Quick changing method and system of expressway overline bridge

Abstract

The invention discloses a quick changing method and system of an expressway overline bridge. The quick changing method is suitable for dismantling, new construction and change of overbridges stretching over expressways and comprises the steps that S1, construction preparation is executed, wherein besides an existing roadbed nearby an original bridge, a construction site is arranged; S2, in the construction site, an integrated bridge upper-portion structure of one or more new bridges are formed through splicing; S3, a bridge lower-portion structure of each new bridge is arranged; S4, one or more integrated bridge upper-portion structures are moved to designed bridge positions and bridge setting is executed. The quick changing method has the advantages of being quick and having low traffic influence and the like and can be widely applied to the technical field of quick change and construction of overline bridges.

Description

technical field [0001] The invention relates to the technical field of rapid replacement construction of overpasses. More specifically, the present invention relates to a quick replacement method and replacement system for an expressway overpass. Background technique [0002] With the rise of expressway reconstruction and expansion projects, the problem of reconstruction and expansion of restricted road sections under complex conditions has become increasingly prominent. Among them, the problems of reconstruction and expansion of a large number of cross-line bridges, the problems of reconstruction and expansion of interconnected dense clusters, and how to match local road networks are the most prominent. Especially in the construction period under the condition of heavy traffic volume, there is a huge pressure to ensure traffic flow. For the demolition and reconstruction of over-line bridges in reconstruction and expansion projects, the existing methods mainly include: (1) ...

AI Technical Summary

Problems solved by technology

For the demolition and reconstruction of over-line bridges in reconstruction and expansion projects, the existing methods mainly include: (1) blasting method, which is only suitable for demolition, and is implemented after the expressway is completely closed. If it is less than 10 hours, it will have a great impact on the traffic of the expressway, and the approval procedure of the blasting method is complicated, and the safety and environmental protection control requirements are very high. For the flyover with complex layout of surrounding facilities, the blasting plan is not feasible, and there are many such flyovers. The traffic interruption caused by this method is bound to increase the traffic pressure on other road sections in the road network for a long time, which will not only affect economic development in the short term, but also bring huge negative social effects and potential safety hazards; (2) The bridge erecting machine method is only applicable Bridges with specific structural forms are difficult to adapt to flyover bridges with diverse bridge types, and the construction period is long, resulting in long-term operations above the operating expressway, which poses a great safety hazard. For expressway reconstruction and expansion projects with large traffic volumes, The technical solution of dismantling and rebuilding the overpass by the bridge erecting machine is unacceptable in terms of safety, construction period and traffic impact; (3) The crane method is generally implemented with a flatbed transport vehicle, limited by the capacity of the crane, and the main girder is a whole For the demolition construction of the type structure (continuous beam, box girder, etc.), it needs to be cut into smaller beam sections and removed in pieces. Not only the cutting workload is heavy, but also the door frame or full hall bracket needs to be arranged to support many small beam sections, which is a safety hazard. The protection puts forward extremely high requirements, and it is difficult to implement new bridge erection construction. Taking the simply supported beam overpass with piers in the central divider as an example, the installation time of the bridge span will not be less than 12 hours, and its follow-up construction still needs a long time on the operating expressway. Working above the highway has obvious potential safety hazards. For the reconstruction and expansion of existing expressways with increasing traffic volume, the technical solution of using cranes to install simply supported girder bridges in pieces has gradually become unacceptable in terms of construction period and traffic impact.

Images