Composite Cantilever Formwork Support System and Construction Method of Cast-in-place Cover Beam for High Pier

Abstract

The invention relates to a composite cantilever supporting formwork system for a high-pier cast-in-situ capping beam, comprising a foundation, a bearing platform, a toothed plate steel cylinder, a steel pipe center pillar, an assembled section steel bracket and a capping beam formwork system, wherein the toothed plate steel cylinder is pre-embedded at a lower part of the bearing platform; the lower part of the bearing platform is provided with a steel cylinder perforated expansion bottom plate; the steel cylinder perforated expansion bottom plate and a connection annular plate are fixed together through a bottom plate connection bolt rod; an upper part of the toothed plate steel cylinder is fixed through a steel cylinder slantwise fixed rib; the periphery of the toothed plate steel cylinder is provided with backfilling gravels; a steel pipe center pillar connecting bottom plate and a steel pipe center pillar fixing sleeve are pre-embedded in the bearing platform. The composite cantilever supporting formwork system for the high-pier cast-in-situ capping beam has the beneficial effect that an assembled vertical pillar foundation is adopted, a connection steel protection cylinder is pre-embedded below the bearing platform, the connection annular plate is pre-embedded below the steel cylinder, the periphery of the annular plate is provided with male pins; the male pins are insertedinto the gravels; the steel cylinder perforated expansion bottom plate and the annular plate are connected together through the connection bolt rod; an obtrusive toothed plate is disposed outside thesteel cylinder so as to increase building-in with the gravels.

Description

technical field [0001] The invention relates to a composite cantilevered formwork support system and a construction method of a cast-in-place cover beam for a high pier, and is mainly suitable for the construction of a cantilever cover beam on the upper part of a bridge pier. Background technique [0002] At present, in the construction of bridge cover beams, there are many types of stress systems, such as steel beam method, bracket method, pre-embedded steel plate welding triangular steel support method, hoop method, etc. When the cantilever of the cover beam is relatively long, the support method is the first choice in construction. There are two commonly used support stress systems: floor fastener type full hall scaffolding and portal type steel pipe scaffolding (bracket). [0003] When the construction area is located in an urban area with a large flow of people and vehicles, the construction process must ensure normal traffic operation, and the traditional construction ...

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Problems solved by technology

[0003] When the construction area is located in an urban area with a large flow of people and vehicles, the construction process must ensure normal traffic operation, and the traditional construction of full hall support cannot meet the requirements

[0004] The commonly used support system adopts portal-type steel pipe scaffolding and hoop suspension frame. The force of portal-type steel pipe scaffolding is clear and the technology is mature, but the construction speed is slow, the construction period is long, it requires a lot of labor, and there are great quality and safety hazards; the hoop suspension The cantilever uses the existing pier foundation as the stress foundation, which saves the time for re-pouring the foundation; the stress columns are arranged in parallel with the viaduct pier, which reduces the occupation of the road for vehicles and pedestrians, and relieves the traffic pressure caused by the construction. However, the cantilever structure system Risk of stability in case of high piers

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