Method for constructing continuous U-shaped beams

Abstract

The invention discloses a method for constructing continuous U-shaped beams, which comprises the following steps: pouring simply-supported U-shaped beams required for maintenance, reserving plain-bar and prestressed-tendon pipes at the ends of the simply-supported beams, and meeting the stress requirements of the simply-supported beams in the processes of simple supporting and hoisting, after the simply-supported beams meet the installation requirements, transporting the simply-supported beams to the construction site, then hoisting the integral simply-supported beams to the right places by adopting a temporary pedestal, and reserving an operating joint between each two U-shaped beams; stretching a capping hogging-moment prestressed tendon in the operating joint between each two simply-supported U-shaped beams, and connecting a wet joint with the operating seam; and after the wet joint reaches a required strength, removing the temporary pedestal and setting up a permanent pedestal, so that the original simply-supported beams are changed into stressed continuous beams. Compared with the prior art, compared with a simply-supported beam bridge with a same span, a simply-supported beam bridge adopted firstly and a continuous U-shaped beam bridge adopted sequentially in the invention can reduce the span moment, thereby saving the application amounts of steel and concrete, and obtaining the application performance as same as that of the continuous beam bridge under the condition that the technical difficulty is not high and the construction period is short, therefore, the economic benefits and social benefits of the method disclosed by the invention are extremely considerable.

Description

technical field [0001] The invention is suitable for the construction of U-shaped beams used for bridge construction in the traffic field. Background technique [0002] At present, in the field of bridge engineering, especially in the field of urban rail transit, the building height of bridges is often restricted by various factors. U-shaped beams use the bottom plate connecting the webs on both sides to bear the load, which can greatly reduce the building height of the beam body. Solve a series of problems such as insufficient bridge clearance and limited building height. [0003] The existing U-shaped beam mainly adopts the scheme of simply supported beam, which has the advantages of fast construction speed and high beam quality, and can be constructed in a modular manner. The disadvantage is that the mid-span bending moment is large and the utilization rate of the beam section is not high. Later, the continuous beam scheme was adopted in some areas, and the construction ...

AI Technical Summary

Problems solved by technology

[0003] The existing U-shaped beam mainly adopts the scheme of simply supported beam, which has the advantages of fast construction speed and high beam quality, and can be constructed in a modular manner. The disadvantage is that the mid-span bending moment is large and the utilization rate of the beam body section is not high

Later, the continuous beam scheme was adopted in some areas, and the construction method of in-situ pouring can solve the shortcomings of the simply supported beam scheme, followed by problems such as long construction period and insufficient quality assurance of in-situ pouring concrete.

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