JPS6328985Y2 - - Google Patents
Info
- Publication number
- JPS6328985Y2 JPS6328985Y2 JP19384283U JP19384283U JPS6328985Y2 JP S6328985 Y2 JPS6328985 Y2 JP S6328985Y2 JP 19384283 U JP19384283 U JP 19384283U JP 19384283 U JP19384283 U JP 19384283U JP S6328985 Y2 JPS6328985 Y2 JP S6328985Y2
- Authority
- JP
- Japan
- Prior art keywords
- water
- energy
- discharge pipe
- water discharge
- tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 51
- 230000001603 reducing effect Effects 0.000 claims description 17
- 230000000694 effects Effects 0.000 description 7
- 238000009792 diffusion process Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
この考案は、貯水ダムの深部に設けた放水管か
ら射出される高エネルギーの放流水を減勢させる
装置に関するものである。[Detailed description of the invention] [Industrial application field] This invention relates to a device that deenergizes high-energy water discharged from a water discharge pipe provided deep in a water storage dam.
貯水ダムの深部に設置した放水管の下流側開口
部にはジエツトフローゲート又はホロージエツト
バルブが設けられ、高いエネルギーをもつ放流水
は、上記ゲート又はバルブにより流量調節された
後、第1図に示すように側壁及びエンドシルによ
つて構成された減勢槽へ放流され、ここにおいて
水中噴流拡散及びエンドシルへの衝突による拡散
作用を受け、減勢された後エンドシル上を越流し
放流されるようになつている。しかし上記第1図
に示すような減勢槽では、高水頭になると減勢槽
が長くなり、かつ水面も激しく変動し、実際には
所期の減勢効果が得られない。そこで、この問題
を解決するために第2図〜第7図に示すような数
種の考案が開示されている。なおこれらの装置に
おいて、1は放水管、2はゲート又はバルブより
成る流量調節設備、3は減勢槽、4は減勢槽3を
構成する側壁、5はエンドシルである。
A jet flow gate or hollow jet valve is installed at the downstream opening of the water discharge pipe installed in the deep part of the water storage dam, and after the discharged water with high energy is adjusted in flow rate by the gate or valve, As shown in the figure, the water is discharged into a deenergization tank composed of a side wall and an end sill, where it is subjected to diffusion effects due to underwater jet diffusion and collision with the end sill, and after being deenergized, it is discharged over the end sill. It's becoming like that. However, in the energy reducing tank as shown in FIG. 1, when the water head becomes high, the energy reducing tank becomes long and the water surface fluctuates violently, so that the desired energy reducing effect cannot actually be obtained. In order to solve this problem, several types of devices as shown in FIGS. 2 to 7 have been disclosed. Note that in these devices, 1 is a water discharge pipe, 2 is a flow rate regulating device consisting of a gate or a valve, 3 is an energy reducing tank, 4 is a side wall forming the energy reducing tank 3, and 5 is an end sill.
ところで、第2図及び第3図に示すものは、噴
流がエンドシル5に衝突した後、これが上方に向
う流れによつて起る水面変動を抑えることを目的
としたもので、第2図はエンドシル5の上部に平
板6を配設し、これをもつて水位変動を強制的に
抑制するものである。しかしこの手段では高水頭
になつた場合、平板6はかなり大きなものを必要
とし、土木構造物としてその施工が至難である。
又第3図はエンドシル5の上端前面に突縁7を設
け、これによる波返し作用により上昇水を強制的
に前方へ反射させ、いわゆる渦の形成による減勢
効果をねらつたものであるが、高水頭の場合十分
機能せず、減勢槽上流水面の上昇変動をさけるこ
とができない。 By the way, what is shown in FIGS. 2 and 3 is intended to suppress water level fluctuations caused by the upward flow of the jet after it collides with the end sill 5. A flat plate 6 is disposed on top of the water tank 5 to forcibly suppress water level fluctuations. However, with this method, when the water head becomes high, the flat plate 6 needs to be quite large, and it is extremely difficult to construct it as a civil engineering structure.
In addition, in Fig. 3, a projecting edge 7 is provided on the front surface of the upper end of the end sill 5, and the rising water is forcibly reflected forward by the wave-returning effect caused by this, aiming at a force-reducing effect by the formation of a so-called vortex. In the case of high water head, it does not function well and it is not possible to avoid rising fluctuations in the water level upstream of the energy reduction tank.
次に第4図及び第5図に示すものは、ともに噴
流の分散による減勢効果をねらつたものである。
つまり第4図は、放水管端部開口部下流側に棒状
部材8を複数個立設配置し、噴流水がこれら棒状
部材8を通過するうちに、その下流側に渦列を形
成させ、これによつて減勢させるという手段であ
るが、しかし高速噴流と渦列発生によつて助長さ
れる振動に耐え得る棒状部材を設置することは困
難であり、更に放流水の高エネルギーをカルマン
渦列のみによつて減勢させることには限界があ
る。 Next, the systems shown in FIGS. 4 and 5 are both aimed at reducing energy by dispersing the jet flow.
In other words, in FIG. 4, a plurality of rod-like members 8 are arranged upright on the downstream side of the opening at the end of the water discharge pipe, and as the jet water passes through these rod-like members 8, a vortex row is formed on the downstream side. However, it is difficult to install a rod-shaped member that can withstand the vibrations promoted by the high-speed jet and the generation of the vortex street, and furthermore, the high energy of the discharged water is reduced by the Karman vortex street. There are limits to how much power can be reduced solely by
又第5図に示すものは、噴流分割部材9を立設
し、これらの頂端をひさし材10で連結した構造
であり、これは分割された一部噴流の上昇流をひ
さし材10で抑えて減勢させようとするものであ
るが、上記第4図に示すものと同様にその減勢効
果に限界があり、特に高水頭時における減勢作用
は期待できない。 Furthermore, the structure shown in FIG. 5 is a structure in which jet flow dividing members 9 are installed upright and their top ends are connected by a canopy material 10. Although this is intended to reduce the force, there is a limit to its force reduction effect, similar to the one shown in FIG.
更に第6図に示すものは、多数の孔を開設した
デフレクター11を設置して、噴流の一部を上記
孔から噴出させて拡散させるとともに残りの水を
デフレクター11の前部で渦流化させた後、上部
を越流させるようにしたものであるが、この装置
では孔の施工が困難であり、又孔を貫流させるだ
けでは減勢効果が十分発揮されず、又小さな孔で
はほとんどの噴流水はデフレクターを越流せざる
を得ないことから、水面上昇が激しくなることは
必至である。 Furthermore, in the one shown in FIG. 6, a deflector 11 with a large number of holes is installed, and a part of the water jet is ejected from the holes and diffused, and the remaining water is turned into a vortex at the front of the deflector 11. After that, the upper part was made to overflow, but with this device it was difficult to construct holes, and simply allowing the flow to flow through the holes did not have a sufficient energy-reducing effect, and with small holes, most of the jet water As the water has no choice but to overflow the deflector, it is inevitable that the water level will rise rapidly.
又第7図に示すものは、槽内の幅方向にバツフ
ルピアー12を複数個定間隔に並設するとともに
エンドシル5の前面に凹状のデフレクタ13を形
成し、噴流水の一部をバツフルピア12に当てて
上向きの流れに変えて渦を形成させ、又バツフル
ピア12間を通過した水をデフレクタ13で下向
きに変流して回転させることにより減勢させるよ
うにしたものである。しかしこの装置では特にバ
ツフルピア12と減勢槽3及び放水管との相対位
置と寸法に関して十分考求されない限り、所期の
減勢効果を得ることができない。 Further, in the device shown in FIG. 7, a plurality of vertical piers 12 are arranged in parallel at regular intervals in the width direction of the tank, and a concave deflector 13 is formed on the front surface of the end sill 5, so that a part of the jet water is applied to the vertical piers 12. The flow is changed upward to form a vortex, and the water that has passed between the baffle piers 12 is deflected downward by a deflector 13 and rotated to reduce energy. However, with this device, unless sufficient consideration is given to the relative positions and dimensions of the buffer pier 12, the energy reducing tank 3, and the water discharge pipe, it is not possible to obtain the desired energy reducing effect.
以上従来の諸装置に総括するに、いずれも特に
高水頭時における減勢効果が期待できず、又水面
が激しく変動して騒音を発生するという危惧が存
在しており、加えてこの種装置を実施する上での
技術的条件とされる、寸法的諸数値による具体的
構造が全く示されておらず、単に減勢槽とそれに
求められる概念を開示したに過ぎない。 To summarize the various conventional devices mentioned above, none of them can be expected to have a force-reducing effect, especially at times of high water head, and there are concerns that the water surface will fluctuate violently and generate noise. No concrete structure with dimensional values, which are considered as technical conditions for implementation, is shown at all, and the invention merely discloses the energy-reducing tank and the concept required for it.
この考案は、可及的簡単な構造をもち、しかも
数値的に限定された最も有効な減勢装置であつ
て、特に高水頭でも十分減勢され、水面の波立ち
と騒音の抑制を達成し得る装置を提供し、上記従
来の諸問題を解決することを目的としてなされた
ものである。
This device has the simplest structure possible, and is the most effective energy reducing device with limited numerical values.It can sufficiently reduce energy even in particularly high water heads, and can suppress ripples on the water surface and noise. The purpose of this invention is to provide a device and solve the above-mentioned conventional problems.
この考案はダム放水管に連接せしめて構成した
減勢槽のほぼ中央部に、上記放水管の端部開口に
対向し、かつ放水管の管径の1〜3倍の幅をもつ
バツフルピアーを立設したことを特徴とするもの
である。
This idea is based on the idea that a vertical pier is installed approximately in the center of a deenergization tank connected to a dam water pipe, facing the opening at the end of the water pipe, and having a width of 1 to 3 times the diameter of the water pipe. It is characterized by the fact that it has been established.
以下この考案を第8図及び第9図に示す一実施
例にもとづいて説明する。なお図中従来の装置と
同一部分は同一符号をもつて示す。
This invention will be explained below based on an embodiment shown in FIGS. 8 and 9. In the drawings, parts that are the same as those of the conventional device are designated by the same reference numerals.
すなわち14は減勢槽3のほぼ中央部に立設し
たバツフルピアーであり、これは放水管1の端部
開口に対向し、しかもその幅はこの放水管管径の
1〜3倍の範囲で決定される。 That is, 14 is a vertical pier installed approximately in the center of the energy reducing tank 3, which faces the opening at the end of the water discharge pipe 1, and its width is determined within a range of 1 to 3 times the diameter of this water discharge pipe. be done.
したがつて放水管1を通つた水流は、流量調節
設備2を介して減勢槽3に放流され、高エネルギ
ーを保有する放流水は水中内で拡散しながら、そ
の中心部の高速流がバツフルピアー14の前面に
衝突して方向を変換させられ、又中心外の噴流
は、バツフルピアー14と側壁4の間を流通し
て、上記バツフルピアー14に衝突して偏向させ
られた流れと相互干渉し、撹拌作用を受けて減衰
しながら後方へ流動し、更にエンドシル5に衝突
し、かつ渦流を形成して拡散し減衰される。 Therefore, the water flow that has passed through the water discharge pipe 1 is discharged into the energy reduction tank 3 via the flow rate adjustment equipment 2, and while the discharged water containing high energy is diffused in the water, the high-speed flow in the center is The off-center jet flows between the pier 14 and the side wall 4 and interferes with the flow deflected by colliding with the pier 14, causing agitation. It flows rearward while being attenuated by the action, further collides with the end sill 5, forms a vortex, and is diffused and attenuated.
この考案の寸法的諸数値にもとづく具体的実施
例を示せば次のとおりである。
Specific examples based on the dimensional values of this invention are as follows.
すなわち放水管管径Dを基準として、減勢槽の
幅B=3〜5D、減勢槽の長さL=8〜15D、エ
ンドシルの高さ(放水管中心より上への距離)H
=3〜5D、段落ち深さy1=1.5D以上、バツフル
ピアーの幅b=1〜3D、バツフルピアーの位置
x=3D〜8D(標準は減勢槽の長さのほぼ中央)、
バツフルピアーの高さy2=1D〜2Dとする。 That is, based on the water discharge pipe diameter D, the width of the energy reducing tank B = 3 to 5D, the length of the energy reducing tank L = 8 to 15D, and the height of the end sill (distance above the center of the water discharge pipe) H
= 3 to 5D, step depth y 1 = 1.5D or more, width of the vertical pier b = 1 to 3D, position of the vertical pier x = 3D to 8D (standard is approximately the center of the length of the energy reducing tank),
The height of the full pier is set to y 2 =1D to 2D.
この考案によれば、減勢槽内へ放流する噴流エ
ネルギーを、バツフルピアーに至る迄の水中拡散
バツフルピアーへの衝突偏向、この偏向流と側壁
とバツフルピアーとの間を流れる水流との混合拡
散、エンドシルへの衝突、エンドシルとバツフル
ピアー後方間での混合拡散と槽全域にわたつて効
果的に減勢され、これにより局部的な水面上昇も
発生せず、水面の一様性が得られる。
According to this invention, the jet energy discharged into the energy reducing tank is diffused underwater up to the buttful pier, is deflected by colliding with the buttful pier, is mixed with the water flow flowing between the side wall and the buttful pier, and is diffused to the end sill. collision, mixing and diffusion between the end sill and the back of the buttful pier, and force is effectively reduced over the entire tank area, thereby preventing local water level rise and achieving a uniform water surface.
第1図〜第7図は従来の減勢槽の構造を示す説
明図、第8図はこの考案の一実施例を示す平面
図、第9図a,bは第8図におけるX−X断面図
である。
1は放水管、2は流量調節設備、3は減勢槽、
4は側壁、5はエンドシル、14はバツフルピア
ー。
Figures 1 to 7 are explanatory diagrams showing the structure of a conventional energy reducing tank, Figure 8 is a plan view showing an embodiment of this invention, and Figures 9a and b are cross sections taken along line X-X in Figure 8. It is a diagram. 1 is a water discharge pipe, 2 is a flow rate adjustment equipment, 3 is a deenergization tank,
4 is the side wall, 5 is the end sill, and 14 is the buttful pier.
Claims (1)
ぼ中央部に、上記放水管の端部開口に対向し、か
つ放水管の管径の1〜3倍の幅をもつバツフルピ
アーを立設したことを特徴とするダム放水減勢装
置。 A vertical pier is erected approximately in the center of the energy reducing tank connected to the dam water discharge pipe, facing the end opening of the water discharge pipe and having a width of 1 to 3 times the diameter of the water discharge pipe. A dam water discharge energy reducing device featuring:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19384283U JPS60104426U (en) | 1983-12-16 | 1983-12-16 | Dam water discharge energy reduction device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19384283U JPS60104426U (en) | 1983-12-16 | 1983-12-16 | Dam water discharge energy reduction device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS60104426U JPS60104426U (en) | 1985-07-16 |
JPS6328985Y2 true JPS6328985Y2 (en) | 1988-08-04 |
Family
ID=30416818
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19384283U Granted JPS60104426U (en) | 1983-12-16 | 1983-12-16 | Dam water discharge energy reduction device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60104426U (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104831695B (en) * | 2015-05-26 | 2017-01-04 | 浙江海洋学院 | A kind of dissipation and scouring dam |
-
1983
- 1983-12-16 JP JP19384283U patent/JPS60104426U/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS60104426U (en) | 1985-07-16 |
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