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钢筋的混凝土保护层常用预制砂浆垫块保证其厚度,垫块内插入铁丝,在钢筋绑扎完后,再绑扎混凝土保护层垫块,然后立模,浇筑混凝土。这种方法比较麻烦,且浪费工时。在江苏省海安县新华河治理工程现场预制内径2.0 m、外径2.34 m 的钢筋混凝土涵管(钢筋内外保护层均为20 mm)施工中,我们采用了直径20 mm 的圆钢来实
The reinforced concrete protective layer is usually made of a prefabricated mortar pad to ensure its thickness. The iron wire is inserted into the pad. After the reinforcement is tied, the concrete protective pad is tied again, and then the form is poured and the concrete is poured. This method is cumbersome and wastes man hours. In the construction of reinforced concrete culverts with inner diameter of 2.0 m and outer diameter of 2.34 m in the Xinhua River treatment project of Hai’an County, Jiangsu Province (with both internal and external protective layers of steel being 20 mm), we used a round steel with a diameter of 20 mm.