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There are various types of bridges on the Sumida River, but the first thing that comes to mind is the beautiful Eitai Bridge and Kiyosu Bridge. Both of them are over here in Chuo-ku.

Left: Eitai Bridge and right: Kiyosu Bridge

The bridge that we are building now was built during the reconstruction project of the Great Kanto Earthquake, but it is said that these two bridges were designed in contrast, and the upward arch of Eitai Bridge is powerful and "masculine", The downward curve of Kiyosu Bridge is delicate and described as "femininistic".

When I was taking a virtual walk, the curves of Eitai Bridge and Kiyosu Bridge seemed to be a similar curve, and I had a very strange imagination.

"I think Eitai Bridge and Kiyosu Bridge can be combined."

It's like an old robot anime, but if you reverse the Eitai Bridge up and down and combine the curves of the two bridges, maybe you'll get stuck like Cinderella shoes? It's my imagination. It's a man and a woman, so I don't think it's okay to combine them. 。

I used the design materials of the time taken in the past, such as the exhibition at the Kachidoki / Bridge Museum, to forcibly match it.

I think it was not good. It's slightly off. Because the distance between the pier and the pier is different, I felt faintly that it would not fit. But I think it's a little better.

Here, I looked at the various aspects of the bridge. I searched from the information on the Internet.

[Eitai Bridge]　Bridge length: 184.7m, width 22.0m

[Kiyosu Bridge]　Bridge length: 186.2m, width 22.0m

I was able to pick up the number.

But looking at the numbers written in old blueprints, it's quite different. When I looked it up, I found that it was written in the unit of feet instead of meters.

According to the old blueprint, the numbers in the "branch length" are mainly described, and the total length of the branch is 600 feet for both bridges. The Eitai Bridge and Kiyosu Bridge were the same length.

The length of the branch is the distance between the junction and the junction on the pier and the abutment. Both bridges have two piers, so there are three branches. In particular, you can see that the branch length of Kiyosu Bridge is designed with good numbers.

I'll enlarge it only on the right side.

The length from the middle of the bridge to the junction of the pier is 165 feet for Eitai Bridge and 150 feet for Kiyosu Bridge. It's 15 feet different. In addition, when we simply divide the columns and hanging materials on the vertical line from both bridges by counting the numbers, we found that both are at intervals of 15 feet.

Looking at this, I thought that the place to match the curve of Kiyosu Bridge had to be a part of 150 feet. In other words, the inside of the arch, not the outside of the arch of Eitai Bridge. In the figure ★And ★You just need to adjust the location.

Let's combine it again!

It feels a little deviated, but it looks like it is a combination without discomfort than before.

Moreover, it is beautiful that the vertical line of every 15 feet is integrated, and the outside of the arch of Eitai Bridge is beautifully in contact with the road surface of Kiyosu Bridge, giving it a very sense of unity. And in fact, the width is about the same. I didn't think it would be so beautiful. That's why

"Successful integration of Eitai Bridge and Kiyosu Bridge!

I would like to personally think about it.

It's strange, but if you look at the photos while thinking of this combined figure, you can see Kiyosu Bridge if you look at Eitai Bridge, and Eitai Bridge if you look at Kiyosu Bridge.

I just tried to combine it from a rugged idea, but by doing it, I came to see the commonalities of the two bridges of the Sumida River, and the moment I combined and combined beautifully, the designer at that time for these two bridges I felt like I was able to read the intentions of the two bridges, and I didn't understand well, but I was really impressed.

The Kiyosu Bridge is said to be the most beautiful bridge over the Sumida River. Why do you feel beautiful?

Left: Eitai Bridge and right: Kiyosu Bridge

I think there are various ways of feeling depending on the viewer, but from the blueprints, I felt that one reason was that it was designed with good numbers.

This is Kiyosu Bridge, which cut out 300 feet on the right half of the bridge. Even if you cut it in half, it's a good number. And it is a gentle curve that extends evenly from the top of the bridge tower, but have you seen it somewhere?

I think it's a mountain that everyone in Japan is proud of, and I've heard that foreigners are impressed by seeing this mountain. It is said that this curve is called "hanging curve" in a difficult term, but I think it is probably a curve that humans see and feel very beautiful.

And if you turn this curve upside down, it will be the curve of Eitai Bridge, so it is natural that you will feel beautiful when you look at Eitai Bridge.