A large plate beam structure and strengthening method of power plant boiler with external prestressed integral reinforcement

Abstract

The invention provides an external prestressing overall reinforcement power station boiler large plate beam structure and a reinforcement method thereof. The large plate beam structure comprises a power station boiler large plate beam, anchor boxes, supporting beams, prestressed pull cables, hanging rods, connecting beams and the like. The supporting beams comprise vertical supporting beam bodies and horizontal supporting beam bodies, and the vertical supporting beam bodies and horizontal supporting beam bodies are connected through cover plates by adopting high-strength bolts; the horizontal supporting beam bodies make contact with the lower edges of lower flanges through cushion plates; the supporting beams are connected through the connecting beams to form a combined member; and the pull cables are symmetrically arranged on the two sides of a web of the large plate beam and directly or indirectly connected with the supporting beams through the hanging rods by adopting cable clamps. In order to reduce the prestress loss in the pull cables, arc-shaped rotation devices can be arranged between the hanging rods and vertical supporting beam top plates to enable the hanging rods to rotate by small angles; and through external prestressing overall reinforcement of the boiler large plate beam, the large plate beam lower flange tensile stress is reduced, the internal force state of the large plate beam structure is optimized, and surface crack propagation at a lower flange splicing weld seam is effectively inhibited.

Description

technical field [0001] The invention belongs to the technical field of boiler steel structures in prestressed structural engineering, and in particular relates to a large plate girder structure of a power station boiler integrally reinforced by external prestressed forces and a strengthening method thereof. Background technique [0002] The large plate beam is the main load-bearing member in the steel structure system of the power plant boiler, which mainly bears the vertical boiler load and transmits it to the end support column. The major slab beams are parallel to each other and connected by multiple beams. Large slab girders bear a large load, and their cross-sectional dimensions and spans are different from conventional steel structures. Large slab girders are mostly I-shaped cross-sections, and the splicing method of layering along the height and segmenting along the length is usually used in the design process. Under the boiler load, the upper flange of the I-shaped...

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Problems solved by technology

[0004] At present, my country's boiler steel structure design code has not yet made detailed regulations on the reinforcement technology of large plate girder steel structures.

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