The　main　bridge　of　Wumeng　Mountain　Bridge　on　Guizhou　Naqing　Expressway　is　a　through　steel　truss　concrete　composite　arch　bridge　with　a　calculated　span　of　270m.　On　the　basis　of　traditional　rigid　skeleton　arch　bridges,　the　bridge　uses　steel　web　members　instead　of　concrete　web　plates　to　reduce　the　structural　self　weight.　The　main　arch　ring　adopts　a　steel　truss　concrete　composite　section,　and　the　lifting　weight　of　the　segment　is　reduced　by　forming　the　arch　ring　section　in　stages.　The　arch　ring　of　the　bridge　adopts　cable-stayed　buckle　hanging　and　cable　hoisting,　prefabricated　and　assembled　construction,　and　its　segment　connection　is　first　connected　by　steel　chord　rods　embedded　in　the　concrete　top　and　bottom　plate　of　the　arch　ring,　and　then　connected　by　pouring　segment　wet　joints.　As　the　first　steel　truss　concrete　composite　arch　bridge,　the　Wumeng　Mountain　Bridge　has　significantly　improved　the　quality　control　and　safety　risk　reduction　of　concrete　arch　bridge　construction,　and　also　enriched　the　construction　technology　of　the　steel　concrete　composite　arch　bridge,　with　high　innovationg.　©　The　Author(s),　under　exclusive　license　to　Springer　Nature　Switzerland　AG　2025.