External prestressing reinforced concrete framework beam structure and construction method

Abstract

The invention provides an external prestressed reinforced concrete framework beam structure and a construction method thereof, which belong to the technical field of construction engineering. The structure comprises at least two groups of external prestressed tedons, a tension end structure, a fixed end structure and a steering apparatus. The tension end structure is located below the bottom of amiddle beam of each span of the framework-crossing beam, each group of the external prestressed tedons pernerates through the tension end structure in the middle of a span after being directionally changed by the respective steering apparatus, and the tension end structure adopts an annular anchorage device to join and stretch the two groups of external prestressed tedons; and the tension end structure is only arranged below the bottom of the middle beam of each span of the framework beam, so that the number of the tension end structure can be effectively reduced. In addition, the tension endstructure is arranged below the bottom of each span of the framework beam, so that not only can the occupation of an application space on a floor or a roof be avoided, but also when in the external prestressing installation construction, a floor slab or a roof slab does not need to be perforated; and moreover, when the external prestressed tedon is loosened when in use, the prestressed tedon can be subjected to supplementary tension or replacement.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to an external prestressed reinforced concrete frame beam structure and a construction method thereof. Background technique [0002] The prestressed tendons are arranged inside the concrete beams, that is, conventional prestressing, and those arranged outside the concrete beams, that is, external prestressing. External prestressed reinforcement is a method of strengthening structural members or structures as a whole by adding external prestressed tendons. It is characterized by changing the internal force distribution of the original structure and reducing the stress level of the original structure by applying prestressing means, eliminating the uniqueness of the general reinforced structure. Stress and strain hysteresis, so that the post-added part and the original structure can work together better, and the overall bearing capacity of the structure can be signific...

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Problems solved by technology

[0004] 1) The prestressed tension end needs to be set above the floor slab or roof slab, which will affect the normal function of the building after reinforcement;

[0005] 2) The external prestressed tendons are in the shape of a broken line, and the prestress loss is relatively large. The single-span arrangement of the external prestressed tendons also requires tension at both ends, and there are many tension nodes; when multiple spans are arranged continuously, the external prestressed tendons need to be lapped Tensioning, the structure of tensioning nodes is complex;

[0006] 3) When the external prestressed tendons are installed and positioned, holes need to be opened in the floor slab or roof slab, which will affect the normal use function of the floor where the building reinforcement beam is located. When it is a roof slab, it will also damage the waterproof system of the roof;

[0007] 4) When the external prestressed tendon is loose during use, it cannot be stretched

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