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, an...