The deformed mechanism of pushing a long rod into a pipe has been analyzed from the point of view of elastic stability. In the case of pushing a long rod into a pipe, the rod is in a complicated manner deformed. At first, the rod is a linear figure, then, it is transformed into an s-shape, and finally, into a spiral figure. We describe the relationship between the critical pushing distance in a pipe and the dynamic characteristics of a rod, such as weight per unit distance, bending stiffness, and friction coefficient to the pipe wall through theoretical and experimental investigations. A design standard of a long rod structure has been clarified by these studies.
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