{"id":48512,"date":"2023-02-20T08:00:15","date_gmt":"2023-02-19T23:00:15","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=48512"},"modified":"2026-05-17T14:56:15","modified_gmt":"2026-05-17T05:56:15","slug":"nominal-diameter-drilling","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/nominal-diameter-drilling\/","title":{"rendered":"About Nominal Diameter | The Difference Between a 90 Drilled Diameter and Actual Dimensions, and Cement Calculations"},"content":{"rendered":"

Hello, everyone.<\/p>\n

This is Enta.<\/p>\n

The other day, Ishio-kun, a construction-themed YouTuber, came to our company!<\/p>\n

Ishio's Construction Channel<\/a><\/p>\n

We went together to check out a site where Enta is currently working on the first phase, and they interviewed me about all sorts of things lol<\/p>\n

Thank you to the general contractor for kindly granting permission to use their name.<\/p>\n

I really think public worksites should be open to the public.<\/p>\n

I feel like doing that would also have an impact on employment.<\/p>\n

Even at Enta, I'm thinking we might start doing on-site reporting as long as the main contractor is okay with it ^^<\/p>\n

\"Reinforcing<\/p>\n

\n

But that's beside the point.<\/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

While the loss rate is certainly an issue, that\u2019s actually not the only problem.<\/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

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.<\/p>\n

\"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\u2019re at it, let\u2019s get creative\u2014under the pretext of ensuring the quality of the drilled holes\u2014<\/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

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

Hello, everyone. This is Enta. The other day, Ishio-kun, a construction-themed YouTuber, came to visit our company! We went together to tour a construction site where Enta is the primary contractor for Ishio-kun\u2019s construction channel, and he interviewed us about all sorts of things lol. The general contractor also kindly gave us permission to mention their name\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":[90,28,30],"tags":[48,116,169,804,1516],"class_list":["post-48512","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-drain-boring","category-ground-anchor","category-lock-bolt","tag-48","tag-116","tag-169","tag-804","tag-1516"],"acf":[],"yoast_head":"\n\u516c\u79f0\u5f84\u306b\u3064\u3044\u3066\uff5c\u524a\u5b54\u5f8490\u3068\u5b9f\u5bf8\u306e\u9055\u3044\u3068\u30bb\u30e1\u30f3\u30c8\u8a08\u7b97 - 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