Unsupported large-span hyperbolic cross-city viaduct steel box girder sectional construction method

Abstract

The invention provides an unsupported large-span hyperbolic cross-city viaduct steel box girder sectional construction method. The method comprises the steps that S1, other girder sections except a first arc girder section and a second arc girder section in a cross-bridge section are installed in advance; S2, the first arc girder section is hoisted firstly, and the two ends of the first arc girdersection are connected with two fractures of the cross-bridge section correspondingly; S3, the second arc girder section is hoisted, the two ends of the second arc girder section are connected with the two fractures of the cross-bridge section correspondingly, and the arc joint of the second arc girder section and the arc joint of the first arc girder section are connected; and S4, hoisting is completed, and a crane evacuates from the site. According to the method, a support-free hoisting is adopted, a temporary buttress does not need to be erected on an existing bridge during construction, the influence on traffic on the bridge during buttress erection is avoided, the number of cross-bridge sections is smaller than that of cross-bridge sections adopting a conventional hoisting method, thehoisting progress is accelerated, meanwhile, the number of welded junctions and the length of weld joints are reduced, the construction time of the cross-bridge sections is shortened, and the influence on the ground traffic for a long time is also avoided.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to a segmental construction method for a steel box girder of an unsupported large-span hyperbolic cross-urban viaduct. Background technique [0002] Shenyang Changqing Street Expressway Project At the intersection of Wanliutang Road and Changqing Street, the East First Ring Road and the main bridge of Changqing Street are connected through A and B ramps, of which B ramp crosses the existing East First Ring Viaduct, and the beam bottom elevation of B ramp 15.5m, the difference between the bottom of the bridge and the deck of the East First Ring Road is 4.8m. The construction site is located in a traffic artery, and the traffic pressure is high. If the conventional hoisting method is adopted, large-scale hoisting equipment is required, or temporary buttresses are set up on the East First Ring Bridge, and a large construction site is required, which will inevi...

AI Technical Summary

Problems solved by technology

The construction site is located in a traffic artery, and the traffic pressure is high. If the conventional hoisting method is adopted, large-scale hoisting equipment is required, or temporary buttresses are set up on the East First Ring Bridge, and a large construction site is required, which will inevitably seriously affect traffic.

Images