Method for constructing an enlarged tunnel and apparatus for for

Details Method for constructing an enlarged tunnel and apparatus for for Method for constructing an enlarged tunnel and apparatus for for

1984-03-30

1986-10-21

Taylor, Dennis L.

Hydraulic and earth engineering

Underground passageway, e.g., tunnel

Lining

405146, 405138, E21D 1100, E21D 906

Patent

active

046182985

ABSTRACT:
A method and apparatus for constructing an enlarged tunnel in a portion of a predetermined region of an existing tunnel. A circumferentially enlarged portion is excavated to define a starting base for a shield machine. The shield machine is positioned in the circumferentially enlarged portion and advanced forward along the existing tunnel in order to enlarge the circumference in the predetermined region of the existing tunnel. A section of a tubular liner lining the existing tunnel is broken and removed therefrom. Thereafter, the resultant enlarged tunnel portion is lined with segments.

REFERENCES:
patent: 1278932 (1918-09-01), Hughes
patent: 2743087 (1956-04-01), Layne et al.
patent: 2903252 (1959-09-01), Ebeling
patent: 3523426 (1970-08-01), Lauber
patent: 4530621 (1985-07-01), Furuta et al.
Publication entitled "Explanation of Shield Driving Process for Enlargement, " Jul., 1982.

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