A Method for Strengthening Metal Pipe Joints Using Fiber Reinforced Composite Materials

A fiber-reinforced, composite material technology, used in building maintenance, construction, building construction, etc., can solve problems such as lack of research and design, late start, etc., to achieve the effects of beautiful node appearance, improved stiffness, and easy construction

Active Publication Date: 2017-11-10
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method started late in the field of metal structure reinforcement, especially the related research and design of metal pipe joint reinforcement is very lacking.

Method used

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  • A Method for Strengthening Metal Pipe Joints Using Fiber Reinforced Composite Materials
  • A Method for Strengthening Metal Pipe Joints Using Fiber Reinforced Composite Materials
  • A Method for Strengthening Metal Pipe Joints Using Fiber Reinforced Composite Materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Reinforcement of circular steel tube K-shaped gap joints with carbon fiber reinforced polymer (Carbon Fiber Reinforced Polymer, CFRP)

[0066] figure 1 It is a structural schematic diagram of a K-shaped gap node of a circular tube reinforced with a fiber-reinforced composite material according to an embodiment of the present invention. The reinforcement object is a round steel pipe K-shaped gap node, the size of the main pipe is Φ219mm×8mm, the diameter of the branch pipe is Φ133mm×6mm, the angle θ between the main pipe and the branch pipe is 55°, and the gap length g of the node domain is 40mm. The steel used for the nodes is Q235B.

[0067] First, surface treatment is carried out on the joints of steel pipes, and then adhesive is laid for reinforcement; the surface treatment is shot blasting, the purpose is to remove the rust layer, and make the surface rough to facilitate the adhesion of the adhesive layer; for places with more local oil pollution, use acetone to de...

Embodiment 2

[0102] Reinforcement of round aluminum tube K-shaped lap joints with glass fiber reinforced polymer (Glass Fiber Reinforced Polymer, GFRP)

[0103] Figure 23 It is a structural schematic diagram of a K-shaped lap joint of a circular tube reinforced with a fiber-reinforced composite material according to an embodiment of the present invention. The reinforcement object is a K-shaped lap joint of a round aluminum tube. The size of the main pipe is Φ200mm×6mm, the diameter of the branch pipe is Φ167mm×6mm, the angle θ between the main pipe and the branch pipe is 60°, and the lap rate Ov is 40%. Therefore, the lap length q is 77mm (take the gap length g as -77mm). The aluminum used for the nodes is 6061-T6.

[0104] First, surface treatment is carried out on the metal pipe joints, and then adhesive is laid for reinforcement; the surface treatment is shot blasting, the purpose is to remove the rust layer, and make the surface rough to facilitate the adhesion of the adhesive layer...

Embodiment 3

[0128] Reinforcement of round steel tube Y-shaped joints with carbon fiber reinforced polymer (Carbon Fiber Reinforced Polymer, CFRP)

[0129] Figure 24 It is a structural schematic diagram of a round tube Y-shaped node reinforced with a fiber-reinforced composite material according to an embodiment of the present invention. The reinforcement object is a Y-shaped joint of a round steel pipe, the size of the main pipe is Φ245mm×10mm, the diameter of the branch pipe is Φ180mm×8mm, and the angle θ between the main pipe and the branch pipe is 45°. Since the Y-shaped joint has only one branch pipe, it can be approximately considered as a special case of the K-shaped joint—the two branch pipes overlap each other, so the lap length can be approximately considered as the projected length of the branch pipe diameter on the main pipe axis (take the gap length g =-d / sinθ=-180 / sin45°=-255). The steel used for the nodes is Q235B.

[0130] First, surface treatment is carried out on the ...

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Abstract

The invention discloses a method for reinforcing metal pipe joints with fiber-reinforced composite materials. There are three steps of reinforced composite material cloth reinforcement and end anchorage, and finally curing. The method of the invention is simple and convenient in construction, does not need complex equipment, and is suitable for complex geometric shapes of pipe joints. At the same time, the pasted FRP material is light and high-strength, without additional node load. After the reinforcement is completed, the node has a beautiful appearance and good durability. The method of the present invention aims at common metal pipe nodes, by making the FRP material and the metal pipe nodes work together and suppressing the deformation of the nodes, to improve the static performance and fatigue performance of the nodes such as stiffness, ductility, bearing capacity; the method can also be Other types of pipe nodes provide reference for design ideas.

Description

technical field [0001] The invention belongs to the technical field of structural engineering in civil engineering, and relates to a method for reinforcing metal pipe joints. Background technique [0002] Metal tube structures have a long history and are widely used. However, with the development of society, the original design of many structures has been difficult to meet the current use requirements, and there have been many cases of damage or even destruction due to structural overload and other reasons. Therefore, the strengthening of the existing metal pipe structure, especially the reinforcement of its key parts—metal pipe joints has important theoretical significance and practical value. Traditional reinforcement methods include steel plate paste, casing reinforcement, rib plate welding, etc. Not only is the construction difficult, it affects the appearance, and the corrosion resistance is poor, but some methods (such as welding rib plates) are likely to cause stress ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04G23/02E04B1/58
Inventor 傅宇光童乐为周海明
Owner TONGJI UNIV
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