Process for reinforcing double arch bridge by replacing ridged main arch ring section with box section

Abstract

The invention relates to a method of replacing ribbed main arch ring sections with box sections for reinforcing double arch bridges. The method comprises the following steps that: anchor steel bars are embedded in arch ribs of a ribbed main arch ring of a double arch bridge; a reinforcement mat is hung on the anchor steel bars; a template is arranged under the reinforcement mat; reinforced concrete plates with the thickness between 12 and 15 cm are cast in situ on full span of the hemline of the arch ribs in the transverse bridge direction, so as to ensure that the section form of the ribbed main arch ring is changed from an independent split multi-rib section into an integral single-box multi-chamber section. The method has the following advantages that: 1. the bearing capacity of the bridge is greatly improved at the same time when the integrity and rigidity of the main arch ring are improved; 2. the situation that the ribs of the prior main arch ring are under split stress is changed, and the ribs form an integral section to be under joint stress; meanwhile, uneven stress, inconsonant deformation and caused diseases among the arch ribs are eliminated; 3. the occupancy of natural resources and economic resources brought by abandonment, demolishment and reconstruction is saved; 4. the pollution on the natural environment brought by abandonment and old bridge demolishment is avoided.

Description

technical field [0001] The invention relates to a bridge reinforcement method, in particular to a method for reinforcing a double-curved arch bridge with a box-shaped section instead of a rib-shaped main arch ring section. Background technique [0002] The double-curved arch bridge is still a unique bridge type in my country, which has the flavor and characteristics of the Chinese nation. Because the bridge type has the characteristics of beautiful appearance, low cost and simple construction technology, a large number of bridges were built in my country in the 1960s and 1980s. The structural form of the bridge is to meet the needs of the transportation industry. The bridge type is generally composed of hollow arch structures (including belly arch piers, belly arch rings, solid belly sections and deck systems), rib-shaped main arch rings, substructures (piers, abutments) and protective structures, etc. Because of its ① the overall force condition is relatively complex; ② the...

AI Technical Summary

Problems solved by technology

The bridge type is generally composed of hollow arch structures (including belly arch piers, belly arch rings, solid belly sections and deck systems), rib-shaped main arch rings, substructures (piers, abutments) and protective structures, etc. Because of its ① the overall force condition is relatively complex; ② the longitudinal stiffness of the rib-shaped main arch ring is poor, and the transverse integrity is insufficient; ③ the overall deformation coordination is poor; ④ the joint surface between the arch rib and the arch wave plate of the rib-shaped main Small size, complex cross-section stress, and poor integrity; ⑤ Insufficient overall stiffness of the lateral connection and insufficient stiffness of the arch rib itself against lateral thrust

As a result, the bridge type suffered from various degrees of disease after several years of operation, and there were serious safety hazards. The occupation of natural and social resources is relatively large, and the pollution of waste to the environment is also relatively large

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