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予加应力钢筋混凝土中钢丝束所用铁皮管是用0.4公匣屋顶用的铁皮制成的。这种铁皮管系用若干个小的铁皮筒连接而成,因此在铁皮筒的接头处,须涂上浸沥青的材料或用浸沥青的隔离材料作成小条,将接头处缠绕,以免混凝土浆渗入管内。由于浇注混凝土时的振动和将有钢丝束的铁皮管往模型中安放时的工作,不可能保证接头处的完好,因而时常发生缝隙。为了克服这一缺点,奥利菲尔工程师建议采用亚硫酸盐纸浆废液代替铁皮管,其操作
Steel bars for prestressed reinforced concrete wires are made of tin with a 0.4-mm roof. This type of iron pipe with a number of small iron tube connected, so in the metal tube joints, to be coated with bitumen impregnated material or made of asphalt impregnated strips, the joints at the winding, so as to avoid the concrete slurry Infiltration into the tube. Due to the vibration of the concrete pouring and the steel pipe will be placed in the model of the metal tube when the work, it is impossible to ensure the integrity of the joints, and therefore frequent cracks. In order to overcome this shortcoming, Olivier engineers proposed the use of sulphite pulp waste instead of a tin tube, the operation of which