Expansion Screw Removal Method

1. remove the expansion screw first remove the screw cap, and then use a hammer to the screw inside the wall, and then use pliers to the screw outside the iron first to draw out, pull out the iron, after using pliers to clamp the screw, while shaking side to pump out; Up and down knock, shake a few, can be very easy to come out, some very strong this or pull out, with chisel in the surrounding chisel point and then turn the edge to pull out, such as this also does not come out, with a six-millimeter hammer drill directly drilled, the depth is not less than the depth of the screw, Then use pliers to clamp the outer ring side turn to pull out, so that the most stubborn pull out.

2. first of all, the exposed bolt part knocked into the wall, so that the bolt expansion part and the jacket expansion tube separated. Then use the sharp-mouthed pliers to clamp the expansion jacket to pull out, pull out the expansion jacket, in the expansion tube when the screw to hold back is, the bolt is easy to take out. If the knock is not loose, you can only use the impact drill on the outside of the sleeve to loosen, and then make up the wall.

3. the outside saw off with a steel saw, and then put it all into the wall, the future expansion bolt rust will squeeze through the wall whitewash layer.

4. corrosion with sulfuric acid. But the method is unsafe and environmentally friendly, and has a greater impact on the walls. Not recommended!