Technical Problems Existing in Expansion Friction Bolts

1. Poor product safety and reliability: Because the stress point of traditional expansion bolts is limited to the top of the bolt, the expansion bolts connected to the building’s air conditioners, billboards, pipes, electric poles and other objects are produced under the external force of vibration and wind. Leverage. This kind of leverage will cause the force point of the expansion bolt connected to the building to produce hundreds of times the force. The strong force forces an expansion point of the expansion bolts implanted in the building to produce frequent frictional movements with the drilling holes of the building. As a result, the tightened bolts are gradually loosened, resulting in anchoring equipment such as air conditioners and billboards on the building. Falling, causing injuries.

2. Poor product quality: Expansion bolts are imported products. Due to their simple structure, low technical content, and no intellectual property protection, my country's production plants have grown rapidly. Since the early 1980s, it has now grown to about 1500 manufacturers. Most of them are produced in small workshops. With the increase of manufacturers and output, the supply of products exceeds demand. However, the disorderly competition in the market in the later period caused the quality of expansion bolts to drop significantly, so that many expansion bolts were never tightened, and even encountered the phenomenon of expansion rods being screwed out. Therefore, many places stipulate that expansion bolts cannot be used, (but really good quality expansion bolts, such as imported ones, are actually more than enough for curtain walls.) Only chemical bolts can be used. The fate of domestic chemical bolts is the same as that of expansion bolts. Due to the fierce market price competition, some manufacturers have drastically reduced the quality of their products in order to reduce costs! (Guide: Introduction to car repair gecko anchors)

3. Due to the small expansion point area of u200bu200btraditional products, high pressure and uneven distribution of force points, it will cause greater damage to the building. Due to the influence of the external leverage, the powerful force is concentrated on an expansion point, which increases the damage and destruction to the building. Especially when the installation distance of two expansion bolts is relatively short, when the two expansion points are parallel, the stress of the expansion point is greater than the ability of the building to withstand, and it is more likely to cause damage and destruction of the building.

Despite this, expansion bolts play an irreplaceable role in some areas where there is no requirement for vibration prevention. In addition, the quality of domestic products is not very high, which affects its use function and scope. If it is a high-quality expansion bolt, it can be used in more engineering fields.

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