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预应力大型屋面板是工业厂房屋盖系统的重要组成部分。在实际施工生产中,屋面板端头开裂现象较为严重。经过多次现场观察,发现屋面板端头裂缝的形式有以下三种:(1)端头横肋竖向开裂;(2)支座部分内外八字形裂缝;(3)支座处沿预应力主筋方向纵向开裂。我们针对裂缝产生原因,在施工中采取了两种控制方法。一、对钢筋放张时,因混凝土强度不足
Prestressed large roof panels are an important part of the industrial plant house cover system. In the actual construction and production, cracking of the roof plate is more serious. After several on-site observations, it was found that there were three forms of cracks in the end of the roof slab: (1) vertical cracks in the transverse ribs of the end; (2) cracks in the inside and outside of the support; and (3) prestressing along the support Longitudinal cracking of the main tendons. We have adopted two control methods for the construction of cracks. First, due to the lack of concrete strength when reinforcing steel bars