{"id":43246,"date":"2020-12-14T08:00:31","date_gmt":"2020-12-13T23:00:31","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=43246"},"modified":"2026-05-17T14:22:28","modified_gmt":"2026-05-17T05:22:28","slug":"core-drill-casing-not-rock","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/core-drill-casing-not-rock\/","title":{"rendered":"Casing Tubes for Core Drilling Are Not Suitable for Rock Formations | Limitations"},"content":{"rendered":"

Hello, everyone.<\/p>\n

This is Enta.<\/p>\n

It's finally starting to get cold, isn't it!<\/p>\n

The job site is super tough, lol.<\/p>\n

\"Core<\/p>\n

We're doing this kind of work inside the tunnel, but\u2014perhaps because of the bedrock\u2014the casing tube is getting completely worn out from the bit.<\/p>\n

\"Casing<\/p>\n

This is brand new.<\/p>\n

\"Casing<\/p>\n

I've also included the bits.<\/p>\n

This casing tube is nice because it's light, but it's thin.<\/p>\n

\"Core<\/p>\n

As soon as you drill into bedrock, it ends up looking like this and becomes unusable.<\/p>\n

Well, it\u2019s not really meant to be used this way, so it\u2019s only natural that it would break, but if I keep going like this, I\u2019m worried it might snap inside while I\u2019m drilling...<\/p>\n

I really came to understand just how soft concrete is.<\/p>\n

 <\/p>\n

So, we decided to produce it in-house.<\/p>\n

Casing tube, w<\/p>\n

I was well aware that it wasn't meant for bedrock, but I didn't expect it to be this flimsy...<\/p>\n

Well, for now, I'll try making it thicker. I'm also thinking of using a slightly harder material and heat-treating it to increase its hardness.<\/p>\n

I'd like to make it strong enough to withstand a few taps with a hammer.<\/p>\n

I imagine other companies are probably having trouble with this as well\u2014what do you think?<\/p>\n

Since concrete is soft, I think this tube will work fine, but with bedrock or sandstone, the outer layer will wear away quickly.<\/p>\n

 <\/p>\n

For now, the stock bits are fine, so I'm hoping to keep things as they are.<\/p>\n

Surprisingly, once you give it a try, the core-drilling industry turns out to be quite complex and fun.<\/p>\n

In the Kanto region, we use this equipment to install rock bolts, but I\u2019ve noticed that M\u2019s seems to have recently developed a machine equipped with a hammer that can drill using a double-tube system, and I\u2019m curious about it.<\/p>\n

Since President Sawada of M's went out of his way to call me and mentioned that they have a demo unit available, I'm thinking of looking into it. (Thanks for checking out my blog, lol.)<\/p>\n

\"Ring<\/p>\n

That said, I can\u2019t start drilling until I figure out what to do with the casing tube, lol. If I use the demo unit\u2019s hammer function, there\u2019s a pretty good chance the casing tube will get crushed.<\/p>\n

You'll probably need to use a standard bit with a chip.<\/p>\n

Well, I don't know what will happen going forward, but for now, I'll keep things as they are and try out various ideas for a while. (I'll make the casing tube.)<\/p>\n

 <\/p>\n

However, I have a feeling that this drilling will turn up something.<\/p>\n

Since it\u2019s mostly hand-dug, it\u2019s very easy to get a feel for the drilling process.<\/p>\n

The vibrations and pressure you feel in your hands are just irresistible, aren't they?<\/p>\n

I'm hoping that this drilling will bring something new to light.<\/p>\n

 <\/p>\n

See you later.<\/p>\n

\"\"<\/div>
www.ems-esd.co.jp<\/div><\/div>
\"\"<\/figure>
M's Co., Ltd. | Spring Drill: Manufacturing, Development, and Maintenance of Construction Machinery<\/div>
http:\/\/www.ems-esd.co.jp<\/div>
The corporate website of M's Co., Ltd. We manufacture, develop, and provide maintenance services for construction machinery products, including our spring drills equipped with our proprietary, patented \"Drifter\" system.<\/div><\/div>
<\/div><\/div><\/a><\/div><\/div>\n

M's Co., Ltd.<\/a><\/p>","protected":false},"excerpt":{"rendered":"

Hello, everyone. This is Enta. It\u2019s finally starting to get cold, isn\u2019t it! It\u2019s super tough out here on the job site, lol. We\u2019re doing this kind of work inside a tunnel, but\u2014maybe because of the bedrock\u2014the casing tubes get completely worn out from the drill bit. This one\u2019s brand new. We\u2019ve also attached the drill bit\u2026<\/p>","protected":false},"author":2,"featured_media":43229,"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":[90,1],"tags":[205,804,1487,4135,4141],"class_list":["post-43246","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-drain-boring","category-others","tag-205","tag-804","tag-1487","tag-4135","tag-4141"],"acf":[],"yoast_head":"\n\u30b3\u30a2\u30c9\u30ea\u30eb\u7528\u30b1\u30fc\u30b7\u30f3\u30b0\u30c1\u30e5\u30fc\u30d6\u306f\u5ca9\u76e4\u5411\u304d\u3067\u306f\u7121\u3044\uff5c\u9650\u754c - 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