Method for reinforcing an arch bridge by spraying UHPC (Ultra High Performance Concrete) and planting steel bars

Abstract

The invention discloses a method for reinforcing an arch bridge by spraying UHPC (Ultra High Performance Concrete) and planting steel bars. The method comprises the following steps: (1) planting the steel bars on the side surfaces and the bottom surfaces of arch ribs of an arch ring; (2) spraying UHPC materials on the side surfaces and the bottom surfaces of the arch rings and the arch ribs at the positions where the steel bars are planted in the step (1) so as to form UHPC base layers; (3) after the UHPC foundation layer is stable, a reinforcing mesh being hung at the position where bar planting treatment is conducted; (4), the UHPC material being sprayed to the side faces of the arch ring and the arch rib and the bottom face of the arch ring and the arch rib again at the position where the steel bar planting treatment is conducted in the step 1 to form a UHPC reinforcing layer with the thickness being a second set value. The thickness of the reinforcing layer can be effectively reduced, meanwhile, the reinforcing procedure of the arch bridge is reduced, the construction speed is increased, and the engineering cost is reduced.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a method for reinforcing arch bridges by spraying UHPC and planting bars. Background technique [0002] Arch bridge is the most commonly used bridge type in China. It has the largest number of styles and is the crown of all bridge types, especially road bridges. According to incomplete statistics, 7% of China's road bridges are arch bridges. [0003] After the arch bridge is used for a long time, due to the erosion and corrosion of the river, the change of the external environment, the increase of the load, the weathering of the stone, etc., the damage to some areas of the arch bridge will be caused, which will lead to the decrease of the bearing capacity of the arch bridge. Therefore, we need to repair this part of the arch bridge. For reinforcement. [0004] In the prior art, when the arch bridge is reinforced, the main sample is the method of adding a reinforcemen...

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Problems solved by technology

[0005] In the above method of strengthening the arch bridge, the mechanical properties of the molded cast-in-place reinforced concrete reinforcement layer are relatively low, resulting in a large size of the reinforcement layer, and the new constant load has a large loss of bearing capacity. At the same time, due to the relatively low elastic modulus of ordinary concrete, it can be seen from the principle of stiffness distribution that the load shared by the newly added section is less, which is not conducive to the improvement of the overall bearing capacity of the arch bridge

[0006] However, the construction process of molded cast-in-place UHPC reinforcement layers is often cumbersome, requiring scaffolding and formwork, and the need to deal with the waters at the construction site. The construction speed is slow and the cost is high, and the reinforcement layer cannot be formed at one time and poured in batches. It will leave tiny construction gaps, which will have a great impact on its anti-seepage performance

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