Akinomaki

Dohyo soil standardised

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After complaints by rikishi about the slippery dohyo at regional basho, the NSK has decided to use the same soil everywhere. It is tradition to use local soil if possible, also for jungyo and overseas events, but now the Saitama soil will get transported to Osaka, Nagoya and as a start this year's Kyushu.

On 1/9/2016 at 16:23, Akinomaki said:

In Tokyo one third of the soil of the old doyho is used, which disappears underground after the basho ends. Now brought up again it gets demolished at first. About six 2ton-truck-loads of new soil is brought from Kawagoe-city, Saitama. The weight of the finished and watered dohyo is about 40tons. http://www.sanspo.com/sports/news/20160109/sum16010908000001-n2.html

No old dohyo there, so the whole soil gets transported by trucks - the papers claim it to be about 45tons - I wonder about the weight difference: 2/3 are 12tons and dry 45 turn into wet 40 tons?

The Tokyo Arakida soil is said to by sticky and it won't show large cracks that easily - the recent Nagoya dohyo-slide was one main factor in this decision. Going west, more and more red clay is in the soil used for the dohyo, which makes it slippery. The original Arakida soil found at river beds in Tokyo is depleted, the NSK took the soil at first from Abiko, Chiba, from Natsu 2007 to Hatsu 2015 from Tochigi and now from Kawagoe.

Chief of operations, NSK no. 2 Oguruma: "Never say again I slipped."

http://www.asahi.com/articles/ASK8Y5418K8YUTQP01S.html

http://www.sponichi.co.jp/sports/news/2017/08/30/kiji/20170829s00005000191000c.html

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Edited by Akinomaki
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Why do they only recycle 1/3 of the soil?  If they've had to change where they get the soil from, I'd think they'd try to save as much as they can.

This reminds me of the fact that there's some special mud that they apply to baseballs before each professional game, and it's all supplied by one guy who gets it from some place secret, passed down in the family to those who want to continue the business.  https://en.wikipedia.org/wiki/Baseball_rubbing_mud

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So, according to this site: http://web.archive.org/web/20120605203432/http://sumo.goo.ne.jp/ozumo_joho_kyoku/shiru/kiso_chishiki/mame/dohyo.html

40 tons of clay (brought by 4 10ton trucks) are for the shape then another 10 tons are for the surface. From the article I'm not entirely sure what they mean by surface. This picture: https://blogs.yahoo.co.jp/koguma_bb/GALLERY/show_image.html?id=47013891&no=11 where there is a bunch of clay surrounding the already finished dohyo, maybe they get extra?

Anyway this matches with the previous 40 and 45 ton claims depending on how you count. I think there is something wrong with the 6 2ton trucks because a big delivery of clay using small 2ton trucks seems really silly.

And disappears underground means it literally goes underground, it appears its on some sort of elevator (I guess some of you already know this but I didnt!):

photo_3.jpg

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5 hours ago, Tsuchinoninjin said:

So, according to this site: http://web.archive.org/web/20120605203432/http://sumo.goo.ne.jp/ozumo_joho_kyoku/shiru/kiso_chishiki/mame/dohyo.html

40 tons of clay (brought by 4 10ton trucks) are for the shape then another 10 tons are for the surface. From the article I'm not entirely sure what they mean by surface. This picture: https://blogs.yahoo.co.jp/koguma_bb/GALLERY/show_image.html?id=47013891&no=11 where there is a bunch of clay surrounding the already finished dohyo, maybe they get extra?

Anyway this matches with the previous 40 and 45 ton claims depending on how you count. I think there is something wrong with the 6 2ton trucks because a big delivery of clay using small 2ton trucks seems really silly.

And disappears underground means it literally goes underground, it appears its on some sort of elevator (I guess some of you already know this but I didnt!):

photo_3.jpg

There are three large square plates: the one the dohyo is built on, another of equal size underneath it, and the one to the rear of the dohyo At the press of a button, the dohyo one is lowered below surface level (as seen in the photo). another press and the rear plate moves forward and covers the hole over the dohyo while the plate previously under the dohyo moves backwards and up, to fill the empty space. This happens, for instance, before the February event of the Choir of 5,000 singing Beethoven's 9th. For this, the orchestra sits on the plate above the dohyo. When the dohyo is needed again, the whole process happens in reverse. 

Of course, this mechanical process was put in place only in the present Kokugikan, which opened in January 1985. At that time I was writing for all kinds of papers and magazines (and also sang in the Choir of 5,000) so I took every opportunity of learning about this -- and when possible, actually being there. 

Orion

Edited by Orion
typos
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15 hours ago, Gurowake said:

Why do they only recycle 1/3 of the soil?  If they've had to change where they get the soil from, I'd think they'd try to save as much as they can.

The paper mixed that up. After looking it up in the NSK sumo daijiten I knew what to search for, this page lists those information, which it got from this TV program: http://www.dailymotion.com/video/x4h28df that shows it all

The foundation gets completely reused (2/3), about 20 cm are scraped off from the surface (1/3) and only 8 tons of new Arakida soil are used (the paper wrote 2/3 get replaced, but actually 2/3 remain)

The surface has to be removed because of the salt, it prevents the dohyo to get hardened to meet the regulations:

The soil gets hardened so much that shiko stamping leaves no footprint, then sand is brought in (dohyo rules article 2 http://sumo360.wiki.fc2.com/wiki/相撲規則)

About other reuse: apparently elsewhere the whole dohyo soil gets thrown away after the basho (jungyo as well), except in Nagoya, where the people take it home as souvenirs of "sacred" soil.

Edited by Akinomaki
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On 8/30/2017 at 15:11, Akinomaki said:

After complaints by rikishi about the slippery dohyo at regional basho, the NSK has decided to use the same soil everywhere. It is tradition to use local soil if possible, also for jungyo and overseas events, but now the Saitama soil will get transported to Osaka, Nagoya and as a start this year's Kyushu.

And today the soil was brought to the Fukuoka Kokusai centre - about 60 tons in 5 truckloads - lifted onto the dohyo by heavy machinery in bags of 1 ton.

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Kyushu responsible Sakaigawa: "Now the rikishi definitely can't complain any-more."

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7 hours ago, Akinomaki said:

Kyushu responsible Sakaigawa: "Now the rikishi definitely can't complain any-more."

I'm sure someone will anyway.

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Kyushu responsible Sakaigawa: "Now the rikishi definitely can't complain any-more."

Onosho: "Hold my Chanko"

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