Tie bar arch type large-span first-aid repair beam and erection method thereof

The invention relates to a tied arch type large-span first-aid repair beam and an erecting method thereof. The first-aid repair beam comprises two sets of main arch structures which are horizontally and symmetrically arranged, a plurality of cross beams connected with the two sets of main arch structures and a bridge deck system arranged between the two main arch structures. The main arch structure comprises an arch rib, a telescopic straining beam, a plurality of suspenders and inhaul cables. The arch rib comprises two arch rib end joints, a plurality of arch rib standard joints and a plurality of span adjusting wedge blocks matched with the arch rib end joints and the arch rib standard joints. The arch rib standard knots and the arch rib end knots are single components with fixed lengths respectively, the span adjusting wedge blocks are series components adaptive to different spans, the arch ribs adaptive to different spans can be assembled by adjusting the number of the arch rib standard knots and assembli