{"id":49266,"date":"2023-06-19T08:00:15","date_gmt":"2023-06-18T23:00:15","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=49266"},"modified":"2026-06-10T02:14:44","modified_gmt":"2026-06-09T17:14:44","slug":"disaster-concrete-drilling-speed","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/disaster-concrete-drilling-speed\/","title":{"rendered":"How quickly can holes be drilled into concrete during a disaster?"},"content":{"rendered":"

Hello, everyone.<\/p>\n

This is Enta.<\/p>\n

As construction professionals, what do you think of this article?<\/p>\n\n\n\n
TBS NEWS DIG
\n\"The real thing is a whole different level of hardness...\" Firefighters Demolish 'Concrete Walls and Floors' at the Closed Maru Building for Training<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Looking at this work, don't you think it's taking too long to chisel?<\/p>\n

For the record, I have not taken into account the meaning, significance, or underlying concepts of this training.<\/p>\n

I just had some questions about the chiseling technique.<\/p>\n

That said, as civil engineers, we are, in a sense, professionals in the eyes of the general public.<\/p>\n

The difference between us and the rescue workers is clear. (After all, this is our job.)<\/p>\n

Just drill a hole\u2014leave the rescue work to the professionals!<\/p>\n

That\u2019s exactly why I\u2019m writing this\u2014in the hope that we can share information here.<\/p>\n

\"Communication\"<\/p>\n

\n

If you had to chisel through or drill a hole in a 25-centimeter-thick concrete slab, how would you go about it?<\/p>\n

 <\/p>\n

This is strictly for disaster response, but what materials and equipment are used to drill holes?<\/p>\n

I'd like to think about that.<\/p>\n

\"Rotary<\/p>\n

Under normal circumstances, we\u2019d use rotary percussion to clear it in an instant (if it\u2019s about 25 centimeters).<\/p>\n

However, please imagine doing this by hand on a building floor.<\/p>\n

First, here\u2019s the equipment you\u2019ll need to get started.<\/p>\n

 <\/p>\n

1. Engine-powered cutter (Shin Daiwa Engine Cutter<\/span><\/a>)(Electric is also acceptable)<\/p>\n

2. Hammer drill (Makita HR3811<\/a>)<\/p>\n

3. Core Drill (Shibuya TS-095<\/a>)<\/p>\n

4. Seriya (Tsuchiushi Industries Seri-ya 19mm<\/a>)<\/p>\n

5. Thunder (Makita 18V Disc Grinder<\/a>\u00a0<\/span>)<\/p>\n

6. Fiber-optic scope (About 10 mm, with a light<\/a>)<\/p>\n

7, 2.5 kVA generator (Inverter Generator, Output: 2.5 kVA<\/a>)<\/span><\/p>\n

It looks something like this.<\/p>\n

 <\/p>\n

For now, I'll use a hammer drill with a 600 mm \u00d7 \u03c622 bit to drill through 25 cm of concrete.<\/p>\n

After penetration, check the inside with a fiberscope (that\u2019s important in a rescue situation, right?)<\/p>\n

I think it would take about five minutes to drill a hole, provided it doesn't hit any rebar.<\/p>\n

\"Anchor<\/p>\n

For us slope engineers, it's easy since we drill holes about 1,000 mm (\u03c622) into bedrock, right? ^^<\/p>\n

 <\/p>\n

How do I open it from here?<\/p>\n

Should I drill a few pilot holes with a hammer drill before chiseling away?<\/p>\n

Should we set up the core drill and cut out a circle?<\/p>\n

\"Core<\/p>\n

For a momentIt's easier to work with Hatsuru when there are through holes.<\/span><\/strong><\/span>So it seems like it would be best to drill at least a few holes in the core.<\/p>\n

Anyone who\u2019s ever had a core sample taken knows this all too well\u2014concrete comes out pretty easily, doesn\u2019t it?<\/p>\n

The rebar is a bit of a hassle, but the concrete is soft, so it cuts through easily.<\/p>\n

In buildings and such, the compressive strength seems to be around 50 N, but compared to bedrock, lol.<\/p>\n

 <\/p>\n

If you don't want to lose the center piece that would normally fall out when you remove the outer ring,<\/p>\n

I think it would be best to install a few hole-in-anchors and suspend them with wire or something similar.<\/p>\n

 <\/p>\n

The problem is water<\/span><\/strong><\/span>That's right.<\/p>\n

Drilling fluid during core drilling!<\/p>\n

Would it be that easy to find water in an emergency?<\/p>\n

In that case, you'll need both wet and dry blades.<\/p>\n

It depends on the situation which one to use.<\/p>\n

If the concrete is a little thinner, I think a hand-held core drill would work just fine.<\/p>\n

 <\/p>\n

Hatsuru without making a hole<\/span><\/strong><\/span>In that case,<\/p>\n

Cut around the edges with an engine-powered cutter.<\/p>\n

For example, I think a square with sides of 100 cm would work well.<\/p>\n

\"Chiseling<\/p>\n

The red line marks the outer edge; decide on this first, then use the cutter.<\/p>\n

Next, use a utility knife to make cuts along the black lines as needed.<\/p>\n

Insert it until the cutter blade is fully inserted.<\/p>\n

With a standard engine-powered cutter, the blade can penetrate about 100 mm, so I\u2019ll cut all the way through.<\/p>\n

And now I'll start chiseling with a hammer drill!<\/p>\n

 <\/p>\n

The blade to use for this is the Bullpoint!<\/p>\n

Definitely don't use Hirano, lol (it'll take forever)<\/p>\n

MK Blue Point 17H \u00d7 450 mm<\/span><\/a><\/p>\n

<\/a>\"\"<\/p>\n

Use this to chisel away at the square within the selected area, bit by bit.<\/p>\n

I think it\u2019s much easier to chisel away than a concrete surface that doesn\u2019t have a single scratch on it.<\/p>\n

If you see any rebar sticking out, cut it with an angle grinder.<\/p>\n

Once you've chiseled away about 100 mm, use the cutter again and repeat the process.<\/p>\n

If it's okay to chip away the concrete, I'll cut the rebar and then use a chisel to get it done all at once.<\/p>\n

 <\/p>\n

I'm guessing the coring process is incredibly fast. (We run two machines.)<\/p>\n

Ideally, it would be great if you could bring some water and use the Core to get out, but,<\/p>\n

I suppose there are situations at disaster sites where you just can't afford to be that picky, right?<\/p>\n

 <\/p>\n

If you're cutting a large piece, a wire saw might be a good option, but<\/p>\n

It seems like the minimum requirements will suffice for rescue operations, so it probably won't see much use.<\/p>\n

\"Static<\/p>\n

Since this is strictly based on the assumption of a building or similar structure, I think this is what it would look like if we were to handle it with the smallest possible equipment.<\/p>\n

If you want to destroy a specific part all at once,<\/p>\n

Using a static fragmentation agent (Super Blaster) is also an option.<\/p>\n

It cuts through hard rock with ease, so it seems like it would cut through concrete just as easily.<\/p>\n

I think it took about two hours to break down even with the Super Blister (depending on the temperature).<\/p>\n

 <\/p>\n

If materials and machinery could be used where they are best suited, and if civil engineers could exchange ideas with fire and rescue personnel,<\/p>\n

I think we could carry out rescue operations more efficiently.<\/p>\n

Construction companies have a system in place where they take the lead in volunteering during disasters, and<\/p>\n

Everyone here is ready to help anyone in need! (Disaster response agreements with municipalities, etc.)<\/p>\n

It would be great if we could make full use of the technologies we have\u2014both for building and for demolition\u2014even during disasters, wouldn't it?<\/p>\n

 <\/p>\n

There are probably other ways besides the ones mentioned above, but,<\/p>\n

Please give it some thought, everyone.<\/p>\n

 <\/p>\n

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

Hello, everyone. This is Enta. As construction professionals, what do you think of this article? TBS NEWS DIG: \u201cThe real thing is completely different\u2026\u201d Firefighters Demolish \u2018Concrete Walls and Floors\u2019 at the Closed Maru Building for Training. Watching this, I can\u2019t help but wonder if it\u2019s taking too long to chisel through the concrete\u2026<\/p>","protected":false},"author":2,"featured_media":6160,"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":[957,2682,5750,5751,5752,5753],"class_list":["post-49266","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-others","tag-957","tag-2682","tag-5750","tag-5751","tag-5752","tag-5753"],"acf":[],"yoast_head":"\n\u707d\u5bb3\u6642\u3044\u304b\u306b\u901f\u304f\u30b3\u30f3\u30af\u30ea\u30fc\u30c8\u306b\u7a74\u3092\u3042\u3051\u308b\u4e8b\u304c\u51fa\u6765\u308b\u306e\u304b\uff1f - 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