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A prestressed self-maintaining composite beam without web reinforcement based on slow bonded prestressed UHPC permanent formwork and its construction method

A slow-bonding prestressed, permanent formwork technology, applied in the direction of bridges, bridge construction, bridge materials, etc., can solve the problems of long construction period, etc., and achieve the effect of improving shear resistance, high tensile strength, and increasing stiffness

Active Publication Date: 2021-03-19
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention is suitable for prefabricated construction, and can be applied to structural forms such as I-shaped beams and box girders. The construction method in the present invention has simple construction technology, high construction efficiency, and can solve the problem of long construction period of traditional prestressed concrete beams.

Method used

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  • A prestressed self-maintaining composite beam without web reinforcement based on slow bonded prestressed UHPC permanent formwork and its construction method
  • A prestressed self-maintaining composite beam without web reinforcement based on slow bonded prestressed UHPC permanent formwork and its construction method
  • A prestressed self-maintaining composite beam without web reinforcement based on slow bonded prestressed UHPC permanent formwork and its construction method

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with accompanying drawing and embodiment:

[0034] Such as figure 1 with figure 2 As shown, the present invention is a prestressed self-curing composite beam without web reinforcement based on slow bonding prestressed UHPC permanent formwork. The head plate 4, the base plate 2, the web formwork 3 and the end plate 4 are all prefabricated by ultra-high performance concrete (UHPC). The UHPC strength is 150 MPa, and the fiber content is 2% to 4%. The surface is prefabricated with a return-shaped slot 5, and vertically inserted into the return-shaped slot 5 are two sets of abdominal formwork 3 and two sets of end inserting plates 4, and the two sets of abdominal formwork 3 and two sets of end inserting plates 4 are symmetrical in pairs A beam web body 6 with a rectangular hollow structure is provided, the top plate 1 is prefabricated by high-performance concrete, and the strength of the high-performance...

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Abstract

The invention discloses a web bar free prestressed self-curing composite beam based on a retard-bonded prestressed UHPC (ultra-high-performance concrete) permanent template and a construction method.The composition bean comprises a top plate, a sleeving template and self-curing concrete, wherein the sleeving template comprises a bed plate, web plates and end plug boards, the bed plate, the web plates and the end plug boards are all prefabricated by UHPC, and a dual-rectangle-shaped inserting groove is preformed in the upper surface of the bed plate. The composite beam adopts UHPC as a permanent template material, an inner cavity of a beam web is filled with self-curing concrete, conventional stirrups are omitted, material characteristics of UHPC and concrete are sufficiently played, the structure form is optimized, the artificial curing link of concrete is omitted, and the problem of high cost of pure prestressed UHPC beams is solved. The composite beam is applicable to assembly typeconstruction and can be adapted to structures such as I-type beams, box girders and the like. The construction method is simple in construction process and high in construction efficiency and solves the problem of long construction cycle of conventional prestressed concrete beams.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a prestressed self-maintaining composite beam without web reinforcement based on slow bonded prestressed UHPC permanent formwork and a construction method. Background technique [0002] Prestressed concrete beams are usually prefabricated with formwork during construction, the binding of steel bars is complicated, the construction process is cumbersome, and the quality of concrete pouring is not easy to control. The survey of existing prestressed concrete bridge diseases found that the prestressed concrete beams in service have serious diseases, such as structural cracking and steel corrosion, which not only affect the safety of the bridge, but also affect the safety and performance of the structure. Ultra-high performance concrete (UHPC) is a cement-based material with excellent physical and mechanical properties. It has high tensile and compressive strength, good toughness and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D2/00E01D21/00E01D101/28
CPCE01D2/00E01D21/00E01D2101/28
Inventor 王景全胡玉庆贺志启姚一鸣李帅
Owner SOUTHEAST UNIV
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