A prestressed self-maintaining composite beam without web reinforcement based on permanent post-tensioned prestressed uhpc formwork and its construction method

A post-tensioning prestressing and self-maintenance technology, which is applied in the direction of erecting/assembling bridges, bridges, bridge construction, etc., can solve problems such as long construction period, achieve the effect of improving shear resistance, increasing stiffness, and solving cracking

Active Publication Date: 2021-04-27
SOUTHEAST UNIV
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  • Summary
  • 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.

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  • A prestressed self-maintaining composite beam without web reinforcement based on permanent post-tensioned prestressed uhpc formwork and its construction method
  • A prestressed self-maintaining composite beam without web reinforcement based on permanent post-tensioned prestressed uhpc formwork and its construction method
  • A prestressed self-maintaining composite beam without web reinforcement based on permanent post-tensioned prestressed uhpc formwork and its construction method

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with accompanying drawing and embodiment:

[0036] Such as figure 1 and figure 2 As shown, a prestressed self-curing composite beam without web reinforcement based on permanent post-tensioned prestressed UHPC suit formwork of the present invention includes a top plate 1, a suit formwork and self-curing concrete 8, and the suit formwork includes a base plate 2, a web formwork 3 and The end 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 150MPa, the fiber content is 2% to 4%, The upper surface is prefabricated with a return-shaped slot 5, and vertically inserted in the return-shaped slot 5 are two sets of abdominal formwork 3 and two sets of end inserting plates 4, and two sets of abdominal formwork 3 and two sets of end inserting plates 4 are arranged in pairs. The beam web body 6 is symmetrically ...

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Abstract

The invention discloses a prestressed self-maintaining composite beam without web reinforcement based on a permanent post-tensioned prestressed UHPC set template and a construction method thereof. The composite beam includes a top plate, a set template and self-curing concrete, and the set template includes a base plate and a web template And the end plate, the base plate, the web formwork and the end plate are all prefabricated by ultra-high performance concrete, and the upper surface of the base plate is prefabricated with a return-shaped slot. The composite beam of the present invention uses UHPC as the permanent template material, self-curing concrete fills the inner cavity of the beam web body, removes the traditional stirrups, fully utilizes the material properties of UHPC and concrete, optimizes the beam structure, and saves the manual maintenance of concrete , while solving the problem of high cost of pure prestressed UHPC beams. The invention is suitable for prefabricated construction, and can be applied to structures such as I-shaped beams and box girders. The construction method in the invention has simple construction technology and high construction efficiency, and can solve the problem of long construction period of traditional 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 a permanent post-tensioned prestressed UHPC suit 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 toug...

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 戚家南李亮胡玉庆王景全
Owner SOUTHEAST UNIV
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