Construction points of direct buried optical cable

Direct buried optical cable is a way of laying communication optical cables. This kind of optical cable is armored with steel tape or steel wire outside, and is directly buried in the ground. It is required to have the performance of resisting external mechanical damage and preventing soil corrosion.

Direct Buried Optical Cable Laying Process

1. The laying of direct buried optical cables is generally carried out by two methods: manual lifting and laying and mechanical traction laying.

2. When mechanically pulling and laying the optical cable, pulleys should be installed along the line to prevent the optical cable from dragging the ground. The optical cable should not be bent less than the specified radius of curvature or pulled too tightly.

3. When manually lifting and laying optical cables, necessary training should be given to the lifting personnel. There should be a unified command and dispatch when lifting and lowering, so that the optical cables are evenly stressed and in the same direction, so as to ensure that the entire optical cable is safely lifted to the ditch and then section by section. Put it in the bottom of the ditch. When lifting the optical cable, the cable must not be twisted or slightly bent, and the optical cable must be placed flat on the bottom of the ditch without vacating or arching.

4. During or after laying, the sheath of the optical cable should be checked in time. If there is any damage, it should be repaired immediately. After laying the direct buried optical cable, the insulation resistance of the optical cable sheath to the ground should be checked according to relevant requirements.

5. After the optical cable is laid, the ground insulation test should be carried out on the metal sheath of the optical cable according to the regulations and requirements, and the insulation barrier should be dealt with in time.

6. When the optical cable is laid on a slope with a slope greater than 20 degrees and a slope length greater than 30 meters, it should be laid in an "S" shape.

7. The directly buried optical cable must be inspected and confirmed to meet the quality acceptance standards before backfilling. The backfill soil of the optical cable ditch should be backfilled with 15 cm thick broken soil or fine soil, and it should be leveled manually. It is strictly forbidden to push stones, bricks, etc. into the ditch. The backfill should be 10 cm above the ground.

8.The direct-buried optical cable joints should be arranged in places with relatively high terrain, relatively flat and stable geological conditions, and should avoid places where construction and maintenance are inconvenient, such as ponds, canals, ditches, and roads, or where the joints may be disturbed. The optical cable joint pit is generally located on the right side of the forward direction of the optical cable route; the depth of the joint pit should generally meet the requirements for the buried depth of the optical cable; the top of the optical cable joint box can be equipped with a cement cover or other protection measures against mechanical damage. The fiber optic cable connector shall reserve a plate of not less than 4m, and the plate shall be neat; the lead-out positions of the monitoring cables shall be as consistent as possible.