Auxiliary roof contacting device for tailing filling and construction method thereof

The invention discloses an auxiliary roof contact device for tailing filling and a construction method thereof. The device comprises an elastic film bag, a filling pipeline and a pressure control device; one end of the filling pipeline is connected with the elastic film bag; and the other end of the filling pipeline is connected with the pressure control device. According to the device, the elastic film bag is used for making up a roof shrinkage gap generated in a condensation process of a tailing cementation body, an uniform jacking effect on a goaf roof is achieved, the roof contacting quality is improved, and goaf collapse is effectively prevented; in a hydration process of the tailing cementation body, the roof is always kept in a stress state, ground pressure is kept stable, normal production of surrounding ore bodies is guaranteed, and the recovery rate is increased; and tailings are fully utilized, economic and environment-friendly effects are achieved, waste accumulation is reduced, and geological hid