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在钢筋混凝土结构中,为了保护钢筋不受大气腐蚀,并与混凝土有足够的握裹力,在外层钢筋与构件表面间必须有一定的保护层。过去往往用砂浆垫块控制保护层厚度。在垂直构件(如柱子、墙体)中钢筋外侧的砂浆垫块,往往因为没有绑牢或支模、浇灌、振捣混凝土时被碰动、撞坏,因而失去作用。采用大型钢模的混凝土板墙,施工时砂浆垫块更容易被碰坏。而且,砂浆垫块不能固定和保证双排钢筋之间的距离。为保证墙板钢筋的正确位
In the reinforced concrete structure, in order to protect the steel bar from atmospheric corrosion and have sufficient gripping force with the concrete, a certain protective layer must be provided between the outer steel bar and the surface of the component. In the past, mortar pads were often used to control the thickness of the protective layer. In the vertical members (such as columns and walls), the mortar pads on the outside of the steel bars often lose their effect because they are not tied or mold-supported, watered, vibrated, and damaged. With a large steel mold concrete wall, mortar pads are more likely to be damaged during construction. Moreover, the mortar pad cannot fix and guarantee the distance between the two rows of steel bars. To ensure the correct position of the wall bars