{"id":41335,"date":"2020-03-10T08:00:06","date_gmt":"2020-03-09T23:00:06","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=41335"},"modified":"2026-05-17T13:21:14","modified_gmt":"2026-05-17T04:21:14","slug":"spring-drill-limit-part-2","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/spring-drill-limit-part2\/","title":{"rendered":"Drilling Limits with Spring Drills (Part 2) | Continued Analysis"},"content":{"rendered":"

Hello, everyone.<\/p>\n

This is Enta.<\/p>\n

Regarding that spring drill hole I posted about the other day\u2014it actually worked out in the end lol.<\/p>\n

\"\"<\/div>
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Shin-Ent's Slope Management Seminar<\/div>
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For those of you who are serious about learning about slopes!<\/div><\/div>
<\/div><\/div><\/div><\/div><\/div>\n

This is a 17-meter borehole drilled into sandy soil.<\/p>\n

Drill hole diameter: \u03c6115<\/p>\n

It actually went surprisingly smoothly. (There's a trick to it, lol.)<\/p>\n

Well, since the drilling angle was 90 degrees vertical this time, it might have been easier than I expected.<\/p>\n

 <\/p>\n

The biggest challenge this time was a 2-meter-thick layer of silt at a depth of about 8 meters\u2014it turned out to be surprisingly hard.<\/p>\n

Once you get past this, you\u2019ll enter sandy soil again, but this time the backflow is incredibly strong, and sand rushes into the inner rod all at once.<\/p>\n

\"Sand<\/p>\n

The soil was so soft that I couldn't even tell where the N-value for the anchorage zone was, lol.<\/p>\n

If you turn off the water even for a minute, it gets clogged instantly. Plus, it gets stuck between the outer and inner layers, so it won't come out. (At first)<\/p>\n

We also had a very hard time because no drilling fluid was coming up.<\/p>\n

Especially for the first two, I kept taking all the inner layers out and putting them back in over and over again.<\/p>\n

I guess I was able to do that because it was only about 17 meters. If it had been over 30 meters, I would have been really fed up.<\/p>\n

 <\/p>\n

This time, we encountered a situation where the internal pressure was higher than expected and sand backflow was severe, so if we removed the inner rod, it would sink about 2 meters into the sand.<\/p>\n

As a result, the anchor body cannot be inserted after the cement slurry has been injected.<\/p>\n

Even the measuring rod could only reach 15 meters out of the 17 meters.<\/p>\n

Therefore, we had no choice but to inject the fluid through the inner rod. (The drilling fluid was kept flowing continuously.)<\/p>\n

Inject the cement slurry without removing the inner rod.<\/p>\n

That way, the weight of the cement slurry will help suppress the internal pressure.<\/p>\n

\"Grout<\/p>\n

However, while pumping water, I also pumped air vigorously to flush out as much sand from the holes as possible.<\/p>\n

After that, we quickly swapped out the hose and replaced the cement slurry by injecting it through the tip of the inner rod!<\/p>\n

We retrieved the inner rod as soon as we confirmed that the cement slurry had overflowed.<\/p>\n

It\u2019s a bit of an unconventional method, but it\u2019s a valid approach in its own right. (You could use a Kronenbit, but it\u2019s a matter of cost.)<\/p>\n

 <\/p>\n

Since we were able to confirm the strength of that cement slurry, the tension should be fine as long as we can eliminate the friction in the anchoring soil.<\/p>\n

There\u2019s a bit of a trick to how you inject it, but I\u2019ll save that for next time.<\/p>\n

 <\/p>\n

All in all, it was really great that we were able to drill to this depth using a spring drill this time.<\/p>\n

Now that we know the limits of the core drill, we should be able to use it for the next project as well.<\/p>\n

 <\/p>\n

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

Hello, everyone. This is Enta. Regarding the spring drill boring I posted about the other day\u2014it actually went well in the end, lol. It was a 17-meter borehole in sandy soil. The borehole diameter was \u03c6115. It went surprisingly smoothly. (There\u2019s a trick to it, lol.) Well, since the drilling angle was a vertical 90 degrees this time, I thought\u2026<\/p>","protected":false},"author":2,"featured_media":1505,"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":[1],"tags":[48,49,169,1589,1654,1788,2279],"class_list":["post-41335","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-others","tag-48","tag-49","tag-169","tag-1589","tag-n","tag-1788","tag-2279"],"acf":[],"yoast_head":"\n\u30b9\u30d7\u30ea\u30f3\u30b0\u30c9\u30ea\u30eb\u3067\u306e\u524a\u5b54\u9650\u754c\uff08\u305d\u306e2\uff09\uff5c\u691c\u8a3c\u7d9a\u304d - 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