Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

FRP bellow-reinforcing composite bar

A technology of corrugated pipes and composite bars, applied in the directions of structural elements, building components, building reinforcements, etc., can solve the problems of unfavorable stress of composite bar structures, disappearance of the protective effect of steel bars, and reduced bearing capacity of composite bars, and achieve good corrosion resistance. Performance, corrosion avoidance, tensile deformation ability improvement effect

Pending Publication Date: 2019-06-04
BEIJING UNIV OF TECH
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the curves in the figure, OAFB is the F-l curve of ordinary ribbed steel bars, OC is the F-l curve of FRP bars, and ODECH is the F-l curve of FRP-wrapped ribbed steel bars proposed by the prior art. It can be seen from the figure that the prior art proposed FRP-wrapped ribbed steel bars form a composite bar that stretches and deforms together with the steel bar from the initial stage, but the FRP material breaks when the tensile strain is small, and the protective effect of the FRP on the steel bar disappears after the fracture, and the bearing capacity of the composite bar suddenly decreases. Unfavorable to the stress of the composite reinforcement structure
At the same time, due to the small breaking strain of FRP bars, when the composite bars proposed in the prior art are bent, the fibers on the tension side break early, and the protection of the steel bars at the bends becomes invalid.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • FRP bellow-reinforcing composite bar
  • FRP bellow-reinforcing composite bar
  • FRP bellow-reinforcing composite bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing FRP corrugated pipe-steel bar composite bars, firstly design and process the corrugated inner film and outer mold according to the FRP corrugation, and pull the carbon fiber bundles through the pulling device at a certain pultrusion rate, and the carbon fiber bundles are drawn from the pultrusion machine The creel is removed from the creel and enters the dipping tank filled with epoxy resin. The fiber bundles are fully impregnated evenly by the resin matrix, and then pass through the corrugated inner membrane circularly. Circular high-temperature die, overall solidified molding. The corrugated inner film and corrugated outer mold are removed, and the preliminarily cured FRP corrugated pipe is further cured at a high temperature in a post-curing furnace to form a circular corrugated pipe of continuous fiber reinforced resin composite material. Insert the ribbed steel bar into the FRP corrugated pipe after high-temperature curing and temporarily fix...

Embodiment 2

[0026] A preparation method of FRP bellows-steel bar composite bar, the ribbed steel bar is passed through the dipping tank equipped with epoxy resin, so that the surface of the ribbed steel bar is evenly coated with a certain thickness of epoxy resin glue, and the carbon fiber bundle is passed through the Under the traction of the pulling device at a certain pultrusion rate, the carbon fiber bundles fall from the creel of the pultrusion machine and enter the impregnation tank filled with epoxy resin. The ribbed steel bar with epoxy resin glue is bonded with the epoxy resin glue around the ribbed steel bar, and then passed through the circular high-temperature die, and the whole is cured and formed. Put the cured and molded composite bar into post-curing equipment for post-curing to obtain the FRP bellows-steel bar composite bar of the present invention.

[0027] The outer FRP corrugated pipe of the composite rib adopts one fiber or a combination of multiple fibers among carbo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a FRP bellow-reinforcing composite bar. The FRP bellow-reinforcing composite bar includes a FRP bellow, a ribbed steel bar and a bonding material, wherein a gap between the FRPbellow and the reinforcing steel bar is filled with the binding material. According to the FRP bellow-reinforcing composite bar, the internal ribbed steel bar and the external FRP bellow are solidified through the binding material to form the composite bar, and the composite bar has good corrosion resistance; when the composite bar is tensed, the FRP bellow and the ribbed steel bar are subjectedto large tensile deformation in the axial direction together, and the defect that strain at break of FRP materials is small is overcome; the composite bar has good shear strength, the defect that theshear strength of a pure FRP bar is low is overcome; a corrugated structure of the FRP bellow helps to achieve good bonding performance between the internal steel bar and external concrete; the composite bar has good bending performance, and the corrugated structure of the FRP bellow avoids that outer side fibers are broken during bending of a steel bar; and the structure is simple, the performance is excellent, and the FRP bellow-reinforcing composite bar can be widely applied to a load-bearing steel bar in a civil engineering structure of a corrosive environment.

Description

technical field [0001] The invention belongs to the field of civil engineering structures, in particular to an FRP corrugated pipe-steel bar composite bar. Background technique [0002] my country is carrying out large-scale infrastructure construction, and the infrastructure construction in the central and eastern regions is relatively complete. The infrastructure construction center is gradually shifting to the west, south and offshore areas. In recent years, the East China Sea Bridge, the Hangzhou Bay Bridge and the Hong Kong Cross-sea projects such as the Zhuhai-Macao Bridge, offshore and even deep-sea projects are important construction tasks in the future. The biggest problem encountered in civil engineering construction in marine and other corrosive environments is corrosion. The corrosion of reinforced concrete components cannot be ignored, and it is also a key problem that is difficult to solve. How to ensure the anti-corrosion and durability of offshore or even dee...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): E04C5/00E04C5/01E04C5/07
Inventor 贾俊峰谭豫卿白玉磊杜修力
Owner BEIJING UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products