Existing line protection structure

The utility model relates to an existing line protection structure, including existing hangar tunnel and open cut tunnel, the open cut tunnel is including locating the vault and the support of existing hangar tunnel top the load bearing structure of vault. The application existing line protection structure, for the inlayer be existing hangar tunnel, the skin is the two -layer structure of open cut tunnel, the wholeness is better, can bear great vertical force and lateral pressure, safety stock is high, even if the also very difficult effective threat of existing hangar tunnel formation to the inlayer behind the outer open cut tunnel of falling rocks puncture, protection level has been improved, the open cut tunnel is construct at existing hangar tunnel outerly, do not destroy existing hangar tunnel structure, it is little to the massif disturbance, the influence of building in large scale the operation of existing circuit has been avoided tearing open greatly, the reconstruction cost is reduced. 本实用新型涉及既有线路防护