{"id":38189,"date":"2019-02-09T08:00:37","date_gmt":"2019-02-08T23:00:37","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=38189"},"modified":"2026-05-16T23:56:01","modified_gmt":"2026-05-16T14:56:01","slug":"temporary-anchor-removal-process","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/temporary-anchor-removal-process\/","title":{"rendered":"Removing Temporary Ground Anchors | Why Use a Thunder to Cut PC Steel Cables and Tips for Pulling Them Out"},"content":{"rendered":"

Hello, everyone.<\/p>\n

This is Enta.<\/p>\n

Removal of Temporary Anchors<\/strong>I'll write about that.<\/p>\n

This is a step that always follows the completion of the main construction work; while it may seem unremarkable, it\u2019s a task that often falls on the critical path of the project.<\/p>\n

Let me say this up front: once you get used to this entire process\u2014from unloading to cutting and pulling\u2014Work that can be performed even under the prime contractor's direct management<\/strong>That's it.<\/p>\n

Since calling in professionals like us comes with a corresponding cost, I think you might want to consider handling it on your own.<\/p>\n

\"Temporary<\/p>\n

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Reasons for Cutting the Back with a Thunder<\/h2>\n

Unloading isThe back of the steel pressure plate using a grinder (disc grinder)<\/strong>, which means you cut the underside of the anchor head.<\/p>\n

Since PC steel strands are basically arranged in a U-turn pattern, they always come in an even number of strands, so in theory, the unloading process is complete once half of them have been cut.<\/p>\n

However, considering the setup for the next process, I will remove the steel pressure plate after cutting all the pieces.<\/p>\n

If there are enough people, we can also remove them from the back!<\/p>\n

The main reason for choosing an angle grinder over gas cutting is,The cut surface is clean<\/strong>That's why.<\/p>\n

With PC steel strands, when the angle grinder blade cuts into the strand halfway through a single strand, you can feel the remaining portion snap off on its own due to the tensile force.<\/p>\n

If the cut surface is clean, then the next step is...Wedge-type and clamp-type drawing dies engage smoothly during the drawing process.<\/strong>That is the advantage.<\/p>\n

If you cut with a gas torch, the cross-section melts and forms a lump, so you often end up having to recut that area with an angle grinder, which creates extra work.<\/p>\n

\"Cutting<\/p>\n

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Comparison with Gas Cutting and Fire Risk<\/h2>\n

Some people say, \u201cIt\u2019s dangerous unless you use gas.\u201d However, I believe that, depending on the situation, an angle grinder is actually the safer option.<\/p>\n

In some cases, grease, drilling fluid, and rust-preventive oil from inside the sheath may remain around the head of the temporary anchor, and<\/p>\n

The temperature of an oxy-acetylene flame is approximatelyAround 3,000\u00b0C<\/strong>Since it reaches that temperature, the oil may suddenly catch fire.<\/p>\n

Even with a thunderbolt, there is still a possibility\u2014albeit a small one\u2014that a spark could ignite the oil if it comes into contact with it.<\/p>\n

However, the energy it provides as an ignition source is less than that of a gas flame, and the direction in which sparks fly can be controlled to some extent.<\/p>\n

In practice, the choice of cutting method should be based on the amount of oil remaining around the head and the condition of the surrounding protective covering.<\/p>\n

In fact, when cutting with acetylene gas, there is a more than 90% chance of ignition.<\/p>\n

Water and fire-fighting equipment are required.<\/p>\n

And it releases toxic gas for no good reason.<\/p>\n