Joint, main beam of container semi-trailer provided with the joint and the connecting method thereof

摘要

A main beam of a container semi-trailer provided with the joint, and the connecting method thereof. The joint is used to connect a main beam and has a first connecting plate connected to the main beam; a second and a third connecting plate secured to the same side of the first connecting plate and spaced apart to each other; and a fourth connecting plate slantingly connected between the second and third connecting plates.