CN211371604U - Carbon fiber repairing and reinforcing structure of Y-shaped steel pipe structure - Google Patents

Abstract

The utility model discloses a carbon fiber restoration reinforcement structure of Y shaped steel tubular construction, be responsible for with steel pipe node branch pipe including vertically steel pipe node, the node steel pipe outside has carbon fiber reinforced composite through gluing agent parcel, steel pipe node main outside of tubes has the different person in charge carbon cloth of a plurality of layers of fibre orientation through gluing agent parcel, the outer parcel of steel pipe node branch pipe has the different branch pipe carbon cloth of a plurality of layers of fibre orientation, every layer of branch pipe carbon cloth all includes two trapezoidal branch pipe carbon cloth, branch pipe carbon cloth all is provided with the carbon fiber material strip with the person in charge carbon cloth outside, branch pipe carbon cloth still is provided with a plurality of anchor layering with the person in charge carbon cloth outside. The utility model discloses a to the not enough that prior art exists, provide a reasonable in design, simple structure, safe and reliable's Y type pipeline restores reinforcement structure.

Description

Carbon fiber repairing and reinforcing structure of Y-shaped steel pipe structure

Technical Field

The utility model relates to a reinforcement structure is restoreed to carbon fiber of Y shaped steel tubular structure.

Background

In various steel pipe structure equipment, facilities and buildings including oil and gas transmission pipelines, offshore platform jackets, onshore steel pipe structures and the like, a large number of field accidents show that the steel pipe structures are usually damaged at the node parts, the stress conditions of the steel pipe structures are far more complex than beam column members, the horizontal shearing force borne by the steel pipe structures is generally 4-6 times of the column shearing force under the action of earthquake, once the steel pipe structures are damaged, the whole structure is likely to collapse and damage, and therefore the steel pipe structure equipment, facilities and buildings need to be maintained or reinforced aiming at the pipe node parts of partial active structures; because the new construction is huge in cost and the parts needing to be reinforced are not easy to be overturned and rebuilt, the technology for reinforcing and repairing the steel pipe structure, which is economic and efficient, is an urgent technical problem to be solved and a social problem related to the sustainable development of national economy.

The existing method for reinforcing the intersecting joint of the steel pipes mainly comprises the steps of adding a sleeve pipe, a backing plate, a ring opening adding plate, reinforcing a stiffening ring of a main pipe, reinforcing a joint plate, reinforcing a rib plate and the like on the main pipe. The reinforcing modes have high processing requirements, are easy to rust, increase the dead weight of the original structure, have no effective anchoring on the core area of the node in the conventional reinforcing node, and bring new problems to the structure, such as unattractive appearance of a sleeve, a base plate and a ring plate; the construction difficulty of the stiffening ring is too large; the gusset plates and the ribbed plates can influence the use space of a building, the calculation result of reinforcing by the ribbed plates is not ideal, and the utilization rate of the ribbed plates is not high; since the welding makes the structure form a continuous whole, once the crack is unstably expanded, the crack may be broken to the end, which is quite harmful.

The technology is deeply valued internationally and widely applied to special structures such as chemical plants, civil buildings, bridges and the like, and becomes the development trend of steel pipeline structure repair and reinforcement; with the continuous application of composite material reinforcing technology, the technology gradually matures and gradually starts to be used in a large range; the carbon fiber reinforcement is suitable for repairing metal corrosion, cracks, carbon arc burns, slag inclusion or layering, internal corrosion defects which cannot be developed continuously, pits and spiral weld pipe body defects, the pipe body defect degree is below 80% of the wall thickness, the carbon fiber cloth is adhered to the surface of a member through a matched bonding material, so that the carbon fiber sheet bears tension, is coordinated with concrete deformation and bears force together, and has excellent physical properties such as high strength, light weight, corrosion resistance, fatigue resistance and the like, good adhesion and wide applicability.

However, the existing carbon fiber cloth reinforced steel pipe node structure is formed by winding carbon fiber cloth in the same shape on a steel pipe node, the method starts late in the field of metal structure reinforcement, and particularly relevant research and design in the aspect of metal pipe node reinforcement are very deficient, so that a set of reasonable and feasible carbon fiber reinforced metal pipe node design method is provided, and the method has important significance and provides reference for reinforcement design in the industry and reinforcement research in academia.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects of the prior structure, the utility model provides a reinforcement structure is restoreed to carbon fiber of reasonable in design, simple structure, safe and reliable's Y shaped steel tubular structure.

The utility model provides a structural scheme that its structural problem adopted is: the utility model provides a carbon fiber repairing and reinforcing structure of a Y-shaped steel pipe structure, which comprises a steel pipe node main pipe, steel pipe node branch pipes and a plurality of layers of carbon fiber reinforced composite materials, wherein the steel pipe node main pipe and the steel pipe node branch pipes are cylindrical pipes;

the carbon fiber reinforced composite material comprises a plurality of layers of main pipe carbon fiber cloth wrapped on the outer wall of the main pipe of the steel pipe node;

the carbon fiber reinforced composite material also comprises a plurality of layers of branch pipe carbon fiber cloth wrapped on the outer wall of the steel pipe node branch pipe, and each layer of branch pipe carbon fiber cloth is provided with two pieces of trapezoidal carbon fiber cloth;

carbon fiber material strips are arranged outside the branch pipe carbon fiber cloth and the main pipe carbon fiber cloth;

a plurality of layers of anchoring pressing strips are arranged at the joint of the outer ends of the outermost layer of the main pipe carbon fiber cloth and the outer wall of the main pipe of the steel pipe node, a plurality of layers of anchoring pressing strips are also arranged at the joint of the end of the outermost layer of the branch pipe carbon fiber cloth and the outer wall of the branch pipe of the steel pipe node, and the three layers of anchoring pressing strips are arranged;

each layer of branch pipe carbon fiber cloth is two pieces of trapezoid branch pipe carbon fiber cloth, the top edges of the two pieces of trapezoid branch pipe carbon fiber cloth are perpendicular to the left side and the right side, and the bottom edges are inclined edges, one piece of trapezoid branch pipe carbon fiber cloth is wrapped on one side of the outer pipe wall of the steel pipe node branch pipe, the other piece of branch pipe carbon fiber cloth is positioned on the other side of the outer pipe wall of the steel pipe node branch pipe, the bottom edges of the two pieces of trapezoid branch pipe carbon fiber cloth are positioned at the joint of the steel pipe node branch pipe and the steel pipe node main pipe, and an overlapping part is arranged between the two pieces of;

the winding direction of the main pipe carbon fiber material strip is 0 degree compared with the winding direction of the main pipe of the steel pipe node, and the winding direction of the branch pipe carbon fiber material strip is 0 degree compared with the winding direction of the branch pipe of the steel pipe node;

the main pipe carbon fiber cloth is provided with not less than six layers, the fiber directions are different, the fiber direction of the main pipe carbon fiber cloth is an angle formed relative to the bottom edge of the main pipe carbon fiber cloth, the main pipe carbon fiber cloth in the fiber direction of 0 degree or 90 degrees is pasted on the first layer, the main pipe carbon fiber cloth in the fiber direction of 45 degrees and-45 degrees is pasted between the main pipe carbon fiber cloth in the fiber direction of 0 degree and 90 degrees, for example [0 degree/45 degree/90 degrees ], the sum of the laying layers of 45 degrees and-45 degrees can be an odd number, and the sum of the laying layers of 0 degrees and 90 degrees is suggested to be an even number;

the stress of the 45-degree and-45-degree joint is obviously different, the enough layers of 0-degree and 90-degree are firstly ensured to be added, otherwise, the number of the layers of 45-degree and-45-degree pasting can be relatively reduced;

for construction convenience, the carbon fiber cloth of the main pipe can be adhered in double layers at the same angle, for example, 0 °/0 °/45 °/90 °/90 ° and 0 °/45 °/90 ° respectively from inside to outside, and the influence on the strength is not great;

in actual construction environment, the diameter-thickness ratio of the main pipe

The number of layers of the main pipe carbon fiber cloth is recommended to be adhered between 12 and 21, is not more than 15 and not less than 6;

when the number of the pasting layers exceeds 6, the following conditions are provided:

(1) paste 8 layers when being responsible for the carbon cloth, paste the fibre direction and do: [0 °/0 °/45 °/90 ° ] + [0 °/90 ° ],

for example:

[0°/0°/0°/45°/-45°/90°/90°/90°]

[0°/0°/45°/90°/-45°/0°/90°/90°]；

(2) when 10 layers of the main pipe carbon fiber cloth is pasted, the pasting fiber direction is as follows: [0 °/0 °/45 °/90 ° ] + [0 °/45 °/90 ° ],

for example:

[0°/0°/0°/45°/-45°/45°/90°/90°/90°]

(3) paste 11 layers when being responsible for the carbon cloth, paste the fibre direction and do: [0 °/0 °/45 °/90 °/90 ° ] + [0 °/90 ° ] + [0 °/90 ° ],

for example:

[0°/0°/0°/45°/-45°/90°/90°/90°/0°/90°]

[0°/0°/0°/0°/45°/-45°/90°/90°/90°/90°]

(4) when 12 layers of the main pipe carbon fiber cloth is pasted, the pasting fiber direction is as follows: [0 °/0 °/45 °/90 ° ] + [0 °/90 ° ]

(5) When 10 layers of the main pipe carbon fiber cloth is pasted, the pasting fiber direction is as follows:

[0°/0°/45°/-45°/90°/90°]+[0°/0°/45°/-45°/90° /90°]

[0°/0°/45°/-45°/90°/90°]+[0°/0°/0°/90°/90° /90°]

(6) when 13 layers of the main pipe carbon fiber cloth are pasted, the pasting fiber direction is as follows: [0 °/0 °/45 °/90 ° ] + [0 °/90 ° ] + [0 °/90 ° ] + [0 °/45 °/90 ° ] + [0 °/90 ° ])

(7) When 14 layers of the main pipe carbon fiber cloth are pasted, the pasting fiber direction is as follows: [0 °/0 °/45 °/90 ° ] + [0 °/90 ° ] + [0 °/90 ° ] + [0 °/90 ° ] + ])

[0°/0°/45°/-45°/90°/90°]+[0°/45°/90°]+[0° /45°/90°]+[0°/90°]

(8) Paste 15 layers when being responsible for the carbon cloth, paste the fibre direction and do: [0 °/0 °/45 °/90 ° ] + [0 °/90 ° ] + [0 °/90 ° ] + [0 °/45 ° ]/90 ° ] + [0 °/90 ° ] + [0 °/90 ° ] ]

[0°/0°/45°/-45°/90°/90°]+[0°/0°/0°/90°/90° /90°]+[0°/45°/90°]；

The branch carbon fiber cloth is also provided with at least six layers, the fiber directions are different, and the bottom edges of the branch carbon fiber cloth are sequentially 0 degree, 90 degrees, 0 degrees and 90 degrees from inside to outside;

the main pipe node main pipe is connected with the main pipe carbon fiber cloth through an adhesive, and each layer of the main pipe carbon fiber cloth is connected through an adhesive;

the steel pipe joint branch pipes are connected with the branch pipe carbon fiber cloth through adhesives, and each layer of branch pipe carbon fiber cloth is connected with each other through adhesives;

preferably: each layer of the main pipe carbon fiber cloth is rectangular cloth, one side of the rectangular cloth is provided with a rectangular notch, the notch is matched with the outer diameter of the steel pipe node branch pipe, and the direction of the notch is the same as the fiber direction of the main pipe carbon fiber cloth;

the side of the rectangular cloth provided with the rectangular notch is lapped with the opposite side of the rectangular cloth, so that a through hole matched with the steel pipe node branch pipe is formed in the side wall of the main pipe carbon fiber cloth when the main pipe carbon fiber cloth is wrapped into a cylindrical shape;

another preferred method is: each layer of main pipe carbon fiber cloth comprises two L-shaped main pipe carbon fiber cloth layers, the two L-shaped main pipe carbon fiber cloth layers are spliced into a rectangular main pipe carbon fiber cloth layer in an end-to-end mode, rectangular through holes are formed in the middle of each two L-shaped main pipe carbon fiber cloth layers, and the root parts of the steel pipe node branch pipes are arranged in the through holes;

l type is responsible for carbon cloth includes: topside, base, long limit, minor face and the limit of buckling, one of them the L type is responsible for topside and another be responsible for carbon cloth's base and be located same line and have the part to overlap, two be responsible for carbon cloth's the limit of buckling relative and have the part to overlap, two L type is responsible for carbon cloth's the limit of buckling middle part 90 degrees of buckling and forms the through-hole, the through-hole is square.

The method comprises the following steps: before the carbon fiber reinforced composite material is adhered, the surface of the steel pipe is subjected to rust removal treatment to ensure that the surface of the steel pipe is smooth, and according to the condition of an area to be reinforced, non-essential substances such as paint, oil stain, rust, welding seam coating and the like on the surface of the reinforced area are removed by adopting a certain tool and means, so that the natural color of metal is exposed; if the part to be reinforced is damaged by external force and collapses, leveling the part to be reinforced by adopting bottom resin and leveling material, and then brushing the bottom resin; coating impregnating resin on the area where the carbon fiber cloth is adhered, adhering protective glass fiber to ensure that no gas exists between layers, and coating the impregnating resin or adhering resin after the bottom layer glass fiber is dry by touch;

coating impregnating resin on the main pipe carbon fiber cloth, then aligning the notch position with the steel pipe node branch pipe, inserting, enabling the main pipe carbon fiber cloth to be attached to the steel pipe node main pipe, or directly attaching the main pipe carbon fiber cloth to a reinforcing area coated with the impregnating resin, ensuring that the impregnating resin fully permeates the carbon main pipe fiber cloth, slightly pressing the main pipe carbon fiber cloth to the reinforcing position by hand, rolling the main pipe carbon fiber cloth by hand or a special roller along the fiber direction of the carbon fiber cloth for multiple times, removing bubbles, and paying attention to the fact that the carbon fiber cloth is not damaged when rolling or removing the bubbles; continuously sticking main pipe carbon fiber cloth in different fiber directions to the outside of the main pipe of the steel pipe node according to the method;

after the main pipe carbon fiber cloth is pasted, two pieces of trapezoidal branch pipe carbon fiber cloth are selected according to the fiber direction and are pasted outside the steel pipe node branch pipes according to the method, so that the inclined edges of the trapezoidal branch pipe carbon fiber cloth are positioned at the bottom and are tightly attached to the main pipe carbon fiber cloth, and then the branch pipe carbon fiber cloth in different fiber directions is continuously pasted outside the steel pipe node branch pipes; after the rear main pipe and the branch pipe are well adhered, the main pipe carbon fiber cloth is wound with the main pipe carbon fiber material strips in the direction of 0 degree relative to the main pipe, the branch pipe carbon fiber material strips are wound with the branch pipe carbon fiber cloth in the direction of 0 degree relative to the branch pipe, and after the fibers are wound, the main pipe and the two ends of the branch pipe carbon fiber cloth are reinforced through the anchoring pressing strips.

The second method comprises the following steps: before the carbon fiber reinforced composite material is adhered, the surface of the steel pipe is subjected to rust removal treatment to ensure that the surface of the steel pipe is smooth, and according to the condition of an area to be reinforced, non-essential substances such as paint, oil stain, rust, welding seam coating and the like on the surface of the reinforced area are removed by adopting a certain tool and means, so that the natural color of metal is exposed; if the part to be reinforced is damaged by external force and collapses, leveling the part to be reinforced by adopting bottom resin and leveling material, and then brushing the bottom resin; coating impregnating resin on the area where the carbon fiber cloth is adhered, adhering protective glass fiber to ensure that no gas exists between layers, and coating the impregnating resin or adhering resin after the bottom layer glass fiber is dry by touch;

firstly, splicing two L-shaped main pipe carbon fiber cloths together according to the described shape to form a layer of rectangular main pipe carbon fiber cloth, leaving a rectangular through hole in the middle of the main pipe carbon fiber cloth, then coating impregnating resin on the carbon fiber cloth, or directly sticking the carbon fiber cloth on a reinforcing area coated with the impregnating resin, but ensuring that the impregnating resin fully permeates the carbon fiber cloth, lightly pressing the carbon fiber cloth to the reinforcing position by hand, rolling the carbon fiber cloth along the fiber direction of the carbon fiber cloth for multiple times by hand or a special roller, removing bubbles, and paying attention to the fact that the carbon fiber cloth is not damaged when rolling or removing the bubbles; continuously sticking main pipe carbon fiber cloth in different fiber directions to the outside of the main pipe of the steel pipe node according to the method;

after the main pipe carbon fiber cloth is pasted, two pieces of trapezoidal branch pipe carbon fiber cloth are selected according to the fiber direction and are pasted outside the steel pipe node branch pipes according to the method, so that the inclined edges of the trapezoidal branch pipe carbon fiber cloth are positioned at the bottom and are tightly attached to the main pipe carbon fiber cloth, and then the branch pipe carbon fiber cloth in different fiber directions is continuously pasted outside the steel pipe node branch pipes; after the rear main pipe and the branch pipe are well adhered, the main pipe carbon fiber cloth is wound with the main pipe carbon fiber material strips in the direction of 0 degree relative to the main pipe, the branch pipe carbon fiber material strips are wound with the branch pipe carbon fiber cloth in the direction of 0 degree relative to the branch pipe, and after the fibers are wound, the main pipe and the two ends of the branch pipe carbon fiber cloth are reinforced through the anchoring pressing strips.

The beneficial effects of the scheme can be known from the description of the scheme, the structure is simple, the design is reasonable, and the stability of the Y-shaped pipeline node can be enhanced; the construction is convenient, welding is not needed, the technical difficulty is small, the problems caused by improper welding in the construction and use process are avoided, the construction in a narrow space is facilitated, and the method is suitable for on-site repair; the carbon fiber reinforced composite material is selected as a reinforcing material, is a high-performance fiber composite material with light weight, high strength, high modulus and stable chemical performance, and can resist high temperature, corrosion and excellent thermodynamic performance;

the performance of the structural material is cut by designing the orientation and the dosage of the reinforced fibers, so that the performance can be optimized, the composite material has enough fiber orientation in the main stress direction to bear load, and has proper load in other directions to bear shearing load or other loads, so that the use efficiency of the material can be improved, the manufacturing procedure is simplified, and the manufacturing cost is reduced;

the carbon fiber cloth is conveniently provided with the rectangular notch, so that the carbon fiber cloth can be conveniently cut by an operator, the cutting is simple and convenient, and the time can be saved; each layer of main pipe carbon fiber cloth can be formed by splicing two L-shaped main pipe carbon fiber cloths, so that the main pipe carbon fiber cloth is convenient to cut and wrap, a rectangular through hole is reserved in the middle, the main pipe carbon fiber cloth can pass through the root of the branch pipe and can be bent to be tightly attached to the outer part of the main pipe, and bubbles and gaps are difficult to generate;

each layer of branch pipe carbon fiber cloth wrapped outside the branch pipe is formed by splicing two trapezoidal branch pipe carbon fiber cloths, the bottom edge of each branch pipe carbon fiber cloth is an inclined edge, the branch pipe carbon fiber cloths are cut according to the inclination angle of the branch pipe of the Y-shaped pipeline, the bottom edges of the trapezoidal branch pipe carbon fiber cloths and the main pipe outer carbon fiber cloth are tightly attached to form no gap, and the splicing positions of the two trapezoidal branch pipe carbon fiber cloths are provided with overlapping parts, so that the branch pipe carbon fiber cloths wrapped outside cannot generate gaps, and a reinforcing structure is stably and tightly attached; the branch pipe and the main pipe carbon fiber cloth are wrapped with carbon fiber strips, so that the nodes are further reinforced on the basis of reinforcing the carbon fiber cloth, the carbon fiber cloth is prevented from falling off, meanwhile, the two ends of the carbon fiber cloth are reinforced through anchoring pressing strips, and the falling off caused by the unstable adhesion of the composite material is also avoided;

the scheme does not need to drill the original structure, does not reduce the cross section area of the component, does not form a new stress concentration source, has no damage to the original cross section, is quick in reinforcing construction, short in period, can avoid or reduce production halt time, saves reinforcing materials, greatly saves the cost of reinforcing the carbon fiber composite material compared with other reinforcing methods, has high economic benefit, and can greatly improve the bearing capacity, the fatigue resistance, the corrosion resistance and the durability of the node; the stress concentration degree of the node is reduced, and the generation and development of cracks are relieved.

Drawings

Fig. 1 is a schematic laying diagram of the present invention;

fig. 2 is a schematic view of laying carbon fiber cloth in main pipe according to an embodiment of the present invention;

fig. 3 is a schematic view of a carbon fiber cloth according to an embodiment of the present invention;

fig. 4 is a schematic view of a carbon fiber cloth according to an embodiment of the present invention;

FIG. 5 is a schematic view of laying the branch carbon fiber cloth of the present invention;

FIG. 6 is a schematic view of the branch carbon fiber cloth of the present invention;

fig. 7 is a schematic view of laying the anchoring bead of the present invention.

Labeled as: 1. a steel pipe node main pipe; 2. steel pipe joint branch pipes; 3. a main pipe of carbon fiber cloth; 4. the L-shaped main pipe is made of carbon fiber cloth; 5. a through hole; 6. branch carbon fiber cloth; 7. cutting; 8. anchoring the batten; 9. a strip of carbon fiber material.

Detailed Description

In order to clearly explain the structural features of the present solution, the present solution is explained below by way of specific embodiments.

The first embodiment is as follows:

the embodiment is a carbon fiber repairing and reinforcing structure of a Y-shaped steel pipe structure, which comprises a steel pipe node main pipe 1, steel pipe node branch pipes 2 and a plurality of layers of carbon fiber reinforced composite materials, wherein the steel pipe node main pipe 1 and the steel pipe node branch pipes 2 are both cylindrical pipes;

the carbon fiber reinforced composite material comprises a plurality of layers of main pipe carbon fiber cloth 3 which wraps the outer wall of the main pipe 1 of the steel pipe node;

each layer of main pipe carbon fiber cloth 3 is rectangular cloth, one side of the rectangular cloth is provided with a rectangular notch 7, the notch 7 is matched with the outer diameter of the steel pipe node branch pipe 2, and the direction of the notch 7 is the same as the fiber direction of the main pipe carbon fiber cloth 3;

the sides of the rectangular cloth provided with the rectangular notches 7 are lapped with the opposite sides of the rectangular cloth, so that through holes 5 matched with the steel pipe node branch pipes are formed in the side walls of the main pipe carbon fiber cloth 3 when the main pipe carbon fiber cloth is wrapped into a cylindrical shape;

the main pipe carbon fiber cloth 3 is provided with not less than 6 layers, the fiber directions are different, the fiber direction of the main pipe carbon fiber cloth 3 is an angle formed relative to the bottom edge of the main pipe carbon fiber cloth 3, the main pipe carbon fiber cloth 3 in the fiber direction of 0 degree or 90 degrees is pasted on the first layer, and the main pipe carbon fiber cloth 3 in the fiber directions of 45 degrees and-45 degrees is pasted between the main pipe carbon fiber cloths 3 in the fiber directions of 0 degree and 90 degrees;

the steel pipe node main pipe 1 is connected with the main pipe carbon fiber cloth 3 through an adhesive, and each layer of main pipe carbon fiber cloth 3 is connected through an adhesive;

the carbon fiber reinforced composite material also comprises a plurality of layers of branch pipe carbon fiber cloth 6 wrapping the outer wall of the steel pipe node branch pipe 2, and each layer of branch pipe carbon fiber cloth 6 is provided with two pieces of trapezoidal carbon fiber cloth;

each layer of branch pipe carbon fiber cloth 6 is two pieces of trapezoid branch pipe carbon fiber cloth 6, the top edges of the two pieces of trapezoid branch pipe carbon fiber cloth 6 are perpendicular to the left side and the right side, and the bottom edges are inclined edges, wherein one piece of trapezoid branch pipe carbon fiber cloth 6 is wrapped on one side of the outer pipe wall of the steel pipe node branch pipe 2, the other piece of branch pipe carbon fiber cloth 6 is positioned on the other side of the outer pipe wall of the steel pipe node branch pipe 2, the bottom edges of the two pieces of trapezoid branch pipe carbon fiber cloth 6 are both positioned at the joint of the steel pipe node branch pipe 2 and the steel pipe node main pipe 1;

the branch carbon fiber cloth 6 is provided with at least six layers, the fiber directions are different, and the bottom edges of the branch carbon fiber cloth 6 are 0 degree, 90 degrees, 0 degrees and 90 degrees from inside to outside in sequence;

the steel pipe node branch pipes 2 are connected with the branch pipe carbon fiber cloth 6 through adhesives, and the branch pipe carbon fiber cloth 6 on each layer are connected through adhesives;

carbon fiber material strips 9 are arranged outside the branch pipe carbon fiber cloth 6 and the main pipe carbon fiber cloth 3, the winding direction of the main pipe carbon fiber material strips 9 is 0 degree compared with that of the main pipe 1 of the steel pipe node, and the winding direction of the branch pipe carbon fiber material strips 9 is 0 degree compared with that of the branch pipe 2 of the steel pipe node;

the connecting part of the outermost two ends of the main carbon fiber cloth 3 and the outer wall of the main steel pipe node 1 is provided with a plurality of layers of anchoring pressing strips 8, the connecting part of the outermost end of the branch carbon fiber cloth 6 and the outer wall of the branch pipe 2 of the steel pipe node is also provided with a plurality of layers of anchoring pressing strips 8, and the three layers of anchoring pressing strips 8 are arranged.

Before the carbon fiber reinforced composite material is adhered, the surface of the steel pipe is subjected to rust removal treatment to ensure that the surface of the steel pipe is smooth, and according to the condition of an area to be reinforced, non-essential substances such as paint, oil stain, rust, welding seam coating and the like on the surface of the reinforced area are removed by adopting a certain tool and means, so that the natural color of metal is exposed; if the part to be reinforced is damaged by external force and collapses, leveling the part to be reinforced by adopting bottom resin and leveling material, and then brushing the bottom resin; coating impregnating resin on the area where the carbon fiber cloth is adhered, adhering protective glass fiber to ensure that no gas exists between layers, and coating the impregnating resin or adhering resin after the bottom layer glass fiber is dry by touch;

firstly, the main pipe carbon fiber cloth 3 is adhered to the area of the main pipe 1 of the steel pipe joint, and the main pipe 1 of the steel pipe joint is reinforced by carbon fiber according to the laying sequence in table 1.

The simulated length Lcfrp1 is the failure length of the parent tube region +2 × 200 mm.

Calculating the failure position and length of the main pipe through finite element analysis, and respectively extending 200mm from two ends of the failure length to be used as the total length of the carbon fiber reinforced main pipe, namely Lcfrp1 is 600+2 multiplied by 200 is 1000 mm; based on the outer diameter of the main tube, the width of the main tube carbon fiber cloth 3 is 850 mm.

TABLE 1 laying sequence of carbon fiber reinforced main pipe

Coating impregnating resin on the main pipe carbon fiber cloth 3, then aligning the position of the notch 7 with the position of the steel pipe node branch pipe 2, inserting the main pipe carbon fiber cloth 3 on the steel pipe node main pipe 1, or directly sticking the main pipe carbon fiber cloth 3 on the reinforced area coated with the impregnating resin, but ensuring that the impregnating resin fully permeates the carbon main pipe fiber cloth, lightly pressing the main pipe carbon fiber cloth 3 on the reinforced position by hand, rolling the main pipe carbon fiber cloth 3 along the fiber direction of the carbon fiber cloth for a plurality of times by hand or a special roller, removing bubbles, and paying attention to the fact that the carbon fiber cloth is not damaged when rolling or removing the bubbles; continuously sticking main pipe carbon fiber cloth 3 with different fiber directions to the outside of the steel pipe node main pipe 1 according to the method;

after the main pipe carbon fiber cloth 3 is adhered, the main pipe is reinforced by carbon fibers according to the laying sequence in table 2 for the reinforcement of the steel pipe joint branch pipe 2. The reinforcing length Lcfrp2 of the branch pipe is more than or equal to le + d cot theta which is 120+95cot 84. 130mm and Lcfrp2 is 200 mm.

TABLE 2 laying sequence of carbon fiber reinforced branch pipes

Selecting two pieces of carbon fiber cloth 6 of the trapezoidal branch pipes according to the fiber direction, adhering the carbon fiber cloth 6 of the trapezoidal branch pipes to the outside of the steel pipe node branch pipe 2 according to the method, enabling the inclined edges of the carbon fiber cloth 6 of the trapezoidal branch pipes to be positioned at the bottom and to be tightly attached to the carbon fiber cloth 3 of the main pipe, and then continuously adhering the carbon fiber cloth 6 of the branch pipes in different fiber directions to the outside of the steel pipe node branch pipe; after the main pipe and the branch pipe are well adhered, the main pipe carbon fiber cloth 3 is wound with the main pipe carbon fiber material strips 9 in the direction of 0 degree relative to the main pipe, the branch pipe carbon fiber material strips 9 are wound with the branch pipe carbon fiber cloth 6 in the direction of 0 degree relative to the branch pipe, and after the fibers are wound, the main pipe and the two ends of the branch pipe carbon fiber cloth 6 are reinforced through the anchoring pressing strips 8, so that the adhesive joint of the carbon fibers and the steel is prevented from being degummed. Fig. 7 is a schematic diagram of carbon fiber anchoring, and according to the node size, the sizes of two types of pressing strips are cut to anchor different areas, wherein the widths of the pressing strips are respectively: lend 1-Lend 2-200 mm. The length of the pressing strip is 3 times of the perimeter of the corresponding pipe fitting respectively, in order to not influence the reinforcing effect, the carbon fiber cloth can be cut into 2 sections, the carbon fiber cloth is wound by one half circle around the pipe fitting every time, and the rest half part is wound after the glue is solidified.

Example two:

the embodiment is a carbon fiber repairing and reinforcing structure of a Y-shaped steel pipe structure, which comprises a steel pipe node main pipe 1, steel pipe node branch pipes 2 and a plurality of layers of carbon fiber reinforced composite materials, wherein the steel pipe node main pipe 1 and the steel pipe node branch pipes 2 are both cylindrical pipes;

the carbon fiber reinforced composite material comprises a plurality of layers of main pipe carbon fiber cloth 3 which wraps the outer wall of the main pipe 1 of the steel pipe node;

each layer of main pipe carbon fiber cloth 3 comprises two L-shaped main pipe carbon fiber cloths 4, the two L-shaped main pipe carbon fiber cloths are spliced end to form a rectangular main pipe carbon fiber cloth 3, a rectangular through hole 5 is formed in the middle of each two L-shaped main pipe carbon fiber cloths 4, and the root of the steel pipe node branch pipe 2 is arranged in each through hole 5;

the L-shaped main tube carbon fiber cloth 4 includes: topside, base, long limit, minor face and the limit of buckling, wherein the topside of the carbon fiber cloth 4 is responsible for to one L type and the base of another L type and be responsible for carbon fiber cloth 4 and be located same line and have the partial overlap, two L types are responsible for the limit of buckling of carbon fiber cloth 4 and are relative and have the partial overlap, and two L types are responsible for the limit of buckling middle part 90 of carbon fiber cloth 4 and are buckled and form through-hole 5, and through-hole 5 is square.

The main pipe carbon fiber cloth 3 is provided with not less than 6 layers, the fiber directions are different, the fiber direction of the main pipe carbon fiber cloth 3 is an angle formed relative to the bottom edge of the main pipe carbon fiber cloth 3, the main pipe carbon fiber cloth 3 in the fiber direction of 0 degree or 90 degrees is pasted on the first layer, and the main pipe carbon fiber cloth 3 in the fiber directions of 45 degrees and-45 degrees is pasted between the main pipe carbon fiber cloths 3 in the fiber directions of 0 degree and 90 degrees;

the steel pipe node main pipe 1 is connected with the main pipe carbon fiber cloth 3 through an adhesive, and each layer of main pipe carbon fiber cloth 3 is connected through an adhesive;

the carbon fiber reinforced composite material also comprises a plurality of layers of branch pipe carbon fiber cloth 6 wrapping the outer wall of the steel pipe node branch pipe 2, and each layer of branch pipe carbon fiber cloth 6 is provided with two pieces of trapezoidal carbon fiber cloth;

each layer of branch pipe carbon fiber cloth 6 is two pieces of trapezoid branch pipe carbon fiber cloth 6, the top edges of the two pieces of trapezoid branch pipe carbon fiber cloth 6 are perpendicular to the left side and the right side, and the bottom edges are inclined edges, wherein one piece of trapezoid branch pipe carbon fiber cloth 6 is wrapped on one side of the outer pipe wall of the steel pipe node branch pipe 2, the other piece of branch pipe carbon fiber cloth 6 is positioned on the other side of the outer pipe wall of the steel pipe node branch pipe 2, the bottom edges of the two pieces of trapezoid branch pipe carbon fiber cloth 6 are both positioned at the joint of the steel pipe node branch pipe 2 and the steel pipe node main pipe 1;

the branch carbon fiber cloth 6 is provided with at least six layers, the fiber directions are different, and the bottom edges of the branch carbon fiber cloth 6 are 0 degree, 90 degrees, 0 degrees and 90 degrees from inside to outside in sequence;

the steel pipe node branch pipes 2 are connected with the branch pipe carbon fiber cloth 6 through adhesives, and the branch pipe carbon fiber cloth 6 on each layer are connected through adhesives;

carbon fiber material strips 9 are arranged outside the branch pipe carbon fiber cloth 6 and the main pipe carbon fiber cloth 3, the winding direction of the main pipe carbon fiber material strips 9 is 0 degree compared with that of the main pipe 1 of the steel pipe node, and the winding direction of the branch pipe carbon fiber material strips 9 is 0 degree compared with that of the branch pipe 2 of the steel pipe node;

the connecting part of the outermost two ends of the main carbon fiber cloth 3 and the outer wall of the main steel pipe node 1 is provided with a plurality of layers of anchoring pressing strips 8, the connecting part of the outermost end of the branch carbon fiber cloth 6 and the outer wall of the branch pipe 2 of the steel pipe node is also provided with a plurality of layers of anchoring pressing strips 8, and the three layers of anchoring pressing strips 8 are arranged.

Before the carbon fiber reinforced composite material is adhered, the surface of the steel pipe is subjected to rust removal treatment to ensure that the surface of the steel pipe is smooth, and according to the condition of an area to be reinforced, non-essential substances such as paint, oil stain, rust, welding seam coating and the like on the surface of the reinforced area are removed by adopting a certain tool and means, so that the natural color of metal is exposed; if the part to be reinforced is damaged by external force and collapses, leveling the part to be reinforced by adopting bottom resin and leveling material, and then brushing the bottom resin; coating impregnating resin on the area where the carbon fiber cloth is adhered, adhering protective glass fiber to ensure that no gas exists between layers, and coating the impregnating resin or adhering resin after the bottom layer glass fiber is dry by touch;

firstly, the main pipe carbon fiber cloth 3 is adhered to the area of the main pipe 1 of the steel pipe joint, and the main pipe 1 of the steel pipe joint is reinforced by carbon fiber according to the laying sequence in table 1.

The simulated length Lcfrp1 is the failure length of the parent tube region +2 × 200 mm.

Calculating the failure position and length of the main pipe through finite element analysis, and respectively extending 200mm from two ends of the failure length to be used as the total length of the carbon fiber reinforced main pipe, namely Lcfrp1 is 600+2 multiplied by 200 is 1000 mm; based on the outer diameter of the main tube, the width of the main tube carbon fiber cloth 3 is 850 mm.

TABLE 1 laying sequence of carbon fiber reinforced main pipe

Firstly, splicing two L-shaped main pipe carbon fiber cloths 4 together according to the described shape to form a layer of rectangular main pipe carbon fiber cloth 3, leaving a rectangular through hole 5 in the middle, then coating impregnating resin on the carbon fiber cloth, or directly sticking the carbon fiber cloth on a reinforcing area coated with the impregnating resin, but ensuring that the impregnating resin fully permeates the carbon fiber cloth, lightly pressing the carbon fiber cloth on the reinforcing position by hand, rolling the carbon fiber cloth along the fiber direction of the carbon fiber cloth for multiple times by hand or a special roller, removing bubbles, and paying attention to the fact that the carbon fiber cloth is not damaged when rolling or removing the bubbles; continuously sticking main pipe carbon fiber cloth 3 with different fiber directions to the outside of the steel pipe node main pipe 1 according to the method;

after the main pipe carbon fiber cloth 3 is adhered, and then the main pipe is reinforced by carbon fibers according to the laying sequence in table 2 for the reinforcement of the steel pipe node branch pipe 2. The reinforcing length Lcfrp2 of the branch pipe is more than or equal to le + d cot theta which is 120+95cot 84. 130mm and Lcfrp2 is 200 mm.

TABLE 2 laying sequence of carbon fiber reinforced branch pipes

Selecting two pieces of carbon fiber cloth 6 of the trapezoidal branch pipes according to the fiber direction, adhering the carbon fiber cloth 6 of the trapezoidal branch pipes to the outside of the steel pipe node branch pipe 2 according to the method, enabling the inclined edges of the carbon fiber cloth 6 of the trapezoidal branch pipes to be positioned at the bottom and to be tightly attached to the carbon fiber cloth 3 of the main pipe, and then continuously adhering the carbon fiber cloth 6 of the branch pipes in different fiber directions to the outside of the steel pipe node branch pipe; after the main pipe and the branch pipe are well adhered, the main pipe carbon fiber cloth 3 is wound with the main pipe carbon fiber material strips 9 in the direction of 0 degree relative to the main pipe, the branch pipe carbon fiber material strips 9 are wound with the branch pipe carbon fiber cloth 6 in the direction of 0 degree relative to the branch pipe, and after the fibers are wound, the main pipe and the two ends of the branch pipe carbon fiber cloth 6 are reinforced through the anchoring pressing strips 8, so that the adhesive joint of the carbon fibers and the steel is prevented from being degummed. Fig. 7 is a schematic diagram of carbon fiber anchoring, and according to the node size, the sizes of two types of pressing strips are cut to anchor different areas, wherein the widths of the pressing strips are respectively: lend 1-Lend 2-200 mm. The length of the pressing strip is 3 times of the perimeter of the corresponding pipe fitting respectively, in order to not influence the reinforcing effect, the carbon fiber cloth can be cut into 2 sections, the carbon fiber cloth is wound by one half circle around the pipe fitting every time, and the rest half part is wound after the glue is solidified.

The utility model discloses the not structural feature that describes can be through or adopt current structure to realize, no longer gives unnecessary details here, and of course, the above-mentioned explanation is not right the utility model discloses a restriction, the utility model discloses also not only be limited to the above-mentioned example, ordinary structure personnel in this structural domain are in the utility model discloses a change, modification, interpolation or replacement made in the essential scope also should belong to the utility model discloses a protection scope.

Claims (10)

1. A carbon fiber repairing and reinforcing structure of a Y-shaped steel pipe structure comprises a steel pipe node main pipe and a steel pipe node branch pipe, wherein the steel pipe node main pipe and the steel pipe node branch pipe are both cylindrical pipes,

comprises a plurality of layers of carbon fiber reinforced composite materials,

the carbon fiber reinforced composite material comprises a plurality of layers of main pipe carbon fiber cloth wrapped on the outer wall of the main pipe of the steel pipe node;

the carbon fiber reinforced composite material also comprises a plurality of layers of branch pipe carbon fiber cloth wrapped on the outer wall of the steel pipe node branch pipe, and each layer of branch pipe carbon fiber cloth is provided with two pieces of trapezoidal carbon fiber cloth;

carbon fiber material strips are arranged outside the branch pipe carbon fiber cloth and the main pipe carbon fiber cloth;

the outer end of the outmost end of the carbon fiber cloth of the main pipe is connected with the outer wall of the main pipe of the steel pipe node, and a plurality of layers of anchoring pressing strips are arranged at the connection position of the outmost end of the carbon fiber cloth of the branch pipe and the outer wall of the branch pipe of the steel pipe node.

2. The carbon fiber repairing and reinforcing structure of the Y-shaped steel tube structure as claimed in claim 1, wherein each layer of the main tube carbon fiber cloth is rectangular cloth, and a rectangular notch is formed in one side of the rectangular cloth and is matched with the outer diameter of the steel tube node branch tube;

the side of the rectangular cloth provided with the rectangular notch is lapped with the opposite side of the rectangular cloth, so that a through hole matched with the steel pipe node branch pipe is formed in the side wall of the main pipe carbon fiber cloth when the main pipe carbon fiber cloth is wrapped into a cylindrical shape;

the width of the main pipe carbon fiber cloth is larger than the diameter of the main pipe of the steel pipe node.

3. The carbon fiber repairing and reinforcing structure of the Y-shaped steel tube structure as claimed in claim 1, wherein each layer of the main tube carbon fiber cloth comprises two L-shaped main tube carbon fiber cloths, the two L-shaped main tube carbon fiber cloths are spliced into one rectangular main tube carbon fiber cloth in an end-to-end manner, and a rectangular through hole is formed in the middle of each two L-shaped main tube carbon fiber cloths;

the width of the main pipe carbon fiber cloth is not more than the diameter of the main pipe of the steel pipe node;

the root of the steel pipe joint branch pipe is arranged in the through hole.

4. The carbon fiber repairing and reinforcing structure of the Y-shaped steel tube structure as claimed in claim 3, wherein the L-shaped main tube carbon fiber cloth comprises: topside, base, long limit, minor face and the limit of buckling, one of them the L type is responsible for topside and another be responsible for carbon cloth's base and be located same line and have the part to overlap, two be responsible for carbon cloth's the limit of buckling relative and have the part to overlap, two L type is responsible for carbon cloth's the limit of buckling middle part 90 degrees of buckling and forms the through-hole, the through-hole is square.

5. The carbon fiber repairing and reinforcing structure of the Y-shaped steel tube structure as claimed in claim 1, wherein each layer of branch carbon fiber cloth is two pieces of trapezoidal branch carbon fiber cloth, the top edges of the two pieces of trapezoidal branch carbon fiber cloth are perpendicular to the left and right sides, and the bottom edges are oblique edges, one of the trapezoidal branch carbon fiber cloth is wrapped on one side of the outer tube wall of the steel tube node branch tube, the other piece of branch carbon fiber cloth is located on the other side of the outer tube wall of the steel tube node branch tube, the bottom edges of the two pieces of trapezoidal branch carbon fiber cloth are located at the joint of the steel tube node branch tube and the steel tube node main tube, and an overlapping portion is arranged between the two pieces of branch carbon fiber cloth.

6. The carbon fiber repairing and reinforcing structure of the Y-shaped steel tube structure as claimed in claim 1, wherein the main tube carbon fiber cloth is provided with not less than six layers, and the fiber directions are different, the fiber direction of the main tube carbon fiber cloth is an angle formed with respect to the bottom edge of the main tube carbon fiber cloth, the main tube carbon fiber cloth in the 0 ° or 90 ° fiber direction is pasted on the first layer, and the main tube carbon fiber cloth in the 45 ° or-45 ° fiber direction is pasted between the main tube carbon fiber cloth in the 0 ° or 90 ° fiber direction;

the branch carbon fiber cloth is also provided with at least six layers, the fiber directions are different, and the bottom edges of the branch carbon fiber cloth are sequentially 0 degrees, 90 degrees, 0 degrees and 90 degrees from inside to outside.

7. The carbon fiber repair reinforcement structure of the Y-shaped steel tube structure according to claim 2, wherein the direction of the cut is the same as the direction of the fibers of the main tube carbon fiber cloth.

8. The carbon fiber repairing and reinforcing structure of the Y-shaped steel tube structure as claimed in claim 1, wherein the winding direction of the main tube carbon fiber material strip is 0 degree compared with the main tube of the steel tube node;

the branch pipe carbon fiber material strip is compared the winding direction of the steel pipe node branch pipe is 0 degree.

9. The carbon fiber repairing and reinforcing structure of the Y-shaped steel pipe structure as claimed in claim 1, wherein the anchoring beads are provided with three layers.

10. The carbon fiber repairing and reinforcing structure of the Y-shaped steel tube structure as claimed in claim 1, wherein the main tube of the steel tube node is connected with the main tube of the carbon fiber cloth through an adhesive, and each layer of the main tube of the carbon fiber cloth is connected with each other through an adhesive;

the steel pipe joint branch pipe is connected with the branch pipe carbon fiber cloth through an adhesive, and each layer of branch pipe carbon fiber cloth is connected with each other through an adhesive.

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