Gantry is made of FRP, which is often used to install headlights, water tanks, radiators and other automobile parts. The damage of the gantry usually means that the front of the car has an accident, and the damage scope involves the bumper, anti-collision beam, middle net, hood and other components. Some portal frames are welded parts, which may leave obvious scars after replacement, which has a great influence on the identification of used cars. In a frontal accident, the shock wave can easily damage the longitudinal beam. Even if the longitudinal beam is not repaired, the vehicle handling problem caused by the collapse of the unilateral longitudinal beam can not be ignored. Car door frames are made of glass fiber reinforced plastic, which can be divided into water tank frame and front frame. Unlike the grille, the grille is where air enters. Gantry is used to install headlights, water tanks, radiators and other parts. It can also be used in the field of containers and lifting equipment. For example, mobile crane gantry can be widely used in small and medium-sized factories, storage and transportation, material transportation and other occasions, with a wide range of applications. Gantry consists of five parts: beam, column, chassis, guide beam and fulcrum, which support the weight of lifting equipment. Two columns, such as Panlongzhu, are named Longmen.