Allen Bolt Allen Bolt Socket head cap screw DIN912 Socket screw


 High-strength bolt technology (hereinafter referred to as high bolt) is one of the commonly used connection methods in steel bridge connection. It has been widely used in bridge structures in recent years. The United States and Japan are leading the world in research in this field.

The connection of the high bolt can be divided into a friction type high bolt connection, a pressure type high bolt connection, and a torsion shear type high bolt connection according to the force transmission manner.

Allen Bolt Allen Bolt Socket head cap screw DIN912

It is not clear when the high-rise is started. However, it is documented that the United States was the first country in the world to start researching high-tie, starting in the 1940s. Japan began to use high bolts in the 1950s, and for the first time used a railway bridge built in 1954 as an opportunity, and then used a large number of high bolts on the railway bridge. In 1961, the technical standard for high bolting was also established, namely the Japanese industrial standard JIS B 1186. Subsequently, the Japan Highway Association published and published the "Design Guide for Friction Connections of High-Strength Bolts for Highway Steel Bridges".

Since the early 1960s, China's railway steel bridges have used high-bolt connections instead of rivet joints, and have been in existence for more than 50 years. Nowadays, the railway steel bridge site connection mainly adopts two connection technologies: high bolt connection and welded connection. There are also many high-bolt connections for the construction of steel girders and truss arch bridges of highway bridges.

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