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A corrugated steel web composite box girder and its construction technology

A corrugated steel web, combined box technology, applied in bridges, bridge construction, erection/assembly of bridges, etc., can solve the problems of external cable corrosion protection, self-weight, waste of prestressed materials, etc.

Inactive Publication Date: 2015-11-04
XIAN HIGHWAY INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] First, in the medium-span corrugated steel web box girder bridges that have been built, the prestressed system mostly adopts a structural system in which internal cables and external cables are mixed. Long layout and limited tensioning space will lead to waste of prestressed materials, and the compressive stress index of some parts will easily exceed the allowable value of the code, which is unfavorable to the structural stress; for external cables, corrugated steel web composite box girder bridges are generally used It is required to set prestressed external cables in the box to balance the external load, which will bring about the problem of anti-corrosion of the external cables and the need to replace them after 25 years of use
[0005] Second, for the corrugated steel web composite box girder formed in one construction, after pouring the upper and lower flange concrete in the vertical formwork, there will be problems such as excessive structural creep, and the structural anti-arch value will also increase
[0006] Therefore, there is a lack of a corrugated steel web composite box girder with simple structure, reasonable stress, convenient construction, and good use effect and its construction technology, which can effectively solve the problem of large self-weight and tension space existing in existing concrete box girders. Problems such as limitations, high later maintenance costs, and poor mechanical performance

Method used

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  • A corrugated steel web composite box girder and its construction technology
  • A corrugated steel web composite box girder and its construction technology
  • A corrugated steel web composite box girder and its construction technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Such as figure 1 A corrugated steel web composite box girder shown includes a lower flange plate 3, an upper flange plate 2 located above the lower flange plate 3, and two symmetrical supports on the lower flange plate 3 and the upper flange plate 2 The corrugated steel web 1 between them, the upper flange plate 2 and the lower flange plate 3 are arranged horizontally along the longitudinal bridge direction of the bridge to be constructed, and the lower flange plate 3 is a cast-in-situ concrete plate and it is connected with the The upper flange plate 2 is fastened and connected as a whole through the two corrugated steel webs 1 , and the bottom of the corrugated steel web 1 and the lower flange plate 3 are fastened and connected through the lower shear connector. Such as figure 2 As shown, a prestressing system is arranged inside the lower flange plate 3 , and the prestressing system is located between two corrugated steel webs 1 . The prestressing system includes a...

Embodiment 2

[0116] In this embodiment, the construction of the corrugated steel web composite box girder is different from that in Embodiment 1 in that the middle prestressed structure is the second prestressed structure. to combine Figure 7 , the second prestressing structure includes a plurality of fourth prestressing tendons 4-4 and a plurality of fifth prestressing tendons 4-5, a plurality of fourth prestressing tendons 4-4 and a plurality of fifth prestressing tendons The prestressed tendons 4-5 are all arranged on the same horizontal plane. The lower flange plate 3 is formed by connecting a front end segment, a rear end segment and a middle segment connected between the front end segment and the rear end segment, the front end segment, the middle The segments and the rear end segments are arranged along the length direction of the lower flange plate 3 from front to rear. The length L1 of the middle section is 0.6L-0.7L, and the fourth prestressed tendons 4-4 and the fifth prestre...

Embodiment 3

[0139] In this example, if Figure 10 As shown, the difference between the constructed corrugated steel web composite box girder and that of Embodiment 1 is that the lower shear connector is a second shear connector structure. The second shear connection structure includes a plurality of first transverse connectors passing through the lower part of the corrugated steel web 1, and the plurality of first transverse connectors are all located on the same horizontal plane and are all along the bottom flange plate 3. The width direction is arranged, and the multiple first transverse connectors are arranged along the length direction of the lower flange plate 3 from front to back. A first through hole through which the transverse connecting piece passes. The lower part of the corrugated steel web 1 and the multiple first transverse connectors are poured into the lower flange plate 3 . The first transverse connecting piece is a PBL connecting piece or a steel bar, and the PBL conne...

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Abstract

The invention discloses a composite corrugated steel web box girder and a construction technology of the composite corrugated steel web box girder. The composite corrugated steel web box girder comprises a bottom flange plate, a top flange plate and two corrugated steel webs which are symmetrically supported between the bottom flange plate and the top flange plate. A prestress system is arranged in the bottom flange plate and comprises a middle prestress structure and two side prestress structures. The construction technology of the composite corrugated steel web box girder comprises the steps of (1) arranging and installing the prestress system and the corrugated steel webs; (2) constructing the bottom flange plate, wherein the construction of the bottom flange plate comprises the steps that firstly, pouring of concrete in the middle of a part of sections of the bottom flange plate and primary prestress tension are conducted, and secondly, pouring of concrete in the middle of the remaining sections of the bottom flange plate and secondary prestress tension are conducted; (3) constructing the top flange plate before construction of the bottom flange plate or in the process of construction of the bottom flange plate or after construction of the bottom flange plate. According to the composite corrugated steel web box girder and the construction technology of the composite corrugated steel web box girder, the design is reasonable, construction is convenient, the constructed and formed composite corrugated steel web box girder is reasonably stressed and good in use effect, and multiple kinds of problems of an existing concrete box girder can be solved.

Description

technical field [0001] The invention belongs to the technical field of box girder construction, and in particular relates to a corrugated steel web composite box girder and a construction process thereof. Background technique [0002] Composite structure bridges properly combine two different materials, steel and concrete, to improve the stability, strength and efficiency of materials used in the structure. Among them, the corrugated steel web composite structure properly combines two different materials, steel and concrete, and the corrugated steel web is arranged between the upper and lower flange plates. Specifically, the corrugated steel web with a thickness of about 10mm to 20mm is used Instead of the traditional concrete web with a thickness of about 300mm to 800mm, the upper and lower flanges are both concrete slabs, and the corrugated steel web and concrete flange are combined to form an integral structure to bear the load together. In terms of economic performance,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D2/04E01D21/00
Inventor 袁卓亚李立峰石雄伟柯亮亮许冰侯嘉庆周聪雷丹冯威苗建宝
Owner XIAN HIGHWAY INST
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