Initially, it was found that there was a PC pile on the pipe jacking plan route, and it was difficult to remove it in advance, so the milling mole method was adopted.
An obstacle was confirmed by forward exploration during pipe jacking, and cutting was performed at a jack speed of 0.2 mm/ min. After cutting the two planned PC piles, two new obstacles were confirmed, and a total of four were cut, and the work was completed safely.