Fast constructed three-span continuous space special-shaped cable-stayed combined bridge and construction method

Abstract

The invention discloses a fast constructed three-span continuous space special-shaped cable-stayed combined bridge and a construction method. Technical and structurally innovation is carried out on acable-stayed bridge with the span being 120 m to 200 m and the ratio of the main span to the side span being (3-4):1, a steel cable rope of a conventional cable-stayed bridge is replaced with a cable-stayed rod part with a special 3D hollow steel pipe section, the rigidity of the cable-stayed rod part is increased to basically eliminate the sag influence of the original steel cable rope, the stress level is greatly reduced, the stress amplitude is reduced, and the anti-fatigue life and the service life of the bridge under repeated loads are prolonged. The number of needed cable-stayed components is greatly reduced, the indeterminate frequency is reduced, the construction process is simplified, and construction difficulty is reduced. A steel-concrete combined structure and a high-performance concrete bridge deck slab are adopted, therefore, the dead load of the bridge is reduced, main components can be machined and prefabricated in a factory, the site operation time is shortened, the construction progress is improved, and the negative influence on traffic is reduced. In addition, the bridge is novel in structure and has unique aesthetic value.

Description

technical field [0001] The invention relates to a rapid construction three-span continuous space special-shaped cable-stayed composite bridge and a construction method. Background technique [0002] The cable-stayed bridge type is more economical and has a large spanning capacity. In addition to good performance, it also has strong aesthetic value. The cable-stayed bridge has rich overall shape and connotation, and various structural forms, so it has broad application prospects in urban and highway bridge construction. [0003] Stay cables are a key component of cable-stayed bridges. [0004] At present, although the stay cables have made great progress in terms of material strength, cable form, fatigue resistance, anti-corrosion performance and supporting anchoring tools, they have gradually achieved standardization and standardization, and their quality has improved. However, since the stay cables are generally made of high-strength steel wires or high-strength steel str...

AI Technical Summary

Problems solved by technology

[0005] In addition, when live loads such as vehicles act on the middle span of the conventional cable-stayed bridge, due to the relatively soft stiffness of the bridge towers on both sides, the top of the bridge tower is easy to shift toward the main span, and the bending moment at the bottom of the tower increases , the main beam deflection is obvious

At the same time, the displacement of the tower top of the bridge tower makes the tension of the cable stays in the mid-span loose and decreases, and the tension of the cable stays in the side spans increases. When the live load acts on the side spans, the opposite is true. The value varies greatly, which is prone to fatigue problems

Generally, in the design of cable-stayed bridges, for the sake of safety, the stress amplitude and deformation caused by uneven load conditions should be checked for strength and fatigue resistance design, so that the design of bridge towers, cable-stayed cables and main girders computational complexity

In addition, the current cable-stayed bridges mostly use dense cable systems, which have the advantages of relatively uniform stress distribution, low girder height, large structural spanning capacity, and light weight. Many, difficult construction control, high risk, long construction period and susceptible to climate influence, etc., this type of dense cable system bridge is suitable for 300-500m prestressed concrete cable-stayed bridges and 500-1000m steel-concrete composite structures and steel cable-stayed bridges. It is more suitable to pull the bridge

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