dual head girder 双顶梁
Single-girder bridge by a single main beam and in the end beam span both sides of the composition, dual-beam bridge consists of two main beams and side beams formed.
单主梁桥架由单根主梁和位于跨度两边的端梁组成，双梁桥架由两根主梁和端梁组成。
Bridge's metal structure from the main beam and side beams, divided into single-and dual-beam bridge girder bridge types.
桥架的金属结构由主梁和端梁组成，分为单主梁桥架和双梁桥架两类。
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