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预应力混凝土(以下称PC)技术于1950年即开始实际应用,并以桥梁结构物为中心进行推广。PC结构物按控制裂进行设计,并采用了高强混凝土,一般均具有高耐久性。另一方面它对环境的变化与过大荷载具有一种敏感特性,因而也出现了一些有关因PC钢筋腐蚀,甚至引起结构物崩塌的事例。为此,如要长期保持所需性能,就应进行恰当的维修管理。随着PC结构物长期使用,日趋高龄化,维修管理的重要性越来越高。有鉴于此,本文特以PC结构物维修管理中的探测诊断技术最新动向为主要内容概述如下。
The prestressed concrete (hereinafter referred to as PC) technology was put into practical use in 1950, and it was promoted with the bridge structure as the center. The PC structure is designed for controlled cracking and uses high-strength concrete, which generally has high durability. On the other hand, it has a sensitive characteristic of changes in the environment and over-loading, and there have also been some cases of corrosion due to PC rebar and even structural collapse. For this reason, proper maintenance management should be performed if the required performance is to be maintained for a long period of time. With the long-term use of PC structures and their ageing, the importance of maintenance management is increasing. In view of this, the main contents of the detection and diagnosis technology in the maintenance management of PC structures are summarized as follows.