Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring
Patent
1990-11-05
1991-07-16
Taylor, Dennis L.
Hydraulic and earth engineering
Underground passageway, e.g., tunnel
Boring
405138, 175189, 299 55, 299 62, E21D 906
Patent
active
050320394
ABSTRACT:
An underground excavator includes a chamber defined in the forward section of an excavator body for receiving excavated material such as soil, sand, gravel, clay and their mixtures. A rotary cutter is mounted to the forward end of a rotary shaft for penetrating through the chamber for axial rotation and simultaneous rocking in an axial direction. The cutter has a conical cutter face plate having holes for passing the excavated material of a diameter smaller than an opening disposed in the chamber. Any gravel or the like present in the advancing route to the underground excavator and smaller than the holes of the cutter is received into the chamber to be discharged from the excavator. Any gravel larger than the holes or the like not receivable into the chamber is moved quickly along the conical cutter face plate toward peripheral ground layer by being subjected to the rocking motion of the conical cutter face plate simultaneously with the rotation of the cutter during advancement of the excavator. Facilities and labor formerly required for removing larger gravel or like materials can be omitted to remarkably reduce excavation costs.
REFERENCES:
patent: 3235014 (1966-02-01), Brooks
patent: 4165129 (1979-08-01), Sugimoto et al.
patent: 4167289 (1979-09-01), Ono et al.
patent: 4624605 (1986-11-01), Akesaka
patent: 4674913 (1987-06-01), Matsuda
Hagimoto Hakumi
Honma Kiichi
Kashima Yutaka
Kondo Norio
Tomisawa Tsutomu
Daiho Construction Co., Ltd.
Ricci John
Taylor Dennis L.
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