Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring
Patent
1977-08-15
1979-02-13
Taylor, Dennis L.
Hydraulic and earth engineering
Underground passageway, e.g., tunnel
Boring
405132, E01G 300, E21D 904
Patent
active
041393201
ABSTRACT:
A process for excavating and constructing a tunnel, and an excavating device are disclosed. This process is directed to excavating and constructing a tunnel under a railway or a road on a bank or on level land in the direction transverse to the railway or road. In this process, pits are dug on the opposite sides of the railway, and then an excavator digs into the wall of a pit on one side so as to go out of the wall of the other pit through the ground left therebetween. In this respect, a hollow casing unit of a box shape is coupled to the rear end of the excavator equipped with a screw conveyor. As the excavator advances or digs forward a given distance, another casing unit is in turn coupled to the rear end of the preceding casing unit, and then such a step is repeated, until the excavator goes out of the wall of another pit. In this manner, the excavator further digs into the wall of one pit in the position adjacent to the preceding run of casing units. Then, these runs of casing units are placed around the imaginary contour of a tunnel, thereby forming the outer wall of the tunnel. The sand and soil inside the outer wall of the tunnel are excavated and removed, after which reinforcing steel bars and a mold are placed along the inner surface of the wall of the tunnel. Concrete is then poured into the hollow casing units themselves as well as between the mold and the wall. Thus, the hollow casing units form an integral part of the wall of a tunnel, as an outer wall.
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Itoh Isamu
Morita Yasuyuki
Ueno Toshiyuki
Ishikawajima-Harima Jukogyo Kabushi Kaisha
Japanese National Railways
Kyokuto Boeki Kaisha Ltd.
Taylor Dennis L.
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