UHPC small box girder structure

A technology of small box girders and box girders, which is applied to bridges, bridge parts, bridge materials, etc., can solve the problems of prestressed reinforced concrete structures, self-heaviness of steel-concrete composite structures, and large on-site construction operations. Facilitate on-site assembly construction, simplify the construction process, and save materials

Pending Publication Date: 2018-11-06
GUANGZHOU MUNICIPAL ENG DESIGN & RES INST CO LTD
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Problems solved by technology

[0003] Although there are various types of prefabricated bridges, they all have their own shortcomings: the steel structure has a large amount of on-site welding (bolts), and the steel bridge deck has fatigue cracking problems; the steel-concrete composite structure has a large self-weight, and the bridge deck can only partially Prefabrication, large amount of on-site pouring; prestressed reinforced concrete structure is heavy, the horizontal connection is easy to be damaged, and there are many durability diseases
UHPC materials have been greatly developed in the field of bridges in countries such as France and Malaysia, but in my country, their theoretical research is mostly concentrated in the three forms of T-beam, wide box girder and π-beam, and the research

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  • UHPC small box girder structure
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  • UHPC small box girder structure

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[0027] refer to Figure 1 to Figure 7 , the UHPC small box girder structure of the present invention includes a plurality of adjacent box girder bodies 10, the box girder body 10 is prefabricated by ultra-high performance concrete, and the box girder body 10 can also be made of ultra-high performance concrete (UHPC, Ultra-High Performance Concrete) and similar materials, such as high-performance cement-based composite materials such as CRC, DSP, FRHPC, HPFRCC, RPC, STC, UHPFRC, etc. The thickness of the top plate 11, the bottom plate 12 and the web plate 13 varies along the longitudinal direction, that is, the thickness of the top plate 11, the bottom plate 12 and the web plate 13 is relatively large at the end of the box girder body 10, and the thickness of other parts is relatively thick. Small. The box girder body is a thin-walled box girder made of UHPC (Ultra High Performance Concrete) material. Compared with traditional box girder, it saves more material, and the beam w...

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Abstract

The invention discloses an UHPC small box girder structure. The UHPC small box girder structure comprises multiple box girder bodies connected with each other through longitudinal joints; the box girder bodies are prefabricated by ultra-high performance concrete; the box girder bodies consist of top plates, bottom plates, web plates, midspan diaphragms and end diaphragms; retard-bonded prestressedtendons are embedded in the box girder bodies in a longitudinal direction; internal side templates and external side templates which are fixedly connected with each other through bolt connecting pieces are arranged in the end parts of the box girder bodies; the end diaphragms are integrally poured between the internal side templates and the external side templates; and the box girder bodies are thin-walled box girders consisting of UHPC materials. Materials are effectively saved, the girder weight is reduced by about 40%, the retard-bonded prestressed tendons are embedded in the box girder bodies so that the materials are saved and the girder height is reduced; corrosion and changing problems of external prestressed tendons are avoided; and the maintenance cost in the operation period isgreatly reduced.

Description

technical field [0001] The invention relates to the technical field of bridge engineering structures, in particular to a UHPC small box girder structure. Background technique [0002] In recent years, my country has actively explored and enriched green bridge construction methods with high speed, low road interference and quietness, vigorously advocated prefabricated construction of bridges, and actively explored the application of new materials in prefabricated bridges, and built a large number of representative bridges. The prefabricated bridges, industrialized production and prefabricated construction of bridges have become a major trend. [0003] Although there are various types of prefabricated bridges, they all have their own shortcomings: the steel structure has a large amount of on-site welding (bolts), and the steel bridge deck has fatigue cracking problems; the steel-concrete composite structure has a large self-weight, and the bridge deck can only partially Prefab...

Claims

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Application Information

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IPC IPC(8): E01D2/04E01D19/06E01D101/28
CPCE01D2/04E01D19/067E01D2101/28
Inventor 宁平华唐明裴彭聪王晟郭钰瑜邓德伦熊正元杨勇欧键灵王如寒麦梓浩
Owner GUANGZHOU MUNICIPAL ENG DESIGN & RES INST CO LTD
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