Layout structure and layout method of built-in suspension bridge sensing optical cable for suspension bridge main cable

Abstract

The invention relates to a layout structure and a layout method of a built-in suspension bridge sensing optical cable for a suspension bridge main cable, and belongs to the technical field of sensing optical cables. Comprising a suspension bridge body, main cables and a laying mechanism, the suspension bridge body comprises two cable bent towers, a middle span is arranged between the two cable bent towers, side spans are arranged on the two sides of the middle span respectively, cable saddles are arranged on the tops of the cable bent towers respectively, the main cables are evenly distributed on the middle span and the two side spans, and anchor chambers are arranged at the two ends of each main cable respectively; the laying mechanism comprises a first take-up reel, a second take-up reel, a first pay-off reel and a second pay-off reel, the first take-up reel and the first pay-off reel are arranged on the same side, and the second take-up reel and the second pay-off reel are arranged on the same side; the first take-up reel and the second pay-off reel are arranged at the two cable saddles, and the first pay-off reel and the second take-up reel are arranged in the two anchor chambers. According to the invention, the replacement friction force is reduced, the replacement efficiency is improved, and the distribution of the cable strands in the main cable is not affected.

Description

Technical Field

[0001] The invention relates to a laying structure and a laying method of a built-in suspension bridge sensing optical cable for a main cable of a suspension bridge, belonging to the technical field of sensing optical cables. Background Art

[0002] A suspension bridge refers to a bridge with cables suspended by towers and anchored on both banks or both ends of the bridge as the main load-bearing components of the superstructure; to ensure the safe use of the bridge, a central dehumidification duct is usually set at the center of the main cable to adjust the temperature and humidity inside the main cable to avoid rusting of the steel wire and causing safety accidents. Therefore, a temperature and humidity sensing optical cable needs to be laid throughout the main cable to measure and adjust the temperature and humidity in the dehumidification duct of the main cable, so as to monitor the temperature and humidity in the central dehumidification duct of the main cable in real time and improve the service life of the main cable. The design service life of the sensing optical cable is usually 30 years. In order to improve the service life of the main cable and the suspension bridge as a whole, the temperature and humidity sensing optical cable in the main cable needs to be replaced regularly. Therefore, a layout structure and layout method of a built-in temperature and humidity sensing optical cable for the main cable of a suspension bridge are proposed to replace the sensing optical cable safely and quickly. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a layout structure and a layout method of an internal suspension bridge sensing optical cable for the main cable of a suspension bridge in response to the above-mentioned prior art. When the sensing optical cable is replaced, the replacement friction is reduced, the replacement efficiency is improved, and the distribution of the internal strands of the main cable is not affected.

[0004] The technical solution adopted by the present invention to solve the above-mentioned problem is: a laying structure of a built-in suspension bridge sensing optical cable for a main cable of a suspension bridge, comprising a suspension bridge body, a main cable and a laying mechanism, the suspension bridge body comprising two symmetrically arranged cable towers, a middle span is arranged between the two cable towers, side spans are respectively arranged on both sides of the middle span, cable saddles are respectively arranged on the tops of the cable towers, the main cables are evenly laid on the middle span and the two side spans, anchor chambers are respectively arranged at both ends of the main cable, and the anchor chambers are fixedly connected to the ground; The laying mechanism includes two groups of take-up reels and two groups of pay-off reels, the take-up reels are the first take-up reel and the second take-up reel, the pay-off reels are the first pay-off reel and the second pay-off reel, the first take-up reel and the first pay-off reel are arranged on the same side, and the second take-up reel and the second pay-off reel are arranged on the same side; the first take-up reel is arranged at a saddle, and the second pay-off reel is arranged at another saddle, the first pay-off reel is arranged in an anchor chamber, and the second take-up reel is arranged in another anchor chamber, the first take-up reel and the second take-up reel are respectively wound with connecting ropes, and the first pay-off reel and the second pay-off reel are respectively wound with sensing optical cable bodies to be installed; The main cable includes multiple groups of cable strand units, the cable saddle is provided with a saddle groove, the cable strand unit is arranged in the saddle groove, and the two ends of the cable strand unit are respectively fixed in the anchor chamber through anchor rods; multiple sections of central dehumidification pipes are provided in the center of the cable strand unit, and sensing optical cable bodies are respectively inserted in the central dehumidification pipes, and both ends of the central dehumidification pipes are exposed and extended at the cable saddle, and the laying mechanism replaces the sensing optical cable body in the central dehumidification pipe.

[0005] The first wire take-up drum and the second wire pay-off drum arranged at the saddle respectively include two wire drums, and the two wire drums rotate independently.

[0006] The cable strand units respectively include a plurality of tightly fitted cable strands, and the plurality of cable strands are wrapped by an outer sheath.

[0007] The cross section of the cable strand unit is hexagonal.

[0008] A plurality of ventilation slots are provided on the central dehumidification duct, and any ventilation slot group includes two ventilation slots arranged throughout the entire length; a plurality of ball bins are provided on the inner wall of the central dehumidification duct, and the plurality of ball bins are evenly distributed in a circumferential direction; balls are respectively arranged in any of the ball bins, and the balls are in contact with the outer surface of the sensing optical cable body; a limit cover is provided at the end cover of the central dehumidification duct.

[0009] The ends of the central dehumidification pipe are respectively provided with a plurality of grooves uniformly distributed in an annular direction, the grooves correspond to the ball bins, and the outer peripheries of the limit covers are respectively provided with limit blocks matching the grooves, and the limit blocks are embedded in the grooves.

[0010] The distance between the outer wall of the sensing optical cable body and the inner wall of the central dehumidification pipe is 3-5 mm, and the diameter of the ball is 7-11 mm.

[0011] The sensing optical cable body comprises a sensing optical fiber bundle, a metal armor tube is sleeved on the sensing optical fiber bundle, and an outer layer reinforcement member is sleeved on the metal armor tube.

[0012] A method for laying out a laying structure of a built-in suspension bridge sensing optical cable for a main cable of a suspension bridge, the method comprising the following steps: Step 1: The first pay-off drum is arranged in an anchor chamber, the second take-up drum is arranged in another anchor chamber, the second pay-off drum is arranged at the saddle at the same side position as the second take-up drum, and the first take-up drum is arranged at the saddle arranged on the same side as the first pay-off drum; one end of the outer layer reinforcement member of the sensing optical cable at one side span position is connected to an outer layer reinforcement member of the sensing optical cable to be installed on the first pay-off drum, and the other end of the outer layer reinforcement member of the sensing optical cable at one side span position is connected to a connecting rope on the first take-up drum; one end of the outer layer reinforcement member of the sensing optical cable at the mid-span position is connected to another connecting rope on the first take-up drum, and the other end of the outer layer reinforcement member of the sensing optical cable at the mid-span position is connected to an outer layer reinforcement member of the sensing optical cable to be installed on the second pay-off drum; one end of the outer layer reinforcement member of the sensing optical cable at the other side span position is connected to another outer layer reinforcement member of the sensing optical cable to be installed on the second pay-off drum, and the other end of the outer layer reinforcement member of the sensing optical cable at the other side span position is connected to a connecting rope on the second take-up drum; Step 2: Rotate two sets of pay-off reels and two sets of take-up reels at a synchronous speed, the two reels of the second pay-off reel pay out the wire synchronously, the two reels of the first take-up reel take up the wire synchronously, and then coordinate the pay-off of the first pay-off reel with the take-up of the second take-up reel; Step 3: With the pulling force of the take-up reel, the sensing optical cable body in the central dehumidification pipe is pulled outward, and the ball assists the sensing optical cable body to slide out of the central dehumidification pipe, while the sensing optical fiber body to be installed released by the pay-off reel moves toward the central dehumidification pipe, and the ball assists the sensing optical cable body to move into the central dehumidification pipe, thereby synchronously replacing the sensing optical cable bodies at the mid-span and both side spans; Step 4: After the replacement is completed, separate the outer reinforcements.

[0013] The upper outer layer reinforcement member of the sensing optical cable is connected to the upper outer layer reinforcement member of the sensing optical cable to be installed by spot welding.

[0014] Compared with the prior art, the advantages of the present invention are: a layout structure and a layout method of a built-in suspension bridge sensing optical cable for a cable bridge main cable, a central dehumidification duct is arranged at the center of the main cable, and the cable strands can be dried through the central dehumidification duct to reduce rainwater rust, thereby extending the service life. Three sections of sensing optical cable bodies are arranged in the central dehumidification duct, respectively located at the middle span and the two side spans, and the cable strand units are separated in cooperation with the saddle grooves on the cable saddle, so that the central dehumidification duct exposes the cable saddle, which achieves the purpose of ventilation on the one hand, and facilitates the replacement of the sensing optical cable body by the layout mechanism on the other hand. The sensing optical cable body monitors the main cable, and when replaced, the layout mechanism and the ball bearing cooperate to greatly reduce the friction of replacement, improve the replacement efficiency, and avoid the influence on the distribution of the cable strands in the main cable during replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a schematic diagram of a layout structure of a built-in suspension bridge sensing optical cable for a main cable of a suspension bridge according to an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the structure of the middle main cable; Figure 3 This is a schematic diagram of the separation of the limit cover and the central dehumidification pipe outlet; Figure 4 is a cross-sectional view of a sensing optical cable body; Figure 5 is the cross-sectional view of the saddle; In the figure, 1 is the suspension bridge body, 2 is the main cable, 3 is the middle span, 4 is the side span, 5 is the cable tower, 6 is the cable saddle, 7 is the anchor chamber, 8 is the cable strand, 9 is the outer sheath, 10 is the saddle groove, 11 is the central dehumidification duct, 12 is the sensing optical cable body, 13 is the ventilation notch, 14 is the ball bin, 15 is the limit block, 16 is the ball, 17 is the groove, 18 is the limit cover, 19 is the sensing optical fiber bundle, 20 is the metal armor tube, 21 is the outer reinforcement, 22 is the second take-up drum, 23 is the second pay-off drum, 24 is the first pay-off drum, 25 is the first take-up drum. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below with reference to the accompanying drawings.

[0017] like Figure 1 As shown, in this embodiment, a layout structure of a built-in suspension bridge sensing optical cable for a main cable of a suspension bridge includes a suspension bridge body 1, a main cable 2 and a layout mechanism. The suspension bridge body 1 includes two symmetrically arranged cable towers 5, a middle span 3 is arranged between the two cable towers 5, and side spans 4 are respectively arranged on both sides of the middle span 3. Figure 5 As shown, saddles 6 are provided on the tops of the cable towers 5, and saddle grooves 10 are provided on the saddles 6. The main cables 2 are evenly distributed on the middle span 3 and the two side spans 4, and anchor chambers 7 are provided at both ends of the main cables 2, which are fixedly connected to the ground. Figure 2 As shown, the main cable 2 includes multiple groups of cable strand units, and the cross-section of the cable strand units is a hexagonal structure. The multiple groups of cable strand units are arranged in the saddle groove 10, and the saddle groove separates them. The two ends of the cable strand unit are fixed in the anchor chamber 7 by anchor rods. Any cable strand unit includes multiple cable strands 8, which are tightly fitted into a honeycomb hexagon, and then wrapped and shaped by an outer sheath 9. Three sections of central dehumidification pipes 11 are arranged in the center of the cable strand unit, one section of the central dehumidification pipe 11 is arranged at the mid-span position, and the other two sections of the central dehumidification pipes are arranged at the corresponding side span positions. The sensing optical cable body 12 is inserted in the central dehumidification pipe 11, and both ends of the central dehumidification pipe are exposed and extended at the cable saddle. On the one hand, the purpose of ventilation is achieved, and on the other hand, it is convenient for the laying mechanism to replace the sensing optical cable body inside the central dehumidification pipe.

[0018] The above-mentioned laying mechanism includes two groups of take-up reels and two groups of pay-off reels. The take-up reels are the first take-up reel 25 and the second take-up reel 22, and the pay-off reels are the first pay-off reel 24 and the second pay-off reel 23. The first take-up reel 25 and the first pay-off reel 24 are arranged on the same side, and the second take-up reel 22 and the second pay-off reel 23 are arranged on the same side. The first take-up reel is arranged at a saddle, and the second pay-off reel is arranged at another saddle. The first pay-off reel is arranged in an anchor chamber, and the second take-up reel is arranged in another anchor chamber. The first take-up reel and the second pay-off reel arranged at the saddle respectively include two reels, and the two reels rotate independently. The first take-up reel and the second take-up reel are respectively wound with connecting ropes, and the first pay-off reel and the second pay-off reel are respectively wound with the sensing optical cable body to be installed.

[0019] like Figure 3 As shown, the central dehumidification duct is a hexagonal structural member, and ventilation slot groups are respectively provided on the six faces of the central dehumidification duct. Any ventilation slot group includes two ventilation slots 13 arranged throughout the length, and the ventilation slots 13 are connected to the inner cavity of the central dehumidification duct, and the wind enters the central dehumidification duct through the ventilation slots. A plurality of ball bins 14 arranged throughout the length are provided on the inner wall of the central dehumidification duct, and the plurality of ball bins 14 are evenly distributed circumferentially along the inner wall of the central dehumidification duct. A ball 16 is respectively provided in any ball bin, and the ball 16 is in contact with the outer surface of the sensing optical cable body 12, and the ball assists the sensing optical cable body to move in the central dehumidification duct. A plurality of grooves 17 evenly distributed circumferentially are respectively provided at the ends of the central dehumidification duct, and the grooves 17 correspond to the ball bins 14. The end of the central dehumidification duct 11 is covered with an annular limit cover 18, and the outer periphery of the limit cover 18 is provided with limit blocks 15 matching the grooves. The limit blocks 15 are embedded in the grooves 17, and then the limit cover 18 is fixed to the end of the central dehumidification duct 11 by screws to seal the ball chamber and ensure the normal operation of the balls.

[0020] The distance between the outer wall of the sensing optical cable body and the inner wall of the central dehumidification duct is 3-5mm, the diameter of the ball is 7-11mm, the inner wall of the central dehumidification duct does not contact the outer wall of the sensing optical cable body and there is a gap, which ensures the ventilation effect.

[0021] like Figure 4 As shown, the sensing optical cable body 12 includes a sensing optical fiber bundle 19, a metal armor tube 20 is sleeved on the sensing optical fiber bundle 19, and an outer layer reinforcement member 21 is sleeved on the metal armor tube 20. The sensing optical fiber bundle is protected by the metal armor tube, and the outer layer reinforcement member is convenient for welding between the outer layer reinforcement members during replacement. It is worth noting that during the replacement process, the outer layer reinforcement members are welded by spot welding instead of full range welding. The spot welding method ensures the connection between the outer layer reinforcement members, and it is also more convenient to separate the outer layer reinforcement members after the replacement is completed.

[0022] A method for laying out a laying structure of a built-in suspension bridge sensing optical cable for a main cable of a suspension bridge comprises the following steps: Step 1: The first pay-off drum is set in an anchor chamber, the second take-up drum is set in another anchor chamber, the second pay-off drum is set at the saddle on the same side as the second take-up drum, and the first take-up drum is set at the saddle on the same side as the first pay-off drum. One end of the outer layer reinforcement member on the sensing optical cable at a side span position is spot-welded to an outer layer reinforcement member of the sensing optical cable to be installed on the first pay-off drum, and the other end of the outer layer reinforcement member on the sensing optical cable at a side span position is connected to a connecting rope on the first take-up drum. One end of the outer layer reinforcement member on the sensing optical cable at the mid-span position is connected to another connecting rope on the first take-up drum, and the other end of the outer layer reinforcement member on the sensing optical cable at the mid-span position is spot-welded to an outer layer reinforcement member on the sensing optical cable to be installed on the second pay-off drum. One end of the outer reinforcement member of the sensing optical cable at the other side span position is spot welded to another outer reinforcement member of the sensing optical cable to be installed on the second pay-off drum, and the other end of the outer reinforcement member of the sensing optical cable at the other side span position is connected to a connecting rope on the second take-up drum.

[0023] Step 2: Rotate two sets of pay-off reels and two sets of take-up reels at a synchronous speed. The two reels of the second pay-off reel pay out the wire synchronously, and the two reels of the first take-up reel take up the wire synchronously, and then coordinate the pay-off of the first pay-off reel with the take-up of the second take-up reel.

[0024] Step 3: With the pulling force of the take-up reel, the sensing optical cable body in the central dehumidification duct is pulled outward, and the ball assists the sensing optical cable body to slide out of the central dehumidification duct, while the sensing optical fiber body to be installed released by the pay-off reel moves toward the central dehumidification duct, and the ball assists the sensing optical cable body to move into the central dehumidification duct, thereby synchronously replacing the sensing optical cable body at the middle span and both side spans.

[0025] Step 4: After the replacement is completed, separate the spot welds between the outer reinforcements.

[0026] The cable strands are arranged more compactly by adopting a hexagonal honeycomb integrated structure, thereby increasing the overall mechanical strength. At the same time, a central dehumidification duct is set at the center of the main cable, which can dry the cable strands and reduce rainwater rust, thereby extending the service life. Three sections of sensing optical cable bodies are set in the central dehumidification duct, which are located at the middle span and both side spans respectively. The cable strand units are separated by the saddle grooves on the saddle, so that the central dehumidification duct exposes the saddle, which achieves the purpose of ventilation on the one hand and facilitates the replacement of the sensing optical cable body by the layout mechanism on the other hand. The sensing optical cable body monitors the main cable. When replacing, the layout mechanism and the ball bearing cooperate to greatly reduce the friction of replacement, improve the replacement efficiency, and avoid the influence on the distribution of the cable strands in the main cable during replacement.

[0027] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A layout structure of an internal suspension bridge sensing optical cable for a main cable of a suspension bridge, characterized in that: It comprises a suspension bridge body, a main cable and a laying mechanism, wherein the suspension bridge body comprises two symmetrically arranged cable towers, a middle span is arranged between the two cable towers, side spans are arranged on both sides of the middle span, cable saddles are arranged on the tops of the cable towers, the main cables are evenly laid on the middle span and the two side spans, anchor chambers are arranged at both ends of the main cables, and the anchor chambers are fixedly connected to the ground; The laying mechanism includes two groups of take-up reels and two groups of pay-off reels, the take-up reels are the first take-up reel and the second take-up reel, the pay-off reels are the first pay-off reel and the second pay-off reel, the first take-up reel and the first pay-off reel are arranged on the same side, and the second take-up reel and the second pay-off reel are arranged on the same side; the first take-up reel is arranged at a saddle, and the second pay-off reel is arranged at another saddle, the first pay-off reel is arranged in an anchor chamber, and the second take-up reel is arranged in another anchor chamber, the first take-up reel and the second take-up reel are respectively wound with connecting ropes, and the first pay-off reel and the second pay-off reel are respectively wound with sensing optical cable bodies to be installed; The main cable includes multiple groups of cable strand units, the cable saddle is provided with a saddle groove, the cable strand unit is arranged in the saddle groove, and the two ends of the cable strand unit are respectively fixed in the anchor chamber through anchor rods; multiple sections of central dehumidification pipes are provided in the center of the cable strand unit, and sensing optical cable bodies are respectively inserted in the central dehumidification pipes, and both ends of the central dehumidification pipes are exposed and extended at the cable saddle, and the laying mechanism replaces the sensing optical cable body in the central dehumidification pipe.

2. The arrangement structure of the built-in suspension bridge sensing optical cable for the main cable of a suspension bridge according to claim 1 is characterized in that: The first wire take-up drum and the second wire pay-off drum arranged at the saddle respectively include two wire drums, and the two wire drums rotate independently.

3. The arrangement structure of the built-in suspension bridge sensing optical cable for the main cable of a suspension bridge according to claim 1 is characterized in that: The cable strand units respectively include a plurality of tightly fitted cable strands, and the plurality of cable strands are wrapped by an outer sheath.

4. The arrangement structure of the built-in suspension bridge sensing optical cable for the main cable of a suspension bridge according to claim 3 is characterized in that: The cross section of the cable strand unit is hexagonal.

5. The arrangement structure of the built-in suspension bridge sensing optical cable for the main cable of a suspension bridge according to claim 1, characterized in that: A plurality of ventilation slots are provided on the central dehumidification duct, and any ventilation slot group includes two ventilation slots arranged throughout the entire length; a plurality of ball bins are provided on the inner wall of the central dehumidification duct, and the plurality of ball bins are evenly distributed in a circumferential direction; balls are respectively arranged in any of the ball bins, and the balls are in contact with the outer surface of the sensing optical cable body; a limit cover is provided at the end cover of the central dehumidification duct.

6. The arrangement structure of the built-in suspension bridge sensing optical cable for the main cable of a suspension bridge according to claim 5, characterized in that: The ends of the central dehumidification pipe are respectively provided with a plurality of grooves uniformly distributed in an annular direction, the grooves correspond to the ball bins, and the outer peripheries of the limit covers are respectively provided with limit blocks matching the grooves, and the limit blocks are embedded in the grooves.

7. The arrangement structure of the built-in suspension bridge sensing optical cable for the main cable of a suspension bridge according to claim 5, characterized in that: The distance between the outer wall of the sensing optical cable body and the inner wall of the central dehumidification pipe is 3-5 mm, and the diameter of the ball is 7-11 mm.

8. The arrangement structure of the built-in suspension bridge sensing optical cable for the main cable of a suspension bridge according to claim 1, characterized in that: The sensing optical cable body comprises a sensing optical fiber bundle, a metal armor tube is sleeved on the sensing optical fiber bundle, and an outer layer reinforcement member is sleeved on the metal armor tube.

9. A method for laying a laying structure of a built-in suspension bridge sensing optical cable for a main cable of a suspension bridge according to any one of claims 1 to 8, characterized in that: The deployment method comprises the following steps: Step 1: The first pay-off drum is arranged in an anchor chamber, the second take-up drum is arranged in another anchor chamber, the second pay-off drum is arranged at the saddle at the same side position as the second take-up drum, and the first take-up drum is arranged at the saddle arranged on the same side as the first pay-off drum; one end of the outer layer reinforcement member of the sensing optical cable at one side span position is connected to an outer layer reinforcement member of the sensing optical cable to be installed on the first pay-off drum, and the other end of the outer layer reinforcement member of the sensing optical cable at one side span position is connected to a connecting rope on the first take-up drum; one end of the outer layer reinforcement member of the sensing optical cable at the mid-span position is connected to another connecting rope on the first take-up drum, and the other end of the outer layer reinforcement member of the sensing optical cable at the mid-span position is connected to an outer layer reinforcement member of the sensing optical cable to be installed on the second pay-off drum; one end of the outer layer reinforcement member of the sensing optical cable at the other side span position is connected to another outer layer reinforcement member of the sensing optical cable to be installed on the second pay-off drum, and the other end of the outer layer reinforcement member of the sensing optical cable at the other side span position is connected to a connecting rope on the second take-up drum; Step 2: Rotate two sets of pay-off reels and two sets of take-up reels at a synchronous speed, the two reels of the second pay-off reel pay out the wire synchronously, the two reels of the first take-up reel take up the wire synchronously, and then coordinate the pay-off of the first pay-off reel with the take-up of the second take-up reel; Step 3: With the pulling force of the take-up reel, the sensing optical cable body in the central dehumidification pipe is pulled outward, and the ball assists the sensing optical cable body to slide out of the central dehumidification pipe, while the sensing optical fiber body to be installed released by the pay-off reel moves toward the central dehumidification pipe, and the ball assists the sensing optical cable body to move into the central dehumidification pipe, thereby synchronously replacing the sensing optical cable bodies at the mid-span and both side spans; Step 4: After the replacement is completed, separate the outer reinforcements.

10. The method for laying out a laying structure of a built-in suspension bridge sensing optical cable for a main cable of a suspension bridge according to claim 9, characterized in that: The upper outer layer reinforcement member of the sensing optical cable is connected to the upper outer layer reinforcement member of the sensing optical cable to be installed by spot welding.

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