Sensing optical cable suitable for infrastructure catastrophe monitoring
By designing a sensor optical cable containing spiral steel strips, double-layer aramid fibers, metal braided mesh and low-smoke, flame-retardant materials, the existing optical cables cannot meet the long-life, high-reliability, and balanced stress performance requirements in highway bridges and roadbed disaster monitoring, achieving the effect of fracture during disasters and continuous cracking in normal environments, supporting the needs of highway disaster monitoring.
Patent Information
- Application Number
- CN202510099218.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2025-03-21
AI Technical Summary
The existing optical cables cannot meet the long-life, high-reliability, and balanced stress performance requirements of "breaking during disasters and continuous cracking in normal construction and operation environments" during the monitoring of highway bridges and roadbed disasters.
A sensor optical cable is designed, and its cable core consists of a central optical unit, a compressive reinforcement, a tensile reinforcement, a torsion-resistant reinforcement and an outer sheath. The compressive reinforcement is a spiral steel belt, the tensile reinforcement is a double-layer aramid fiber, the torsion-resistant reinforcement is a metal braided mesh, and the outer sheath is a low-smoke, flame-retardant material.
The optical cable can continue to crack in both construction and operation environments, meeting the needs of highway bridges and roadbed disaster monitoring. By accurately identifying breakpoint events, the collapse location can be alerted and positioned as soon as possible to reduce casualties.
Smart Images
Figure CN119667882A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of optical cable technology, and in particular to a sensor optical cable suitable for infrastructure disaster monitoring. Background Art
[0002] Due to the influence of extreme weather, it is necessary to carry out major disaster monitoring on highway bridges, roadbeds and other infrastructure, perceive and obtain the location and impact range of disaster events such as collapse in real time, issue warning information as soon as possible, initiate traffic control and emergency rescue, and minimize casualties.
[0003] The total mileage of expressways in my country is 180,000 kilometers (6,168 kilometers in Fujian Province), with many points and a wide area, complex terrain and climate. There is a lack of a long-distance, large-capacity, distributed, highly reliable, and long-life real-time disaster monitoring networking system suitable for linear projects.
[0004] Optical cables can be used as a carrier for sensing highway disasters and information transmission due to their low cost and mature application in the communication field. However, since optical cables are mainly used in the communication field, the first requirement is to ensure communication quality under various extreme conditions. They do not meet the requirements of long life, high reliability, and balanced stress performance in highway bridge and roadbed disaster monitoring, such as "breaking during disasters and not breaking under normal construction and operation environments". Therefore, in response to the above problems and needs, an optical cable suitable for highway bridge and roadbed disaster monitoring is proposed. Summary of the invention
[0005] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to propose a sensing optical cable with long life, high reliability and balanced force performance that can meet the requirements of "breaking during disasters and not breaking under normal construction and operation environments" in highway bridge and roadbed disaster detection.
[0006] To achieve this object, the present invention adopts the following technical solutions: The present invention provides a sensing optical cable suitable for infrastructure disaster monitoring, comprising a cable core, wherein the cable core comprises a central optical unit, wherein an optical fiber is arranged in the central optical unit, and the outside of the cable core is sequentially coated with a compressive reinforcement member, a first layer of tensile reinforcement member, a torsional reinforcement member, a second layer of tensile reinforcement member and an outer sheath from the inside to the outside.
[0007] A preferred technical solution of the present invention is that the compressive reinforcement member is a spiral steel belt, and the material of the compressive reinforcement member is SUS204.
[0008] A preferred technical solution of the present invention is that both the first layer of tensile reinforcement and the second layer of tensile reinforcement are aramid fibers.
[0009] A preferred technical solution of the present invention is that the torsional reinforcement is a metal woven mesh, and the material of the metal woven mesh is SUS304.
[0010] The preferred technical solution of the present invention is that the cable core adopts 0.6mm tight-buffered optical fiber.
[0011] A preferred technical solution of the present invention is that the outer sheath is made of low-smoke halogen-free flame retardant material, and the thickness of the outer sheath is ≥0.4 mm.
[0012] A preferred technical solution of the present invention is that the optical cable weighs less than 30 kg / km.
[0013] The beneficial effects of the present invention are: Compared with the existing technology, the optical cable has the following beneficial effects: by arranging a spiral steel belt, it provides a stronger compressive resistance, so that it can protect the fiber core from breaking during construction; by arranging a double-layer aramid fiber, a balanced tensile resistance is achieved, which meets the highway bridge and roadbed disaster monitoring needs of "breaking during a disaster, not breaking under normal construction and operation environment"; the second layer of aramid fiber and the spiral steel belt are separated by a metal woven mesh, and when the force generated by the deformation of the roadbed and bridge during operation causes the optical cable to stretch, it is ensured that the spiral steel belt does not cut the second layer of aramid fiber during stretching, which meets the highway bridge and roadbed disaster monitoring needs of "not breaking under normal operation environment"; by using low-smoke halogen-free flame-retardant material for the outer sheath, the optical cable can remain intact at a road operating temperature of 190°C.
[0014] After the optical cable is tightly coupled with the highway roadbed and bridges, since the optical cable meets the monitoring requirements of "breaking during disasters and definitely not breaking under normal construction and operation environments", by accurately identifying breakpoint events caused by disasters such as collapse of the optical cable, the highway operation and management unit can immediately issue an alarm and locate the breakpoint collapse position, thereby reducing casualties. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the structure of a sensor optical cable for disaster monitoring provided in a specific embodiment of the present invention.
[0016] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Central light unit; 2. Compression reinforcement; 3. First layer of tensile reinforcement; 4. Torsion reinforcement; 5. Second layer of tensile reinforcement; 6. Outer sheath. DETAILED DESCRIPTION
[0017] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.
[0018] A sensing optical cable suitable for infrastructure disaster monitoring includes a cable core, the cable core adopts 0.6mm tight-buffered optical fiber, the cable core includes a central optical unit 1, and the central optical unit 1 is provided with an optical fiber. The outside of the cable core is sequentially coated with a compressive reinforcement 2, a first layer of tensile reinforcement 3, a torsional reinforcement 4, a second layer of tensile reinforcement 5 and an outer sheath 6 from the inside to the outside.
[0019] When the optical cable is used for highway disaster monitoring construction, the compressive reinforcement 2 bears the external pressure, the first layer of tensile reinforcement 3 and the second layer of tensile reinforcement 5 also bear the external pressure, and the torsional reinforcement 4 bears the external torque to ensure that the central optical unit 1 does not break when being dragged, crushed, or twisted; the second layer of tensile reinforcement 5 is separated from the compressive reinforcement 2 by the torsional reinforcement 4, and when the force generated by the deformation of the roadbed and bridge during operation causes the optical cable to stretch, it is ensured that the compressive reinforcement 2 does not cut the second layer of tensile reinforcement 5 when stretched, thereby meeting the highway bridge and roadbed disaster monitoring requirement of "the optical cable does not break under normal operating conditions"; the outer sheath 6 can ensure that the optical cable will not break under high temperature road operating temperatures.
[0020] As a possible implementation mode of the present scheme, preferably, the compressive reinforcement member 2 is a spiral steel belt, and the material of the compressive reinforcement member 2 is SUS204. The spiral steel belt can provide strong pressure resistance but does not have tensile resistance, thereby distinguishing the interfaces of the compressive and tensile reinforcement members, which is beneficial to the subsequent research and development of optical cables with different tensile performance requirements.
[0021] As a possible implementation of the present solution, preferably, both the first layer of tensile reinforcement 3 and the second layer of tensile reinforcement 5 are aramid fibers.
[0022] The first layer of tensile reinforcement 3 provides partial tensile resistance, and at the same time partially isolates the compressive reinforcement 2 from the torsional reinforcement 4, reducing the cutting effect of the compressive reinforcement 2 on the torsional reinforcement 4 when subjected to tension and shear; the second layer of tensile reinforcement 5 provides most of the tensile resistance. When the highway bridge and the roadbed are deformed, the optical cable will be stretched. At this time, the second layer of tensile reinforcement 5 is first subjected to force, and the tension is mainly borne by the second layer of tensile reinforcement 5 and the outer sheath 6, protecting the central optical unit 1 from breaking; when the bridge and the roadbed undergo a disaster, the second layer of tensile reinforcement 5 breaks immediately under the action of a large tensile force, which causes the central optical unit 1 to be subjected to tensile force and break. At this time, the operation management department receives a monitoring signal and issues an alarm.
[0023] As a possible implementation mode of the present scheme, preferably, the torsional reinforcement 4 is a metal woven mesh, and the material of the metal woven mesh is SUS304. The torsional reinforcement 4 can completely isolate the compressive reinforcement 2 from the second layer of tensile reinforcement 5, thereby avoiding the compressive reinforcement 2 from cutting the second layer of tensile reinforcement 5 when being subjected to tension and shear.
[0024] As a possible implementation manner of the present scheme, preferably, the outer sheath 6 is made of low-smoke halogen-free flame retardant material, and the thickness of the outer sheath 6 is ≥0.4 mm. When buried in the road surface, the asphalt material needs to be heated for backfilling. The outer sheath 6 does not melt, deform or crack at a road surface operating temperature of 190°C, thereby ensuring the integrity and durability of the optical cable in the road base layer.
[0025] As a possible implementation manner of the present scheme, preferably, the weight of the optical cable is less than 30kg / km, so that the weight of each 2km long optical cable reel is less than 60kg, and the diameter of the optical cable reel is ≤45cm. When it is laid along the roadbed and bridge, the laying position can be changed without removing the guardrail.
[0026] The present invention is described by preferred embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein, and other embodiments falling within the claims of this application are within the scope of protection of the present invention.
Claims
1. A sensor optical cable suitable for infrastructure disaster monitoring, characterized by: The cable core comprises a central optical unit (1), an optical fiber is arranged in the central optical unit (1), and the outside of the cable core is covered with a compressive reinforcement member (2), a first layer of tensile reinforcement member (3), a torsional reinforcement member (4), a second layer of tensile reinforcement member (5), and an outer sheath (6) in sequence from the inside to the outside.
2. A sensor optical cable suitable for infrastructure disaster monitoring according to claim 1, characterized in that: The compression reinforcement member (2) is a spiral steel belt, and the material of the compression reinforcement member (2) is SUS204.
3. The optical sensing cable suitable for infrastructure disaster monitoring according to claim 1, characterized in that: The first layer of tensile reinforcement (3) and the second layer of tensile reinforcement (5) are both aramid fibers.
4. The optical sensing cable suitable for infrastructure disaster monitoring according to claim 1, characterized in that: The torsion-resistant reinforcement member (4) is a metal braided mesh, and the material of the metal braided mesh is SUS304.
5. The optical sensing cable suitable for infrastructure disaster monitoring according to claim 1, characterized in that: The cable core adopts 0.6mm tight-packed optical fiber.
6. The optical sensing cable suitable for infrastructure disaster monitoring according to claim 1, characterized in that: The outer sheath (6) is made of low-smoke halogen-free flame-retardant material, and the thickness of the outer sheath (6) is ≥ 0.4 mm.
7. The optical sensing cable suitable for infrastructure disaster monitoring according to claim 1, characterized in that: The optical cable weighs less than 30 kg / km.