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ADSS cable construction requirements

Return News ListNews source:Mecable News release date 2015-09-21 15:53 Hits:-

1, the cable structure and craftsmanship

 

As we all know, the cable structure design, directly related to the performance of fiber optic cable and cable construction costs.Reasonable structure design will benefit in two aspects. To reach the best performance and cost structure to is our common goal. Generally ADSS cable can be divided into two types,stranded loose tube and the center loose tube.Stranded ADSS is characterized by having a central strength member FRP, it is mainly the central supporting role, and some people call the center anti-fold rod, while loose tube can’t do.

 

For center FRP size, relatively speaking, is better comes in large, but consider the cost, not the bigger the better,but have to depend. For generally stranded structure, generally adopt 1 + 6 structure,Under the circumstance of small number of cores,1 + 5 structure adopted. Theoretically speaking, in the case of the structure to meet the core number, using the structure of 1 + 5, and the cost will be lower, but the case of the same diameter, only 1 + 6 structure 70% more of the diameter of FRP, but the cable will be softer in producing and cable bending strength is worse. it will increase the difficulty during the construction. If the structure 1 + 6, in the case of not increasing the cable diameter, it is necessary to reduce the diameter, which in turn will bring the process difficult, because there is enough to keep the cable length than necessary is not a small diameter therefore, the value must be moderate. Based on the test results of different process structure comparative analysis of samples, such as the use of tubes φ2.2, 1 + 5 structure, and the use of φ2.0 tube, similar to the cost of 1 + 6 structure, but this structure 1 + 6 central FRP relatively coarse, will increase the rigidity of the cable, so cable performance more reliable, stronger security, better rounded in structure.

 

The choice of selecting the structure and the number of fiber cores, that depends on the level of technology of each companies. A large number of cores usually best to use a large span Stranded, this structure can be made relatively longer than bigger, currently the main structure, the trunk using the most appropriate. ADSS fiber optic cable to the central tube, relatively low cost structure, an economic structure, the outer diameter of the cable is relatively small, the weight is also light, but also help reduce the wind load and ice load. However, due to the lack of anti-fold center rod, cable will become more flexible, especially when installing fittings, must pay attention to methods of operation, otherwise it will damage the cable. Here to remind you that the production of such central tube ADSS cable, be sure to pay attention to control the production process production, one more than long, the second is the cable jacket craft. Under normal circumstances, such a structure in a small cross or small carrying capacity conditions, is an economical and practical choice. Cable count can do to 48core, from fiber to finished product complete one time. Rural power grids construction is the best choice.

 

 

 

2, the construction way

The right way to laying ADSS cable is adopt the tension distribution way, but some use manual work due to the lack of special construction equipment, which enlarge the risk of construction. because many people, due to the uneven force will so that the cable without constant tension conditions laying, cable strain local force inconsistent, excessive length change is not the same, for the cable will bring long-term risks. If it is manual laying must pay attention to the force of uniformity. The biggest advantage of mechanical discharge line is constant tension, the cable should always be variable within a stable range. And the control of tension,different cable  takes different off tension to ensure the construction quality to meet the design requirements. Picture 2 is a conventional process schematic on construction equipment.

 

Wherein the tractor has wheel traction type and coil type, usually when all-wheel traction. Requirements traction sheave, the traction sheave minimum outer diameter should be at least 70 times the cable diameter or more, the traction sheave grooves recommendations should be elastic rubber layer as a buffer, to avoid scratching the optical cable. In the course of the discharge line, traction and braking systems should be smooth operation, to prevent the cable caused by any sudden pull or impact, these systems should be adjusted at any time and can stably maintain a fixed tension and put the line speed, tension machine and put on-line, there should be tension display and limiting device, tension machine and cable distribution machine in accordance with the requirements and the installation of fiber optic cable weight and span to determine, on the tension machine tugboat braking device should enable cable can maintain a specific tension in a variety of towing speed, tension machine and cable distribution machine should have a flexible mechanism so that when the brake release line suspended on the cable tension remains unchanged, it is better adopt the automatic protection type apparatus.

 

The diameter of the pulley also required, usually requires 40 times the cable diameter or more of these. The minimum radius of the pulley groove should not be less than 55% cable diameter, depth of not more than 25% of the cable diameter.

 

In some constructions, we also discovered some improper tight line way and tight line device caused damaged on cable. The purpose is to carry on the cable tight line sag and tension adjustment, not because the cause of damage to the tight line cable, requires tight line can withstand the tension of the cable should be greater than the maximum traction tension. When installing fittings,also very likely to cause damage to the cable.

 

Therefore, when you install the fittings, particularly pre-twisted wire type fittings, be sure to use preformed special installation fittings, prohibit the use of a screwdriver or similar tool. Due to incorrect operation, some will make a place in the gold fiber break or high loss point occurs, sometimes resulting in the cable surface roughness, combined with end fittings, electrical cable is likely to cause corrosion. This is a very serious problem that have to attract construction workers and supervisors, supervisors are highly attention.

 

Construction of cable laying speed control, is also an important parameter, normal conditions, the decentralization of line speed shall not exceed 30 m / min. It must be supervised at each tower.

Since the ADSS cable is different from the ordinary fiber cable, cable bending performance is not very good, so the construction process to cut against the cable folded, fold phenomenon after the FRP usually are broken, loose tube was off injured, with fiber optic OTDR test have high attenuation areas or high attenuation point, due to the toughness of the material characteristics of the sheath, the sheath surface will not be much of scars. More serious cause FRP burst and damage the fiber loose tube, fiber cut occurs phenomenon.

 

These are due to improper construction caused. As owners and cable manufacturers, we must strengthen the construction site supervision and monitoring. At many sites, we found a lot of the construction team, due to the knowledge ADSS cable is not very understanding, lack of experience in the construction ADSS cable, sometimes take construction experience to laying fiber optic cable; some also lack qualifications in this area, the East pulled West Minato several workers, Hoo Nongnong; some equipment is not complete, indigenous methods, the job is not standardized. Which gave security cable laying risks.

 

Irrational structure design and unregulated jobs, are the root causes of cable anomaly after construction. As fiber optic cable manufacturers, starting first from the structural design, different laying environment, weather conditions, load size, design methods should differ. On the engineering side, as the cable manufacturers, the need to strengthen the supervision of the project, to avoid and prevent abnormal phenomenon.

 

3, The commonly accidents and prevention

 

1, the damage in appearance

 

As some of the cable line is laid in hilly or mountainous, rocks Mountain of Mountain, spine grass green, cable or rocks easily in the friction roads, very easy to scratch, bending, particularly the cable jacket is worn out, the surface is not smooth when using environment due to dust and salt, prone to electrical corrosion, causing great harm to life. It must have to carefully check the preparatory work before hauling

 

2, fiber optics and high-loss point

 

High fiber cut loss point and phenomena are due to local stress in the construction process due to the discharge line, in the process of laying fiber optic cable jump wheel, speed is uneven, uneven force constant, the corner guide pulley diameter, as well as cable circle phenomenon, can cause sometimes find the center of FRP break, since the center of FRP is non-metallic materials, fiber optic cable is stretched and then retracting, disconnect the Department will dislocation, decapitation will kill wound FRP fiber loose casing, as well as injury to the optical fiber, the light causing high loss point, severe cases can occur broken fiber. This phenomenon is more often the fault occurred, many people would think that is the quality of the cable, the fact is that accidents caused by the construction. Therefore, constant tension control is very important during the construction, but also average speed.

 

3, Tension side fiber break

 

Fiber cut fault Tension side is frequently the one of the accidents, often occur in Tension fittings (pre-twisted wire) nearby distance gold with end within one meter, but also from the tower cited under the gold with the back part, the former is often Since the preformed wire fittings when artificially caused by improper operation, which often is not convenient because of the terrain, traction when the angle is too small tight line side, or a short time with the tower (pole) occurred in a small special forces bent radius, so that the force caused by the local cable. Note the direction of traction should be consistent with the direction in cable construction should allow the cable linear force. Since the cable jacket material and force components are having good elastic properties, often by force after a short time the cable sheath surface does not appear visible injuries, and the inside of the fiber optic element has been damaged by the force, Most people would think that this time is the quality of the cable itself, cause problems to determine errors. We hope to give time to deal with such phenomena analysis issues a judgment. Any party to the fiber optic cable construction, the construction side or, owners or, cable manufacturers, neither the hope of accidents, as long as the construction to strengthen prevention, attention to construction methods, attention to every detail, to avoid abnormal phenomenon. Measured on the disc before the construction, construction supervision, everything goes according to procedures to reduce errors.

 

4. Conclusion

 

ADSS optical cable due to its use of the environment and their own characteristics,has a small market share, especially in the use of saline areas, high field strength environments, galvanic corrosion is severe, which is its weakness, but in some other air environment good areas, voltage levels are not too high has its advantages, as the lower price of optical fiber and cable, technology continues to mature and improve, cable performance to be further improved, the structure of the cable and the use of the environment organic combination, to avoid construction irregularities.

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【Paper label】:FTTH cable Micro fiber optic cable ADSS fiber optic cable Mine fiber optic cable Optical Power Composite Cable MPO MTP

【Responsibility editor】:Mecable Copyright By:http://www.mecable.com/Reproduced please indicate the source

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