CN113585628A

CN113585628A - Carbon fiber inhaul cable capable of being used for large building structure

Info

Publication number: CN113585628A
Application number: CN202110820860.XA
Authority: CN
Inventors: 卓静; 张永辉; 张道华; 陈波; 田国昌
Original assignee: Chongqing Dali Cable Technology Co ltd
Current assignee: Chongqing Dali Cable Technology Co ltd
Priority date: 2021-07-20
Filing date: 2021-07-20
Publication date: 2021-11-02

Abstract

The invention relates to a carbon fiber inhaul cable capable of being used for a large-scale building structure, which comprises a cable body and a plastic pipe protective sleeve, wherein the cable body is formed by stacking a plurality of carbon fiber plates with the same width in parallel and has a rectangular cross section, and the plastic pipe protective sleeve is sleeved outside the cable body. The cable body has the advantages of small section, high strength, easy installation and anchoring, excellent tensile property, simple production process, easy installation and construction, long service life and higher comprehensive cost performance, can be used for large-scale building structures, and has the capability of replacing steel cables under the policy background of carbon neutralization.

Description

Carbon fiber inhaul cable capable of being used for large building structure

Technical Field

The disclosure relates to a reinforcement for fixing a building, in particular to a carbon fiber inhaul cable for a large building structure.

Background

The statements in this section merely provide background information related to the present disclosure and may constitute prior art. In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art.

With the development of science and technology, large projects are made larger and larger. In China, the infrastructure scale is leading in the world, the guy cable applied to large-scale engineering has huge requirements, the construction cost of the structural guy cable is high, and the market scale is difficult to estimate. While more than 85% of large engineering structures are dead weights, the huge weight means high load, high seismic response and high cost of the structure. At present, the guy cables of large buildings all adopt steel cables. The steel cable is used as a cable for a traditional structure, and is commonly used for bridge inhaul cables, steel structure external cables and the like. However, the service life of the steel cable is greatly influenced by the environment, the steel cable sheath is easy to age and damage, the steel cable is seriously corroded in a humid and corrosive environment, and a plurality of structures in the engineering cause great life and property loss due to corrosion and breakage of the steel cable; the durability of the steel cable is greatly reduced, the designed service life cannot be reached, and the structural safety is influenced; the dead weight is great, and transportation and installation are relatively more difficult, and the large-scale equipment that needs to match with it cooperates the construction, and the construction cycle is long, and construction cost is high. The cost of post-maintenance is also high. Due to the material characteristics of steel, the specific gravity of the steel cable is large, which limits the ultimate span and the bearing efficiency of the steel cable system bridge.

Because the steel cable has the defects, a product which can replace the steel cable is urgently needed in the market, and the defects of the steel cable are overcome so as to meet the application requirements of the market. With the advancement of technology, some products are available on the market to replace steel cables, such as:

fiber ropes made of the super polyolefin filaments have tensile strength comparable to steel wires or even higher, but are inferior to steel cords in abrasion resistance and heat resistance.

The fiber rope made of the high molecular compound has the characteristics of high strength, corrosion resistance, wear resistance and portability, but the stability is inferior to that of a steel rope.

Compared with a steel cable, the density of the carbon fiber cable (CFRP cable) is about 1/5 of the density of the steel cable, and the tensile strength is obviously higher than that of the steel cable, so that the characteristics of light weight and high strength are very outstanding; the modulus of elasticity is equivalent to that of a closed steel rope, but the strong modulus ratio of the steel rope is obviously higher than that of the steel rope, so that the CFRP stay rope can realize the bearing capacity which is equivalent to that of the steel rope with smaller axial rigidity; the corrosion resistance, fatigue resistance and creep resistance are also better than those of the steel rope, and the linear expansion coefficient is only 1/10 of the steel rope. Therefore, carbon fiber reinforced composite materials (carbon fiber composite materials for short) have the advantages of light weight, high strength, corrosion resistance, fatigue resistance and the like, and are increasingly known and determined along with the continuous development of research and engineering practice in the last decades.

For example, in patent application No. CN201020289723.5 entitled "carbon fiber rope", a cable made of large-tow carbon fibers is used, which is formed by twisting a plurality of single-strand ropes made of carbon fibers, each of which has a circular or oval cross section. Is formed by twisting three or seven single-strand ropes. The cable has the advantages of high strength and modulus, low density, good corrosion resistance, low expansion coefficient, good high-temperature creep resistance, low friction coefficient, self-lubrication and high conductivity. It has tensile modulus higher than that of steel material and several times of tensile strength, and also has the weaving performance of fiber. For another example, in patent application No. CN201711428402.1 entitled "a carbon fiber rope", a carbon fiber rope made of multiple materials mixed and braided includes carbon fiber filaments, ceramic fiber filaments, and basalt fiber filaments, and then carbon fiber ropes are formed by stranding carbon fiber tows, ceramic fiber tows, and basalt fiber tows; the cable has the advantages of high strength and modulus, low density, good corrosion resistance, low expansion coefficient, good high-temperature creep resistance, small friction coefficient, self-lubrication and high conductivity.

It follows that carbon fibre cables hold great promise in the future as a replacement for steel cables for large building structures. However, since the physical shapes of the two patents are both in a round bar shape, carbon fibers are easily damaged under pressure during anchoring, and the anchor is expensive in manufacturing cost, high in construction difficulty and low in anchor clamping force, so that the engineering quality is unstable.

In order to overcome the defects of the round bar-shaped carbon fiber cable, the patent with the application number of CN112064504A named as a self-anchored carbon fiber cable adopts a carbon fiber cable body made of winding type carbon fiber cloth. The cable body solves the problems of anchoring and stability to a certain extent, but the cable body is a multi-layer carbon fiber cable body formed by sequentially laminating and curing unidirectional carbon fiber prepregs, the provided tension is only dozens of tons, the tension level far below thousands of tons of hundreds of tons of steel cables cannot be achieved, and the application requirement of a large engineering structure cannot be met. And based on the product of the invention, the belt cable needs to use prepreg, the length can not be too long, at most ten meters, and the length of the cable can not be too long, so that the application range is also limited greatly, and the general requirement of large-scale engineering on the length can not be met. And the anchor and the cable body are high in cost and are not beneficial to application and popularization in practical engineering.

In order to solve the problem of insufficient tension of a winding type carbon fiber cable body, the application number CN111021631A entitled "a round section multilayer sheet type CFRP cable system" discloses a round section multilayer sheet type CFRP cable, which is formed by stacking CFRP sheets and foam sheets at intervals into a round section cable body 4. The round-section cable body 4 is sandwiched between the upper and

lower clamping plates

5, 6 and the clamping pieces, and is anchored by a fastening bolt 8 and a nut 9, as shown in fig. 3 or 4. In order to obtain a circular cross-section, 15 layers of carbon fiber plates of different widths and 16 layers of polyurethane foam plates of different widths were stacked. Compared with a common round bar type carbon fiber inhaul cable, the anchor is relatively scientific, a common anchor can be adopted, and the cost is lower.

As the applicant of the patent and the above patent application are related units, the inventor finds that the circular-section CFRP inhaul cable is easy to have the condition that the middle carbon fiber plate slides out during the fastening of the anchorage device in the practical use and experimental tests of the patent product, so that the anchorage can not be realized; moreover, the upper and lower pressure plates are easy to bend and deform seriously when the bolt is fastened, so that the fastening bolt also bends and deforms, the shapes of the anchor head and the bolt are changed, the whole stress is very adverse, the service life of the anchor head is influenced, and further the engineering quality and the engineering service life are influenced; the load-bearing capacity/working performance of the guy cable is not ideal, and the guy cable is difficult to apply to a large building structure. Because the carbon fiber plates with different widths are adopted for being superposed for combining the carbon fiber plates into the circular section, the specification of the sheet is more complex, and the production, the transportation and the assembly are more difficult.

In summary, the main reason why the guy cable of the same kind of products cannot be applied to the large building structure in terms of tensile strength is that the used cable body makes the anchoring design extremely difficult, cannot realize larger tensile force, and cannot meet the requirements of large engineering; in the service life, similar products have defects in the aspects of strength, corrosion resistance, ultraviolet resistance and the like, for example, the theoretical service life of the steel cable applied to a large building structure at present is 20 years, the theoretical service life is greatly reduced in practical application, some steel cables are not available for 5 years, long-term regular maintenance is needed, and the maintenance cost is high; in the manufacturing process and the installation process, the problems of difficult assembly, transportation, construction and the like exist, and the material mechanical loss is caused by the process defects; in terms of maintenance, it is troublesome.

Therefore, the fiber inhaul cable which is applied to engineering projects in the market at present has a relatively narrow application range, low tonnage, high manufacturing cost and difficult construction, only stays in a theoretical and academic level at present, and has no practicability and popularization, and particularly in the field of large building structures, no practical application case exists at present.

Disclosure of Invention

In view of the above problems, it is an object of the present invention to solve some of the problems of the prior art, or at least to alleviate them.

A carbon fiber inhaul cable for a large building structure comprises a cable body, a cable body and a cable body, wherein the cable body comprises a plurality of carbon fiber plates with the same width; the carbon fiber plates are stacked in parallel to form the cable body.

Further, the plurality of carbon fiber plates are closely stacked.

Further, the lengths of the carbon fiber plates are consistent.

The carbon fiber inhaul cable can be used for a large building structure, and further comprises a rectangular sheath sleeved outside the cable body.

Further, the sheath is constructed of plastic.

Media can be added between the carbon fiber plates.

The invention has the following beneficial effects:

1. the cable body with the rectangular cross section is stacked by adopting a plurality of carbon fiber plates with the same width, so that enough anchoring area can be provided during anchoring, the tensile capacity of each sheet is uniform, enough tension can be generated by anchoring, the requirement of design on cable force is easily met, and the service life and the engineering quality are ensured;

2. the method only needs to superpose the sheets with the same specification, and brings more convenience to production, transportation and assembly;

3. the carbon fiber plates are closely stacked, impurities such as air and water cannot be doped, and the corrosion resistance and the ageing resistance are obvious.

Drawings

FIG. 1 is a schematic view of a pull cable of the present invention;

FIG. 2 is a top view of the cable and anchor connection of the present invention;

FIG. 3 is a schematic view of a multi-layer sheet type CFRP stay cable with a round section after being fastened with an anchorage device;

FIG. 4 is a schematic view of a multi-layer sheet type CFRP stay cable with a circular cross section before being fastened with an anchorage device;

FIG. 5 is a cross-sectional view of a round cross-section multi-layer sheet type CFRP cable when anchored without a force;

FIG. 6 is a cross-sectional view of a round section multi-layer sheet type CFRP cable under stress when anchored;

FIG. 7 is a cross-sectional view of the stay cable of the present invention under stress during anchoring

FIG. 8 is a schematic view of the rope body of a 1570-stage closed steel rope;

FIG. 9 is a schematic diagram of the cable body of Mitsubishi leader parallel rod cable;

FIG. 10 is a schematic diagram of a cable body of a Tokyo Cable CFCC lay cable (continuous fiber reinforced ceramic matrix composite);

FIG. 11 is a cross-sectional schematic view of a steel cable body;

fig. 12 is a schematic cross-sectional view of a bar-type stay cable body.

Wherein: 1-carbon fiber plate; 2-a cable body; 3-a sheath; 4-a round section cable body; 5, an upper splint; 6-lower splint; 7-a clamping piece; 8-fastening bolts; 9-a nut; 11-carbon fiber sheet; 12-outermost carbon fiber sheet; 13-middle layer carbon fiber plate.

Detailed Description

The present invention will be further described with reference to the accompanying drawings, wherein the embodiments of the present invention are provided for illustrative purpose only and not for limiting the invention, and various alternatives and modifications can be made without departing from the technical spirit of the invention, according to the common technical knowledge and conventional means in the art.

One, experiment one

The inventors have conducted intensive experimental studies with respect to the defect of application No. CN111021631A entitled "a circular section multilayer sheet type CFRP cable system".

As shown in fig. 3 or 4 or 5, a circular cross-section CFRP cord body, 20mm in outer diameter, was used, which was stacked with five carbon fiber sheets 11 and four foam sheets.

1. Experimental data

A. Sheet specification: 19.9 × 1 layers, 17.3 × 2 layers, 7.8 × 2 layers. (3 different widths, regardless of jacket thickness)

B. Nominal cross-sectional area of circular cross-section cord: 3.14X 10²＝314mm²

C. Actual area of carbon fiber: 1 × 19.9 × 2+2 × 17.3 × 2+2 × 7.8 × 2 ═ 140.2mm²

D. Area efficiency: 140.2 ÷ 314 ÷ 44.6%

E. The standard strength of the carbon fiber plate 1 is calculated according to 2400MPa, and the bearing capacity of the round-section inhaul cable is as follows:

140.2×2400＝336.48×10³N

F. testing tension force by experiment: 82.3kN

2. Analysis of experiments

Experiments prove that the round-section cable body has larger design defects in application, and mainly comprises the following points:

A. the effective sectional area of the cable body is less than 50 percent, and the effective use area is small.

B. Because of outmost carbon fiber board 12 (indicate the superiors and the lowest floor) width is less, when upper and lower clamp plate extrusion fastening, the upper and lower clamp plate itself can take place great deformation, as shown in fig. 6, thereby make the carbon fiber board atress of other inside layers inhomogeneous, for example to middle level carbon fiber board 13, its extrusion force that receives middle part is great, the edge is less, such extrusion mode causes the splitting of carbon fiber board to destroy very easily (probably just cause the splitting of carbon fiber board even during the fastening), middle carbon fiber board is the easy roll-off after the splitting destroys, can't realize the anchor.

C. For the middle clamping pieces 7 (except for the upper pressing plate and the lower pressing plate), because the force transmitted by the fastening bolts 8 is small and uneven, the stress of the clamping pieces 7 is also large in the middle and small or even no stress exists on two sides.

D. The upper and lower pressing plates have large bending deformation during bolt fastening, so that the fastening bolts also have bending deformation, the shapes of the anchor heads and the bolts are changed, and as shown in fig. 6, the whole stress is very adverse, the service life of the anchor heads is influenced, and further the engineering quality and the engineering service life are influenced.

Description of the drawings: for the convenience of experimental comparison, the experiment adopted a rope body of five layers of carbon fiber sheets 11. In practical application, due to the fact that the requirement for cable force is high, a cable body with a larger cross section area is adopted, namely the number of layers of the carbon fiber sheets is increased, and obviously, the design defect of the carbon fiber sheet is more obvious.

3. Summary of the experiments

The cable body of the CFRP inhaul cable with the circular cross section is made of sheets with different specifications, so that the anchor device is easy to deform a pressing plate and a bolt of an anchor head when being pressurized, the design, the installation and the maintenance are more difficult, and greater potential quality hazards are left.

The cable body of the CFRP stay cable with the circular cross section can not provide enough anchoring area when being anchored, and the uneven stress of each sheet material is easy to split, so that the enough tension can not be generated after the anchoring, and the bearing capacity of the stay cable can not meet the design requirement.

The foam sheets among the carbon fiber sheets are easy to age, can be hardened, shrunk, deformed and the like, so that gaps are generated in the structure of the inhaul cable, corrosive media or harmful impurities can easily enter the gaps, and the appearance and the service life of the inhaul cable can be reduced.

In certain applications, it is desirable to improve the working coordination within the cable or to provide greater cable force, and sometimes to bond the sheets so that they are constrained to bear against each other. Obviously, the carbon fiber sheet of circular cross section cable can't bond because of the isolation of foam sheet, also can't retrain each other and form whole atress, has reduced the bearing capacity or the working property of cable, can only be through the quantity that increases carbon fiber sheet 11 for circular cross section is bigger and bigger. The larger the circular section is, the more sheets are, the greater the difficulty in design, installation and maintenance is, and the negative effect of the extrusion at the anchor head is multiplied, so that the service life and the engineering quality are influenced.

It is experimentally known that the above-mentioned drawbacks of the CFRP cable with circular section are all due to the fact that it is intended to obtain a cable with circular section. In fact, the guy cables on the market, whether large or small, whether made of steel or other new materials, including CFRP guy cables, are all round-bar shaped in physical shape and are all round or oval in cross-section. The 1570 grade closed steel cord as shown in FIG. 8, or Mitsubishi leader line parallel rod cord as shown in FIG. 9, or Tokyo cable CFCC stranded cord (continuous fiber reinforced ceramic matrix composite) as shown in FIG. 10, all have a circular cross section as shown in FIG. 11 or FIG. 12, or an oval cross section. In the past industrialization process, the round bar-shaped stay cable meets the application requirements in the fields of life, industry, building and the like, and the round section becomes a natural idea defined by the stay cable design convention. The guy cable used for large building structures needs to obtain huge pulling force, namely needs to be tensioned strongly. The material properties of steel allow strong extrusion for greater tension during anchoring, so the cables used in large building structures are still round in cross-section.

In the traditional construction technology, the inhaul cable is anchored from the surface and is strongly extruded from outside to inside, and the material property of steel allows strong pressurization. The design concept of the CFRP inhaul cable on the market at present still follows the traditional method of a circular section. The carbon fiber composite material is destructive by adopting the traditional anchoring method due to the special material characteristics, and if the carbon fiber material is not damaged, strong extrusion cannot be carried out, so that higher tension cannot be obtained obviously. Therefore, the traditional anchoring technology is applied to CFRP inhaul cables, cannot meet the mechanical requirements of large building structures, and can only be applied to the industrial field or small building structures at present. The CFRP guy cable is applied to a large building structure and is a brand-new subject, and no thinking set path for walking out the round bar-shaped guy cable exists at present due to habitual thinking of engineering technicians. This is also the reason why the cable of application No. CN111021631A entitled "a round section multilayer sheet type CFRP cable system" is still stacked into a round section cable by carbon fiber plates 1 of different widths.

However, the conventional means in the field is adopted, so that the round section inhaul cable of the patent generates a plurality of defects.

Second, experiment two

In order to solve the defects in the first experiment, as shown in fig. 1, a carbon fiber inhaul cable for a large building structure comprises a cable body 2; the cable body 2 comprises a plurality of carbon fiber plates 1 with the same width; the carbon fiber plates 1 are stacked in parallel to form the cable body 2.

The carbon fiber plates 1 are uniform in length.

As shown in fig. 1, the carbon fiber plate 1 is a strip-shaped sheet, and the length, width and height of the strip-shaped sheet can be designed according to application requirements. The common thickness is mainly 1.2mm, 1.5mm, 2mm and 3mm, the width is mainly 30mm, 50mm and 100mm, and the length is not limited.

The cable body 2 is formed by stacking carbon fiber plates 1 as shown in fig. 1, wherein when the carbon fiber plates 1 are blanked, the lengths of the carbon fiber plates are kept consistent, and the carbon fiber plates are overlapped in parallel to form the cable body 2 with a rectangular cross section.

As shown in fig. 1, the carbon fiber cable for large building structures further includes a rectangular sheath 3 sleeved outside the cable body 2. The sheath 3 is attached to the carbon fiber sheet 1 before installation after the carbon fiber sheet is stacked and molded into the cable body 2.

The sheath 3 is made of heat-shrinkable tubes made of plastics, and the plastics such as polyethylene, polypropylene and polyvinyl chloride can be selected according to different environments. The pyrocondensation pipe contracts when heating, plays the effect of fastening the cable body of cable, has functions such as waterproof, ultraviolet protection simultaneously, has protect function and pleasing to the eye characteristics concurrently. When in use, the diameter of the cable is more than 1.2 times of the width of the cable body.

The installation mode is as follows: the sleeve is sleeved like a sleeve, and then the hot air is blown by a hot air blower, so that the heat shrinkage pipe can shrink and tightly press the cable body. The sheath 3 and the cable body 2 are combined into a whole, so that the inhaul cable can be protected, and accidental damage can be avoided; water and impurities are effectively prevented from entering the cable body, and the corrosion resistance of the cable body is improved; effectively prevent ultraviolet rays from directly irradiating the cable body and improve the ageing resistance. The color of the sheath can be adjusted, the application requirements of customers are met, and the inhaul cable is more attractive.

The cable structure has a rectangular cross section, and is anchored as shown in fig. 2 or 7. The applicant performed the same experiment on the CFRP cable of the rectangular cross section according to the CFRP cable experiment of the circular cross section. For comparison, 5 carbon fiber sheets 1 were also used in this experiment.

1. Experimental data

A. Sheet specification: 20mm 10mm (5 layers of the same size, regardless of jacket thickness)

B. Nominal cross-sectional area of rectangular cross-section cable body: 20X 2X 5-200 mm²

C. Actual area of carbon fiber: 20X 2X 5-200 mm²(nominal cross-sectional area and actual area of carbon fiber are completely equal)

D. Area efficiency: 200 ÷ 100%

E. The standard strength of the carbon fiber plate 1 is calculated according to 2400MPa, and the bearing capacity of the rectangular-section inhaul cable is as follows:

200×2400＝480.0×10³N

F. testing tension force by experiment: 521.8kN

2. Comparison of Experimental data

A comparison of example one and example two is shown in the following table:

3. comparison of experimental analysis

In both embodiments, the nominal cross-sectional area of the rectangular section cord body is 200mm²The nominal cross-sectional area of the cable body with the circular cross-section is 314mm²To adoptWith the same strength of the carbon fiber sheet, the rectangular cross-section cord body obtained an actually measured breaking force of about 6 times in a smaller amount.

By comparison, the CFRP cable body with a rectangular cross section has obvious advantages in the application process compared with the CFRP cable body with a circular cross section, and mainly shows the following points:

A. the effective sectional area of the cable body is 100 percent, and the effective using area is more than 1 time of that of the cable body with the circular section.

B. Five layers of CFRP plates have the same specification, are uniformly stressed when being anchored, cannot be broken by the round section stay cable easily, ensure that any plate cannot slide out, and realize the reliable anchoring of the stay cable.

C. The force that fastening bolt 8 passed down during the anchor distributes evenly, the uneven condition of atress that the circular cross section cable appears easily can not appear, makes the cable satisfy bearing capacity's design requirement for a long time after the fastening.

D. When the bolt is fastened, the upper pressing plate, the lower pressing plate and the bolt cannot be bent or deformed, so that the structure of the anchor head is kept unchanged, the service lives of the inhaul cable and the end anchor head are prolonged, and the engineering quality and the engineering service life are guaranteed.

4. Summary of the application

Under the condition of the same cable force target, the round section cable needs a larger nominal section area, the larger section area means that more sheets need to be overlapped, the specification of the sheets is more complex, and the production, transportation and assembly are more difficult.

Under the condition of more layers of the round-section stay cable, the extrusion force of the upper and lower pressing plates can cause the extrusion damage of the uppermost and lowermost carbon fiber plates 1, as shown in fig. 6, the wider carbon fiber plates can also be damaged by splitting to a greater extent, the deformation of the upper and lower pressing plates and the bolts can be more serious, and greater potential quality hazards are caused. This is also the reason why the carbon fiber sheet 1 in the middle section easily slips out, resulting in non-anchoring. Description of the drawings: the narrow carbon fiber plate 1 fractures the next wide carbon fiber plate 1 by bearing the acting force, which is called splitting.

The cable body 2 of the CFRP stay cable with the rectangular cross section only needs to be overlapped by sheets with the same specification, so that the production, transportation and assembly are more convenient.

The cable body of the CFRP inhaul cable with the rectangular cross section can provide enough anchoring area when being anchored, the tensile capacity of each sheet is equal, the anchoring can generate enough tension, the requirement of design on cable force is easily met, and the service life and the engineering quality are ensured.

The carbon fiber plates 1 are in close contact with each other, air and water cannot be mixed, and the corrosion resistance and the ageing resistance are obvious.

Synthesize above-mentioned two experiments and know, the carbon fiber cable of rectangular cross section of this application has following apparent advantage for the carbon fiber cable of circular cross section:

firstly, after the rectangular cross section is adopted, the plane of the carbon fiber material is pressurized when the carbon fiber material is anchored, and the carbon fiber material is uniformly stressed, so that the carbon fiber material is not damaged;

secondly, a larger anchoring area can be obtained during anchoring, and the inhaul cable can be tensioned more tightly;

thirdly, the cable body 2 is layered and then anchored in multiple layers, the anchoring pressurization is still planar pressurization, and the carbon fiber is uniformly stressed, so that the material is prevented from being damaged, a doubled anchoring area is obtained, the inhaul cable obtains larger tension, the prestress requirement of a building structure is met, and the characteristics of the carbon fiber material with light weight and high strength are fully exerted.

Of course, the carbon fiber cable of the present application can be used in small buildings as well.

Due to the round section inhaul cable, gaps are easily generated between the carbon fiber plates due to aging and other reasons, and impurities such as condensed water are accumulated in the gaps to cause corrosion. Therefore, the rectangular-section cable body is formed by tightly stacking a plurality of carbon fiber plates 1 as shown in fig. 1, so that the cable body 2 has no gap, impurities such as condensed water cannot be accumulated in the gap, corrosion is caused, and the corrosion resistance and ageing resistance are obvious.

5. Special processing method for different application scenes

In practical applications, no special treatment is generally required between the plates. In some special scenarios, however, since the carbon fiber plates 1 can be stacked in multiple layers, media can be added between the carbon fiber plates 1 according to different application requirements. The following are some of the special treatment methods:

1) increase the bending performance of the cable body 2:

in an in vitro prestressed cable, it is often necessary to turn the cable, and therefore it is necessary for the cable to have good bendability. In order to reduce the additional stress during bending, lubricating agents such as butter and silicone oil can be coated between layers of the carbon fiber plate 1, so that the friction force between the layers is reduced, and the bending and steering performance of the inhaul cable is realized.

2) Increase the damping characteristic of the cable body 2:

in order to reduce the vibration of the cable, the damping characteristic of the cable needs to be improved, viscoelastic interface agents such as polycarbonate and polymethyl methacrylate can be added between layers of the carbon fiber plate 1, and the interface agents can assist the cable to absorb the energy of the vibration, greatly reduce the vibration amplitude of the cable and prolong the fatigue life of the cable.

3) Increasing the cable force of the cable body 2:

if can combine closely between the layer of carbon fiber plate 1, can improve the inside layer of cable and the cooperative working performance between the layer, the cable force of cable is promoted to whole. When the adhesive is used for bonding, the common adhesive is epoxy adhesive, alkyd resin and other high molecular compounds.

As can be seen from the above, the cable body 2 of the present application can be adapted to different environmental requirements by adding a corresponding adhesive or the like between the carbon fiber plates 1. This is also not possible with conventional guy wires of wire rope or other materials. Even if the application number CN111021631A is named as 'a round section multilayer sheet type CFRP cable system', because foam is arranged between the sheets, the additive substance can not play a corresponding role, and therefore the cable can not be improved according to the requirements of different environments.

Moreover, as can be seen from the above experiments, the carbon fiber cable of the present application has the following significant advantages:

1. the performance is excellent in tensile property. Compared with a steel cable, the carbon fiber plate 1 has equivalent bearing capacity with a steel strand, and can replace the steel strand under the same working condition in theory. Based on the cable body 2 created by the invention, a larger pulling force is achieved by the form of overlapping multiple layers of fiber plates, and a steel cable can be effectively replaced. Compared with the like products, the cable body is applied to the engineering structure under the high-strength requirement, and the application requirement of the large building structure is completely met.

2. In the production process, the carbon fiber plate 1 has only one specification, so the carbon fiber plate is simple to superpose and assemble. The product created based on the invention has low requirement on the production process, and the production line in the current market can meet the requirement of the production process.

3. In the aspect of transportation and assembly, compared with a steel cable, the steel cable achieves the same strength under the condition of the same working condition, the weight of the steel cable is 9.7 times that of a product created based on the steel cable, the huge weight of the steel cable means high load and high earthquake response of a structure, and besides great influence on the service life of a building structure, the other obvious defect is that the installation and construction difficulty is high. The product created based on the invention is beneficial to transportation and assembly.

4. In the aspect of application and construction, compared with similar products, the physical shape of the bar is a round bar shape, and the section of the bar is a round or oval shape. When the sectional area of the CFRP inhaul cable is the same as the anchoring length, the larger the section perimeter is, the larger the anchoring area is.

The anchoring area of the CFRP plate and the bar with the same cross section is about 3 times that of the CFRP plate and the bar. The layered anchoring of the invention ensures that the anchoring area is multiplied, and the effect is more obvious. The larger the anchoring area is, the larger the friction force or the cohesive force which can be generated is, the larger the anchoring bearing capacity is, and the CFRP plate is easier to anchor than the bar. Compared with CFRP (carbon fiber reinforced plastics) bars, the product disclosed by the invention can bear larger pressure without being damaged, and the plates and the matched clamps are anchored in a layered manner, so that each layer can be uniformly stressed, and the anchoring efficiency is higher; the composite material has the characteristics of strong tensile capacity, simple production process, high construction efficiency, small damage to materials and the like, and is beneficial to application and installation construction of large building structures.

5. In the service life of the product, the carbon fiber material used by the product has excellent corrosion resistance, and the section of the product is a non-porous rectangular section, so that the rainwater penetration is reduced, the air contact is reduced, and the corrosion is reduced. And the construction process has small damage to the material, strong durability and is beneficial to the structure safety. The stay cable is a full-life stay cable in the true sense and reaches the level of the same service life as the structure.

6. In terms of comprehensive cost performance, the comprehensive cost performance is far higher than that of the steel cable due to the reasons. Compared with the similar products, the method only has the possibility that the method is not applied to large building structures at present theoretically, and therefore the method is not comparable.

In conclusion, the cable body has the advantages of small section, high strength, convenience for installation and anchoring, excellent tensile property, simple production process, convenience for installation and construction, long service life and higher comprehensive cost performance, can be used for large-scale building structures, and has the capability of replacing the steel cable under the policy of carbon neutralization.

Claims

1. A carbon fiber cable usable for large building structures, comprising a cable body (2); the cable body (2) is characterized by comprising a plurality of carbon fiber plates (1) with the same width; the carbon fiber plates (1) are stacked in parallel to form the cable body (2).

2. Carbon fiber cable usable for large building structures according to claim 1, characterized in that said several carbon fiber plates (1) are closely stacked.

3. Carbon fiber cable usable in large building structures according to claim 2, characterized in that the several carbon fiber plates (1) are of uniform length.

4. Carbon fiber cable for large building structures according to claim 1, 2 or 3, characterized by further comprising a rectangular sheath (3) sleeved outside the cable body (2).

5. Carbon fibre cable usable for large building structures according to claim 4, characterized in that the sheath (3) is made of plastic.

6. Carbon fibre cable usable for large building structures according to claim 2, characterized in that media can be added between the carbon fibre plates (1).