Cutter structure for shield machine

Details Cutter structure for shield machine Cutter structure for shield machine

2005-07-12

2005-07-12

Walker, Zakiya (Department: 3672)

Boring or penetrating the earth

Processes

Boring horizontal bores

C299S060000

Reexamination Certificate

active

06915864

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.

REFERENCES:
patent: 4171848 (1979-10-01), Ono
patent: 5032039 (1991-07-01), Hagimoto et al.
patent: 5697676 (1997-12-01), Kashima et al.
patent: 6382732 (2002-05-01), Tanaka et al.
patent: 02-061291 (1990-03-01), None
Stack, B., “Handbook of Mining and Tunneling Machinery”, 1982, Wiley & Sons Publication, Ch. 11.

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