Construction method of superlong cable beam-free sections of cable-stayed bridge

Abstract

The present invention relates to a construction method of superlong cable beam-free sections of a cable-stayed bridge. The first stage refers to the construction of five middle beam sections: the bracket+floating crane installation method is adopted, that is, the five cable beam-free sections in the middle of a tower area are sequentially hoisted up and placed on a lower beam bracket by using a floating crane, and tower beam temporary restraints are installed after the beams are connected into a whole. The second stage refers to the construction of two beam sections at the two ends: the platform+deck crane installation method is adopted, that is, the beam sections at each end are connected together on the backfield in advance and then stored on cofferdam top platforms on the both sides of a main tower, a deck crane above lifts and installs the beam sections, the lifting of the deck crane is conducted by using a midspan-and-then-sidespan asymmetry method, and the counterweight is increased or decreased in the construction process to decrease the unbalanced bending moment in the construction process. The construction method has unique advantages in terms of construction economy, construction cycle and construction safety, and the purpose of not applying floor steel pipe piles is realized.

Description

technical field [0001] The invention relates to a construction method of a cable-free beam section used in the construction process of a cable-stayed bridge, in particular to a construction method of an ultra-long cable-free beam section of a cable-stayed bridge. Background technique [0002] At present, no matter in foreign countries or in China, the construction of long-span cable-stayed bridges without cable beams adopts the floor support method, and with the increase of the length and installation height of the cable-free beam section, the floor support method has more advantages in terms of construction period, safety and economy. It shows its defects; when the bridge is located in areas such as poor foundation geological conditions and deep water levels, it is even impossible to build floor-to-ceiling steel pipe supports. [0003] Chongqing Mingshan Bridge is the first large-scale cable-stayed bridge built after water storage in the Three Gorges Reservoir area. The tot...

AI Technical Summary

Problems solved by technology

[0004] 1. The method is outdated and backward, and cannot adapt to the requirements of the length and installation height of the non-cable beam section;

[0005] 2. The erection period of the support is long, there are cross operations, the construction safety risk is high, and there are many unforeseen factors that are not conducive to the construction in terms of quality, safety and environmental protection;

[0006] 3. After the bracket is erected, it needs to be pre-pressed, which is time-consuming and consumable;

[0007] 4. The investment in bracket materials and marine machinery and equipment is huge

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