Double-wall type shoulder beam structure

The invention discloses a double-wall type shoulder beam structure. The double-wall type shoulder beam structure comprises two shoulder beam web plates, an upper cover plate, a lower cover plate and two upper column flange plates, wherein the two shoulder beam web plates and the two upper column flange plates are perpendicular to one another and arranged in an encircling manner between the upper cover plate and the lower cover plate which are parallel with each other; after welding connection, a fully closed structure is formed; and manholes are formed in the middle of the lower cover plate and in positions, near the lower cover plate, on the upper column flange plates. Workers enter a shoulder beam through the manholes to perform welding and can make double-sided fillet seams, so the work load of welding is greatly reduced and the work quality is guaranteed; and the double-sided fillet seams are made, so the seams are distributed uniformly and stress concentration is reduced.