A Cantilever Erection Method of Zhonglun Steel Truss Girder in Cable-Stayed Bridge

Abstract

The invention discloses a cantilever erection method for a Chinese Lun-style steel truss girder of a cable-stayed bridge, and relates to the technical field of bridge construction. Install the steel truss units located between the top sections of the pier, and install a girder crane on the upper bridge deck at both ends of the pier top section, and the two girder cranes will work synchronously on both sides of the main tower; During construction, the girder erecting cranes on each side of the main tower first splice a lower bridge deck with diagonal web bars spliced ​​in advance with the lower deck of the steel truss unit installed last time; Splice the upper deck of the steel truss girder unit that has been installed for the second time; finally, the girder erecting crane travels to the side to be installed for a distance of 1 internode length, hangs and tensions the stay cables; repeats the above-mentioned common construction method for splicing until Erection above the auxiliary pier or between the joints of the dragon. The invention reduces the production cost without affecting the construction speed.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a cantilever erection method of a Chinese Lun type steel truss girder of a cable-stayed bridge. Background technique [0002] With the scarcity of bridge site resources, steel truss girder cable-stayed bridges have been built more and more in recent years by virtue of the advantage that both upper and lower decks can pass. Among the steel truss cable-stayed bridges, the Warren-type steel truss girder without vertical bars has become the most reasonable steel truss structure of cable-stayed bridges due to its characteristics of fewer bars, fewer joints, and light weight. [0003] see figure 1 and figure 2 As shown, the Warren-style steel truss girder is spliced ​​sequentially by several steel truss girder units 1, and each steel truss girder unit 1 includes an upper bridge deck 11 and a lower bridge deck 13 of equal length, and each upper bridge deck The surface 11...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: 1. Since the components of the steel truss beam unit are hoisted separately, the number of hoisting times of the full-slewing girder crane is too large, which affects the construction speed

2. The components of the steel truss beam unit need to be spliced ​​on site, and there are many joints between the components, which affects the construction speed

This method has the following disadvantages: 1. Since the full-slewing girder crane not only improves the single hoisting weight, but also increases the length of its lifting arm (the longest length of 2.5 internodes is required), the corresponding full-slewing girder crane is required. Increase the hoisting tonnage to withstand the large-tonnage hoisting load, resulting in heavy weight and high cost of the full-slewing beam crane, which increases production costs

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