Arch-after-girder construction method of large-span steel box tacked arch bridge

Abstract

The invention relates to an arch-after-girder construction method of a large-span steel box tacked arch bridge. The construction method comprises the following steps of: respectively building two temporary reinforced concrete bar-shaped bases on the ground at the bottom parts of steel girders on two sides of a to-be-built steel-structure bridge; mounting a plurality of temporary supporting piers on the reinforced concrete bar-shaped bases; respectively mounting steel girder assembling platforms on two external sides of the two bar-shaped bases; and paving portal crane rails on two sides of the steel girder assembling platforms and mounting two portal cranes. In the construction method, arch ribs, lifting rods and bridge surfaces engineering are carried out after system girders, end transverse girders and vertical transverse girders are mounted to form a whole stressed system by combining with temporary main supporting piers. The construction method has the advantages of low construction investment, specific structure stress, and simple and convenient construction process, and can realize parallel construction; all the steel components are hoisted by adopting the running-type portal canes, thereby reducing a great amount of mounting and dismantling work of the scaffoldings in the high altitude, and reducing the mounting period of the box girders; and the steel components can beassembled under the bridge during the transporting time of thebox girders, which increases the safety coefficients, and improves the structural quality.

Description

technical field [0001] The invention belongs to the field of bridge construction, and in particular relates to a construction method for a long-span steel box-stacked arch bridge of "beam first and arch later". In this method, after the tie beams, end beams, and longitudinal beams are installed and combined with the temporary pier structure to form an overall stress system, the arch ribs, suspenders, and bridge deck systems are carried out, which greatly shortens the erection period of the box girder and is effective. The delay of the construction period caused by the construction of the steel bridge arch is avoided. Background technique [0002] On urban roads and highways, the traditional construction method of steel box stacked arch bridges mainly adopts "arch first, then girder". The arch ribs are symmetrically assembled, and the arch rib segments are hoisted and assembled by crawler cranes, and finally the second phase of the bridge deck is constructed with dead load. ...

AI Technical Summary

Problems solved by technology

The traditional construction method has the following deficiencies and defects: 1) The construction process is complicated and the construction period is long; 2) If the steel box stacked arch bridge is located on the girder erection channel, after the arch ribs, suspenders and other important load-bearing structures are completed, the girder transporter must pass Erection of box girders, the result is that the construction period of box girders is prolonged and the cost of beam yards is increased; 3) Traditional hoisting methods such as arch rib segmental support method and cable crane are greatly restricted by terrain factors, which are not conducive to construction organization, and the construction cost is relatively high

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