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在先张法预应力钢筋混凝土结构的施工中,预应力钢筋的放松是一个尚未完全解决的工艺课题。目前普遍采用的砂箱放松器存在一些问题:灌砂时劳动强度大,操作不便;砂子受潮后放砂困难,影响使用效果;更主要的是这种结构形式,对预应力梁、预应力板的预应力钢筋放松不能适应。 为此我们根据楔形原理于1976年设计制
In the pre-tensioned prestressed concrete structure construction, the relaxation of prestressed reinforcement is a not yet fully resolved technology issues. At present, there are some problems in sand box loaders commonly used, such as large labor intensity and inconvenient operation when filling sand, difficulty in putting sand when the sand is damp and affecting the use effect, and more importantly, this structure forms a prestressed concrete structure for prestressed beams, prestressed plates Prestressed reinforcement can not be relaxed. For this reason we designed according to wedge principle in 1976