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Prestress construction method for combined steel beam

A construction method and prestressing technology, applied in the processing of building materials, construction, building components, etc., can solve the problems of difficult construction of prestressed tendons, limited prestressing of section steel, large deflection of large-span construction, etc., and achieve the improvement of concrete prefabrication rate , The area of ​​the pre-pressing area is increased, and the effect of superior performance

Pending Publication Date: 2022-04-29
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology

And there are many combinations of composite steel beams: double linear type, double arch type, and small upper and lower, which are respectively used to solve the limited prestress of section steel caused by the low height of the precompression zone, large deflection in large-span construction and prestress Reinforcement construction difficulties and other issues

Method used

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  • Prestress construction method for combined steel beam
  • Prestress construction method for combined steel beam
  • Prestress construction method for combined steel beam

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Embodiment Construction

[0035] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0036] refer to Figure 1 to Figure 5 , the mixed prestressed composite beam includes prefabricated composite beam and cast-in-place concrete 6, the prefabricated composite beam mainly includes the lower section steel 1 and the precast concrete 3 poured on the lower section steel 1, and the mid-span prestressed tendon 4 is stretched in the precast concrete 3, correspondingly The lower section steel 1 adjacent to the prefabricated composite beam is connected at the end with spacing. The cast-in-place concrete 6 is poured above the lower section steel 1 and between the adjacent prefabricated composite beams, the mid-span prestressed tendon 4 extends and extends into the cast-in-place concrete 6, and the ends are fixed.

[0037] In this structure, the mid-span prestressed tendon 4 is stretched from both ends of the precast concrete 3 under the pre...

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Abstract

The main process of the combined steel beam prestress construction method comprises the steps of pre-bending of a combined steel beam, pouring of prefabricated concrete and tensioning of prestressed tendons. Wherein the combined steel beam is composed of the lower section steel and the auxiliary section steel which are fixed through bolts, and in the pre-bending process, due to the fact that the combined steel beam has higher rigidity, the midspan deflection in the pre-bending process can be greatly reduced, and the effects of small deflection and high stress are achieved; after the two are bound, the position of the neutral shaft moves upwards, the area of an effective pre-pressing area is increased, the concrete prefabrication rate is improved, and the site construction amount is reduced. In addition to the most basic double-linear combination mode, the invention also provides a double-arch combination mode and a big-end-up combination mode which are respectively used for solving the problem of overlarge deflection caused by large span and the problem of lower height of a small steel beam prepressing area.

Description

technical field [0001] The invention belongs to the technical field of buildings, and in particular relates to a prestressed construction method of composite steel beams. Background technique [0002] Steel concrete structures have good bearing capacity and stiffness, and are widely used in long-span and heavy-duty structures, but their crack resistance performance is average. Some scholars have proposed prestressed steel concrete structures, but at present, the prestress of steel concrete mainly depends on prestressing. If the reinforcement is provided, the degree of prestress that can be achieved is limited, and the loss of prestress is serious, and the control of the tensioning process is relatively strict, and phenomena such as reverse arching and cracking are prone to occur. If the single pre-bending beam prestressing construction method is used to directly apply the load to the section steel without the help of auxiliary section steel, the deflection will be too large ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G21/12E04C3/293E04B1/30
CPCE04G21/12E04C3/293E04B1/30
Inventor 于云龙贺九洲杨勇薛亦聪冯世强
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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