Hello, everyone.
This is Enta.
What happens after temporary anchors are installed?
Well, of course, since this is a temporary structure, we’ll take it down once the permanent construction is complete.
We are removing the items in the reverse order in which they were installed.
In the photo, the structure is being installed from the top, the ground below is being excavated, and temporary anchors are being driven into the ground at the base.
Therefore, we will remove the temporary anchors at the bottom and backfill the area with soil.
After that, the upper anchors will be removed, the area will be backfilled, and the sheet piles will be extracted.
Removal is relatively simple; just cut through the back of the steel pressure plate with an angle grinder.
Since PC steel strands are basically U-shaped, there are always an even number of them.
Once you've cut it in half, everything has been unloaded.
However, for now, we will cut all the pipes and remove the steel pressure-bearing components.
People often say it’s better to cut with a gas torch here, but I think an angle grinder is better.
That's because with a gas cutter, the cut surface melts, so you'll have to cut it again with an angle grinder when you move on to the next step.
It doesn't matter whether you cut it with a gas-powered saw or an angle grinder—the result is the same, but I recommend using the angle grinder.
After that, we'll pull them out one by one.
The PC steel strands are threaded through a special jig and pulled upward using a crane.
The initial load is approximately 1 to 1.5 metric tons.
Sometimes, even if you apply 3 metric tons or 5 metric tons of force, it still won't come out.
In that case, please stop using that PC steel wire for now and use something else instead.
As for the last remaining PC strand, you can try pulling it from the opposite side—if it moves, that’s fine, but,
If it won't budge, you can usually pull it out by applying a jolt with a backhoe or similar equipment.
If that doesn't work, your only option is to remove it using a center-hole jack.
This kind of thing happens from time to time, so please be aware of it.
Installation
Sheet pile installation → Installation of first-tier anchors → Installation of struts → Tensioning → Excavation → Installation of second-tier anchors → Installation of struts → Tensioning → Main construction work
Removal
Remove and dismantle the second-tier anchors → Remove the formwork → Backfill → Remove and dismantle the first-tier anchors → Remove the formwork → Backfill
The more steps there are, the more times you'll have to do this.
