Intelligent inhaul cable with mapping cable force function

Abstract

The utility model relates to rigging technical field, especially a kind of wisdom inlay with mapping cable force function, including cable body, fiber grating sensor, anchorage, sensor armoured lead-out wire, sensor output connector and casting body.The cable body is twisted from multiple steel wires.The fiber grating sensor is arranged between the steel wire in the inner layer of one end or both ends of the cable body.The anchorage is provided with cavity and is sleeved in both ends of the cable body, and the fiber grating sensor is located in one or two cavities.The one end of the sensor armoured lead-out wire is connected with the fiber grating sensor, and the other end extends to the outside of the anchorage.The sensor output connector is connected with the one end of the sensor armoured lead-out wire away from the fiber grating sensor.The casting body is cast in the cavity of the anchorage, and the fiber grating sensor and the steel wire of the cable body end are fixed in the cavity of the anchorage.

Description

Technical Field

[0001] This utility model relates to the field of rigging technology, and more specifically, to a smart cable with a force mapping function. Background Technology

[0002] With the continuous development of my country's economy and the advancement of technology, important civil engineering structures such as bridges and long-span steel structures are becoming increasingly large and complex. During long-term use, they are susceptible to damage from material aging, corrosion, loads, and natural disasters. Simultaneously, prestressed cable structures may experience stress relaxation during long-term service. To ensure the safety of bridges and steel structures, real-time monitoring of bridge cables, steel structure cables, and the environment is necessary to promptly identify and address potential safety hazards. Traditional building materials are insufficient for monitoring, and the segmented design of monitoring systems and structural components increases system complexity. Therefore, there is an urgent need for steel structure cables capable of real-time stress monitoring. Utility Model Content

[0003] This invention aims to overcome the problems of existing stress monitoring sensors being placed on the outside of steel structure cables, and the separation design of the monitoring system and structural components, which increases the complexity of the system and makes real-time monitoring inconvenient. It provides a smart cable with cable force mapping function.

[0004] The objective of this utility model is achieved through the following technical solution: A smart cable with a force mapping function includes a cable body, a fiber Bragg grating sensor, an anchor, a sensor armor lead wire, a sensor output connector, and a casting body. The cable body is made of multiple twisted steel wires. The fiber Bragg grating sensor is disposed in the middle of the inner layer of the steel wires at one or both ends of the cable body. The anchor has a cavity and is fitted over both ends of the cable body, with the fiber Bragg grating sensor located in one or both cavities. One end of the sensor armor lead wire is connected to the fiber Bragg grating sensor, and the other end extends to the outside of the anchor. The sensor output connector is connected to the end of the sensor armor lead wire furthest from the fiber Bragg grating sensor. The casting body is poured into the cavity of the anchor, fixing the fiber Bragg grating sensor and the steel wires at the ends of the cable body within the cavity of the anchor.

[0005] Furthermore, the casting body is made of epoxy resin casting material with AB components.

[0006] Furthermore, the epoxy resin casting material of the AB component is Wirelock casting material.

[0007] Furthermore, the outer side of the sensor armor lead wire, in contact with the casting body, is wrapped with a protective layer.

[0008] Furthermore, before the casting body is poured, the fiber optic grating sensor and the sensor armor lead wire are fixed to the steel wire by adhesive.

[0009] Furthermore, the outer side of the cable body between the two anchors is wrapped with a wrapping layer.

[0010] Furthermore, the protective layer extends to the outside of the casting body.

[0011] Compared with the prior art, the beneficial effects of this utility model are: The fiber optic grating sensor and the cable wire are cast together with the castable refractory and fixed in the anchorage, so that the fiber optic grating sensor and the castable refractory in the anchorage deform in tandem. By establishing a functional relationship between the deformation of the fiber optic grating sensor in the castable refractory and the cable force, the cable force of the building structure can be monitored. Under the protection and connection of the castable refractory and the sensor armor lead wire, the integration and intelligence of building materials and monitoring equipment are realized, making the monitoring more direct and efficient. The monitoring is closely integrated with the building materials themselves, which improves the accuracy and reliability of the data, meets the market demand for new smart building materials that can be monitored, and saves the cost of external sensors and cable sensors, which meets market and cost requirements.

[0012] Epoxy resin casting refractories have higher elasticity than traditional zinc-copper alloy casting refractories and can solidify at room temperature. The casting process no longer requires the use of a crucible for heating and melting, reducing the impact of high temperatures on the sensor during casting and minimizing the risks associated with the casting process. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a cross-sectional view of the intelligent cable with the function of mapping cable force in this utility model.

[0014] Figure 2 This is a schematic diagram of the structure of the smart cable with the function of mapping cable force in the second embodiment.

[0015] Figure 3 This is a schematic diagram of the structure of the smart cable with the function of mapping cable force in the third embodiment.

[0016] In the diagram: 1. Cable body; 2. Steel wire; 3. Fiber optic grating sensor; 4. Anchor; 5. Sensor armor lead wire; 6. Sensor output connector; 7. Casting body; 8. Protective layer; 9. Wrapping layer. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0018] like Figure 1 As shown, the smart cable with the function of mapping cable force in this embodiment includes a cable body 1, a fiber optic grating sensor 3, an anchor 4, a sensor armor lead wire 5, a sensor output connector 6, and a casting body 7.

[0019] The cable body 1 is made of multiple twisted steel wires 2. A fiber Bragg grating sensor 3 is located in the middle of the inner layer of the inner steel wires 2 at one or both ends of the cable body 1. An anchor 4 has a cavity and is fitted over both ends of the cable body 1, with the fiber Bragg grating sensor 3 located in one or two of the cavities. One end of the sensor armor lead wire 5 is connected to the fiber Bragg grating sensor 3, and the other end extends to the outside of the anchor 4. A sensor output connector 6 is connected to the end of the sensor armor lead wire 5 furthest from the fiber Bragg grating sensor 3. A casting 7 is poured into the cavity of the anchor 4, fixing the fiber Bragg grating sensor 3 and the steel wires 2 at the ends of the cable body 1 within the cavity of the anchor 4.

[0020] In this embodiment, the casting body 7 uses an AB-component epoxy resin casting material, specifically Wirelock casting material. Wirelock casting material is a cold-curing knot adhesive manufactured by Millfield Enterprises in the UK, suitable for the installation of wire rope knots. Unlike traditional zinc alloy casting processes, this product solidifies at room temperature, avoiding high-temperature damage to the wire rope and thus providing higher safety.

[0021] In this embodiment, a protective layer 8 is wrapped around the contact portion between the outer side of the sensor armor lead wire 5 and the casting body 7, extending to the outer side of the casting body 7. By providing the protective layer 8, damage to the sensor armor lead wire 5 by the steel wire 2 during the casting process is effectively prevented. Before casting the casting body 7, the fiber optic grating sensor 3 and the sensor armor lead wire 5 are fixed to the steel wire 2 by adhesive bonding, thereby ensuring the fixation of the fiber optic grating sensor 3 and the sensor armor lead wire 5 during the casting process and preventing displacement. A wrapping layer 9 is wrapped around the outer side of the cable body 1 between the two anchors 4.

[0022] In practical applications, such as Figure 2 and Figure 3 As shown, different types of anchors can be selected according to usage requirements.

[0023] This embodiment also provides a method for manufacturing the above-mentioned smart cable with the function of mapping cable force, including the following steps: S1. Twisted rope body 1; S2. Place and fix fiber optic grating sensor 3: According to the cavity length of anchor 4, leave a casting length at both ends of cable body 1. After the steel wire 2 within the casting length is unraveled, place and fix fiber optic grating sensor 3 in the inner layer of steel wire 2. The sensor armor lead wire 5 connected to fiber optic grating sensor 3 extends to the outside of steel wire 2 within the casting length. S3. Anchor sleeve 4; S4. Casting casting body 7, casting body 7 is made of Wirelock casting material.

[0024] Preferably, in step S2, when placing the fiber Bragg grating sensor 3, the outermost steel wire 2 is stripped, the fixed position of the fiber Bragg grating sensor 3 is as close as possible to the middle of the anchor 4, the fiber Bragg grating sensor 3 and the sensor armor lead wire 5 are fixed to the inner steel wire 2 by adhesive, and the sensor armor lead wire 5 is wrapped with a protective layer 8 on the outside.

[0025] Preferably, in step S3, before pouring, clamps are used to hold the cable body 1 inside the anchor 4, and sealant is used to seal the bottom of the anchor 4. The sealing strip is made of putty or clay-based putty.

[0026] The cable force monitoring method for smart cables with cable force mapping function in this embodiment specifically includes the following steps: S1. Apply a calibration tension to the smart cable, increasing the calibration tension sequentially, and record the wavelength data output by the fiber Bragg grating sensor under each calibration tension.

[0027] The calibration tension and corresponding wavelength in this embodiment are shown in Table 1: Table 1 S2. Establish the functional relationship between wavelength and tensile force, and fit the force values ​​under different stress states and the wavelength data output by the fiber optic grating sensor into a functional relationship formula, specifically using polynomial fitting, multiple fitting, and other methods.

[0028] Specifically, in this embodiment, the data is fitted based on the data in Table 1: The first-order polynomial fit yields the linear model Poly1 as follows: The coefficients were p1=413.7, p2=166.6, and R-squared was 0.98135, indicating a poor fit.

[0029] The polynomial fit is quadratic, and the linear model Poly2 is: The coefficients were obtained as p1=-89.79, p2=689.7, p3=14.01, and R-squared=1, indicating a good fit. The formula for the functional relationship between wavelength and tensile force was derived as follows: .

[0030] S3. Verify the functional relationship formula in step S2. Apply verification tension to the smart cable sequentially, with the verification tension values ​​increasing sequentially. Record the wavelength data output by the fiber optic grating sensor. The verification tension values ​​and corresponding wavelength data are shown in Table 2: Table 2

[0031] Then, the calculated tensile force is obtained according to the functional relationship formula between the wavelength value and S2. The calculated tensile force is compared with the verified tensile force to obtain the error between the calculated tensile force and the verified tensile force. The verified tensile force, calculated tensile force, and error in this embodiment are shown in Table 3: Table 3

[0032] The maximum error between the calculated and verified tensile force values ​​was 7‰, which is a very good result.

[0033] S4. When it is necessary to monitor the actual cable force of the smart cable after use, record the real-time wavelength data of the fiber optic grating sensor and calculate it according to the functional relationship formula established in S2.

[0034] In this embodiment, the smart cable with cable force mapping function is constructed by casting fiber optic grating sensors and cable wires together with castable refractory material and fixing them in the anchorage. This allows the fiber optic grating sensors and the castable refractory material in the anchorage to deform in tandem. By establishing a functional relationship between the deformation of the fiber optic grating sensors within the castable refractory material and the cable force, cable force monitoring of the building structure can be achieved. Under the protection and connection of the castable refractory material and the sensor armored lead wires, the integration and intelligence of building materials and monitoring equipment are realized, making monitoring more direct and efficient. The monitoring is closely integrated with the building materials themselves, improving the accuracy and reliability of the data, meeting the market demand for new smart building materials that can be monitored, and saving the cost of external sensors and cable sensors, which meets market and cost requirements.

[0035] Epoxy resin casting refractories have higher elasticity than traditional zinc-copper alloy casting refractories and can solidify at room temperature. The casting process no longer requires the use of a crucible for heating and melting, reducing the impact of high temperatures on the sensor during casting and minimizing the risks associated with the casting process.

[0036] By connecting to external devices through the sensor output connector and outputting data, the force values ​​under different stress states and the signal values ​​of the fiber optic grating sensor are fitted into a functional relationship formula, ultimately realizing real-time monitoring of cable forces and other parameters of structural components.

[0037] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A smart cable with a force mapping function, characterized in that, include: The cable body (1) is made of multiple steel wires (2) twisted together; Fiber optic grating sensor (3), wherein the fiber optic grating sensor (3) is disposed in the middle of the inner layer of the steel wire (2) at one or both ends of the cable body (1); Anchor (4), the anchor (4) is provided with a cavity and sleeved on both ends of the cable (1), and the fiber optic grating sensor (3) is located in one or two of the cavities; Sensor armor lead wire (5), one end of which is connected to the fiber optic grating sensor (3), and the other end extends to the outside of the anchor (4); Sensor output connector (6), wherein the sensor output connector (6) is connected to the end of the sensor armor lead (5) away from the fiber Bragg grating sensor (3); and Casting body (7), the casting body (7) is cast into the cavity of the anchor (4) to fix the fiber optic grating sensor (3) and the steel wire (2) at the end of the cable (1) into the cavity of the anchor (4).

2. The smart cable with mapping cable force function according to claim 1, characterized in that, The casting body (7) is an epoxy resin casting material with AB components.

3. The smart cable with mapping cable force function according to claim 2, characterized in that, The epoxy resin casting material of the AB component is Wirelock casting material.

4. The smart cable with mapping cable force function according to claim 1, characterized in that, The outer part of the sensor armor lead wire (5) that contacts the casting body (7) is covered with a protective layer (8).

5. The smart cable with mapping cable force function according to claim 1, characterized in that, Before the casting body (7) is cast, the fiber optic grating sensor (3) and the sensor armor lead wire (5) are fixed to the steel wire (2) by adhesive.

6. The smart cable with mapping cable force function according to claim 1, characterized in that, The cable body (1) between the two anchors (4) is wrapped with a wrapping layer (9).

7. The smart cable with mapping cable force function according to claim 4, characterized in that, The protective layer (8) extends to the outside of the casting body (7).

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