Deck type open shoulder arch bridge and constructing method thereof

Abstract

The invention belongs to the bridge technical field and relates to a deck type open shoulder arch bridge. The deck type open shoulder arch bridge comprises a main arch ring 1, upper spandrel arches 2, a bearing platform 3 and a pile foundation 4, wherein the upper spandrel arches 2 are arranged on both sides of the main arch ring 1, and arch feet of the main arch ring 1 are arranged in the bearing platform 3. The deck type open shoulder arch bridge further comprises a plurality of prestressed concrete pull-pressing rods 5. A prestressed wire 6 penetrates through each prestressed concrete pull-pressing rod 5, and two ends of the prestressed wire 6 are respectively anchored in the bearing platform 3 which is on the same side of the prestressed wire 6. The main arch ring 1, the pile foundation 4 and the prestressed concrete pull-pressing rods 5 are connected to form a whole through the bearing platform 3. Meanwhile, the invention provides a constructing method of the deck type open shoulder arch bridge. Prestressed steel beams in the prestressed concrete pull-pressing rods 5 can be once tensioned in place in constructing process, and no construction passageway is need to leave to conduct tension step-by-step.

Description

technical field [0001] The invention belongs to the technical field of bridge structures, in particular to an upward-supporting arch bridge structure. Background technique [0002] The upward-supported arch bridge is an ancient and classic bridge type, with elegant and beautiful appearance. Its stress characteristics are: under the action of load, the arch feet generate horizontal thrust, which greatly reduces the bending moment of the main arch ring. It is suitable for geological conditions. area construction. In order to reduce the horizontal thrust of the arch foot, hollow arch bridges are often used, and the landscape effect of the structure is poor; a small number of arch bridges also adopt the open-shouldered arch structure in which the upper arch is arranged on the main arch circle. Considering the influence of the deformation of the arch foot, The upper abdominal arch of the arch generally adopts two-hinged arch or three-hinged arch, which has poor structural integr...

AI Technical Summary

Problems solved by technology

Generally speaking, there are few researches and applications of prestressing technology in top-through arch bridges, and the current engineering examples and research results all use flexible cables. Although protective measures such as epoxy coating or double-layer PE jacket are used for the cables, they still need to be replaced during the entire life cycle of the bridge. To ensure sufficient construction space, the backfill should be removed and backfilled after replacement; The second is that the construction is inconvenient. The flexible cables must be tensioned step by step with the construction loading of the upper structure. In order to ensure that there is space for tension, the construction passage must be reserved until the second phase of the dead load is completed.

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