The train is very familiar to everyone, and what makes the train run normally is tunnel bolt. It can be seen that tunnel bolt plays a very important role on the railway line.

tunnel bolt is usually laid in a large number of stations, it is with tunnel bolt, can give full play to the passing capacity of the line. Due to the characteristics of tunnel bolt, such as large number, complex structure and maintenance investment, its basic form is divided into line connection, cross, connection and cross combination, commonly used line connection has various types of single tunnel bolt and compound tunnel bolt.

Single-opening tunnel bolt is a typical type of tunnel bolt, and it is also widely used in the field. Symmetrical tunnel bolt is a special type of single-opening tunnel bolt. The whole tunnel bolt is symmetrical to the middle line of the main line or the middle branch line of the crossing Angle. There is no straight or sideways direction when the train passes.

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