Articulated anchor and prestress tensioning method of high strength fibre composite sheet

Abstract

An articulated anchor and a prestress tensioning method of high strength fibre composite sheet relate to an anchor holder used to perform prestress tensioning to the high strength fibre composite material of the enhancement or reinforcement engineering structure and a method thereof. The articulated anchor of the invention comprises an anchor head and a compression and locking device, and the articulated anchor is characterized in that the anchor head contains a raised head anchor and a concave block. The method of the invention is that the articulated anchor is used to clamp and anchor the two ends of FRP sheet, a jack is used to apply a tension on the concave block and the concave block pushes the raised head anchor to perform prestress tensioning to FRP sheet. The articulated anchor of the invention has simple structure, convenient installation and low cost; and the method of the invention is simple, intuitive and practical, and can ensure the tensioning uniformity of FRP sheet, made full use of the intensity of FRP sheet and effectively increase the bearing capacity of the engineering structure. The articulated anchor of the invention can be widely used to enhance or reinforce the large engineering structures such as bridges or buildings and especially to perform external prestressing reinforcement to longspan concrete beams, longspan concrete slabs and the like.

Description

1. Technical field [0001] The invention belongs to the technical field of prestressed tensioning of high-strength fiber composite materials, and in particular relates to an anchor clamp and method for reinforcing or reinforcing engineering structures of high-strength fiber composite material prestress. 2. Background technology [0002] High-strength fiber composite materials (English name Fiber Reinforced Polymer, referred to as FRP), such as carbon fiber reinforced plastics, polymer fiber reinforced plastics, glass fiber reinforced plastics, etc., have the characteristics of light weight, large bearing capacity, fatigue resistance, and corrosion resistance. , Widely used in aerospace, aircraft manufacturing, sports and entertainment products, ships, automobiles, construction and other fields. In particular, the prestressed high-strength fiber composite sheet (FRP sheet for short) can be widely used to strengthen or reinforce civil engineering structures (such as concrete st...

AI Technical Summary

Problems solved by technology

[0004] 1. When using this device to prestress and stretch the carbon fiber plate, the positioning accuracy of the anchor beam is very high. It is difficult to ensure that the fixture anchors at both ends of the carbon fiber plate are accurately centered during construction, which is due to the uneven tension of the carbon fiber plate during tension. La planted a hidden danger

[0005] 2. The tensioning device uses two hydraulic jacks to push synchronously. When tensioning the carbon fiber board, it is difficult to keep the two jacks in precise synchronization, which directly causes uneven tensioning of the carbon fiber board.

[0006] 3. After the prestressed tensioning of the carbon fiber plate is completed, there are many parts permanently retained on the reinforced structure. These parts can only be used once, which increases the maintenance cost in the later period and correspondingly increases the cost of prestressed reinforcement

[0008] 1. This method is to transversely stretch the fiber cloth not impregnated with resin, but the actual tensile strength of the fiber cloth not impregnated with resin is very low. The longer the fiber cloth is, the lower the actual tensile strength is. The obtained pretension is very limited, thereby reducing the reinforcement effect on the concrete beam

[0009] 2. When using this method for transverse tensioning, if the relative deformation between the support frames at both ends is large, it will cause a large loss of pre-tension force in the fiber cloth, thus affecting the reinforcement effect of the concrete beam

[0010] 3. The movement of the lateral load-bearing beam in this method is controlled by the tension nuts on both sides, and it is difficult to keep up with it synchronously. The uniformity of the fiber cloth tension is very poor, which affects the strength of the fiber cloth.

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