摘要
在宁波轨道交通1号线一期工程V标樱花公园站施工中,通过对深基坑真空降水的研究,设计出一种双管疏干井结构,该结构是在传统的真空降水单井管基础上增加内管,形成内外腔结构。内腔顶部开放,外腔密封持续保持高真空状态,使低渗透性黏土地层与外腔形成压力差,加速土层中的水向外腔渗透,大大提高了深基坑降水的效率,取得了良好的降水效果,具有一定的推广价值。
During the construction in the first stage V section of Ningbo Rail Transit Line 1 Sakura Park Station, the structure of double-pipe drainage well has been designed based on the research of vacuum dewatering of deep foundation pit. In the new structure, an inner pipe shall be added to the original vacuum dewatering well so as to form an inner and outer cavity structure. The inner cavity top shall be open, while the outer one shall be sealed in high vacuum state. As a result, there is a pressure difference between the low permeability clay layer and the outer cavity, which will accelerate the water permeation to the outside. This technology has greatly improved the dewatering efficiency of the deep foundation pit and has achieved good dewatering results, which has a certain promotion value.
出处
《建筑施工》
2015年第4期422-423,470,共3页
Building Construction
关键词
低渗透性黏土层
超真空降水
双管疏干井
内外空腔结构
low permeability clay layer
UHV dewatering
double-pipe drainage well
inner-outer cavity structure
