High-pier long-cantilever cast-in-situ cover beam combined-type formwork system and construction method

Abstract

The invention provides a high-pier long-cantilever cast-in-situ beam combined-type formwork system and construction method. The high-pier long-cantilever cast-in-situ beam combined-type formwork system mainly structurally comprises a bearing platform, an inverted-trough type steel plate, a shock-insulation piece, rubber plugs, a bridge pier, a cover beam, spacing boards, anchor bolts, middle support column pedestal locking screws, middle support columns, horizontal connecting rods, inter-column bracings, hinged shafts, middle diagonal bars, a protective screen, a bailey beam, base plates, jacks, short studs, adjustable jack supports, a cover beam template, edge support columns, prefabricate strip foundations, embedded screw sleeves, edge support column pedestal fixing screws and a support beam. The main construction steps include 1), protective construction of the bearing platform; 2) setting up of the middle support columns; 3), setting up of the support beam; 4), installation of the bailey beam; 5), setting up of the edge support columns; 6), installation of the cover beam template; 7), pavement of a drainage ditch; 8), casting of the cover beam. The construction method has the advantages that the formwork system is high in stiffness, effect on road traffic running is low, drainage effectiveness is obvious during construction, and good economic and technical benefits is achieved.

Description

technical field [0001] The invention relates to 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 of full hall support cannot meet the requirements. [0004] In view of this, the commonly used support system adopts portal-type steel pipe scaffold...

AI Technical Summary

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] In view of this, the commonly used support system adopts portal-type steel pipe scaffolding and hoop cantilever 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 frame uses the existing pier foundation as the stress foundation, which saves the time for re-pouring the foundation; the stress column is 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 construction. Cantilevered structural systems are at risk of stability in case of high piers

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