Ring frame beam device for shield launching and mounting method of ring frame beam device

The invention discloses a ring frame beam device for shield launching and a mounting method of the ring frame beam device. The ring frame beam device comprises a steel ring frame beam and multiple jacks uniformly distributed along the circumference of the steel ring frame beam, wherein the steel ring frame beam is formed by splicing a plurality of arc-shaped components; a front steel plate and a rear steel plate are arranged on two end surfaces of each arc-shaped component; each jack is located between each front steel plate and each corresponding rear steel plate; a jack extension hole matched with each jack is formed in each corresponding front steel plate, and the diameter of each jack extension hole is larger than the outer diameter of the extension end of each jack. A steel sleeve and a tunnel portal can be always in a pressure pressed state through adjustment of the jacks, and situations that a tunnel portal structure is damaged by the reverse action force during shield launching and the construction safety is influenced are avoided. The ring frame beam device can be used for work procedures requiring the reverse force in shield launching construction, is convenient to mount and dismount, is seldom restricted by the site and can be repeatedly used.