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How to install expansion bolts?

Update:24-09-2021
Summary:

The expansion screw is composed of a screw and an expan […]

The expansion screw is composed of a screw and an expansion tube. The tail of the screw is cone-shaped, and the inner diameter of the cone is larger than the inner diameter of the expansion tube. When the nut is tightened, the screw moves outwards, and the conical part moves through the axial movement of the thread. A large positive pressure is formed on the outer peripheral surface of the expansion tube. In addition, the angle of the cone is small, so that the wall and the expansion tube Frictional self-locking is formed between the cone and the cone to achieve a fixed effect.

The expansion screw is composed of a screw and an expansion tube. The tail of the screw is cone-shaped, and the inner diameter of the cone is larger than the inner diameter of the expansion tube. When the nut is tightened, the screw moves outwards, and the conical part moves through the axial movement of the thread. A large positive pressure is formed on the outer peripheral surface of the expansion tube. In addition, the angle of the cone is small, so that the wall and the expansion tube Frictional self-locking is formed between the cone and the cone to achieve a fixed effect.

The spring washer on the expansion screw is a standard part. Because its opening is staggered and elastic, it is called a spring washer. The function of the spring washer is to pierce the nut and flat washer with the sharp corners of the wrong mouth to prevent the nut from loosening.

Points for attention when installing expansion bolts (expansion screws) in actual use:
1. Drilling depth: The relevant information describes the length of the expansion tube, but I found that this depth is not enough during the specific construction, which may be related to the amount of debris in the hole, so it is better to be about 5 mm deeper than the length of the expansion tube. As long as you are greater than or equal to the length of the expansion pipe, the length of the expansion bolts left in the ground is equal to or less than the length of the expansion pipe.
2. The requirement of expansion bolts on the ground is of course the harder the better, it also depends on the force of the object you need to fix. Installed in concrete (C13-15), the force strength is five times that of bricks.
3. After a M6/8/10/12 expansion bolt is correctly installed in the concrete, its ideal static force is 120/170/320/510 kg respectively. (Note that vibration will loosen the bolts)

Expansion bolt (expansion screw) detailed installation steps:
1. Choose an alloy drill bit that matches the outer diameter of the inner expansion bolt, then drill the hole according to the length of the inner expansion bolt, drill the hole as deep as you need for installation, and then clean the hole.
2. Install the flat washer, spring washer and nut, screw the nut to the bolt and the end to protect the thread, and then insert the inner expansion bolt into the hole.
3. Turn the wrench until the washer and the surface of the fixed object are flush. If there is no special requirement, usually tighten it by hand and then use the wrench for three to five turns.
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