Plug-in type parallel plate cable structure with replaceable cable body and manufacturing method

Abstract

The invention relates to the field of engineering material CFRP application, in particular to a cable body replaceable plug-in type parallel plate cable structure design and manufacturing method.The cable body replaceable plug-in type parallel plate cable structure comprises an anchor head and a parallel plate cable body, the anchor head comprises a stainless steel anchor core, the parallel plate cable body comprises a plurality of cable body carbon plates arranged in parallel, and the tail end of the anchor head is in butt joint with the end of one cable body carbon plate; thermoplastic carbon fiber prepregs and triaxial carbon plates are alternately arranged outside the stainless steel anchor core, the lap joint area of the thermoplastic carbon fiber prepregs and the cable body carbon plates is a bonding area, the ends of the thermoplastic carbon fiber prepregs extend to the bonding area and are located between the adjacent cable body carbon plates, the ends of the triaxial carbon plates are in butt joint with the ends of the cable body carbon plates, and the ends of the thermoplastic carbon fiber prepregs are in butt joint with the ends of the cable body carbon plates. The anchor cable has the following beneficial effects that the production difficulty is low, the anchoring efficiency is high, site construction operation is easy, and the single cable body can be replaced.

Description

Technical Field

[0001] The invention relates to the application field of engineering material CFRP, and in particular to a plug-in parallel plate cable structure design and a manufacturing method thereof with a replaceable cable body. Background Art

[0002] CFRP is a carbon fiber reinforced composite material. With the large-scale application of CFRP anchor cables in different projects in recent years, parallel plate cables, as one of the main forms of carbon fiber anchor cables, have been developed by major universities and companies into rich structural forms based on mechanical locking and interface bonding. These have greatly improved the problems of traditional metal cables, such as large size, heavy weight, complicated assembly, difficult transportation, installation and maintenance. They can not only provide designers with more structural options, but also reduce the difficulty of production. They have also brought many conveniences to the operation, construction, maintenance and other links involved in the project process, with obvious advantages.

[0003] Currently in the industry, the characteristics of plate cables are obvious: cables in the form of solid cables are limited by the difficulty in transportation and low anchoring efficiency, and cannot be used for large spans like rod cables; cables in the form of multi-layer plate cables are limited by the slippage and fatigue problems between the anchor end and the cable body under the action of long-term stress during the operation cycle, resulting in a short life cycle of the plate cables, frequent cable replacement, large project investment and high risk. Summary of the invention

[0004] The purpose of the present invention is to provide a plug-in parallel plate cable structure with replaceable cable body and a manufacturing method, which has the characteristics of low production difficulty, high anchoring efficiency, easy on-site construction operation, and replaceable single-piece cable body.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] A plug-in parallel plate cable structure with replaceable cable body comprises an anchor head and a parallel plate cable body, wherein the anchor head comprises a stainless steel anchor core, the parallel plate cable body comprises a plurality of cable body carbon plates arranged in parallel, the end of the anchor head is butted with the end of one of the cable body carbon plates, thermoplastic carbon fiber prepregs and triaxial carbon plates are alternately arranged outside the stainless steel anchor core, the overlapping area between the thermoplastic carbon fiber prepregs and the cable body carbon plates is a bonding area, the ends of the thermoplastic carbon fiber prepregs respectively extend to the bonding area and are located between adjacent cable body carbon plates, and the ends of the triaxial carbon plates are respectively butted with the ends of the cable body carbon plates.

[0007] Preferably, the end of the stainless steel anchor core has the same thickness as the carbon plate of the cable body.

[0008] Preferably, the thickness of the thermoplastic carbon fiber prepreg is half of the cable body carbon plate.

[0009] Preferably, pressure plates for fastening are provided above and below the bonding area.

[0010] Preferably, the cable body carbon plates use carbon plates of the same specification with consistent parameters such as straightness, resin content, and size.

[0011] Preferably, the triaxial carbon plate is pre-made of triaxial carbon cloth in the ±45° and 0° directions using a molding process, and the resin content, 0° single fiber direction, and thickness are consistent with those of the cable body carbon plate.

[0012] Preferably, the number of the cable body carbon plates is an odd number, the cable body carbon plate butted against the stainless steel anchor core is the central carbon plate, and the number of the cable body carbon plates distributed at the upper and lower ends is an even number and is symmetrically distributed.

[0013] Preferably, the ends of the thermoplastic carbon fiber prepreg are located in the area between the middle and right parts of the bonding area, and the ends of the thermoplastic carbon fiber prepreg are distributed in a V shape on both sides of the central carbon plate.

[0014] The manufacturing method of the plug-in parallel plate cable structure with replaceable cable body is to manufacture the finished product in the factory and directly apply it in the project, and the following steps are adopted:

[0015] Step 1: Connect the stainless steel anchor core to the cable carbon plate. The height of the stainless steel anchor core end is H 锚芯 The thickness of the cable carbon plate H 碳板 Consistent, then use 1 / 2H 碳板 Thickness of thermoplastic carbon fiber prepreg wrapped to cover the bonding area;

[0016] Step 2: Place carbon plates on the upper and lower sides of the bonding area, and then lay triaxial carbon plates used as buffer layers;

[0017] Step 3: Use 1 / 2H 碳板 Thickness of thermoplastic carbon fiber prepreg wrapped to cover the bonding area;

[0018] Step 4: Repeat steps 2 to 3 to reach the preset structure;

[0019] Step 5: Align the pressure plate to the preset position and tighten it as a whole;

[0020] Step 6: Use tension equipment and an insulation box to continuously apply a tension of ≥ 80% of the theoretical maximum load to the anchor head area, and perform vacuum curing.

[0021] Preferably, the semi-finished products are manufactured in the factory and quickly assembled on site, including the following steps:

[0022] Step 1: According to the above operation steps 1 to 6, the cable body carbon plate is replaced with a substitute steel plate. No release agent shall be applied to the interface. Use a release cloth to demould. The thickness of the substitute steel plate + the thickness of the release cloth = the thickness of the cable body carbon plate;

[0023] Step 2: Remove the release cloth and replace the steel plate, and perform plasma spraying on the bonding area interface;

[0024] Step 3: Cut the carbon plate of the cable body on site according to the length of each layer of carbon plate of the plug-in anchor head;

[0025] Step 4: Start bonding from the center carbon plate and proceed to the outer layers;

[0026] Step 5: Align the pressure plate to the preset position and tighten it as a whole;

[0027] Step 6: Use an incubator to perform vacuum curing.

[0028] In summary, the present invention has the following beneficial effects:

[0029] 1. The parallel plate cable body formed by pultrusion process has the advantages of high strength, good stability, low cost, and the production of cables is not limited by production equipment and site;

[0030] 2. Thermoplastic carbon fiber prepreg is formed under stress, and the force direction of the fiber is more in line with the actual application of the cable;

[0031] 3. The use of compression-molded triaxial carbon plates as buffer layer carbon plates can effectively decompose tensile stress and improve the shear force between the cable body carbon plates;

[0032] 4. The fast-assembly anchor head can be assembled on site, solving transportation problems and reducing process difficulty;

[0033] 5. When the parallel plate cable body is damaged, the parallel plate cable body can be replaced separately, which greatly reduces the use cost;

[0034] 6. The multi-layer cable body carbon plate has a reasonable force mechanism. Under the action of complex forces such as vibration and wind load, the force can be offset by torsional deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic structural diagram of Example 1;

[0036] Figure 2 It is a schematic diagram of Example 2.

[0037] In the figure, 1, anchor head; 11, stainless steel anchor core; 12, thermoplastic carbon fiber prepreg; 13, triaxial carbon plate; 14, central carbon plate; 2, parallel plate cable body; 21, cable body carbon plate; 22, bonding area; 23, pressure plate. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0039] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0040] Embodiment 1: A plug-in parallel plate cable structure with replaceable cable body.

[0041] like Figure 1 As shown, it includes an anchor head 1 and a parallel plate cable body 2, the anchor head 1 includes a stainless steel anchor core 11, the parallel plate cable body 2 includes a plurality of cable body carbon plates 21 arranged in parallel, the end of the anchor head 1 is butted with the end of one of the cable body carbon plates 21, and the thickness of the end of the stainless steel anchor core 11 is the same as the thickness of the cable body carbon plate 21. The number of the cable body carbon plates 21 is an odd number, the cable body carbon plate 21 butted with the stainless steel anchor core 11 is the central carbon plate 14, and the number of the cable body carbon plates 21 distributed at the upper and lower ends is an even number and is symmetrically distributed. The cable body carbon plates 21 use the same specification of carbon plates, and the parameters such as straightness, resin content, and size are consistent. Thermoplastic carbon fiber prepreg 12 and triaxial carbon plate 13 are alternately arranged outside the stainless steel anchor core 11. The overlapping area of ​​the thermoplastic carbon fiber prepreg 12 and the cable body carbon plate 21 is the bonding area 22. The ends of the thermoplastic carbon fiber prepreg 12 extend to the bonding area 22 and are located between adjacent cable body carbon plates 21. The thickness of the thermoplastic carbon fiber prepreg 12 is half of the cable body carbon plate 21. The ends of the triaxial carbon plate 13 are respectively butted with the ends of the cable body carbon plate 21. The triaxial carbon plate 13 is pre-molded with a triaxial carbon cloth in the ±45° and 0° directions. The resin content, 0° single filament direction, and thickness are consistent with the cable body carbon plate 21. The ends of the thermoplastic carbon fiber prepreg 12 are located in the area between the middle and right parts of the bonding area 22. The ends of the thermoplastic carbon fiber prepreg 12 are distributed in a V shape on both sides of the central carbon plate 14. The bonding area 22 is provided with a pressing plate 23 for fastening above and below.

[0042] Embodiment 2: A method for manufacturing a plug-in parallel plate cable structure with replaceable cable body.

[0043] like Figure 2 As shown, when the finished product is made in the factory and directly applied in the project, the following steps are adopted:

[0044] Step 1: Connect the stainless steel anchor core 11 to the cable carbon plate 21. The end height of the stainless steel anchor core 11 is H 锚芯 The thickness H of the cable carbon plate 21 碳板 Consistently, a thermoplastic carbon fiber prepreg 12 with a thickness of 1 / 2H carbon plate is then used to wrap and cover the bonding area 22;

[0045] Step 2: Place carbon plates on and below the bonding area 22 according to predetermined positions, and then lay the triaxial carbon plate 13 used as a buffer layer at the predetermined position;

[0046] Step 3: Use 1 / 2H 碳板 Thermoplastic carbon fiber prepreg 12 with a thickness of 1000 mm / s is wound around and covers the bonding area 22;

[0047] Step 4: Repeat steps 2 to 3 to reach the preset structure;

[0048] Step 5: Align the pressing plate 23 to the preset position and use tools to tighten the whole;

[0049] Step 6: Use the tension equipment and the heat preservation box to continuously apply a tension of ≥ 80% of the theoretical maximum load to the anchor head 1 area, and perform vacuum curing according to the thermoplastic prepreg conditions.

[0050] When semi-finished products are made in the factory and quickly assembled on site, the following steps are included:

[0051] Step 1: According to the above steps 1 to 6, replace the cable body carbon plate 21 with a replacement steel plate. Do not apply a release agent to the interface. Use a release cloth to demould. The thickness of the replacement steel plate + the thickness of the release cloth = the thickness of the cable body carbon plate 21;

[0052] Step 2: Remove the release cloth and the replacement steel plate, and perform plasma spraying on the interface of the bonding area 22;

[0053] Step 3: cutting the on-site cable body carbon plate 21 according to the length of each layer of the triaxial carbon plate 13 of the plug-in anchor head 1;

[0054] Step 4: Start bonding from the center carbon plate 14 and proceed to the outer layers in sequence;

[0055] Step 5: Align the pressing plate 23 to the preset position and use tools to tighten the whole;

[0056] Step 6: Use an insulated box to perform vacuum curing according to the condition of the thermoplastic prepreg.

[0057] It is necessary to add that:

[0058] The cable body carbon plate 21 needs to use the same specification of carbon plate, and the parameters such as straightness, resin content, and size should be consistent;

[0059] The triaxial carbon plate 13 is pre-molded with a triaxial carbon cloth in the ±45° and 0° directions, and has the same resin content, 0° monofilament direction, and thickness as the cable body carbon plate 21, and is used to improve the interlayer stress condition and convert the compressive stress in different directions of the cable body into shear force in the form of horizontal tension;

[0060] The height of the stainless steel anchor core 11 is twice the height of the parallel plate cable body 2, and the length of the stainless steel anchor core 11 is greater than or equal to twice its height, with a coefficient of 3-5 times being optimal;

[0061] The number of the cable body carbon plates 21 is an odd number, the carbon plate butted against the stainless steel anchor core 11 is the central carbon plate 14, and the number of the carbon plates distributed at the upper and lower ends is an even number and symmetrically distributed, which is conducive to constructing a balanced force structure;

[0062] The overlapping area between the thermoplastic carbon fiber prepreg 12 and the cable body carbon plate 21 is the bonding area 22. The bonding force of this area is the direct basis for designing the breaking force of the cable. The anchoring form of this patent has been verified, and it is recommended to design the breaking force of the cable ≥ 2* the bonding force of the bonding area 22. The bonding strength per unit area can be calculated according to 22Mpa.

[0063] The laying rule of the thermoplastic carbon fiber prepreg 12 in the bonding area 22 is as follows: the end length is from the carbon plate joint to the center point of the bonding area 22, and from the central carbon plate 14 to the outer layer, forming a V-shaped distribution (first decreasing in sequence, then increasing in sequence), and the two end positions of the same layer of thermoplastic carbon fiber prepreg 12 are kept consistent, and the overall distribution forms a reciprocating cycle arrangement;

[0064] If the tonnage of the cable is large and the number of layers is large, the main focus should be on increasing the number of cycles to avoid excessive concentration of internal shear force, which would cause damage to the fibers in the bonding area 22.

Claims

1. A plug-in parallel plate cable structure with replaceable cable body, comprising an anchor head (1) and a parallel plate cable body (2), wherein the anchor head (1) comprises a stainless steel anchor core (11), and the parallel plate cable body (2) comprises a plurality of cable body carbon plates (21) arranged in parallel, characterized in that: The end of the anchor head (1) is butted against the end of one of the cable body carbon plates (21); thermoplastic carbon fiber prepregs (12) and triaxial carbon plates (13) are alternately arranged outside the stainless steel anchor core (11); the overlapping area between the thermoplastic carbon fiber prepregs (12) and the cable body carbon plates (21) is a bonding area (22); the ends of the thermoplastic carbon fiber prepregs (12) respectively extend to the bonding area (22) and are located between adjacent cable body carbon plates (21); and the ends of the triaxial carbon plates (13) respectively butt against the ends of the cable body carbon plates (21).

2. The plug-in parallel plate cable structure with replaceable cable body according to claim 1, characterized in that: The end of the stainless steel anchor core (11) has the same thickness as the cable body carbon plate (21).

3. The plug-in parallel plate cable structure with replaceable cable body according to claim 1, characterized in that: The thickness of the thermoplastic carbon fiber prepreg (12) is half of the cable body carbon plate (21).

4. The plug-in parallel plate cable structure with replaceable cable body according to claim 1, characterized in that: Pressing plates (23) for fastening are arranged above and below the bonding area (22).

5. The plug-in parallel plate cable structure with replaceable cable body according to claim 1, characterized in that: The cable body carbon plate (21) uses carbon plates of the same specification, and the parameters such as straightness, resin content, and size are consistent.

6. The plug-in parallel plate cable structure with replaceable cable body according to claim 1, characterized in that: The triaxial carbon plate (13) is pre-made of triaxial carbon cloth in the ±45° and 0° directions by a molding process, and the resin content, 0° single filament direction, and thickness are consistent with those of the cable body carbon plate (21).

7. The plug-in parallel plate cable structure with replaceable cable body according to claim 1, characterized in that: The number of the cable body carbon plates (21) is an odd number, the cable body carbon plate (21) butted against the stainless steel anchor core (11) is the central carbon plate (14), and the number of the cable body carbon plates (21) distributed at the upper and lower ends is an even number and is symmetrically distributed.

8. The plug-in parallel plate cable structure with replaceable cable body according to claim 1, characterized in that: The ends of the thermoplastic carbon fiber prepreg (12) are located in the area between the middle and right parts of the bonding area (22), and the ends of the thermoplastic carbon fiber prepreg (12) are distributed in a V shape on both sides of the central carbon plate (14).

9. The method for manufacturing a plug-in parallel plate cable structure with replaceable cable body according to any one of claims 1 to 8, characterized in that: When the finished product is made in the factory and directly applied in the project, the following steps are adopted: Step 1: docking the stainless steel anchor core (11) with the cable body carbon plate (21), the height H of the stainless steel anchor core (11) end is consistent with the thickness H of the cable body carbon plate (21), and then using a thermoplastic carbon fiber prepreg (12) with a thickness of 1 / 2H of the carbon plate to wrap and cover the bonding area (22); Step 2: Placing carbon plates on the upper and lower sides of the bonding area (22), and then laying a triaxial carbon plate (13) used as a buffer layer; Step 3: using a thermoplastic carbon fiber prepreg (12) with a thickness of 1 / 2H carbon plate to wrap and cover the bonding area (22); Step 4: Repeat steps 2 to 3 to reach the preset structure; Step 5: Align the pressing plate (23) to the preset position and tighten the whole assembly; Step 6: Use a tension device and an insulated box to continuously apply a tension of ≥ 80% of the theoretical maximum load to the anchor head (1) area, and perform vacuum curing.

10. The manufacturing method of the plug-in parallel plate cable structure with replaceable cable body according to claim 9, characterized in that: When semi-finished products are made in the factory and quickly assembled on site, the following steps are included: Step 1: According to the above-mentioned operation steps 1 to 6, the cable body carbon plate (21) is replaced with a substitute steel plate. No release agent shall be applied to the interface. The demoulding is performed using a demoulding cloth. The thickness of the substitute steel plate + the thickness of the demoulding cloth = the thickness of the cable body carbon plate (21); Step 2: Remove the demoulding cloth and the replacement steel plate, and perform plasma spraying on the interface of the bonding area (22); Step 3: cutting the on-site cable body carbon plate (21) according to the length of each layer of carbon plate of the plug-in anchor head (1); Step 4: Start bonding from the center carbon plate (14) and proceed to the outer layers; Step 5: Align the pressing plate (23) to the preset position and tighten the whole assembly; Step 6: Use an incubator to perform vacuum curing.

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