1、 Foundation screw construction and installation

　　The tensile capacity of the anchor bolt is the tensile capacity of the round steel itself. The size is equal to the cross-sectional area multiplied by the allowable stress value, which is the allowable tensile capacity in design. Anchor bolts are generally made of Q235 steel, which is smooth and round. Screw thread steel (Q345) has high strength, so it's not easy to make the screw thread of nut. For the smooth round anchor bolt, the buried depth is generally 25 times of its diameter, and then make a 90 degree hook about 120mm long. The purpose of burying depth and hook is to ensure the friction between bolt and foundation

　　2、 Type and specification of foundation screw

　　Anchor bolts can be divided into fixed anchor bolts, movable anchor bolts, expansion anchor bolts and adhesive anchor bolts. According to the shape, it can be divided into L-shaped embedded bolt, 9-shaped embedded bolt, U-shaped embedded bolt, welding embedded bolt and bottom plate embedded bolt. According to the national standard GB / t799-1988, the specifications of anchor bolts are: M6, M8, M10, M12, M16, M20, M24, M30, M36, M42, m48m. The length range is 80-1500.

　　3、 Function of foundation screw

　　Anchor bolt is mainly used in cement and concrete. It is poured together with the foundation to fix the equipment without strong vibration and impact; Movable anchor bolts are used to fix heavy machinery and equipment with strong vibration and impact; Expansion anchor bolts are often used to fix simple equipment or auxiliary equipment; Bonding anchor bolt is a kind of anchor bolt commonly used in recent years, and its method and requirement are the same as that of anchor foot bolt.