Pipe structure for dewatering well to stretch into confined water layer and construction method

The invention provides a construction method for a dewatering well to stretch into a confined water layer. The method comprises the following steps that firstly, well hole drilling is conducted, well hole drilling is conducted at the set position according to design requirements, and a well hole sequentially penetrates an underground shallow water layer and a soil layer till stretching into the confined water layer; secondly, pipe lowering is conducted, the pipe structure for the dewatering well is lowered into the drilled hole, and it is guaranteed that the bottom end of a pipe stretches to the confined water layer; thirdly, filter material filling is conducted, the part between the pipe and the well hole wall is filled with clay, and the part between a filter pipe and the well hole wall is filled with a filter material to the designed height; fourthly, well washing is conducted; and fifthly, immersible pump sinking is conducted. In the construction method for the dewatering well to stretch into the confined