在建的港珠澳大桥全长约50 km,其中主体工程"海中桥隧"长35.6 km,设计寿命为120 a,计划总工期为6 a,是中国建设史上里程最长、 投资最多、 施工难度最大的跨海桥梁项目.为了快速成桥及提高质量,该工程非通航孔桥的承台及桥墩采用一体化预制后水上安装工艺,深水区桥墩分两节/三节预制,墩身内部设有预应力滚压连续外螺纹粗钢筋,直径75 mm,屈服强度830 MPa,抗拉强度1030 MPa.所有粗钢筋安装及部分底节桥墩粗钢筋张拉在墩台预制场完成,水工现场进行剩余预应力粗钢筋的连接、 张拉、 压浆等施工.文中着重阐述了港珠澳大桥桥梁工程CB03标在墩台预制场安装及张拉预应力粗钢筋的一些技术工艺,对以后类似工程施工具有一定的参考价值.%The being built Hongkong-Zhuhai-Macao Bridge is about 50 km, and the major project of bridge and tunnel in the sea is 35.6 km, with a design life of 120 years and 6 years long construction period. This project has the longest mileage, largest investment and the biggest difficulty in construction in China construction history of sea-crossing bridge. In order to accelerate the progress and improve the quality, the technology of the integration of precast and aquatic installation is used in the pile caps and piers of the non-navigable bridges. Deep water pier is divided into two/three prefabrication, and prestressed rolling continuous external thread bars are settled in the pier, with a diameter of 75 mm, yield strength of 830 MPa, and tensile strength of 1030 MPa. All the installation of steel bar and part of the tensioning of the bottom section pier are completed in the pier precasting yard. The rest of the connection, tensioning, and grouting of the prestressed steel bar are conducted in the water conservancy project site. We emphatically expounded the technical process of the installation of CB03 in pier precast yard and tensioning prestressed steel bars in Hongkong-Zhuhai-Macao Bridge project , which has certain reference value to similar construction engineering projects.
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