Safe Work Spaces on Scaffolding for Rotary Percussion Work
Hello, everyone. This is Enta. Let’s say you’re performing skid-type drilling for ground anchor installation or rebar insertion. How wide do you think the scaffolding edges need to be in that case? I’m referring to the scaffolding on both the control panel side and the operator’s side relative to the drilling location. Often, the width of the scaffolding (horizontally)…
I Tried Core Drilling Using the Wireline Sampling Method!
Hello, everyone. This is Enta. I’ve been using a new tool for my work since a few days ago. It’s called a Soundscope. Have you heard of it? It’s a stethoscope that lets you listen to the sounds transmitted through metal. With the current “wireline” method, core boring…
Risks and Troubleshooting in Grouting Operations (Part 2)
Hello, everyone. This is Enta. Risks and Troubleshooting in Grouting Work (Part 1) This is a continuation of my previous post. Since 1 m³ equals 1,230 kg (approximately 50 bags), this means that for the rebar insertion work we discussed the other day—with a borehole diameter of φ90 and a borehole depth of 5.0 m—we would have inserted about 10 times the amount specified in the design…
Risks and Troubleshooting in Grouting Operations (Part 1)
Hello, everyone. This is Enta. In rebar insertion and ground anchor projects, we inject cement slurry. If the cement slurry keeps flowing in, how far should we inject it? For example, suppose there is a rebar insertion project with a borehole diameter of 90 mm and a depth of 5.0 m. The injection volume is …
In ground anchor construction, wouldn't it be possible to minimize risks by ensuring that the grouting of the free length is done more thoroughly than that of the anchorage section?
Hello, everyone. This is Enta. Do you know what this is? The distinctive feature is the circular pattern leading toward the center, right? This is pressure-cured concrete, which was hardened while under pressure. (I’ve shown this before, lol.) The cement slurry from the packer goes inside…
Is tension control in ground anchor construction really pointless after all!?
Hello, everyone. This is Enta. The other day, I came across an interesting post on Mr. Ota’s blog at Ota Geo. “Bit by Bit 2: Anchor Tests Cannot Guarantee the Performance of the Anchored Section.” The gist of the article is that since grout is injected into both the anchored section and the free length, quality assurance tests (multi-cycle tests) are…
Using an angle-adjustable base can lead to some really tricky situations!
Hello, everyone. This is Enta. Are you managing your nerves? It’s really tough, isn’t it!? Getting everything lined up!!!!! Since people from the manufacturer’s development department are reading this blog, I’m going to go ahead and write this lol. This time, I’m also using an angle adjustment base. Because of that…
The Relationship Between the Number of Cuts on a Drill Bit and Drilling Speed | The Trade-off Between Impact Force and Wear
Hello, everyone. This is Enta. Actually, I appeared live on Ameba TV the other day lol. The segment was titled, “Is it a no-no to jump in to help? How do you save someone who’s drowning? We ask a former international rescue team member,” and I was invited to appear based on my past experience saving a friend. When you share information online, you never know what might happen…
The drill bits—which were supposed to determine how fast the drilling went—turned out to be all too good!
Hello, everyone. This is Enta. A long time ago (about 10 years ago), I was working as a rebar installer on a super-hard mountain. The site had double-walled pipes (why?), and it was just impossible to dig. The mountain was so hard!! But since we couldn’t change the plan, we had no choice but to dig, so we dug…