Steel arch rib outer wrapped concrete construction method for steel trussed arch bridge

Abstract

The invention discloses a steel arch rib outer wrapped concrete construction method for a steel trussed arch bridge and relates to the technical field of building construction of steel trussed arch bridges. The construction method includes the steps that each steel arch rib section to be poured with concrete is provided with a hanging bracket system and a bottom formwork; after installation is finished, bottom board reinforcing steel bars are tied; each hanging bracket system is used for erecting a construction support and an operation platform, web reinforcing steel bars and a web formwork of a first ring construction section are installed, and the outer wrapped concrete is poured to the first ring construction section; after the concrete is poured, an inner cavity support and a platform are erected, a high construction support and an operation platform are connected, reinforcing steel bars and a formwork of a second ring construction section are installed, and the outer wrapped concrete is poured to the second ring construction section; and after the concrete is poured, outer wrapped concrete construction of the next steel arch rib section is started, and the operation is repeated till the concrete is poured to all the steel arch rib sections. By the adoption of the method, the construction difficulty is lowered, the application range is wide, construction efficiency is effectively improved, construction safety is guaranteed, and adaptability and economical efficiency are high.

Description

technical field [0001] The invention relates to the technical field of construction of steel truss-arch bridges, in particular to a construction method for steel arch ribs wrapped in concrete for steel truss-arch bridges. Background technique [0002] As one of the structural forms of long-span bridges, steel truss-arch bridges have been used more and more because of their various forms and large applicable spans. At present, in the construction process of steel truss arch bridges, in order to reduce the cost of steel truss arch bridges and make them economical and applicable, more and more steel truss arch bridges use steel arch ribs as the stiff skeleton, and outsourced concrete to form a steel-concrete bridge. Combine arch ribs. This kind of steel-concrete combined arch rib not only gives full play to the role of the steel structure, but also effectively reduces the construction cost, which has been widely recognized by the industry. [0003] However, in practical appli...

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Problems solved by technology

[0003] However, in practical application, due to the influence of various factors such as the slope, size, and operating space of the steel arch rib, the construction of the outsourced concrete is very difficult and the quality of the concrete construction is difficult to control.

Moreover, the existing support erection method can only be used in the general situation with good terrain conditions, and cannot be erected at all for situations such as mountainous valleys or crossing rivers, and the scope of application is narrow; in addition, the erection process of the support is complicated and difficult to use Time variability, poor construction safety

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