Bidirectional grouting device provided with embedded grouting pipe and construction method

The invention discloses a bidirectional grouting device provided with an embedded grouting pipe and a construction method. The device comprises two parts including a combined grouting pipe and a pressurization device; the combined grouting pipe comprises at least two vertical grouting pipes and a plurality of horizontal grouting pipes which are connected between the two adjacent vertical groutingpipes and are perpendicular to the vertical grouting pipes; separating plates which are used for preventing the two adjacent vertical grouting pipes from communicating with each other are arranged inthe middles of the horizontal grouting pipes; through holes are formed in the horizontal grouting pipes and the vertical grouting pipes; spraying openings are arranged at the through holes and are provided with rubber sleeves which can coat the spraying openings completely; the bottoms of the vertical grouting pipes are sealed; the pressurization device comprises pistons matched with the verticalgrouting pipes; loading mec