轨道交通建设使用地面以下的空间，不受其上方土地使用权的限制。
The CRC construction that USES the underground space is not subject to the restriction of the use rights of the land above.
上部结构是建筑物地面以上的部分，而下部结构和基础则是建筑地面以下的部分。
The superstructure is that part of a building above ground, and the substructure and foundation is that part of a building below ground.
本文全面论证了粉煤灰砖的强度稳定性。认为粉煤灰砖可用于干湿冻融部位，宜用于地面以下的一般工程。
This paper expound overall the stability of strength about pfa brick, which indicates that pfa brick can be used for the position of freezing and thawing and for the general under ground engineering.
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