The invention discloses an installing and constructing method of a special-shaped tie bar, an
arch bridge and an arch ring. The few-support method manufacturing and installing method of only arrangingtemporary support steel
pipe piles at rod piece joints specifically includes the steps of making a preparation before construction, constructing temporary supports in water, hanging steel arch ribs,installing folding sections of the steel arch ribs,
welding bridge positions, installing arch rib hanging rods and detaching arch rib temporary supports. During construction, a prefabricating and splicing mode is adopted, splicing is conducted through floating cranes, and the occupation and
pollution of a water domain under a bridge are reduced; the multiple procedures are operated in parallel, the construction progress is accelerated, and the construction period is shortened; the temporary supports are only arranged at joint annular seams of large-section arch rib sections, the supports are small in occupied space, the passage under the bridge in the construction state is facilitated, and the influences on the passage under the bridge in across-lake construction and the surrounding socialenvironment are reduced; the errors of the steel arch rib sections are effectively reduced in the construction process, precise positioning and
welding are achieved, and the linear manufacturing precision of the special-shaped arch ribs is ensured.