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Class Information
Number: 405/139
Name: Hydraulic and earth engineering > Underground passageway, e.g., tunnel > Boring > With auxiliary tunnel
Description: Method or apparatus wherein a subsidiary passage is employed in the construction of the main corridor.

Patents under this class:

Patent Number Title Of Patent Date Issued
7004679 Easily-cuttable tunnel segment structure Feb. 28, 2006
6520718 Sardine-bone construction method for large-section tunnel Feb. 18, 2003
5451315 Ore pass shaff water drainage means Sep. 19, 1995
5199817 Process of providing an elongate underground cavity Apr. 6, 1993
5118220 Method of building underground cavern and tunneling machine Jun. 2, 1992
5104259 Method for excavating rock cavities Apr. 14, 1992
4166509 Process for excavating and constructing tunnel and excavating device Sep. 4, 1979
4147452 Method for constructing a rectangularly shaped tunnel Apr. 3, 1979
3996751 Method of blasting and reinforcing rock cavities Dec. 14, 1976
3968655 Method of reinforcing tunnels before excavation Jul. 13, 1976

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