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Continuous preparation method and anchoring method of FRP pultruded profile

A technology of pultrusion profiles and anchoring methods, which is applied in the fields of civil engineering and composite materials, can solve the problems of FRP profiles such as difficult anchorage, poor ductility, and low FRP shear strength, so as to shorten the anchorage length, increase the bonding surface area, and improve The effect of anchoring efficiency

Pending Publication Date: 2022-03-18
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, FRP has low shear strength and poor ductility
This makes FRP profiles, especially smooth profiles, difficult to anchor

Method used

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  • Continuous preparation method and anchoring method of FRP pultruded profile
  • Continuous preparation method and anchoring method of FRP pultruded profile
  • Continuous preparation method and anchoring method of FRP pultruded profile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 As shown, a continuous preparation method of FRP pultruded rods with loose filaments at the end, fibers 2 are drawn out from the creel 1, and are evenly and neatly arranged, pulled by a traction device 8, and guided by a roller 4, Entering and passing through the impregnation tank 3 filled with resin, the impregnated fiber first passes through the preforming mold 5 and gradually transitions into the shape of a bar while extruding excess resin, and then passes through the forming mold 6 to solidify and form.

[0033] Connect a two-way pump 11 and the glue container 12 for the dipping tank 3, when the fiber 2 does not need to be dipped, use the bidirectional pump 11 to suck out a part of the resin in the dipping tank 3 and inject it into the glue container 12, so that the dipping The water level of the resin in the groove 3 drops, and at this moment, the fiber 2 cannot soak the resin, thereby forming a loose filament section 10, which is cut at the middle...

Embodiment 2

[0036] Such as Figure 4As shown, a continuous preparation method of FRP pultruded sheets with loose filaments at the ends, fibers 2 are drawn out from the creel 1, and are evenly and neatly arranged, pulled by a traction device 8, and guided by a roller 4, Entering and passing through the impregnation tank 3 filled with resin, the impregnated fiber first passes through the preforming mold 5 and gradually transitions into the shape of a sheet while extruding excess resin, and then passes through the forming mold 6 to solidify and form.

[0037] The dipping tank 3 can move up and down. When the fiber 2 does not need to be dipped, the dipping tank 3 moves downward. At this time, the fiber 2 cannot be soaked with resin, thus forming a loose filament section 10. When the fiber 2 needs to be dipped , the dipping tank 3 moves upwards and returns to its original position, and at this time, the fiber 2 begins to infiltrate the resin again, and is cut at the middle position of the loos...

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Abstract

The invention discloses a continuous preparation method and an anchoring method of an FRP pultrusion profile, and the method comprises the following steps: firstly, during pultrusion, controlling the impregnation process of continuous fibers, belts, cloth or felts, so that the continuous fibers, belts, cloth or felts are not continuously impregnated, and the continuous production of a section of loose filiform FRP pultrusion profile with resin and a section of loose filiform FRP pultrusion profile without resin is realized; and cutting the produced material in the middle position of the loose filament section without the resin to form a section of FRP pultrusion profile which is free of the resin at the two ends and only has the fiber. The FRP pultruded profile or a plurality of parallel profile bundles of which the ends are in a loose filament shape are inserted into the anchoring sleeve, and then the sleeve is filled with an adhesive, so that the bonding type anchoring structure of the FRP profile or the profile bundles which are directly bonded with fibers is formed. According to the continuous preparation method and the anchoring method of the FRP pultruded profile, the FRP pultruded profile which is suitable for anchoring and is provided with the scattered filament-shaped end heads can be rapidly, efficiently and continuously produced, the anchoring performance of the FRP is remarkably improved, the applicability of the FRP is improved, and the continuous preparation method and the anchoring method of the FRP pultruded profile are suitable for batch and large-scale production and popularization.

Description

technical field [0001] The invention relates to a continuous preparation method and an anchoring method for FRP (fiber reinforced composite material) pultrusion profiles, belonging to the technical fields of civil engineering and composite materials. Background technique [0002] Fiber Reinforced Polymer (FRP) is a high-performance material compounded with high-performance fibers such as carbon fiber, glass fiber, aramid fiber and basalt fiber as reinforcement, and resin as a matrix. FRP has many advantages such as light weight, high strength, and corrosion resistance. It is suitable for making cables or prestressed tendons, replacing traditional steel cables or steel prestressed tendons, and improving the mechanical properties and durability of civil engineering structures. [0003] FRP cables or prestressed tendons are often made of FRP pultruded profiles with solid circular or rectangular sections (solid circular cross-section FRP pultruded profiles are also called FRP ro...

Claims

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Application Information

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IPC IPC(8): B29C70/52
CPCB29C70/521
Inventor 刘越韦青岳清瑞
Owner BEIJING UNIV OF TECH
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