High-tolerance sensing optical cable structure suitable for laying asphalt pavement layer

Abstract

The invention relates to a high-tolerance sensing optical cable structure suitable for laying an asphalt pavement layer, which comprises a sensing optical fiber, an anti-impact layer, a metal stranded layer, a metal armor layer and an outer sheath layer, and is characterized in that the anti-impact layer wraps the sensing optical fiber; the metal stranded layer wraps the anti-impact layer; the metal armor layer wraps the metal stranded layer. The outer sheath layer wraps the metal armor layer. When the asphalt pavement material is damaged by a vehicle, the sensing optical cable is exposed, so that under the wrapping constraint of the metal armor layer and the outer sheath layer, the steel wire of the metal stranded layer can be effectively prevented from being in contact with a running tire to cause a potential safety hazard of passing; meanwhile, when the asphalt pavement is paved, the outer sheath layer is softened in a high-temperature environment, and the outer sheath layer is tightly attached to the asphalt under the rolling compaction of engineering machinery, so that the overall coupling property is improved, and the transmission effectiveness of temperature and vibration signals is enhanced.

Description

Technical Field

[0001] The present invention relates to the field of distributed optical fiber sensing technology, and in particular to a high-tolerance sensing optical cable structure suitable for laying on asphalt road surface layers. Background Art

[0002] Due to its technical characteristics of "large capacity", "long distance", "high precision" and "high reliability", the grating array distributed fiber optic sensing technology, after being paved at the lane level on the highway pavement, has endowed the highway with "tactile" perception function from a new dimension, pushing the intelligent highway perception technology to a higher level.

[0003] During asphalt pavement construction, not only the tight coupling between the detection optical cable and the asphalt pavement material must be considered, but also the rolling of large-scale construction machinery during asphalt pavement construction and the high temperature of asphalt materials when leaving the factory must be considered. At the same time, it is necessary to improve the safety of vehicle traffic after the asphalt pavement is damaged. Conventional buried detection optical cables obviously do not meet the above-mentioned high-pressure and high-temperature construction requirements.

[0004] In summary, solving the high tolerance and safety issues of detection optical cables during asphalt layer construction on highways is the core key to the large-scale promotion and application of distributed fiber optic sensing technology in the field of smart highways. Summary of the invention

[0005] In view of this, it is necessary to provide a high-tolerance sensing optical cable structure suitable for asphalt road surface laying to solve the high tolerance and safety problems of the detection optical cable during the construction of the asphalt layer of the highway.

[0006] The present invention provides a high-tolerance sensing optical cable structure suitable for asphalt pavement laying, comprising a sensing optical fiber, an impact-resistant layer, a metal twisted layer, a metal armor layer and an outer sheath layer, wherein the impact-resistant layer wraps the sensing optical fiber; the metal twisted layer wraps the impact-resistant layer; the metal armor layer wraps the metal twisted layer; the outer sheath layer wraps the metal armor layer, and the outer sheath layer is configured to soften after heating, deform under extrusion and fit tightly with asphalt.

[0007] Furthermore, the sensing optical fiber is a high temperature resistant grating array sensing optical fiber or a high temperature resistant distributed sensing optical fiber.

[0008] Furthermore, the impact-resistant layer includes an inner seamless welded pipe, and the inner seamless welded pipe is arranged at a position between the sensing optical fiber and the metal twisted layer.

[0009] Furthermore, it also includes hydrogen fiber paste filling filled between the sensing optical fiber and the inner seamless welded pipe.

[0010] Furthermore, the wall thickness of the inner layer seamless welded pipe is not greater than 0.3 mm.

[0011] Furthermore, the impact-resistant layer comprises an outer seamless welded pipe, and the outer seamless welded pipe is arranged at a position between the inner seamless welded pipe and the metal twisted layer.

[0012] Furthermore, the inner layer seamless welded pipe and the outer layer seamless welded pipe are both stainless steel strips formed by longitudinal wrapping welding.

[0013] Furthermore, the inner layer seamless welded pipe and the outer layer seamless welded pipe are tightly fitted.

[0014] Furthermore, the metal armor layer is a rubber-coated steel strip.

[0015] Furthermore, the outer sheath layer is a PE tube.

[0016] Compared with the prior art, the anti-impact layer provided can provide the optical cable structure with good mechanical impact tolerance, and the metal twisted layer provides the optical cable structure with anti-punch ability, while also enhancing the overall bending and tensile properties of the optical cable structure. The above-mentioned arrangement enables the optical cable structure to meet the high tolerance requirements during the construction of asphalt layers on highways. When the asphalt pavement material is damaged by a vehicle, the sensing optical cable is exposed. Therefore, under the wrapping and restraint of the metal armor layer and the outer sheath layer, the steel wire of the metal twisted layer can be effectively prevented from contacting the vehicle tires and causing a potential safety hazard to traffic. At the same time, when the asphalt pavement is paved, the outer sheath layer softens in a high temperature environment, and under the rolling of engineering machinery, the outer sheath layer fits tightly with the asphalt, thereby improving the overall coupling and enhancing the effectiveness of the transmission of temperature and vibration signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the overall structure of a high-tolerance optical sensing cable structure suitable for laying on an asphalt road surface provided by an embodiment of the present invention; Figure 2 A schematic cross-sectional view of the entire structure of a high-tolerance optical sensing cable suitable for asphalt pavement laying provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0019] like Figure 1-2As shown, the present invention provides a high-tolerance sensing optical cable structure suitable for asphalt pavement laying, including a sensing optical fiber 100, an impact-resistant layer 200, a metal twisted layer 300, a metal armor layer 400 and an outer sheath layer 500, wherein the impact-resistant layer 200 wraps the sensing optical fiber 100; the metal twisted layer 300 wraps the impact-resistant layer 200; the metal armor layer 400 wraps the metal twisted layer 300; the outer sheath layer 500 wraps the metal armor layer 400, and the outer sheath layer 500 is configured to soften after heating, deform under extrusion and fit tightly with asphalt.

[0020] During implementation, the impact-resistant layer 200 is provided to provide the optical cable structure with good mechanical impact tolerance, and the metal twisted layer 300 provides the optical cable structure with anti-punch ability while enhancing the overall bending and tensile properties of the optical cable structure. The above-mentioned arrangement enables the optical cable structure to meet the high tolerance requirements during the construction of the asphalt layer of the highway. When the asphalt pavement material is damaged by a vehicle, the sensing optical cable is exposed. Therefore, under the wrapping and restraint of the metal armor layer 400 and the outer sheath layer 500, the steel wire of the metal twisted layer 300 can be effectively prevented from contacting the vehicle tires to cause a traffic safety hazard. At the same time, when the asphalt pavement is paved, the outer sheath layer 500 softens in a high temperature environment, and under the rolling of engineering machinery, the outer sheath layer 500 fits tightly with the asphalt, thereby improving the overall coupling and enhancing the transmission effectiveness of temperature and vibration signals.

[0021] The sensing optical fiber 100 in this embodiment is a high temperature resistant grating array sensing optical fiber or a high temperature resistant distributed sensing optical fiber. Its coating layer material is modified polyacrylate or polyimide, and its short-term high temperature tolerance reaches above 180°C, which can ensure that the sensing optical fiber 100 maintains effective sensing function under the high temperature of asphalt pavement material paving.

[0022] The impact-resistant layer 200 in this embodiment is disposed to wrap the sensing optical fiber 100, which can provide good mechanical impact resistance for the optical cable structure.

[0023] In one embodiment, the impact-resistant layer 200 includes an inner seamless welded tube 210, which is disposed between the sensing optical fiber 100 and the metal stranded layer 300. The inner seamless welded tube 210 is made by a cold-drawn hardening springback process, so that the sensing optical fiber 100 inside the inner seamless welded tube 210 forms an excess length that meets the use requirements, and the excess length is controlled by adjusting the pay-off tension and the cold-drawing tension of the sensing optical fiber 100.

[0024] When the sensing optical fiber 100 is a temperature sensing optical fiber, the inner seamless welded tube 210 in this embodiment adopts a dry unfilled structure to avoid stress cross influence and improve temperature measurement accuracy; when the sensing optical fiber 100 is a vibration sensing optical fiber, in order to improve the effective transmission of vibration signals and their transmission uniformity, the optical cable structure in this embodiment also includes hydrogen fiber paste filling between the sensing optical fiber 100 and the inner seamless welded tube 210.

[0025] Due to the limitation of the wall thickness of the inner seamless welded pipe 210, the anti-impact strength provided by the inner seamless welded pipe 210 is not enough for the heavy mechanical impact during asphalt pavement paving. Therefore, in one embodiment, the impact-resistant layer 200 includes an outer seamless welded pipe 220, which is arranged between the inner seamless welded pipe 210 and the metal stranded layer 300. The thickness of both the inner seamless welded pipe 210 and the outer seamless welded pipe 220 is not greater than 0.3 mm.

[0026] Among them, the inner seamless welded pipe 210 and the outer seamless welded pipe 220 are both stainless steel strips formed by longitudinal wrapping welding. The inner seamless welded pipe 210 and the outer seamless welded pipe 220 are tightly fitted together through cold drawing and hardening. The double-layer welded pipe structure formed by the inner seamless welded pipe 210 and the outer seamless welded pipe 220 can provide higher mechanical impact resistance for the optical cable structure.

[0027] Although the above-mentioned double-layer seamless welded pipe structure has sufficient anti-punching ability, its overall flexibility, tensile strength and bending resistance are relatively poor. Therefore, in this embodiment, a metal twisted layer 300 is designed outside the impact-resistant layer 200. The metal twisted layer 300 can be made of galvanized steel wire, aluminum-clad steel wire, phosphating steel wire or stainless steel wire and is made by S twisting or SZ twisting process, which further provides anti-punching ability for the optical cable structure, and at the same time can enhance the bending performance and tensile resistance of the overall optical cable structure.

[0028] The metal armor layer 400 in this embodiment is a rubber-coated steel strip. The metal armor layer 400 can be processed by embossing to improve its flexibility.

[0029] The outer sheath layer 500 in this embodiment is a PE tube. Of course, the outer sheath layer 500 can also be made of other materials that soften under high temperature conditions.

[0030] Compared with the prior art: the impact-resistant layer 200 is provided to provide the optical cable structure with good mechanical impact tolerance, and the metal twisted layer 300 provides the optical cable structure with anti-punch ability while enhancing the overall bending and tensile properties of the optical cable structure. The above-mentioned arrangement enables the optical cable structure to meet the high tolerance requirements during the construction of the asphalt layer of the highway. When the asphalt pavement material is damaged by a vehicle, the sensing optical cable is exposed. Therefore, under the wrapping and restraint of the metal armor layer 400 and the outer sheath layer 500, the steel wire of the metal twisted layer 300 can be effectively prevented from contacting the vehicle tires to cause a traffic safety hazard. At the same time, when the asphalt pavement is paved, the outer sheath layer 500 softens in a high temperature environment, and under the rolling of engineering machinery, the outer sheath layer 500 fits tightly with the asphalt, thereby improving the overall coupling and enhancing the effectiveness of the transmission of temperature and vibration signals.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A high-tolerance sensor optical cable structure suitable for laying on asphalt pavement, characterized in that: include: Sensing fiber; an impact-resistant layer wrapping the sensing optical fiber arrangement; A metal stranded layer, which wraps around the impact-resistant layer; A metal armor layer, which wraps the metal twisted layer; The outer sheath layer is arranged to wrap the metal armor layer, and the outer sheath layer is configured to be softened after being heated, and to be deformed under extrusion and closely fit with the asphalt.

2. The high-tolerance sensor optical cable structure suitable for asphalt pavement laying according to claim 1 is characterized in that: The sensing optical fiber is a high temperature resistant grating array sensing optical fiber or a high temperature resistant distributed sensing optical fiber.

3. The high-tolerance optical sensing cable structure suitable for asphalt pavement laying according to claim 1 is characterized in that: The impact-resistant layer comprises an inner seamless welded pipe, and the inner seamless welded pipe is arranged at a position between the sensing optical fiber and the metal twisted layer.

4. The high-tolerance optical sensing cable structure suitable for asphalt pavement laying according to claim 3 is characterized in that: It also includes a hydrogen fiber paste filler filled between the sensing optical fiber and the inner seamless welded pipe.

5. The high-tolerance optical sensing cable structure suitable for asphalt pavement laying according to claim 3 is characterized in that: The wall thickness of the inner layer seamless welded pipe is not greater than 0.3 mm.

6. The high-tolerance optical sensing cable structure suitable for asphalt pavement laying according to claim 5 is characterized in that: The impact-resistant layer includes an outer seamless welded pipe, and the outer seamless welded pipe is arranged at a position between the inner seamless welded pipe and the metal stranded layer.

7. The high-tolerance optical sensing cable structure suitable for asphalt pavement laying according to claim 6 is characterized in that: The inner layer seamless welded pipe and the outer layer seamless welded pipe are both stainless steel strips formed by longitudinal wrapping welding.

8. The high-tolerance optical sensing cable structure suitable for asphalt pavement laying according to claim 6 is characterized in that: The inner layer seamless welded pipe and the outer layer seamless welded pipe are tightly fitted.

9. The high-tolerance optical sensing cable structure suitable for asphalt pavement laying according to claim 1 is characterized in that: The metal armor layer is a rubber-coated steel strip.

10. The high-tolerance optical sensing cable structure suitable for asphalt pavement laying according to claim 1 is characterized in that: The outer sheath layer is a PE tube.

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