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由我单位承建的石家庄职业技术学院锅炉房工程,砖烟囱高40m,其顶部环境恶劣,避雷针易受化学物质侵蚀。如按照通常作法,采用镀锌圆钢或镀锌钢管做避雷针,一两年后,针尖部位易生锈,使导电性能降低。对此,我们采取了改进作法:针尖采用(?)32圆柱,长200mm,一端磨尖,然后作
The boiler house project of Shijiazhuang Vocational and Technical College constructed by our company, the brick chimney is 40 meters high, and its top environment is harsh, and the lightning rod is vulnerable to chemical substances. According to the usual practice, galvanized round steel or galvanized steel pipe is used as a lightning rod. After one or two years, the needle tip is liable to rust and the electrical conductivity is reduced. In this regard, we have adopted an improvement method: a 32-point (?) cylinder with a 200-mm-long needle tip and a sharpened tip