Method for dismantling concrete box girder of under-passing closed frame culvert

Abstract

The invention discloses a method for dismantling a concrete box girder of an under-passing closed frame culvert. The method for dismantling the concrete box girder of the under-passing closed frame culvert comprises the following steps of early-stage preparations, erecting full framing, erecting steel pipe column structures, laying a gantry crane track beam, installing a gantry crane, cutting mainbeam flange plates by adopting a rope saw, eliminating discarded flange plate blocks through hoisting by adopting the combination of the gantry crane and a truck-mounted crane, cutting a main beam box chamber by adopting the rope saw, eliminating discarded main beam box chamber beam blocks through hoisting by adopting the combination of the gantry crane and the truck-mounted crane, and transporting the discarded beam blocks to a designated site by adopting a transportation truck. According to the method for dismantling the concrete box girder of the under-passing closed frame culvert, throughthe design of a temporary support and the cutting steps, the concrete box girder is dismantled by adopting the combination of the truck-mounted crane and the gantry crane; safe and rapid dismantlingof a bridge is achieved; and the method is applicable to rapid dismantling construction of the concrete box girder of the under-passing closed frame culvert in a city bridge.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a method for removing a concrete box girder passing through a closed frame culvert with an understructure retained. Background technique [0002] With the continuous development of my country's urban construction scale, the problem of traffic congestion is becoming more and more serious. Bridge upgrading and reconstruction is one of the effective methods to relieve traffic pressure at present and in the future. With the increase of bridge service time and the continuous increase of vehicle load, some bridges inevitably need different degrees of maintenance, reinforcement or reconstruction. [0003] Chinese patent 201811041776.2 discloses a construction method for dismantling the superstructure of a cross-line single-box multi-chamber cast-in-place reinforced concrete bridge, including the following steps: enclosing and sealing the perimeter of the bridge to protect th...

AI Technical Summary

Problems solved by technology

The cast-in-place concrete box girder passing through the closed frame culvert is a form of urban bridge. There is no mature experience for the replacement of the main girder of this type of bridge to learn from. The traditional beam removal method will cause a huge safety hazard to the normal use of the closed frame culvert.

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