提高货车包括有车顶的车辆的修理质量是铁路车务部门职工急待解决的问题之一。正如对棚车技术状态的分析表明,车辆送修最经常的原因是车体的损坏——地板、墙板的损坏,端墙立柱和斜撑、车顶的折断或破损,车门的损坏或丢失。地板通常是在装卸货物时损坏的,而墙板、端墙立柱及斜撑则主要是由于车辆从驼峰的溜放速度增大而损坏的。车顶的腐蚀损伤与其使用年限有关,一般情况下,使用年限不超过11～13年。并且,假如车顶的机械破损和呈孔洞和裂纹等 Improving the quality of repair of trucks, including those with roofs, is one of the urgent problems to be solved by railway vehicle service workers. As the state of the art of box cars indicates, the most common causes of vehicle repairs are body damage - damage to floor and wall panels, studs and braces on end walls, broken or damaged roofs, and damage or loss of doors. The floor is usually damaged during loading and unloading of goods, while the wall panels, end wall studs and braces are mainly due to the speeding up of the vehicle from the hump. Roof corrosion damage and its service life, under normal circumstances, the service life of not more than 11 to 13 years. And, if the roof of the mechanical damage and were holes and cracks