Method for constructing an enlarged tunnel and apparatus for forming the same
AssigneeMitsui Kensetsu Kabushiki Kaisha
InventorsShigeo Takamiya, Kazutoshi Inoue, Kenzo Tsutaya
Life of this patent
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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.
Claims13
A method for constructing an enlarged tunnel wherein a portion of a predetermined region of an existing tunnel to be enlarged is circumferentially enlarged by the following steps:
- excavating to form a circumferentially enlarged portion defining a starting base for a shield machine;
- positioning a shield machine in the circumferentially enlarged portion;
- cutting a tubular liner lining the existing tunnel into segment pieces;
- advancing the shield machine forward along the existing tunnel in order to enlarge the circumference of the predetermined region of the existing tunnel;
- removing those segment pieces of the liner of the existing tunnel;
- and
- circumferentially lining the resultant enlarged tunnel portion with segments.
An apparatus for constructing an enlarged tunnel comprising:
- cutting means for cutting a tubular liner lining an existing tunnel;
- removing means for removing cut pieces of the tubular liner;
- a shield machine for enlargement of the existing tunnel, said shield machine being assembled and disassembled within said enlarged tunnel and being provided with an excavating means for excavating the enlarged tunning and a jack means for advancing the shield machine along the enlarged tunnel;
- and
- an assembling means for applying segments to the inner circumferential surface of the circumferentially enlarged portion.
Dependencies are inferred from the claim text.