TUNNELING MACHINE

PROBLEM TO BE SOLVED: To provide a cutter for sensing an obstruction which can be easily mounted without changing the shape of a conventional tunneling machine and can precisely grasp the presence and the shape of an obstruction and can also prevent beforehand damage to an earth-sand cutting cutter....

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Bibliographic Details
Main Authors BANDO EIGO, MITANI NORIO
Format Patent
LanguageEnglish
Published 06.04.1999
Edition6
Subjects
DETECTING MASSES OR OBJECTS
EARTH DRILLING
FIXED CONSTRUCTIONS
GALLERIES
GEOPHYSICS
GRAVITATIONAL MEASUREMENTS
LARGE UNDERGROUND CHAMBERS
MEASURING
MINING
PHYSICS
SHAFTS
TESTING
TUNNELS
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Summary:PROBLEM TO BE SOLVED: To provide a cutter for sensing an obstruction which can be easily mounted without changing the shape of a conventional tunneling machine and can precisely grasp the presence and the shape of an obstruction and can also prevent beforehand damage to an earth-sand cutting cutter. SOLUTION: Cutter bits 6 and a plurality of obstruction sensing cutters 8 extending forward of preceding cutters 7 are provided on the front side of a cutter head and a strain gauge is provided in the cutter head. When the cutters 8 contact an obstruction, the gauge captures the force generated at the contact as a variation in external loads and a signal of the variation is inputted into a control device. The control device judges whether the variation in external loads is caused by a gravel or by an obstruction such as a pile and grasps the shape and location of the obstruction.
Bibliography:Application Number: JP19970256488