Reinforced Concrete Continuous Rigid Frame Bridge Compositely Reinforced by Tension Surface and Its Construction Method

Abstract

The invention discloses a tension face layer compound-reinforced reinforced concrete continuous rigid frame bridge and a construction method thereof. The continuous rigid frame bridge comprises a bridge pier, an abutment, a reinforced concrete girder and a bridge floor. The pier top hogging moment section of the girder is of a box-shaped section beam structure, a sagging moment section of the girder is of an n-shaped section beam structure, the bottom surface of a sagging moment section beam rib is provided with a steel plate reinforcement layer fixedly connected to a stirrup, and the girder is formed by pouring composite concrete evenly doped with a flexible material. The tension face layer compound-reinforced reinforced concrete continuous rigid frame bridge is simple to construct and clear in stress, can meet the requirements of crack resistance and crack stopping needed for durability of the concrete bridge, and is suitable for being applied to bent, sloping and inclined concrete continuous rigid frame bridges of medium and small spans where concrete tension and cracking cannot be overcome by pre-stressed strand arrangement easily.

Description

technical field [0001] The invention relates to a bridge and a construction method thereof, in particular to a reinforced concrete continuous rigid frame bridge with composite reinforced tension surface layers and a construction method thereof. Background technique [0002] For curved, sloped and oblique continuous rigid frame bridges with large longitudinal slopes and small radius flat curves in some areas with medium and small spans, in order to avoid corrosion of steel bars caused by tensile cracking of concrete structures, prestressing is usually used in conventional designs. To counteract the tensile stress of the bridge under load, due to the complex spatial mechanical behavior of curved, slope, and oblique continuous rigid-frame bridges with medium and small spans, it is necessary to use flat, vertical, and horizontal three-dimensional curved spatial prestressed beams or long and short prestressed beams. In the complex prestressed beam distribution system combined wit...

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Problems solved by technology

[0002] For curved, sloped and oblique continuous rigid frame bridges with large longitudinal slopes and small radius flat curves in some areas with medium and small spans, in order to avoid corrosion of steel bars caused by tensile cracking of concrete structures, prestressing is usually used in conventional designs. To counteract the tensile stress of the bridge under load, due to the complex spatial mechanical behavior of curved, slope, and oblique continuous rigid-frame bridges with medium and small spans, it is necessary to use flat, vertical, and horizontal three-dimensional curved spatial prestressed beams or long and short prestressed beams. In the complex prestressed beam distribution system combined with stress beams, especially in mountainous areas with weak construction technology, there are often obvious differences between the stress distribution of the bridge obtained in actual construction and the designed ideal structure, resulting in unexpected deformation and cracking of the bridge

Especially the existence of cracks on the top surface of the bridge slab in the negative bending moment section of the main girder. The main reinforcement of the bending moment plays a direct corrosion role, and the sensitivity of the prestressed steel wire to crack corrosion will make the bridge have a hidden danger of durability

It is difficult for the construction team to build this kind of non-major bridge in the mountainous area where the bridge construction conditions and technical strength are very limited to meet such high construction technical requirements, and it is easy to cause obvious differences between the actual bridge and the designed ideal bridge, which will lead to hidden dangers of bridge diseases in the later stage

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