Application of light well point precipitation in engineering;

In Zhengzhou Zhongfu square construction,the foundation pit is dewatered by light well point and tubular well together and supported by soil nail wall and concrete-drilling pile;the construction result proves to be effective.

In the light of the Project practice the paper introduces the arrangement method of the light well point of sandy soil foundation.

The article systematically summarizes the ways of downgrading ground water with the use of light well points during construction of the basement according to the experience of the national defense project.

Penetration point treatment in light well dewatering;

The dewatering scheme is vacuum well combining light well and blind drainage.

In this paper, through practice and observation and model test for light well point drainage project, several problems such as clay refilling and slop of total pipe required in standards are analyzed.

Many practical difficulties were solved by the patent technique for ultra-light well site dewatering in these years,which was applied in a foundation pit engineering to remedy insufficient dewatering of tube well.