Methods and apparatus for constructing tunnels

Details Methods and apparatus for constructing tunnels Methods and apparatus for constructing tunnels

1975-10-14

1977-01-18

Taylor, Dennis L.

61 42, 52310, E01G 508, E01G 516

Patent

active

040032116

ABSTRACT:
In a tunnel driving apparatus which employs hydraulic rams for advancing a shield in the direction of tunnel advancement, a thrust ring is used as a support for the rams. Lining sections are installed at the rear side of the thrust ring as the latter is shifted up. These lining sections are each spaced from the exposed tunnel wall when installed to receive fluid concrete used to form a tunnel lining. The thrust ring defines chambers, one of which has filter means which faces the concrete reception space and contacts the concrete therein. Water is withdrawn from the concrete by suction created by reducing the pressure in the chambers and the other of the chambers is used to collect the water. Inflatable packings are used to seal off the concrete reception space and can be deflated when the thrust ring is shifted up.

REFERENCES:
patent: 1286666 (1918-12-01), Layne
patent: 3379024 (1968-04-01), Wohlmeyer
patent: 3410098 (1968-11-01), Winberg
patent: 3561223 (1971-02-01), Tabor
patent: 3611735 (1971-10-01), Daczko
patent: 3827244 (1974-08-01), Wolbrohl
patent: 3834170 (1974-09-01), Lobbe et al.

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