The invention provides a construction method for assembling steel box girders, which is used for the hoisting construction of the steel box girders during the road and bridge construction. The method comprises the steps as follows: a first
steel box girder section is hoisted; a second
steel box girder section is hoisted and suspended on the soleplate of the first
steel box girder section; a connecting clamp plate is arranged at the top plate of the first steel
box girder section and the second steel
box girder section and is respectively suspended on top of the first steel
box girder section and welded on the top of the second steel box girder section; hoisting equipment is removed; the
mutual position of the steel box girder sections is adjusted and the steel box girder sections are welded to each other; the connecting clamp plate is removed; the temporary
pier is removed; and the
assembly is completed. As the residual
assembly is adopted, the steel box girder construction under complex construction environment has large elasticity, thus ensuring the
assembly precision and quality; the loading form is adopted to carry out the assembly of the steel box girder, thus solving the problem that the temporary
pier is difficult to be arranged when the site is restricted; the construction time of hoisting equipment and the use of the temporary piers are reduced; and the whole assembly process is simple, feasible, safe, reliable, economical and reasonable.