Rock anchor beam structure, underground powerhouse structure and construction method of underground powerhouse structure

The invention discloses a rock-anchored beam structure, an underground powerhouse structure and a construction method of the underground powerhouse structure. The problems that in the prior art, rock-anchored beam construction efficiency is low, and disturbance to peripheral rock walls is large are solved. The rock-anchored beam structure comprises a beam body, and the outer side face of the beam body is an arc-shaped face. Preferably, the inner side face of the beam body comprises a top plane and an inner side vertical face, the upper portion of the arc-shaped face is connected with the top plane, and the lower portion of the arc-shaped face is connected with the inner side vertical face through a bottom inclined face. The underground powerhouse structure comprises the rock-anchored beam structure. Upper side walls are connected to the upper portions of the rock-anchored beam structures, lower side walls are connected to the lower portions of the rock-anchored beam structures, and a dome structure stretches