铜绿山矿某三铰拱屋架单轨吊梁结构体系，因技术改造增加设备简体重量，随意用滑轮组起吊检修，导致拱架上弦全截面贯通式开裂的结构事故。
Then the structural accident of total section drive-through type crack is caused in arch frame top chord, which is induced by hoisting and detection using pulley arbitrarily.
本文针对实际工程中钢筋混凝土梁出现贯通垂直裂缝的原因进行了分析。
The reasons for creating vertical joint crack on the reinforced concrete beam used in practical projects are analysed in this paper.
研究方法：以南梁-太行山隧道洞外精密控制测量复测为例，通过比较分析同名基线的距离和方位角，考察两次结果对隧道贯通误差的影响。
The discussions are made in this paper on implement of repetition survey and the comparison of corresponding baselines with original baseline in the data processing.
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