Preparation method of fiber reinforced polymer sheet

Abstract

The invention provides a preparation method of a fiber reinforced polymer sheet, and relates to a manufacturing method of the fiber reinforced polymer sheet used for enhancing and reinforcing an engineering structure. The preparation method comprises the following steps of: preparing a mixed fiber cloth; performing local reinforcement on two ends; and obtaining a finished product by a process of folding the mixed fiber cloth and prefabricating the two ends into waveform. The fiber reinforced polymer (FRP) sheet prepared by the method is small in width, is easy to be clamped and anchored by a wave-shaped-gear grip anchor, can bring the ultimate strength into full play, can significantly improve the reinforcement effect of the engineering structure, and is simple in manufacturing process, convenient in construction and low in cost. The method provided by the invention has the characteristics of flexible preparation mode, simple process, less production equipment, low cost and the like. The FRP sheet prepared by the method is widely used for enhancing and reinforcing newly-built or built engineering structures, and is particularly suitable to be used as a prestressed material to reinforce bridges or building constructions, and used as a stay cable, a suspension rod and the like for manufacturing bridges.

Description

1. Technical field [0001] The invention belongs to the technical field of fiber composite material preparation, and in particular relates to a method for manufacturing a high-strength fiber composite material sheet for reinforcing and reinforcing engineering structures. 2. Background technology [0002] High-strength fiber cloth (such as carbon fiber cloth, aramid fiber cloth, glass fiber cloth, basalt fiber cloth, polyethylene fiber cloth, etc.) has excellent characteristics such as light weight, high strength, corrosion resistance, and fatigue resistance. It is an ideal material for strengthening engineering structures (such as concrete structures, steel structures, wood structures, masonry structures, etc.), which can increase its bearing capacity or strengthen its anti-seismic ability and prolong its service life without increasing the weight of the engineering structure. When high-strength fiber cloth is used to strengthen and reinforce engineering structures, the metho...

AI Technical Summary

Problems solved by technology

However, the existing high-strength fiberboard has two major disadvantages: one is that the thickness is thin, generally around 1.5mm, its ultimate tensile force is generally around 12 tons, and the tensile force that can be used as prestress is generally below 8 tons, so only It can be used in the reinforcement of small components; the second is that when the fiberboard is clamped and anchored by the flat clamp anchor, it is easy for the fiberboard to slip from the flat clamp anchor, and the reliability is very poor

If the wave-tooth clamp anchor is used for clamping and anchoring, because the fiberboard cannot be bent at will, its bending degree is strictly limited, so only the anchor clamp with relatively flat wave-tooth teeth can be used, which reduces the anchorage of the wave-tooth clamp to a certain extent. reliability and economy

High-strength fiber cloth is woven directly from fiber filaments. It is not impregnated with resin and is very soft. It can be bent and cut at will, and it is convenient to transport and use. However, this fiber cloth also has three major disadvantages: one is its thin thickness, generally at 0.1 ~0.4mm, resulting in a small ultimate tensile force per unit width; the second is to directly stretch the fiber cloth not impregnated with resin, its actual tensile strength is very low, and the usable prestressed tensile tonnage is even lower It can only be used on small engineering structures; the third is that it must be impregnated with resin when used on site, and the quality of impregnated resin on site is difficult to guarantee, its actual strength is lower than that of fiber boards made by factories, and the construction period is also long

The main disadvantages of this carbon fiber prepreg tape are:

[0005] 1. The carbon fiber prepreg tape is very thin, and the ultimate tensile force of a single tape is low. When it is used for prestress reinforcement, its tensile tonnage is small. It is only suitable for the reinforcement of small-span concrete beams, and the two ends of the carbon fiber prepreg tape are only Flat mesh splint anchors can be used for clamping and anchoring, and it is easy for the prepreg tape to slip from the flat anchor, and the anchoring reliability is not high

[0006] 2. The prepreg tape is directly stretched at the construction site. Since the impregnated resin is not cured, the force of the fiber filaments is uneven during stretching, and its actual tensile strength is very low.

[0007] 3. As we all know, carbon fiber prepreg tapes that have been impregnated with resin but not yet cured are difficult to store for a long time. At higher temperatures, the impregnated resin will be completely cured within a few hours, which will make it unusable

This construction method is too complicated, especially when the carbon fiber prepreg tape is very long, there are many auxiliary facilities used, the construction is very troublesome, and the construction cost is very high

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