Construction method and structure for underground construction confined concrete shoring prestressed steel strands

The invention relates to a construction method and structure for underground construction confined concrete shoring prestressed steel strands. The method comprises the following main steps: 1, excavating a tunnel, conducting anchoring and shotcreting construction, erecting a concrete filled steel tube arch center, constructing a bottom arch, and completing the installation of a confined concrete filled steel tube arch center; 2, fixing the starting end of one steel strand to an anchoring clamping head, wherein the anchoring clamping head clamps the steel strand onto an arch center cable passing hole, and then the steel strand pass through the holes in sequence as per an anchor rod or anchor cable passing hole, an arch center cable passing hole, an anchor rod or anchor cable passing hole and an arch center cable passing hole, thereby a W-shaped continuous grid is formed; 3, connecting the steel strand penetrating out of the W-shaped continuous grid to a stretching-drawing machine, starting the stretching-drawing machine to apply prestress to the steel strand, and stopping the stretching and drawing when the prestress reaches a required value; 4, then making the steel strand pass through subsequent holes till a next W-shaped continuous grid is formed; repeating the step 2 and the step 3, and finally applying corresponding prestress to all the steel strands.