Locally uncombined suspension bridge steel-concrete combined bridge deck system and construction method of combined bridge deck system

Abstract

The invention discloses a locally uncombined suspension bridge steel-concrete combined bridge deck system and a construction method of the combined bridge deck system, and belongs to the technical field of bridge structures. The bridge deck system consists of concrete slabs, longitudinal steel beams, cross steel beams, air nozzles and toggle pin connectors; and a suspension bridge section steel-concrete combined bridge deck system is prefabricated in a factory. The prefabricated concrete slabs and section steel main beams form a whole through concrete wet joints and the toggle pin connectors.The prefabricated concrete slabs and cast-in-place concrete joints are only connected with the cross steel beams to form a whole through the toggle pin connectors, the longitudinal steel beams are not provided with the toggle pin connectors, and meanwhile, the toggle pin connectors are not arranged in a certain area of the ends of the cross steel beams at hoisting points. The problems of cracking, complex structures of toothed grooves at the slab ends of the prefabricated concrete slabs and the like due to the factors of temperature, contraction, creep and the like of the concrete slabs of the traditional suspension bridge combined bridge deck system are solved by adopting a locally uncombined technology on the premise of keeping the consumption of steel, the manufacturing process of the prefabricated slabs is simplified, the bearing capacity, the rigidity and the cracking resistance of the structure are improved, and the durability of the structure is improved.

Description

technical field [0001] The invention relates to a bridge deck system applicable to highway long-span composite girder suspension bridges, belonging to the technical field of bridge structures. Background technique [0002] Traditional suspension bridge steel-concrete composite deck system, such as figure 1 As shown, it consists of a steel longitudinal beam 1, a steel beam 2, an air nozzle 3, a stud connector 4, a prefabricated concrete slab 11 and a cast-in-place concrete joint 6. The segmental steel main girder structure is transported to the construction site for hoisting and positioning after welding at the factory. The plate end of the precast concrete slab 11 must be made into a toothed notch, and there are problems such as site workload and construction difficulty. At the same time, the precast concrete slab 11 and the cast-in-place concrete joint 6 are difficult to guarantee the quality of concrete pouring due to the narrow pouring space. Affect the mechanical perfo...

AI Technical Summary

Problems solved by technology

The plate end of the precast concrete slab 11 must be made into a tooth-shaped notch, which has problems such as large amount of on-site work and difficulty in construction. At the same time, the precast concrete slab 11 and the cast-in-place concrete joint 6 are difficult to guarantee the quality of concrete pouring due to the narrow pouring space. Affect the mechanical performance of the joint between new and old concrete

On the other hand, the steel-concrete composite deck system of a traditional suspension bridge is equipped with stud connectors 4 above the steel longitudinal girder 1 and the steel cross girder 2, and the steel longitudinal girder 1 can resist the forced deformation of the concrete slab due to the effects of temperature, shrinkage and creep, etc. It has obvious restraint effect, especially in the concrete slab at the hanging point, due to the installation of stud connectors 4, it leads to significant stress concentration, which is very easy to cause cracking of the concrete slab, thereby reducing the bearing capacity and stiffness of the structure, and affecting the durability of the structure

These problems have caused certain difficulties to the popularization and application of this type of structure.

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