Novel reinforcement method for two-way curved arch bridge

Abstract

The invention discloses a novel reinforcement method for a two-way curved arch bridge comprising the following steps: (1) closing to traffic on a bridge deck, dismantling the bridge deck and auxiliary facilities of the bridge deck and removing fillings on arches; (2) cutting rectangular grooves along the two-way curved arch bridge on the top of an extrados corresponding to an original arch rib; (3) chipping the bottom of the rectangular grooves, planting anti-shear reinforcement bars, erecting a formwork on the extrados on the top of the rectangular grooves, assembling the anti-shear reinforcement bars and pouring concrete to form new arch ribs, of which the height is same relative to the extrados, protruding from the extrados; (4) repairing transverse walls, chipping the sections, which are at the outer side of the transverse walls along the two-way curved arch bridge, of the extrados and the new arch ribs, planting reinforcement bars on the extrados and the new arch ribs which are chipped, erecting the formwork and pouring the concrete; (5) chipping the top of the transverse walls, planting vertical reinforcement bars and erecting new columns for supporting the bridge deck; (6) newly building the bridge deck. The novel reinforcement method for the two-way curved arch bridge has the advantages of being small in dead weight of a bridge structure, good in unity of an old structure and a new structure, low in reinforcement cost, good in adaptability, not restricted by surroundings under the two-way curved arch bridge, unchanged about the original appearance of the two-way curved arch bridge, good in operability and good in application prospect.

Description

technical field [0001] The invention relates to the technical field of bridge maintenance and reinforcement, in particular to a novel reinforcement method for double-curved arch bridges. Background technique [0002] The double-curved arch bridge is an original structural form in our country. It was mostly built in the 1970s and 1980s. It is generally composed of the main arch circle and the buildings on the arch. figure 1 shown. The main arch ring is composed of several parts such as arch ribs, arch waves, arch back or arch slabs, and horizontal connections. Arch structures are generally composed of transverse walls or columns, abdominal arch rings, arch fillers, and bridge deck systems. , because its shape is arc-shaped in both vertical and horizontal directions, it is called a double-curved arch bridge. The specific structure is as follows: figure 1 shown. [0003] Due to the characteristics of material saving, low cost, simple construction and beautiful appearance, th...

AI Technical Summary

Problems solved by technology

The method of this patent can greatly enhance the structural strength of the entire main arch ring, but this reinforcement method has two shortcomings: one is that the newly added concrete is too heavy, which increases the load-bearing burden of the main arch ring, and the original There are many diseases in the main arch ring itself, which may cause secondary damage to the original main arch ring and its substructure; second, the construction process is complicated, the material consumption is large, and the reinforcement cost is high

The above two reinforcement methods derived from the method of increasing the cross-section of the arched back have two shortcomings. One is that the self-weight of the newly added concrete mentioned above is too large, which increases the load-bearing burden of the old bridge; After the structure is cracked, the shear stress of the old and new concrete joint surface is mainly borne by the passive shear friction force generated by the shear reinforcement passing through the joint surface. The shear resistance capacity of the joint surface is limited, and it is easy to cause cross-bridge slippage or misalignment

[0007] It can be seen that there are three main problems in the reinforcement of double-curved arch bridges at this stage: first, how to reduce the self-weight of newly added concrete, that is, the self-weight of newly added concrete in general reinforcement methods is too large, which increases the load-bearing burden of the old bridge and cannot be maximized to improve the bearing capacity of the bridge; secondly, how to maximize the shear capacity of the joint surface of old and new concrete, so as to more effectively improve the integrity of the reinforced structure and ensure the effective transfer of stress at the joint surface; thirdly, how to simplify construction process, reduce the cost of reinforcement, in order to obtain the maximum economic benefit with the minimum cost

At present, there is no effective reinforcement method to solve these three major problems

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