24 Core Direct Burial Fiber Cable
Loose tube:2.1mm
Central steel wire:2.0mm
Armor: Corrugated steel tape
Sheath: Double PE sheath
Tension:1000/3000N
Crush(N/100mm):1000/3000N
Description
Technical Parameters
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Direct burial armored fiber optic cable stranded multi-tubes metal fiber cable GYTY53
GYTY53 direct burial optical fiber cable, Optical fibers are housed in loose tubes that made of high-modulus plastic and filled with tube filling compound. The tubes (and fillers) are stranded around a central strength member to form a cable core. The core is protected with water blocking tape ,a layer of inner PE sheath and corrugated steel tape. Then another layer outer PE sheath is extruded.
Direct-Buried Optical Cable Introduction
Direct-buried optical cable is a method of laying communication optical cables by directly burying optical cables with specific protective structures underground. This method is widely used in open fields, suburban areas, along urban and rural roads, highways, and railway lines, and is a crucial foundation for building backbone communication networks.
Advantages and Applications
Direct-buried fiber optic cables offer advantages such as good concealment, high security, and immunity to weather conditions, making them particularly suitable for long-distance trunk lines and access networks with low pedestrian and vehicle traffic and relatively stable geological conditions. Although initial construction costs are higher and subsequent maintenance and repair are relatively difficult, their long-term operational stability and anti-interference capabilities make them an important choice for communication infrastructure.
Structural Characteristics and Models
Armor Protection
The outer layer often uses a steel tape or steel wire armor structure. Steel tape armor (e.g., model suffix "53") primarily provides resistance to lateral pressure, preventing crushing by heavy objects; steel wire armor (e.g., model suffix "33") provides stronger tensile strength, suitable for scenarios with significant terrain undulations or requiring long-distance traction.
Protective Performance
It possesses excellent resistance to mechanical damage, soil corrosion, and rodent bites (e.g., rats), while also having good waterproof and moisture-proof properties, ensuring the stability of fiber optic transmission.
Construction and Laying Specifications
The construction quality of directly buried optical cables directly affects the line's lifespan and mainly follows these standards
Buried Depth Requirements
No less than 1.2 meters in ordinary soil; no less than 1.0 meter in semi-rocky areas; no less than 0.8 meters in fully rocky areas; no less than 1.2 meters when crossing railways or highways; no less than 1.0 meter for urban sidewalks.
Trench Bottom Treatment
The trench bottom must be flat and free of gravel. In rocky or semi-rocky areas, a 10 cm thick layer of fine soil or sand must be laid at the trench bottom and above the optical cable as a bedding layer to prevent sharp objects from damaging the cable sheath.
Laying Method
Mechanical traction or manual lifting can be used. On slopes with a gradient greater than 20 degrees and a length greater than 30 meters, an "S"-shaped laying pattern is recommended to allow for expansion and contraction and reduce the impact of gravity-induced slippage. When laying multiple optical cables in the same trench, they must not cross or overlap, and the parallel clearance should not be less than 10 centimeters.
Marking and Maintenance
Marker Installation
Markers must be installed at key locations such as optical cable joints, bends, and reserved areas. Markers are typically white with red lettering, a red marker at the top, and a black arrow indicating direction. They should include the marker number, type, and contact number for maintenance and fault location.
Backfilling Requirements
When backfilling, first cover with a 15-centimeter layer of loose or fine soil and tamp it down manually. It is strictly forbidden to fill with stones, bricks, or frozen soil. The soil should be tamped down every 30 centimeters, and the final backfill should be 10 centimeters above ground level to prevent settlement.
Protective Measures
When crossing railways, busy highways, or areas prone to excavation, steel pipe protection or directional drilling should be used for pipe laying. In areas prone to thunderstorms, metal components at fiber optic cable joints should be electrically disconnected, and lightning protection drain lines or surge protection devices should be installed.
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Technical Characteristics
|
Fiber Count |
12~144 core |
|
Loose Diameters |
2.1mm |
|
Loose Material |
PBT |
|
Central Strength Member |
Steel wire |
|
Water blocking material |
Water blocking tape |
|
Inter Jacket Material |
PE |
|
Armor |
Corrugated steel tape |
|
Outer Jacket Material |
PE |
|
Nominal Outer Dimensions |
11.0~25.0 mm (±0.3) |
|
Tension Strength (Short-Term / Long-Term) |
3000N/1000N |
|
Crush Resistance (Short-Term / Long-Term) |
3,000 N/100mm 1000 N/100mm |
|
Minimum Bend Radius (Static / Dynamic) |
10 x OD / 20 x OD |
*All above the cable size can be customized.
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