最近,八冶某工地施工了六个粉矿仓。粉矿仓是直径12米,高12.43米的钢筋混凝土圆罐。仓壁厚度270毫米。壁内配有直径10毫米、间距200毫米的立筋和直径12毫米、同距150毫米的水平环筋,设计要求仓壁内侧保护层为50毫米。以往在施工类似的钢筋混凝土构物时,一般采用相应厚度的混凝土垫块或短钢筋头垫起主筋来控制保护层。当浇捣混凝 Recently, six powder silos were constructed at a site at Bayi Metals. The powder ore bin is a reinforced concrete round can with a diameter of 12 meters and a height of 12.43 meters. Wall thickness 270 mm. The wall is equipped with vertical bars with a diameter of 10 mm and spacing of 200 mm and horizontal ring bars with a diameter of 12 mm and a distance of 150 mm. The design requires that the protective layer inside the wall be 50 mm. In the past, when constructing a similar reinforced concrete structure, a concrete bolster with a corresponding thickness or a short steel reinforcing pad was used to control the protective layer. When poured into concrete