FIELD: construction engineering. SUBSTANCE: underground suspended tunnel has main load-bearing girth located inside tunnel and fastened to structures of lining with end guys which are anchored in anchoring units located beyond boundaries of dangerous section of route in reliable ground. Axis of tunnel coincides with trajectory of calculated sagging curve of load-bearing girth that is with square parabola. In other version, underground suspended tunnel is made up of main purpose tunnel laid in route of any configuration and additional pilot tunnel of small diameter which is preliminarily laid above main purpose tunnel over calculated trajectory that is square parabola. Passing inside additional pilot tunnel is main load-bearing girth having end guys which are anchored by means of anchoring units. Main load-bearing girth is connected with load-bearing lining of main tunnel by means of vertical flexible hangers or rigid links distributed along it. Also permissible is to have underground suspended tunnel which is made up of two tunnels of main purpose laid through route of any configuration and additional pilot tunnel of small diameter preliminarily constructed under it according to calculated trajectory that is square parabola. In this case, main tunnels within limits of dangerous section are connected to each other structurally or by means of rigid links. Both main tunnels rest on pilot tunnel. Passing inside pilot tunnel is load-bearing girth with end guys which are anchored by anchoring units located beyond boundaries of dangerous section of route. Aforesaid arrangement of construction allows for building new underground tunnels in any ground irrespective of its load-bearing capacity. EFFECT: higher efficiency. 3 cl, 10 dwg
