Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Vertical
Patent
1979-12-27
1981-06-02
Friedman, Carl D.
Hydraulic and earth engineering
Underground passageway, e.g., tunnel
Vertical
405142, 405146, 425 59, E21D 900
Patent
active
042708761
ABSTRACT:
The apparatus includes a cylindrical retainer form spaced inwardly of the wall of the shaft by the desired thickness of the liner to be poured and having overlapping edges which seal against concrete flow but permit the form to be contracted to a smaller circumference after the liner has hardened and is self-supporting. A curb ring extends downwardly and outwardly toward the shaft wall from the bottom of the retainer form to define the bottom surface of each poured liner section. An inflatable toroid forms a seal between the curb ring and the shaft wall. A form support gripper ring having gripper shoes laterally extendable under hydraulic power to engage the shaft wall supports the retainer form, curb ring and liner until the newly poured liner section becomes self-supporting. Adjusting hydraulic cylinders permit the curb ring and retainer form to be properly aligned relative to the form support gripper ring. After a liner section is self-supporting, an advancing system advances the retainer form, curb ring and form support gripper ring toward a shaft boring machine above which the liner is being formed. The advancing system also provides correct horizontal alignment of the form support gripper ring.
REFERENCES:
patent: 3074237 (1963-01-01), Lilly
patent: 3377669 (1968-04-01), Burgess
patent: 3561223 (1971-02-01), Tabor
patent: 3788087 (1974-01-01), Patin
patent: 4067675 (1978-01-01), Hanson
patent: 4147453 (1979-04-01), Unger et al.
patent: 4205949 (1980-06-01), Hanson
Eklund James D.
Halter Joseph M.
Moffat Robert B.
Rasmussen Donald E.
Sullivan Robert G.
Denny James E.
Fisher Robert J.
Friedman Carl D.
Glenn Hugh W.
The United States of America as represented by the United States
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