Double-deck continuous steel girder bridge for rigid suspended cable stiffening

Abstract

The invention discloses a double-deck continuous steel girder bridge for rigid suspended cable stiffening, relating to a double-deck continuous steel girder bridge. Lower ends of rigid suspenders and lower ends of pivot stand columns are connected with primary truss joints; upper ends of the rigid suspenders and upper ends of pivot stand columns are connected with stiffened chord joints of rigid suspended cables; and when stiffened chords are adopted, vehicles are allowed to travel on both an upper bridge surface and a lower surface of a primary truss. In the invention, the stiffening suspender stiffened chords can load force together with the primary truss at a dead load state; the primary truss has short girders and low steel consumption; approach bridges can be shortened and cross connecting systems can be vacantly arranged or less arranged so as to save construction cost; with a space above, the primary truss can be used as a double-deck bridge and provided with multiple lanes in a stereoscopic way, thereby further saving cost and land resources; when constructing, special equipment and technology are not needed, and the double-deck continuous steel girder bridge can be manufactured, installed uniformly with simple construction; moreover, the rigid suspended cable stiffening chords have attractive curve appearance; and the double-deck continuous steel girder bridge has no anchorage free in bridge type, and has reasonable force-loading, low requirements on geology and terrain, and wider adaptability.

Description

technical field [0001] The invention relates to a double-layer continuous steel truss bridge. Background technique [0002] At present, most long-span steel truss bridges adopt the technical measures of setting stiffening strings under the main truss, such as the Nanjing Yangtze River Bridge. Due to the elevation of the lower part, the height of the bridge deck increases and the length of the approach bridge increases, resulting in a higher total cost. [0003] At present, steel truss bridges with stiffening chords are used above the main truss. The stiffening chords can only be stressed together with the flat chords under the action of the second-stage dead load and live load, which plays a small role and cannot effectively reduce the main chord. The truss height of the truss is not much different from that of the equal-height steel truss girder, and because the stiffening chord and suspender are less stressed, the stiffness is correspondingly smaller, and a large number of...

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Problems solved by technology

[0002] At present, most long-span steel truss bridges adopt the technical measures of setting stiffening strings under the main truss, such as the Nanjing Yangtze River Bridge. Due to the elevation of the lower part, the height of the bridge deck increases, and the length of the approach bridge increases, resulting in a higher total cost.

[0003] At present, steel truss bridges with stiffening chords are used above the main truss. The stiffening chords can only be stressed together with the flat chords under the action of the second-stage dead load and live load, which plays a small role and cannot effectively reduce the main chord. The truss height of the truss is not much different from that of the equal-height steel truss girder, and because the stiffening chord and suspender are less stressed, the stiffness is correspondingly smaller, and a large number of transverse connections are needed to maintain its own stability. Many, and no upper deck

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