DIGGING TOOL, DIGGING BIT, AND DEVICE

摘要

A digging tool for taking the digging debris produced during digging operation efficiently into the inner circumferential side of a casing pipe and discharging the digging debris to the outside. In a digging tool (10) including a casing top (11), a casing pipe (15), a rod (60), a device (40), and a digging bit (20), a discharge groove (46) for discharging the digging debris is formed in the outer circumferential surface of the device (40), the digging bit (20) has a head portion (22) and a skirt portion (23), and the device (40) can be inserted into the inner circumference of the skirt portion (23). A face groove (27) opening to the forward end face and extending radially outward, a communication groove (28) continuous to the outer circumferential end of the face groove (27) and extending toward the rear end side, and an uptake hole (29) opening to the inner circumferential side of the skirt portion (23) from the communication groove (28) and communicating with the discharge groove (46) of the device (40) are formed in the head portion (22), and a shield wall (35) stretching radially outward greatly from the casing top (11) is formed at the rear end of the communication groove (28).