EXCAVATION METHOD OF THICK FLAT-LYING COAL SEAM WITH FAST ROOF Russian patent published in 2008 - IPC E21C41/18 

FIELD: coal mining.

SUBSTANCE: method is based on debugging room-and-pillar system and includes mine section treatment in layer near roof of the seam with transport 1 and ventilation 2 workings with sequential installation of extraction chambers from transportation 1 till ventilation 2 working in descending order. At that roof and rim of excavating chambers 5.20 are fixed with anchoring steel polymer shoring. Coal excavation is carried out with frontal function combine 4 in interchamber pillars 21 by diagonal entry way 8,10,22,23, directed at the angle 120...135 degrees to axle of excavating chamber from the both sides. Entry way roof is fixed with anchor shoring. Broken-down coal transportation to transport working 1 is carried out by self-propelling car 6. Between entry ways 8,10,13 one leaves under breaking pillars 8,15. After the excavation of several entry ways in layer at the roof of the seam by the same combine 4 one deepens excavating chamber 20 till seam ground and take out end entry way 12 under corresponding entry way 8 in layer at roof of the seam, i.e. under anchoring shoring. After entry way excavation in layer at seam ground combine is returned to chamber ground in layer at roof of the seam and excavation of several entry ways in that layer is carried out. Then the chamber is deepened till layer ground and several entry ways are excavated in the layer at seam ground and so on. Axis slope angle of excavating chamber, entry ways, transportation and ventilation workings and ramps to the horizon are taken no more admissible for applied mechanised systems for scouring works, and entry way length is no more than combine length. Entry ways, worked from the next chamber side in one interchamber pillar, are located in checkerboard order as to entry ways, worked from the side of previous chamber.

EFFECT: improvement of working effectiveness and changing of transport means of continuous action on means of cycling action.

2 cl, 3 dwg