Dismantling method of reinforced concrete continuous box girder overpass bridge

Abstract

The invention discloses a dismantling method for a reinforced concrete continuous box girder overpass bridge. The method comprises the steps that: a girder body is planned in a segmented mode, temporary supports are erected corresponding to piers, the bottom of the girder body is firstly lifted and cut, and a rear pier column is cut, dismantled and moved away, so that the girder body and the piers of a to-be-dismantled bridge are dismantled in a segmented manner; and after the girder body and the piers are dismantled, bridge abutment structures on the two sides and the dismantled bridge body and the dismantled piers are crushed, and building slag generated in the crushing process is conveyed to a roadbed fill for layered filling, so that the overall dismantling work of the bridge is completed. Longitudinal segmented planning is conducted on the girder body according to the number of the piers, temporary buttress is correspondingly arranged on the side, in the longitudinal bridge direction, of each pier for supporting in a matched mode, then segmented cutting, hoisting and transferring are conducted, and the purposes of reducing noise, reducing pollution and relieving disturbance to the surrounding environment are achieved; and construction consumables are reduced while construction safety is guaranteed, the construction cost is reduced, the whole dismantling construction is convenient and rapid, the construction period is shortened, and the social influence is reduced.

Description

technical field [0001] The invention relates to the technical field of bridge dismantling construction, in particular to a method for dismantling a reinforced concrete continuous box girder flyover bridge. Background technique [0002] With the rapid increase of urban traffic volume and traffic axle load, the service level of many expressways opened to traffic in the 1990s obviously lags behind the current economic development. In order to improve traffic capacity and better support the economy of surrounding areas In order to develop services, many expressways have begun to be rebuilt and expanded. In the process of expressway reconstruction and expansion construction, it is often encountered that flyovers are demolished to meet the needs of reconstruction and expansion. [0003] "Building bridges is easy, but dismantling bridges is difficult" has become a consensus in the industry. The related technologies of bridge construction have been mature, while bridge demolition is...

AI Technical Summary

Problems solved by technology

However, this dismantling method requires an additional bridge erecting machine, which will seriously prolong the construction period, and the erection of the bridge erecting machine requires strict conditions. The two ends of pedestrian bridges on expressways are mostly in special geographical environments such as hillsides or fields, which are difficult to meet the installation requirements of bridge erecting machines

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