A kind of middle and small span old bridge reinforcement and split width structure and its construction method

Abstract

The invention discloses a medium-small span old bridge reinforcement and jointing-widening structure. The medium-small span old bridge reinforcement and jointing-widening structure comprises a reinforcement structure located below an old bridge and a jointing-widening structure located at at least one side of the old bridge. The reinforcement structure comprises a pair of reinforcement pile foundations arranged at the two sides of the old bridge span. Steel plates are erected between the pair of reinforcement pile foundations along the bridge bottom face to form a reinforcement bridge floor in a jointed mode. A hollow cavity is formed between the reinforcement bridge floor and the bottom face of the old bridge and filled with concrete. The jointing-widening structure comprises a pair of jointing-widening pile foundations arranged at the two ends of the old bridge span and at least one sides of the reinforcement pile foundations correspondingly. Steel plates are erected between the pair of jointing-widening pile foundations to form a jointing-widening bridge floor in a jointed mode, and the jointing-widening bridge floor is adjacent to the reinforcement bridge floor and identical to the reinforcement bridge floor in radian. A reinforcement plate is arranged on the jointing-widening bridge floor. A hollow cavity is formed between the reinforcement plate and the jointing-widening bridge floor and filled with concrete. Backfill is arranged on the jointing-widening bridge floor and reinforcement plate to be flush with the old bridge floor. According to the medium-small span old bridge reinforcement and jointing-widening structure, the existing bridge is reinforced and widened through the reinforcement structure and the jointing-widening structure, and the problem caused by dismantling and rebuilding of the old bride is avoided.

Description

technical field [0001] The invention discloses a highway traffic facility technology, and in particular relates to a reinforcement and widening structure of an old bridge with a small and medium span and a construction method thereof. Background technique [0002] With the increasing development of the national economy, new requirements are put forward for transportation infrastructure, such as reinforcement of old bridges that cannot continue to carry the load, and bridges that need to be widened to improve road service levels. As far as dangerous bridges with small and medium spans are concerned, the conventional solution is demolition and reconstruction. The main disadvantages are: (1) There are a large number of abandoned projects after the old bridges are demolished. If they are not utilized, the ecological environment will be affected; Larger, the original road needs to be rerouted or the traffic is temporarily interrupted, and the social impact is relatively poor. For...

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Problems solved by technology

As far as dangerous bridges with small and medium spans are concerned, the conventional solution is demolition and reconstruction. The main disadvantages are: (1) There are a large number of abandoned projects after the old bridges are demolished. If they are not utilized, the ecological environment will be affected; Larger, the original road needs to be rerouted or the traffic is temporarily interrupted, the social impact is poor, and the impact is more significant for the interchange project; (3) After the old bridge is demolished, a new bridge needs to be built on the original site, and the cost is relatively high

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