Underwater excavation equipment and underwater excavation method

摘要

PROBLEM TO BE SOLVED: To provide an underwater drilling unit and an underwater drilling method capable of safely and surely drilling water bottom ground in a wide range even when the ground to be drilled is deep in water and the ground is solid.;SOLUTION: A barge 3 is positioned using a GPS 15, and the position of the barge 3 is fixed by connecting a mooring cable 27 to a fixing anchor 37. Then, a pipe casing 7 is extended underwater while being held by a pipe casing holding/driving device 5 installed to the barge 3, and a lower end 29 is penetrated to the water bottom 25. At the time, the position of the upper end vicinity of the pipe casing 7, an underwater extension length and an inclination are measured to recognize the position of the lower end 29 of the pipe casing 7. Then, the water bottom 25 is drilled by a shovel 9 while recognizing a drilled depth and the rugged state of the water bottom 25 from the posture of the shovel 9 measured using a sensor 19. Thereafter, the drilled soil is fetched from a soil fetching port 13 to the inside of the pipe casing 7 and is discharged to the outside using a crane 21 and a hammer grab 23.;COPYRIGHT: (C)2012,JPO&INPIT