Method for reinforcing open-spandrel masonry arch bridge with corrugated steel plate hoop method

Abstract

The invention discloses a method for reinforcing an open-spandrel masonry arch bridge with a corrugated steel plate hoop method. The open-spandrel masonry arch bridge comprises an arch ring and an arch bridge foundation, wherein the arch ring is arranged on the arch bridge foundation, a spandrel cross wall is arranged on the arch ring, distributed reinforcing steel bars are arranged at the upper end of the arch ring, a mortar protection layer is arranged on the outer side of the distributed reinforcing steel bars, the distributed reinforcing steel bars comprise longitudinally distributed reinforcing steel bars and horizontally distributed reinforcing steel bars, a self-compaction concrete filling body is arranged on the bottom side of the arch ring, a corrugated steel plate is arranged onthe outer side of the self-compaction concrete filling body, and L-shaped distributed reinforcing steel bars are arranged at two ends of the inner wall of the corrugated steel plate and integrally welded and tightened with the corrugated steel plate and the distributed reinforcing steel bars to form a hoop tightened original masonry structure. The strength design value of a material is increased,stone weathering is prevented, the tolerance of the structure to non-uniform tensile stress is improved, limited brackets can be adopted for construction, and the construction progress is acceleratedwhile the measure expense is reduced.

Description

technical field [0001] The invention relates to a masonry arch bridge, in particular to a method for reinforcing an empty-bellied masonry arch bridge by adopting a steel corrugated plate hoop method. Background technique [0002] At present, the enlarged section method (referring to the traditional This method has the following disadvantages: the added structure has a lot of self-weight, the construction is difficult, and it is necessary to plant bars on the original masonry structure, which destroys the integrity of the original structure, and the space for improving the bearing capacity is limited. [0003] With the continuous development of urbanization and the increasing traffic demand of the people, the owners of many masonry arch bridges often require simultaneous widening and reconstruction during reinforcement, which requires that the reinforced structure not only bear the original design load, but also meet the new load The stress demand of the load puts forward hi...

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Problems solved by technology

[0002] At present, the enlarged section method (referring to the traditional This method has the following disadvantages: the added structure has a lot of self-weight, the construction is difficult, and it is necessary to plant bars on the original masonry structure, which destroys the integrity of the original structure, and the space for improving the bearing capacity is limited

This method has the following problems: 1. It is difficult to use the jacking method for construction; 2. The filling body adopts ordinary concrete and cannot reach the compact state required by the design; 3. It is difficult to implement the process of spraying mortar between the corrugated steel plate and the arch ring

This method has the following problems: 1. The jacking method is still used for construction. For the long-span masonry arch bridge with high clearance under the bridge, the construction difficulty is still relatively large; 2. The reinforcement of the steel corrugated plate is only for the lower edge of the original arch ring, but due to The arch ring of an empty belly masonry arch bridge is not as uniform as the arch ring of a solid belly masonry arch bridge. Due to the existence of concentrated force on the column on the arch, there will be tensile stress on the upper surface of the arch ring. The steel corrugated plate is used to strengthen the lower surface. 3. The strength of the masonry structure of the original masonry arch bridge has not been fully developed and utilized, and the stress on the upper surface is uneven, resulting in a limited increase in the bearing capacity of the reinforced bridge

This method is only applicable to solid-belly masonry arches, and cannot solve the problem of uneven stress on the arch rings of empty-belly masonry arch bridges and easy cracking on the upper surface of the arch rings

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