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装配式钢筋混凝土桥上部构造是把预制的钢筋混凝土块件一块一块的吊装到墩台上,然后连结起来,成为一个整体的。这样做有许多优点:1)施工快速;2)构件系预制,能延长施工季节,可以避免由于冬季施工而增加工程费用;3)可以利用机械,减少工数,保证质量等。因此,当有适当的装吊设备及运输工具时,应该尽量的修建这类装配式桥梁。现时一般的装配式钢筋混凝土桥上部构造,系按照苏联1954年公路桥涵标准图第10～11册(人民交通出版社有翻译本出版)修造的,跨径有7.5、10.0、12.5、15及20.0公尺五种。载重分汽-13拖-60和汽-18拖-80两种。净空为净-7。远些上部构造的主梁块件系丁形断面,主钢筋用5是钢做成的螺纹钢筋,混凝土标号为250到300号。所以钢筋和混凝土标号都比以往普通钢筋混凝土桥所用的高。5
The upper part of the prefabricated reinforced concrete bridge is constructed by lumping prefabricated reinforced concrete blocks one by one onto the piers and connecting them together to form a single unit. There are many advantages to doing this: 1) rapid construction; 2) prefabrication of components to prolong the construction season and avoid the cost of construction due to winter construction; and 3) the availability of machinery, the reduction of the number of workmanship and the guarantee of quality. Therefore, when there is proper equipment and transportation equipment, such assembly bridges should be built as much as possible. At present, the general structure of the upper part of the prefabricated reinforced concrete bridge is constructed according to Nos. 10 to 11 of the standard map of the bridge and culverts of the Soviet Union in 1954 (translated by China Communications Press), and there are 7.5,10.0,12.5,15 and 20.0 spans Five meters. Load sub-steam -13 drag -60 and steam -18 drag -80 two. Clearance for the net -7. Farther the upper part of the structure of the main beam block Ding section, the main steel with steel reinforcement made of steel 5, concrete numbered 250-300. Therefore, rebar and concrete are higher than the standard used in ordinary steel bridge. 5