CFT 2 2 2 Double order system adjusting horizontal length of steel pipe supporter in the tunnel and the structure of the pipe supporter and method constructing thereof

摘要

The present invention relates to a dual-walled installation system for a steel girder by means of a length-adjustable steel pipe supporting member and a CFT steel pipe supporting member reinforced by the filling and stiffness. The horizontal extending member (S) of the ceiling crown (C) The horizontal length of the arch-shaped upper half-section steel pipe support is expanded and adjusted by the length adjusting pipe (P) so that the interval between the tunnel base where the over-bore is generated and the arch-like upper half- As the main purpose is to extend and adjust the horizontal length, the arched upper semi-section steel pipe support is horizontally moved toward the tunnel ground, so that the excavation interval of the ground and the upper half steel tube support of arches is minimized and the shotcrete transfer It is a useful invention that minimizes the cost and makes the tunnel construction possible.