| 摘要 |
<p>The present invention relates to a method for widening road, superhighway or railway tunnels, without interrupting the traffic. The method comprises: a first step in which is carried out a boring for samples of the soil included between the theoretic profile of the widened tunnel to be made and that of the old existing tunnel, after having possibly operated on the soil included between the theoretic profile of the widened tunnel to be made and that of the old existing tunnel, by reinforcement operations on the boring front and precontainment operations of the widening cable, and a second step in which the final coating, comprising one or more arches of prefabricated quoins is laid, in samples, close to the boring front, according to "active vault" principle. <IMAGE></p> |
