Large-section coupling support structure for gob-side entry driving, and construction method thereof

The invention relates to a large-section coupling support structure for gob-side entry driving. The large-section coupling support structure comprises a top plate part, a gob side part, an entity coalside part and bottom angle anchor tubes; the top plate part comprises phi 20*2400 mm anchor rods I, phi 6 mm steel reinforcing meshes I, phi 20 mm steel reinforcing ladders I, and phi 17.8*6500 mm anchor cables; the gob side part comprises phi 6 mm steel reinforcing meshes II, 400*400*12 mm steel plate trays, and anchor cables for crossheading support of the previous working face; the entity coalside part comprises phi 20*2400 mm anchor rods II, phi 6 mm steel reinforcing meshes II, and phi 20 mm steel reinforcing ladders II; and waste steel tubes are utilized as the bottom angle anchor tubes, and external binding for 45 degrees is conducted to control floor heave. A construction method of the large-section coupling support structure for gob-side entry driving comprises the five steps ofpre-grouting of coal pilla