The portable jib crane on wheels is a lifting machine that is used with an electric hoist or a hand chain hoist. It is a small lifting equipment that is easy to move and popular. SEVENCRANE portable jib crane on wheels has a larger suspension span and is economical and durable. It is equipped with a built-in travel agency, which is safer and smaller in size, which is especially beneficial to increasing the stroke of the hook. In a freestanding portable jib crane on wheels, all steel plates obtained are placed on the base of the jib. Computer programs currently in use tend to only pay attention to the uniform distribution of longitudinally curved steel bars across the floor of the box girders. Although the longitudinal steel bars are sufficient. However, according to the characteristics of the stress analysis of the actual situation, due to the stress concentration at the root of the cantilever end, the fiber mesh at the roots at both ends gradually decreases.