Sinking pits or wells involves filling concrete in shell, compressing, removing soil to let concrete lower, introducing/compressing more concrete, removing more soil to let concrete, repeating until shaft at required depth, removing shell

摘要

The method involves erecting a stationery horizontal working platform in a central region on the ground, erecting a double-walled stationary shell on the platform, attaching a dual-sided cutter whose outer cutting side is at least approximately vertical, attaching armoring and connecting it to the cutter, introducing concrete into the shell and compressing it, removing soil to allow the concrete to lower, introducing and compressing more concrete, removing more soil to allow the concrete to lower and repeating until the shaft reaches the required depth, then removing the shell.