勢枡本体２０の側板部２３に近い側が水流を中央へ寄せるような角度を有し、中央部が水流に対して略直交しているので、跳水現象が確実で、しかも、下水や汚物が貯溜することがない。
【００２５】
（４）減勢枡本体２０は、ＦＲＰにより成形加工することにより施工性、経済性にすぐれた簡易な構造の減勢装置を得ることができる。
【００２６】
（５）１つの減勢枡本体２０に、２つ以上の水流入り口側４２と１つの水流出口側４３とを形成し、２つ以上の急勾配管渠１３と１つの緩勾配管渠１４とを連結することができる。
【００２７】
（６）減勢枡本体２０は、標準タイプのマンホール本体３４内に嵌合する大きさに形成し、このマンホール本体３４の底部に減勢枡本体２０を載せ、この減勢枡本体２０の前板部２１における前板側管取り付け部４０を急勾配管渠１３取り付け用の管取り付け孔３９に臨ませ、また、後板部２２における後板側管取り付け部４１を緩勾配管渠１４取り付け用の管取り付け孔３９に臨ませて固定するようにしたので、標準タイプのマンホール内に簡単に設置できる。
【図面の簡単な説明】
【図１】本発明による管渠連結部の減勢装置をマンホール本体３４に設置した状態の一実施例を示す横断平面図である。
【図２】図１における縦断面図である。
【図３】本発明による減勢枡本体２０の一実施例を示す一部切り欠いた斜視図である。
【図４】（ａ）は、図１におけるＢ−Ｂ線端面図、（ｂ）は、図１におけるＣ−Ｃ線端面図、（ｃ）は、図１におけるＤ−Ｄ線端面図である。
【図５】本発明による管渠連結部の減勢装置の他の一実施例を示す横断平面図である。
【図６】本発明による管渠連結部の減勢装置のさらに他の一実施例を示す横断平面図である。
【図７】図１に示した本発明の管渠連結部の減勢装置による平均水位の特性線を示す図である。
【図８】（ａ）は、従来の下水用インバート本体１０を示す縦断面図、（ｂ）は、（ａ）におけるＡ−Ａ線断面図である。
【図９】従来の雨水用の雨水枡１５の断面図である。
【符号の説明】
１０…インバート本体、１１…蓋体、１２…通過溝部、１３…急勾配管渠、１４…緩勾配管渠、１５…雨水枡、１６…蓋体、１７…汚泥物、１８…貯溜部、２０…減勢枡本体、２１…前板部、２２…後板部、２３…側板部、２４…底板部、２５…傾斜底部、２６…分散突条部、２７…シル部、２８…隙間、２９…衝突面部、３０…拡開部、３１…溝部、３２…斜面部、３３…側面部、３４…マンホール本体、３５…アンカー部、３６…連結筒体、３７…マンホール蓋体、３８…モルタル、３９…管取り付け孔、４０…前板側管取り付け部、４１…後板側管取り付け部、４２…水流入り口側、４３…水流出口側。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a depressurization device for a pipe linking portion that is interposed between an upstream steep pipe such as a sewer and a gentle gradient pipe downstream to reduce the momentum of the water flow.
[0002]
[Prior art]
Generally, when water having a momentum from the steep slope pipe 13 is poured into the gentle slope pipe 14, a device for reducing the momentum of the water flow is interposed at the connecting portion.
In the case of rainwater, as shown in FIG. 9, a deep rainwater tank 15 is interposed, and a steep slope pipe 13 and a gentle slope pipe 14 are connected slightly above the bottom surface of the rainwater tank 15 for storage. Part 18 is assumed. The water with the momentum from the steep slope pipe 13 falls into the stored water in the reservoir 18 to reduce the momentum, and flows into the gentle slope pipe 14. The reservoir 18 stores sludge 17 such as mud, pebbles, and garbage that has flowed with the water from the steep slope tube 13. And sometimes, the lid body 16 is taken to remove the sludge 17.
[0003]
On the other hand, in the case of sewage, as shown in FIGS. 8 (a) and 8 (b), an invert body 10 having a shallow depth is interposed, and between the steep slope pipe 13 and the gentle slope pipe 14 is provided. The passage groove portion 12 is formed and the upper surface is covered with the lid body 11. The vigorous sewage from the steep slope pipe 13 flows into the gentle slope pipe 14 through the passage groove portion 12. At this time, unlike FIG. 9, it is necessary to avoid storing sewage filth, so that the passage groove 12 has a semicircular shape.
[0004]
[Problems to be solved by the invention]
The rainwater type shown in FIG. 9 cannot be used because sewage and filth accumulate in the reservoir 18.
[0005]
The sewage type shown in FIG. 8 does not accumulate sewage or filth, but it is insufficient to reduce the momentum of the sewage from the steep slope 13 and the entrance to the gentle slope 14 There were times when it overflowed in the part and could not flow smoothly.
[0006]
A first object of the present invention is to obtain a de-energizing device having a structure as simple as possible from the viewpoint of workability and economy.
A second object of the present invention is to provide a de-energizing device that can be easily installed in a standard type manhole.
[0007]
[Means for Solving the Problems]
The present invention relates to a pressure reducing device for a pipe rod connecting portion in which the water flow from the steeply graded pipe rod 13 is reduced in the reduced pressure rod main body 20 and flows into the gentle gradient pipe rod 14. Means for dispersing the water flow from the steep slope pipe 13 on the bottom plate portion 24 of the steel plate, and a sill portion 27 for decelerating the dispersed water flow by a jumping phenomenon and feeding it from the gap 28 toward the gentle slope pipe 14 side. The means includes an inclined bottom portion 25 from the lower end portion of the front plate side pipe mounting portion 40, a dispersion ridge portion 26 that extends from the inclined bottom portion 25 in the direction of water flow and has an inclined portion that descends to the left and right. The two sill portions 27 are formed on the left and right sides of the substantially middle portion of the bottom plate portion 24 so as to have a gap 28 in the center. The sill portion 27 has a clearance 28 and a clearance 28 on the upstream side. The side surface portion 33 to be formed is upright, and the collision surface portion 29 is reduced. Has an angle that the side close to the side plate portion 23 of the square body 20 gather the water flow to the center, the central portion is de-energized device Kanmizo connecting portion, characterized in that it is substantially perpendicular to the water flow.
[0008]
In the configuration as described above, the vigorous water flow that has flowed in from the steeply inclined pipe rod 13 flows down while slightly spreading along the inclined bottom portion 25 of the depressurizing rod main body 20, and the water flow that has flowed down is distributed to the dispersing ridge portion 26. The left and right slant surfaces and the central horizontal plane are sufficiently distributed from side to side and center.
The water flow dispersed to the left and right collides with the collision surface portion 29 of the sill portion 27, causing a water jump phenomenon, and the water flow has a normal momentum.
The water flow reduced by the water jump phenomenon on both sides is collected in the central portion of the bottom plate portion 24 and sent downstream through the gap 28. The water that has passed through the gap 28 flows into the gentle gradient pipe rod 14 through the groove portion 31 in a normal flow.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
1 to 4, reference numeral 20 denotes an elongated box-shaped de-energizing rod main body comprising a front plate portion 21, a rear plate portion 22, a side plate portion 23, and a bottom plate portion 24 having an upper opening, which is formed by FRP. . The front plate portion 21 and the rear plate portion 22 of the depressurizing rod main body 20 are slightly wider than the diameters of the steep slope tube 13 and the gentle gradient tube rod 14 to be connected, and when fitted into the manhole body 34 described later. The same arc shape as the inner wall of the manhole body 34 is formed. The manhole body 34 may be not only circular, but also polygonal, such as quadrangular and hexagonal, and other shapes. In such a case, the front plate portion 21 and the rear plate portion of the force reducing rod main body 20 are used. 22 is not an arc, but a straight line, or any other shape that matches the inner wall of the manhole body 34.
[0010]
A U-shaped or circular front plate side pipe mounting portion 40 for fitting the steep slope tube rod 13 is formed on the front plate portion 21 of the depressurizing rod main body 20, and the rear plate portion 22 includes A U-shaped or circular rear plate side pipe mounting portion 41 for fitting the gentle gradient pipe rod 14 is formed.
The bottom plate portion 24 of the depressurizing rod main body 20 is formed with an inclined bottom portion 25 of approximately 45 degrees from the lower end portion of the front plate side pipe mounting portion 40, and further from the inclined bottom portion 25 in the direction of water flow. Elongated dispersion ridges 26 are formed. This dispersion protrusion 26 is for dispersing water from the steep slope pipe 13 to the left and right, and as shown in FIG. 4 (c), a narrow flat part at the center and a left and right downward inclined part. And a downwardly inclined portion at the tip. The inclined bottom portion 25 and the dispersion ridge portion 26 constitute water flow dispersion means.
[0011]
As shown in FIG. 4B, sill portions 27 are formed on the left and right sides of the bottom plate portion 24 of the depressing rod main body 20 so that a gap 28 is provided at the center. In the sill portion 27, an upstream collision surface portion 29 and a side surface portion 33 facing the gap 28 stand upright. Of these, the collision surface portion 29 has an angle such that the side close to the side plate portion 23 brings the water flow toward the center, the central portion is substantially orthogonal to the water flow, and the water flow dispersed left and right by the dispersion protrusion 26 is It collides with the collision surface portion 29 to cause a water jump, and can be brought to the center while reducing the momentum.
[0012]
The widened portion 30 immediately after the gap 28 has a square hook shape as shown in FIG. 4 (a), but the inner diameter of the gentle gradient pipe rod 14 is increased toward the entrance of the gentle gradient pipe rod 14. A groove portion 31 is formed so as to have a matching semicircular shape, and the slope portions 32 on both sides of the groove portion 31 are substantially the same height as the radius of the rear plate side pipe mounting portion 41 on the groove portion 31 side. It gradually becomes higher toward the side plate portion 23 side.
The height of the upper surface of the sill portion 27 is a flat portion that is slightly lower than the diameter of the gentle gradient tube 14, and continues to the inclined surface portion 32 through a slightly downward inclined portion from the flat portion to the rear.
[0013]
An anchor portion 35 is integrally provided on the lower surface of the bottom plate portion 24 of the depressurizing rod main body 20 in order to strengthen the coupling with the mortar 38 when the manhole body 34 is attached.
[0014]
Next, the incorporation into the standard manhole will be explained.
A mortar 38 is laid on the bottom of the manhole body 34 installed in the ground, and the de-energizing body 20 is placed on the mortar 38. At this time, the front plate side tube mounting portion 40 in the front plate portion 21 of the force reducing rod main body 20 faces the upstream side tube mounting hole 39, and the rear plate side tube mounting portion 41 in the rear plate portion 22 is set downstream. It faces the tube mounting hole 39.
The end portion of the steep slope tube rod 13 is inserted into the front plate side tube attachment portion 40 from the upstream side tube attachment hole 39, and the gentle gradient tube is connected from the downstream side tube attachment hole 39 to the rear plate side tube attachment portion 41. The end portion of the ridge 14 is inserted, and the mortar 38 is filled in the gap, and the depressurized ridge body 20, the steep gradient tube ridge 13, and the gentle gradient tube ridge 14 are fixed to the manhole body 34. Furthermore, the mortar 38 is also packed between the outside of the side plate portion 23 of the depressing rod main body 20 and the inside of the manhole body 34. The mortar 38 between the outside of the side plate portion 23 and the inside of the manhole body 34 is inclined downward toward the center so that the water flowing from the upper side of the depressurizing rod main body 20 or flowing from the upper side flows into the depressing rod main body 20. A surface.
A connecting cylinder 36 is placed on the manhole body 34, and a manhole cover 37 is placed on the upper surface of the connecting cylinder 36 at the same height as the road.
[0015]
Next, the effect | action which reduces the momentum of a water flow is demonstrated.
If the inclined bottom portion 25 and the dispersion ridge portion 26 are not formed, the vigorous water flow that has flowed from the steep slope tube 13 tries to spread the water vein by the pressure of the water hitting surface of the bottom plate portion 24 by free fall, The spread of water flow becomes insufficient. In the present invention, the water flows down while spreading slightly along the inclined bottom portion 25 of the power reducing rod main body 20, and the water flow that has flowed down is sufficiently distributed to the left and right and the center by the inclined surfaces on both sides of the dispersing protrusion 26 and the central horizontal plane. Is done.
[0016]
The water flow dispersed left and right flows toward the inner walls of the slope portions 32 on both sides, and collides with the collision surface portion 29 of the sill portion 27. When it collides with the sill portion 27, a water jump phenomenon occurs, and the water flow has a normal momentum. At this time, since the side face part 23 side is inclined toward the center, the collision surface part 29 is guided to the center without causing vortex or sludge accumulation during the water jump.
The water flow reduced by the water jump phenomenon on both sides and the water flowing from the flat portion of the dispersion ridge portion 26 are collected at the central portion of the bottom plate portion 24 and sent downstream through the gap 28. The water that has passed through the gap 28 flows into the gentle gradient pipe rod 14 through the groove portion 31 in a normal flow.
[0017]
The width of the gap 28 is preferably wide so that the sediment and impurities from the steep pipe 13 can flow without clogging, but the sill portions 27 on both sides reduce the momentum of the water flow due to sufficient jumping phenomenon. It is necessary to be set according to the purpose of use.
[0018]
When there is too much water from the steep slope tube 13 so that it cannot pass through all the gaps 28, it passes over the collision surface portion 29 of the sill portion 27, flows over the upper surface, and flows into the slope portions 32 on both sides of the groove portion 31. And is led to the gentle gradient tube rod 14.
[0019]
By the way, FIG. 7 shows the average water level when using the depressurization device of the pipe joint connecting portion of the present invention, and each characteristic line on the lower side shows when the planned water volume is poured from the steep slope pipe 13. The average water level (one-dot chain line), the left bank water level (solid line), and the right bank water level (dotted line) in the center of the de-energized water main body 20 are almost the same water level, indicating that the de-energizing effect is fully expressed. ing.
The upper characteristic lines indicate the average water level (one-dot chain line), the water level on the left bank (solid line), the right bank on the right bank, when four times the planned water flow from the steep slope pipe 13 Water level (dotted line). In this case, the water jumping over the collision surface portion 29 in the sill portion 27 and the water level is slightly undulating, but it shows that the de-energizing effect is sufficiently exhibited even four times the planned water amount.
[0020]
In the above-described embodiment, the example in which the depressurizing rod main body 20 is linear and the steeply inclined tube rod 13 and the gentle gradient tube rod 14 are attached at positions opposed to each other by 180 degrees is shown, but the present invention is limited to this. Instead, as shown in FIG. 5, the water flow inlet side 42 to which the steep slope pipe 13 is connected and the water outlet side 43 to which the gentle slope pipe 14 is connected are angled by θ degrees as shown in FIG. It may be configured in a letter shape. Further, it may be curved instead of the letter-shaped shape.
[0021]
In the above-described embodiment, an example is shown in which one steep slope pipe 13 and one gentle slope pipe 14 are attached to the depressurizing saddle body 20, but the present invention is not limited to this. As shown in FIG. 2, one water outlet side 43 for connecting one gentle gradient pipe rod 14 and two steep slope pipe rods 13 to the depressurizing rod main body 20 and two water flow inlet sides 42a and 42b can be attached. Thus, it may be formed in a Y shape. In this case, the two water flow inlet sides 42a and 42b are respectively provided with an inclined bottom portion 25 and a dispersion ridge portion 26, and the respective water flows merge with each other immediately before the sill portion 27 on the water flow outlet side 43, and are reduced. It is configured to be supported.
Note that three or more water inlet sides 42 and one water outlet side 43 may be connected.
[0022]
【The invention's effect】
Since this invention was comprised as mentioned above, it has the following effects.
(1) Means for dispersing the water flow from the steep slope tube 13 to the bottom plate portion 24 of the reduced force rod main body 20 and a sill portion for reducing the dispersed water flow by a jumping phenomenon and sending it from the gap 28 toward the gentle gradient tube rod 14 side. 27, the vigorous water flow from the steep slope pipe 13 is surely reduced and flows into the gentle slope pipe 14.
[0023]
(2) Conventionally, the strong water flow that has flowed in from the steep pipe tube 13 tries to spread the water vein by the pressure of the surface of the bottom of the rod body by free fall, but the spread of the water flow becomes insufficient . On the other hand, according to the present invention, the water flow dispersing means includes an inclined bottom portion 25 from the lower end portion of the front plate side pipe mounting portion 40, and extends from the inclined bottom portion 25 in the direction of water flow and is inclined downward to the left and right. Since it is composed of the distributed ridge portion 26 having a portion, it flows down while spreading slightly along the inclined bottom portion 25, and the water flow that has flowed down is sufficiently dispersed right and left on the inclined surfaces on both sides of the distributed ridge portion 26. The water flow dispersed to the left and right flows toward the inner walls of both slope portions 32 and collides with the collision surface portion 29 of the sill portion 27, causing a water jump phenomenon, and the water flow has a normal momentum.
[0024]
(3) Two sill portions 27 are formed on the left and right of the substantially middle position of the bottom plate portion 24 so as to have a gap 28 in the center. The sill portion 27 forms a gap 28 with the collision surface portion 29 on the upstream side. The side surface portion 33 that stands upright, and the collision surface portion 29 has an angle such that the side close to the side plate portion 23 of the power reducing rod body 20 brings the water flow toward the center, and the center portion is substantially orthogonal to the water flow. As a result, the water jump phenomenon is sure and sewage and filth are not stored.
[0025]
(4) The depressurizing rod main body 20 can be obtained by forming with a FRP a simple structure depressing device having excellent workability and economy.
[0026]
(5) Two or more water flow inlet sides 42 and one water flow outlet side 43 are formed in one depressurizing rod main body 20, and two or more steep slope tubes 13 and one gentle gradient tube 14 are provided. Can be connected.
[0027]
(6) The depressurizing rod main body 20 is formed in a size that fits into a standard type manhole main body 34, and the depressurizing rod main body 20 is placed on the bottom of the manhole main body 34. The front plate side pipe mounting portion 40 in the plate portion 21 faces the pipe mounting hole 39 for mounting the steep slope tube rod 13, and the rear plate side pipe mounting portion 41 in the rear plate portion 22 is used for mounting the gentle gradient tube rod 14. Since it is fixed so as to face the tube mounting hole 39, it can be easily installed in a standard type manhole.
[Brief description of the drawings]
FIG. 1 is a cross-sectional plan view showing an embodiment of a state in which a depressurization device for a pipe rod connecting portion according to the present invention is installed in a manhole body 34;
FIG. 2 is a longitudinal sectional view in FIG.
FIG. 3 is a partially cutaway perspective view showing an embodiment of a depressurizing rod main body 20 according to the present invention.
4A is an end view taken along line BB in FIG. 1, FIG. 4B is an end view taken along line CC in FIG. 1, and FIG. 4C is an end view taken along line DD in FIG. .
FIG. 5 is a cross-sectional plan view showing another embodiment of the device for reducing the urn of the tube hook connection portion according to the present invention.
FIG. 6 is a cross-sectional plan view showing still another embodiment of the device for reducing a tub coupling portion according to the present invention.
FIG. 7 is a diagram showing a characteristic line of an average water level by the depressurization device for the pipe sill coupling portion of the present invention shown in FIG.
8A is a longitudinal sectional view showing a conventional sewage invert main body 10, and FIG. 8B is a sectional view taken along line AA in FIG. 8A.
FIG. 9 is a cross-sectional view of a conventional rainwater tank 15 for rainwater.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Invert main body, 11 ... Cover body, 12 ... Passing groove part, 13 ... Steep slope pipe tank, 14 ... Slow gradient pipe tank, 15 ... Rain water tank, 16 ... Cover body, 17 ... Sludge, 18 ... Reservoir part, 20 DESCRIPTION OF SYMBOLS ... Deceleration rod main body, 21 ... Front plate part, 22 ... Rear plate part, 23 ... Side plate part, 24 ... Bottom plate part, 25 ... Inclined bottom part, 26 ... Dispersion ridge part, 27 ... Sill part, 28 ... Gap, 29 ... Colliding surface part, 30 ... Expanding part, 31 ... Groove part, 32 ... Slope part, 33 ... Side face part, 34 ... Manhole body, 35 ... Anchor part, 36 ... Connecting cylinder, 37 ... Manhole cover, 38 ... Mortar, 39 ... Tube attachment hole, 40 ... Front plate side tube attachment portion, 41 ... Rear plate side tube attachment portion, 42 ... Water flow inlet side, 43 ... Water flow outlet side.

Claims

The water flow from the steep slope pipe 13 connected to the front plate side pipe mounting portion 40 of the depressurizing rod main body 20 is reduced in the derating rod main body 20, and the In the apparatus for reducing the pressure at the pipe connecting portion, which flows into the connected slow gradient pipe rod 14, means for dispersing the water flow from the steep slope pipe 13 on the bottom plate portion 24 of the depressing rod main body 20, and the dispersed water flow And a sill portion 27 that depressurizes due to a water jump phenomenon and feeds it from the gap 28 toward the gently-gradient ram 14 side.

The depressing rod main body 20 is formed in an elongated box shape having an open top surface, the front plate side pipe mounting portion 40 is disposed on the front plate portion 21 of the depressurizing rod main body 20, the water inlet side 42 is disposed on the rear plate portion 22, and the bottom plate portion. 24. The apparatus for reducing a pipe rod connection portion according to claim 1, wherein a water flow dispersion means and a sill portion with a gap are provided in each of the two.

The water flow dispersing means includes a sloped bottom portion 25 from the lower end of the front plate side pipe mounting portion 40, and a dispersion ridge portion extending from the sloped bottom portion 25 in the direction of water flow and having a sloped portion descending to the left and right. 26. The apparatus of claim 1 or 2, wherein the device for reducing the pressure of the pipe rim connection portion.

Two sill portions 27 are formed on the left and right sides of the substantially middle position of the bottom plate portion 24 so as to have a gap 28 in the center. The sill portions 27 are side portions that form a clearance 28 with the collision surface portion 29 on the upstream side. 33 and the collision surface portion 29 has an angle such that the side close to the side plate portion 23 of the force reducing rod body 20 brings the water flow toward the center, and the central portion is substantially orthogonal to the water flow. 4. A device for reducing the urn of the pipe joint according to claim 1, 2, or 3.

5. The apparatus for reducing the pressure of a pipe rod connection portion according to claim 1, wherein the pressure reduction rod main body is molded by FRP.

The flow path between the water flow inlet side 42 and the water flow outlet side 43 in the depressurizing rod main body 20 is formed in a straight line, a curved shape or a predetermined angle, and the steep slope pipe 13 and the gentle slope pipe 14 are linear with each other. Alternatively, the device for reducing a pipe rod connection portion according to claim 1, wherein the device can be connected at a predetermined angle.

Two or more water flow inlet sides 42 and one water flow outlet side 43 can be formed in one depressurizing rod main body 20 to connect two or more steep slope tubes 13 and one gentle gradient tube rod 14. 7. The apparatus for reducing the urn of the tube rim connection part according to claim 1, wherein the device for reducing the ligament connection part according to claim 1 is used.

The depressurizing rod main body 20 is formed in a size that fits into a standard type manhole main body 34, the depressing rod main body 20 is placed on the bottom of the manhole main body 34, and the front plate portion 21 of the depressurizing rod main body 20. The front plate side pipe mounting portion 40 in FIG. 1 faces the pipe mounting hole 39 for mounting the steep slope tube rod 13, and the rear plate side pipe mounting portion 41 in the rear plate portion 22 is mounted on the pipe for mounting the gentle gradient tube rod 14. 8. The device for reducing a flange connection portion according to claim 1, wherein the device is fixed so as to face the hole 39.