The techniques of topdown construction method for air shaft of metro line

Construction technology of the subway station by using the cover-excavation reverse method under the complex environment;

With some subway station foundation pit engineering as example,the construction planning and procedure of foundation pit excavation with open cut method were detail introduced.

The application of dual-purpose pile in topdown construction can not only save costs,but also make the mechanic condition of substructure walls more rational.

Deflection controlling measures and practices of deep foundation pits by use of top-down excavation method;