Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring
Patent
1995-03-22
1996-07-23
Novosad, Stephen J.
Hydraulic and earth engineering
Underground passageway, e.g., tunnel
Boring
405144, E21D 908
Patent
active
055383629
ABSTRACT:
A shield excavator for constructing a tunnel, a hole, a groove and the like having a polygonal, preferably, square section. The excavator (10) comprises: a cylindrical shield body (12) having a polygonal sectional shape; a cutter assembly (18) disposed at a front end portion of the shield body (12) so as to be reciprocatingly movable in a first direction intersecting at least the axis of the shield body (12); and a driving mechanism (16) for driving the the cutter assembly (18). The cutter assembly (18) includes: a plurality of serrated cutters (66) disposed at the front end of the shield body (12) at intervals in a second direction intersecting the axis of the shield body (12) and the first direction and extending in the first direction, or a plurality of plate-shaped cutters (68) disposed at the front end of the shield body (12) at intervals in the first direction and extending in the second direction.
REFERENCES:
patent: 3711159 (1973-01-01), Mazzotti
patent: 4045088 (1977-08-01), Bechem
patent: 5163738 (1992-11-01), Linsingen-Heintzmann
patent: 5190407 (1993-03-01), Akesaka et al.
patent: 5211507 (1993-05-01), Siseki et al.
patent: 5340199 (1994-08-01), Piefenbrink et al.
International Search Report for International Application No. PCT/JP93/01455, dated Jan. 4, 1994.
International Preliminary Examination Report for International Application No. PCT/JP93/01455, dated Jul. 4, 1994.
Akesaka Toshio
Hamada Kazuto
Kabushiki Kaisha Iseki Kaihatsu Koki
Novosad Stephen J.
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