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白银公司冶炼厂炼铜炉１２０ｍ高尾气烟囱（连有长５０．９５ｍ的地下烟道），底标高为－５．２０ｍ，烟道截面如图１所示。建成后经３０年的使用，烟道内壁的瓷砖防腐层脱落，粘土砖缝进灰、鼓胀，部分墙拱掉块脱落，大片混凝土受腐蚀，主筋锈蚀变细或蚀断，严重危及安全...
The 120m high exhaust gas chimney of the copper smelting furnace of the Silver Company’s smelter (with an underground smoke tunnel with a length of 50.95m) has a base elevation of -5.20m. The flue section is shown in Figure 1. After being completed for 30 years, the ceramic tile anti-corrosion layer on the inner wall of the flue will fall off, the clay brick seam will enter into dust and bulge, some of the wall arch will fall off, the large piece of concrete will be corroded, and the main reinforcement will be rusted or eroded, seriously endangering the safety. .