{"id":48726,"date":"2023-03-27T08:00:37","date_gmt":"2023-03-26T23:00:37","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=48726"},"modified":"2026-05-17T14:51:42","modified_gmt":"2026-05-17T05:51:42","slug":"lockbolt-construction","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/lockbolt-construction\/","title":{"rendered":"For mountains where double-pipe drilling isn't possible and the borehole walls won't hold on their own, self-drilling is the only option\u2014but this is the only way to eliminate all uncertainty!"},"content":{"rendered":"<p>Hello, everyone.<\/p>\n<p>This is Enta.<\/p>\n<p>I received a question on Twitter regarding my recent post.<\/p>\n<p>Since I think this is something that design consultants and government officials might not understand, I\u2019d like to explain it.<\/p>\n<blockquote class=\"twitter-tweet\">\n<p dir=\"ltr\" lang=\"ja\">If double-tube drilling cannot be used and self-drilling rock bolts must be used instead, how should the design be approached?<br \/>\n(1) It is generally intended for use in areas where the borehole wall is not stable.<br \/>\n(2) Uncertainty arising from the loss of circumferential friction between the grout and the surrounding rock when the borehole wall collapses<\/p>\n<p>\u2014 Kurokuro (@vEVaav0lwtpgbpx) <a href=\"https:\/\/twitter.com\/vEVaav0lwtpgbpx\/status\/1639414931828412416?ref_src=twsrc%5Etfw\">March 24, 2023<\/a><\/p><\/blockquote>\n<p><script async src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script><\/p>\n<p>When you can't drill a double-pipe hole, and the hole wall won't hold on its own even with self-drilling bolts!<\/p>\n<p>&nbsp;<\/p>\n<p>In this case, drilling is generally done by hand, but<\/p>\n<p>Even in a place like this<span style=\"font-size: 150%;\"><strong><span style=\"color: #ff0000;\">We have no choice but to use self-tapping bolts!<\/span><\/strong><\/span><\/p>\n<p>I think it's safe to say that there are basically no other methods (for now).<\/p>\n<p>&nbsp;<\/p>\n<p>Since we\u2019ll be using self-drilling rock bolts for this project, there\u2019s something I absolutely want you to do.<\/p>\n<p>Self-drilling rock bolts must always<span style=\"font-size: 130%;\"><strong><span style=\"color: #ff0000;\">Plated finish; uses a swivel<\/span><\/strong><\/span>I'd like you to drill a hole there.<\/p>\n<p>The reason is that we want to avoid clogging the tip of the self-tapping bolt to ensure a reliable injection!<\/p>\n<p>Doing so increases the likelihood of a successful injection.<\/p>\n<p>I'm sure you understand the benefits of using plated bolts. (They solve the problem of material corrosion.)<\/p>\n<p>&nbsp;<\/p>\n<p>It's hard to understand why a swivel is used in this type of hand-dug hole, isn't it?<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2204\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2016\/12\/4a2c8c2437f7144e9fa890374417cb28.jpg\" alt=\"Leg Drill\" width=\"600\" height=\"460\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2016\/12\/4a2c8c2437f7144e9fa890374417cb28.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2016\/12\/4a2c8c2437f7144e9fa890374417cb28-300x230.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>I think you'd generally use a leg drill like this when drilling holes for self-drilling rock bolts.<\/p>\n<p>When you lower the lever on this leg drill, it performs a rotating and striking motion.<\/p>\n<p>The lever is in the middle, in the neutral position.<\/p>\n<p>Pull the lever up to supply air.<\/p>\n<p><span style=\"font-size: 150%;\"><strong><span style=\"color: #ff0000;\">You can't send air to the tip while performing a spinning strike.<\/span><\/strong><\/span><\/p>\n<p>That means the hole at the tip tends to get clogged.<\/p>\n<p>&nbsp;<\/p>\n<p>Suspended core drills bore holes using rotation, percussion, and air at the drill bit tip, right?<\/p>\n<p>That's why drilling is pretty fast, and it produces a good amount of drilling slime (the slime that comes out during drilling).<\/p>\n<div class=\"jetpack-video-wrapper\"><iframe loading=\"lazy\" title=\"Suspended Drilling\u2014No Measures to Prevent Stone Ejection\" width=\"640\" height=\"480\" src=\"https:\/\/www.youtube.com\/embed\/70Uz0MNJVkc?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p><span style=\"font-size: 150%;\"><strong><span style=\"color: #ff0000;\">Chestnut Flour<\/span><\/strong><\/span>That refers to the white powder in the YouTube video.<\/p>\n<p>The shape and appearance of drill cuttings vary depending on the bedrock, soil, and clay being drilled.<\/p>\n<div class=\"jetpack-video-wrapper\"><iframe loading=\"lazy\" title=\"Suspended Drilling Rig: Slime Condition\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/woxBOE6GS1Q?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p>This state, in which the chestnut flour is easily released, is one in which the interior of the pore walls remains intact and self-supporting due to a continuous stream of air from the tip.<\/p>\n<p>The drilling slurry is forced out from the tip toward the outlet (hole opening).<\/p>\n<p>Since air is being expelled at the same time as the rotary impact, you can see that this reduces clogging at the tip and allows for more efficient drilling, right?<\/p>\n<p>&nbsp;<\/p>\n<p>Drilling with a hand-operated leg drill is<\/p>\n<p>Lower Lever: Rotation and Striking<br \/>\n\u2193<br \/>\nPull the lever: Release the air to dispense the flour.<br \/>\n\u2193<br \/>\nLower Lever: Rotation and Striking<br \/>\n\u2193<br \/>\nPull the lever: Release the air to dispense the flour.<\/p>\n<p>We'll keep moving forward, little by little.<\/p>\n<p>&nbsp;<\/p>\n<p>For people who are inexperienced at drilling, the hole at the tip is almost always clogged, and<span style=\"font-size: 130%;\"><strong><span style=\"color: #ff0000;\">Cannot inject!<\/span><\/strong><\/span><\/p>\n<p>In short, it's a construction defect.<\/p>\n<p>That is precisely why it is necessary to perform the drilling properly to ensure the injection is successful.<\/p>\n<p>You can see that it\u2019s absolutely essential for the grout to be injected through those air holes, so they must not be clogged.<\/p>\n<p>&nbsp;<\/p>\n<p>Now, suppose the borehole wall collapses after drilling.<\/p>\n<p>If the tip isn't clogged, the grout will flow out of the tip and rise up around the bolt head.<\/p>\n<p>At that time,<\/p>\n<p><span style=\"font-size: 150%;\"><strong><span style=\"color: #ff0000;\">Wiggle the bolt up, down, left, and right to let it blend with the grout! (This is really important.)<\/span><\/strong><\/span><\/p>\n<p>This alone should be enough to create a self-drilling rock bolt that provides a secure hold.<\/p>\n<p>It's okay to jig while jigging<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6361\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/03\/IMG_1864.jpg\" alt=\"Status of Grout Injection for Self-Drilling Rock Bolts\" width=\"600\" height=\"450\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/03\/IMG_1864.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/03\/IMG_1864-300x225.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>(The photo above shows packing being inserted to prevent backflow through the hole.)<\/p>\n<p>There are tons of job sites where the only way to install the system is by self-drilling.<\/p>\n<p>This machine can be used even on job sites where the leg drill has a reach of about 1.0 m and, considering the width of a person, there is only about 1.5 m of space available.<\/p>\n<p>(If it's 1.0 m or less, there are other options.)<\/p>\n<p>&nbsp;<\/p>\n<p>Even without using a support, you can be sure the installation will be successful if you follow the method described above, but,<\/p>\n<p>I\u2019d really like to have an experienced crew handle this if possible, lol.<\/p>\n<p>Or, if there's someone who can provide solid guidance, I think things will work out.<\/p>\n<p>Since it\u2019s necessary to come up with ways to ensure reliable construction even in difficult-to-reach areas,<\/p>\n<p>Let's proceed with the construction based on our knowledge and experience.<\/p>\n<p>Furthermore, on the design consulting side, the self-drilling rock bolts are plated, and<\/p>\n<p>I think you should just specify that a swivel is to be used. (That way, the contractors can ensure the work is done properly.)<\/p>\n<p>&nbsp;<\/p>\n<p>See you later.<\/p>\n<p>&nbsp;<\/p>\n<p><a title=\"Manual Drilling and Grout Injection for Self-Drilling Rock Bolts\" href=\"https:\/\/norimen.net\/en\/wordpress\/%e8%87%aa%e7%a9%bf%e5%ad%94%e3%83%ad%e3%83%83%e3%82%af%e3%83%9c%e3%83%ab%e3%83%88%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e4%ba%ba%e5%8a%9b%e5%89%8a%e5%ad%94%e3%81%a8%e6%b3%a8%e5%85%a5\/\" target=\"_blank\" rel=\"noopener\">Manual Drilling and Grout Injection for Self-Drilling Rock Bolts<\/a><\/p>\n<p><a title=\"Inspection of the Finished Product for Self-Drilling Rock Bolts\" href=\"https:\/\/norimen.net\/en\/wordpress\/%e8%87%aa%e7%a9%bf%e5%ad%94%e3%83%ad%e3%83%83%e3%82%af%e3%83%9c%e3%83%ab%e3%83%88%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e5%87%ba%e6%9d%a5%e5%bd%a2%e7%a2%ba%e8%aa%8d\/\" target=\"_blank\" rel=\"noopener\">Inspection of the Finished Product for Self-Drilling Rock Bolts<\/a><\/p>\n<p><a title=\"Key Points of Self-Drilling Rock Bolts\" href=\"https:\/\/norimen.net\/en\/wordpress\/lockbolt-point\/\" target=\"_blank\" rel=\"noopener\">Key Points of Self-Drilling Rock Bolts<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Hello, everyone. This is Enta. I received a question on Twitter regarding my recent article. Since I think this is an area that design consultants and government officials might not be familiar with, I\u2019d like to address it. When double-tube drilling isn\u2019t an option and you have to use self-drilling rock bolts, how should you approach the design\u2026<\/p>","protected":false},"author":2,"featured_media":6364,"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":[44,116,416,799,1308,5644,5645],"class_list":["post-48726","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lock-bolt","tag-44","tag-116","tag-416","tag-799","tag-1308","tag-5644","tag-5645"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.2 (Yoast SEO v28.2) - 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