{"id":47371,"date":"2022-08-11T08:00:22","date_gmt":"2022-08-10T23:00:22","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=47371"},"modified":"2026-05-16T13:32:24","modified_gmt":"2026-05-16T04:32:24","slug":"nominal-diameter-misunderstanding","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/nominal-diameter-misunderstanding\/","title":{"rendered":"Since the nominal diameter differs so much from the actual size, quite a few people are under the wrong impression."},"content":{"rendered":"

Hello, everyone.<\/p>\n

This is Enta.<\/p>\n

\u516c\u79f0\u5f84\u3063\u3066\u77e5\u3063\u3066\u3044\u308b\u3068\u601d\u3044\u307e\u3059\u304c\u3001\u5b9f\u306f\u8a2d\u8a08\u30b3\u30f3\u30b5\u30eb\u306e\u65b9\u304c\u601d\u3063\u3066\u3044\u308b\u30e2\u30ce\u3068\u306f\u5b9f\u306f\u5168\u7136\u9055\u3046\u3093\u3067\u3059\u3002<\/p>\n

Nominal Diameter<\/h3>\n

You often see hole diameters like 90, 115, or 135 listed in design specifications and drawings, don't you?<\/p>\n

So, when I calculate the ingredients for the cement slurry, sometimes I end up short.<\/p>\n

\u30ed\u30b9\u7387\u3082\u554f\u984c\u3082\u3042\u308a\u307e\u3059\u304c\u3001\u5b9f\u306f\u305d\u308c\u3060\u3051\u3067\u306f\u306a\u3044<\/span><\/strong>That's right.<\/p>\n

 <\/p>\n

The design specifies a hole diameter of 90 mm, but it\u2019s actually about 105 mm.<\/p>\n

The outer casing is 96 mm, and the bit diameter is 105 mm.<\/p>\n

The diameter varies by a few millimeters depending on the manufacturer.<\/p>\n

\u516c\u79f0\u5f84\u3068\u8a00\u3063\u3066\u03c690\u3063\u3066\u3044\u3046\u306e\u306f\u5b58\u5728\u3057\u306a\u3044\u3093\u3067\u3059\u3002<\/p>\n

\u03c690\u306f\u03c696\u3067\u3001\u30d3\u30c3\u30c8\u5f84\u306f105\u339c\u306a\u3093\u3067\u3059\u3002<\/p>\n

\u8a2d\u8a08\u306815\u339c\u3082\u9055\u3046\u3093\u3067\u3059\uff57<\/p>\n

 <\/p>\n

For the 115mm size, the outer casing is 118mm and the bit diameter is 127mm.<\/p>\n

\"Ring<\/p>\n

The tip of the blade is sticking out.<\/p>\n

\"Ring<\/p>\n

This means that even if the bit isn't brand new, the drilling diameter is still guaranteed.<\/p>\n

The design diameter is commonly referred to asNominal Diameter<\/b>That's what they call it, isn't it?<\/p>\n

Use this number when calculating the cement content in cement slurry for the most accurate results.<\/p>\n

 <\/p>\n

There's one more thing you need to be careful about.<\/p>\n

Although the drilling diameter for rock bolts is specified as 65 mm, this is not a problem under Site Condition 1.<\/p>\n

The issue lies with single-hole drilling under Site Condition 2.\"Inner<\/p>\n

The tip of this one is sticking out as well.<\/p>\n

\"Inner<\/p>\n

This bit is the inner bit for a skid-type core drill.<\/p>\n

The inner rod diameter is 57 mm.<\/p>\n

The bit diameter is 64 mm<\/b>What?!<\/p>\n

We're interpreting that as 65 mm based on the design nominal diameter.<\/p>\n

However, a brand-new bit is about 65 mm long.<\/p>\n

However, if you use a bit that\u2019s been used a little, the hole diameter gets really bad.<\/p>\n

People ask, \u201cSo what am I supposed to do?!\u201d but all I can say is, \u201cCheck that the bit is brand new and use it\u201d (lol).<\/p>\n

 <\/p>\n

Alternatively, use a bit designed for the 73mm inner casing.<\/p>\n

 <\/p>\n

A bit for inner casings designed for use with outer casings 90 mm or larger,<\/p>\n

The bit diameter for a 73mm inner rod is 80\u201383mm.<\/p>\n

\"73<\/p>\n

It ends up being about 25% larger than the design.<\/p>\n

\"Inner<\/p>\n

Naturally, when the diameter increases that much, the amount of cement also increases.<\/p>\n

Since we're at it, let's get creative and...<\/p>\n

Under the pretext of ensuring the quality of the drilled holes,<\/p>\n

\"Since there will be areas where the required drill hole diameter cannot be achieved if the drill bit becomes worn, drill a larger hole in advance.\"<\/p>\n

I guess that's one way to look at it. The amount of cement will increase, but the cost is negligible.<\/p>\n

It'll be a little bigger, but if you want to play it safe during installation...<\/p>\n

 <\/p>\n

\u516c\u79f0\u5f84\u306e\u304a\u9670\u3067\u610f\u5916\u3068\u5b89\u5168\u5074\u306b\u8a2d\u8a08\u3055\u308c\u3066\u3044\u308b\u3068\u601d\u3048\u3070\u306a\u3093\u3060\u304b\u4f59\u88d5\u3092\u611f\u3058\u307e\u3059\u3088\u306d\uff1f<\/p>\n

\u77e5\u3089\u3093\u3051\u3069…<\/p>\n

 <\/p>\n

See you later.<\/p>","protected":false},"excerpt":{"rendered":"

Hello, everyone. This is Enta. I\u2019m sure you\u2019re familiar with the term \u201cnominal diameter,\u201d but it\u2019s actually quite different from what design consultants tend to think it is. Nominal Diameter: You often see borehole diameters like 90, 115, or 135 listed in design documents and drawings, right? And for cement slurry\u2026<\/p>","protected":false},"author":2,"featured_media":7273,"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":[28,30],"tags":[48,116,169,595,1516],"class_list":["post-47371","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ground-anchor","category-lock-bolt","tag-48","tag-116","tag-169","tag-595","tag-1516"],"acf":[],"yoast_head":"\n\u516c\u79f0\u5f84\u306b\u3064\u3044\u3066\u5b9f\u969b\u3068\u9055\u3044\u3059\u304e\u308b\u305f\u3081\u306b\u3001\u52d8\u9055\u3044\u3057\u3066\u3044\u308b\u4eba\u304c\u591a\u3081 - 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