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Cold-formed thin-walled steel web combined PC box girder

A technology of cold-formed thin-walled steel and cold-formed steel, which is applied to bridges, bridge parts, bridge materials, etc., can solve the problems of easy cracking of the web, complex construction, and self-heavyness, etc., to achieve a slim structure and improve the bending resistance of the section ability and torsion resistance, the effect of light weight

Active Publication Date: 2021-06-18
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of complex construction, high cost, heavy weight, and easy cracking of the web of traditional concrete box girder components, and make full use of the characteristics of light weight, high strength, good seismic performance, low cost, and high degree of automation of cold-formed thin-walled steel structures, this project The invention provides a cold-formed thin-walled steel web combined PC box girder with the advantages of fast assembly speed, high degree of standardization, low cost, light weight, and excellent bending resistance and crack resistance, which is suitable for main girders of bridge structures or Building structure primary and secondary beams and other components

Method used

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  • Cold-formed thin-walled steel web combined PC box girder
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  • Cold-formed thin-walled steel web combined PC box girder

Examples

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example 1

[0026] Such as figure 1 As shown, this example provides a cold-formed thin-walled steel web composite PC box girder for the main girder of bridge structure, including upper flange (1), truss-type cold-formed steel composite lower flange (2), truss Type cold-formed steel composite web (3), angle steel connectors (4), self-tapping self-drilling screws and other connectors (5) and C-type cold-formed thin-walled steel connectors (6).

[0027] Such as Figure 2-3 As shown, the upper flange (1) is composed of a prefabricated concrete composite panel (1a) and a cast-in-place concrete section (1b), and the precast concrete composite panel (1a) is a UHPC-reinforced concrete panel with a thickness of 300mm. The cast-in-place concrete section (1b) is UHPC material. The prefabricated concrete composite slab (1a) is provided with a circular post-casting hole (1c) penetrating through the thickness of the slab. The post-cast hole (1c) is also filled with UHPC during the construction of th...

example 2

[0033] This example provides a cold-formed thin-walled steel web composite PC box girder used for primary and secondary beams of building structures.

[0034] The upper flange (1) is composed of a precast concrete composite slab (1a) and a cast-in-place concrete section (1b), and the precast concrete composite slab (1a) is a recycled concrete-reinforced concrete slab with a thickness of 70 mm. The cast-in-place concrete section (1b) is recycled concrete material. The prefabricated concrete composite slab (1a) is provided with a square post-casting hole (1c) penetrating through the thickness of the slab. The post-cast hole (1c) is filled with recycled concrete during the construction of the cast-in-place concrete section (1b). The two longitudinal sides of the prefabricated concrete composite slab (1c) are provided with installation holes (1d) with a spacing of 100mm, and are connected with the truss-type cold-formed steel web (3) and the angle steel connector (4) through cros...

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Abstract

The invention discloses a cold-formed thin-walled steel web combined PC box girder, comprising an upper flange, a lower flange and two truss type cold-formed steel combined webs. According to the invention, the web and the lower flange are both formed by combining the cold-formed thin-walled steel, the dead weight of the girder body is reduced, and span breakthrough is achieved; the web and the lower flange are in a truss form, so the overall stability of the structure can be improved, and the problem of poor local stability of the cold-formed thin-walled steel is solved; the webs are made of the cold-formed thin-walled steel, so the problem that webs of common prestressed concrete beam bridges are prone to cracking is fundamentally solved; and factory production of the cold-formed thin-walled steel and a prefabricated laminated slab can effectively accelerate the construction progress and improve the quality of components. The box girder of the invention has the advantages of being high in assembly speed, high in standardization degree, low in manufacturing cost, light in self-weight and excellent in bending resistance and crack resistance, can effectively solve the problems that a traditional concrete box girder component is complex in construction, high in manufacturing cost, large in self-weight, prone to web cracking and the like, and is suitable for bridge structure girders or main and secondary beams and other components of a building structure.

Description

technical field [0001] The invention relates to a cold-formed thin-walled steel web combined PC box girder with the advantages of light weight, high degree of standardization, good crack resistance and low cost, which belongs to the field of bridge engineering structures and can also be used in the technical field of building structures. Background technique [0002] Prestressed concrete bridge is one of the common bridge types in our country. However, with its wide application, a series of problems in the construction and operation of prestressed concrete bridges have gradually emerged. During the construction stage, this kind of bridge structure has problems such as heavy beam body, difficult transportation, many wet operations on site, and difficulty in guaranteeing the quality of concealed construction of prestressed pipelines. The main problems in the operation stage are: easy cracking of the web, large shrinkage and creep, obvious loss of prestress, mid- and long-term...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D19/00E01D2/04E01D101/24E01D101/26E01D101/30
CPCE01D19/00E01D2/04E01D2101/24E01D2101/26E01D2101/30
Inventor 丁梦佳许维炳黄晓敏孙航陈彦江杨坤孙孟晓
Owner BEIJING UNIV OF TECH
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