Carrying out manner null of recovery of caisson drilling machine and excavation

摘要

PURPOSE:To discharge an excavator from the same shaft by storing a boom moved to a disconnecting rail and set in vertical position in a storing container after its hatch is closed and its pressure is returned back to the atmosphere, in recovering, and opening the hatch to discharge the boom from a work room to the outside, in discharging. CONSTITUTION:When a caison excavator C is recovered, the caison excavator capable of moving freely along a rail T provided on a roof of a work room B is moved to the disconnecting rail 7 just below a lower hatch container 1. Also a boom 9 in vertical position relative to the ground as well as the disconnecting rail 7 are pulled up into a storing container 3 after its lower hatch 2 is closed and the pressure inside it is returned back to the atmosphere. After the caison excavator C is discharged, the lower hatch 2 is opened and excavated sediment is discharged from the work room B to the outside through hatch 2, storing container 3, material shaft 5, and material lock 6. Thus the excavator can be recovered under the atmosphere for inspection and repair.