The difference between the bottom anchor bolt and the expansion anchor bolt, the following small expansion anchor bolt manufacturer Xiaobian for everyone to introduce:
The construction will use a variety of different anchor bolts. The use of expansion anchor bolts is naturally large. Many construction workers have not used the anchor bolts for several years. Of course, whether it is a bottom anchor or an expansion anchor. In the category of mechanical anchors, this paper will explain the difference between the bottom anchor and the expansion anchor.
Large difference in force effect
The bottom anchor bolt mainly includes two kinds of self-expanding anchor bolts and rear expansion anchor bolts. The former can be reamed at the same time when installing, and the rear-expanding anchor bolts need to be reamed in advance. The force is in the form of a mechanical lock. There are many types of expansion anchors. Conventional anchors such as Anka anchors and internal anchor bolts are all expansion anchors. These appearances are easier to distinguish. However, there are also expansion anchor bolts similar to the style of the rear-expanded anchor bolt, and the amount of the expansion anchor bolt is also relatively large. The rear-expanded anchor bolt provided by our company is also often regarded as an expansion anchor bolt. The shape and rear expansion of the expansion anchor bolt are similar. The anchor bolts are the same, but they are subjected to the expansion friction and are obviously different from the rear expansion anchors. In fact, if you discern carefully, you will find that the sleeve wall of the expansion anchor is thinner, and the wall of the rear anchor bolt is thicker. If the rear expansion anchor is used as an expansion anchor, its force is not even as good as that of the expansion anchor (the sleeve wall thickness is not thick when the hole is not reamed).
It is said that the bottom anchor bolt will be pre-reamed or self-reaming. The force is in the form of a mechanical lock. Because of the small hole at the bottom and the large straight hole, the force is generally up to the limit of the bolt material. For example, the tensile load capacity of the bottom anchor of the M12 5.8 grade carbon steel (35# steel) can reach 60kN, and the damage form is the anchor bolt. The expansion anchors are different, and the expansion friction is subject to greater uncertainty. Some anchors such as Anka will also generate displacement in the drawing experiment, and the force is often small, and the average force even reaches the same specification. Half of the bottom anchor is pulled out and the bolt is pulled out. Because of the different ways of exerting force, the difference in force effect is the most important difference between the two.
Different scope of application
GB 50367-2013 "Concrete Structure Reinforcement Design Code" stipulates:
16.1.3 For mechanical anchor bolts for load-bearing structures, a rear-expanding anchor bolt with a locking effect shall be used. Such anchor bolts are divided into three types: self-expanding bottom, mold expanding bottom and adhesive-die expanding bottom according to different structural construction methods; adhesive anchor bolts for bearing structure should adopt special inverted tapered adhesive. Anchor bolt. The self-tapping screws are not part of the anchor system and should not be designed and calculated according to the anchor bolts.
16.1.4 In the structure of the seismic fortification zone and the component directly subjected to the dynamic load, the expansion anchor shall not be used as the connection of the load-bearing structure.
To sum up briefly, the load-bearing structure cannot be fixed by using expansion anchors. Instead, it is stipulated that the bottom anchor or the inverted cone anchor must be used.
Large price difference
Because the material and weight of the expanded anchor bolt material are better than the expansion anchor bolt, the price is naturally more expensive than the expansion anchor bolt. However, price and safety are directly proportional. We must comply with national regulations during construction, and ensuring safety is the premise of the entire project. Taihao Warehouse Haojing Technology Co., Ltd. is located in No. 188, Luxin Road, Taicang City. It is a professional manufacturer of expansion screws.
