Water-rich sand gravel soil layer pile foundation pile casing grouting reinforcement construction method

The invention discloses a water-rich sand gravel soil layer pile foundation pile casing grouting reinforcement construction method. The water-rich sand gravel soil layer pile foundation pile casing grouting reinforcement construction method comprises the steps that (1) the embedding depth of a steel casing is determined according to the thickness of a sand gravel soil layer and the height of a water head; (2) the steel casing is embedded, backfilling and tamping are conducted according to the designed elevation of a backfilling layer; (3) grouting pipes are driven into the periphery of the steel casing, and grouting is conducted according to pressure to form a grouting body surrounding the steel casing; and (4) after the grouting body reaches the consolidation strength, drilling operation is conducted through a drilling machine. According to the water-rich sand gravel soil layer pile foundation pile casing grouting reinforcement construction method, the water-rich sand gravel soil layer around the steel casin