The arched water gate unique to OSAKA, the water city, disappears.
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- เผยแพร่เมื่อ 4 ก.พ. 2020
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th-cam.com/users/MBSnewsCH?s... - วิทยาศาสตร์และเทคโนโลยี
2:05
こう見ると水門って大事やな。
がちすげーじゃん
Onkrfa, it reminds me of *_these mice_* th-cam.com/video/VE6OwKoFSB0/w-d-xo.html&
Not even sure how this got recommended to me but watching this really feels awesome. Nice engineering, Japan! As always.
Godzilla is not impressed.
I was just thinking that and also it's fun to just pretend you understand every single word. I think I heard some city names in there somewhere! Darn closed captioned not working...
@@jonathonseitz7647 After you click the CC button to turn it on, click the gear icon, and select "subtitles/CC" and scroll down to English. Not a perfect translation, but not bad at all. Edit: Just noted another user pointed this out, and that it mightn't work this way on a mobile version of TH-cam.
@@matambale Thank you, I knew I must be missing something. Appreciate that!
@@matambale Thanks !
小さい頃「こんな橋渡られへんやん」と思ってた。
それなw
ああ、観光用として残すのはアリですね。
ただ、可動橋としてはダメかなあ。。
誤作動で閉門したっきりになったらヤバイ。
ただゲームでは重要な移動施設だけどねｗ
小さな頃から関西の賢いお子さんらしい
ツッコミ形式の疑問ですね笑
素晴らしい
@@user-yz6qj1ek5k なんか話変わってね？w
可愛い勘違い
「台風や高潮から大阪守ってきたのにな…」
好き
この門は無くなるんじゃない。次の姿に変わるだけさ
Odaexa, it reminds me of *_these mice_* th-cam.com/video/VE6OwKoFSB0/w-d-xo.html&
よく渡船場を使って川を渡る時に見ていた景色なのでこれが無くなるのは少し寂しい…… でも大阪を守るためなら仕方ないか……
Lately I've had a strange fascination with Japanese infrastructure. They definitely think outside the box.
It reminds me of *_these mice_* th-cam.com/video/VE6OwKoFSB0/w-d-xo.html&.oojha
3 billion yen cost though, account for inflation
Whe had tese in the Netherlands for some time now nl.m.wikipedia.org/wiki/Stuw-_en_sluizencomplex_Amerongen
Actually, the engineers decided to dismantle this. It will not protect. Watch til the end!
@@quoc28mytube only because it's old and times are changing. Storms and storm surges are more powerful because of global warming. However, for the 1970s it's a really cool bit of engineering.
子供の頃、毎日この水門を見てすごしました
北津守のシンボルだったこの緑色の水門がなくなるのは本当に寂しい限りです
本当に50年間お疲れさまでした
そして北津守出身者にはいつまでも心の中にこの水門の風景は残っているでしょう
北津守出身。
家から見える。
なくなるんですね。
なんか寂しいです。
It's sad to see it go, it did a great job 🇦🇺
Oyeqya, it reminds me of *_these mice_* th-cam.com/video/VE6OwKoFSB0/w-d-xo.html&
手前に水門作ってから壊さないと、
タイミング悪かったら…
んだよ？はっきり言えやチー牛
確かに、先にローラー式作ってからだよね
20年後にはトラフ地震発生してるよね
この関係、終わりにしましょう
@@chosunhi
そんな事も分からないなら、黙っておいた方が良い（笑）
かっこ悪（笑）
@@chosunhi
え、死にたい以外のコメ初めて見たわ
こりゃ珍しい
すげぇあの台風21号の高潮被害防いでたんだ…
Why it is we don’t celebrate engineers and their teams more than celebrities and politicians is beyond me.
As someone who sucks at math, I have immense respect for engineers.
come to the Netherlands here our engineers are glorified like no other. They keep us dry.
Most celebrities lives aren't worth celebrating. When you turn the TV off they vanish.
Bernie bros we got goo cocky.......
@Skelley-Priest They sure can.
Architects do advertise there work.
That is how you get new clients.
In the end every company that makes anything or provides any service that is not a state run company will have to advertise there business to there costumers. or be very lucky it can only operate on costumers being there advertisers.
A company that makes door handles will advertise there door handles to companies that make doors.
a company that makes bridges and other big infra structure will advertise to there idea to there client.
why do you think that there are so many conventions for so many business worlds.
that is there big advertisement campaign.
このようなアーチ型が大阪市にあったなんて初めて知りました。
長い間ご苦労様でした。
大阪って街中散歩していて、急に明治大正感な建造物見つけて調べたら、貴重な建造物や遺構だったというのが多いので勉強になります。
津波で押し流されるより大雨で浸水の方がマシじゃない？
完成までは残しとこうや
場所とかの問題なのかなあ...
当然、新たなものを作りながらの解体になると思いますけど。
予算の制約があるとはいえ南海トラフを想定して20年後完成は余りに遠いなあ
こういう時に臨時予算を下さい出したいと言い難いのが
日本の行政の一番の問題だよねえ
いつ災害が発生するか分からないwww
南海トラフ(に限らず地震)は何回でも来るし予測も出来ないからなぁ
予算のせいではないと思いますよ。専門家ではないのでよくは分からないのですが3大水門のような大きさの水門では工期が5年以上のことが多く7年の工期は決して長くないようです。311で壊れた水門の復旧工事を急いだ発注方法をした結果計画の見直しが何度も発生したりで費用も工期も倍増したなんて酷いことになった前例もあるので丁寧に進めることはいいと思います。それに加えて大阪府の津波対策において三大水門の更新はかなり高い優先位置にあってさらに早急な工事が必要と知事答申があるので予算がかかるからと軽んじられたり先送りされた結果の20年ではないと思います。
@@bt-4226 311では土木需要が過大になりすぎていて予算よりも建設作業員の確保などがボトルネックになっていたので、平時の更新の参考として引き合いに出してくるのは不適切。
こんだけでかいやつなら地盤の調査とか設計とかもあるだろうし予算あればはやくなるってもんじゃないやろ
やり替える間に南海起きる確率高いから作りながら残しとくのが一番だけどな。ないよりはましだから
@@bt-4226 調べて頂いてありがとうございました。
ありよりのあり？
別に作って壊さなくてもいいと思う。土地不足なのかな？
正味南海トラフなんか来たらみんな死ぬから関係ねえけどな
確率は低いだろ。
何気なく見てた景色だけど、こうやって解説を聞くとまた改めて見てみたくなるな
It reminds me of *_these mice_* th-cam.com/video/VE6OwKoFSB0/w-d-xo.html&.iaofa
Ohrxpa, it reminds me of *_these mice_* th-cam.com/video/VE6OwKoFSB0/w-d-xo.html&
アーチ型はロマンがある
わかる
カンカンヘッドは？
@@user-yu1bs7rk2g 誰もそんなこと言ってないよ
@@user-yu1bs7rk2g 救えます（錯乱）
@@user-yu1bs7rk2g さん、
いままで救ってきたかと。
今の問題は「巨大津波時にアーチは負ける可能性」
「電源喪失時に稼働できない」なんで。。
43号からみるとこの水門ユニバを跨ぐ形で見えるんだよなー。大阪でも好きな景色の一つ
見てみたいです！
Japanese cleanliness always amazes me, sure clean streets are one thing but also their buildings and walls like damn this is so picturesque.
молодцы китайцы все могут все умеют! удачи им!
cost of living and rent are astronomical, and your astronomical rent gets you a closet. Few landlords will rent to foreigners. They may be polite because culture, but prejudice against non-Japanese is prevalent. Forget about opening an in-country bank account if you are a foreigner. People smoke EVERYWHERE including bars, coffee shops and public spaces. The whole regious is prone to frequent natural disasters. Yeah, it's a real land of milk and honey.
@@railgap Bruh, while what you said is not wrong, the guy only said it looked clean and pretty. why do you feel the need?
@@matthewc9934 maybe he just had a bad experience in Japan
@@railgap nah, they dont give 2 sh!ts about foreigners. What did foreigners do to their country to be praised high enough in their community? They arent America. They are better off without extraterrestrial self proclaimed tourists anyway.
学説によると10年内に南海トラフの可能性がでているらしいけど、
20年じゃ間に合わないし、そもそもその状況下で果たして
水門以外の所の補強も間に合うのかどうか。
なんとしても最小限の被害で抑えるように逐次対応をとってほしい。
大阪は南海トラフによる被害が1番大きくなるらしいですね。自分は南海トラフ地震圏外住みなんで関係ないですが
本物やん！
政府だけでなく国民が政府に協力して早く避難できるかにもかかっていますね。この間の地震の際も大人より子供の方が危機感持っていたので。国民の意識が下がってきてるのでは？とも思いました。
@ノーネーム ですね。お互い気を付けましょうね
こんなところでアナタを見るとはｗｗ
北海道も大きな地震がある可能性があるけどどういう対策とってるのかな
In Japan, experts tell the government, "Hey, you should fix this aspect of your infrastructure before it becomes a problem" and they fix it. Meanwhile in America states ignore cracked bridge supports for years and let contractors stress test new bridges without closing the road underneath.
Thats because thats public spending, and Americans 1. love to privatize everything and 2. would rather buy 15 fighter jets than fix roads.
Then there China and their tofu dreg project oof
@@FORRESTtheunoriginal I'm an American and I can wholeheartedly agree I mean seriously I'm surprised why so many people want to get in to this crappy country.
too much bureaucracy and redundancies in the worst places. regulation is important but we implement it in the worst ways possible that ends up cutting corners and makes it even harder to undo mistakes. America is that land of good intentions and terrible execution, and the bigger the plan the worse failure. plus japan can say "hey this policy is a mistake for these logistic reasons" and act accordingly while questioning a policy in America is taken as a personal attack on those who support it
@@FORRESTtheunoriginal private jet and private heli are always something
50年ももてば十分やろ。
しかも水に触れてる物だしね
流石日本
360億掛けて水門作る必要ないね。住む人間の自己責任。
@@user-sq5sk6op3c そんなこと言ったら住める土地結構減るからなお前
@@user-sq5sk6op3c その考え方は頭悪いよ？
@@user-sq5sk6op3c 名前可愛いな
I expected the water force to be in the other direction. That would use the compression strength of an arch and possibly be stronger?
yeah, this is what I thought too. However, I think steel is stronger under tensile loads - i.e. more difficult to pull apart than it would be to compress.
@@timeluster No. Steel is isotropic
@@ALIEN101994 Isotropism has nothing to do with it, or nobody would have ever drawn Mohr circles for isotropic materials. Virtually, steel would resist infinite stress under hydrostatic compression... But you'll heave a hard time going over 2000 MPa in pure tension.
I suspect this has a lot to do with the fact that this gate had to be able to be activated under its own weight. But from a strength point of view: yes, the opposite would have made more sense to me (maybe I'm missing something, though).
I think the answer to that lies at 3:32
批判してる人は最後まで動画を見ているのか…
みてないんやで、こういうやつらは「見ないで低評価」とかすらするしな
不謹慎だけど、世の中には災害で人が亡くなられてる動画を内容も見ずに低評価押すやつだっているんやで。
皆さんお気づきだろうか…
津波が発生したとき、誰かが水門の操作に足を運ばなければならないことに。
3.11の時も命を賭けて水門を閉めに行った消防団員が多く亡くなりましたね。
なので現在は一級河川の水門などは
遠隔操作できるようにどんどん改修されていってます。
@@kzrymngw4279 でもそうすると電動になって災害時には操作が…以下無限ループ
？？？｢お前らは先に行け！！ここはあたしらが食い止める！｣
@@user-fe7te1ij4y 水門前まで足を運ぶ職員を憂いてるんでしょ
@@user-fe7te1ij4y
確かにそうですね。言葉足らずですみません m(._.)m
最近は自動開閉樋門という電力に頼らない水門もありますね。
近所の樋門(堤防に付いている水門)の例なのですが、
以前は、大雨の時に川の水が民家の水路に逆流しないように当番がハンドルを回してゲートを閉じていました
でも最近工事をして、
川の水位上昇で勝手に動いて閉まる自動開閉式になりました
危険な水門当番が無くなって本当ありがたいです
アーチが何をするのかと思ったが、倒すシーンでようやく分かった。
いや、サムネで理解できる代物だろ…
理解力弱くね？
@@user-pf3qp2oj3j 理解力とは
@@user-pf3qp2oj3j くそっwww腹立つww
@@user-pf3qp2oj3j 煽ってる時点でお察し
@@user-pf3qp2oj3j 失礼な人
新しいのが出来てから解体するんじゃないんか？
IMPRESSIONANTE! Talvez apenas a holanda tenha um sistema parecido com este.
Obtzma, it reminds me of *_these mice_* th-cam.com/video/VE6OwKoFSB0/w-d-xo.html&
どうせならどっちにも倒せる水門で
お願いいたします。
Oviowa, it reminds me of *_these mice_* th-cam.com/video/VE6OwKoFSB0/w-d-xo.html&
Impressive Engineering....great Vid...thanks from California 2021
Strange the arch is concave on the 'upstream' side; the opposite of any dam. 3:36 is an illustration of why dams are built that way.
exactly my thoughts! I don't get the design
Yes, I am really surprised that it was built that way - it really makes no sense to me. But there must have been a reason.
I think you got it wrong, it's concave downstream. They put this into perspective at 3:41. Also saying that that the concavity downstream is a problem when dealing with tsunamis.
I thought the same!
@@alexandrerodrigues2181 He didn't get it wrong. 2:04 you can see while the gate is operational i.e. holding surges from the sea, it IS concave on the upstream side.
水門とは聞いてたけど
閉まるとこ初めて見たわ
I've never seen something like this. Amazing engineering indeed.
Osunla, it reminds me of *_these mice_* th-cam.com/video/VE6OwKoFSB0/w-d-xo.html&
next video: go watch the "horizontal" gates built by the Dutch to guard the Netherlands from the North Sea. much wider inlets to protect.
Aren't most of those scheduled to be demolished/decommissioned in the next 20 years?!
@@_Teorias_ No, just modified. The arche bend barrier is also copied from the Dutch, they had those back in the 1950s already.
Ogjkra, it reminds me of *_these mice_* th-cam.com/video/VE6OwKoFSB0/w-d-xo.html&
アーチ型水門は景観的にも良かったが、
南海トラフの地震を想定した時には実益性が優先されるということかー、仕方ないね
外側に突き出してると思ったらモロに水圧かかる方向にアーチしてたｗ
俺もこの動画みるまで同じ事思ってた。
閉まってる状態見たことなかったから…
川→海を想定してるからな、、海→川の津波は想定してない
@@oops6413
川→海は要らないでしょ。そもそも満潮の時に逆流を防ぐ為のものなんですから
逆だったら波来たときに円の端から外に溢れるからじゃないか？
Oebdaa, it reminds me of *_these mice_* th-cam.com/video/VE6OwKoFSB0/w-d-xo.html&
Magnifique travail, la porte est vraiment utile en cas de tempête
水門・立こうも大事！
でも「早め避難」が１番大事！
もっといいのは移住
関西から離れたくないのなら
奈良県に。
大阪府下だったら吹田や箕面、東部の高台
@@karateru
それが一番 危険なエリアから離れろ
As a Dutch person... I'm a bit confused... this model was designed in the Netherlands at the end of the 1950's to control the flow of water downstream of a river. Specifically for inland waterways/rivers, not as a storm surge barrier for a typhoon or tsunami protection. Although this version looks considerably beefier then the ones still in use in The Netherlands. I guess the knowledge back then was simply less.
I am confused about how the river doesn't back up and overflow.
いろいろな技術や経験の積み重ねがあるから時代とともに作り変えるのだろう。
I don't know why this got recommended to me but it was cool. Thank you Nippon. Sincerely, a swedish guy.
I don't understand anything what they are saying about that dame, but it's seems interesting, wish I could understand what's going on. (From pictures I can see that it's some emergency, anti-flooding system). Greetings from Poland!
Basically what you are imagining. I'm not fluent in Japanese yet, but from what I got, the Roller Gates are essentially flood gates to regulate flooding in the 3 biggest rivers of Osaka. This is to ensure the entire city doesn't get flooded during massive storms such as typhoons or even tsunamis. Osaka's location between these three rivers makes it incredibly vulnerable to flooding and this can be seen in the past before the gates were built.
1. Click the CC button, gear icon, Autotranslate, gear icon, desired language.
@@Mavrik9000 Yes, the English translation was pretty good. A few oddities but pretty understandable for the most part. Sad to hear that they're going to demolish such interesting pieces of engineering but I guess they must.
@@Mavrik9000 i tried, but either it takes a while to be translated, or it doesnt work for japanese to english or german :-(
@@knuffelbaer1971 It worked for me for English.
it seems the almighty algorithm decided that I like arching water gates now, so be it
Water gates meta?
Oopeaa, it reminds me of *_these mice_* th-cam.com/video/VE6OwKoFSB0/w-d-xo.html&
20年間で津波来そうやな、、、
逆に倒せたらトンネルの要領で津波にも多少対処できそう（小並感）
同感
その場合、水門は耐えられるけど、流れの力がすべて左右に方向をかえられて、水門以外が壊滅しそう・・・
同じくそう思いました。
でも根本？の構造が一定方向にしか曲がらなかったり、ワイヤーの巻き取りとかも反対側にやり直したりしそうで大変そうですね。いっそ新しいの作っちゃえ！ってなったのでしょうね。
1970年に作った人が逆に倒せるよう作っていれば、作り替える必要はなかったんだよね。税金を使ってまた新しいの作って 結局災害は防げなかったりするのかもね。考えている事が幼稚なんですね😆
当時は津波の危険性が今ほど認識されてなかったのでは
①アーチ水門の厚みの補強 ②非常電源の設置 ③油圧の2重系
④開閉ロープ用重力バランサ（円弧式カウンターウェイト）追加設置
そうそう、こういう改修工事でいけそうだよね。
@@masakiizawa5754 いけないから新規に作ると言ってるんでしょうね
一つの川を一つの水門で護ってるのもリスクが集中しすぎるって事なのでは？
例で挙げられていた他の水門は３つのゲートで構成されていたよね。
一個ダメになっても他の２個は開閉できるなら少なくとも水は流せる。
No idea why this was recommended to me but I found it interesting all the same. It's kind of a reverse version of the Thames Barrier in London, only those gates come up from the bottom. The idea was based on how a ball valve works.
Ozjoea, it reminds me of *_these mice_* th-cam.com/video/VE6OwKoFSB0/w-d-xo.html&
数十年後、ローラー水門は危険だとして、新たな
水門を建設するために、必要とされる予算が
け、建設が...遅...れ
ｳｵｵｵｵｱｱｱｱ\( 'ω')/ｱｱｱｱｱｯｯｯｯ!!!!!
一時的に建設を中断することに
当たりそうだから今のうちにコメ残しておこう
充電切れてて草
It is interesting that the gate is arched away from the high water flow direction resulting in a weakness as the force of water tends t push the gate halves apart and not against it giving a stronger structure (as in dam construction). Also seems illogical to have a join in the centre when the whole structure moves as one anyway
When I first looked at the arch, I thought it would be lowered so that it would protrude in the direction of the incoming water, instead of the other direction. It would seem to be stronger that way. Any thoughts?
Once again, we are united thanks to the recommendations
Ojthqa, it reminds me of *_these mice_* th-cam.com/video/VE6OwKoFSB0/w-d-xo.html&
水門好きとしては壊される前にぜひ見ておきたいところ
Then I noticed how old this story is!!! Wonder what they did do?
My heart broke a little bit. What a lovely piece of engineering. It's shame to hear that it has been removed.
解体せずとも
2つ目を作ればいいんじゃ!?
砂防ダムとか3重4重になってるよね
内容見ましたか？
動かなくなるのがまずいんです
内容見たのですが、アーチ型が破損・電源の問題で開かなくなる問題が起きる可能性があるのに対して、ローラーゲート型は電源は無くても自重で閉めることが出来る、って対比になってないですよね。
様々なタイプの水門や淀川などの防潮鉄扉の"建設"と"実運用"実績のある大阪のデータは貴重。利点と欠点が後に活かされる。
incredible engineering with a great purpose.
落ち着いた雰囲気の大阪に関する画像を初めて見ました。
アーチ橋やアーチ式ダムの原理を知ってると
『閉める方向が逆じゃね？』
と思うのは私だけでは無いはず
逆に閉めたら津波にも強そうとも思うはず
次を設置してから取り壊さないと駄目。
今までありがとう。
今までこの水門に大阪の街を守られてきたから、感謝この上ない。大阪の誇りやわ。
次の水門も、大阪の街をしっかり守っていただきたいですね。
工事中は、ちょっと守りが手薄になるかも知れないけど、早めの避難をするのが、大阪人の機転やね。
Why is the high water on the concave side? I would expect the load on an arch to be on the convex side.
I was wondering the same thing.
Was just about to comment the same thing lol...
Because it was designed by an arch villain.
Inside was a river while the outside is the sea.
Think of a suspension bridge. That is also an arch, but all in tension, making much greater spans possible with the use of far less materials. The dams you are referring to are concrete or stone dams, which are stronger in compression. This is a steel dams, and so the arch in tension is a more efficient use of materials
人間じゃないのに何故か人間のように見えてしまう。偉人だ
Ofqlma, it reminds me of *_these mice_* th-cam.com/video/VE6OwKoFSB0/w-d-xo.html&
TRANSLATION: Osaka has developed along the sea and rivers, and is known as the city of water. For many years, sluice gates have protected the city from the inevitable storm surges caused by typhoons. Arch-shaped sluice gates have been installed in areas where the river is particularly wide. They are unique to Osaka, but they are about to disappear.
(Broadcast on February 5, 2020, MBS TV "News Mint! From "What You Need to Know! from "News Mint!
good designs i hope to see the problem with rising river levels when the gate is closed fixxed with a complimentary system to redirect rising water
Very glad to see that Japanese were able to rebuild after Godzilla caused so much damage throughout the late 60s all the way in to the late 90s.
lol
めっちゃ大変でした()
20年かかんの？その間に来るやろ
二十年後にも言ってそう
@@user-lq4wf7km9u 何いってんだ
@@user-jf4kk9uo8o 理解できないのか...
ポチ 化石燃料もそうだけど、あと三十年で終わる的なことを四十年前くらいからずっと言ってるんやで
@@user-jf4kk9uo8o 何言ってんだ
Great Video Would recommend!
ここの近所に住んでたけどこれなくなるのか・・・
悲しいな
360億の工事に20年もかけるんか…
ドカーンと行こうぜ
殆どが用地買収期間
工事期間は3年〜6年かな
アーチ水門も予備に残しておけば？ まずローラーゲート水門で堰き止め、それでも越流する水をアーチで受ける。水勢が下がれば、次に開かない不良が出ない･･･とは言い切れんか（トーシロす ｻｰｾﾝ）
それともう一つ疑問なんだが、なんでアーチは左右分割なのか。溶接して一体化したらいかんのだろうか。
動画見る限り左右分割でなく、中央で溶接なり別の方法なりで接着してるのでは？
全部一体物にすべきという意味合いなら、これだけのサイズの一体物を製作するのは困難かなと思います。
中央部は左右ワイヤー上下の歪みの逃げ場所として機能していると考えるのが妥当かな
Is the seam in the middle because of manufacturing limitations? I can't think of any reason to put that there, especially given that it's a weak spot in a very important location that they specifically cited as a reason for its removal.
お疲れ様でした
When there is a tsunami, only close the arch dam part way. Lower it to leave 1 meter of space below it. If it gets jammed and won't move, the runoff water can still get under it and run out. The tsunami can't get under fast enough to do the most damage. There will still be flooding from the tsunami, but the arch dam will not trap the water in.
Coudnt tsunami just lift it if its not lowered enough?
@@vytisagafonovas3887 That would depend on the strength of the joints. If it a gap below the gate during tsunami, I think the most likely scenario would be the joints to break, adding the gate itself as one of the debris that the tsunami brought into the city.
Just an English comment. Btw so elegant watergate.
I AGREE, HI FROM RUSSIA
勉強なりました。授業にもなりますね。
I wonder I wonder if there would be a cheaper solution to the tsunami problem then simply replacing all of it. For example, if the problem is just the seam, why not weld an additional metal plate? Or if that won't work, what if they could rig the thing to turn the other way? I mean, it's obviously physically built to only lower in One Direction, but if it could be turned around in the event of a tsunami that would change the way the water flows into it. Alternatively, what if they just added a new tsunami gate at one point and continue to use the other Gates for any water that gets over the tsunami gate? And then adding some kind of bypass for water to get around in the event of mechanical failure, which really they should have done anyway.
An arch has the greatest strength when the load bears down towards the top of the arch. I wonder what led them to reverse the structure so the force of the water would push on the sides towards the top. This seems to me to completely negate the structural advantage of the arch. It's opposite to the way dams are built. Had they built it the other way around the force of the water would press the seam at the top together, not apart.
Oeiuya, it reminds me of *_these mice_* th-cam.com/video/VE6OwKoFSB0/w-d-xo.html&
Strange that they made the arch the opposite way you would expect as all the force in a storm surge or tsunami will come from the sea and they have the inside of the arch towards the sea making it weaker.
I was confused about that as well, but apparently it has to do with installing the supports for when the arch is down, and those have to be on the river-side.
Onzqva, it reminds me of *_these mice_* th-cam.com/video/VE6OwKoFSB0/w-d-xo.html&
This might just be me, but did anyone else hear "lower the blast doors, Lower the Blast Doors!" when they watched this?
Also, subtitles at 4:55 read "by 20 years, OSAKA will spend about 360 Circles to rebuild everything into a roller gate type"
360 circles? When was a geometric shape a unit of payment, and how can I get some?
Thans for subtittles!
Storm surge barrier. Very impressive engineering. Scale of the mobile barrier is immense!
Odroxa, it reminds me of *_these mice_* th-cam.com/video/VE6OwKoFSB0/w-d-xo.html&
新しい水門完成してから壊せばいいじゃん
Auto translate subtitles do a good job. The video is actually quite interesting.
No auto-translate subtitle option selector found. Please tell me how to turn on that feature.
nice engineering works from Japan
Wouldn't it work better as an arch if it was going the other way?
No.
@@pauldailey4477 why?
@@tigrosabertooth4757 You are not the original questioner. Are you very sure that you do not understand? Because they did explain it and it is quite simple. Listen closely and if you still have a question, then I will answer it for you. Because you are the only believer in dinosaurs that can point to one that might have existed. You are a smart little fella with belief in the old testament.
水門を倒す方向を逆にした方がという意見ですが、アーチの頂点を海側に倒し津波を堰き止めようとした時、水門の両端部・操作室の有る部分に大きな力が作用します。
その場合、現在のままでは力に耐えられず付近の堤防ごと破損すると考えられます。
また津波の力に耐えられるような端部の構造物を作ろうとすると、堤防の大きさ・費用は巨大なものなります。
設計、運用実績があり、建設費用が相対的に安いローラーゲート式水門に作り替えるのは公共工事として妥当な判断では無いでしょうか。
アーチの力に対して引っ張り側の力を持たせる方が構造的には難しいと思います。工費的にもそれは同じです。おそらくですが氾濫時に両脇に少なからず被害が出るのを嫌ったのではないでしょうか。
@@KH-rn7et
アーチの力学的な特性についてはK H様の指摘の通りかと思います。
私の意見はあくまでアーチの頂点を海側に倒した時、現在の設計では津波の力に耐えることができないのでは無いか？と考えたものです。
また以下、現場条件、設計上の制約等分からない状態での私の考えですが、
水門がアーチ構造をとった理由
・水門施工当時、現場は船舶の往来が多く水面上に大きな高さ・河川中央に大きな幅を確保する必要があった。
アーチの頂点が上流側に倒れる理由
・水門を境に、管理部門が分かれており、河川課の管理する水門構造物を海に倒すことが出来なかった。
と言った理由からアーチ構造、閉門動作方法が決定されたのではないかと考えてます。
映像内で、河川側水面より5mも海面水位が高い状態でも水門に問題がなかったことから、何故高潮に対しても不利な方向にアーチを倒すのか不思議に思っております。
何かご存知の事柄がありましたれ御教授頂けますと幸いです。
長文失礼致しました。
@@24okojyo77
やっとわかりました。
海側の水よりも川の流れに対応するために設計したのだと思います。南海トラフ地震が割と最近になってこれは大変だと騒がれだしたのでそもそも当時の設計として津波が含まれていなかったのだと思います。
great invention, but what i'm asking just, why the arch go to inside than outside instead ?
阪神高速湾岸線から見えるから、存在は知ってたが…
予想GUYの挙動で、心底びっくりした！！ すっげぇ！、マジですっげぇ～！！
木津川の水門に限って言えば横に逃がせる水門があるので川の増水が氾濫につながるということはなさそうですよね
電源喪失で動かないなら発電機を設ければ良いじゃないか？とか
継ぎ目の弱さは果たしてどの程度なのか？とか
継ぎ目が弱いなら強くすればいいじゃないか？とか
ローラー式では船の運行はどうするのか？とか
よくわかりませんね
懐かしい
生まれ故郷で良く見る大正区内のランドマークの一つ。
木津川水門は場所が特殊な所で行くことも目の前で見る事もなかったけど、尻無川は大正駅から千島や北恩加島、小林などに抜ける時に使う広くて走りやすい道沿いにあったから、よく見ていた。
これが無くなるのは寂しいな。
It reminds me of *_these mice_* th-cam.com/video/VE6OwKoFSB0/w-d-xo.html&.yiyra
I was in Osaka around 10 years ago or so when the remnants of a typhoon, downgraded to a tropical storm went through. I was in the Marriot on the harbor and it was both interesting and a bit scary for a fellow who usually does not go through such things, and those winds were maybe half of a full typhoon. I missed out on getting to explore Osaka as much as I would have liked as I was only there a couple of days, but it was still interesting to see. I did not get to examine the flood gates or see them in action. I saw the aftermath of the Tsunami in Sendai during that trip, and there was an aftershock in Tokyo while I was there that left me a bit queesy as I looked out and saw the buildings across from my hotel swaying relative to the one I was in, though none of the locals seemed to have any concern there.
ばか
It's a known problem that Japanese have grown too complacent in regards to earthquakes
I do not understand a word, but from what i see, the gate is build in the wrong direction? Normally every dam is build in that way that the curve points to the higher water, so the force is lead as a pushing force to the foundation at the side left and right.
Here it looks like the water pressure pulls at the bearings?
20年は長いなぁ
why not just make the gate fall to the other side? that way the arch will send the whole impact force to the roots of the gate, they'd need only to reinforce them
Steel is not as strong under compression as it is under tension.
@@mabriff Steel is isotropic
dunno how this got recommended but it sure is some cool engineering.
めっちゃ胸熱。
The official being interviewed is also the guy they send out when Godzilla pays a visit.
Yes he is....
I'm from the south, down here we say Godziller.
They probably built that barrier to protect the city from the aftermath of all them monsters, evangelions, angels, devil fruit users, ninjas, quirk users and freelancer samurai!
WOW !
Universal Studios Japan(Osaka) had a 3D theater show(normally Shrek 4D) called "Godzilla: The Real 4D" attacking Osaka and ending up next to the theater. One of the coolest experiences.
逆向きに倒せば良いじゃん
それな、なんなら開いた時に円形なるようにもう一個作れば
同じことを考えたｗｗｗｗｗ
津波なめたらだめよ
@バーバパパ 急に堅くて草 なんか正論＝絶対正義とか思ってそう（偏見）
@バーバパパ 思い付きって案外大事よ
The Japanese are very brilliant and resilient...素晴らしいビデオ、私は多くのことを学んだ、ありがとう
Please forgive my ignorance -- I am no engineer by any stretch of the imagination -- but would someone be so kind as to explain why the arch is not lowered in the opposite direction? Wouldn't water hitting the top of the arch be better deflected, rather than pressure the seam from the inside out?