港珠澳大桥浅水区非通航孔桥组合梁设计

Design of Composite Girders for Non-Navigable Span Bridge of Hong Kong-Zhuhai-Macao Bridge in Shallow Water Area

港珠澳大桥主体工程采用桥隧组合方案,其中浅水区非通航孔桥采用85m连续组合梁桥形式,全长5 440m,共64孔,跨径布置主要采用6×85m和5×85m2种形式。组合梁采用单箱单室分幅等高连续梁,由开口钢箱梁和混凝土桥面板通过剪力钉联结而成。钢箱梁为倒梯形结构;混凝土桥面板为横向整块预制,在剪力钉处设置预留槽。为改善混凝土桥面板的横向受力性能,该桥组合梁截面设置小纵梁;为保持桥面板的整体性,剪力钉采用集束式布置方式。组合梁采用大型运架一体浮吊整孔安装架设,逐孔合龙。

The main part of the Hong Kong-Zhuhai-Macao Bridge is a part of the combined bridge and tunnel, of which the non-navigable span bridge in the shallow water area is the 85 m span continuous composite girder bridge that totally has 64 spans of the composite girders and is 5 440 m in length. The span arrangement of the bridge mainly includes two kinds of arrangement of 6×85 m and 5×85 m. The composite girders are the separated continuous single-cell single-box girders with constant depth and specifically are composed of the open steel box girders and the concrete deck slabs that are connected each other via shear studs. A steel box girder is the inverted trapezoid structure, a concrete deck slab is the precast full slab in the transverse direction and the grooves are pre-reserved at the locations of the shear studs. To improve the transverse mechanical behavior of the deck slabs, the stringers are set in the sections of the composite girders and to keep the integrity of the slabs, the shear studs are arranged in a way of clustering. The composite girders are erected and installed in each full span by the large transportation and erection floating crane and the girders are closed span by span.