JP6267592B2 - Drainage structure and catchment - Google Patents

Drainage structure and catchment Download PDF

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JP6267592B2
JP6267592B2 JP2014126718A JP2014126718A JP6267592B2 JP 6267592 B2 JP6267592 B2 JP 6267592B2 JP 2014126718 A JP2014126718 A JP 2014126718A JP 2014126718 A JP2014126718 A JP 2014126718A JP 6267592 B2 JP6267592 B2 JP 6267592B2
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slope
drainage
groove
drainage groove
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JP2016003548A (en
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政司 永田
政司 永田
一頼 藤岡
一頼 藤岡
雅男 篠田
雅男 篠田
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東日本高速道路株式会社
中日本高速道路株式会社
西日本高速道路株式会社
株式会社高速道路総合技術研究所
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Description

本発明は、小段が設けられた法面に敷設される排水構造に関する。   The present invention relates to a drainage structure laid on a slope provided with a step.

一般に、切土、盛土等によって法面を形成する場合、崩落防止のために、法面の途中に小段が設けられる。このような小段が設けられた法面に敷設される排水構造として、特許文献１に記載の法面小段における排水構造がある。この排水構造は、法面の傾斜と略同じ勾配で法面の傾斜方向に沿って法面に敷設された上流側および下流側の縦排水溝（縦排水フリューム）と、小段を深く掘り下げることなく、小段の長さ方向に沿って小段上に載置された小段排水溝（小段排水フリューム）と、上流側の縦排水溝および小段排水溝の合流部分に配置された集水桝（縦排水桝）と、集水桝および下流側の縦排水溝間に敷設された調整溝（調整フリューム）と、を備えている。   Generally, when a slope is formed by cutting, embankment or the like, a step is provided in the middle of the slope to prevent collapse. As a drainage structure laid on the slope provided with such a small step, there is a drainage structure in the slope step described in Patent Document 1. This drainage structure has a vertical drainage channel (vertical drainage flume) laid on the slope along the slope of the slope with almost the same slope as the slope of the slope, and without digging deep into the steps. , A drainage basin (vertical drainage basin) arranged at the confluence of the small drainage groove (small drainage flume) placed on the small stage along the length direction of the small stage and the upstream vertical drainage groove and the small drainage groove ) And an adjustment groove (adjustment flume) laid between the water collecting tank and the downstream vertical drainage groove.

このような排水構造において、上流側の縦排水溝および左右両側の小段排水溝を流れる雨水等は、集水桝に集水され、その後、調整溝を介して下流側の縦排水溝へ排水される。   In such a drainage structure, rainwater and the like flowing through the upstream vertical drainage channel and the left and right small drainage channels are collected in a catchment basin and then drained to the downstream vertical drainage channel via the adjustment channel. The

特開平８−０８５９５６号公報JP-A-8-089556

特許文献１に記載の法面小段における排水構造において、集水桝は小段に埋設され、上流側の縦排水溝および左右両側の小段排水溝は、これらの排水溝を流れる雨水等が集水桝の上面に流入するように設置されている。また、調整溝は、小段に沿って敷設され、一方の端部が集水桝の下流側の側壁上部に連結され、他方の端部が小段と下流側の法面との境界において下流側の縦排水溝に連結されている。このため、例えばゲリラ豪雨等により大量の雨水等が発生した場合に、次のような問題が生じていた。   In the drainage structure in the slope step described in Patent Document 1, the catchment basin is buried in the step, and the upstream vertical drainage groove and the left and right side drainage trenches have rainwater flowing through these drainage grooves. It is installed so as to flow into the upper surface. In addition, the adjustment groove is laid along the small step, one end is connected to the upper side wall on the downstream side of the catchment basin, and the other end is on the downstream side at the boundary between the small step and the downstream slope. It is connected to the vertical drain. For this reason, for example, when a large amount of rainwater or the like is generated by guerrilla heavy rain or the like, the following problems have occurred.

すなわち、上流側の縦排水溝および左右両側の小段排水溝から集水桝の上面に急激に流れ込む雨水等が、集水桝の桝底領域まで届かずに水面領域で合流するため、大量の雨水等の水流が、その勢いを増して調整溝に排水される。このため、調整溝を流れる雨水等の水流が、勢いを保ったまま、調整溝と下流側の縦排水溝との連結部から飛び出して溢水する可能性がある。また、集水桝から調整溝へ排水可能な水量が上流側の縦排水溝および左右両側の小段排水溝から集水桝へ流入可能な水量に比べて小さく、このため、集水桝の水位が上昇して集水桝から溢れ出る可能性もある。   In other words, rainwater that suddenly flows into the upper surface of the drainage basin from the vertical drainage channel on the upstream side and the small drainage basins on the left and right sides does not reach the bottom of the drainage basin, but merges in the surface area. Such a water stream increases its momentum and drains into the adjustment groove. For this reason, there is a possibility that a water flow such as rainwater flowing through the adjustment groove jumps out of the connecting portion between the adjustment groove and the downstream vertical drainage groove while maintaining momentum. In addition, the amount of water that can be drained from the catchment basin to the adjustment channel is small compared to the amount of water that can flow into the drainage basin from the upstream drainage channel on the upstream side and the left and right side drainage channels. There is a possibility that it will rise and overflow from the catchment basin.

本発明は上記事情に鑑みてなされたものであり、その目的は、縦排水溝および小段排水溝の合流部分における溢水を効果的に防止できる排水構造および集水桝を提供することにある。   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a drainage structure and a drainage basin that can effectively prevent overflow at the junction of the vertical drainage grooves and the small drainage grooves.

上記課題を解決するために、本発明では、縦排水溝と小段排水溝との合流部分に配置され、上流側の縦排水溝および小段排水溝からの流入水を下流側の縦排水溝に排水する集水桝において、桝底を、小段と下流側の法面との境界を超える位置まで延ばして、下流側の縦排水溝の溝底に連結させた。また、上流側の縦排水溝の両側壁の頂面を集水桝の天端に連結させるとともに、上流側の縦排水溝の溝底を、法面の傾斜に沿った勾配を維持させたまま、集水桝の側壁に連結させた。   In order to solve the above problems, in the present invention, the inflowing water from the upstream vertical drainage groove and the small drainage groove is drained to the downstream vertical drainage groove, which is arranged at the junction of the vertical drainage groove and the small drainage groove. In the drainage basin, the bottom of the basin was extended to a position exceeding the boundary between the small step and the slope on the downstream side and connected to the bottom of the vertical drainage groove on the downstream side. In addition, the top surfaces of both side walls of the upstream vertical drainage ditch are connected to the top of the catchment basin, and the groove bottom of the upstream vertical drainage ditch is maintained with a gradient along the slope of the slope. And connected to the side wall of the catchment basin.

例えば、本発明の排水構造は、
小段が設けられた法面に敷設される排水構造であって、
前記法面に、当該法面の傾斜に沿った勾配で当該法面の傾斜方向に敷設された上流側および下流側の縦排水溝と、
前記小段に、当該小段の長さ方向に敷設された小段排水溝と、
前記上流側の縦排水溝と前記小段排水溝との合流部分に配置され、前記上流側の縦排水溝および前記小段排水溝から、桝底および桝側壁に囲まれた桝内への流入水を、前記下流側の縦排水溝に排水する集水桝と、を備え、
前記上流側の縦排水溝の両側壁の頂面は、前記集水桝の天端に連結し、
前記上流側の縦排水溝の溝底は、前記法面の傾斜に沿った勾配を維持したまま、前記桝側壁のうち、前記小段と上流側の前記法面との境界側に位置する第一の桝側壁に連結しており、
前記桝底は、前記上流側の縦排水溝の溝底よりも低い位置において、前記第一の桝側壁から下流側の前記法面まで水平に設けられて、前記下流側の縦排水溝の溝底に連結し、前記桝側壁のうち、前記第一の桝側壁の両側を挟むように対向して配置された第二および第三の桝側壁は、前記小段と下流側の前記法面との境界側から、前記桝底と前記下流側の縦排水溝の溝底との連結位置に向かうに従って間隔が狭くなり、前記下流側の縦排水溝の側壁に連結している。 For example, the drainage structure of the present invention is
A drainage structure laid on a slope with a step,
On the slope, upstream and downstream longitudinal drainage grooves laid in the slope direction of the slope with a slope along the slope of the slope,
A small drainage groove laid in the length direction of the small step in the small step,
The inflow water is disposed at the confluence of the upstream vertical drainage groove and the small drainage groove , and the inflow water from the upstream vertical drainage groove and the small drainage groove into the tub surrounded by the dredge bottom and the dredging side wall. A drainage basin for draining into the downstream vertical drainage channel ,
The top surface of both side walls of the longitudinal drainage ditch before Symbol upstream, coupled on the top end of the water collecting basins,
The groove bottom of the upstream vertical drainage groove is a first located on the boundary side between the small step and the upstream slope on the side wall while maintaining the slope along the slope of the slope . of it has been linked to the basins side wall,
The trough bottom is provided horizontally from the first trough side wall to the slope on the downstream side at a position lower than the bottom of the upstream longitudinal drainage groove, and the downstream vertical drainage groove A second side wall and a third side wall connected to each other so as to sandwich both sides of the first side wall among the side walls; From the boundary side, the distance becomes narrower toward the connection position between the dredged bottom and the groove bottom of the downstream vertical drainage groove, and the gap is connected to the side wall of the downstream vertical drainage groove .

また、本発明の集水桝は、
法面に、当該法面の傾斜に沿った勾配で当該法面の傾斜方向に敷設された上流側および下流側の縦排水溝と、小段に、当該小段の長さ方向に敷設された小段排水溝との合流部分に配置され、前記上流側の縦排水溝および前記小段排水溝からの流入水を前記下流側の縦排水溝に排水する集水桝であって、
桝底と前記桝底の周りを囲む桝側壁と、を有し、
前記桝側壁は、
前記小段と上流側の前記法面との境界側に配置されており、前記上流側の縦排水溝の両側壁の頂面が天端に連結され、前記上流側の縦排水溝の溝底が前記法面の傾斜に沿った勾配を維持したまま前記桝底よりも高い位置で連結された第一の桝側壁と、
前記第一の桝側壁の両側を挟むように対向して配置された第二および第三の桝側壁と、を含み、
前記桝底は、前記上流側の縦排水溝の溝底よりも低い位置において、前記第一の桝側壁から下流側の前記法面まで水平に設けられて、前記下流側の縦排水溝の溝底に連結されており、
前記第二および第三の側壁は、
前記小段と下流側の前記法面との境界側から、前記下流側の縦排水溝の溝底と前記桝底との連結位置に向かうに従って間隔が狭くなり、前記下流側の縦排水溝の両側壁に連結している。 In addition, the water collecting tank of the present invention is
On the slope, an upstream and downstream longitudinal drainage channel laid in the slope direction of the slope with a slope along the slope of the slope, and a small stage drainage laid in the length direction of the stage. A drainage basin that is disposed at a junction with a groove and drains inflow water from the upstream vertical drainage groove and the small drainage groove to the downstream vertical drainage groove,
A heel bottom and a heel side wall surrounding the heel bottom;
The heel side wall
It is arranged on the boundary side between the small step and the slope on the upstream side, the top surfaces of both side walls of the upstream vertical drainage groove are connected to the top end, and the groove bottom of the upstream vertical drainage groove is A first side wall connected at a position higher than the bottom while maintaining a slope along the slope of the slope;
And second and third heel side walls arranged to face each other on both sides of the first heel side wall,
The trough bottom is provided horizontally from the first trough side wall to the slope on the downstream side at a position lower than the bottom of the upstream longitudinal drainage groove, and the downstream vertical drainage groove Connected to the bottom ,
The second and third sidewalls are
From the boundary side between the small stage and the slope on the downstream side, the interval becomes narrower toward the connecting position between the bottom of the vertical drainage groove on the downstream side and the bottom of the trough, and both sides of the downstream drainage groove on the downstream side Connected to the wall .

本発明では、上流側の縦排水溝の両側壁の頂面が集水桝の天端に連結し、かつ上流側の縦排水溝の溝底が、法面の傾斜に沿った勾配を維持したまま、集水桝の上流側の側壁に連結しているので、上流側の縦排水溝からの流入水が、法面の傾斜に沿った角度で集水桝の側面へ投入され、これにより、上流側の縦排水溝からの流入水を集水桝の桝底領域へ効率よく送り込むことができる。また、集水桝の桝底が、下流側の縦排水溝の溝底に連結しているので、集水桝の水面領域から桝底領域までの全域を下流側の縦排水溝への排水断面として利用することができる。   In the present invention, the top surfaces of both side walls of the upstream vertical drainage groove are connected to the top end of the catchment basin, and the groove bottom of the upstream vertical drainage groove maintains a gradient along the slope of the slope. As it is connected to the side wall on the upstream side of the catchment basin, the inflow water from the vertical drainage channel on the upstream side is poured into the side surface of the catchment basin at an angle along the slope of the slope, Inflow water from the vertical drainage channel on the upstream side can be efficiently fed into the bottom area of the catchment basin. In addition, since the bottom of the catchment basin is connected to the bottom of the vertical drainage channel on the downstream side, the entire area from the surface area of the catchment basin to the bottom of the basin is drained to the vertical drainage channel on the downstream side. Can be used as

このため、集水桝の流下能力が向上し、集水桝から排水される雨水等の流速が水面領域において過剰に速くなるのを防止でき、これにより、小段と下流側の法面との境界において、流水が集水桝から勢いよく飛び出してしまうのを防止できる。また、集水桝の流下能力の向上により、集水桝の水位が上昇して集水桝から雨水等が溢れ出るのを防止できる。したがって、本発明によれば、縦排水溝および小段排水溝の合流部分における溢水を効果的に防止することができる。   For this reason, the drainage capacity of the catchment can be improved, and the flow rate of rainwater drained from the catchment can be prevented from becoming excessively high in the water surface area, which makes it possible to prevent the boundary between the steps and the downstream slope. In this case, it is possible to prevent the running water from jumping out of the catchment basin. In addition, by improving the drainage capacity of the catchment, it is possible to prevent the rainwater from overflowing from the catchment by raising the water level of the catchment. Therefore, according to this invention, the overflow in the junction part of a vertical drain ditch and a small stage drain ditch can be prevented effectively.

図１は、本発明の一実施の形態に係る排水構造１の斜視図である。FIG. 1 is a perspective view of a drainage structure 1 according to an embodiment of the present invention. 図２は、排水構造１の平面図である。FIG. 2 is a plan view of the drainage structure 1. 図３は、排水構造１の正面図である。FIG. 3 is a front view of the drainage structure 1. 図４は、図２に示す排水構造１のＡ−Ａ矢視断面図である。FIG. 4 is a cross-sectional view of the drainage structure 1 shown in FIG. 図５は、図２に示す排水構造１のＢ−Ｂ矢視断面図である。5 is a cross-sectional view of the drainage structure 1 shown in FIG. 図６は、図３に示す排水構造１のＣ−Ｃ矢視断面図である。FIG. 6 is a cross-sectional view of the drainage structure 1 shown in FIG.

以下、本発明の一実施の形態について図面を参照して説明する。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

図１〜図３は、本実施の形態に係る排水構造１の斜視図、平面図、および正面図である。また、図４および図５は、図２に示す排水構造１のＡ−Ａ矢視断面図、Ｂ−Ｂ矢視断面図であり、図６は、図３に示す排水構造１のＣ−Ｃ矢視断面図である。   1 to 3 are a perspective view, a plan view, and a front view of the drainage structure 1 according to the present embodiment. 4 and 5 are cross-sectional views taken along arrows AA and BB of the drainage structure 1 shown in FIG. 2, and FIG. 6 is a cross-sectional view taken along the line C-C of the drainage structure 1 shown in FIG. It is arrow sectional drawing.

本実施の形態に係る排水構造１は、小段７が設けられた法面６ａ、６ｂ（以下、単に法面６とも呼ぶ）に敷設され、法面６を流れる雨水等を下流側へ排水する。   The drainage structure 1 according to the present embodiment is laid on slopes 6a and 6b (hereinafter also simply referred to as slopes 6) provided with small steps 7, and drains rainwater and the like flowing through the slope 6 to the downstream side.

図示するように、排水構造１は、法面６に敷設される縦排水溝２ａ、２ｂ（以下、単に縦排水溝２とも呼ぶ）と、小段７に敷設される小段排水溝３ａ、３ｂ（以下、単に小段排水溝３とも呼ぶ）と、縦排水溝２と小段排水溝３との合流部分に配置され、縦排水溝２と小段排水溝３が接続される集水桝４と、集水桝４の桝底４２に配置された減勢工５と、を備えている。   As shown in the drawing, the drainage structure 1 includes vertical drainage grooves 2a and 2b (hereinafter also simply referred to as vertical drainage grooves 2) laid on the slope 6 and small drainage grooves 3a and 3b (hereinafter referred to as vertical drainage grooves 2). , Simply referred to as a small drainage groove 3), a drainage trough 4 disposed at the junction of the vertical drainage groove 2 and the small drainage groove 3, and to which the vertical drainage groove 2 and the small drainage groove 3 are connected, 4 and a depressurizer 5 disposed on the bottom 42 of the bottom.

縦排水溝２は、法面６の傾斜に沿った勾配で法面６の傾斜方向Ｙに敷設される。ここで、上流側の縦排水溝２ａの両側壁２０の頂面２１は集水桝４の天端４０に連結し、上流側の縦排水溝２ａの溝底２２ａは、法面６の傾斜に沿った勾配を維持したまま、集水桝４の桝底４２よりも高い位置において集水桝４の上流側の側壁４１ａに連結している。また、下流側の縦排水溝２ｂの溝底２２ｂは、集水桝４の桝底４２に連結している。   The vertical drainage groove 2 is laid in the inclination direction Y of the slope 6 with a gradient along the slope of the slope 6. Here, the top surface 21 of the both side walls 20 of the upstream vertical drainage groove 2 a is connected to the top end 40 of the water collecting basin 4, and the groove bottom 22 a of the upstream vertical drainage groove 2 a is inclined to the slope 6. The upper side wall 41a of the catchment basin 4 is connected to the upstream side of the catchment basin 4 at a position higher than the basin 42 of the catchment basin 4 while maintaining the gradient along the line. Further, the groove bottom 22 b of the downstream vertical drainage groove 2 b is connected to the bottom 42 of the water collecting basin 4.

小段排水溝３は、小段７に沿って小段７の長さ方向Ｘに敷設される。ここで、集水桝４の左側に位置する小段排水溝３ａの両側壁３０の頂面３１は集水桝４の天端４０に連結している。また、小段排水溝３ａの溝底３２ａは、上流側の縦排水溝２ａの溝底２２ａと集水桝４の上流側の側壁４１ａとの連結位置よりも高い位置において集水桝４の左側の側壁４１ｂに連結している。同様に、集水桝４の右側に位置する小段排水溝３ｂの両側壁３０の頂面３１は集水桝４の天端４０に連結している。また、この小段排水溝３ｂの溝底３２ｂは、上流側の縦排水溝２ａの溝底２２ａと集水桝４の上流側の側壁４１ａとの連結位置より高い位置において集水桝４の右側の側壁４１ｃに連結している。   The small drainage grooves 3 are laid in the length direction X of the small steps 7 along the small steps 7. Here, the top surfaces 31 of the side walls 30 of the small drainage groove 3 a located on the left side of the catchment basin 4 are connected to the top end 40 of the catchment basin 4. Further, the groove bottom 32a of the small drainage groove 3a is located on the left side of the water collecting basin 4 at a position higher than the connection position between the groove bottom 22a of the upstream vertical drainage groove 2a and the upstream side wall 41a of the water collecting basin 4. It is connected to the side wall 41b. Similarly, the top surfaces 31 of the side walls 30 of the small drainage groove 3 b located on the right side of the catchment 4 are connected to the top end 40 of the catchment 4. Further, the groove bottom 32b of the small drainage groove 3b is located on the right side of the catchment basin 4 at a position higher than the connection position between the groove bottom 22a of the upstream longitudinal drainage groove 2a and the upstream side wall 41a of the catchment basin 4. It is connected to the side wall 41c.

集水桝４は、上流側の縦排水溝２ａと、左右両側の小段排水溝３ａ、３ｂの少なくとも一方から流水を集水し、下流側の縦排水溝２ｂに排水する。   The drainage basin 4 collects running water from at least one of the upstream vertical drainage groove 2a and the left and right small drainage grooves 3a and 3b, and drains it into the downstream vertical drainage groove 2b.

集水桝４の天端４０は、上流側の縦排水溝２ａの両側壁２０の頂面２１および左右両側の小段排水溝３ａ、３ｂそれぞれの両側壁３０の頂面３１と連結している。   The top end 40 of the water collecting basin 4 is connected to the top surface 21 of the both side walls 20 of the upstream vertical drainage groove 2a and the top surface 31 of the both side walls 30 of each of the left and right small drainage grooves 3a and 3b.

集水桝４の上流側の側壁４１ａには、上流側の縦排水溝２ａにつながる開口部（連結口）４３ａが形成されており、この連結口４３ａの下端４３０ａは、法面６の傾斜に沿った勾配を有する上流側の縦排水溝２ａの溝底２２ａと連結している。   The upstream side wall 41a of the catchment basin 4 is formed with an opening (connecting port) 43a connected to the upstream vertical drainage groove 2a, and the lower end 430a of the connecting port 43a is inclined to the slope 6. It connects with the groove bottom 22a of the upstream vertical drain ditch 2a which has the gradient along.

集水桝４の左側の側壁４１ｂには、左側の小段排水溝３ａにつながる開口部（連結口）４３ｂが形成されており、この連結口４３ｂの下端４３０ｂは、上流側の側壁４１ａに形成されている連結口４３ａの下端４３０ａより高い位置（ｈ１＞ｈ３）において左側の小段排水溝３ａの溝底３２ａと連結している。同様に、集水桝４の右側の側壁４１ｃには、右側の小段排水溝３ｂにつながる開口部（連結口）４３ｃが形成されており、この連結口４３ｃの下端４３０ｃは、上流側の側壁４１ａに形成されている連結口４３ａの下端４３０ａより高い位置（ｈ２＞ｈ３）において右側の小段排水溝３ｂの溝底３２ｂと連結している。   An opening (connecting port) 43b connected to the left small drainage groove 3a is formed on the left side wall 41b of the catchment basin 4, and a lower end 430b of the connecting port 43b is formed on the upstream side wall 41a. At the position higher than the lower end 430a of the connecting port 43a (h1> h3), it is connected to the groove bottom 32a of the left small drainage groove 3a. Similarly, an opening (connecting port) 43c connected to the right side drainage groove 3b is formed in the right side wall 41c of the water collecting basin 4, and a lower end 430c of the connecting port 43c is connected to the upstream side wall 41a. Are connected to the groove bottom 32b of the right-side small drainage groove 3b at a position higher than the lower end 430a of the connection port 43a (h2> h3).

集水桝４の桝底４２は、上流側の側壁４１ａから、小段７と下流側の法面６ｂとの境界８を超えて下流側の縦排水溝２ｂの溝底２２ｂと交差する位置９まで平坦に形成されており、この交差位置９において下流側の縦排水溝２ｂの溝底２２ｂと連結している（図６参照）。   The basin 42 of the catchment basin 4 extends from the upstream side wall 41a to the position 9 crossing the groove bottom 22b of the downstream vertical drainage groove 2b beyond the boundary 8 between the small step 7 and the downstream slope 6b. It is formed flat, and is connected to the groove bottom 22b of the vertical drainage groove 2b on the downstream side at the intersection 9 (see FIG. 6).

また、集水桝４には、以下に示すように、小段７と下流側の法面６ｂとの境界８付近から下流側の縦排水溝２ｂとの連結位置９に向かうにつれて徐々に幅が小さくなるようにテーパが付けられている。集水桝４の幅は、集水桝４の上流側の側壁４１ａから小段７と下流側の法面６ｂとの境界８付近まではほぼ均一の底寸法ｄ１を有しているが、そこから下流側の縦排水溝２ｂとの連結位置９に近づくにつれて徐々に狭くなり、下流側の縦排水溝２ｂとの連結位置９において下流側の縦排水溝２ｂの溝幅寸法ｄ２とほぼ等しくなっている（図２参照）。具体的には、集水桝４の左側の側壁４１ｂは、小段７と下流側の法面６ｂとの境界８付近の位置で、集水桝４の右側の側壁４１ｃとの間隔が狭くなるように内側に折れ曲がり、下流側の縦排水溝２ｂの左側の側壁２０ａと連結している。同様に、集水桝４の右側の側壁４１ｃは、小段７と下流側の法面６ｂとの境界８付近の位置で内側に折れ曲がり、下流側の縦排水溝２ｂの右側の側壁２０ｂと連結している。   Further, as shown below, the width of the catchment basin 4 gradually decreases from the vicinity of the boundary 8 between the small step 7 and the downstream slope 6b toward the connection position 9 with the downstream vertical drainage groove 2b. It is tapered so that The catchment basin 4 has a substantially uniform bottom dimension d1 from the upstream side wall 41a of the catchment basin 4 to the vicinity of the boundary 8 between the small step 7 and the downstream slope 6b. It gradually becomes narrower as it approaches the connection position 9 with the downstream vertical drainage groove 2b, and becomes substantially equal to the groove width dimension d2 of the downstream vertical drainage groove 2b at the connection position 9 with the downstream vertical drainage groove 2b. (See FIG. 2). Specifically, the left side wall 41b of the water collecting basin 4 is located near the boundary 8 between the small step 7 and the downstream slope 6b so that the interval between the right side wall 41c of the water collecting basin 4 is narrowed. And is connected to the left side wall 20a of the vertical drainage groove 2b on the downstream side. Similarly, the right side wall 41c of the catchment basin 4 is bent inward at a position near the boundary 8 between the small step 7 and the downstream slope 6b, and is connected to the right side wall 20b of the downstream vertical drainage groove 2b. ing.

上記構成の排水構造１では、上流側の縦排水溝２ａの両側壁２０の頂面２１と集水桝４の天端４０とが連結し、かつ上流側の縦排水溝２ａの溝底２２ａが、法面６の傾斜に沿った勾配を維持したまま、集水桝４の上流側の側壁４１ａに連結しているので、上流側の縦排水溝２ａからの水流が、法面６の傾斜に沿った角度を維持したまま集水桝４の内部に流入する。これにより、上流側の縦排水溝２ａからの水流を、集水桝４の桝底領域へ向けて効率よく送り込むことができる。   In the drainage structure 1 configured as described above, the top surface 21 of the both side walls 20 of the upstream vertical drainage groove 2a and the top end 40 of the water collecting basin 4 are connected, and the groove bottom 22a of the upstream vertical drainage groove 2a is Since it is connected to the upstream side wall 41a of the catchment basin 4 while maintaining the slope along the slope of the slope 6, the water flow from the upstream longitudinal drainage groove 2a is inclined to the slope of the slope 6. The water flows into the catchment basin 4 while maintaining the angle along it. Thereby, the water flow from the upstream vertical drainage groove 2 a can be efficiently fed toward the bottom area of the water collecting basin 4.

また、集水桝４の桝底４２が、上流側の側壁４１ａから小段７と下流側の法面６ｂとの境界８を超えて下流側の縦排水溝２ｂの溝底２２ｂと交差する位置９まで平坦に形成され、この交差位置９において下流側の縦排水溝２ｂの溝底２２ｂと連結しているので、集水桝４に集水された雨水等の水面から桝底４２までの全領域を下流側の縦排水溝２ｂへの排水断面として利用することができる。このため、集水桝４の流下能力が向上し、集水桝４から排水される雨水等の流速が水面領域において過剰に速くなるのを防止でき、これにより、小段７と下流側の法面６ｂとの境界８において、流水が集水桝４から勢いよく飛び出してしまうのを防止できる。また、集水桝の流下能力の向上により、集水桝４の水位が上昇して集水桝４から雨水等が溢れ出るのを防止できる。したがって、本実施の形態によれば、縦排水溝２および小段排水溝３の合流部分における溢水を効果的に防止することができる。   Further, a position 9 where the bottom 42 of the water collecting basin 4 intersects the groove bottom 22b of the downstream vertical drainage groove 2b beyond the boundary 8 between the small step 7 and the downstream slope 6b from the upstream side wall 41a. And is connected to the groove bottom 22b of the downstream vertical drainage groove 2b at the crossing position 9, so that the entire area from the surface of the rainwater collected in the catchment 4 to the bottom 42 Can be used as a drainage cross section to the vertical drainage groove 2b on the downstream side. For this reason, the flow-through capacity of the catchment basin 4 is improved, and it is possible to prevent the flow velocity of rainwater or the like drained from the catchment basin 4 from being excessively increased in the water surface region. It is possible to prevent the running water from jumping out of the catchment basin 4 at the boundary 8 with 6b. Further, by improving the flow capacity of the catchment basin, it is possible to prevent the water level of the catchment basin 4 from rising and overflowing rainwater and the like from the catchment basin 4. Therefore, according to this Embodiment, the overflow in the junction part of the vertical drainage groove 2 and the small stage drainage groove 3 can be prevented effectively.

また、上記構成の排水構造１では、集水桝４の桝底４２に減勢工５を配置しているので、上流側の縦排水溝２ａから、法面６ａの傾斜に沿った勾配で集水桝４内に流入する雨水等の水流を減勢工５に衝突させ、その勢いを効果的に減勢させることができる。これにより、縦排水溝２および小段排水溝３の合流部分における溢水をより効果的に防止することができる。   Further, in the drainage structure 1 having the above-described configuration, since the depressurization work 5 is arranged at the bottom 42 of the catchment basin 4, the drainage structure 1 is collected from the upstream longitudinal drainage groove 2a with a slope along the slope of the slope 6a. The water flow such as rain water flowing into the water tank 4 can collide with the depressurization work 5, and the force can be effectively reduced. Thereby, the overflow in the junction part of the vertical drainage groove 2 and the small stage drainage groove 3 can be prevented more effectively.

また、上記構成の排水構造１では、集水桝４の左右両側の側壁４１ｂ、４１ｃに設けた小段排水溝３ａ、３ｂとの連結口４３ｂ、４３ｃの下端４３０ｂ、４３０ｃを、上流側の側壁４１ａに設けた連結口４３ａの下端４３０ａよりも高い位置に設けているので（図４参照）、上流側の縦排水溝２ａからの水流と左右両側の小段排水溝３ａ、３ｂからの水流の流入位置を集水桝４内の上下に分散させることができる。これにより、上流側の縦排水溝２ａから集水桝４に流入する雨水等と左右両側の小段排水溝３ａ、３ｂの少なくとも一方から集水桝４に流入する雨水等とのぶつかり合いを防止して水流の勢いが加速するのを抑制できるとともに、集水桝４の水位を低下させることができ、縦排水溝２および小段排水溝３の合流部分における溢水をさらに効果的に防止することができる。
Further, in the drainage structure 1 having the above-described configuration, the lower ends 430b and 430c of the connection ports 43b and 43c with the small drainage grooves 3a and 3b provided on the left and right side walls 41b and 41c of the drainage basin 4 are connected to the upstream side wall 41a. Since it is provided at a position higher than the lower end 430a of the connection port 43a provided at the position (see FIG. 4), the inflow position of the water flow from the upstream vertical drainage groove 2a and the waterflow from the left and right small drainage grooves 3a, 3b Can be dispersed vertically in the water collecting basin 4. This prevents rainwater and the like flowing from the upstream side of the longitudinal drainage grooves 2a in the water collecting basins 4 and right and left sides of the berm culvert 3a, a clash from at least one of 3b with rainwater flowing into the water collecting basins 4 As a result, acceleration of the water flow can be suppressed, the water level of the catchment basin 4 can be lowered, and overflow at the joining portion of the vertical drainage groove 2 and the small drainage groove 3 can be more effectively prevented. .

なお、本発明は上記の実施の形態に限定されるものではなく、その要旨の範囲内で数々の変形が可能である。例えば、上記の実施の形態では、集水桝４の桝底４２に減勢工５を配置しているが、それに代えて、あるいはそれに加えて、集水桝４の桝底４２に、流水の勢いを減勢させる凹凸を設けてもよい。また、現場打ちにより縦排水溝２および小段排水溝３と集水桝４とを一体的に形成してもよいし、あるいは、現場にて、集水桝４のプレキャスト製品を、敷設された縦排水溝２および小段排水溝３と連結してもよい。   In addition, this invention is not limited to said embodiment, Many deformation | transformation are possible within the range of the summary. For example, in the above-described embodiment, the depressurization work 5 is arranged at the bottom 42 of the catchment basin 4, but instead of or in addition to this, the bottom 42 of the catchment basin 4 has a flowing water. Concavities and convexities that reduce the momentum may be provided. Alternatively, the vertical drainage channel 2 and the small drainage channel 3 and the drainage basin 4 may be integrally formed by on-site driving, or a precast product of the drainage basin 4 is laid on the site. The drainage groove 2 and the small drainage groove 3 may be connected.

１：排水構造、 ２、２ａ、２ｂ：縦排水溝、 ３、３ａ、３ｂ：小段排水溝、 ４：集水桝、 ５：減勢工、 ６、６ａ、６ｂ：法面、 ７：小段、 ２０：縦排水溝２ａの側壁、 ２０ａ、２０ｂ：縦排水溝２ｂの側壁、 ２１：側壁２０の頂面、 ２２ａ：縦排水溝２ａの溝底、 ２２ｂ：縦排水溝２ｂの溝底、 ３０：小段排水溝３ａ、３ｂの側壁、 ３１：側壁３０の頂面、 ３２ａ：小段排水溝３ａの溝底、 ３２ｂ：小段排水溝３ｂの溝底、 ４０：集水桝４の天端、 ４１ａ：集水桝４の上流側の側壁、 ４１ｂ：集水桝４の左側の側壁、 ４１ｃ：集水桝４の右側の側壁、 ４２：集水桝４の桝底、 ４３ａ：側壁４１ａの開口部（上流側の縦排水溝２ａ用の連結口）、 ４３ｂ：側壁４１ｂの開口部（左側の小段排水溝３ａ用の連結口）、 ４３ｃ：側壁４１ｃの開口部（右側の小段排水溝３ｂ用の連結口）、 ４３０ａ：連結口部４３ａの下端、 ４３０ｂ：連結口部４３ｂの下端、 ４３０ｃ：連結口部４３ｃの下端
1: drainage structure, 2, 2a, 2b: vertical drainage groove, 3, 3a, 3b: small drainage groove, 4: drainage trough, 5: depressurization work, 6, 6a, 6b: slope, 7: small step, 20: Side wall of vertical drainage groove 2a, 20a, 20b: Side wall of vertical drainage groove 2b, 21: Top surface of side wall 20, 22a: Bottom of vertical drainage groove 2a, 22b: Bottom of vertical drainage groove 2b, 30: Side walls of the small drainage grooves 3a and 3b, 31: Top surface of the side wall 30, 32a: The bottom of the small drainage groove 3a, 32b: The bottom of the small drainage groove 3b, 40: The top end of the drainage basin 4, 41a: Collection 41b: left side wall of the catchment 4; 41c: right side wall of the catchment 4; 42: bottom of the catchment 4; 43a: opening of the side wall 41a (upstream) Side connection port for vertical drainage groove 2a), 43b: opening of side wall 41b (connection port for left side small drainage groove 3a), 43c: side Opening of 41c (connection hole for berm drainage groove 3b on the right side), 430a: lower end of the connecting opening portion 43a, 430b: lower end of the connecting opening portion 43 b, 430c: bottom of the connection hole portion 43c

Claims (6)

小段が設けられた法面に敷設される排水構造であって、
前記法面に、当該法面の傾斜に沿った勾配で当該法面の傾斜方向に敷設された上流側および下流側の縦排水溝と、
前記小段に、当該小段の長さ方向に敷設された小段排水溝と、
前記上流側の縦排水溝と前記小段排水溝との合流部分に配置され、前記上流側の縦排水溝および前記小段排水溝から、桝底および桝側壁に囲まれた桝内への流入水を、前記下流側の縦排水溝に排水する集水桝と、を備え、
前記上流側の縦排水溝の両側壁の頂面は、前記集水桝の天端に連結し、
前記上流側の縦排水溝の溝底は、前記法面の傾斜に沿った勾配を維持したまま、前記桝側壁のうち、前記小段と上流側の前記法面との境界側に位置する第一の桝側壁に連結しており、
前記桝底は、前記上流側の縦排水溝の溝底よりも低い位置において、前記第一の桝側壁から下流側の前記法面まで水平に設けられて、前記下流側の縦排水溝の溝底に連結し、前記桝側壁のうち、前記第一の桝側壁の両側を挟むように対向して配置された第二および第三の桝側壁は、前記小段と下流側の前記法面との境界側から、前記桝底と前記下流側の縦排水溝の溝底との連結位置に向かうに従って間隔が狭くなり、前記下流側の縦排水溝の側壁に連結している
ことを特徴とする排水構造。 A drainage structure laid on a slope with a step,
On the slope, upstream and downstream longitudinal drainage grooves laid in the slope direction of the slope with a slope along the slope of the slope,
A small drainage groove laid in the length direction of the small step in the small step,
The inflow water is disposed at the confluence of the upstream vertical drainage groove and the small drainage groove , and the inflow water from the upstream vertical drainage groove and the small drainage groove into the tub surrounded by the dredge bottom and the dredging side wall. A drainage basin for draining into the downstream vertical drainage channel ,
The top surface of both side walls of the longitudinal drainage ditch before Symbol upstream, coupled on the top end of the water collecting basins,
The groove bottom of the upstream vertical drainage groove is a first located on the boundary side between the small step and the upstream slope on the side wall while maintaining the slope along the slope of the slope . of it has been linked to the basins side wall,
The trough bottom is provided horizontally from the first trough side wall to the slope on the downstream side at a position lower than the bottom of the upstream longitudinal drainage groove, and the downstream vertical drainage groove A second side wall and a third side wall connected to each other so as to sandwich both sides of the first side wall among the side walls; The drainage is characterized in that the distance decreases from the boundary side toward the connection position of the bottom of the vertical drainage groove and the bottom of the vertical drainage groove on the downstream side and is connected to the side wall of the vertical drainage groove on the downstream side. Construction. 請求項１に記載の排水構造であって、
前記集水桝は、前記桝底に配置された減勢工を有する
ことを特徴とする排水構造。 The drainage structure according to claim 1,
The drainage basin has a depressurization work disposed on the bottom of the basin. 請求項１または２に記載の排水構造であって、
前記小段排水溝の溝底は、前記上流側の縦排水溝と前記集水桝との連結位置における前記上流側の縦排水溝の溝底よりも高い位置で、前記集水桝の側壁と連結している
ことを特徴とする排水構造。 The drainage structure according to claim 1 or 2,
The groove bottom of the small drainage groove is connected to the side wall of the catchment basin at a position higher than the groove bottom of the upstream longitudinal drainage groove at the connection position of the upstream longitudinal drainage groove and the catchment basin. Drainage structure characterized by 法面に、当該法面の傾斜に沿った勾配で当該法面の傾斜方向に敷設された上流側および下流側の縦排水溝と、小段に、当該小段の長さ方向に敷設された小段排水溝との合流部分に配置され、前記上流側の縦排水溝および前記小段排水溝からの流入水を前記下流側の縦排水溝に排水する集水桝であって、
桝底と前記桝底の周りを囲む桝側壁と、を有し、
前記桝側壁は、
前記小段と上流側の前記法面との境界側に配置されており、前記上流側の縦排水溝の両側壁の頂面が天端に連結され、前記上流側の縦排水溝の溝底が前記法面の傾斜に沿った勾配を維持したまま前記桝底よりも高い位置で連結された第一の桝側壁と、
前記第一の桝側壁の両側を挟むように対向して配置された第二および第三の桝側壁と、を含み、
前記桝底は、前記上流側の縦排水溝の溝底よりも低い位置において、前記第一の桝側壁から下流側の前記法面まで水平に設けられて、前記下流側の縦排水溝の溝底に連結されており、
前記第二および第三の側壁は、
前記小段と下流側の前記法面との境界側から、前記下流側の縦排水溝の溝底と前記桝底との連結位置に向かうに従って間隔が狭くなり、前記下流側の縦排水溝の両側壁に連結している
ことを特徴とする集水桝。 On the slope, an upstream and downstream longitudinal drainage channel laid in the slope direction of the slope with a slope along the slope of the slope, and a small stage drainage laid in the length direction of the stage. A drainage basin that is disposed at a junction with a groove and drains inflow water from the upstream vertical drainage groove and the small drainage groove to the downstream vertical drainage groove,
A heel bottom and a heel side wall surrounding the heel bottom;
The heel side wall
It is arranged on the boundary side between the small step and the slope on the upstream side, the top surfaces of both side walls of the upstream vertical drainage groove are connected to the top end, and the groove bottom of the upstream vertical drainage groove is A first side wall connected at a position higher than the bottom while maintaining a slope along the slope of the slope;
And second and third heel side walls arranged to face each other on both sides of the first heel side wall,
The trough bottom is provided horizontally from the first trough side wall to the slope on the downstream side at a position lower than the bottom of the upstream longitudinal drainage groove, and the downstream vertical drainage groove Connected to the bottom ,
The second and third sidewalls are
From the boundary side between the small stage and the slope on the downstream side, the interval becomes narrower toward the connecting position between the bottom of the vertical drainage groove on the downstream side and the bottom of the trough, and both sides of the downstream drainage groove on the downstream side A catchment that is connected to the wall . 請求項４に記載の集水桝であって、
前記桝底に配置された減勢工を有する
ことを特徴とする集水桝。 The water collecting tank according to claim 4,
A drainage basin characterized by having a depressurizer disposed on the bottom of the basin. 請求項４または５に記載の集水桝であって、
前記第二および第三の側壁は、それぞれ、前記第一の側壁と前記上流側の縦排水溝の溝底との連結位置よりも高い位置で、前記第二の側壁側の小段排水溝の溝底および前記第三の側壁側の小段排水溝の溝底と連結する
ことを特徴とする集水桝。 A catchment tank according to claim 4 or 5,
The second and third side walls are higher than the connection position of the first side wall and the groove bottom of the vertical drainage groove on the upstream side, respectively, and the groove of the small drainage groove on the second side wall side. A drainage basin characterized by being connected to the bottom and the bottom of the third drainage groove on the side of the third side wall.
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