Cutter structure for shield machine
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United States of America Patent
Stats
-
Jul 12, 2005
Grant Date -
May 22, 2003
app pub date -
Aug 22, 2002
filing date -
Nov 21, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a cutter structure for a shield machine which advances by boring through a tunnel wall from inside an existing tunnel, the shape of an excavating surface on a work face formed by a cutter is set so as to have a smaller curvature than or an equal curvature to the curve of a surface to be excavated on the outer face of the tunnel wall to be excavated. Since the shape of the excavating surface on the work face formed by the cutter is set by a curvature, upon advance of the shield machine by boring through the tunnel wall, the tunnel wall to be excavated, the shape of which is cylindrical, can be cut into by opening a hole which extends diametrically outward from the central portion of the cutter. As a result, the sections that are not cut into remain connected to the existing tunnel and will not enter the cutter chamber in lumps.
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