摘要
The Awa Shirasagi Ohashi Bridge is located at the tidal estuary of the River Yoshino in Japan, adjacent to wetlands where migratory birds such as snipe and plover congregate. As the wetlands form a unique and invaluable ecosystem, an environmental conservation group expressed serious concerns over the construction of the bridge. A long-span bridge with low visual intrusiveness to avoid any negative impacts on the ecosystem associated with the wetland was required. To satisfy the requirements, a unique type of cable trussed system termed a ‘cable egret’ structure was designed. The proposed structural form enabled a 260 m long span with pylons only extending 29·6 m above the deck and a minimum number of cables, minimising impacts on the ecosystem associated with the wetland. In the span between the two pylons, the main girders made composite with the sandwich slabs are propped by intermediate under-slung supports, which are in turn suspended by a cable truss system. This paper describes details of the cable egret system and the construction method adopted for the bridge, which allowed the environmental impact to be minimised.
摘要译文
Awa Shirasagi Ohashi Bridge位于日本吉野河的潮汐河口，毗邻湿地，如鹬和p鸟等候鸟。由于湿地形成了一个独特而宝贵的生态系统，环境保护组织对桥梁建设表示严重关切。需要一种具有低视觉侵入性的大跨度桥梁，以避免对与湿地相关的生态系统产生任何负面影响。为了满足要求，设计了一种独特类型的电缆桁架系统，称为“电缆白鹭”结构。拟议的结构形式使得长度为260米，塔架仅在甲板上方29.6米处延伸，并且线缆数量最少，从而最大限度地减少了与湿地相关的生态系统的影响。在两个塔架之间的跨度中，与夹层板复合的主梁由中间下悬式支撑件支撑，中间下悬式支撑件又由缆索桁架系统悬挂。本文介绍了电缆白鹭系统的细节和桥梁采用的施工方法，使环境影响最小化。
Shuichi Takeichi[1];Kazumi Terada[2];Daisuke Saito[3]. Low-impact cable system adopted for the Awa Shirasagi Ohashi Bridge, Japan[J]. Proceedings of the Institution of Civil Engineers. Bridge Engineering, 2018,171(2): 106-117