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一、前言日本把预应力混凝土技术应用于桥梁,是1952年竣工的长生桥(位于石川县七尾市),这是倒T形填充式先张法的结合桥面板桥梁,桥长为三跨11.6米(有效宽度6米)。最初的预应力混凝土桥大多采用先张法,也采用后张法,但跨度只到20米左右。尔后,随着预应力混凝土技术的惊人的发展,结构型式的合理化、架设方法的机械化、预应力混凝土钢材和混凝土高强度化等相结合,墩中心间距加大的记录年年被刷新。例如以日本的例子来看,公路桥在1962年最初完成的桥跨度就超过了100米(宫崎
Foreword Japan applied prestressed concrete technology to the bridge, which was completed in 1952. Changsheng Bridge (located in Qiwei City, Ishikawa Prefecture) is a combined bridge deck bridge with inverted T-shaped prefabricated bridge with a length of three span 11.6 M (effective width of 6 meters). Most of the initial prestressed concrete bridge first method, also used post-tension method, but only about 20 meters span. Later, with the phenomenal development of prestressed concrete technology, the rationalization of structural forms, the mechanization of erection methods, the combination of prestressed concrete and concrete, the record of increased spacing between piers was refreshed every year. For example, in the Japanese example, the span of a bridge originally completed by the Highway Bridge in 1962 exceeded 100 meters (Miyazaki