Directly buried optical cable laying process

Direct buried optical cable is a communication optical cable laying method. This kind of optical cable is armored with steel strips or steel wires on the outside and is directly buried underground. It is required to resist external mechanical damage and prevent 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 pulling and laying.

  2. When laying optical cables with mechanical traction, pulleys should be installed along the line to prevent the optical cable from dragging the floor. The optical cable should not be bent less than the specified radius of curvature or be pulled too tightly.

  3. When manually lifting and laying optical cables, necessary training should be carried out for the lifting personnel. There should be unified command and dispatch during lifting to ensure that the optical cables are evenly stressed and in the same direction to ensure that the entire optical cable is safely lifted to the edge of the ditch and then segmented segment by segment. Place in the bottom of the trench. When lifting and placing the optical cable, the cable must not be twisted or bent. The optical cable must be placed flat on the bottom of the ditch and must not be vacated or arched.

4. The outer sheath of the optical cable should be checked in time during or after the laying process. If it is damaged, it should be repaired immediately. After laying the directly 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 metal sheath of the optical cable should be tested for ground insulation in accordance with regulations and requirements, and insulation obstacles should be dealt with in a timely manner.

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

7. Directly buried optical cables must be inspected and confirmed to meet the quality acceptance standards before they can be backfilled with soil. The backfill soil of the optical cable trench should be backfilled with 15 cm thick crushed soil or fine soil, which should be leveled manually. It is strictly prohibited to push stones, bricks, etc. into the trench. The backfill should be 10 cm above the ground.

  8. Directly buried optical cable joints should be arranged in higher, flatter and geologically stable places, and should avoid places such as ponds, rivers, ditches, roads and other places where construction and maintenance are inconvenient, or where the joints may be disturbed. The optical cable connector pit is generally located on the right side of the forward direction of the optical cable routing; the depth of the connector pit should generally meet the optical cable burial depth requirements; a cement cover or other protective measures against mechanical damage can be used above the optical cable connector box. A disk of no less than 4m should be reserved for the optical cable connector, and the disk should be kept neatly; the lead-out positions of the monitoring cables should be as consistent as possible.