Intelligent epoxy strand cable construction method

Abstract

The present application belongs to the technical field of intelligent composite epoxy steel strand construction, and particularly relates to a construction method of intelligent epoxy steel strand or cable, wherein a special cutting machine is used to cut off the annular protective steel wire wrapped outside at the reserved position at the two ends of the intelligent epoxy steel strand or cable, the cutting depth is the total radius of the intelligent epoxy steel strand or cable minus the fiber radius of the carbon fiber protective rib, and the central carbon fiber wire and the internal optical fiber cannot be damaged; the cut end is heated by a hot air gun, the area is uniformly heated during heating, the epoxy coating is torn open by a sharp cone along the gap between the edge wires when the epoxy layer is softened at high temperature, and the outer multiple protective steel wires are peeled off; the carbon fiber wire wrapped outside the optical fiber is removed by a craft knife; the outer layer protection of the optical fiber is peeled off by an optical fiber stripping pliers, and then jumper welding is performed, which makes up the blank of the existing technology for the body method of the intelligent epoxy steel strand or cable.

Description

Technical Field

[0001] This invention belongs to the field of intelligent composite epoxy steel strand construction technology, specifically relating to an intelligent epoxy steel strand or cable construction method. Background Technology

[0002] Steel strands are a crucial component of prestressed structures such as bridges, anchorages, and geotechnical supports. The health of the steel strands is a key indicator of the prestressed structure's performance. While filled epoxy steel strands have addressed the century-long rust and corrosion prevention issues of ordinary steel strands, the question of whether the actual tension of the steel strands remains consistently adequate and whether the stress state can be monitored in real time has long troubled bridge experts. Currently, there are no commercially available, mass-producible steel strand products that offer both corrosion protection and the ability to monitor the stress-strain state of bridges. Therefore, developing a steel strand that provides long-term corrosion and rust prevention while also enabling real-time stress state monitoring is of great significance. This would extend the service life of the steel strands and ensure the health of prestressed engineering structures can be monitored at any time. Patent No. 2020222621448 discloses an intelligent composite epoxy steel strand. This intelligent composite epoxy steel strand consists of an optical fiber wrapped with carbon fiber protective ribs placed between several encircling protective steel wires, and then filled with an oxygen coating in the protective steel wires and gaps.

[0003] Optical fiber is brittle. Although it has tensile strength, its biggest drawback is its very weak resistance to bending and shearing forces. Therefore, existing conventional steel strand construction methods are completely unsuitable for the construction of intelligent composite epoxy steel strand cables. Furthermore, after the intelligent epoxy steel strand cable or wire rope is installed, the optical fiber needs to be stripped before it can be connected to the corresponding equipment. Therefore, how to strip the outer protective steel wire, oxygen coating, and carbon fiber protective reinforcement without damaging the optical fiber is a technical challenge that needs to be solved. Damaging the optical fiber during stripping could render the entire intelligent epoxy steel strand cable or wire rope unusable. Additionally, the stripped optical fiber needs to be properly protected to prevent damage. Summary of the Invention

[0004] The purpose of this invention is to provide a construction method for intelligent epoxy steel stranded wires or cables, which overcomes the shortcomings of the prior art, fills the gap in the specific construction method of intelligent epoxy steel stranded wires or cables, and solves the technical problems of intelligent epoxy steel stranded wire or cable construction, stripping of the outer protective layer of optical fiber, and protection of the optical fiber after stripping.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] A construction method for intelligent epoxy steel strand or cable includes the following steps;

[0007] S1. When cutting materials, reserve a working length for optical fiber welding at both ends according to the length required for the construction of the clue or cable. The working length is 15-25 cm.

[0008] S2. Lay the intelligent epoxy steel strand or cable together with other ordinary epoxy steel strands into the cable and tension them at the same time.

[0009] S3. After tensioning, cut the ordinary epoxy stranded wire to the designed length;

[0010] S4. Use a special cutting machine to cut the outer protective steel wire in a ring shape at the reserved positions at both ends of the intelligent epoxy steel strand or cable. The cutting depth is the total radius of the intelligent epoxy steel strand or cable minus the fiber radius of the carbon fiber protective rib. Do not damage the central carbon fiber wire and the internal optical fiber.

[0011] S5. Heat the ring-cut end with a hot air gun, ensuring uniform heating of the area. While the epoxy layer softens at high temperature, use a sharp awl to tear open the epoxy coating along the gap between the edge wires, and then remove the multiple outer protective steel wires.

[0012] S6. Use a utility knife to remove the carbon fiber filaments wrapped around the optical fiber;

[0013] S7. Use fiber optic strippers to strip the outer protective layer of the fiber, and then perform patch cord soldering.

[0014] S8. Clean and remove the film from the welded area using a mixture of acetone, alcohol, and rust remover.

[0015] S9. Wrap the welded areas with epoxy coating liquid after cleaning and film removal;

[0016] S10. After splicing the jumper wires, connect the composite smart epoxy cable to be measured in series to the distributed fiber optic stress and strain demodulator.

[0017] Furthermore, in step S5, the heating temperature is 373–377 degrees Celsius, and the heating time is 540–560 seconds.

[0018] Furthermore, the mass ratio of acetone, alcohol, and rust remover in the mixed solution is 3:1:0.5.

[0019] Furthermore, the epoxy coating liquid includes an epoxy particle solution and a coagulating liquid, wherein the mass ratio of the epoxy particle solution to the coagulating liquid is 1:1.05.

[0020] Furthermore, the intelligent epoxy steel strand or cable tensioning adopts a non-destructive optical fiber tensioning mechanism.

[0021] Furthermore, the non-destructive fiber tensioning mechanism includes an outer sheath, movable clamps, and a fixed baffle. The outer sheath has a smart epoxy steel strand or cable clearance hole in the middle. The section of the outer sheath facing the fixed baffle has a flared opening. Multiple movable clamps are arranged in a ring on the flared opening. The fixed baffle has multiple wedge-shaped holes on the side facing the movable clamps. The end of the movable clamp facing the fixed baffle has a wedge block that mates with the wedge-shaped holes. The wedge block and the wedge-shaped holes mate, and the movable clamp moves under the action of the wedge block and the wedge-shaped holes. Both the wedge block and the wedge-shaped holes have inclined surfaces, and the inclined angles of the inclined surfaces of the wedge block, the inclined surfaces of the wedge-shaped holes, and the flared opening are consistent.

[0022] Furthermore, the moving stroke of the movable clip is 6-8 mm.

[0023] Furthermore, in S5, in order to ensure uniform heating of the area during heating, multiple hot air gun outlets are arranged in a ring or one hot air gun has multiple air outlets. The multiple air outlets are arranged in a ring, and the hot air gun is a constant temperature hot air gun with a temperature control chip inside.

[0024] Furthermore, the multiple hot air guns are fixed by a ring bracket, and the air outlets of the multiple hot air guns all point to the center of the ring bracket.

[0025] Furthermore, the multiple air outlets of the hot air gun include a hot air gun and an annular air outlet mechanism. The annular air outlet mechanism includes an annular pipe with several air outlets evenly distributed on the inner side of the annular pipe. The outer side of the annular pipe is connected to the hot air gun through a pipe, and all the air outlets point to the center of the annular pipe.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] 1. Provide specialized construction methods for the specific construction of intelligent epoxy steel strands or cables, making it convenient for construction personnel to carry out the construction.

[0028] 2. The ring-shaped synchronous heating can melt the epoxy coating simultaneously, effectively avoiding local overheating or underheating, and providing maximum protection for the optical fiber.

[0029] 3. Cleaning and protecting the welded areas can greatly extend their service life, preventing them from aging and being damaged due to exposure to the elements.

[0030] 4. The inclined angles of the wedge block inclined surface, the wedge hole inclined surface, and the flared mouth are consistent, which can ensure that the movable clamp will not tilt when it moves towards the fixed baffle, and can effectively prevent the movable clamp from cutting the intelligent epoxy steel strand or cable. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the internal structure of a non-destructive fiber tensioning mechanism.

[0032] Figure 2 This is a schematic diagram of three movable clip-type non-destructive optical fiber tensioning mechanisms.

[0033] Figure 3 This is a schematic diagram of a four-movable clip-type non-destructive fiber tensioning mechanism.

[0034] Figure 4 This is a schematic diagram of a method for distributing multiple hot air gun outlets in a ring.

[0035] Figure 5 This is a schematic diagram of a hot air gun with multiple air outlets.

[0036] Figure 6 Photos of smart epoxy steel strands or cables after cutting.

[0037] Figure 7 Photographs of intelligent epoxy steel strands or optical fibers after they have been stripped.

[0038] Figure 8 Photograph of a distributed fiber optic stress-strain demodulator for connecting intelligent epoxy steel strands or cables to optical fibers.

[0039] 1. Intelligent epoxy steel strand or cable; 2. Non-destructive fiber optic tensioning mechanism; 3. Hot air gun; 4. Annular air outlet mechanism; 5. Annular bracket; 21. Outer sheath; 22. Movable clamp; 23. Fixed baffle; 221. Wedge block; 231. Wedge hole. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Example 1

[0042] A construction method for intelligent epoxy steel strand or cable includes the following steps;

[0043] S1. When cutting materials, reserve a working length for optical fiber welding at both ends according to the length required for the construction of the clue or cable. The working length is 15-25 cm.

[0044] S2. Lay the intelligent epoxy steel strand or cable together with other ordinary epoxy steel strands into the cable and tension them at the same time.

[0045] S3. After tensioning, cut the ordinary epoxy stranded wire to the designed length;

[0046] S4. Use a special cutting machine to cut the outer protective steel wire in a ring shape at the reserved positions at both ends of the intelligent epoxy steel strand or cable. The cutting depth is the total radius of the intelligent epoxy steel strand or cable minus the fiber radius of the carbon fiber protective rib. Do not damage the central carbon fiber wire and the internal optical fiber.

[0047] S5. Heat the ring-cut end with a hot air gun, ensuring uniform heating of the area. While the epoxy layer softens at high temperature, use a sharp awl to tear open the epoxy coating along the gap between the edge wires, and then remove the multiple outer protective steel wires. Ring-shaped synchronous heating can melt the epoxy coating simultaneously, effectively avoiding local overheating or local underheating, and maximizing the protection of the optical fiber.

[0048] S6. Use a utility knife to remove the carbon fiber filaments wrapped around the optical fiber;

[0049] S7. Use fiber optic strippers to strip the outer protective layer of the fiber, and then perform patch cord soldering.

[0050] S8. Clean and remove the film from the welded area using a mixture of acetone, alcohol, and rust remover.

[0051] S9. Wrap the welded areas with epoxy coating liquid after cleaning and film removal; re-cleaning and protecting the welded areas can greatly improve their service life and prevent them from aging and being damaged due to exposure.

[0052] S10. After splicing the jumper wires, connect the composite smart epoxy cable to be measured in series to the distributed fiber optic stress and strain demodulator.

[0053] Furthermore, in step S5, the heating temperature is 373–377 degrees Celsius, and the heating time is 540–560 seconds.

[0054] Example 2

[0055] The mass ratio of acetone, alcohol, and rust remover in the mixed solution is 3:1:0.5.

[0056] The epoxy coating solution includes an epoxy particle solution and a coagulating liquid, with a mass ratio of epoxy particle solution to coagulating liquid of 1:1.05. This epoxy coating solution is specifically designed for steel strands and is mainly used for the protection and bonding of the steel substrate.

[0057] Example 3

[0058] As shown in the figure Figure 1 , Figure 2 and Figure 3The intelligent epoxy steel strand or cable 1 is tensioned using a non-destructive optical fiber tensioning mechanism 2. The non-destructive fiber tensioning mechanism 2 includes an outer sheath 21, movable clamps 22, and a fixed baffle 23. The outer sheath 21 has a clearance hole for the intelligent epoxy steel strand or cable in the middle. The section of the outer sheath facing the fixed baffle has a flared opening. Multiple movable clamps are arranged in a ring on the flared opening. The fixed baffle 23 has multiple wedge-shaped holes 231 on the side facing the movable clamps. The end of the movable clamp 22 facing the fixed baffle has a wedge block 221 that mates with the wedge-shaped hole. The wedge block 221 and the wedge-shaped hole 231 mate, and the movable clamp moves under the action of the wedge block and the wedge-shaped hole. The moving stroke of the movable clamp is 6-8 mm. Both the wedge block and the wedge-shaped hole have inclined surfaces. The inclined angles of the inclined surfaces of the wedge block, the inclined surfaces of the wedge-shaped hole, and the flared opening are consistent, which can ensure that the movable clamp will not tilt when moving towards the fixed baffle, and can effectively prevent the movable clamp from cutting the intelligent epoxy steel strand or cable.

[0059] Example 4

[0060] As shown in the figure Figure 4 and Figure 5 In the first embodiment, in order to ensure uniform heating of the area during heating, multiple hot air gun outlets are generally distributed in a ring or one hot air gun has multiple air outlets. The multiple air outlets are distributed in a ring, and the hot air gun 3 is a constant temperature hot air gun, which is equipped with a temperature control chip.

[0061] The method of multiple hot air gun outlets being distributed in a ring is that multiple hot air guns 3 are fixed by a ring bracket 5, and the air outlets of multiple hot air guns all point to the center of the ring bracket.

[0062] A hot air gun has multiple air outlets, including a hot air gun 3 and an annular air outlet mechanism 4. The annular air outlet mechanism 4 includes an annular pipe with several air outlets evenly distributed on the inner side of the annular pipe. The outer side of the annular pipe is connected to the hot air gun through a pipe, and all the air outlets point to the center of the annular pipe.

[0063] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A construction method for intelligent epoxy steel strand or cable, characterized in that: Includes the following steps; S1. When cutting materials, reserve a working length for optical fiber welding at both ends according to the length required for the construction of the clue or cable. The working length is 15-25 cm. S2. Lay the intelligent epoxy steel strand or cable together with other ordinary epoxy steel strands into the cable and tension them at the same time. S3. After tensioning, cut the ordinary epoxy stranded wire to the designed length; S4. Use a special cutting machine to cut the outer protective steel wire in a ring shape at the reserved positions at both ends of the intelligent epoxy steel strand or cable. The cutting depth is the total radius of the intelligent epoxy steel strand or cable minus the fiber radius of the carbon fiber protective rib. Do not damage the central carbon fiber wire and the internal optical fiber. S5. Heat the ring-cut end with a hot air gun, ensuring uniform heating of the area. While the epoxy layer softens at high temperature, use a sharp awl to tear open the epoxy coating along the gap between the edge wires, and then remove the multiple outer protective steel wires. S6. Use a utility knife to remove the carbon fiber filaments wrapped around the optical fiber; S7. Use fiber optic strippers to strip the outer protective layer of the fiber, and then perform patch cord soldering. S8. Clean and remove the film from the welded area using a mixture of acetone, alcohol, and rust remover. S9. Wrap the welded areas with epoxy coating liquid after cleaning and film removal; S10. After splicing the jumper wires, connect the composite smart epoxy cable to be measured in series to the distributed fiber optic stress and strain demodulator. The intelligent epoxy steel strand or cable tensioning adopts a non-destructive optical fiber tensioning mechanism. The non-destructive optical fiber tensioning mechanism includes an outer sheath, movable clamps, and a fixed baffle. The outer sheath has a clearance hole for the intelligent epoxy steel strand or cable in the middle. The section of the outer sheath facing the fixed baffle has a flared opening. There are multiple movable clamps arranged in a ring on the flared opening. The side of the fixed baffle facing the movable clamps has multiple wedge-shaped holes. The end of the movable clamp facing the fixed baffle has a wedge block that mates with the wedge-shaped holes. The wedge block and the wedge hole mate, and the movable clamp moves under the action of the wedge block and the wedge hole. Both the wedge block and the wedge hole have inclined surfaces, and the inclined angles of the inclined surfaces of the wedge block, the wedge hole, and the flared opening are consistent.

2. The construction method for intelligent epoxy steel strand or cable according to claim 1, characterized in that: The heating temperature in S5 is 373-377 degrees Celsius, and the heating time is 540-560 seconds.

3. The construction method for intelligent epoxy steel strand or cable according to claim 1, characterized in that: The mass ratio of acetone, alcohol, and rust remover in the mixed solution is 3:1:0.

5.

4. The construction method for intelligent epoxy steel strand or cable according to claim 1, characterized in that: The epoxy coating liquid includes an epoxy particle solution and a coagulating liquid, wherein the mass ratio of the epoxy particle solution to the coagulating liquid is 1:1.

05.

5. The construction method for intelligent epoxy steel strand or cable according to claim 1, characterized in that: The moving stroke of the movable clip is 6-8 mm.

6. The construction method for intelligent epoxy steel strand or cable according to claim 2, characterized in that: In S5, to ensure uniform heating of the area during heating, multiple hot air gun outlets are arranged in a ring or one hot air gun has multiple air outlets. The multiple air outlets are arranged in a ring, and the hot air gun is a constant temperature hot air gun with a temperature control chip inside.

7. The construction method for intelligent epoxy steel strand or cable according to claim 6, characterized in that: The multiple hot air guns are fixed by a ring bracket, and the air outlets of the multiple hot air guns all point to the center of the ring bracket.

8. The construction method for intelligent epoxy steel strand or cable according to claim 6, characterized in that: The hot air gun with multiple air outlets includes a hot air gun and an annular air outlet mechanism. The annular air outlet mechanism includes an annular pipe with several air outlets evenly distributed on the inner side of the annular pipe. The outer side of the annular pipe is connected to the hot air gun through a pipe, and all the air outlets point to the center of the annular pipe.

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