TUNNEL ELEPHANT FOOT REINFORCEMENT BEAM CONSTRUCTION METHOD FOR TUNNEL STABILIZING

摘要

The present invention provides a tunnel elephant foot reinforcing tie beam construction method for tunnel stabilization capable of securing a stability of a tunnel by stably distributing a bearing power to the elephant foot reinforcing steel pipes when excavating the ground for an upper part or a lower part of the tunnel without disturbing the ground right under the steel ribs using an elephant foot reinforcing tie beam while reducing a required time regardless of a depth of the tunnel depth or a place where the tunnel is constructed. According to a desirable embodiment of the present invention, the tunnel elephant foot reinforcing tie beam construction method comprises: a step of installing the upper steel ribs in the upper part of the tunnel in a tunnel excavation direction at constant intervals to be vertical to an upper side; a step of fixating and installing the tunnel elephant foot reinforcing tie beam to the lower parts of the upper steel ribs between the upper steel ribs installed in the upper part of the tunnel; and a step of forming bore holes at a required depth to the lower part of the tunnel in the central parts of the tunnel elephant foot reinforcing tie beams separately, inserting the tunnel elephant foot reinforcing steel pipe into the bore holes, and thereafter fixating the upper parts of the elephant foot reinforcing steel pipes to the tunnel elephant foot reinforcing tie beams.