450型桥是大型装配式钢结构桥梁，具有在各种自然条件下快速组装成型，荷载能力强，跨越能力达到80米长，目前为当今装配式钢结构中、小桥中的最适用桥梁。由上弦杆、下弦杆、三角腹杆、横梁、桥面板以及连接件等构件拼装而成的下承式桥梁。构件之间的连接方式采用螺栓连接。桥面系可采用钢桥面板，也可采用混凝土桥面；桥梁两侧可额外的设计外置或内置人行道，超宽双车道可拓展至10米（若达到10米宽车道，横梁与桥面板需要加高加厚)。

ZY450型大跨度装配式公路钢桥是由上弦杆、下弦杆、三角腹杆、横梁、桥面板以及连接件等构件拼装而成的下承式桥梁。构件之间的连接方式采用螺栓连接。桥面系可采用钢桥面板，也可采用混凝土桥面；桥梁两侧可额外的设计外置或内置人行道。

The 450-type bridge is a large-scale prefabricated steel structure bridge that can be quickly assembled and formed under various natural conditions. It has strong load capacity and a span capacity of up to 80 meters. It is currently the most suitable bridge among medium and small bridges with prefabricated steel structures. A bottom-bearing bridge composed of upper chords, lower chords, triangular webs, beams, bridge decks, connectors and other components. The connection between components is bolted. The bridge deck system can use steel bridge decks or concrete bridge decks; additional external or built-in sidewalks can be designed on both sides of the bridge, and the ultra-wide dual lanes can be expanded to 10 meters (if the lane reaches 10 meters wide, the beams and bridge decks Needs to be taller and thicker).

The ZY450 long-span prefabricated highway steel bridge is a bottom-bearing bridge assembled from upper chords, lower chords, triangular webs, beams, bridge decks, connectors and other components. The connection between components is bolted. The bridge deck can be made of steel or concrete. Additional external or built-in sidewalks can be designed on both sides of the bridge.