CONSTRUCTION METHOD FOR LARGE CAVITY SECTION AT ULTRA-DEEP UNDERGROUND

摘要

PURPOSE:To easily perform construction by fitting a drilling machine to a guide pipe vertically provided in a large-diameter vertical shaft, forming a large cavity section, and applying lining on the inner wall face of the large cavity section with a spraying machine fitted to the guide pipe. CONSTITUTION:A hollow guide pipe 2 is erected at the center of a small- diameter vertical shaft, a guide wall 3 is constructed around the opening side of the small-diameter vertical shaft, and the inner side is expanded and drilled. A rotary drilling machine is coupled on the outer periphery of the pipe 2, the periphery of the small-diameter vertical shaft is expanded via mud water drilling by the drilling machine 5 to the preset depth to construct a large-diameter vertical shaft 4. A large cavity section 14 is dug by a reclaimer type drilling machine 13 fitted rotatably and movably along the pipe 2, and the drilled sediment is discharged on the ground by an elevator provided in the pipe 2. Lining is applied to the inner wall face of the large cavity section 14 by a spraying machine 15 fitted rotatably and movably along the pipe 2.