钢混结合梁梁板起顶结合技术

武汉二七长江大桥非通航孔采用6×90m钢混结合梁，开口钢槽梁与预制桥面板通过剪力钉结合。在梁板结合施工中，采用了起顶、结合、落梁的施工工艺，使桥面板结合后储备一定的压应力，降低了二期恒载及其他荷载在墩顶区产生的顶板拉应力，充分利用钢材抗拉和混凝土抗压性能，减少顶板开裂，提高结构的耐久性和安全性。

Deck-Beam Precambering and Integrating Technology in Steel-Concrete Composite Girder

The non-navigation span of Wuhan Erqi Bridge has a 6×90 m steel-concrete composite girder, the open steel channel beam and the precast deck are combined through the shear nails on the top of the beam. Through cambering, integra- tion and falling in place, compressive stress is stored in the deck, so the tensile stress in the deck around the pier is reduced caused by later dead load. The tensile properties of steel and the compression performance concrete are used fully, so the deck cracking is reduced and the structural durability and safety are improved.