This year, Tsukuda Island is home to Sumiyoshi-jinja Shirine, where the main festival is held once every three years.
When you look at Tsukuda digging from the top of Tsukuda Kobashi, you can see the following precautions.
"This place is buried with large banner pillars and hugs that were allowed to be built by Tokugawa shogunate in the late Edo period (1798), so please do not enter or dig up. Sumiyoshi Tsukuda
It is said that the "pillars" of large banners drawn by Hiroshige, which can be set up at the main festival once every three years, and the "daki" that supports it are buried in the water like a time capsule.
Every time I come here to Tsukuda Island and see this note
"Isn't the tree going to rot because it's buried in the water?"
Yeah
"Isn't it okay until now, but it's rotten and gone this year?"
I don't think about it.
That's why the work of digging this pillar and holding tree, which only happens once every three years. I was a little interested, so I saw it (Sunday, July 5).
Unfortunately, it was raining on the day.
This digging starts with digging mud until you can see the buried trees, but just looking at getting your feet off the mud, you can see that it is quite hard work.
Then, the buried trees begin to appear and move on to the work of removing them.
A crane is used to remove the tree. Once the mud is dropped in the moat water, it is lifted to Hashigami.
It's repeated many times.
On the other hand, the work of drilling with pillars is performed separately. There are six large banners, which can be set up in six places, but there is a place where three holes can be drilled per place in advance.
I'll dig up the hole.
After the tree, which was the part of the holding tree, was taken out, the six pillars were removed. It is said that the length is close to 20m.
The young people carry that pillar.
This traditional work, the interval of once every three years may be just right to take over.
And finally, a tree was assembled to make a large banner.
As a result, the buried trees were dug out safely this time, and they were ready to set up a large banner.
According to various research, it seems that the tree needs oxygen to rot, and filling the tree in the water does not let it touch the oxygen.
I don't think old people knew such a theory, but it may have been a very natural knowledge from experience.
Walking along Tsukishima's Nishinaka-dori (Monja-dori) toward Kachidoki, there is a bridge called "Nishinakabashi", which was replaced last year.
It seems that dozens of pine stakes were embedded under the previous bridge, strengthening the ground and supporting the bridge.
The pine stake was dug out during the replacement without rotten, and is now displayed beside this bridge or reused as a wooden bench.
You know that thousands of pine stakes were used under the previous Maru Building in Marunouchi, Chiyoda-ku, and more than 10,000 pine stakes were used as foundation solidification under the station building of Tokyo Station. You may come. It is said that a wooden stake is also hit under the torii gate of Itsukushima-jinja Shrine.
It is called the story of this pine stake, the story of the pillar of the large banner of Sumiyoshi-jinja Shirine, and the head of the "power of wood" and "wisdom of the predecessor" drops.
Recently, liquefaction has become a problem in Great East Japan Earthquake, but the "power of wood" has been reviewed, "thinned wood" has not been used, and it has begun to be used as a countermeasure against liquefaction.
By the way, at the main festival of Sumiyoshi-jinja Shirine, I think that a large banner will finally be set up on the 26th and the festival mood will increase.
I'm really looking forward to it because I haven't seen the big banner yet.