Shielding apparatus for high-depth groundwater well pollution prevention grouting

A shielding apparatus for high-depth groundwater well pollution prevention grouting, the shielding apparatus comprising:

• a shielding portion which is provided on the outer circumferential surface of a grouting casing installed in an excavation hole in the ground and compressed to be in close contact with a hollow wall of the excavation hole;
• a compression portion which is provided on the outer circumferential surface of the grouting casing and formed to descend toward the shielding portion to compress the shielding portion into close contact with the hollow wall of the excavation hole to guide the excavation hole to be sealed, wherein the compression portion includes a plurality of cylinders;
• a pressure equalization injection tube portion which is connected with the compression portion on the outer circumferential surface of the grouting casing and lowers the compression portion by water pressure generated by water through a water supply tube;
• and
• a pressing plate which is provided on the outer circumferential surface of the grouting casing so as to face an upper surface of the shielding portion and has a plurality of engaging grooves formed along an edge of the pressing plate to receive the plurality of cylinders.