Single bracket for retreating type pillar type mining during chamber-and-pillar working

The invention relates to a method for pillar recovery in chamber-and-pillar working of materials and raw materials in underground stratified beds, and to tubbing units 10 which can be advantageously used in the method. According to the invention the extraction device is aligned obliquely to the pillar galleries and the roof is supported in front of the retreat face of the extraction device with aplurality of tubbing units 10 , which are adjustable in height and width and can be moved by means of a vehicle 50 through set tubbing units 10 to another position and can there be reset.