JUC method This method is used to create one new tunnel branching off from another tunnel or to join one tunnel to another tunnel without constructing a vertical shaft. By using this method, the effects of tunnel renovation or excavation work on the surrounding environment can be significantly reduced and the work period also shortened at the same time. With this approach, special segments are installed in the tunnel to be worked on first so that tunnel branching or joining work can be done using ordinary shield machinery. P&PC segment method and ring lock segments With the P&PC segment method, a prestress force is applied circumferentially or in the direction of the tunnel axis to bring installed segments into firm contact with each other thereby forming a solid tunnel structure. The P&PC segment method, which was developed to construct shield tunnels, is not only cost-efficient but also very effective for constructing tunnels in land subject to high in...
Engineering & interesting stuff !!!