Construction method and system for asymmetric cantilever beams of cable-stayed bridge: Fid-Bau Portal

Construction method and system for asymmetric cantilever beams of cable-stayed bridge

WEN DONGCHANG / WU JIAN / YUAN FENG / SHEN QIAN / YANG SHILIN

The invention relates to a construction method and system for an asymmetric cantilever beam of a cable-stayed bridge. The construction method for the asymmetric cantilever beam of the cable-stayed bridge comprises the steps that a middle span 1 # block and a side span 1 # block are erected respectively; a deck crane is installed on the mid-span 1 # block, and a guy rope hanging basket is installed on the side-span 1 # block; the auxiliary pier closest to the cable bent tower is configured to be a balance weight type tension and compression auxiliary pier; and when the side span main beam extends to the balance weight type tension and compression auxiliary pier, the side span main beam is fixedly connected with the balance weight type tension and compression auxiliary pier. After the first block of the side span and the middle span is installed, the guy cable hanging basket is installed on the side span side, and the deck crane is installed on the middle span side, so that each section of the side span main beam and the middle span main beam can be constructed at the same time, stay cables can also be installed at the same time, and it is guaranteed that the stress of the stay cables on the corresponding sections is the same; therefore, the stability and the linetype of the bridge in and after the construction process of the cable-stayed bridge are ensured.

本发明涉及一种斜拉桥不对称悬臂梁的施工方法及系统，斜拉桥不对称悬臂梁的施工方法包括：分别架设中跨1#块和边跨1#块；在所述中跨1#块上安装桥面吊机，所述边跨1#块上安装牵索挂篮；最靠近索塔的辅助墩配置为配重式拉压辅助墩；边跨主梁延长至所述配重式拉压辅助墩时，将所述边跨主梁与配重式拉压辅助墩固结连接。在边跨和中跨的1#块安装完成之后，则在边跨侧安装牵索挂篮，中跨侧安装桥面吊机，进而使得边跨主梁和中跨主梁每一节块都能够同时施工且斜拉索也能同时安装，保证了相对应节块上斜拉索的应力相同，以保证斜拉桥施工过程中和之后桥梁的稳定性和线型。

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