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(二)跨径20～30米的预制梁15米以上跨径的预制梁由于构件的长度及重量较大,一般在公路上使用汽车拖运就感到不便。但是在装配式预制构件采用得最多的苏联和美国,由于他们公路和铁路都比较发达,运输不成问题,可以较多地集中生产大批的定型构件。所以大型构件长达40米,重达50吨都还认为在公路桥上是可以利用的。除了利用铁路运输以外,在公路上的运距在100～150公里的范围内都还是经济的,苏联的经验40米的预制长梁在山区公路曲线半径在15米以上也可以运送。这样,就对集中厂制和发展先张法预应力钢筋混凝土梁的工业化生产有利,简化制造过程便于连续生产,扩大其供
(II) Prefabricated Beams with a Span of 20 to 30 Meters Prefabricated Beams with Span of 15 Meters or More Due to the length and weight of the components, it is generally inconvenient to use hauling vehicles on the road. However, in the Soviet Union and the United States, where prefabricated prefabricated structures were the most used, because of their relatively developed highways and railways, transportation was not a problem, and a large number of stereotyped structures could be more concentrated. So large components up to 40 meters, weighing 50 tons are also considered in the bridge can be used. In addition to the use of rail transport, the distance on the highway in the range of 100 to 150 km are still economical, the Soviet experience of prefabricated long girder 40 meters in the mountain road curve radius of 15 meters or more can also be transported. In this way, it is advantageous to the industrialized production of the centralized factory system and the development of pretensioned prestressed reinforced concrete beams, and the simplified manufacturing process facilitates continuous production and expansion of its supply