Application of HDPE silicon core tube in optical cable communication lineApplication of HDPE silicon core tube in optical cable communication line
From a global perspective, many developed countries have adopted HDPE silicon core tubes as trunk protection pipelines in the laying of optical cable communication lines. From a large number of practical analyses, it has been found that the channelization of optical communication can not only improve the quality of communication and accelerate construction The speed of the communication can also effectively reduce the chance of damage to the optical fiber communication cable and improve the overall quality of the optical cable communication. HDPE silicon core tubes have unparalleled advantages in the optical cable communication line. This article aims at the HDPE silicon core tubes in The application of the optical cable communication line is analyzed in several aspects.
1 Characteristics of HDPE silicon core tube
At this stage, HDPE silicon core pipes in China's engineering design are made of high-density polyethylene materials, and silicone plastic layers that reduce friction are also applied inside the pipes. This material has good environmental practicability and scope of application. Extensive, at the same time, it is helpful for construction and laying, with low cost and long service life. Has very prominent advantages and characteristics:
1.1 HDPE silicon core tube is coated with a friction-reducing coating inside, so the inner wall is relatively smooth and the coating will not fall off. It is very easy for the optical cable to enter the pipeline or extract it from the pipeline.
1.2 The radius of curvature of HDPE silicon core tube is greatly reduced compared with the traditional pipe, so that during the laying process, this pipe can be easily matched with the actual environment once it encounters a bent place or a place with a large drop , Does not require any special treatment, the construction is very convenient and the work efficiency is very high.
1.3 The length of each HDPE silicon core tube can be made into any length. Under normal circumstances, transportation safety and construction blow-off technology are the preliminary problems of construction needs. In order to meet the requirements of these aspects, this pipeline has a uniform length, generally 2000 or 3000m.
1.4 The background color and color bar of HDPE silicon core tube can be adjusted arbitrarily according to the needs of the project. Generally, in order to increase the oxidation resistance of the pipeline, the black color bar is the best choice. This kind of pipe can significantly prolong the service life, and can distinguish between multiple pipes laid in the trench, for example, black background plus white, blue or red, orange and other color bars.
1.5 Convenient construction is the outstanding advantage of this kind of material pipeline, which can reduce the overall cost of the project. At present, China's domestic high-speed communication projects generally place three tubes in a tube, and insert the optical cable inside the sub-tube. The length of the tube is 6m or 8m, and it needs to be set at every 100m apart by hand hole or well. The construction is very cumbersome, but HDPE silicon core tube does not need a large tube outside, as long as it is directly sheathed outside the optical cable, Can meet the construction requirements.
2 The superiority of HDPE silicon core tube in optical cable communication line
2.1 Ensure the communication quality and protect the optical cable from damage. First, prevent mechanical damage. In order to protect the optical cable and enable it to carry out communication operation efficiently and stably, a protective layer with sufficient strength must be added outside the optical cable. This protective layer is the plastic tube used in the construction. The HDPE silicon core tube is used, and the strength is very good. The pipe wall is very thick. After buried in the ground, it can effectively avoid damage to the optical cable inside the pipeline due to ground construction. It can generally resist the pressure and collision caused by vehicle pressure, farmland water conservancy construction and natural disasters, and avoid many economic losses. And communication failure.
2.2 Protection against chemical substances. The pipeline is buried in the ground, the underground environment is complicated, and the general pipeline is easily damaged by corrosion, which will cause the internal optical cable to be destroyed, but the HDPE silicon core tube has good air tightness and anti-corrosion function. The fully enclosed structure used, the internal optical cable will not Contact with acids, salts, alkalis and other substances in the soil will not be forced to damage.
2.3 Convenient maintenance and repair, reduce maintenance costs. Since the optical cable is well protected in the plastic pipe without special man-made and natural damage, the pipe is generally not damaged, which can reduce the maintenance workload. The optical cable is left in the well (hand hole). Once the optical cable is damaged or broken, it is not necessary to connect a section of optical cable during emergency repair. Add two optical cable connectors, just use the air blower to blow the residual cable to the obstacle point. To connect, just add a connector. Thereby improving emergency repair efficiency and saving maintenance costs.
3 HDPE silicon core tube construction requirements
3.1 Route selection. 1) Long-distance optical cable pipeline project, according to the conditions of the laying area, priority is given to the construction of the middle green area of the expressway, high-grade roads and general road shoulders, and it can also be built along the road according to the specific conditions of the route routing. When laying, it can be laid within 200m away from the highway. 2) Routing of silicon core plastic pipes for long-distance optical cables. The selection of the long-distance optical cable silicon-core plastic pipeline route should not only meet the requirements of the relevant design specifications, but also meet the following principles according to its characteristics: take into account the needs of the local network and the private network, and choose a relatively flat and geologically stable section. Avoid the mountainous areas with large terrain and follow the existing (or planned) roads. Straight along the road, giving priority to the construction on high-grade highways, long-distance optical cable lines into the city should try to use existing communication pipelines. When a new pipeline needs to be built, it should be coordinated with the construction of the local telephone pipeline. When constructing a plastic pipeline on a highway or in an urban area, the consent of the relevant competent authority for highway or urban construction and planning should be obtained. 3) The choice of the laying location of the silicon core plastic pipe of the long-distance optical cable. Silicon-core plastic pipes should be laid on a more stable route to avoid the influence of road expansion and other buildings, and select ravines with smaller undulations; narrower and shallower rivers; and shallower structures with lower foundations.
3.2 Pipe length requirements. The pipeline should be 2km or 3km. 1) In the smooth section of the road, it is appropriate to use 2km or 3km for the pipeline. A manhole or hand hole is set every 1km or 1.5km, and the pipe directly passes through the middle hand hole. 2) 1km coil-length silicon core tube can be used in mountain rivers and places where transportation or installation is inconvenient, and 2km tube can also be cut at the construction site according to the situation. 3) A hand hole can be added on both sides of the river channel more than 100m wide and the higher point of the hillside, and the silicon core tube can be directly passed through the hand hole (in case of blown cable or pipeline damage in the river channel).
4 Air blowing laying of optical cable
4.1 The basic principle of air blowing method. After the compressed air generated by the cable blowing machine enters the pipeline, fluid power is generated, so that the cable is suspended in the pipeline along with the high-speed airflow, and the thrust of the cable is evenly distributed throughout the cable passing process. Therefore, there will be no difficulty in cable passing due to the bending of the pipeline, no limitation of terrain, and no mechanical damage to the cable.
4.2 The ratio of the outer diameter of the optical cable to the inner diameter of the HDPE silicon core tube. The air blowing method is used to lay the optical cable, and the diameter of the HDPE silicon core tube should be carefully selected. When the other parameters are determined, the diameter of the pipe is proportional to the length of the optical cable, that is, the larger the pipe diameter, the longer the length of the optical cable. But in fact, too large pipe diameter is not only uneconomical, but when the air compressor is at rated air pressure and displacement, too large pipe diameter will reduce the gas pressure in the pipe, which will not necessarily improve the effect of air blowing. On the contrary, the pipe diameter is too small It will increase the friction between the optical cable and the tube wall, and also reduce the air blowing effect. Therefore, the ratio of the inner diameter of the HDPE silicon core tube to the outer diameter of the optical cable is generally not less than 2.
4.3 Air-blowing laying of pipeline optical cable is crucial to the selection of air-blowing point (starting point of laying optical cable). For example: when laying optical cables in mountainous areas, on the premise of satisfying the length of the air blowing, the air blowing point should be selected on the top of the mountain, and the optical cable should be laid down the slope. When blowing and laying the optical cable, the obstacle is passed from the beginning. The obstacle should not appear before the end of the cable laying. It is difficult to pass through the obstacle point after avoiding it.
The construction quality of the communication project directly affects the communication quality. The optical cable adopts the method of pipeline protection during the radiation process to achieve long-term and stable information transmission. Futong Pipe Industry believes that the rise and popularity of HDPE silicon core tubes in recent years has greatly improved The construction quality of China's optical cable project has been effectively reduced, the cost of the project has been effectively reduced, and the development of the communication business has been promoted. Further research on the performance and technical characteristics of HDPE silicon core tubes can better serve the future design and construction of optical cable communication lines.