Is a thicker cement slurry more effective?
Hello, everyone. This is Enta. You know how you take test specimens (cement slurry) at job sites, right? Like for ground anchor work, rebar insertion, or piles. There are all kinds of projects, but when you’re making these test specimens, if they’re extremely soft, you just throw them away, right? lol But on the other hand, if they’re on the hard side…
I still think digging with water is the fastest way to dig a hole!
Hello, everyone. This is Enta. These days, drilling is more about using water and air than just water, isn’t it? Water-only drilling used to be the norm. (Water and air is a more recent drilling method.) To clean the inside of the casing, we used to pour water liberally and move the inner rod up and down to flush it out…
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)…
Considering the Angle of the Reaction Wire During Suspended Drilling (A Theoretical Exercise)
Hello, everyone. It’s Enta here. It’s still not getting any cooler at all, lol. It’s taking a while to recover from the physical exhaustion caused by the heat, isn’t it? Summer is a really tough season for an old guy like me!! And today marks the start of September! It’s already the end of the year, lol. For those of you who are thinking ahead, it’s already the new year, right!? And then there’s Maru…
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 …
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…
When it comes to formwork for rebar insertion and ground anchor work, void pipes offer better quality! (For Designers)
Hello, everyone. This is Enta. When it comes to cutting out openings for rebar insertion or anchor installation during the design phase, what do you think is the best approach? I think designers probably already decide which material to use based on their past experience. And they just take it for granted that…