| 摘要 |
PROBLEM TO BE SOLVED: To provide a drilling rod by which a heat exchange tube for utilization of underground heat can be easily buried, and a time and labor for discharging sludge generated by drilling to the ground surface and handling the sludge is reduced.SOLUTION: A drilling rod 1 includes a shaft 10 and a head 20 attached to a lower end of the shaft. The head 20 has: a head body 21 which is a cylindrical body with an insertion hole 5 formed; a blowout part 22 for blowing out drilling water; a bottom cover 25 for closing the insertion hole 5; a rammer 24 for ramming the bottom cover 25 to make it withdraw from the head body 21; and a rammer operation part 23 for pushing out the rammer 24 toward the bottom cover 25. The shaft 10 has: a shaft body which is a cylindrical body with the insertion hole 5 formed; a drilling water pipe 12 for supplying drilling water to the blowout part 22; and a cover removing rod 15 extending along the axial direction from an upper end side of the shaft body, and making the rammer operation part 23 move slidingly. |
