WATER AND AIR INJECTION PIPE, AND METHOD FOR PURIFICATION OF CONTAMINATED SOIL USING THE SAME

摘要

PURPOSE: An injection pipe which efficiently purifies contaminated soil by injecting water and air in a high pressure, replaces the soil by injecting a replacement material into contaminated soil discharged space part, and a method for purifying the contaminated soil using the same are provided. CONSTITUTION: The injection pipe(2) comprises an injection part(5) which is installed at the front end of a triple pipe(4) for separately supplying water(30), air(31) and a replacement material in the slurry state respectively; a high pressure water nozzle(10) for injecting water in a high pressure and an air nozzle(11) for ejecting air in a high pressure which are adjacently installed to the side surface of the injection part; a replacement material nozzle(13) for injecting the replacement material in the slurry state which is installed at the front end part of the lower side of the high pressure water nozzle and the air nozzle; and a plural drilling bits(14) which are projectingly installed at the front end part of the replacement material nozzle. The method for purifying contaminated soil comprises the processes of inserting the injection pipe into the earth until it reaches contaminated soil bed by drilling the earth using drilling bits as rotating the injection pipe; agitating the contaminated soil by injecting water and air from injection nozzles as rotating and pulling up the injection pipe; and discharging the contaminated soil in the slurry state(32A) from a space between a hole(27) and the injection pipe onto the ground, and injecting the replacement material in the slurry state from a replacement material injection nozzle installed under the injection nozzles for water and air so that the replacement material in the slurry state is laid under the ground in a space part of the discharged contaminated soil.