高强螺栓（High-strength bolt）.doc

高强螺栓（High-strength bolt） High strength bolt is high strength bolt, which belongs to a standard. The high-strength bolt is mainly used in steel structure engineering, steel structure steel plate used to connect point connection. High strength bolt consists of torshear type high strength bolt and six angle high-strength bolts, high strength and large angle of six high strength bolts belonging to the ordinary screw, and torshear type high strength bolt is improved while the big six angle bolts, in order to better the construction. The construction of high strength bolts must first end tight tight, tight bolts with early impact type electric wrench or adjustable torque electric wrench; and the end of the tight bolts have strict requirements, the final tightening of torshear type high strength bolt must use torshear type electric wrench, final tightening torque type high strength bolt must use torque type electric wrench. Six strong angle bolt by a bolt, a nut, a washer, two. Torshear type high strength bolt consists of a bolt, a nut, a washer Grade。 The mechanical properties of carbon steel: metric bolt level can be divided into: 3.6, 4.6, 4.8, 5.6, 5.8, 6.8, 8.8, 9.8, 10.9, 12.9 a total of 10 performance levels. Stainless steel is divided into 60,70,80 (austenite); 50,70,80110 (martensite); 45,60 (iron bainite) three. High strength bolt connection has the advantages of easy installation, can be installed quickly and can be removed and high bearing capacity, good mechanical performance, safety and reliability etc.. It is characterized by: (1) force structure improvement. The friction type high strength bolt force by friction plate surface transfer, load transfer area, the stress concentration phenomenon has been improved, to improve the fatigue strength of the member. (2) less amount of bolt. High strength bolt bearing capacity, a diameter of D = 40 boron steel high strength bolt bearing capacity is 22 mm: A rivet diameter of 23 mm shear strength for: The bearing capaci