A DISPLACEMENT BORED PILE METHOD WITH IMPERMEABLE AND DETACHABLE CASING SHOE

摘要

The present invention relates to a casing structure for on-site pile installation having a water impermeable function. According to an embodiment of the present invention, the casing structure for on-site pile installation comprises: a casing rotated in one direction and inserted into the ground to maintain a hollow wall when boring a hole in the ground; and a front end shoe installed on the front end of the casing to block an inflow of underground water and soil into the casing. The casing structure for on-site pile installation further comprises: at least one front end key of a bar shape formed on at least a portion of a front end of an outer wall of the casing; and at least one rotational key which is formed on at least a portion of an outer circumference of the front end shoe and protrudes to the outside of the front end shoe. The lower end of the front end key is extended downwards more than the front end of the casing. A stopping protrusion is formed only one side of the rotational key to stop the front end key on the rotational key to rotate the front end shoe in the one direction when the casing rotates in the one direction, and allow the front end key to escape from the rotational key to draw the casing only from the ground when the casing rotates in the other direction.