Arch cover structure of tunnel underneath-crossing riverway

The arch cover structure comprises an arch cover arranged above the tunnel, blocking beams are arranged between the two ends of the arch cover and river banks on the two sides respectively, bottom beams are connected to the two sides of the arch cover respectively, a joist is arranged above the middle of the arch cover, and the joist is arranged in the longitudinal direction of the tunnel. The twoends of the joist are connected with the two blocking beams respectively, backfill layers are arranged above the arch cover, the bottom beam and the joist, and reinforced concrete layers are arrangedon the top faces of the backfill layers. The arch cover structure can effectively support the area above the tunnel to meet the requirements of traffic load and people flow traffic load, foundation pit excavation and construction of a tunnel main body structure can be carried out under the supporting effect of the arch cover structure, the traffic capacity and construction safety are effectivelyguaranteed, and through the