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Preflex prestressed concrete channel beam and its making method

A production method and concrete technology, which is applied in the field of bridge construction, can solve problems such as building height restrictions, and achieve the effects of light hoisting weight, improved fatigue resistance and earthquake resistance, and low building height

Inactive Publication Date: 2006-02-08
SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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Problems solved by technology

However, post-tensioned prestressed concrete structures are usually used, and the span range is generally 20m to 40m; in rail transit projects, the beam height of the double-line separated (single-line) prestressed concrete channel beam is generally about 2.00m to 2.50m. The thickness of the base plate is generally about 45cm. The height-span ratio of the currently used channel beams is generally about 1 / 8 to 1 / 10. This kind of prestressed concrete channel beams is still limited by the height of the building.

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  • Preflex prestressed concrete channel beam and its making method
  • Preflex prestressed concrete channel beam and its making method
  • Preflex prestressed concrete channel beam and its making method

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0012] The present invention is a pre-bent prestressed concrete channel beam, which is different from the prior art in that: the concrete beam is composed of a bottom plate 2 and webs 3 on both sides, and the whole is approximately groove-shaped or U-shaped, and the webs In order to wrap the concrete of the steel beam 1, several shear keys are welded on the steel beam, and the section of the web and the steel beam can be I-shaped, rectangular or box-shaped, and the steel beam is wrapped with the first-stage concrete and the second-stage concrete. For the web, the appropriate web type can be selected according to factors such as force characteristics, vehicle boundaries, and lane layout. For the double-line separated structure, the web should adopt the I-shaped or rectangular shape; for the double-line integral structure, the web should use Box or rectan...

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Abstract

The present invention is one kind of pre-bent pre-stressed concrete channel beam and its making process, and features that the concrete beam in channel shape or U shape consists of bottom plate and two side web plates. The web plates are concrete coated steel beam with welded shear keys, and the web plate and the steel beam have I-shaped, rectangular or box cross section. The making process of the concrete channel beam includes the five steps of: making steel beam, pre-pressing the steel beam, depositing the first concrete layer, releasing pre-bending force, and depositing the second concrete layer. Compared with available technology, the present invention has the advantages of large span, low building height, easy construction, excellent fatigue and vibration resistance, etc. and is especially suitable for use in condition with limited building height.

Description

Technical field: [0001] The invention belongs to the technical field of bridge construction, and in particular relates to an under-supporting pre-bent prestressed concrete channel girder suitable for railway bridges, highway bridges, urban viaducts and rail transit systems and a manufacturing method thereof. Background technique: [0002] At present, channel girders are widely used in the world. The earliest prestressed concrete channel girder abroad is the Rocherham Bridge built in Britain in 1952. After that, Japan, West Germany, and Australia have successively applied them in railway bridges. In the rail transit project, the prestressed trough beam with a double-line span of 50m was built in Lille, France; the prestressed trough beam with a span of 85m, a rectangular web, and a double-layer bottom plate was built on the Seine River for Line 13 in Paris. beam. The single-track trough-shaped girder with a span of 24m for the Beijing-Qin line across the Beijing-Chengdu line...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04C3/293E04G21/12
Inventor 任廷柱
Owner SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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