STEP PROCESSING METHOD FOR DRILLING HOLE

PROBLEM TO BE SOLVED: To provide a step processing method for drilling hole that can solve a problem in which a conventional step processing method for drilling hole requires a bucket for drilling dedicated to a diameter expansion part and is thereby high in manufacture cost and construction cost an...

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Bibliographische Detailangaben
Hauptverfasser:	ARAI TOSHIAKI, YAJIMA JUNJI, NAKAZAWA FUTA, MIYATA KATSUTOSHI, TAKAHASHI KOJI, TAGUCHI TOMOYA, SANO DAISAKU, OGAWA ATSUSHI, HATTORI KEISHO, IIDA TSUTOMU, ENOMOTO TAKESHI, KAWANISHI YUKI, MORI TAKESHI, FUJIKI HIDENORI, MATSUKI KAZUHIKO, KOBAYASHI KOJI, YAMADA MASAKI, MIYAMOTO KAZUYUKI
Format:	Patent
Sprache:	eng
Schlagworte:	EMBANKMENTS EXCAVATIONS FIXED CONSTRUCTIONS FOUNDATIONS HYDRAULIC ENGINEERING SOIL SHIFTING UNDERGROUND OR UNDERWATER STRUCTURES
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a step processing method for drilling hole that can solve a problem in which a conventional step processing method for drilling hole requires a bucket for drilling dedicated to a diameter expansion part and is thereby high in manufacture cost and construction cost and long in construction period.SOLUTION: A step processing device 1 for drilling hole is constituted which comprises: a rod suspended from a kelly-bar; a bucket for drilling provided at a lower end part of the rod; an expansion blade which is provided on the rod, and swings to be made compact within a diameter range of the bucket for drilling when stored, and projects and swings from the diameter range of the bucket for drilling when expanded to obliquely drill a step part of a hole wall through rotation of the kelly-bar; and a swing driving device provided on the rod so as to make the expansion blade swing. In a step processing device for drilling hole, the step processing device for drilling device 1 drills a step part formed in a drilling hole in a tapered shape with the enlargement blade 5.