A masonry arch bridge reinforcement structure and its construction method

Abstract

The invention discloses a reinforced structure of a masonry arch bridge, which comprises a foundation widened on both sides, an abutment widened on both sides and a reinforced arch ring composed of self-compacting concrete and a corrugated steel plate arch shell. The reinforced structure can greatly improve the bearing capacity of the diseased arch bridge, and the reinforcement operation has little effect on the mechanical properties of the existing arch ring. The invention also discloses a construction method for masonry arch bridge reinforcement structure, comprising the following steps: widening foundation construction; widening abutment construction; corrugated steel plate arch shell construction; sealing end plate construction; concrete filling body construction. In this construction method, corrugated steel plate arch shells are assembled in groups on the arched scaffolding and extended abutments, and are gradually placed in place through traction and movement, which can quickly and effectively realize the construction of masonry arch bridge reinforcement structures.

Description

technical field [0001] The invention belongs to the technical field of masonry arch bridge reinforcement, and in particular relates to a masonry arch bridge reinforcement structure and a construction method thereof. Background technique [0002] With the increase of the service life, under the erosion and corrosion of the river water, and the weathering of the external environment, a considerable number of masonry arch bridges have been damaged, such as the main arch ring and abdominal arch ring, resulting in a decrease in bearing capacity. At the same time, with the increase of the actual traffic load of the bridges in active service, a large number of old arch bridges can no longer meet the requirements of use, and need to increase the bearing capacity or repair and strengthen. [0003] In bridge engineering, stone arch bridge is a very old bridge type, and it is also one of the most important bridge types on provincial, county and township roads at the present stage. In ...

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Problems solved by technology

If ordinary concrete is poured on the lower edge of the original arch ring, since the generally thickened layer is relatively thin, the formwork is curved and the steel bars are curved, the concrete pumped in will fall vertically under the action of gravity and accumulate between the steel bars and the formwork, causing the concrete It cannot be poured in at all; even if it is poured in, there will be problems of insufficient bonding

After being vibrated by the vibrator, the concrete is still not dense, and a large amount of concrete is accumulated at the gate of the formwork, which is difficult to construct

[0008] 3. The method of adding reinforced concrete hoops around the arch ring can increase the bearing capacity by increasing the cross-sectional area, but due to the large concrete area, the newly added concrete will have a large self-weight; usually only the arch ring is set in sections to reduce the concrete Dosage, however, sectionally set will cause the abrupt section to become the weak point of the reinforced arch ring

The scheme has the following three problems: 1. The steel corrugated plate vault is pushed into place, which is difficult to implement; 2. As mentioned above, the compact state required by the design cannot be achieved by using ordinary concrete filling; 3. The steel corrugated plate arch The technology of spraying mortar in the gap between the bridge arch circle and the inner circumferential surface cannot be implemented at all

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