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आउटडोर डायरेक्ट बरीड ऑप्टिकल फाइबर केबल क्या है?
परिभाषा
Direct buried optical fiber cable is a communication optical cable laying method. इस तरह के ऑप्टिकल केबल में बाहर की तरफ स्टील टेप या स्टील वायर आर्मर होता है, और सीधे जमीन में गाड़ दिया जाता है. इसके लिए बाहरी यांत्रिक क्षति का विरोध करने और मिट्टी के क्षरण को रोकने के प्रदर्शन की आवश्यकता होती है.
Structure
Normally there are two or more layers of jacket structure to protect the cable core. केंद्र धातु या गैर-धातु सुदृढीकरण सदस्यों का उपयोग करता है, among which non-metallic reinforcement members are suitable for heavy mine areas.
Application Environment
It is suitable for subway, सुरंग, long-distance communication, inter-office communication, outdoor feeder and wiring for access network, आदि.
Laying and installation steps
Buried depth
Because the direct buried optical cable is directly buried under the ground, it must have a certain distance from the ground. With the help of the tension on the ground, the optical cable is not damaged. एक ही समय पर, it should also be ensured that the optical cable is not frozen.
Depending on the soil quality and environment, the depth of the optical cable buried underground is generally between 0.8 meters and 1.2 मीटर की दूरी पर. बिछाते समय, care must also be taken to keep fiber strain within allowable limits.
Cleaning and backfilling of cable trenches.
The bottom of the ditch should be flat and free of debris such as gravel and hard clods that hinder the laying of optical cables. If the trench is stony or semi-stony, 10cm thick fine soil or sand should be laid at the bottom of the ditch and leveled.
After the optical cable is laid, 30cm thick fine soil or sand should be backfilled as the protective layer. It is strictly forbidden to mix gravel, bricks, hard soil blocks, आदि. into the protective soil layer. The protective layer should be gently stepped on manually.
Fiber optic cable laying
When laying optical cables or cables in the same trench, they should be pulled and laid separately at the same time. If it is laid in the same trench as the direct buried cable, the cable should be laid first, and then the optical cable should be laid in parallel at the bottom of the trench.
Just like laying optical cables in trenches, they should be laid separately at the same time, and must not cross or overlap at the bottom of the trenches. The optical cable should be laid flat at the bottom of the trench or bent naturally to release the stress of the optical cable. If it is bent or arched, try to lay it flat, but it is absolutely not allowed to use strong methods such as stepping on it.
To identify where cable locates
Marks should be set up at the joints, turning points, reserved lengths, or intersections with other pipelines of directly buried optical cables for future maintenance. The sign can either use an autocratic sign, or borrow a permanent building near the optical cable, measure the distance between a certain part of the building and the optical cable, and record it for future reference.
Installation Precautions
- 1) Before laying out the optical cable, the construction and related personnel should be properly trained on the matters that should be paid attention to in the construction, such as the essentials of the laying out method and safety, and ensure that the construction personnel obey the command.
- 2) Check whether the specific direction of the optical cable routing, the laying method, the environmental conditions and the specific location of the joint conform to the construction drawing design.
- 3) Check the ground distance and the length of the relay segment.
- 4) Determine the specific location and treatment measures of the section where protective measures need to be taken for optical cables to pass through obstacles.
- 5) Determine the location, location and quantity of optical cable protection such as trenches, sills, slopes, and blockages.
- 6) The minimum distance between optical cables and other facilities, trees, buildings and underground pipelines must meet the acceptance technical standards.
- 7) The route of the optical cable, the laying position and the connection point should be safe and reliable, which is convenient for construction and maintenance.
- 8) Before excavating the cable trench, the construction unit shall lay the gray line along the straight line section of the gray line along the route according to the approved construction drawing design, and there shall be no serpentine bend or disconnection.
- 9) The direct buried optical cable shall be excavated according to the standard requirements.
- 10) जहां खाइयां नहीं खोदी जा सकतीं, पाइपलाइनों को ओवरहेड या ड्रिल किया जा सकता है.
- 11) Due to the heavier weight of the direct-buried optical cable for climbing and the complex terrain, the construction is difficult and requires a lot of labor, so enough personnel should be provided
- 12) The bottom of the ditch should be smooth and firm, और रेत का एक हिस्सा, यदि आवश्यक हो तो सीमेंट या समर्थन पहले से भरा जा सकता है.
- 13) When laying optical cables, engineers and technicians should be equipped with necessary communication equipment, such as walkie-talkie speakers.
- 14) The bending radius of the optical cable should be less than 15 times the outer diameter of the optical cable, and should not be less than 20 times during the construction process.
- 15) बिछाने के दौरान मैनुअल या मैकेनिकल ट्रैक्शन का उपयोग किया जा सकता है, लेकिन मार्गदर्शन और स्नेहन पर ध्यान देना चाहिए.
- 16) During mechanical traction, the progress adjustment range should be 3~15m/min, the adjustment method should be stepless speed regulation, and it should have automatic stop performance. During traction, centralized traction, intermediate auxiliary traction, and decentralized traction should be selected according to factors such as traction length, terrain conditions, and traction tension.
- 17) After the optical cable is laid, the end of the optical cable should be treated with moisture-proof, and should not be soaked in water.
- 18) बिछाने के पूरा होने के बाद, जितनी जल्दी हो सके मिट्टी को ढंकना और जमा करना चाहिए.
