Bolt is a kind of mechanical parts, which is composed of head and screw. It needs to be used with nut to fasten and connect two parts with through holes. There are many names for bolts, some of them are called screws, fasteners and screw screws. Bolt is a tool which can be used to fasten objects step by step according to the mathematical and physical principles of rotation and friction.
The classification of bolts: according to the stress mode of connection: ordinary, with reaming holes; according to the head shape: Hexagon head, round head, square head, countersunk head, etc.; according to the length of thread: full thread and non full thread; according to the thread shape: coarse thread and fine thread; according to the performance, it is divided into eight grades: 3.6, 4.8, 5.6, 5.8, 8.8, 9.8, 10.9, 12.9; according to the performance, it is divided into eight grades; According to the bolt manufacturing accuracy, it can be divided into three grades: A, B and C.
Anchor bolt is an anchor component product that anchors the connector to the base material, which is divided into mechanical anchor bolt and chemical anchor bolt. The source is jgj145-2013 technical specification for post anchorage of concrete structure. The base materials for anchor bolt anchorage are divided into reinforced concrete, prestressed concrete or plain concrete components; those not used as anchorage base materials include: freeze-thaw damaged concrete, corrosion damaged concrete, seriously cracked concrete and non compacted concrete.
Chemical anchor bolt is a new type of metal fastening material, which is rented by chemical agent and metal rod body. Chemical anchor bolt is a new type of anchor bolt after expansion anchor bolt. It is a kind of composite component that the screw is cemented and fixed in the drilling of concrete base material by special chemical adhesive. Chemical anchor bolt is divided into ordinary chemical anchor bolt and special inverted cone chemical anchor bolt.
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