JPH0359204B2 - - Google Patents
Info
- Publication number
- JPH0359204B2 JPH0359204B2 JP6740383A JP6740383A JPH0359204B2 JP H0359204 B2 JPH0359204 B2 JP H0359204B2 JP 6740383 A JP6740383 A JP 6740383A JP 6740383 A JP6740383 A JP 6740383A JP H0359204 B2 JPH0359204 B2 JP H0359204B2
- Authority
- JP
- Japan
- Prior art keywords
- weir
- water depth
- water
- height
- flexible membrane
- 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 47
- 238000011144 upstream manufacturing Methods 0.000 claims description 13
- 239000012528 membrane Substances 0.000 claims description 7
- 210000004779 membrane envelope Anatomy 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/005—Deformable barrages or barrages consisting of permanently deformable elements, e.g. inflatable, with flexible walls
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Barrages (AREA)
Description
【発明の詳細な説明】
（技術分野）
本発明は可撓性膜製起伏堰詳しくは堰の内圧を
或る範囲に限定することにより、上下流水深の変
化に対して、堰高の変化を小さくした水膨張式可
撓性膜製起伏堰に関するものである。Detailed Description of the Invention (Technical Field) The present invention provides an undulating weir made of a flexible membrane. Specifically, by limiting the internal pressure of the weir to a certain range, changes in weir height can be prevented in response to changes in upstream and downstream water depths. This invention relates to a water-inflatable flexible membrane undulating weir.
（従来技術とその問題点）
可撓性膜製起伏堰は堰体を形成するゴム引布等
可撓性膜製包被（袋状体）を河川等流れを横断す
る方向に少くとも河川等の床部に取り付け、包被
内部に空気、水或いはこれら両者等圧力媒体を送
入し包被を膨張起立させ又包被内部から圧力媒体
を排出し包被を収縮倒伏させるようにしたもので
ある（例えば特公昭40−11702号、特公昭44−
2371号参照）。(Prior art and its problems) An undulating weir made of a flexible membrane uses a flexible membrane envelope (bag-like body) such as rubber-coated cloth that forms the weir body at least in a direction across the flow of a river, etc. It is attached to the floor of the enclosure, and the pressure medium such as air, water, or both of these is introduced into the enclosure to inflate and erect the enclosure, and the pressure medium is discharged from the interior of the enclosure to cause the enclosure to contract and fall down. (For example, Special Publication No. 11702, Special Publication No. 11702, Special Publication No. 11702, Special Publication No. 11702, Special Publication No. 11702,
(See No. 2371).
この種の起伏堰の中圧力媒体に水を用いる水膨
張式では従来、第１図に示すような基本状態（上
流水深＝堰高H0、下流水深hd0＝０）では一般に
堰底内圧P0は堰の存在条件（P0〔mAq〕がH0
〔ｍ〕より大）および、内圧を大きくすると膜材
強度も比例して大きいものが必要となるため、１
＜P0／H0≦1.5であつた。 Conventionally, in the water expansion type of this type of undulating weir that uses water as the medium pressure medium, in the basic state shown in Figure 1 (upstream water depth = weir height H 0 , downstream water depth hd 0 = 0), the weir bottom internal pressure P 0 is the condition for the existence of a weir (P 0 [mAq] is H 0
[m]) and as the internal pressure is increased, the strength of the membrane material is also required to be proportionally larger.
<P 0 /H 0 ≦1.5.
この堰は第２図の機構断面図に示すように倒伏
水深Ｗは一定であるにもかかわらず下流水深に対
して堰高が変化する為第３図に示すように設計条
件より下流水深が変動した場合（図ａ，ｃ参照）
即ち
(イ) 設計条件を下流水深０の場合を想定したとき
（図ａ参照）
下流水深hdが上昇すると堰高Ｈが高くなり、
越流水深ｈが小、つまり小越流量で倒伏する
（図ｂ参照）。即ち堰高が上昇すると、越流水深
が小さくなり、小出水で倒伏水深に達するよう
になるから、頻雑に倒伏し、堰の要をなさな
い。 As shown in the cross-sectional view of the mechanism in Figure 2, this weir has a constant lodging water depth W, but the weir height changes with respect to the downstream water depth, so the downstream water depth changes due to the design conditions as shown in Figure 3. (See Figures a and c)
That is, (a) When the design condition is assumed to be a downstream water depth of 0 (see Figure a), as the downstream water depth hd increases, the weir height H increases,
Lodging occurs when the overflow water depth h is small, that is, the overflow flow is small (see Figure b). In other words, as the height of the weir increases, the overflow water depth becomes smaller and the overflow water reaches the overflowing depth with a small amount of water, which causes the weir to overturn frequently and becomes no longer essential to the weir.
(ロ) 設計条件を下流水深hdが高い場合を想定し
たとき（図ｃ参照）
下流水深が０になると堰高Ｈは低くなり越流
水深ｈが大、このため堰の越流振動が発生する
（図ｄ参照）。即ち堰高が下がり、高越流水深と
なり、堰体越流振動等が発生し、甚々しい時は
破壊に至る。(b) When the design conditions are assumed to be a case where the downstream water depth hd is high (see Figure c), when the downstream water depth becomes 0, the weir height H becomes low and the overflow water depth h becomes large, which causes overflow vibration of the weir. (See figure d). In other words, the height of the weir decreases, the overflow water depth becomes high, and vibrations of the overflow of the weir occur, leading to destruction in severe cases.
が起り、下流水深の変動がある防潮堰等には不適
である。occurs, making it unsuitable for tide protection weirs where downstream water depth fluctuates.
なお第１，２，３図中１は可撓性膜製包被、２
は水、３は河川等の床部、４は上流水、５は注排
水管、６はポンプ、７は排水口、８はサイフオン
式安全装置、９はバケツト、１０はバルブ、１１
はレバー式バルブ、１２は倒伏水位である。 In Figures 1, 2, and 3, 1 is a flexible membrane envelope, and 2 is a flexible membrane envelope.
is water, 3 is the floor of a river, etc., 4 is upstream water, 5 is an inlet/drainage pipe, 6 is a pump, 7 is a drain port, 8 is a siphon type safety device, 9 is a bucket, 10 is a valve, 11
is a lever-type valve, and 12 is a collapsed water level.
（発明の構成）
上記に鑑み本発明はこれら問題点を解消するた
め開発されたものである。(Structure of the Invention) In view of the above, the present invention has been developed to solve these problems.
即ち本発明の水膨張式可撓性膜製起伏堰は基本
状態（上流水深＝堰高、下流水深０）で堰底内圧
P0を1.6≦P0／H0≦2.0としたことを特徴とするもの
である。 In other words, the water-expandable flexible membrane undulating weir of the present invention has an internal pressure at the bottom of the weir in the basic state (upstream water depth = weir height, downstream water depth 0).
It is characterized in that P 0 is 1.6≦P 0 /H 0 ≦2.0.
上記本発明は本発明者の鋭意研究、努力の結果
の下記知見に基くものである。即ち基本状態より
上下流水深を変化させた時の堰高の変化は第４，
５図に示すようにある堰底内圧範囲で堰高の変化
が非常に小さい事が判つたことによる。 The above-mentioned present invention is based on the following findings as a result of the inventor's diligent research and efforts. In other words, the change in weir height when the upstream and downstream water depths are changed from the basic state is the fourth,
This is because, as shown in Figure 5, it was found that the change in weir height was extremely small within a certain range of weir bottom internal pressure.
第４図は水膨張式に於いて上流水深と堰高の関
係を示す図で横軸にhu／H0（上流水深／基本堰
高）、縦軸にＨ／H0（堰高／基本堰高）を取つて
いる。たゞしhd＝０、露出射流のときである。
グラフＡはP0／H0＝1.5、ＢはP0／H0＝1.6、Ｃ
はP0／H0＝1.7、ＤはP0／H0＝1.8、ＥはP0／H0
＝1.9、ＦはP0／H0＝2.0、ＧはP0／H0＝2.5の場
合である。即ち上流水深が大となると堰高は変化
するが、従来の場合（Ａ参照）に比して、本発明
の場合Ｂ，Ｃ，Ｄ，Ｅは堰高の変動が小さく、Ｆ
の場合も従来と略同等である。 Figure 4 shows the relationship between upstream water depth and weir height in the water expansion type.The horizontal axis is hu/H 0 (upstream water depth/basic weir height), and the vertical axis is H/H 0 (weir height/basic weir height). high). This is only when hd = 0 and exposed radiation.
Graph A is P 0 /H 0 = 1.5, B is P 0 /H 0 = 1.6, C
is P 0 /H 0 = 1.7, D is P 0 /H 0 = 1.8, E is P 0 /H 0
= 1.9, F for P 0 /H 0 = 2.0, and G for P 0 /H 0 = 2.5. That is, as the upstream water depth increases, the weir height changes, but compared to the conventional case (see A), in the case of the present invention, the fluctuation in the weir height is smaller in B, C, D, and E, and F
The case is also approximately the same as the conventional case.
第５図は水膨張式に於いて下流水深と堰高の関
係を示す図で横軸にhd／H0（下流水深／基本堰
高）を、縦軸にＨ／H0（堰高／基本堰高）を取つ
ている、たゞしhu＝1.2Hの場合である。なお図
中Ａ〜ＧのＰ／H0の値は第４図と同様である。 Figure 5 shows the relationship between downstream water depth and weir height in the water expansion type. The horizontal axis shows hd/H 0 (downstream water depth/basic weir height), and the vertical axis shows H/H 0 (weir height/basic This is the case where hu = 1.2H. Note that the values of P/H 0 for A to G in the figure are the same as in FIG. 4.
即ち下流水深が大になれば堰高も変動し、従来
の場合（Ａ参照）は、基本堰高H0よりの変化が
大きいのに対して、本発明の場合（Ｂ，Ｃ，Ｄ，
Ｅ，Ｆ参照）は、堰高の変化が小さい。 In other words, as the downstream water depth increases, the weir height also changes, and in the conventional case (see A), the change from the basic weir height H 0 is large, whereas in the present invention (B, C, D,
(see E and F), the change in weir height is small.
（発明の効果）
以上のような本発明は下記のような効果を有し
ている。(Effects of the Invention) The present invention as described above has the following effects.
上下流水深変動による堰高の変化が小さいので
小出水で頻繁に倒伏することもないし、また高越
流状態の堰体越流振動も避けられ、下流水深の変
動する防潮堰等に有用である。なお堰からの越流
量も上流水深を計測するのみで下式に示すように
簡単に導ける（下式でＨで一定であればhuのみ
を知るとＱが算出できる）。 Since the change in weir height due to upstream and downstream water depth fluctuations is small, it does not frequently collapse due to small flows, and it also avoids weir overflow vibration in high overflow conditions, making it useful for tide protection weirs where downstream water depth fluctuates. . The overflow from the weir can also be easily derived as shown in the formula below by simply measuring the upstream water depth (if H is constant in the formula below, Q can be calculated by knowing only hu).
Ｑ＝Ｃ（hu−Ｈ）3/2Ｂ Ｑ：流量m3／sec Ｃ：流量係数1.7 hu：上流水深〔ｍ〕 Ｈ：堰高〔ｍ〕 Ｂ：河巾（堰長）〔ｍ〕 Q=C(hu-H) 3/2 B Q: Flow rate m 3 /sec C: Flow coefficient 1.7 hu: Upstream water depth [m] H: Weir height [m] B: River width (weir length) [m]
水膨張式可撓性膜製起伏堰を例示する図面に於
いて第１図は堰の基本状態図、第２図は堰機構断
面図、第３図は設計条件を説明する図（図ａ，
ｃ）、および設計条件より下流水深が変動した場
合の状態を説明する図（図ｂ，ｄ）、第４，５図
は本発明を従来と比較しつつ説明する図である。
１……可撓性膜製包被、２……水、３……床
部、４……上流水、５……注排水管、６……ポン
プ、７……排水口、８……サイフオン式安全装
置、９……バケツト、１０……バルブ、１１……
レバー式バルブ、１２……倒伏水位。
In the drawings illustrating the water-expandable flexible membrane undulating weir, Fig. 1 is a basic state diagram of the weir, Fig. 2 is a sectional view of the weir mechanism, and Fig. 3 is a diagram explaining the design conditions (Figs.
c), and diagrams (Figs. b and d) for explaining the state when the downstream water depth varies from the design conditions, and Figs. 4 and 5 are diagrams for explaining the present invention while comparing it with the conventional method. 1... Flexible membrane envelope, 2... Water, 3... Floor, 4... Upstream water, 5... Inlet/drain pipe, 6... Pump, 7... Drain port, 8... Siphon Type safety device, 9...bucket, 10...valve, 11...
Lever type valve, 12...Lodging water level.
Claims (1)
に河川等の床部に少くとも取付け、包被内部に圧
力媒体たる水を送入し包被を膨張起立させ、又包
被内部から水を排出し包被を収縮倒伏させるよう
にした起伏堰に於いて、下流水深が少くとも堰高
の1/2以上まで変動して使用されるもので、基本
状態即ち上流水深＝堰高H0、下流水深０で堰底
内圧P0を1.6≦P0／H0≦2.0としたことを特徴とする 水膨張式可撓性膜製起伏堰。[Scope of Claims] 1. A flexible membrane envelope is attached to at least the floor of a river, etc. in a direction that crosses the flow of the river, etc., and water as a pressure medium is introduced into the interior of the envelope to inflate and raise the envelope. In undulating weirs, which discharge water from the inside of the sheath and cause the sheath to contract and collapse, the downstream water depth fluctuates to at least 1/2 of the weir height, and the basic condition is That is, the water-expandable undulating weir made of a flexible membrane is characterized in that the upstream water depth = weir height H 0 and the downstream water depth is 0, and the weir bottom internal pressure P 0 is 1.6≦P 0 /H 0 ≦2.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6740383A JPS59192116A (en) | 1983-04-16 | 1983-04-16 | Water-inflatable flexible membrane undulating weir |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6740383A JPS59192116A (en) | 1983-04-16 | 1983-04-16 | Water-inflatable flexible membrane undulating weir |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59192116A JPS59192116A (en) | 1984-10-31 |
| JPH0359204B2 true JPH0359204B2 (en) | 1991-09-09 |
Family
ID=13343939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6740383A Granted JPS59192116A (en) | 1983-04-16 | 1983-04-16 | Water-inflatable flexible membrane undulating weir |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59192116A (en) |
-
1983
- 1983-04-16 JP JP6740383A patent/JPS59192116A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59192116A (en) | 1984-10-31 |
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