{"id":57217,"date":"2025-11-20T08:00:43","date_gmt":"2025-11-19T23:00:43","guid":{"rendered":"https:\/\/norimen.net\/?p=57217"},"modified":"2026-05-16T17:54:36","modified_gmt":"2026-05-16T08:54:36","slug":"oya-stone-measurements","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/oya-stone-measures\/","title":{"rendered":"A Slope Construction Specialist Considers Solutions for \u014cya Stone!"},"content":{"rendered":"<p>Hello, everyone.<\/p>\n<p>This is Enta.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-57218\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/11\/2025-11-15-11.47.33.jpg\" alt=\"Otani Stone\" width=\"600\" height=\"450\" \/><\/p>\n<p>Recently, in private construction projects, I\u2019ve been asked to take measures regarding Otani stone.<\/p>\n<p>While I do specialize in measures to counter soil pressure and heavy rain, you mean the surface?!<\/p>\n<p>&nbsp;<\/p>\n<p>Slope stabilization isn't really a big deal, but when it comes to preventing rock weathering, what are we slope specialists supposed to do?!<\/p>\n<p>What exactly is Otani Stone?<\/p>\n<p>I think a lot of slope contractors feel this way, so I'll just copy and paste the AI's opinion.<\/p>\n<hr \/>\n<h3>The History of Otani Stone<\/h3>\n<p>\u25cf Tuff quarried in \u014cya-ch\u014d, Utsunomiya City, Tochigi Prefecture.<br \/>\nIt consists of volcanic deposits from about 15 million years ago that have accumulated and solidified.<\/p>\n<p>\u25cf It has been in use since the Heian period.<br \/>\nIt is used in temples, stone pagodas, and stone walls, and has become widespread throughout Japan due to its ease of processing.<\/p>\n<p>\u25cf It reached its peak during the Meiji and early Sh\u014dwa periods.<br \/>\n\u30fbStorehouse<br \/>\n\u30fbFence<br \/>\n\u30fbExterior walls of a house<br \/>\n\u30fbSchools and Public Buildings<br \/>\nIt was used extensively in various applications, and the town became known nationwide as **\u201cOtani-machi = the town of stone\u201d**.<\/p>\n<p>\u25cf After the war, their numbers declined due to cost and durability concerns.<br \/>\nHowever, in recent years, its unique character and warm texture have been highly regarded,<br \/>\nIt is once again gaining attention in areas such as store design, residential architecture, and gardening.<\/p>\n<p><span style=\"font-size: 20px;\"><strong><a href=\"http:\/\/www.oya909.co.jp\/\" target=\"_blank\" rel=\"noopener\">Otani Stone Museum<\/a><\/strong><\/span><\/p>\n<p>Advantages of Otani Stone<br \/>\n\u2460 Easy to work with (soft stone)<\/p>\n<p>\u30fbEasy to cut out with a chisel or utility knife<br \/>\n\u30fbCurved surfaces and high-design finishes are also possible<br \/>\n\u2192 Offers a high degree of flexibility in construction and is well-suited for shortening construction schedules<\/p>\n<p>\u2461 High moisture absorption and thermal insulation properties<\/p>\n<p>\u30fbIt contains countless air bubbles (a pumice-like structure) and<br \/>\n\u2192 Cool in summer, warm in winter<br \/>\n\u2192 One of the reasons it was used as a \u201cstorehouse\u201d<\/p>\n<p>\u2462 High fire resistance<\/p>\n<p>\u30fbSince it is a volcanic rock, it does not burn<br \/>\n\u2192 Highly safe as a building material<\/p>\n<p>\u2463 Unique texture (attractive appearance)<\/p>\n<p>\u30fbPale green to grayish brown<br \/>\n\u30fbSoft texture<br \/>\n\u30fbThe patina that comes with age adds character<br \/>\n\u2192 Popular in retail stores and upscale residences<\/p>\n<p>\u2464 Relatively lightweight stone<\/p>\n<p>\u30fbLighter than similar types of stone (such as granite)<br \/>\n\u2192 Easy to transport and places minimal structural load<\/p>\n<p>Disadvantages of Otani Stone<br \/>\n\u2460 It absorbs water easily, and<strong><span style=\"color: #ff0000;\">Prone to deterioration<\/span><\/strong><\/p>\n<p>Because it's soft and has lots of air bubbles,<br \/>\n\u30fbAbsorbs water<br \/>\n\u30fbSuffer frost damage<br \/>\n\u30fbProne to weathering<br \/>\n\u2192 Waterproofing and regular maintenance are essential for outdoor use<\/p>\n<p>\u2461 Low strength<\/p>\n<p>\u30fbIt has lower compressive strength than granite and andesite, for example<br \/>\n\u30fbNot suitable for structural use<br \/>\n\u2192 Used primarily as **decorative finishes**<\/p>\n<p>\u2462 Prone to chipping during installation<\/p>\n<p>Because it is a soft stone<br \/>\n\u30fbChipped corners<br \/>\n\u30fbProne to breaking<br \/>\n\u2192 Careful construction is required<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-57220\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/11\/2025-11-15-11.40.31.jpg\" alt=\"Otani Stone\" width=\"600\" height=\"450\" \/><\/p>\n<p>This is what Otani stone looks like.<\/p>\n<p>If you're a slope contractor, why not just spray on some mortar!?<\/p>\n<p>That's what you're thinking, right?<\/p>\n<p>&nbsp;<\/p>\n<p>But when it comes to residential construction on private land, it can be quite a challenge to set up protective measures and find space for machinery, can't it?<\/p>\n<p>If we consider the minimum necessary measures and the minimum necessary construction work,<strong>It's not mortar.<\/strong>That's what I think.<\/p>\n<p>&nbsp;<\/p>\n<p>So that would be chemical products, such as resin-based ones, right?<\/p>\n<p>Apply it to prevent deterioration.<\/p>\n<p>While looking into various options, I'm trying to find a product with a proven track record in the public sector, lol.<\/p>\n<p>&nbsp;<\/p>\n<p>When you think about it, products with a proven track record in the public sector are the ones that get chosen first in situations like this!<\/p>\n<p>&nbsp;<\/p>\n<hr \/>\n<p>When it comes to measures for Oya Stone in the world, it\u2019s the lies that really stand out.<\/p>\n<p>The reason is that, even though the goal is to cause the natural mountain to collapse, they\u2019re only focused on preventing the surface rocks from weathering!<\/p>\n<p>This is the root of the problem.<\/p>\n<p>The main purpose was supposed to be to protect against soil pressure and heavy rain, but...<\/p>\n<p>It's like saying you only need to make the surface of the stone wall look nice.<\/p>\n<p>As a civil engineer, I find this situation unacceptable, so I want to make sure we establish clear guidelines in this area.<\/p>\n<p>&nbsp;<\/p>\n<p>I've been doing some slope stabilization work lately, but I've also been given the opportunity to work on construction projects, so it's really interesting!<\/p>\n<p>And since it\u2019s a completely different industry, I\u2019ll need to learn everything from scratch, but it\u2019s exciting.<\/p>\n<p>It's kind of like how it's fun to try out other trades every now and then. (Although some people don't like change.)<\/p>\n<p>&nbsp;<\/p>\n<p>And even though it's tiring because I have to really put my brain to work, these days the fun outweighs the fatigue lol<\/p>\n<p>Let's try new things little by little, without taking any risks!<\/p>\n<p>&nbsp;<\/p>\n<p>See you later.<\/p>","protected":false},"excerpt":{"rendered":"<p>Hello, everyone. This is Enta. Lately, on private construction projects, we\u2019ve been asked to address issues with Oya stone. While we specialize in solutions for soil pressure and heavy rain, the surface?!   Slope stabilization isn\u2019t that big of a deal, but when it comes to preventing the stone from weathering, what are we slope engineers supposed to do\u2026<\/p>","protected":false},"author":2,"featured_media":57222,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1],"tags":[1479,3181,14047,14048,14049],"class_list":["post-57217","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-others","tag-1479","tag-3181","tag-14047","tag-14048","tag-14049"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.4 (Yoast SEO v28.4) - 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