{"id":39867,"date":"2019-08-27T08:00:33","date_gmt":"2019-08-26T23:00:33","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=39867"},"modified":"2026-05-17T13:28:54","modified_gmt":"2026-05-17T04:28:54","slug":"self-drilling-bolt-selection-check","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/self-drilling-bolt-selection-check\/","title":{"rendered":"Points to Check Before Selecting Self-Drilling Rock Bolts | Site Conditions"},"content":{"rendered":"<p>Hello, everyone.<\/p>\n<p>This is Enta.<\/p>\n<p>\u5148\u65e5\u306e\u4e5d\u5dde\u3067\u306f\u3060\u3044\u3076\u6dbc\u3057\u304f\u306a\u3063\u3066\u304a\u308a\u3001\u3042\u308c\uff1f\u79cb\uff1f\uff1f<\/p>\n<p>\u3063\u3066\u601d\u3046\u307b\u3069\u3067\u3057\u305f\u3002<\/p>\n<p>\u6628\u5e74\u306e\u707c\u71b1\u5730\u7344\u3092\u601d\u3048\u3070\u6628\u5e74\u306f\u30db\u30f3\u30c8\u7570\u5e38\u6c17\u8c61\u3067\u3057\u305f\u306d\uff01<\/p>\n<p>\u697d\u5e74\u306b\u6bd4\u3079\u3066\u4f53\u304c\u697d\u306a\u306e\u3067\u826f\u3044\u3067\u3059\u3002<\/p>\n<hr \/>\n<p>But that's beside the point.<\/p>\n<h3><span style=\"font-size: 120%;\">Points to Consider When Choosing Self-Drilling Screws<\/span><\/h3>\n<p>There are quite a few reasons to choose self-drilling rock bolts, aren't there?<\/p>\n<p>The key selling point of this self-drilling rock bolt is that it can be drilled even if the borehole wall is not self-supporting.<\/p>\n<p>However, this actually caused a problem in the past.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-6163\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/03\/a8e0194fae1d50be5b855c7692029839-600x450.jpg\" alt=\"Self-Drilling: Verification of Finished Shape\" width=\"600\" height=\"450\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/03\/a8e0194fae1d50be5b855c7692029839.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/03\/a8e0194fae1d50be5b855c7692029839-300x225.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>Self-drilling rock bolts look something like this, right?<\/p>\n<p>(Please ignore the image preview.)<\/p>\n<p>Self-drilling rock bolts can generally be drilled into most surfaces.<\/p>\n<p>Even if the borehole wall keeps collapsing, it\u2019s easy to drill down to the specified depth into the bedrock.<\/p>\n<p>On the other hand, if the excavated soil is not being discharged, the cement slurry injection will stop at the tip.<\/p>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"color: #ff0000;\">The key to drilling with self-drilling rock bolts is to drill while ensuring the borehole walls remain stable.<\/span><\/strong>What's up with that! lol<\/p>\n<p>I'm saying something weird, aren't I?<\/p>\n<p>Realistically speaking, to remove the drill cuttings, you have to clean thoroughly as you go.<\/p>\n<p>To do this, we repeatedly move the steel beams in and out to remove the soil.<\/p>\n<p>\u305d\u3057\u3066\u30ed\u30c3\u30af\u30dc\u30eb\u30c8\u3092\u4e88\u5b9a\u306e\u7b87\u6240\u306b\u30bb\u30c3\u30c8\u51fa\u6765\u308b\u3093\u3067\u3059\u3002<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: 130%;\"><strong><span style=\"color: #ff0000;\">There is no other way to ensure that the grout is injected into the self-drilling rock bolts!!!<\/span><\/strong><\/span><\/p>\n<p>That said, there is one method: drilling a double-pipe borehole and installing self-drilling rock bolts...<\/p>\n<p>&nbsp;<\/p>\n<p>Any rock bolt into which cement slurry cannot be reliably injected is considered a defective installation.<\/p>\n<p>It was a human error during construction.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-6358\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/03\/IMG_1867-600x450.jpg\" alt=\"Self-drilling Rock Bolts: Grout Injection\" width=\"600\" height=\"450\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/03\/IMG_1867.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/03\/IMG_1867-300x225.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p><span style=\"font-size: 130%;\"><strong><span style=\"color: #0000ff;\">The most important factor to consider when selecting and installing self-drilling rock bolts is<\/span><\/strong><\/span><\/p>\n<p><span style=\"font-size: 150%;\"><strong><span style=\"color: #ff0000;\">1. Is it possible to reliably inject the cement slurry?<\/span><\/strong><\/span><\/p>\n<p><span style=\"font-size: 150%;\"><strong><span style=\"color: #ff0000;\">2. Is it possible to apply the cement slurry so that it completely coats the steel?<\/span><\/strong><\/span><\/p>\n<p><span style=\"font-size: 150%;\"><strong><span style=\"color: #ff0000;\">3. Does the design have a diameter that allows for circumferential friction?<\/span><\/strong><\/span><\/p>\n<p>*Note: Even if the cement slurry is partially displaced by soil, there is a very real possibility that the circumferential friction will not be lost.<\/p>\n<p>&nbsp;<\/p>\n<p>Please take that into consideration when reviewing the matter.<\/p>\n<p>\u6a5f\u68b0\u304c\u5165\u3089\u306a\u3044\u304b\u3089\u81ea\u7a7f\u5b54\u3067\u3063\u3066\u8a00\u3046\u9078\u629e\u80a2\u306f\u5341\u5206\u3042\u308a\u307e\u3059\uff01<\/p>\n<p>&nbsp;<\/p>\n<p>See you later.<\/p>","protected":false},"excerpt":{"rendered":"<p>Hello, everyone. This is Enta. It\u2019s gotten quite cool here in Kyushu lately\u2014so much so that I found myself thinking, \u201cHuh? Is it fall already??\u201d Compared to last year\u2019s scorching heat, the weather last year really was extreme! It\u2019s nice that my body feels better this year compared to last. But enough of that. Here are some things to check before deciding on self-piercing: Self\u2026<\/p>","protected":false},"author":2,"featured_media":39209,"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":[30],"tags":[49,116,416,570,1523,2692],"class_list":["post-39867","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lock-bolt","tag-49","tag-116","tag-416","tag-570","tag-1523","tag-2692"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.2 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ 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