CN110685221A - Intelligent inhaul cable containing rubber-coated optical fibers and manufacturing method thereof - Google Patents

Abstract

The invention relates to an intelligent cable containing an outer rubber optical fiber and a manufacturing method thereof. The intelligent cable includes a plurality of steel wires and at least one intelligent wire, the steel wires and the intelligent wire are twisted together, and the intelligent wire includes an optical fiber and is sleeved on the optical fiber. An outer rubber outer layer that separates the fiber from the steel wire. Compared with the prior art, the smart cable of the present invention solves the problem of insufficient strength of the optical fiber when the optical fiber and the steel wire are twisted together by using the shear strength of the rubber, can measure the stress of the steel wire in real time, and utilizes the high damping characteristic of the rubber at the same time. Effectively reduce the vibration of the cable.

Description

A kind of intelligent cable containing outer rubber optical fiber and manufacturing method thereof

technical field

The invention belongs to the technical field of cable-stayed bridges, and relates to an intelligent stay cable containing an outer rubber optical fiber and a manufacturing method thereof. The intelligent stay cable is used for the stay cable of a cable-stayed bridge.

Background technique

The cable-stayed cable is the lifeline of the cable-stayed bridge, responsible for bearing the static and dynamic loads acting on the bridge structure, and generally needs a service life of more than 30 years. Because the stay cables are arranged outside the beam body and are greatly affected by external factors, the steel wires are prone to corrosion degradation and vibration fatigue degradation during the service process, which seriously affects the durability of the bridge. Therefore, how to realize the real-time monitoring of the long-term working state of the cable and ensure the safety during the service period is the key to the development of modern bridge cable technology.

The existing cable force measurement methods are mainly divided into two types: external detection components and internal implanted detection components. The internal implanted detection component method integrates the sensor and the cable into a whole, so that the cable has the ability to perceive the cable force itself, so it is also called smart cable technology. As a typical representative of smart cable technology, the composite bar (strain sensor) method has many significant progress and advantages, but there are still areas to be improved: 1. During the cable twisting process, the composite bar needs to be twisted together with the single steel wire 2. The actual normal working strain of the cable body part of the cable is about 4000με, while the stable strain work of the existing optical fiber strain sensing element The interval is only below 3500με. When the bridge and cable structure is slightly damaged, or some steel wires in the cable are broken, the strain range of the cable will greatly exceed the strain working range of the existing strain sensing technology.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a smart cable containing an outer rubber optical fiber and a manufacturing method thereof in order to overcome the above-mentioned defects of the prior art. The outer rubber layer wrapped around the optical fiber offsets a part of the working strain of the stay cable through its own shear deformation, and the optical fiber monitors the deformation of the cable under normal working conditions. At the same time, the rubber outer layer also isolates the steel wire and the optical fiber to prevent the high humidity in the steel wire from affecting the normal operation of the optical fiber. In addition, the existence of the rubber outer layer also has the effect of increasing the damping of the cable. When the cable vibrates, the rubber material increases the damping force of the cable through its own compressive deformation, effectively reducing the amplitude.

The object of the present invention can be realized through the following technical solutions:

An intelligent cable containing an outer rubber optical fiber, the intelligent cable includes a plurality of steel wires and at least one intelligent wire, the steel wires and the intelligent wire are twisted together, and the intelligent wire includes an optical fiber and is sleeved on the optical fiber. An outer rubber outer layer that separates the fiber from the steel wire.

Further, the inside of the rubber outer layer is provided with a hole, and the optical fiber is located in the hole. A hole is reserved in the rubber outer layer to accommodate the optical fiber. The reflection wavelength of fiber grating is 1550-1600nm, and the reflectivity is 30-90%.

Further, the inner diameter of the hole is 1-3mm.

Further, an epoxy resin layer is filled between the optical fiber and the outer rubber layer. The epoxy layer is used to glue the fiber in place.

Further, the outer surface of the rubber outer layer is coated with a high temperature resistant coating.

Further, the smart cable also includes a high-strength polyester fiber tape wound around the steel wire and the smart wire at the same time.

Further, the outer cover of the high-strength polyester fiber belt is provided with a high-density polyethylene sheath. The steel wire and smart wire are twisted and wrapped around a high-strength polyester fiber tape, and then hot-extruded high-density polyethylene (PE) to form a high-density polyethylene sheath.

Further, both ends of the intelligent cable are provided with anchors. The anchoring device and the intelligent cable are connected by pouring epoxy resin cold casting.

Further, both ends of the smart cable are provided with an optical time domain reflectometer electrically connected to the optical fiber. The optical time domain reflectometer is electrically connected to the optical fiber through a wire.

A manufacturing method of a smart cable containing an outer rubber optical fiber, the method comprises the following steps:

1) Select the rubber outer layer of the required length, insert the optical fiber into the hole of the rubber outer layer, and reserve lead wires at both ends of the optical fiber;

2) pouring epoxy resin into the channel to form an epoxy resin layer, and gluing the optical fiber in the rubber outer layer to obtain a smart wire;

3) Twist the steel wire and the smart wire together and pass through the anchor;

4) Pour epoxy resin into the anchor;

5) Connect the lead wire of the fiber to the optical time domain reflectometer.

The invention provides an intelligent cable that can monitor the cable force in real time and has damping effect at the same time. The intelligent cable uses the shear strength of the rubber outer layer to solve the problem of insufficient optical fiber strength when the optical fiber and the steel wire are twisted together. The wire stress can be measured in real time, and the vibration of the cable is effectively reduced by utilizing the high damping characteristics of the rubber.

Compared with the prior art, the present invention has the following characteristics:

1) The outer rubber layer offsets part of the axial deformation of the cable through its own shear deformation, so that the optical fiber can monitor the deformation of the cable normally under certain strain conversion conditions. The sensitivity and accuracy of the grating sensor have been greatly improved;

2) When the cable vibrates, the rubber material increases the damping force of the cable through its own compression deformation, effectively reducing the amplitude;

3) The outer layer of rubber isolates the steel wire and the optical fiber to prevent the high humidity in the steel wire from affecting the normal operation of the optical fiber;

4) The intelligent cable has the advantages of long-distance monitoring, low energy dependence, high environmental tolerance, anti-electromagnetic interference, and anti-corrosion.

Description of drawings

Fig. 1 is the cross-sectional structure schematic diagram of the intelligent cable in the present invention;

Fig. 2 is the cross-sectional structure schematic diagram of the smart wire in the present invention;

3 is a schematic diagram of the assembly structure of the intelligent cable and the anchor in the present invention;

Description of marks in the figure:

1—rubber outer layer, 2—optical fiber, 3—hole channel, 4—epoxy resin layer, 5—steel wire, 6—smart wire, 7—lead wire, 8—anchor, 9—optical time domain reflectometer, 10— Smart cable.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and provides a detailed implementation manner and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

Example 1:

As shown in FIG. 2 , a smart cable 10 containing an outer-coated rubber optical fiber is composed of several ordinary steel wires 5 and at least one smart wire 6 . The smart wire 6 is composed of a rubber outer layer 1 , an optical fiber 2 , a channel 3 and an epoxy resin layer 4 .

The manufacturing method of the smart cable 10 includes the following steps:

1) According to the length requirement of the smart cable 10, prefabricate the outer layer 1 of rubber that can withstand high temperature;

2) Insert the optical fiber 2 into the hole 3 of the rubber outer layer 1, and reserve a tail section lead wire 7 of sufficient length;

3) Pour epoxy resin into the channel 3, and glue the optical fiber 2 in the rubber outer layer 1;

4) Twist the common steel wire 5 and the smart wire 6 together, and pass through the anchor 8;

5) Use the cold casting method for anchoring, pouring epoxy resin and performing reverse topping;

6) Connect the lead wire 7 of the optical fiber 2 to the optical time domain reflectometer 9;

The working process of the fiber 2: the light emitted by the light source is modulated by the phase modulator and then incident on the fiber 2 grating. When the stress and temperature of the steel wire 5 change, the optical time domain reflectometer 9 will detect that the wavelength of the fiber 2 grating changes. , and then the stress and temperature change of the steel wire 5 can be determined.

In this embodiment, the reflection wavelength of the optical fiber grating 2 is 1550 nm, the reflectivity is 30%, and the diameter of the reserved hole 3 in the rubber outer layer 1 is 1 mm.

Example 2:

In this embodiment, the reflection wavelength of the optical fiber grating 2 is 1500 nm, the reflectivity is 60%, the diameter of the reserved hole 3 in the rubber outer layer 1 is 2 mm, and the rest are the same as those in Embodiment 1.

Example 3:

In this embodiment, the reflection wavelength of the optical fiber 2 grating is 1600 nm, the reflectivity is 90%, the diameter of the reserved hole 3 in the rubber outer layer 1 is 3 mm, and the rest are the same as those in Embodiment 1.

Example 4:

As shown in FIG. 1 , a smart cable including an outer rubber optical fiber, the smart cable 10 includes a plurality of steel wires 5 and at least one smart wire 6 , and the steel wires 5 and the smart wires 6 are twisted together.

As shown in FIG. 2 , the smart wire 6 includes an optical fiber 2 and a rubber outer layer 1 sheathed outside the optical fiber 2 , and the rubber outer layer 1 separates the optical fiber 2 from the steel wire 5 . The inside of the rubber outer layer 1 is provided with a hole 3 , and the optical fiber 2 is located in the hole 3 . The inner diameter of the channel 3 is 1-3 mm. An epoxy resin layer 4 is filled between the optical fiber 2 and the rubber outer layer 1 .

The outer surface of the rubber outer layer 1 is coated with a high temperature resistant coating. The smart cable 10 also includes a high-strength polyester fiber tape wound around the steel wire 5 and the smart wire 6 at the same time. The outer jacket of the high-strength polyester tape is sheathed with high-density polyethylene.

As shown in FIG. 3 , both ends of the smart cable 10 are provided with anchors 8 . Both ends of the smart cable 10 are provided with an optical time domain reflectometer 9 electrically connected to the optical fiber 2 .

The manufacturing method of the smart cable 10 includes the following steps:

1) Select the rubber outer layer 1 of the required length, and insert the optical fiber 2 into the hole 3 of the rubber outer layer 1, and reserve lead wires 7 at both ends of the optical fiber 2;

2) pour epoxy resin into the tunnel 3 to form an epoxy resin layer 4, and glue the optical fiber 2 in the rubber outer layer 1 to obtain the smart wire 6;

3) twist the steel wire 5 and the smart wire 6 together to obtain the smart cable 10, and pass the two ends of the smart cable 10 through the anchor 8 respectively;

4) Pour epoxy resin into anchor 8;

5) Connect the lead wire 7 of the optical fiber 2 to the optical time domain reflectometer 9 .

The rubber outer layer 1 wrapped around the optical fiber 2 offsets the working strain of a part of the stay cable through its own shear deformation, and the optical fiber 2 monitors the deformation of the cable under normal working conditions. At the same time, the rubber outer layer 1 also isolates the steel wire 5 and the optical fiber 2 to prevent the high humidity in the steel wire 5 from affecting the normal operation of the optical fiber 2 . In addition, the existence of the rubber outer layer 1 also has the effect of increasing the damping of the cable. When the cable vibrates, the rubber material increases the damping force of the cable through its own compressive deformation, effectively reducing the amplitude.

The foregoing description of the embodiments is provided to facilitate understanding and use of the invention by those of ordinary skill in the art. It will be apparent to those skilled in the art that various modifications to these embodiments can be readily made, and the generic principles described herein can be applied to other embodiments without inventive step. Therefore, the present invention is not limited to the above-mentioned embodiments, and improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should all fall within the protection scope of the present invention.

Claims (10)

1. an intelligent cable containing an outer rubber optical fiber, is characterized in that, this intelligent cable (10) comprises a plurality of steel wires (5) and at least one intelligent wire (6), and the steel wire (5) is connected with the intelligent cable (5). The wires (6) are twisted together, and the smart wire (6) includes an optical fiber (2) and a rubber outer layer (1) sleeved on the outside of the optical fiber (2), and the rubber outer layer (1) connects the optical fiber. (2) is separated from the steel wire (5). 2. A kind of intelligent cable containing an outer rubber optical fiber according to claim 1, characterized in that, the inside of the rubber outer layer (1) is provided with a hole (3), and the optical fiber (2) is located in the in the tunnel (3). 3 . The smart cable containing an outer rubber optical fiber according to claim 2 , wherein the inner diameter of the hole ( 3 ) is 1-3 mm. 4 . 4 . The smart cable containing an outer rubber optical fiber according to claim 2 , wherein an epoxy resin layer ( 4 ) is filled between the optical fiber ( 2 ) and the outer rubber layer ( 1 ). 5 . 5 . The smart cable containing an outer rubber optical fiber according to claim 1 , wherein the outer surface of the rubber outer layer ( 1 ) is coated with a high temperature resistant coating. 6 . 6. A kind of intelligent cable containing an outer rubber optical fiber according to claim 1, characterized in that, the intelligent cable (10) also comprises a high-voltage cable that is simultaneously wound around the steel wire (5) and the outside of the intelligent wire (6). Strength polyester tape. 7 . The smart cable containing an outer rubber optical fiber according to claim 6 , wherein the outer cover of the high-strength polyester fiber tape is provided with a high-density polyethylene sheath. 8 . 8 . The smart cable containing an outer rubber optical fiber according to claim 1 , wherein anchors ( 8 ) are provided at both ends of the smart cable ( 10 ). 9 . 9. The intelligent cable containing an outer rubber optical fiber according to claim 1, characterized in that, both ends of the intelligent cable (10) are provided with an optical time domain that is electrically connected to the optical fiber (2). Reflectometer (9). 10. A manufacturing method of the intelligent cable containing the outer rubber optical fiber as claimed in any one of claims 1 to 9, wherein the method comprises the following steps: 1) Select the rubber outer layer (1) of the required length, insert the optical fiber (2) into the hole (3) of the rubber outer layer (1), and reserve lead wires (7) at both ends of the optical fiber (2). ); 2) pouring epoxy resin into the channel (3) to form an epoxy resin layer (4), and gluing the optical fiber (2) in the rubber outer layer (1) to obtain a smart wire (6); 3) twist the steel wire (5) and the smart wire (6) together to obtain the smart cable (10), and pass the two ends of the smart cable (10) through the anchor (8) respectively; 4) pour epoxy resin into the anchor (8); 5) Connect the lead wire (7) of the optical fiber (2) to the optical time domain reflectometer (9).

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