TIP CAP OF CASING FOR GROUND EXCAVATION, AND CASING FOR GROUND EXCAVATION WITH TIP CAP

PROBLEM TO BE SOLVED: To provide a tip cap for a casing for ground excavation which can be certainly and easily attached and detached to the casing, and the casing for ground excavation with the tip cap.SOLUTION: Sediment of the ground is prevented from getting into the inside of a casing 2 in ground excavation by sealing the tip opening of the casing 2 by a body part 8 constituting a tip cap 7. An engaging part 9 which can be stored inside the outer peripheral surface of the body part 8 is engaged into an engaging hole 3 formed in the casing 2 to fix the tip cap 7 to the inside of the tip of the casing 2 by projecting the engaging part 9 outside the outer peripheral surface of the body part 8. The engaging part 9 is moved inside the outer peripheral surface of the body part 8 to be stored only by pressing a pressing shaft 10a of a pressing part 10 with an outer tube 13 inserted into the casing 2, and fixation of the tip cap 7 fixed to the inside of the tip of the casing 2 is released.