Fabricated steel-ultrahigh toughness concrete combined bridge deck

Abstract

The invention discloses a fabricated steel-ultrahigh-toughness concrete combined bridge deck which comprises hot-rolled H-shaped steel, round steel bars, high-strength bolts and ultrahigh-toughness concrete. Bolt holes are formed in flanges of the hot-rolled H-shaped steel, and transverse round steel bars are welded to flange plates on the flanges, so that the section steel prefabricated part units are formed. The high-strength bolts penetrate through the bolt holes and are connected with the adjacent hot-rolled H-shaped steel to form a bridge deck steel framework. The ultrahigh-toughness concrete is poured on the bridge deck steel framework to play a role in protecting the bridge deck steel framework. In the combined bridge deck slab system, the ultra-high toughness concrete can ensure that micro cracks of 100 microns or below are not generated or only generated, and the toughness and durability of the structure are improved; the bridge deck steel framework is formed by connecting factory prefabricated parts through the high-strength bolts, the prefabrication and assembly degree is high, and the construction precision and quality are guaranteed; and no stud needs to be arranged, so that the construction complexity is reduced, and the structural fatigue performance is ensured.

Description

technical field [0001] The invention relates to the technical field of structural engineering, in particular to an assembled steel-ultrahigh toughness concrete composite bridge deck. Background technique [0002] With the continuous advancement of my country's infrastructure construction process, people realize that the convenience of intra-city traffic and inter-city traffic greatly affects the development of the national economy and social progress; therefore, the country has achieved great development in road and bridge engineering in recent decades . Among them, bridge structures are not only widely used in urban overpasses, subway light rails, high-speed railways, etc., but also in river-crossing and sea-crossing structures. In recent years, with the construction of super-large bridge projects such as the Hong Kong-Zhuhai-Macao Bridge and the Hangzhou Bay Bridge, bridge structures at home and abroad are facing unprecedented opportunities for development. In the constru...

AI Technical Summary

Problems solved by technology

However, there are still some problems in the existing steel-concrete composite bridge deck: First, in order to ensure the sufficient shear connection between steel and concrete and prevent the detachment of the two interfaces, more bolts are usually arranged between the two Nails (playing the dual role of shear resistance and pull resistance), which greatly increases the construction workload, and the fatigue performance of the structure is affected due to the existence of welds; second, the steel deck part of the composite bridge deck usually needs to be welded out of the plane Multiple stiffeners, which also increase the amount of construction and affect the fatigue performance of the structure; third, ordinary concrete materials are prone to cracking under tension, and are sensitive to local defects, and are prone to cracks under long-term loads, causing water and ion erosion, affecting The corrosion resistance and durability of the bridge deck will significantly increase the repair and maintenance costs of the bridge structure, causing a huge waste of manpower and material resources; fourth, the steel structure part of the existing composite bridge deck system is usually welded on the construction site. The on-site workload is heavy and the construction quality and precision are difficult to guarantee

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