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苏联西伯利亚某热电站的钢筋混凝土烟囱,高150米。经过12年使用后,发现有严重裂缝和变形,处于危险状态。裂缝是从烟囱底部起第一节上部的混凝土沿烟囱周围出现,裂缝长7.5米,宽400～700毫米,在深20～120毫米处竖向钢筋和水平钢筋外露。裂缝上部烟囱体下沉,竖向钢筋弯曲,弯曲长度25毫米。破损部分的混凝土强度很低,用锤子轻轻敲击便会散落。烟囱朝主厂房方向倾斜。在四个月内,倾斜度扩大到40%,达到350毫米。
The reinforced concrete chimney of a thermal power station in Siberia, 150 meters high. After 12 years of use, severe cracks and deformation were found and were in a dangerous state. The cracks were found from the chimney at the top of the first section of concrete around the chimney. The cracks were 7.5 meters long and 400 to 700 millimeters wide. The vertical steel bars and horizontal steel bars were exposed at depths of 20 to 120 millimeters. The chimney in the upper part of the crack sinks, and the vertical bar is bent. The bending length is 25 mm. The damaged part of the concrete is very low in strength, and it can be scattered by tapping it with a hammer. The chimney tilts toward the main building. In four months, the slope has increased to 40% to 350 mm.