Prefabricated steel pipe-steel web-prestressed concrete composite box girder and construction technology

A steel plate concrete and prefabricated concrete slab technology, applied in bridges, bridge materials, bridge construction, etc., can solve the problems of heavy installation weight of single-piece box girder, complicated prefabrication construction, and high construction cost, achieve superior compressive performance, improve resistance to The effect of shearing ability and improving crack resistance

Pending Publication Date: 2020-02-28
吉林建筑科技学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Concrete box girders are widely used in engineering, but because the concrete box girder is a closed section, its prefabricated construction is relatively complicated, and the installation weight of a single-piece box girder is usually large, and the construction cost is high

Method used

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  • Prefabricated steel pipe-steel web-prestressed concrete composite box girder and construction technology
  • Prefabricated steel pipe-steel web-prestressed concrete composite box girder and construction technology
  • Prefabricated steel pipe-steel web-prestressed concrete composite box girder and construction technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] In this embodiment, the prefabricated steel pipe-steel web-prestressed concrete composite box girder is I-shaped, the steel pipe 2 is a round steel pipe, and the connecting piece is a stud 10 .

[0053] Such as Figure 1 to Figure 12 As shown, the prefabricated steel pipe-steel web-prestressed concrete composite box girder is an I-type composite box girder, comprising a steel pipe 2 filled with concrete, the top of the steel pipe 2 is provided with a prefabricated concrete slab 1, and the steel pipe 2 is filled with concrete. 2 A number of shear connectors 8 welded at the top correspond to a number of reserved holes 13 on the precast concrete slab 1 and are fixed by high-strength bonding mortar 9. The bottom end of the steel pipe 2 is welded to one end of the steel web 3, and the steel web 3 The other end is welded to the lower flange steel plate 4, and the connecting piece is evenly welded on the wide surface of the steel web 3 and the lower flange steel plate 4, and t...

Embodiment 2

[0060] The difference between this embodiment and embodiment 1 is that the steel pipe 2 adopts a square steel pipe, such as Figure 13 to Figure 15 shown.

Embodiment 3

[0062] The difference between this embodiment and Embodiment 1 is that the connector is a steel strip 1001 with holes, such as Figure 16 and Figure 17 shown.

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Abstract

The invention discloses a prefabricated steel pipe-steel web-prestressed concrete composite box girder and a construction technology. The prefabricated steel pipe-steel web-prestressed concrete composite box girder is divided into three types. The first type is an I-shaped composite box girder, and the I-shaped composite box girder includes a steel pipe, a prefabricated concrete plate, a steel webplate, a lower flange steel plate, steel plate concrete, prestressed steel bars, a steel cage, shear connecting pieces, high-strength bonding mortar, connecting pieces, corrugated pipes and anchoragedevices. The second type is a pi-shaped composite box girder, and the pi-shaped composite box girder includes two steel pipes, a prefabricated concrete plate, two steel web plates, two lower flange steel plates, steel plate concrete, prestressed steel bars, shear connecting pieces, high-strength bonding mortar, connecting pieces, steel cages and transverse steel plates. The third type of composite box girder includes two steel pipes, a prefabricated concrete plate, two steel web plates, a lower flange steel plate, steel plate concrete, prestressed steel bars, shear connecting pieces, high-strength bonding mortar, connecting pieces, steel cages and transverse steel plates. According to the prefabricated steel pipe-steel web-prestressed concrete composite box girder and the construction technology, the shear capacity of the web plates of the box girder is improved, and the prestressed steel bars are used for improving the crack resistance, stiffness and durability of the concrete.

Description

technical field [0001] The invention belongs to the technical field of composite box girders for bridge construction, and in particular relates to a prefabricated steel pipe-steel web-prestressed concrete composite box girder and a construction process. Background technique [0002] Steel box girder, also known as steel web box girder, is a common structural form of long-span bridges. It is generally made of steel webs connected by welding. It is processed in the factory and then transported to the site for installation. more and more widely used. There are mainly two types of box girders: concrete box girder and steel box girder. The cross section of the load-bearing structure of the box girder is closed, consisting of top plate, bottom plate, web and other parts. Resist large positive and negative bending moments. The top plate and bottom plate of the box girder are the main working parts of the structure to bear the positive and negative bending moments, while the funct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D2/04E01D21/00E01D101/28E01D101/30
CPCE01D2/04E01D21/00E01D2101/285E01D2101/30
Inventor 王连广李姗珊赵莹王蕾于莹周文军杨丹萍王帅聂红鑫王一博
Owner 吉林建筑科技学院
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