2:05 こう見ると水門って大事やな。 がちすげーじゃん

Not even sure how this got recommended to me but watching this really feels awesome. Nice engineering, Japan! As always.

Lately I've had a strange fascination with Japanese infrastructure. They definitely think outside the box.

Why it is we don’t celebrate engineers and their teams more than celebrities and politicians is beyond me.

小さい頃「こんな橋渡られへんやん」と思ってた。

「台風や高潮から大阪守ってきたのにな…」 好き

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…

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

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.

Japanese cleanliness always amazes me, sure clean streets are one thing but also their buildings and walls like damn this is so picturesque.

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

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。

すげぇあの台風21号の高潮被害防いでたんだ…

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

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

I expected the water force to be in the other direction. That would use the compression strength of an arch and possibly be stronger?

アーチ型はロマンがある

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

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。

50年ももてば十分やろ。

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

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。

批判してる人は最後まで動画を見ているのか…

IMPRESSIONANTE! Talvez apenas a holanda tenha um sistema parecido com este.

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。

next video: go watch the "horizontal" gates built by the Dutch to guard the Netherlands from the North Sea. much wider inlets to protect.

Impressive Engineering....great Vid...thanks from California 2021

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）

どうせならどっちにも倒せる水門で お願いいたします。

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

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.

I've never seen something like this. Amazing engineering indeed.

it seems the almighty algorithm decided that I like arching water gates now, so be it

新しいのが出来てから解体するんじゃないんか？

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!

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。

水門・立こうも大事！ でも「早め避難」が１番大事！

数十年後、ローラー水門は危険だとして、新たな

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.

Magnifique travail, la porte est vraiment utile en cas de tempête

Once again, we are united thanks to the recommendations

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.

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

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。

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.

水門とは聞いてたけど 閉まるとこ初めて見たわ

ここの近所に住んでたけどこれなくなるのか・・・ 悲しいな

incredible engineering with a great purpose.

360億の工事に20年もかけるんか…

20年間で津波来そうやな、、、

I don't know why this got recommended to me but it was cool. Thank you Nippon. Sincerely, a swedish guy.

今までありがとう。

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

アーチの向き逆だったんちゃう？（

My heart broke a little bit. What a lovely piece of engineering. It's shame to hear that it has been removed.

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。

Storm surge barrier. Very impressive engineering. Scale of the mobile barrier is immense!

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

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.

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。

Just an English comment. Btw so elegant watergate.

次を設置してから取り壊さないと駄目。

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

20年かかんの？その間に来るやろ

The official being interviewed is also the guy they send out when Godzilla pays a visit.

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

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

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～！！

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。

20年は長いなぁ

Great Video Would recommend!

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.

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.

めっちゃ胸熱。

dunno how this got recommended but it sure is some cool engineering.

500トン支えるワイヤーすぎょい

Why is the high water on the concave side? I would expect the load on an arch to be on the convex side.

大阪は毎月出張で行くがこんなのがあるのは知らなかったなぁ

nice engineering works from Japan

新しい水門完成してから壊せばいいじゃん

逆向きに倒せば良いじゃん

山ら辺に住むのもありだが土砂崩れがやばそう、判断難しいよね。。

まあ　発想としては こういうデザインは斬新なもので

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.

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。

勉強なりました。授業にもなりますね。

great invention, but what i'm asking just, why the arch go to inside than outside instead ?

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

Don't speak, But I understand perfectly. Japanese ingenuity at it's best, again.

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

どれだけ重くても人力で開けられるようなアナログ式機能を搭載した水門もあってほしいな アーチ型とか見たことないからハイテクだと思ったら50年も経ってるのか

KZfaq recommendations are a bizarre thing.

I love Japan's Engineering as much I love their 'culture' if you know what I mean. eheheh

Auto translate subtitles do a good job. The video is actually quite interesting.

Respect to engineers

Wouldn't it work better as an arch if it was going the other way?

Получил эстетическое удовольствие, наблюдая, как кабели ложатся в направляющие, когда этот затвор опускается.

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?

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