To provide an integral structure system having vibration resistance by mounting a double blade on a corner of a lower structure, or mounting a bearing washer, and mounting a spring on an upper structure.

A double blade 10 is enlarged in left and right directions of a corner part of a lower structure of a hook bolt 4. The double blade 10 collides with an I shaped steel side surface 18, and thereby, rotation of a bolt 4 is prevented. A square washer 6 is laid on a bridge sleeper 2 as an upper structure for reinforcing it, spigot washers 15 are fit on upper and lower parts of a coil spring 14, the hook bolt 4 is vertically stabilized so as to prevent breakage, and double nuts 5 are fit thereto. Rotation of the bolt is completely stopped by such an above structure. The bolt 4 is lifted up by the coil spring 14, elastic force is applied even when vertical vibration and lateral movement are caused largely, and thereby, stability is ensured. Since an expansion width of the spring 14 is large, a regulation packing is formed in a minimum size, workability is improved, and it is blocked that the hook bolt 4 is rotated together therewith.