The application relates to a construction method for reconstructing a steel truss
arch bridge by using an existing bridge, which comprises the following steps: after the completion of the closure of the side span steel truss arch, the lower support, the side beam, the upper support and the end section of the main span steel truss arch are sequentially erected from bottom to top on the side of the side span steel truss arch close to the main span; after the erection of the
bridge deck support with the overhanging
cantilever on the
deck of the old bridge, the section of the middle beam is erected to the closure opening through the overhanging
cantilever, the section is positioned, the closure of the beam is completed; the middle section of the main span steel truss arch is erected on the upper support and the
bridge deck support, and the closure of the main span steel truss arch is completed; the temporary
wind brace is installed, the sling is installed, the upper support and the
bridge deck support are removed, the sling is tensioned, and the lower support is removed; the
deck of the old bridge is
cut and the cross beam is installed according to the sequence from the middle span to the side span, and the bridge
deck is installed. The application has the advantages of ensuring the installation stability of the arch beam, improving the construction efficiency and reducing the construction cost.