METHOD AND DEVICE FOR BORING SHAFT OF LARGE DIAMETER

• Main Authors: SASAKI KIYOMI, MIZUTA SADACHIKA
• Format: Patent
• Language: English
• Published: 10.08.1993
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; EMBANKMENTS; EXCAVATIONS; FIXED CONSTRUCTIONS; FOUNDATIONS; HYDRAULIC ENGINEERING; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; SOIL SHIFTING; UNDERGROUND OR UNDERWATER STRUCTURES

PURPOSE:To enable proximity execution, facilitate handling, and easily deal with variation of the bore diameter of a casing tube. CONSTITUTION:A cylindrical adapter 4 is fitted to the upper end part of a large bore diameter casing tube 2, the adapter 4 is gripped with an adapter holding device 5, and the large bore diameter casing tube 2 is pressed in the earth while rotating by operating rotational drive devices 8, 7 and an elevatable drive device 6. Further, earth and sand in the casing tube are drilled and discharged by means of a drilling tool 9 such as a hammer grab. At finishing drilling by the length of unit casing tube, the cylindrical adapter 4 is removed from the upper end part of the large bore diameter casing tube 2, lifted by means of the elevatable drive device 6, horizontally moved by means of a horizontally moving device 12, and a new large bore casing is added to the upper end part. Next, the cylindrical adapter is returned to the initial position, fitted to the upper end part of another large bore diameter casing by means of the elevatable drive device 6, and drilling is continued.