Method for underground excavation

Method for widening road, superhighway or railway tunnels,...

Method of and apparatus for building thin lining on tunnel

Method of and apparatus for concrete tunnel lining

Method of and apparatus for concrete tunnel lining

Method of and apparatus for horizontally and vertically guiding

Method of and apparatus for the lining of a tunnel with concrete

Method of building underground cavern and tunneling machine

Method of connection

Method of constructing reinforced concrete works such as undergr

Method of creating a cold water conduit to be used in ocean ther

Method of excavating tunnels

Method of forming flooring in tunnels

Method of forming underground ducts, conduits and the like

Method of installing a liner in a large diameter borehole

Method of lining a tunnel and apparatus for performing the same

Method of lining a vertical mine shaft with concrete

Method of making a huge elongated space of square or rectangular

Method of making covering wall of tunnel made by shield type exc

Method of manufacturing a tunnel or shaft lining or pipeline