1.前言 预应力混凝土下承式桥梁的施工,一般都在脚手架上灌筑混凝土。但在城市内建桥时,设置脚手架常有困难,每每需要在施工方法上采取特殊手段。 跨度44m的子安跨线桥,建于日本横滨货物专用线上。位置如图1(从略)。由于与工 1. Introduction Prestressed concrete under-bridge construction, are generally in the scaffolding of concrete. However, it is often difficult to set up scaffolding when building bridges in the city, and often require special measures on the construction method. Spanning the span of 44m Zi-An, built in Japan Yokohama dedicated cargo line. Location as shown in Figure 1 (omitted). Thanks to workers