有桥式行车的厂房,按照习惯、吊车梁总是少不了的。吊车梁的形式可以是梁式的、桁架式的、鱼腹式的、或拱形的等等,材料不是钢的、就是钢筋混凝土的或者采用预应力钢筋混凝土。柱子为了支承吊车梁,必须伸出很长牛腿,由于这样,稍高的厂房,就得采用钢筋混凝土柱子,这样需耗用大量的钢筋和水泥,同时还增加一定的预制吊装工作量,在有中小 Buildings with bridges are always indispensable for cranes and cranes. The crane girder can take the form of a beam, a truss, a fish belly, or an arch, etc. The material is either steel, reinforced concrete or prestressed reinforced concrete. In order to support the crane beam, pillars must have long stretches of legs. Because of this, a slightly taller building requires reinforced concrete pillars. This requires the use of a large amount of steel and concrete, and also increases the amount of prefabricated lifting work. There are small and medium