As one of the exterior building enclosures, the roof fulfils key functions in energy-saing building. 摘要屋顶作为建筑物外围护结构之一，在建筑节能方面具有重要作用。
Diaphragm walls are commonly used as retaining structures in many deep foundation pits, especially when the environment protection is severer. 摘要地下连续墙刚度大，变形小，作为基坑开挖阶段的围护结构可有效的保护周边环境。
