The method of use is different
Although the two are similar in mechanical function, they are very far apart in terms of equipment. The equipment method of the rear-reaming anchor bolt is relatively complicated. After drilling the straight hole, it needs to be reamed independently, and the reaming requires the use of a special reaming drill. Taking the M12 back-expanded anchor bolt as an example, its reaming standard reaches M24, and it is relatively easy to touch the steel bar during installation. The installation method of self-expanding bottom anchor bolts will be much simpler. On the one hand, it can save a lot of man-hours without the need for independent reaming. On the other hand, it can be equipped with an electric hammer, which is very labor-saving when installing.
The standard for sale is different
As mentioned above, when we mentioned the rear expansion bottom anchor bolt equipment, we simply encountered the problem of steel bars. Therefore, the standard of the rear expansion bottom anchor bolt selected has great limitations, which is also difficult to find in the market. The primary reason for bottom anchors. As for the self-expanding bottom anchor, since there is no independent reaming, the probability of hitting the steel bar is relatively small. Therefore, the on-sale standard of self-expanding bottom anchors can even reach M20. However, when using large standard anchors, try to understand the arrangement of the steel bars in the concrete first, so as to formulate a reasonable drilling plan.
The safety function of the two
Let’s first discuss the different methods of self-expanding bottom anchor bolts on the market. There are mainly two types. One is the self-expanding bottom anchor bolt using the diamond cutter head, and the other is the adjustment of the withdrawal height, slope and The way to block the sleeve comes from the reamed anchor. The hole reaming effect of the first type is better than that of the second type, but the price is expensive, and the one-time use of the diamond bit will inevitably lead to waste. The second type of anchor bolts that complete the self-expanding bottom by mechanical structure can only partially cut the concrete during installation, which cannot achieve the effect of the former self-expanding bottom anchor bolts, but fortunately, the construction is simple.
Then, although the construction of the bottom-expanded anchor bolt is more complicated, the operation of pre-expanding the hole can make the anchor bolt expand more in place after the equipment, and the anchor bolt will not be directly pulled out during the pull-out test. Small standards such as M12 rear-expanded bottom anchor bolts and self-expanded bottom anchor bolts have very close tensile forces, but when the standard is large, there is some distance between the mechanical functions of the two. However, the actual demand for M12 anchor bolts can account for more than 60%.
Differences from Expanded Anchors
The expansion anchor bolt is a kind of mechanical anchor bolt that forms a corresponding anchoring effect through a special mechanical structure and the friction force of the concrete hole wall after the equipment is in place. The force of the expansion anchor bolt will be larger due to the different types of anchor bolts, but it is difficult to reach the level of the rear expansion anchor bolt and the self expansion anchor bolt. It is best to understand the expansion anchor bolt and expansion anchor bolt. The difference between the large anchor bolts can determine which anchor bolt should be used in construction.
The construction personnel on some projects do not know the expansion anchor bolt, and often mistakenly use the expansion anchor bolt as the expansion anchor bolt, which is really dangerous. Before construction, it is expected that various manufacturers can provide corresponding technical disclosures while selling products, so that construction personnel can understand the application methods of products and the importance of curtain wall engineering safety.
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