Reinforcing method of masonry arch bridge

Abstract

The invention discloses a reinforcing method of a masonry arch bridge, which comprises the following steps of: a, planting ribs on an arch ring of the arch bridge along the cambered surface direction of the arch bridge; b, planting ribs at the position close to the two sides, on the circular arc surface of the arch ring along the cambered surface direction of the arch bridge; and c, forming symmetrically distributed reinforced concrete ribs along the distribution direction of the planted ribs in the step a and the step b in a way of casting molding, wherein the cross section of the reinforcedconcrete ribs is L-shaped. The reinforced concrete ribs which are of integral structures are formed along the two sides of the arch ring in the way of planting the ribs and casting concrete, then load can be directly transferred to an arch base through the symmetrically distributed reinforced concrete ribs of which the cross section is L-shaped, and the stress to the reinforced concrete ribs is equal to that to a ribbed arch bridge. When the method is compared with the method of singly increasing the area of the arch ring, the dependence on the primary arch ring is smaller, even the primary arch ring can be supported, the damage to the primary arch ring is small, the requirement of increasing the loading capacity of the masonry arch bridge is met, and the damage to the primary old arch ring is avoided to the maximal degree.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a method for reinforcing masonry arch bridges. Background technique [0002] With the passage of time, a considerable number of masonry arch bridges are currently damaged due to erosion and corrosion of river water, changes in the external environment, increased live loads, weathering of stone materials, etc. , or due to the need to increase the bearing capacity of existing arch bridges due to the increase in traffic requirements, a large number of masonry arch bridges need to repair and transform the main arch or abdominal arch to eliminate potential safety hazards. In the prior art, for the lack of bearing capacity of the main arch ring, there are reinforcements such as pasting steel plates or fiber cloth, or adding a certain thickness of reinforced concrete to the entire bridge width above or below the arch ring, or adding reinforced concrete hoops around the arch ring. met...

AI Technical Summary

Problems solved by technology

The effect of pasting steel plates or fiber cloth on arch rings mainly under compression is not obvious, and the surface weathering of stone arch rings obviously affects the joint work effect of steel plates or fiber cloth with original arch rings; the full bridge width above or below the arch rings Adding a certain thickness of reinforced concrete can increase the bearing capacity by enlarging the cross-sectional area, but the large-area planted reinforcement will seriously damage the integrity of the original stone arch ring, and the actual improvement of the bearing capacity needs to consider the reduction of the original stone arch ring due to the damage of the planted reinforcement

The method of adding reinforced concrete hoops around the arch ring can also increase the bearing capacity by increasing the cross-sectional area. However, due to the large concrete area, the newly added concrete produces a large self-weight, so usually only the arch ring is installed in sections to reduce the amount of concrete. , but the segmental setting will cause the sudden change section to become the weak point of the reinforced arch ring

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