PROTECTION METHOD OF DEVELOPMENT DRIFTS Russian patent published in 2008 - IPC E21D11/00 

FIELD: mining engineering.

SUBSTANCE: invention falls within the realms of mining industry and can be used for protection of development drifts. The method involves the use of belt roadway of one pillar as ventilation for an adjacent pillar. In the belt roadway after passing a mining face pneumocylinders are placed. In addition, at the same time of belt roadway operations, a bench is made along its entire length at a step of entry way and the pneumocylinders are placed into it. When an extraction pillar is mined in the opposite direction, a pneumocylinder nearest to the powered roof support of the mining face is discharges and taken out to the belt roadway. H-frame structures are put on the bed soil behind the support of the mining face and the pneumocylinders are placed inside them. After shifting the structures due to rock pressure and contact of the walls of the H-frame structures with the bed soil, the pneumocylinders are discharged and taken out to the belt roadway. After making a bench, mine props with beams are installed inside it. The beams are located along the belt entry and the pneumocylinders are placed in the gaps between the props under the beams with their longer side perpendicular to the entry. Compressed air is supplied which presses the support bars to the bed roof. Besides, the support bars are placed with a shift in relation to a pair of central support bars and in relation to one another at the width of one pneumocylinder. When mining an extraction pillar in the opposite direction, a pneumocylinder nearest to the powered roof support of the mining face and the nearest mine props are discharged and taken out to the belt roadway, and the upper canopies of the powered roof support section support the nearest ends of the support bars.

EFFECT: more effective protection of development drifts and reduction in their maintenance costs for their reuse.

11 dwg