{"id":54258,"date":"2025-04-15T08:00:20","date_gmt":"2025-04-14T23:00:20","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=54258"},"modified":"2026-05-16T15:45:58","modified_gmt":"2026-05-16T06:45:58","slug":"reason-for-leak-in-pressure-grout-casing","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/pressure-grout-casing-leak-reason\/","title":{"rendered":"The Real Reason It Comes Out From the Outside of the Casing After Pressure Injection!"},"content":{"rendered":"<p>Hello, everyone.<\/p>\n<p>This is Enta.<\/p>\n<p>Are you performing pressurization work?<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-44132\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2021\/04\/2016-10-07-11.15.36.jpg\" alt=\"Packer Pressurization\" width=\"600\" height=\"338\" \/><\/p>\n<p>Well, I've always said that compression doesn't really do much, but why does that come out of my mouth?<\/p>\n<p>Since the conversation turned to that, I thought I'd give it a try.<\/p>\n<p>&nbsp;<\/p>\n<p>Drill the holes as usual, and insert ground anchors, rebar, and other materials.<\/p>\n<p>Then you'll inject it, right?<\/p>\n<p>In some cases, it\u2019s a dip-coating process, but for now, the material and grout are already in place.<\/p>\n<p>&nbsp;<\/p>\n<p>Then, pull the casing out all the way to the anchorage section.<\/p>\n<p>Next, we'll apply pressure.<\/p>\n<p>&nbsp;<\/p>\n<p>Before that, please take a look at the drilling casing and bit.<\/p>\n<p>This applies to a bore diameter of 90 mm.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-54259\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/04\/c78bed8567e53947474779ff676f3f41.png\" alt=\"Casing Bit Diameter (Drilling)\" width=\"600\" height=\"460\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/04\/c78bed8567e53947474779ff676f3f41.png 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/04\/c78bed8567e53947474779ff676f3f41-300x230.png 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>The casing is 96 mm.<\/p>\n<p>The bits are approximately 103 to 105 mm long.<\/p>\n<p>There is a clearance of approximately 7 mm to 10 mm. (About 3 mm to 5 mm on each side.)<\/p>\n<p>It\u2019s about 20 percent larger than the bore diameter.<\/p>\n<p>&nbsp;<\/p>\n<p>Circumferential friction also increases accordingly. (This makes it harder to slip out.)<\/p>\n<h3 class=\"\" data-start=\"65\" data-end=\"87\">\u2705 For \u03c690 (90 mm diameter):<span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\">\u03c0 \u00d7 90 \u2248 3.1416 \u00d7 90 = 282.74 mm<\/span><\/span><\/span><\/h3>\n<h3 class=\"\" data-start=\"167\" data-end=\"191\">\u2705 For \u03c6103 (103 mm diameter):<span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\">\u03c0 \u00d7 10\u00b3 \u2248 3.1416 \u00d7 10\u00b3 = 323.59 mm<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/h3>\n<p>The circumference of \u03c6103 is approximately \u201c1.44 times larger (14.44% larger)\u201d than that of \u03c690.<\/p>\n<p>Well, just take the circumferential friction as a rough guide, lol.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-54260\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/04\/080c709e9616fbbae23684ece4815df7.jpg\" alt=\"Drilling Clearance\" width=\"600\" height=\"460\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/04\/080c709e9616fbbae23684ece4815df7.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/04\/080c709e9616fbbae23684ece4815df7-300x230.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>In order to drill a hole and remove the casing, the hole must, of course, be larger than the casing.<\/p>\n<p>&nbsp;<\/p>\n<p>This is common knowledge, but I'll write it down for those who don't know.<\/p>\n<p>When inserting a 10-mm-diameter rebar into a hole, even if you drill a 10-mm hole, the rebar will not fit into it.<\/p>\n<p><span style=\"font-size: 150%;\"><strong><span style=\"color: #ff0000;\">A hole with a diameter of 10 mm or more is required.<\/span><\/strong><\/span><\/p>\n<p><span style=\"font-size: 150%;\"><strong><span style=\"color: #ff0000;\">This means that clearance is absolutely required.<\/span><\/strong><\/span><\/p>\n<p>&nbsp;<\/p>\n<p>Let's get back to the injection.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-54261\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/04\/d6fcee1b32267bdc744bb4bd13a8d683.jpg\" alt=\"Drilling and Pressurization\" width=\"600\" height=\"460\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/04\/d6fcee1b32267bdc744bb4bd13a8d683.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/04\/d6fcee1b32267bdc744bb4bd13a8d683-300x230.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>Pull the casing back to the anchoring section, then inject the material and pressurize it.<\/p>\n<p>&nbsp;<\/p>\n<p>At that moment, the clearance section of the surrounding rock at the dotted line portion of the casing (the free-length section) collapsed, and<\/p>\n<p>If the casing is in close contact with the surrounding rock, pressure will be applied.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-54263\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/04\/be2c0d825882e5945c46131b14043909.jpg\" alt=\"Drilling Clearance Failure\" width=\"600\" height=\"460\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/04\/be2c0d825882e5945c46131b14043909.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/04\/be2c0d825882e5945c46131b14043909-300x230.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>However, if the natural ground remains intact without collapsing, the pressure will escape through the weakest point.<\/p>\n<p>That means it comes out from the outside of the casing, right?<\/p>\n<p>Well, this is pretty obvious, but I hear there are some people in charge who just don't get it sometimes? lol<\/p>\n<p>&nbsp;<\/p>\n<p>So, please consider pressurization as an optional feature.<\/p>\n<p>It would be nice if it worked, but even if it did, it would relieve pressure (rather than maintain it), so it wouldn't really serve the purpose of pressurization.<\/p>\n<p>&nbsp;<\/p>\n<p>When pressure is applied, my imagination runs wild\u2014I picture it seeping into the natural ground\u2014but that\u2019s impossible.<\/p>\n<p>This is because the cement slurry has a coarse particle size, no matter how much pressure is applied to the ground.<\/p>\n<p>This is the approximate particle size.<\/p>\n<ul>\n<li class=\"\" data-start=\"128\" data-end=\"175\">\n<p class=\"\" data-start=\"131\" data-end=\"175\"><span style=\"font-size: 120%; color: #0000ff;\"><strong data-start=\"131\" data-end=\"150\">Cement slurry (cement particles)<\/strong><\/span><br data-start=\"150\" data-end=\"153\" \/><span style=\"font-size: 120%; color: #0000ff;\">\u3000\u2192 Approx. <strong data-start=\"158\" data-end=\"169\">1\u201350 \u03bcm<\/strong>(Particle)<\/span><\/p>\n<\/li>\n<li class=\"\" data-start=\"177\" data-end=\"215\">\n<p class=\"\" data-start=\"180\" data-end=\"215\"><span style=\"font-size: 120%; color: #0000ff;\"><strong data-start=\"180\" data-end=\"191\">Soil (clay particles)<\/strong><\/span><br data-start=\"191\" data-end=\"194\" \/><span style=\"font-size: 120%; color: #0000ff;\">\u3000\u2192 Approx. <strong data-start=\"199\" data-end=\"209\">1\u20135 \u03bcm<\/strong>(Particle)<\/span><\/p>\n<\/li>\n<li class=\"\" data-start=\"217\" data-end=\"271\">\n<p class=\"\" data-start=\"220\" data-end=\"271\"><span style=\"font-size: 120%; color: #0000ff;\"><strong data-start=\"220\" data-end=\"233\">Water molecules (H\u2082O)<\/strong><\/span><br data-start=\"233\" data-end=\"236\" \/><span style=\"font-size: 120%; color: #0000ff;\">\u3000\u2192 Approx. <strong data-start=\"241\" data-end=\"267\">0.000275 \u03bcm (= 0.275 nm)<\/strong>(Molecule)<\/span><\/p>\n<\/li>\n<\/ul>\n<p>You can see that cement slurry, which has larger molecules than soil, couldn't possibly be forced in under pressure, right?<\/p>\n<p>If this were bedrock with joints or cracks, the fluid would seep in; conversely, that would mean it wouldn\u2019t come back up even if injected.<\/p>\n<p>&nbsp;<\/p>\n<p>Applying pressure may indeed serve to expel the air inside and ensure that it is filled properly, but<\/p>\n<p>To begin with, adding cement slurry puts weight on the base plate, so...<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-8848\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/12\/b352ebc547d412726c780c61d9bdd509.jpg\" alt=\"Pressure caused by the grout&#039;s own weight\" width=\"600\" height=\"450\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/12\/b352ebc547d412726c780c61d9bdd509.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/12\/b352ebc547d412726c780c61d9bdd509-300x225.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>The deeper you go, the higher the pressure gets, doesn't it?<\/p>\n<p>&nbsp;<\/p>\n<p>See you later.<\/p>","protected":false},"excerpt":{"rendered":"<p>Hello, everyone. This is Enta. Are you doing pressure grouting? Well, I\u2019ve always said that pressure grouting isn\u2019t all that effective, but since the topic of \u201cWhy does it come out of the mouth?\u201d came up, I thought I\u2019d write about it.   Drill the holes as usual, and for ground anchors or\u2026<\/p>","protected":false},"author":2,"featured_media":49502,"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":[48,49,116,205,377,395,1279,1778,3347],"class_list":["post-54258","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ground-anchor","category-lock-bolt","tag-48","tag-49","tag-116","tag-205","tag-377","tag-395","tag-1279","tag-1778","tag-3347"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.2 (Yoast SEO v28.2) - 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