CONSTRUCTION OF SHAFT

CONSTRUCTION OF SHAFT

PURPOSE:To make shaft sinking executable so safely by solving problems on the shortening of a construction period necessary for a high depth shaft, the promotion of cost down, the countermeasure of high hydraulic pressure and so on. CONSTITUTION:A slot 18 is formed in the ground by a reverse circula...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: NUMA KUNIO, YASUMOTO MASATAKE, OKUMURA TOSHIHIRO
Format: Patent
Sprache:eng
Schlagworte:
EARTH DRILLING
FIXED CONSTRUCTIONS
GALLERIES
LARGE UNDERGROUND CHAMBERS
MINING
SHAFTS
TUNNELS
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Beschreibung
Zusammenfassung:PURPOSE:To make shaft sinking executable so safely by solving problems on the shortening of a construction period necessary for a high depth shaft, the promotion of cost down, the countermeasure of high hydraulic pressure and so on. CONSTITUTION:A slot 18 is formed in the ground by a reverse circulation drill 16 equipped with a reamer bit 32. Next, an expanded slot part 34 is formed at a tip part of this slot 18 with the reamer bit 32 of the reverse circulation drill 16. In addition a cylindrical watertight structure 40 is installed in the slot 18. Next, a clearance between a hole wall of the slot and an outer circumference of this watertight structure is solidified. With this constitution, a bottom part of the watertight structure 40 is set down to a starting pit mouth 46 for a shield machine 48.