在软土地基上建造的高层建筑，有时因地下围护结构的失稳或基坑挖土方法的不当造成基础群桩发生严重位移的工程事故。
The underground pit wall structure unstability or foundation pit excavations accident will cause multi -pile(group- pile) serious movements when high- rise building built on soft ground.
近年来大量工程事故统计资料表明，混凝土结构在施工阶段的安全性已成为突出问题。
It is shown that the safety for concrete structures in the construction had become the key problem from the recent some engineering accidents.
在混凝土灌注施工中，钢管拱的结构刚度随着加载施工不断变化，稍有不慎就可能引发工程事故。
Meanwhile, during the process of filling concrete, the stiffness of steel pipe will change according to the quantity of concrete, and any carelessness may result in accident.
大量工程实践证明，温度应力、冰膨胀力是引起大体积混凝土渡槽结构出现裂缝和发生事故的主要原因。
A large number of project experience have shown that thermal stress and ice expansive pressure are the primary factors which cause mass concrete aqueduct to crack and wreck.
西安电视塔的装修改造，要求在塔楼、塔座增设部分钢梁、钢柱，而工程结构由于使用不当或任意改建引起的事故经常发生。
When reconstructing Xi an TV tower, steel beams and columns will be added at the top and base of the tower.
西安电视塔的装修改造，要求在塔楼、塔座增设部分钢梁、钢柱，而工程结构由于使用不当或任意改建引起的事故经常发生。
When reconstructing Xi an TV tower, steel beams and columns will be added at the top and base of the tower.
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