近年来,先张法粗钢筋预应力混凝土预制构件在铁路和公路桥梁中得到了广泛的应用。铁路部门以亜25、45SiMnV精轧螺旋钢筋制成中、小跨预制桥梁;公路部门以亜25Ⅳ级钢筋制成大量轻巧的预应力梁,然后在工地组装,或组成组合截面。我厂目前生产的20米以下的先张预应力梁都是以亜25的螺旋粗钢筋为主筋的,冷拉 In recent years, the pre-tensioned pre-stressed concrete pre-stressed concrete elements have been widely used in railway and highway bridges. The railway department uses prefabricated bridges of medium- and small-span prefabricated bridges made of 亜25 and 45SiMnV fine-rolled spiral steel bars; the highway department uses 亜25 grade IV steel bars to make a large number of lightweight prestressed beams, which are then assembled at the construction site, or form composite sections. The pre-tensioned prestressed beams under 20 meters that our factory currently produces are all made of 亜25 thick spiral steel bars and are cold-drawn.