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Method for repairing and reinforcing concrete structure under severe environment

A technology for concrete structures and harsh environments, applied in building maintenance, building construction, construction, etc., can solve the problems of lack of patents and documents, and achieve the effects of rapid development, strong reinforcement effect, and wide application.

Active Publication Date: 2014-08-20
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent application whose application number is 200910010259.3 also discloses the method of strengthening and repairing concrete structures with fiber braided mesh, but there are no patents and documents about using FRP bars and fiber braided mesh to repair and strengthen concrete structures at the same time.

Method used

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  • Method for repairing and reinforcing concrete structure under severe environment
  • Method for repairing and reinforcing concrete structure under severe environment
  • Method for repairing and reinforcing concrete structure under severe environment

Examples

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Embodiment 1

[0030] Embodiment 1: A beam is strengthened with the method of the present invention, and the cross-sectional size of the beam is 500mm high and 250mm wide. The environmental category is Class I, the concrete strength grade is C25, and the compressive design strength is f c =11.9N / mm 2 , the member is configured with 4 HRB335-grade main reinforcements with a diameter of 16mm, and the tensile design strength is f y =300N / mm 2 , the thickness of the protective layer is 35mm, and the design value of the bending moment at the mid-span of the beam is 100kN m. Since the beam needs to temporarily bear the force exceeding the design load, under the action of the new load, the maximum bending moment at the mid-span of the beam should reach 300kN m. Reinforcement of the structure is required.

[0031] The strengthening method of this structure is proposed to adopt the combination of FRP reinforcement and fiber braided mesh. The fiber composite bar made of glass fiber, the tensile st...

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Abstract

The invention provides a method for repairing and reinforcing a concrete structure under a severe environment, and belongs to a method for repairing and reinforcing a concrete structure. The method specifically includes the step of FRP rib reinforcement and the step of fiber woven mesh reinforcement. In the step of FRP rib reinforcement, grooving and dust removing are conducted in a concrete protection layer of a beam to be reinforced through a cutting machine, wherein the surface of concrete is kept dry and is not wet; a half of the portion inside each groove is filled with epoxy resin and epoxy resin curing agents or high-performance fine concrete bonding materials; FRP ribs are placed in the grooves, and the grooves are filled with the bonding materials by slightly conducting extrusion; the surfaces are smeared flat, and operators need to wait till the bonding agents are solidified. In the step of fiber woven mesh reinforcement, firstly, the surface of a building to be reinforced is machined to be uneven; the surface of the building to be reinforced is wetted by water, and stirred fine concrete is sprayed to the structure and the surfaces of fiber woven meshes; a layer of fine concrete is sprayed on each layer of fiber woven mesh each time a layer of fiber woven mesh is laid, and water curing is conduced on the fine concrete through water till the age. By means of the good corrosion resistance of the FRP ribs and the fiber woven meshes, the method is more effective under the severe environment such as ocean.

Description

technical field [0001] The invention relates to a method for repairing and strengthening concrete structures, in particular to a method for repairing and strengthening concrete structures in harsh environments. technical background [0002] Harsh environment such as: ocean, severe cold, subtropical and salt lake and other harsh environments. Due to the aging of the structure after long-term use, as the service time of the structure increases, it is affected by climate conditions, environmental erosion, physical effects and other external factors, and the performance of the structure degrades, and the structure is damaged or even destroyed. Due to design errors, lax construction management, changes in use conditions or deterioration of the use environment, natural disasters and accidental accidents and other subjective and objective factors, the newly-built structure also needs to be strengthened, reinforced, and transformed. [0003] Commonly used structural reinforcement m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G23/02
Inventor 尹世平王波吕恒林
Owner CHINA UNIV OF MINING & TECH
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