Carbon fiber composite inhaul cable and preparation method thereof

Abstract

The invention discloses a carbon fiber composite inhaul cable and a preparation method thereof.The inhaul cable comprises multiple layers of cable body carbon plates, nuts, split type anchorage devices, sealing covers and interlayer reinforcing carbon plates, the multiple layers of cable body carbon plates are sequentially arranged in a stacked mode, and the interlayer reinforcing carbon plates are bonded between the two ends of the adjacent layers of cable body carbon plates; the exterior of the bonding part of the cable body carbon plate and the interlayer reinforcing carbon plate is wound with a high-strength carbon fiber precursor and then is poured with epoxy resin to form a pouring body, the pouring body is located in the split type anchorage device, the nut is in threaded connection with the exterior of the split type anchorage device, and the sealing cover is connected to the outer end of the split type anchorage device. The interlayer reinforcing carbon plate is formed through a pouring process, internal pressure stress can be efficiently transmitted, the overall stress condition of a pouring body is improved, after the cambered surface of the inner wall face of the split type anchorage device is matched with the cambered surface of the end face of the pouring body, automatic correction can be achieved as much as possible when relative movement occurs, and the construction efficiency is improved. Loads in different directions can be automatically corrected into tension in the horizontal direction, and certain anti-vibration and anti-fatigue characteristics are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering material CFRP application, and particularly relates to a carbon fiber composite cable and a preparation method thereof. Background Art

[0002] In recent years, carbon fiber anchor cables have been gradually applied in cable-stayed bridges, suspension bridges, and arch bridges. Currently, common carbon fiber anchor cables include parallel rod cables, parallel plate cables, stranded cables, and pull rod cables. The cable body and anchor are two important components of these composite cables.

[0003] Composite cables can be roughly divided into two categories, namely plate cables and rod cables. The cable manufacturing process of plate cables is mostly to make the cable body by curing thermoplastic prepreg; the cable manufacturing process of rod cables is to pultrude carbon fiber and resin together to form rods, and the rods are made into cable bodies by twisting and extruding. The cable body is then coordinated with the auxiliary anchor, and the anchor is formed into a cable by means of surface friction or adhesion. However, the composite anchor cable itself is limited by the existing technology, and it is impossible to achieve long span and large tonnage production and transportation. The matching anchor is also large in size. In the actual engineering application link, it causes difficulties in tensioning, installation, maintenance and other operations, and does not reflect the advantages of carbon fiber cables. For example, patent CN113585629A discloses a carbon fiber cable and cable system, patent CN111021631A discloses a circular cross-section multilayer sheet type CFRP cable system, patent CN112064504B discloses a self-anchored carbon fiber cable and processing method, patent CN114474592A discloses an integrated carbon fiber cable surface treatment combination mold and processing method, patent CN218027192U discloses a ground-anchored carbon fiber cable, patent CN113802455B discloses an anchor for carbon fiber parallel cables and its anchoring method, patent CN114293466A discloses a carbon fiber cable with a wedge-tightening structure, patent CN103496169A discloses a method for making a carbon fiber composite cable, and patent CN114277930A discloses a carbon fiber reinforced cable spatial intersection node. Through the analysis of the above existing technology patents, it can be found that for plate cables, there are defects such as poor fiber synergy caused by the multi-layer solidification process, insufficient breaking force of the cable body itself, and inability to achieve long-distance production and transportation. Rod cables and plate cables also have some common disadvantages, including: low anchoring efficiency, difficulty in making large-tonnage cables; difficulties in tensioning, installation, maintenance and other operations; concentrated compressive stress and shear stress, and greater application risks. Summary of the invention

[0004] In order to solve the problems and defects existing in the above-mentioned background technology, the present invention provides a carbon fiber composite cable and a preparation method thereof.

[0005] The present invention is achieved through the following technical solutions:

[0006] A carbon fiber composite cable, comprising a multi-layer cable body carbon plate, a nut, a split anchor, a cover, and an interlayer reinforcing carbon plate.

[0007] The multiple layers of cable body carbon plates are stacked in sequence, and interlayer reinforcing carbon plates are bonded between the two ends of adjacent layers of cable body carbon plates. High-strength carbon fiber precursor is wrapped around the outside of the bonding part of the cable body carbon plate and the interlayer reinforcing carbon plate, and then epoxy resin is poured into it to form a cast body. The cast body is located in the split anchor, the nut is threadedly connected to the outside of the split anchor, and the cover is connected to the outer end of the split anchor.

[0008] Furthermore, the two ends of the injection body are curved surfaces and the middle is cylindrical.

[0009] Furthermore, a circular hole is formed on the outer end face of the split anchor, and a rectangular hole is formed on the inner end face. The inner wall surface of the inner end of the split anchor is an arc surface, and the arc surface of the inner wall surface of the split anchor matches the arc surface of the end face of the injection body.

[0010] Furthermore, the interlayer reinforcing carbon plate comprises an interlayer reinforcing carbon plate body, a plurality of saw teeth are arranged on both sides of the interlayer reinforcing carbon plate body, and the width between the saw teeth on both sides of the interlayer reinforcing carbon plate body is the same as the width of the cable body carbon plate.

[0011] Furthermore, the plurality of saw teeth arranged on both sides of the interlayer reinforcing carbon plate body are evenly distributed.

[0012] Furthermore, the interlayer reinforcing carbon plate body area is punched at three points, and the positions of the holes are distributed in the 1 / 2-2 / 3 area from the end of the injection body to the middle direction. The three holes are distributed in a triangular shape and high-strength carbon rods are embedded.

[0013] Furthermore, the diameter of the high-strength carbon rod is not less than 5 mm.

[0014] Furthermore, the thickness of the interlayer reinforcing carbon plate is not less than the thickness of the cable body carbon plate.

[0015] According to the above-mentioned method for preparing the carbon fiber composite cable, the following steps are included:

[0016] Step 1: Production of interlayer reinforcement carbon plate: Use multi-axial woven carbon cloth, resin, and vacuum infusion process;

[0017] Step 2: Processing of interlayer reinforcing carbon plate: Carve the shape to make it serrated on both sides. The width between the serrations on both sides is the same as the width of the cable body carbon plate, and the serrations on both sides are evenly divided;

[0018] Step 3: Combine the cable body carbon plate and the interlayer reinforcing carbon plate: Use an interface adhesive with a strength of not less than 22Mpa to alternately glue the cable body carbon plate and the interlayer reinforcing carbon plate;

[0019] Step 4: Punch three holes in the tensile area of ​​the interlayer reinforcing carbon plate end, with the positions distributed in the 1 / 2-2 / 3 area from the end of the infusion body to the middle, in a triangular distribution, and embed high-strength carbon rods not less than 5mm;

[0020] Step 5: Wind the high-strength carbon fiber precursor along the serrated groove, with the winding area covering the entire tensile area, and wind it into a cylindrical shape with the same diameter as the interlayer reinforcing carbon plate, and pour epoxy resin into the end to form a poured body;

[0021] Step six: install the split anchor outside the cast body, thread the nut to the outside of the split anchor, and connect the cover to the outer end of the split anchor.

[0022] Compared with the prior art, the present invention has the following significant advantages:

[0023] (1) The cast-in-place body and the split anchor head are connected by a split arc nut, which can automatically adjust the load from different directions and convert it into horizontal shear force to avoid excessive twisting of the cable body and damage to the cable body;

[0024] (2) The cable body carbon plate adopts a multi-layer combination method. The use of small-sized carbon plates increases the number of layers in disguise, which means that the friction and horizontal shear force are greatly increased, which can reduce the size of the anchoring area. At the same time, the small-sized carbon plates have excellent bending properties and can be transported in discs;

[0025] (3) The interlayer reinforcing carbon plate is formed by the infusion process, which can efficiently transfer the internal compressive stress and improve the overall stress condition of the infusion body. After the arc surface of the inner wall of the split anchor matches the arc surface of the end face of the infusion body, it can achieve automatic correction to the greatest extent possible when relative movement occurs, and can automatically correct loads in different directions into horizontal tension, and has certain anti-vibration and anti-fatigue properties;

[0026] (4) The cast body can effectively transfer stress after being compressed, which can avoid stress concentration. The small-sized carbon plate has both strength and toughness. The multi-layer combination method has high anchoring efficiency and good reliability, and can withstand the tension and pressure of large-tonnage cables.

[0027] (5) The split anchor head can be transported first and then assembled at the construction site, which is convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the carbon fiber composite cable.

[0029] Figure 2It is a schematic diagram of the ball head zipper structure.

[0030] Figure 3 It is a schematic diagram of the structure of the ball head zipper.

[0031] Figure 4 This is the front view of the ball zipper.

[0032] Figure 5 It is a schematic diagram of the external structure of the interlayer reinforced carbon plate.

[0033] Figure 6 It is a schematic diagram of the structure of the split anchor from the first perspective.

[0034] Figure 7 It is a schematic diagram of the structure of the split anchor from the second perspective.

[0035] Figure 8 It is a schematic diagram of the internal structure of the split anchor.

[0036] Fig. 9 It is a schematic diagram of the nut structure.

[0037] Fig.10 It is a schematic diagram of the cover structure. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0039] like Figure 1-4 As shown, a carbon fiber composite cable includes a multi-layer cable body carbon plate 1 (five layers in the figure, and other layers can also be set as needed), a nut 2 (such as Fig. 9 As shown), split anchor 3, cover 4 (as shown Fig.10 As shown), interlayer reinforcing carbon plate 5,

[0040] Combination Figure 2-3 The multi-layer cable body carbon plates 1 are stacked in sequence, and interlayer reinforcing carbon plates 5 are bonded between the two ends of adjacent layers of cable body carbon plates 1. The bonding part of the cable body carbon plate 1 and the interlayer reinforcing carbon plate 5 is wrapped with high-strength carbon fiber precursor and then infused with epoxy resin to form an infusion body 6, that is, the whole ball head zipper (such as Figure 2 As shown), the injection body 6 is located in the split anchor 3, the nut 2 is threadedly connected to the outside of the split anchor 3, and the cover 4 is connected to the outer end of the split anchor 3.

[0041] Preferably, combined Figure 3 The two ends of the injection body 6 are curved surfaces and the middle is cylindrical.

[0042] Preferably, combined Figure 6-8A circular hole 3-2 is formed on the outer end face of the split anchor 3, and a rectangular hole 3-1 is formed on the inner end face. The inner wall surface of the inner end of the split anchor 3 is an arc surface 3-3. The arc surface 3-3 of the inner wall surface of the split anchor 3 matches the arc surface of the end face of the injection body 6. Such an arc surface matching design can make the ball head zipper bear force evenly as a whole. Under the action of load, loads in different directions can be automatically corrected to horizontal tension, and it has certain anti-vibration and anti-fatigue properties. After the arc surface 3-3 of the inner wall surface matches the arc surface of the end face of the injection body 6, automatic correction can be achieved to the greatest extent possible when relative movement occurs.

[0043] Preferably, combined Figure 5 The interlayer reinforcing carbon plate 5 comprises an interlayer reinforcing carbon plate body 5-1, and a plurality of saw teeth 5-2 are arranged on both sides of the interlayer reinforcing carbon plate body 5-1. The width of the interlayer reinforcing carbon plate body 5-1 is the same as the width of the cable body carbon plate 1, and the sum of the widths of the saw teeth 5-2 on both sides of the interlayer reinforcing carbon plate body 5-1 is the same as the width of the cable body carbon plate 1 (that is, the interlayer reinforcing carbon plate body 5-1 and the cable body carbon plate 1 completely overlap, that is, the width is consistent; the sum of the overall widths of the tooth pitches 5-2 extending on both sides should be consistent with the width of the carbon plate body 5-1 and the cable body carbon plate 1). Figure 5 The overlap area is Figure 3 The part marked "5" in the figure points to the protruding part overlapping with the layer cable carbon plate 1 (the early overlap of the carbon plate body and the interlayer reinforcement plate can better form a force-bearing whole, resist torsion, and avoid torsional and fatigue damage of the injection body end and the carbon plate body).

[0044] Preferably, the plurality of serrations 5 - 2 arranged on both sides of the interlayer reinforcing carbon plate body 5 - 1 are evenly distributed.

[0045] Preferably, combined Figure 5 The interlayer reinforcing carbon plate body 5-1 area is punched at three points, and the positions of the holes 5-3 are distributed in the 1 / 3-2 / 3 area from one end of the infusion body 6 to the middle direction (the punching positions are distributed in front and behind the center hole of the infusion body), and the three holes 5-3 are distributed in a triangular shape (two of the three holes are located on one side of the center hole of the infusion body and the line connecting the centers of the holes is perpendicular to the long axis of the infusion body, and the other hole is located on the other side of the center hole of the infusion body), and high-strength carbon rods are embedded (through simulation analysis, the punching position close to the tail will not have the effect of overall force, and the punching position close to the stressed end will cause premature damage after the end is stressed).

[0046] Preferably, the diameter of the high-strength carbon rod is not less than 5 mm.

[0047] Preferably, the thickness of the interlayer reinforcing carbon plate 5 is not less than the thickness of the cable body carbon plate 1 .

[0048] The method for preparing the carbon fiber composite cable of the present invention comprises the following steps:

[0049] Step 1: Preparation of interlayer reinforcing carbon plate 5: Multi-axial woven carbon cloth is used with resin and vacuum infusion process to improve the interlayer stress condition and convert the compressive stress of the cable body in different directions into shear force in the form of horizontal tension;

[0050] Step 2: Processing of the interlayer reinforcing carbon plate 5: Carving the shape to form a serrated shape on both sides, the width between the serrations 5-2 on both sides is the same as the width of the cable body carbon plate 1, and the serrations 5-2 on both sides are evenly divided;

[0051] Step 3: Combining the cable body carbon plate 1 with the interlayer reinforcing carbon plate 5: Using an interface adhesive with a strength of not less than 22 MPa, alternately glue the cable body carbon plate 1 and the interlayer reinforcing carbon plate 5;

[0052] Step 4: Punch three holes in the tensile area of ​​the interlayer reinforcing carbon plate 5 at the end, with the holes distributed in a triangular shape in the 1 / 2-2 / 3 area from the end of the infusion body to the middle, and embed high-strength carbon rods not less than 5 mm;

[0053] Step 5: staggered winding: starting from one end, wind the high-strength carbon fiber precursor along the groove of the sawtooth 5-2, and after winding the adjacent sawtooth once, extend and wind to the other end in turn, and regard the other end as the end point, go back and forth, and wind evenly (this process step can give the infusion body more fibers, improve the hardness and toughness of the infusion body), the winding area covers the entire tensile area, and is wound into a cylinder with the same diameter as the interlayer reinforcing carbon plate 5. The end is infused with epoxy resin to form the infusion body 6, that is, the whole forms a ball head zipper (such as Figure 2 shown);

[0054] Step six: install the split anchor 3 (the anchor is a structure of upper and lower halves) outside the grouting body 6, thread the nut 2 to the outside of the split anchor 3 to fasten the split anchor 3, and connect the cover 4 to the outer end of the split anchor 3.

[0055] The coordinated force mechanism of the cable of the present invention is reasonable and the anchoring efficiency is high, which makes it possible to use large-tonnage cables. The carbon plate formed by the pultrusion process increases the overall coordination of the cable, reduces the probability of cable body damage, avoids compressive stress concentration, shear stress concentration, and large cable-anchor slippage, reduces the probability of shear damage and debonding failure, is easy to install, and can be transported in rolls.

[0056] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A carbon fiber composite cable, characterized in that: It comprises a multi-layer cable body carbon plate (1), a nut (2), a split anchor (3), a cover (4), and an interlayer reinforcing carbon plate (5). The multiple layers of cable body carbon plates (1) are stacked in sequence, and interlayer reinforcing carbon plates (5) are bonded between the two ends of adjacent layers of cable body carbon plates (1). The bonding portion between the cable body carbon plates (1) and the interlayer reinforcing carbon plates (5) is externally wrapped with high-strength carbon fiber precursor and then infused with epoxy resin to form an infusion body (6). The infusion body (6) is located in the split anchor (3), the nut (2) is threadedly connected to the outside of the split anchor (3), and the cover (4) is connected to the outer end of the split anchor (3).

2. The carbon fiber composite cable according to claim 1, characterized in that: The two ends of the injection body (6) are arcuate surfaces, and the middle is cylindrical.

3. The carbon fiber composite cable according to claim 2, characterized in that: The outer end surface of the split anchor (3) is provided with a circular hole (3-2), and the inner end surface is provided with a rectangular hole (3-1); the inner wall surface of the inner end of the split anchor (3) is a curved surface (3-3), and the curved surface (3-3) of the inner wall surface of the split anchor (3) matches the curved surface of the end surface of the injection body (6).

4. The carbon fiber composite cable according to claim 3, characterized in that: The interlayer reinforcing carbon plate (5) comprises an interlayer reinforcing carbon plate body (5-1), a plurality of saw teeth (5-2) are arranged on both sides of the interlayer reinforcing carbon plate body (5-1), and the width between the saw teeth (5-2) on both sides of the interlayer reinforcing carbon plate body (5-1) is the same as the width of the cable body carbon plate (1).

5. The carbon fiber composite cable according to claim 4, characterized in that: The plurality of saw teeth (5-2) arranged on both sides of the interlayer reinforcing carbon plate body (5-1) are evenly distributed.

6. The carbon fiber composite cable according to claim 4, characterized in that: The interlayer reinforcing carbon plate body (5-1) is punched in three-point manner, and the positions of the holes (5-3) are distributed in the 1 / 3-2 / 3 area from the end of the injection body (6) to the middle direction. The three holes (5-3) are distributed in a triangular shape and embedded with high-strength carbon rods.

7. The carbon fiber composite cable according to claim 4, characterized in that: The diameter of the high-strength carbon rod is not less than 5 mm.

8. The carbon fiber composite cable according to any one of claims 4 to 7, characterized in that: The thickness of the interlayer reinforcing carbon plate (5) is not less than the thickness of the cable body carbon plate (1).

9. The method for preparing a carbon fiber composite cable according to any one of claims 4 to 8, characterized in that: The following steps are involved: Step 1: Preparation of interlayer reinforcing carbon plate (5): using multi-axial woven carbon cloth, combined with resin, and made by vacuum infusion process; Step 2: Processing of the interlayer reinforcing carbon plate (5): carving the shape so that the two sides form a serrated shape, the width between the serrations (5-2) on the two sides is the same as the width of the cable body carbon plate (1), and the serrations (5-2) on the two sides are evenly divided; Step 3: Combining the cable body carbon plate (1) and the interlayer reinforcing carbon plate (5): using an interface adhesive to bond, with a bonding strength of not less than 22 MPa, alternately bonding the cable body carbon plate (1) and the interlayer reinforcing carbon plate (5); Step 4: Punch three holes in the tension area of ​​the interlayer reinforcing carbon plate (5) at the end, with the holes distributed in a triangular shape in the 1 / 2-2 / 3 area from the end of the cast body to the middle, and embed high-strength carbon rods not less than 5 mm; Step 5: staggered winding: starting from one end, high-strength carbon fiber precursor is wound along the groove of the sawtooth (5-2), and after winding around the adjacent sawtooth for one circle, the winding is extended to the other end in turn, and the other end is regarded as the end point, and the winding is repeated back and forth, and the winding area covers the entire tension area, and is wound into a cylindrical shape with the same diameter as the interlayer reinforcement carbon plate (5). The end is poured with epoxy resin to form a poured body (6), that is, a ball head zipper is formed as a whole; Step six: Install the split anchor (3) outside the grouting body (6), thread the nut (2) to the outside of the split anchor (3), and connect the cover (4) to the outer end of the split anchor (3).

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