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十一、钢筋混凝土预制构件钢筋混凝土预制构件的类型较多,无论那种类型的预制构件,裂缝现象相当普遍。裂缝对于构件的防渗、钢筋防锈、混凝土防碳化(防中性化)等都起不利影响,应尽力加以控制。构件在制作和施工中出现的裂缝,称为“早期裂缝”;在车间投产后使用过程中出现的裂缝,称为“后期裂缝”。以下介绍几种主要构件的典型裂缝及初步分析意见。 1.预应力大型屋面板在屋盖结构中,大致可分为肋板结构和平板结构两种。其它还有少量的曲面壳板结
XI. Reinforced concrete prefabricated parts There are many types of reinforced concrete prefabricated parts. Regardless of the type of prefabricated parts, cracks are quite common. Cracks have an adverse effect on components such as seepage prevention, steel rust prevention, and concrete anti-carbonation (anti-neutralization), and should be controlled as much as possible. The cracks that occur in the production and construction of components are called “early cracks.” The cracks that occur during use in the workshop are called “late cracks.” The following describes the typical cracks and preliminary analysis of several major components. 1. Prestressed large roof panels In the roof structure, it can be roughly divided into two kinds of ribbed structure and flat structure. There are also a small number of curved shell knots